JPH08196309A - Foam slash molded shoe and manufacture thereof - Google Patents

Abstract

PURPOSE: To improve the strength of a part needed to be reinforced and reduce the weight of the above part by providing the shoe main body foamed by thermal expansion of a thermal expansion microcapsule, and making the wall thickness of the part needed to be reinforced of the shoe main body larger than the wall thickness of the other part. CONSTITUTION: The shoe main body 2 of a foam slash molded shoe 1 is formed by a heat gelatinized matter of plastisol containing polyvinyl chloride paste resin and thermal expansion microcapsule put in the foam state by thermal expansion. The shoe main body 2 means a part including the whole part extending from the lower sole part 3 to the upper end wearing port 4, and is composed of the tiptoe part 5, the part 7 needed to be reinforced such as the heel part 6, the sole part 3 and so on, and the other part 8. The shoe main body 2 is forced to preset the foam state by heating a thermal expansion microcapsule contained in plastisol to be thermal-expanded. The wall of the tiptoe part 5, the part 7 needed to be reinforced such as the heel part 6, the sole part 3 and so on is made thicker than that of the other part 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam slush molded shoe in which the whole or a part of a shoe body is foamed, and a method for producing the same.

[0002]

2. Description of the Related Art As shown in FIG. 7, a slush molded shoe made of polyvinyl chloride paste resin is first made into an original model by making an actual shoe using a material such as leather or synthetic leather. A cylindrical slush molded shoe mold 31 having the shape of a shoe has been manufactured by an electroforming method in which the outer surface of the slab is metal-plated, and a polyvinyl chloride paste resin is poured into the slush molded shoe mold 31 thus manufactured. By heating the outer peripheral portion for a short time, a shoe gel-like semi-gelled product made of polyvinyl chloride paste resin is layered on the inner wall surface of the slush molded shoe mold 31, and then the ungelled material in the semi-gelated product is formed. The excess polyvinyl chloride paste resin in the activated state is discharged from the upper end opening 32 by inclining the slush molding shoe mold 31, for example. By heating the body to completely gelate the semi-gelled material in the slush molded shoe mold 31, the toe portion, the heel portion, the bottom portion and the like need to be reinforced, and the other portions such as the shoe mouth portion and the tubular portion are A shoe main body (skin) 33 integrally formed with is manufactured.

After cooling and demolding, as shown in FIG. 8, a heel 35 manufactured in a separate step as an assembly component is attached to the outer heel of the shoe body 33 by, for example, adhesion, and the shoe body 33 is further attached to the shoe. The back cloth (inner boots) sewn from the back cloth material and parts such as the insole and fasteners are assembled by sewing, bonding, etc., and painted to finish the slush molded shoe as the final product.

In the method of manufacturing the slush molded shoe described above, the heel 35 is mounted after the slush molding of the shoe body 33, but in addition to this, as shown in FIG.
In the slush molding step, after the excess polyvinyl chloride paste resin in the ungelled state is discharged to the outside of the slush molding shoe mold 31, the heel paste is injected into the inner heel of the semi-gelated product 33, and There is also a manufacturing method in which the heel gel 34 is integrally formed with the shoe body 33 by heating the entire body to a gelling temperature or higher to gelate the semi-gelated product and the heel paste together.

The slush-molded shoe manufactured in this manner was used on the inner surface of the slush-molded shoe mold because the slush-molded shoe mold manufactured by metal plating the outer surface of the original model was used. The material, stitches, and even the cut-out design are faithfully reproduced to give an excellent design expression, and since the shoe body is a complete tubular body with no seams or seams, it is highly waterproof and moisture-proof. And has been commercialized in large quantities as cold boots such as boots.

By the way, the slush-molded shoe is heavy in weight because it uses a heat-gelled product of polyvinyl chloride paste resin in the shoe body, and the weight reduction is one of the most required requirements for footwear. There was a problem that it was difficult to achieve.

Therefore, various techniques for reducing the weight of slush molded shoes have been proposed so far.

For example, in JP-A-52-76151, plastisol containing polyvinyl chloride paste resin degassed under reduced pressure is poured into a heated slush molded shoe mold to form an inner wall surface of the slush molded shoe mold. After forming a layer of semi-gelated product as an outer layer on top of the plastisol and discharging excess plastisol, plastisol containing mechanically foamed polyvinyl chloride paste resin is injected into and discharged from the inside of the semi-gelled product to create air bubbles. A method of manufacturing a lightweight foamed slush molded shoe having a two-layer structure of a solid outer layer and an inner layer containing air bubbles is proposed by forming an inner layer containing a.

Further, Japanese Patent Laid-Open No. 6-217801 discloses a vinyl chloride paste resin blended in an appropriate amount and a crosslinkable copolymer of a nitrile monomer and a methacrylic acid ester or an acrylic acid ester or an acrylic acid ester. A plastisol containing heat-expandable microcapsules is injected into a slush molding shoe mold, discharged and heated below the expansion temperature of the microcapsules to form a semi-gelling layer on the inner wall surface of the slush molding shoe mold. Then, after discharging the surplus plastisol, a method of manufacturing a foamed slush molded shoe in which each part of the shoe main body uniformly contains bubbles by heating and cross-linking the semi-gelled layer to a temperature above the expansion temperature of the microcapsules has been proposed. There is.

[0010]

According to these conventional techniques, the foamed slush molded shoe contains air bubbles almost uniformly over the entire surface of the shoe body, so that the shoe body is lighter than the slush molded shoe having no air bubble in the shoe body. Can be realized.

However, in these conventional techniques, the reinforcement-requiring portions of the shoe body, such as the toe portion, the heel portion, and the bottom portion, which require the strength are inevitably and unavoidably foamed, and therefore the reinforcement-requiring portions are also included. Since air bubbles are included and the physical properties deteriorate, it is not possible to satisfy the required physical properties such as strength and wear resistance while reducing the weight.

It seems that it is easy to improve and secure the strength by increasing the wall thickness of the portion requiring reinforcement if a slight increase in weight is allowed. ， When the heating temperature is increased to thicken the part requiring reinforcement of the semi-gelated product and slush molding is performed, the reinforcement required part is thicker than other parts due to the increased thickness during heat gelation foaming. It is necessary to apply the heat of. When a large amount of heat is applied to the reinforcement-needed portion to achieve heat gelation, the heat-gelling causes excessive foaming of the reinforcement-needed portion and rough skin. Will end up.

In addition to shoes, slush molding techniques for dolls and interior materials for automobiles are also known, but these have a foaming ratio of more than 500%, and when these are to be applied to shoes, The strength required for shoes cannot be maintained.

The present invention has been made in order to solve the problems of the prior art, and the toe portion, the heel portion, the bottom portion and the like of the shoe body have a sufficient strength. An object of the present invention is to provide a foamed slush molded shoe that has a function as a shoe and is lightweight, and a manufacturing method thereof.

[0015]

[Means for Solving the Problems] The inventors of the present invention have made extensive studies to solve the above problems, and made a polyvinyl chloride forming a shoe main body from a thermally expandable microcapsule having a foaming condition by a certain specific thermal expansion. When the slush molding is performed by incorporating it into a plastisol containing paste resin, heating conditions for appropriately gelling the semi-gelled product formed on the inner wall surface of the slush molding shoe mold, and the above-mentioned thermally expandable microcapsules It has been found that a difference can be caused between the heating conditions in which the shoe body is heated and expanded to cause the shoe body to expand and foam.

That is, in the usual case, the gelling temperature of the polyvinyl chloride paste resin forming the shoe body is about 160.degree. Therefore, for example, hydrocarbons such as butane, tetramethylmethane, or isopentane are included, and the temperature is higher by several tens of degrees Celsius than the gelling temperature (for example, about 190 degrees Celsius, which is not the temperature at which thermal expansion is started, but sufficient thermal expansion). This means the temperature at which the state is exhibited, that is, the softening temperature of the grain wall, for example, 140 ° C. or higher causes a slight amount of thermal expansion, but a sufficient thermal expansion state cannot be obtained even if heating is continued for a long time.
In the following specification, the temperature at which a sufficient thermal expansion state is exhibited will be referred to as "thermal expansion temperature" for convenience. ), The heat-expandable microcapsules that expand properly and expand into the polyvinyl chloride paste resin that makes up the shoe body are mixed in an appropriate amount. For example, if the semi-gelled product is heated to 160 to 180 ° C., it is possible to cause the thermal expansion of the thermally expandable microcapsule without causing foaming or to allow the gelation to proceed appropriately within a range of a slight amount of thermal expansion. On the other hand, if the temperature is equal to or higher than the foaming temperature due to thermal expansion, for example, 190 ° C. or higher, the gelation naturally proceeds, and the thermally expandable microcapsules thermally expand even in a relatively short time to foam the shoe body. be able to. Thus, the foaming of the heat-expandable microcapsules due to the thermal expansion is completed in a relatively short time, but if the heating is further increased, the cells collapse relatively early and the expansion ratio decreases. Since gelation of polyvinyl chloride paste resin proceeds slowly over a relatively long period of time, for example, by heating to a high temperature range above the thermal expansion temperature, gelation of the shoe body and thermal expansion of the thermally expandable microcapsules occur. If foaming is attempted at the same time, even if the heat-expandable microcapsules reach a foamed state due to appropriate thermal expansion, gelation of the shoe body is insufficient and physical properties such as strength are insufficient. Further, if the heating is increased, the cells collapse and the expansion ratio decreases. Therefore, by pre-heating and supplementing the insufficient amount of gelation to a gelling temperature range where foaming due to thermal expansion of the microcapsules does not occur, proper foaming due to thermal expansion can be performed without causing insufficient gelation. It can be carried out. Further, while microcapsules can obtain fine and good cells, the foaming state is unstable, and the cells tend to collapse relatively early due to heating and the expansion ratio tends to decrease, so the foaming agent decomposition temperature is around 200 ° C. For example, azo series, nitroso series,
By using a foaming agent such as hydrazine, it is possible to suppress the cost increase due to only microcapsules, and the microcapsules provide fine and good cells and a foaming agent to stabilize the foaming state, and the expansion ratio of the shoe body after thermal expansion. Can be further stabilized, and the adaptability as a foam slush molded shoe, which is particularly required to be mass-produced, can be further improved. When a foaming agent is used in combination, it is also possible to adjust the temperature rate of the foaming agent by a stabilizer, a foaming accelerator and a foaming inhibitor in the compounding. Further, it is possible to suppress foaming of the shoe main body facing the heel core or the shoe sole and reinforce the strength thereof by using the foaming inhibitor in the heel paste or the plastisol for the shoe sole.

The inventors of the present invention have conducted further studies based on these findings or findings, and first of all, heat the semi-gelled material having a different wall thickness at each site to the gelling temperature range to advance the gelation, The present invention was completed by finding that it is possible to perform foaming by thermal expansion of a desired foaming ratio for each site by partially controlling the heating temperature and the heating time thereafter.

The foamed slush molded shoe according to the first aspect of the present invention is a foamed slush molded shoe having a shoe body composed of a heat-gelated substance of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules. The shoe body is foamed by the thermal expansion of the heat-expandable microcapsules, and the toe part of the shoe body,
It is characterized in that the wall thickness of the reinforcement-requiring portion such as the heel portion and the bottom portion is made larger than the wall thickness of the other portion of the shoe body excluding the reinforcement-requiring portion.

A foam slush molded shoe according to a second aspect of the present invention is the foam slush molded shoe according to the first aspect, wherein all or a part of the reinforcement-needed portion has a smaller expansion ratio than the other parts. It is characterized by that.

A foam slush molded shoe according to a third aspect of the present invention is the foam slush molded shoe according to the first or second aspect, wherein the shoe body is a heel paste in which the shoe body is injected into the inner heel portion in the slush molding step. In addition to the heel core made of the heat-gelled product, the foaming ratio of the bottom surface of the heel portion of the reinforcement-needed portion is smaller than the foaming ratio of each of the toe portion and the bottom portion.

A foam slush molded shoe according to a fourth aspect of the present invention is the foam slush molded shoe according to any one of the first to third aspects, in which all or part of the outer surface of the shoe body is non-foamed. Alternatively, the invention is characterized in that a skin skin layer made of a heat-gelled thin film of plastisol containing a low-foaming polyvinyl chloride paste resin is formed.

A foam slush molded shoe according to a fifth aspect of the present invention is the foam slush molded shoe according to any one of the first to third aspects, wherein all or part of the outer surface of the bottom surface of the shoe body is A shoe sole made of a heated gel of plastisol containing non-foamed or low-foamed polyvinyl chloride paste resin is formed, and the thickness of the toe and heel of the necessary reinforcement portion is greater than the thickness of the bottom. It is characterized by being done.

A foam slush molded shoe according to a sixth aspect of the present invention is the foam slush molded shoe according to the fourth aspect, wherein the outer surface of the bottom surface of the outer skin layer or the bottom surface between the shoe body and the outer skin layer is formed. All or part of the shoe bottom is made of a heat-gelated plastisol containing non-foamed or low-foamed polyvinyl chloride paste resin, and the toe and heel parts of the necessary reinforcement part have a bottom thickness. It is characterized in that it is made thicker than the wall thickness of.

The foamed slush molded shoe according to claim 7 of the present invention is the foamed slush molded shoe according to any one of claims 1 to 6, wherein the plastisol constituting the shoe body contains a foaming agent. It is a feature.

In the method for manufacturing a foamed slush molded shoe according to claim 8 of the present invention, the shoe body is constituted by a heated gelation product of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules. Is foamed by thermal expansion, and the wall thickness of the reinforcement-requiring portion of the shoe body is made larger than the wall thickness of the other portion of the shoe body. A plastisol containing a resin and at least a thermally expandable microcapsule exhibiting an expanded state at a temperature higher than the gelation temperature is injected into a slush molded shoe mold to a height required as a shoe body of the slush molded shoe. Required to reinforce the toe, heel and bottom of the toe, and other parts other than the necessary reinforcement By heating Chigae conditions,
A shoe-gel-like semi-gelled material in which the wall thickness of the reinforcement-requiring portion is larger than the wall thicknesses of the other portions is layered on the inner wall surface of the slush-molding shoe mold, and remains on the inner surface of the half-gelated material. The first step of discharging the plastisol in an ungelled state, and the semi-gelled product formed in the first step are brought to a temperature range not lower than the gelling temperature and lower than the foaming temperature due to the thermal expansion required by the microcapsules. After heating to progress gelation, the microcapsules are heated to a temperature range not less than the required foaming temperature due to thermal expansion to foam the microcapsules by thermal expansion to form a gelled plastisol constituting the shoe body. And a second step of foaming.

According to a ninth aspect of the present invention, in the method for producing a foam slush molded shoe according to the eighth aspect, the semi-gelled product formed in the first step in the second step of the method for producing a foam slush molded shoe according to the eighth aspect is used. , After the gelation progresses by heating to a temperature range that is higher than the gelation temperature and lower than the thermal expansion temperature, heat the required reinforcement portion below the thermal expansion temperature or above the thermal expansion temperature for a short time, and By heating to a temperature range higher than the thermal expansion temperature to cause foaming, it is composed of a heat-gelated substance of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules, and the expansion ratio of all or a part of the necessary reinforcement portion. Is foamed to a smaller extent than the foaming ratio of the other parts, and the thickness of the reinforcement-needed portion is increased to be larger than that of the other parts. The one in which the features.

According to a tenth aspect of the present invention, the method for producing a foam slush molded shoe according to the eighth aspect is the second step of the method for producing a foam slush molded shoe according to the eighth or ninth aspect.
Before the semi-gelated product formed in the first step is heated to a temperature range higher than the gelation temperature and lower than the thermal expansion temperature to proceed with gelation, a heel paste is applied to the inner heel of the semi-gelated product. By injecting, the shoe body formed in the second step is provided with a heel core made of a heat-gelled product of the heel paste on the inner heel portion and foaming of the bottom surface of the heel portion of the reinforcement required portion. The expansion ratio is smaller than the expansion ratio of each of the toe part and the bottom part.

According to the eleventh aspect of the present invention, the method for producing a foam slush molded shoe is the first aspect of the method for producing a foam slush molded shoe according to any one of the eighth to tenth aspects.
Before the process, plastisol containing polyvinyl chloride paste resin is poured into the slush molded shoe mold to the height required for the body of the slush molded shoe, or to the height including the necessary reinforcement portion, and the shoe is heated. By forming a layer of the main body thin film semi-gelated product on the inner wall surface or the lower part of the inner wall surface of the slush molding shoe mold, and discharging the ungelled plastisol remaining on the inner surface of the semi-gelated product, On the whole or a part of the outer surface of the shoe body formed in the second step, a skin skin layer made of a heat-gelated thin film of plastisol containing a non-foamed or low-foamed polyvinyl chloride paste resin is formed. It is a feature.

A method for manufacturing a foam slush molded shoe according to a twelfth aspect of the present invention is the first method for manufacturing a foam slush molded shoe according to any one of claims 8 to 10.
Prior to the process, plastisol containing polyvinyl chloride paste resin is poured onto all or part of the inner bottom of the slush molded shoe mold to heat it to all or part of the inner bottom of the slush molded shoe mold. A plastisol containing a non-foamed or low-foamed polyvinyl chloride paste resin on all or part of the outer surface of the bottom surface of the shoe body formed in the second step by forming a layer of a bottom semi-gelated product. In addition to forming a shoe sole made of the heat-gelled product, the wall thickness of the toe part and the heel part of the reinforcement-required part is made larger than the wall thickness of the bottom part.

A method for producing a foam slush molded shoe according to a thirteenth aspect of the present invention is a plastisol forming a skin skin layer before the first step of the method for producing a foam slush molded shoe according to the eleventh aspect. Plastisol containing polyvinyl chloride paste resin before injection, or after discharging the plastisol in the non-gelled state after forming the semi-gelled product that forms the skin layer of the skin, the slush molding shoe inner part or the inner bottom of the semi-gelated product All or part of the outer surface of the bottom surface of the epidermis skin layer, or the main body of the shoe, by injecting and heating all or part of the Formed on all or part of the bottom surface between the skin layer and the skin layer is a plastisol heated gel product containing non-foamed or low-foamed polyvinyl chloride paste resin. With the wall thickness of the toe portion and the heel portion of the reinforcement required portion is characterized in that formed by increased than the thickness of the bottom.

A method for manufacturing a foam slush molded shoe according to a fourteenth aspect of the present invention is the method for manufacturing a foam slush molded shoe according to any one of the eighth to thirteenth aspects, wherein the plastisol forming the shoe body is It is characterized by containing a foaming agent.

[0032]

First, the foamed slush molded shoe according to the present invention will be described in detail with reference to the attached drawings together with the operation and effect.

(1) Foam Slush Molding Shoe According to Claim 1 FIG. 1 is a longitudinal sectional view showing the structure of the foam slush molding shoe according to claim 1.

In this foamed slush molded shoe 1, a shoe body 2 is made of a heat-gelated substance of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules that are thermally expanded into a foamed state.

As the polyvinyl chloride paste resin, a vinyl chloride monomer is generally obtained by a polymerization method such as emulsion polymerization or microsuspension, or a copolymer of vinyl chloride and vinyl acetate, vinylidene chloride, ethylene, propylene or the like. And a resin having a hydroxyl group (-OH) or a carboxyl group (-COOH) in the molecule and having crosslinkability, such as a polyvinyl chloride paste resin, can be used, and a paste resin having a polymerization degree of about 1000 to 2000 can be used. It is illustrated.

The heat-expandable microcapsules contain hydrocarbons that expand by heat at a temperature higher than the gelation temperature of the plastisol described above and foam. The hydrocarbons include butane, tetramethylmethane, isopentane, Normal pentane, trimethylethyl methane, dimethyl isopropyl methane, dimethyl propyl methane, methyl diethyl methane, normal hexane, 2,2-dimethyl pentane, 2,4-dimethyl pentane, 2,2,3-trimethyl butane, 3,3-dimethyl Examples include pentane, 2,3-dimethylpentane, 2-methylhexane, 3-methylhexane, 3-ethylpentane, normal heptane, normal octane and isomers thereof.

As the shell wall of the microcapsule,
Vinylidene chloride, acrylonitrile, copolymers of acrylonitrile and vinylidene chloride, copolymers of nitrile resins such as acrylonitrile and methacrylonitrile with methacrylates such as methyl methacrylate and ethyl methacrylate, nitrile resins and methyl acrylate and ethyl Examples thereof include copolymers with acrylic acid esters such as acrylates.

The plastisol constituting the shoe body of the foamed slush molded shoe according to the present invention contains the heat-expandable microcapsules containing the above-mentioned hydrocarbons, and is heated to a temperature lower than the gelation temperature of the plastisol. The shell wall softens and the hydrocarbon gasifies and thermally expands to foam. However, in the present invention, the foaming temperature due to thermal expansion that exhibits a foamed state due to appropriate thermal expansion is a gelling temperature (usually about 16
Although it is 0 ° C., it has a range of about 10 to 15 ° C. depending on the compounding, and for example, when the plasticizer content is increased, it is slightly lower than 160 ° C. ) Use the above microcapsules.

The foamed cells obtained by thermally expanding the thermally expandable microcapsules are determined by the size of the grain wall of the thermally expandable microcapsules, and the cells can be made finer than the foaming by the foaming agent. However, in some cases, the stability of the cells after thermal expansion is inferior to that of the foaming agent, and if the heating conditions are excessive, the gasified hydrocarbons escape from the grain wall, and the cells collapse and the expansion ratio is reversed. Since it may be lowered or the surface may be roughened, as will be described later, it is desirable to contain a foaming agent together with the thermally expandable microcapsules in order to obtain a more stable foaming state.

Since this plastisol usually contains a plasticizer, a stabilizer and a pigment in addition to the polyvinyl chloride paste resin and the foaming agent, they will also be described.

As the plasticizer, DOP, DIDP, DH
Examples include various plasticizers such as phthalic acid ester-based compounds such as P and DBP, adipic acid ester-based compounds, polyester-based compounds, and epoxy-based compounds.

Examples of the stabilizer include organic tin-based stabilizers such as dibutyltin dilaurate and dibutyltin malate, tin mercapto-based, Ba-based, Zn-based, Ca-based and composites thereof. In addition, in the present invention, since it is used by being contained in a plastisol together with a foaming agent, depending on the kind of the metal element used for the stabilizer, it affects the foaming agent decomposition temperature and foamability in addition to the heat stability which is the original purpose of use. Therefore, care must be taken when selecting the metal element used as the stabilizer. Specifically, tin or Ba suppresses foaming, and Zn, P
Since b, Cd, etc. accelerate foaming and lower the decomposition temperature of the foaming agent, it is desirable to use a composite stabilizer mainly composed of Zn and mixed with other stabilizers.

The pigment is selected according to the color given to the shoe body, and examples thereof include inorganic pigments such as titanium oxide, red iron oxide, carbon black, and watching red, phthalocyanine, and azo organic pigments.

The composition of the plastisol containing these is
Thermally expandable microcapsules: 1 to 10 parts by weight, plasticizer: 8 to 100 parts by weight of polyvinyl chloride paste resin
0-100 parts by weight, stabilizer: 3-5 parts by weight, pigment: 1-
3 parts by weight.

The shoe body 2 is composed of the heat-gelated plastisol having such a composition. Here, the shoe main body 2 means a portion including all from the bottom portion 3 at the lower portion to the mouth opening portion 4 at the upper portion, in other words, the toe portion 5, the heel portion 6 (rear surface 6a and bottom surface 6b) and the bottom portion. Reinforcement required part 7 such as 3
And the other portion 8 excluding this reinforcement required portion 7 is the entire portion. It should be noted that the toe portion 5 means at least a portion including a hood covering from the tip of the shoe main body to a line connecting the center points of the shin side to the calf side, and may further include a hood covering portion of the instep portion. The heel portion 6 means a portion including at least the heel point, and may further include an Achilles tendon equivalent portion or the like. Further, the bottom portion 3 means a portion including at least the entire area of the ground contact surface side, and may include a bottom peripheral edge rising from the ground contact surface. Further, the heel portion 6 also includes a heel portion having a stepped portion on the bottom surface for retrofitting a heel lift or a fitting spike for improving comfort and wear resistance.

The shoe body 2 is in a foamed state when the heat-expandable microcapsules contained in plastisol are heated and thermally expanded. Foaming is performed substantially uniformly on all parts of the shoe body 2. That is, there is no great difference in the degree of foaming between the above-mentioned reinforcement-needed portion 7 and the other portion 8, and they are foamed to a substantially uniform degree.

Further, the thickness of the toe portion 5, the heel portion 6 and the bottom portion 3 of the shoe body 2 which need to be reinforced is determined by the thickness of the shoe body 2.
The thickness of the other portion 8 excluding the reinforcement necessary portion 7 is increased. That is, in the foamed slush molded shoe 1 according to claim 1, the shoe body 2 is foamed substantially uniformly regardless of the parts, and the overall weight is reduced, and the thickness of the reinforcement-required portion 7 of the shoe body 2 is large. Therefore, the required strength is maintained.

In order to make the thickness of the reinforcement-requiring portion 7 larger than that of the other portions, as will be described in detail in the description of the method for manufacturing the foamed slush molded shoe according to the present invention of claim 8, In the semi-gelling step in the slush molding step, heating conditions (one or both of heating temperature and heating time) are changed within a specific range between the portion that becomes the reinforcement necessary portion 7 and the portion that becomes the other portion 8. .

(2) Foam slush molded shoe according to claim 2 In the foam slush molded shoe according to claim 1, the foam slush molded shoe according to claim 1 has a foaming ratio of all or a part of the reinforcement required portion 7 other than the above. It is smaller than the expansion ratio of the portion 8. That is, since at least a part of the reinforcement-requiring portion 7 such as the toe portion 5, the heel portion 6 and the bottom portion 3 has a larger wall thickness and a smaller foaming ratio than the other portion 8, the strength is high. The shoe body 2 has a structure that is remarkably increased in number and has the required functions.

In the foamed slush molded shoe according to claim 1 or 2, the expansion ratio showing the degree of foaming is calculated by (wall thickness after foaming) / (wall thickness before foaming) × 100 (%). However, if the foaming ratio of the shoe main body 2 exceeds 200%, the weight reduction effect increases, but the strength of the shoe main body 2 significantly decreases, and the strength required for the foam slush molded shoe 1 may not be maintained. Therefore, the shoe body 2
It is desirable that the foaming ratio of is not more than 200%. It is not necessary to set the lower limit of the expansion ratio from the viewpoint of ensuring the strength required by the shoe main body 2, but the weight reduction effect decreases as the expansion ratio decreases, so the value should not be extremely low. desirable. From this point of view, it is most desirable that the expansion ratio is, for example, 105% or more and 140% or less.

(3) Foam slush molded shoe according to claim 3 FIG. 2 is a longitudinal sectional view showing the structure of the foam slush molded shoe according to claim 3.

A foam slush molded shoe 1'according to claim 3 shown in Fig. 2 is the same as the foam slush molded shoe 1 described in claim 1 or claim 2, except that the shoe body 2 is slush molded in the inner heel portion. A heel core 9 made of a heated gel of the injected heel paste is provided.

The heel core 9 is injected into the bottom of the inner surface of the semi-gelated material to be the shoe body 2 in the heat gelation step of the shoe body 2 (the second step of the manufacturing method according to claim 8 described later). It is a gelled product of a paste for heating.

The composition of this heel paste is the hardness after gelling by heating, the rate of change in volume due to heating, and the shoe body 2
It may be appropriately determined in consideration of the adhesion strength with the like and is not limited to a specific type. As an example, with respect to 100 parts by weight of polyvinyl chloride paste resin, plasticizer: 70 parts by weight, thermosetting plasticizer: 20 parts by weight, catalyst: 0.2 parts by weight, stabilizer: 1 part by weight, pigment: 1 A weight part can be illustrated. Here, since the polyvinyl chloride paste resin, the plasticizer, the stabilizer, and the pigment are the same as those contained in the plastisol constituting the shoe body 2, the description thereof is omitted here, and the thermosetting property is omitted. The plasticizer and catalyst will be described.

The thermosetting plasticizers used in the heel paste are exemplified below. Allyl ester type thermosetting plasticizers: diallyl phthalate, allyl acrylate, triallyl theerate, diallyl maleate, dichloroallyl maleate, diallyl itaconic acid, diallyl sebacate, diallyl adipate, diallyl malonate, diallyl glycolate, aconit Triallyl acid, triallyl phosphate, etc.

Acrylic ester thermosetting plasticizer Allyl methacrylate, diallyl fumarate, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, cyclohexyl methacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, butane 1,4 diol dimethacrylate, trimethylolpropane trimethacrylate,
Trimethylolpropane triacrylate, trimethylolpropane propylene oxide adduct triacrylate, dimethylaminoethyl methacrylate, 1,3 butylene glycol dimethacrylate, etc.

Unsaturated Polyester Thermosetting Plasticizer Radical polymerization is carried out by heating with a linear polyester having some double bonds in the molecule.

Epoxy Thermosetting Plasticizer A curing agent such as an aliphatic amine or an acid anhydride is added to a long-chain or cyclic aliphatic epoxy resin to cure it.

In particular, an allyl ester type thermosetting plasticizer,
Acrylic ester-based thermosetting plasticizers include benzoyl peroxide (BPO), t-butyl perbenzoate (TBPB), dicumyl peroxide (DC) as polymerization catalysts.
PO), cumene hydroperoxide (CHPO), etc. are added and heated to radically polymerize and cure.

The thermosetting plasticizer and catalyst used in the heel paste may be appropriately selected from the above. In the examples described later, trimethylolpropane trimethacrylate is used as the thermosetting plasticizer and t-butyl is used as the catalyst. Perbenzoate (TBPB) was used.

Further, in the foamed slush molded shoe 1'shown in FIG. 2, the foaming ratio of the bottom surface 6b of the heel portion 6 of the reinforcement-needed portion 7 in contact with the heel core 9 is such that the toe portion 5 and the shoe sole portion 3 are foamed. It is smaller than the magnification. Therefore, the degree of foaming of the bottom surface 6b of the heel portion 6 of which the strength is particularly required among the reinforcement-required portions 7 depends on the toe portion 5 and the shoe sole portion 3.
The degree of foaming of the bottom 6b of the heel portion 6 is suppressed most in the shoe body 2, and the strength of the bottom 6b of the heel 6 is secured.

The heel paste constituting the heel core 9 may contain one or both of a heat-resistant hollow body and a foaming inhibitor.

The inclusion of the hollow body makes it possible to reduce the weight of the heel core 9 which is a heat-gelated paste of the heel paste. As a means for reducing the weight of the heel core 9, it is possible to include a foaming agent in the heel paste,
When foaming by heating, the heel paste injected into the inner bottom surface of the semi-gelated product may expand in a convex shape, and the predetermined shape of the heel core 9 having a substantially straight upper surface may not be maintained. Further, as will be described later, when the foaming inhibitor is contained in the heel paste, there is a problem that even if the foaming agent is contained, the foaming inhibitor cannot foam. If it is a hollow body, there is no need for foaming due to heating, and it is possible to form a void by itself and make it the same as a foamed state, and such a problem does not occur.

On the other hand, by containing the foaming inhibitor, the foaming ratios of the bottom surface 6b and the rear surface 6a of the heel portion 6 of the shoe body 2 with which the heel paste comes into contact are changed without changing the foaming heating conditions of the heel portion 6. Therefore, the strength of the heel portion 6 can be further improved.

Examples of the hollow body include shirasu balloon, silica balloon, glass balloon, carbon balloon, alumina balloon, vinylidene chloride balloon and phenol balloon.

As the foaming inhibitor, maleic acid,
Organic acids such as fumaric acid and 1,2-phthalic acid Stearoyl chloride, halogenated organic acids such as phthaloyl chloride, maleic anhydride, phthalic anhydride, trimellitic anhydride, and other organic acid anhydrides; Nitrogen-containing substances such as alcohols, fatty acid amines, amides and oximes, sulfur-containing substances such as mercaptans, sulfides and isocyanates, phosphates such as phosphite chloride, tin compounds such as dibutyltin malate, tin chloride and tin sulfate. Other examples include hexachlorocyclopentadiene.

The composition of the heel paste containing the hollow body and the foam suppressor is, for example, 100 parts by weight of polyvinyl chloride paste resin, plasticizer: 70 parts by weight, thermosetting plasticizer: 20 parts by weight, Examples include catalyst: 0.2 parts by weight, stabilizer: 1 part by weight, hollow body: 10 parts by weight, foaming inhibitor: 5 parts by weight, pigment: 1 part by weight.

(4) Foam slush molding shoe according to claim 4 As shown in FIG. 3 (a) or FIG. 3 (b), the foam slush molding shoe 1 ″ according to claim 4 is such a shoe. A non-foamed or low-foamed skin formed by heating (gelling) a plastisol containing a polyvinyl chloride paste resin on all (see FIG. 3A) or part (see FIG. 3B) of the outer surface of the main body 2. A skin layer 10 is provided.

The polyvinyl chloride paste resin contained in the plastisol constituting the skin layer 10 is used as the shoe body 2
It is desirable that it is exactly the same as the above-mentioned polyvinyl chloride paste resin contained in the plastisol constituting the above, from the viewpoint of sufficiently maintaining the adhesion strength between the shoe body 2 and the skin skin layer 10.

The plastisol constituting the skin skin layer 10 contains a plasticizer, a stabilizer, a pigment and the like in addition to the polyvinyl chloride paste resin. These compounding examples are based on 100 parts by weight of the polyvinyl chloride paste resin. And plasticizer:
80-100 parts by weight, stabilizer: 3-5 parts by weight, pigment: 1
~ 3 parts by weight.

The film formation range of the skin skin layer 10 may be a range that covers the entire outer surface of the shoe body 2 as shown in FIG. 3 (a), or as shown in FIG. 3 (b). It may be a range that covers not only the entire outer surface of 2 but also the reinforcement required portion 7 such as the toe portion 5, the heel portion 6 and the bottom portion 3 of the shoe main body 2 and the rear vertical wall surface 11.

Here, the rear vertical wall surface 11 is the outer surface of the foamed slush molded shoe 1 ″, and in the slush molding step, the mold for the slush molded shoe is tilted backward to discharge the surplus ungelled inside. The outer surface formed by the ungelled sol flowing and discharged at the time of contact with the inner wall surface of the rear portion of the slush molding shoe mold.

That is, the foam slush molded shoe 1 ″ shown in FIG. 3 (b) has a skin skin layer 10 for protecting the shoe body 2 as compared with the foam slush molded shoe 1 ″ shown in FIG. 3 (a). The film formation range is limited to the range where scratch resistance needs to be improved. Furthermore, although the skin skin layer 10 is thin because it is a thin film, the increase in wall thickness increases the strength between the toe portion 5, the heel portion 6, the bottom portion 3 and other reinforcement-requiring portions 7 and the rear vertical wall surface 11. Produce an effect.

The thickness of the skin layer 10 is 0.5 mm.
If it exceeds, the lightening effect is reduced accordingly and the leather pattern design and the small wrinkles in the leather kerf formed on the surface of the shoe body 2 are covered. Therefore, the thickness of the skin skin layer 10 is preferably 0.5 mm or less. From this point of view, it is not necessary to set the lower limit of the thickness of the skin skin layer 10, but if the thickness is too thin, the protective effect of the shoe body 2 is insufficient, so the lower limit of the thickness of the skin skin layer 10 is 0.1 mm.
Is desirable.

As described above, in the foam slush molded shoe 1 ″ according to the present invention having the shoe body 2 and the skin skin layer 10, the shoe body 2 is foamed by thermal expansion of the thermally expandable microcapsules. As a result, the weight is reduced and the heat insulating property is improved because the foamed part has a heat insulating effect. In addition, foaming softens the feel and improves comfort. In addition to the leather pattern design on the surface of the shoe body 2 due to foaming, small wrinkles in the leather calf are formed,
A sense of quality is added. Furthermore, since the heat-expandable microcapsules are simply used for the same material as the conventional slush-molded shoes, it can be manufactured at low cost.

In the foamed slush molded shoe 1 ″ according to the present invention as defined in claim 4, the shoe skeleton is the shoe body 2, and the skin skin layer 10 is the surface protective film of the shoe body 2 ( Although it acts as a skin, the rigidity of the rear vertical wall surface 11, for example, of the shoe main body 2 is improved by a slight increase in the wall thickness.

Further, in the foamed slush molded shoe 1 ″ according to claim 4, from the viewpoint of further promoting the weight reduction, the plastisol constituting the skin skin layer 10 contains a small amount of a foaming agent and is in a low foaming state. You may make it the same as the thickness of the skin layer 10 which is not foamed.

The foaming agent is an azo compound such as azodicarbonamide, azobisformamide, azobisisobutyronitrile, azohexahydrobenzonitrile, diazoaminobenzene, dinitrosopentamethylenetetramine, N,
Nitroso compounds such as N'dinitroso-N, N'-dimethylterephthalamide, benzenesulfonylhydrazide, toluenesulfonylhydrazide, diphenylsulfone-3,3 '
-Disulfonyl hydrazide, diphenyl oxide-4,4 '
-Examples of hydrazide compounds such as disulfonyl hydrazide, organic chemical foaming agents such as terephthalazide, P-toluenesulfonyl semicarbazide, trihydrazinotriazine and inorganic chemical foaming agents such as sodium bicarbonate, ammonium bicarbonate and ammonium carbonate can do.

If the content of the foaming agent exceeds 0.3 parts by weight with respect to 100 parts by weight of the polyvinyl chloride paste resin, foaming on the surface of the epidermis skin layer 10 becomes remarkable and the protective function of the shoe body 2 deteriorates. Therefore, the content of the foaming agent is preferably 0.3 parts by weight or less with respect to 100 parts by weight of the polyvinyl chloride paste resin, and more preferably 0.1 parts by weight or less from the same viewpoint.

(5) Foam slush molded shoe according to claim 5 As shown in FIG. 4 (a) or FIG. 4 (b), all or part of the outer bottom of the shoe body 2 (FIG. 4 (a) or FIG. Four
All of the examples shown in (b) are provided with a shoe sole 12 which contains a polyvinyl chloride paste resin and basically consists of a heat-gelated substance of plastisol containing no foaming agent.

As an example of the composition of such a plastisol, plasticizer: 80 to 100 parts by weight, stabilizer: 3 to 5 parts by weight, pigment: 1 to 3 parts by weight with respect to 100 parts by weight of polyvinyl chloride paste resin. Is.

The shoe sole 12 is formed to have a substantially uniform thickness over its entire area. As the forming means, as will be described later, a method of manufacturing a two-layer slush-molded shoe having the shoe sole 12 as the first layer and the shoe body 2 as the second layer is used.

Foam slush molding shoe 1'according to the present invention
In ″, since the plastisol forming the shoe sole 12 and the plastisol forming the shoe body 2 including the heat-expandable microcapsules are different from each other to form a two-layer slush-molded shoe, the composition of both plastisol is appropriately adjusted. As a result, the wear resistance of the shoe sole 12 can be reliably maintained while reducing the weight of the shoe main body 2. That is, the plastisol that constitutes the shoe main body 2 has a composition that emphasizes the aforementioned effects such as weight reduction and heat retention, and the plastisol that constitutes the shoe sole 12 has a composition that emphasizes abrasion resistance.

Since the shoe sole 12 is present, the amount of heat received by the sole portion 3 of the shoe main body 2 during heating for slush molding is absorbed by the sole sole 12 and the temperature rise of the sole portion 3 is suppressed. Therefore, the wall thickness of the bottom portion 3 with which the shoe sole 12 contacts is reduced as compared with the toe portion 5 and the heel portion 6, but the shoe sole 12 maintains sufficient strength, wear resistance and the like. Also, the sole 1
The presence of 2 increases the heat capacity and reduces the amount of heat received by the bottom portion 3 during the semi-gelation, so that the foaming ratio of the bottom portion 3 is suppressed to be low and the strength of the bottom portion 3 increases.

In this case, the thickness of the bottom portion 3 is preferably 1 mm or less. When the thickness of the bottom portion 3 of the shoe body 2 exceeds 1 mm, the foaming suppressing effect by contacting the sole 12 is reduced, and the foaming of the bottom portion 3 cannot be suppressed, so that the desired strength of the bottom portion 3 may not be secured. . Therefore, the bottom 3
It is desirable that the wall thickness of is less than 1 mm. Further, when the thickness of the bottom portion 3 is 0.3 mm or more and 0.5 mm or less, the degree of foaming is reduced to low foaming, and when it is 0.1 mm or less, the gas generated when the foaming agent is decomposed is released into the air. It becomes non-foaming. Therefore, the wall thickness of the bottom portion 3 is preferably 1 mm or less, and the lower the thickness, the more preferable the foaming is suppressed.

By incorporating a foaming inhibitor into the shoe sole 12, it is possible to suppress not only the heel portion 6 of the shoe main body 2 but also the sole portion 3 as a whole. In particular, for example, the heel portion 6 of the shoe body 2 of the foam slush molded shoe 1 '''shown in FIG. 4 (b) is sandwiched between the heel core 9 containing the foam suppressing agent and the shoe sole 12 containing the foam suppressing agent from above and below. Will be rare,
Foaming is significantly suppressed and the strength is increased.

In this case, as an example of the composition of the plastisol constituting the shoe sole 12, a polyvinyl chloride paste resin 10 is used.
Plasticizer: 70 parts by weight, thermosetting plasticizer: 20 parts by weight, catalyst: 1 part by weight, stabilizer: 1 part by weight, relative to 0 parts by weight
Foaming inhibitor: 5 parts by weight, pigment: 1 part by weight.

Other resins that can be used in the plastisol constituting the shoe sole include crosslinkable polyvinyl chloride resin, copolymer resin or crosslinkable polyvinyl chloride resin, thermosetting plasticizer and oil resistant plasticizer. The wear resistance of the shoe sole can be improved by using a combination of two or more of these kinds. Hereinafter, these resins will also be described.

Particularly effective resins for improving various performances of shoe soles are three kinds of crosslinkable polyvinyl chloride resin, copolymer resin or crosslinkable polyvinyl chloride resin, thermosetting plasticizer and oil resistant plasticizer. It is configured by combining any two or more of the above, and specifically, the following six types A to F are provided.

A: Crosslinkable polyvinyl chloride resin B: Copolymer resin C: Crosslinkable polyvinyl chloride resin and thermosetting plasticizer D: Thermosetting plasticizer and oil resistant plasticizer E: Crosslinkable polyvinyl chloride resin Oil-Resistant Plasticizer F: Crosslinkable Polyvinyl Chloride Resin, Thermosetting Plasticizer, and Oil-Resistant Plasticizer Furthermore, a slip-resistant material is mixed in each of the plastisols in which these resins A to F are mixed, and / or coloring. It can be combined to give transparency, and finally A, A +, A +
, A ++, B, B +, B +, B ++, ...
......, F, F +, F +, F ++ in total of 24 types.

(I) A: crosslinkable polyvinyl chloride resin,
A + slip-resistant material, A + colored transparency, A + slip-resistant material + colored transparency The crosslinkable polyvinyl chloride resin preferably used for the sole of the present invention is a hydroxyl group, a carboxyl group, an epoxy group and an alkoxy group in the molecule. And one or more of them, and a crosslinking agent such as isocyanate is mixed and heated to crosslink and cure.

As the crosslinking agent, tolylene diisocyanate, tolylene isocyanate dimer, diphenylmethane diisocyanate, hexamethylene diisocyanate, trimethylolpropane-tolylene diisocyanate adduct, triphenylmethane triisocyanate, polymethylene polyphenyl isocyanate, succinic acid, glutar Acids, adipic acid, pimelic acid, azelaic acid, phthalic acid, maleic acid, cyclohexanedicarboxylic acid and their anhydrides, epoxies up to n = 10, triglycidyl isocyanate, 4,4'-diaminodiphenylmethaneglycidylamine, in the molecule Mercapto (-S-
H) group-containing azole, thiazole and triazine compounds or metal salts thereof (2-R-4.6-dimercapto-S-triazine etc.), azo groups (-N = N-) in the molecule.
Group), a -S-S- group, a -NS- group, a compound containing a -O-O- group, and the like.

An example of the composition of the plastisol mixed with the crosslinkable polyvinyl chloride resin is polyvinyl chloride paste resin:
50 to 90 parts by weight, crosslinkable polyvinyl chloride resin: 10
50 parts by weight, plasticizer: 80 to 120 parts by weight, stabilizer: 2
~ 3 parts by weight, crosslinking agent: 0.5 to 3 parts by weight, pigment: 0 to 2
Parts by weight.

In the present invention, when the shoe sole is made of a heat-gelated plastisol mixed with a cross-linkable polyvinyl chloride resin, the heat resistance of the shoe sole is improved by the cross-linking and the shoe sole melts even under heating conditions. It becomes difficult to do so, and cigarette resistance (heat resistance) is improved. Also, the strength of the sole due to cross-linking,
Oil resistance, chemical resistance and abrasion resistance are also improved.

If plastisol mixed with a crosslinkable polyvinyl chloride resin is injected up to the upper end of the slush molding shoe mold to effect crosslinking, peeling from the slush molding shoe mold will be difficult due to the crosslinking, and demoldability will be improved. However, in the present invention, since only the sole of the shoe uses the plastisol mixed with the crosslinkable polyvinyl chloride resin, the mold release property does not deteriorate so much, and the expensive crosslink is used. Since the amount of plastisol mixed with the water-soluble polyvinyl chloride resin can be suppressed to a necessary minimum, the increase in manufacturing cost can be suppressed as much as possible.

Further, in the present invention, the plastisol mixed with the crosslinkable polyvinyl chloride resin, which is a raw material for the sole, is further mixed with an anti-slip material, if necessary, to improve the strength and oil resistance of the sole. In addition to chemical resistance and abrasion resistance, the slip resistance of the shoe sole can be further improved.

Since the anti-slip material is generally colored and insoluble, if it mixes in a part other than the sole, it will be recognized as a foreign substance and the appearance quality will be remarkably deteriorated. However, it is mixed only in the sole here. In addition, it is possible to impart the anti-slip effect to the sole without deteriorating the appearance quality. Rather, by mixing the anti-slip material, the anti-slip property that can be surely imparted to the shoe sole can be visually appealed, so that the commercial property of the slush-molded shoes to be sold in a snowy place or the like can be improved.

Specific examples of the anti-slip material include cotton, suf (staple fiber), rayon, acrylic, vinylon, nylon, polyester, polyurethane, and glass fiber having a thickness of 50 denier or less,
Relatively thin and short fibers with a length of 3.0 mm or less, leather powder, metal type whiskers, inorganic type whiskers, metal powders such as iron and aluminum, alumina powder, ceramic powder, synthetic rubber such as NBR, Cross-linked resin, acrylic resin,
It is an insoluble powder such as urethane resin. The powdery anti-slip material has a size of 30 mesh or less, preferably 10 mesh.
It is 0 mesh or less.

Further, the plastisol mixed with the crosslinkable polyvinyl chloride resin constituting the shoe sole and the plastisol mixed with the polyvinyl chloride resin constituting the shoe body have the same color,
For example, if it is black, the boundary between the sole and the shoe body will be inconspicuous and the appearance quality will improve, but in addition to this,
When the plastisol mixed with the crosslinkable polyvinyl chloride resin that is the raw material for the sole is colored and has transparency,
Slash molding by slush molding Slash molding When the first injection into the slush molding shoe mold, even if there is rebound to the inner surface of the slush molding shoe or adhesion to the inner surface of the slush molding shoe mold due to vibration, the subsequent heating gel Since the resin is transparent when it naturally flows down to become a thin film before becoming solid, it becomes inconspicuous, and the bounce marks due to the first injection can be made inconspicuous at the product stage.

Therefore, it is desirable for a slush-molded shoe that requires a mass productivity because the reworking process associated with rebound can be omitted. In addition, since plastisol mixed with transparent cross-linkable polyvinyl chloride resin is used for the sole, it is possible to make a high-quality sole similar to rubber by approximating the hue of rubber crepe or smoke. ,
It is possible to further improve the marketability.

In order to impart coloring transparency to a plastisol mixed with a crosslinkable polyvinyl chloride resin, pigments (paste pigments or master pigments) are usually used in an amount of about 1 to 2 parts by weight per 100 parts by weight of resin. In the case of a batch, the amount of resin or plasticizer mixed with the pigment is not included.)
0.2 parts by weight, more preferably 0.02 to 0.1 parts by weight.

(II) B: Copolymer resin, B + slip resistant material, B + colored transparency, B + slip resistant material + colored transparency The copolymer resin is a resin obtained by copolymerizing a vinyl chloride monomer and a comonomer, Specific examples thereof include vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinylidene chloride copolymer resin, vinyl chloride-propylene copolymer resin, and vinyl chloride-ethylene copolymer resin. Such a copolymer resin has a property of gelling and melting in a lower temperature region as compared with a conventional straight resin (for example, polyvinyl chloride resin) which has been conventionally used.

An example of the composition of the plastisol mixed with the copolymer resin is 100 to 20 parts by weight of copolymer resin, 80 to 120 parts by weight of plasticizer, 2 to 3 parts by weight of stabilizer, and 0 to 2 parts by weight of pigment. .

As the plasticizer, various plasticizers such as adipic acid ester-based, polyester-based, epoxy-based and the like can be used in addition to phthalate ester-based plasticizers such as DOP.

Examples of the stabilizer include tin laurate type stabilizers such as diphtyltin dilaurate, tin malate type stabilizers such as diptyltin dimalate, tin mercapto type, Ba type, and the like.
Each stabilizer such as Zn-based, Ca-based and composites thereof can be used.

Since the plastisol in which the copolymer resin is mixed is used for the shoe sole, the gelling property of the first layer corresponding to the shoe sole is improved in the production thereof. By continuing heating and raising the temperature to the curing temperature of the second layer corresponding to the shoe body, the adhesion strength at the interface between the first layer and the second layer is further improved, which causes a problem in the two-layer slush molded shoe. Interfacial peeling between the sole of the shoe and the shoe body in contact therewith is eliminated.

In other words, when the heel portion of the first layer is heated, this heel portion has a large capacity, so that the heat supplied is immediately transferred to the second layer side having a large heat capacity and further to the heel. Therefore, it is difficult for both the first layer and the second layer to gel.

When a straight polyvinyl chloride resin is used for the first layer, even if a copolymer resin is used for the second layer, gelation of the first layer is difficult to proceed, and physical properties, abrasion resistance and adhesive strength are Also decreases. However, when a copolymer resin is used for the first layer, it has good gelation property and is easily heated because it is heated from the outside. Therefore, even if a straight polyvinyl chloride resin is used for the second layer, the physical properties are ，
Both the abrasion resistance and the adhesive strength are remarkably improved.

Therefore, when the polyvinyl chloride paste resin is used for the shoe body and the polyvinyl chloride paste resin is used for the shoe sole, or the copolymer resin is used for the shoe body and the polyvinyl chloride paste resin is used for the shoe sole, By appropriate means (for example, accurately controlling the heating temperature of the heel part) to raise the layer to its melting temperature and secure the physical properties of the sole, abrasion resistance, and the adhesive force between the sole and the main body of the shoe. It was necessary to control the first layer so as to reach its melting temperature, but by using a copolymer resin in the first layer, the gelling / melting temperature of the first layer is lowered, and it is easy even under the same heating conditions. Further, since the melting temperature of the first layer is reliably reached, it becomes possible to heat and gel the second layer without the need to control the temperature as described above. Dense Strength will ensure maintained.

[0110] Further, the heated gelated product of plastisol in which the copolymer resin is mixed in the shoe sole is used, and the hardness of the heated gelled product is lower than that of the heated gelled product of plastisol mixed with the polyvinyl chloride paste resin. It is possible to manufacture a shoe having a sole with flexibility and a large road surface-capturing force and excellent slip resistance.

In the slush molded shoe according to the present invention, it is possible to use not only the copolymer resin for the first layer, which is the sole, but also the plastisol mixed with the copolymer resin for the second layer, which is the shoe body. Thus, also by doing so, it becomes possible to improve the gelling property and the adhesiveness between the heel portion of the first layer and the second layer in contact with the heel portion. However, since the copolymer resin tends to thicken as compared with the polyvinyl chloride resin, if it is recovered and reused as the surplus of the second layer, the viscosity increases before reuse.
Problems such as thickness stability and pinholes occur.
In order to solve these problems, the manufacturing cost is increased, and there is a possibility that mass production, which is an advantage of the slush molded shoe, may be hindered. Therefore, from the viewpoints of adhesiveness between the first layer and the second layer, workability, stability of quality, price, and the like, a polyvinyl chloride resin is used for the second layer, which is an inner layer, and a copolymer resin is not used. desirable.

(III) C: Crosslinkable polyvinyl chloride resin and thermosetting plasticizer, C + slip resistant material, C + color transparency, C + slip resistant material + color transparency In the present invention, a crosslinkable polyvinyl chloride resin is used. Although a plastisol mixed with a thermosetting plasticizer is used, the crosslinkable polyvinyl chloride resin is omitted because it has been described in (I) A above.

The plastisol mixed with the crosslinkable polyvinyl chloride resin is a powder of the crosslinkable polyvinyl chloride resin and tends to have a relatively high viscosity, so the workability of the work such as injection into a slush molding shoe mold is deteriorated. May occur.

Therefore, a thermosetting plasticizer is mixed with the plastisol in order to prevent deterioration of workability.

Since the thermosetting plasticizer is a liquid before curing, when mixed with a plastisol mixed with a crosslinkable polyvinyl chloride resin, the viscosity of this plastisol can be adjusted, and after heating, it crosslinks to form a resin. In addition, since there are many types of thermosetting plasticizers and the hardness after curing can be selected from relatively soft to hard, it is possible to set the hardness of the shoe sole to some extent. Become.

The types of thermosetting plasticizers that can be used here are listed below. Allyl ester thermosetting plasticizers: diallyl phthalate, allyl acrylate, triallyl theater, diallyl maleate, dichloroallyl maleate, diallyl itaconic acid, diallyl sebacate, diallyl adipate, diallyl malonate, diallyl glycolate, aconit Triallyl acid, triallyl phosphate and the like.

Acrylic ester type thermosetting plasticizer Allyl methacrylate, diallyl fumarate, triethylene glycol dimethacrylate, ethylene glycol dimethacrylate, cyclohexyl methacrylate, tetraethylene glycol dimethacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, butane 1,4 diol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, trimethylolpropane propylene oxide adduct triacrylate, dimethylaminoethyl methacrylate, 1,
3 butylene glycol dimethacrylate etc.

Unsaturated Polyester Thermosetting Plasticizer Radical polymerization is carried out by heating with a linear polyester having some double bonds in the molecule.

Epoxy Thermosetting Plasticizer A curing agent such as an aliphatic amine or an acid anhydride is added to a long-chain or cyclic aliphatic epoxy resin to cure it.

In particular, an allyl ester type thermosetting plasticizer,
Acrylic ester-based thermosetting plasticizers include benzoyl peroxide (BPO), t-butyl perbenzoate (TBPB), dicumyl peroxide (DC) as polymerization catalysts.
PO), cumene hydroperoxide (CHPO), etc. are added and heated to radically polymerize and cure.

The composition examples of the plastisol in which the crosslinkable polyvinyl chloride resin and the thermosetting plasticizer are mixed are as follows: polyvinyl chloride paste resin: 50 to 90 parts by weight, crosslinkable polyvinyl chloride resin: 10 to 50 parts by weight. , Plasticizer: 80
~ 120 parts by weight, thermosetting plasticizer: 10 to 40 parts by weight,
Catalyst: 0.3 to 1 part by weight, stabilizer: 2 to 3 parts by weight, crosslinking agent: 0.5 to 3 parts by weight, pigment: 0 to 2 parts by weight.

In such a foamed slush molded shoe, all or a part of the sole is composed of a heat-gelated substance of plastisol in which a crosslinkable polyvinyl chloride resin and a thermosetting plasticizer are mixed. The heat resistance is improved, it becomes difficult to melt even under heating conditions, and the cigarette resistance (heat deformation resistance) is improved.

Further, the cross-linking also improves the sole strength, oil resistance, chemical resistance and abrasion resistance. Since the plastisol mixed with the crosslinkable polyvinyl chloride resin and the thermosetting plasticizer is used for all or part of the sole of the shoe, the mold releasability does not deteriorate so much and the amount used is the minimum required. Therefore, the increase in manufacturing cost can be suppressed as much as possible.

(IV) D: Thermosetting plasticizer and oil resistant plasticizer, D + slip resistant material, D + color transparency, D +
In the present invention, a plastisol in which a thermosetting plasticizer and an oil resistant plasticizer are mixed is used, but the thermosetting plasticizer is omitted because it has been described in (III) C above.

Here, the plastisol mixed with the thermosetting plasticizer is further mixed with an oil resistant plasticizer (for example, a high molecular weight plasticizer), whereby oil resistance is imparted to the sole of the shoe and gasoline is added. And less extraction to oils,
Further improve the adaptability for use at gas stations and various food factories.

The oil-resistant plasticizer is a polymerization type polyester plasticizer such as adipic acid type polyester and phthalic acid type polyester, and has a polymerization degree of 800 or more and 4000 or less, preferably 1000 or more and 3000 or less.

When the degree of polymerization is less than 800, the plasticizer is extracted into vegetable oils, animal oils, gasoline, etc. in food factories to become hard and the effect of improving oil resistance is reduced, while the degree of polymerization is 20.
If it is 00 or more and 4000 or less, the effect of improving oil resistance becomes large, but if the degree of polymerization exceeds 4000, the viscosity of plastisol becomes high and the fluidity remarkably deteriorates, resulting in poor workability.

A composition example of a plastisol in which a thermosetting plasticizer and an oil resistant plasticizer are mixed is as follows: polyvinyl chloride paste resin: 100 parts by weight, primary plasticizer: 10 to 50 parts by weight, oil resistant polyester plasticizer: 80 to 40 parts by weight, thermosetting plasticizer: 10-40 parts by weight, catalyst: 0.3-1 part by weight, stabilizer: 2-3 parts by weight, pigment: 0-2 parts by weight.

Since all or part of the sole is composed of a heat-gelated substance of plastisol in which a thermosetting plasticizer and an oil-resistant plasticizer are mixed, the heat resistance of the sole is improved and the sole is under heating conditions. Even if it is difficult to melt, cigarette resistance (heat distortion resistance) is improved.

Further, the strength and abrasion resistance of the shoe sole are also improved. Furthermore, since an oil resistant plasticizer is mixed, oil resistance and chemical resistance are also improved. The plastisol mixed with the thermosetting plasticizer and the oil resistant plasticizer is used for the sole of the shoe, so the mold release property does not deteriorate so much, and the expensive thermosetting plasticizer and oil resistant plasticizer are used. Since the amount of the mixed plastisols used can be suppressed to a necessary minimum, the increase in manufacturing cost can be suppressed as much as possible.

(V) E: Crosslinkable polyvinyl chloride resin and oil resistant plasticizer, E + slip resistant material, E + color transparency, E + slip resistant material + color transparency In the present invention, crosslinkable polyvinyl chloride resin and oil resistance A plastisol mixed with a plasticizer is used, but the crosslinkable polyvinyl chloride resin and the oil-resistant plasticizer have been described in the above (I) A and (IV) D, respectively, and will be omitted.

The composition example of the plastisol in which the crosslinkable polyvinyl chloride resin and the oil resistant plasticizer used here are mixed,
Polyvinyl chloride paste resin: 90 to 0 parts by weight, crosslinkable polyvinyl chloride resin: 10 to 100 parts by weight, primary plasticizer: 10 to 50 parts by weight, oil resistant polyester plasticizer: 8
0-40 parts by weight, stabilizer: 2-3 parts by weight, cross-linking agent: 0.
5 to 3 parts by weight, pigment: 0 to 2 parts by weight.

In this foamed slush molded shoe, all or a part of the sole is made of a heat-gelated plastisol mixed with a crosslinkable polyvinyl chloride resin and an oil resistant plasticizer. Is improved and it becomes difficult to melt even under heating conditions, and cigarette resistance (heat distortion resistance) is improved.

Further, the strength and wear resistance of the shoe sole are improved by the crosslinking. Furthermore, since an oil resistant plasticizer is mixed, oil resistance and chemical resistance are also improved. It should be noted that the plastisol mixed with the crosslinkable polyvinyl chloride resin and the oil-resistant plasticizer is used for the sole of the shoe, so the mold release property does not deteriorate so much, and the expensive crosslinkable polyvinyl chloride resin and the oil-resistant plasticizer are used. Since the amount of plastisol mixed with the agent can be suppressed to the necessary minimum, the increase in manufacturing cost can be suppressed as much as possible.

(VI) F: Crosslinkable polyvinyl chloride resin, thermosetting plasticizer, oil resistant plasticizer, F + slip resistant material, F + colored transparency, F + slip resistant material + colored transparency A plastisol in which a polyvinyl chloride resin, a thermosetting plasticizer, and an oil resistant plasticizer are mixed is used. Regarding the crosslinkable polyvinyl chloride resin, the thermosetting plasticizer and the oil resistant plasticizer, the above (I) A, (III )
Since they have been described in C and (IV) D respectively, description thereof will be omitted.

A crosslinkable polyvinyl chloride resin used here,
A composition example of a plastisol in which a thermosetting plasticizer and an oil resistant plasticizer are mixed is a polyvinyl chloride paste resin: 50
~ 90 parts by weight, crosslinkable polyvinyl chloride resin: 10-50
Parts by weight, primary plasticizer: 10 to 50 parts by weight, oil resistant polyester plasticizer: 80 to 40 parts by weight, thermosetting plasticizer: 1
0-40 parts by weight, catalyst: 0.3-1 part by weight, stabilizer: 2
~ 3 parts by weight, crosslinking agent: 0.5 to 3 parts by weight, pigment: 0 to 2
Parts by weight.

The foam slush molded shoe according to the present invention is
All or part of the sole is composed of a heated gel of plastisol mixed with cross-linkable polyvinyl chloride resin, thermosetting plasticizer and oil-resistant plasticizer. It becomes difficult to melt even under the conditions, and the cigarette resistance (heat distortion resistance) is improved.

Further, the strength and wear resistance of the sole are improved by the crosslinking. Furthermore, since oil-resistant plasticizers are mixed, oil resistance and chemical resistance are also improved.Here, it is the sole that uses plastisol mixed with cross-linkable polyvinyl chloride resin, thermosetting plasticizer and oil-resistant plasticizer. Therefore, the demolding property does not deteriorate so much, and the amount of the plastisol mixed with the expensive crosslinkable polyvinyl chloride resin, thermosetting plasticizer and oil-resistant plasticizer can be suppressed to the necessary minimum. Therefore, the increase in manufacturing cost can be suppressed as much as possible.

(6) Foam slush molded shoe according to claim 6 As shown in FIGS. 5 (a) and 5 (b), the foam slush molded shoe 1 '''''has the shoe body 2 of (4). This is a case where both the skin skin layer 10 described in the item 1 and the shoe sole 12 described in item (5) are provided, and in the slush molding step, the skin layer 10 is first formed and then the shoe sole 1 is formed.
2 is formed, a shoe sole 12 is formed on the bottom surface between the epidermis skin layer 10 and the shoe main body 2 as shown in FIG. As shown, the shoe sole 12 is formed on the outer surface of the bottom surface of the epidermis skin layer 10.
The shoe sole 12 may be formed on all or part of the bottom surface, and does not necessarily have to be the entire surface.

(7) Foamed slush molded shoe according to claim 7 In the present invention, the shoe body was foamed by incorporating the heat-expandable microcapsules into plastisol. However, a foaming agent is used in combination with the heat-expandable microcapsules. Good. The type of the foaming agent has been described in the item (4), so the description thereof is omitted here.

Since the cost increase can be suppressed and the foaming ratio of the shoe body after foaming can be more stabilized by containing the foaming agent, it is desirable to use the foaming agent together with the heat-expandable microcapsules.

As the foaming agent, it is desirable to use a foaming agent having a decomposition temperature substantially the same as the thermal expansion temperature of the thermally expandable microcapsules. Next, a method for manufacturing the foamed slush molded shoe according to the present invention will be described in detail for each claim together with operational effects. (8) Method for manufacturing foam slush molded shoe according to claim 8 (first step) As shown in FIG. 6, a step of an embodiment of a method for manufacturing a foam slush molded shoe of the present invention is as follows. ), And a plastisol containing a polyvinyl chloride paste resin having the composition described in the above section and heat-expandable microcapsules,
Pour into the slush molded shoe mold to the height required for the shoe body of the slush molded shoe (see Figure 6). The required height is usually up to near the top opening of the slush molding shoe mold.

After the injection, the heating conditions of the injected plastisol, that is, the part to be reinforced such as the toe part, the heel part and the bottom part of the shoe body, and the part other than this reinforced part are to be heated. (One or both of the heating temperature and the heating time) is different, and heating is performed at a temperature higher than the semi-gelation temperature and lower than the gelation temperature so that a large amount of heat is supplied to the reinforcing portion. For example, reinforcement required part: 100 ° C
X 5 to 7 minutes, other parts: heating at 100 ° C x 1 to 2 minutes.

It is not necessary to limit the heating means for heating the portion to be reinforced to be different from the heating conditions for the other portions to a specific means. For example, means for heating by appropriately adjusting the arrangement and temperature of the heating device provided on the furnace wall of the heating furnace for heating the slush molding shoe mold into which the plastisol is injected can be exemplified.

As described above, by heating under different heating conditions between the reinforcement-requiring portion and the other portion, the thickness of the reinforcement-requiring portion is larger than that of the other portion. Compound is applied to the inner wall surface of the slush molded shoe mold to form a layer.

After that, since the unplastified surplus plastisol remains inside the semi-gelated product,
The surplus plastisol is discharged to the outside of the slush molded shoe mold by an appropriate means such as inclining the slush molded shoe mold.

(Second Step) Slush Molding A shoe body-shaped semi-gelled product formed on the inner wall surface of a shoe mold is heated to a temperature range not lower than the gelation temperature and lower than the thermal expansion temperature to promote gelation. To do. That is,
There is a difference between the gelling temperature at which the semi-gelated product is sufficiently gelled and the thermal expansion temperature at which the shoe body is foamed by thermally expanding the thermally expandable microcapsules, and in the case of the plastisol described above, Gelation temperature: about 160 ° C, thermal expansion temperature:
It is about 19 ° C.

Therefore, by heating the semi-gelated product in a temperature range not lower than the gelation temperature and lower than the thermal expansion temperature, preferably for a long time, the amount of heat received by each part of the semi-gelated product is increased without the foaming of the shoe body. Can be promoted. The gelling may be completed by this heating, or may be limited to the extent that it is completed together with the subsequent heating to the thermal expansion temperature or higher.

The heating for gelation may be carried out under the same heating conditions for the entire semi-gelated product. However, this semi-gelated product has different wall thicknesses between the reinforcement-needed portion and other portions, and Since the amount of heat required for gelation in the thick portion is naturally larger than that in the thin portion, for example, a thick reinforcing portion required: 170 ° C x 3 to 4 minutes, other thin portion: 160 ° C × 3 to 4 minutes or required reinforcement: 1
70 ° C x 3-4 minutes, other parts: 170 ° C x 2-3
It is desirable to set the heating conditions such that the amount of heat supplied to the reinforcement-required portion is large, such as minutes. The means for differentiating the heating conditions of the portion requiring reinforcement from the heating conditions of the other portions is the same as described above, and it is not necessary to limit it to a specific means.

Subsequently, the shoe body is heated to a temperature not lower than the thermal expansion temperature,
Desirably, by heating for a short time, when the gelation is not completed, the gelation is completed and the thermally expandable microcapsules are appropriately thermally expanded to foam the shoe body. The thermally expandable microcapsules start thermal expansion in a low temperature range below the thermal expansion temperature, but the shoe body is appropriately foamed only after reaching the thermal expansion temperature. When heated at a high temperature for a long time, the expansion ratio increases, eventually resulting in over-foaming, resulting in collapse of cells and rough skin, making it difficult to maintain the strength required for the shoe body. It is desirable to adjust one or both of the heating temperature and the heating time so that the expansion ratio is 200% or less.

If the heating time is too long, the cells in which the heat-expandable microcapsules are thermally expanded may be crushed and the expansion ratio may be lowered. Therefore, the heating time should be limited to an appropriate expansion ratio. It is desirable to set it.

As described above, the heat-gelled substance of plastisol containing the polyvinyl chloride paste resin and the heat-expandable microcapsules is formed and foamed, and the wall thickness of the reinforcement-required part is the same as that of the other part. It is possible to manufacture the shoe main body of the foamed slush molded shoe according to the present invention as set forth in claim 1 in which the number is increased.

Thereafter, after cooling and demolding, a heel separately manufactured as one of the parts to be assembled is attached to the outer heel of the obtained shoe body by, for example, bonding, and then the shoe body is covered with the shoe cloth material. The sewn shoe is the final product by assembling the sewn back cloth and parts such as the insole and fasteners by sewing and adhering, and painting.

(9) Method for manufacturing foam slush molded shoe according to claim 9 In the second step of the method for manufacturing a foam slush molded shoe according to the present invention described in the above item (8), it is formed in the first step. After heating the semi-gelled material above the gelling temperature to below the thermal expansion temperature to proceed with gelation, heat the parts to be reinforced such as the toe, heel, and bottom below the thermal expansion temperature or above the thermal expansion temperature for a short time. At the same time, the other portions except the reinforcement required portion are heated to the thermal expansion temperature or higher, preferably for a short time. As heating conditions, a reinforcement required portion: 170 to 180
℃ × 2-3 minutes, other parts: 200-210 ℃ × 2
-3 minutes can be illustrated.

The means for heating by heating the heating conditions for the reinforcement-needed portion and the heating conditions for the other portions differently is not limited to a specific means. For example, heating may be performed by appropriately adjusting the arrangement and temperature of the heating device on the furnace wall of the heating furnace that heats the slush molded shoe mold having the inner surface of which the gelled product is formed.

Since the portion requiring reinforcement is heated below the thermal expansion temperature or above the thermal expansion temperature for a short time, it hardly foams,
On the other hand, the thermally expandable microcapsules are thermally expanded and foamed in the other portions.

By heating the reinforcing required portion and the other portion at different heating temperatures, the reinforcing required portion is non-foamed (foaming ratio: 100%) or low foamed (foaming ratio: over 100%). 200% or less) and the other parts are foamed to a foaming ratio of more than 100% and 200% or less, and the foaming ratio of all or a part of the reinforcement-needed part (for example, 120%) is expanded to the other part (for example, 120%). 18
0%). Therefore, the strength of the reinforcement-needed portion is further improved together with the large wall thickness. In this way, the shoe body of the foamed slush molded shoe according to the second aspect is manufactured.

After cooling and demolding, a heel separately manufactured as one of the parts to be assembled is attached to the outer heel of the shoe body by, for example, adhesion, and then sewn from the shoe cloth material to the shoe body. The slush molded shoe is the final product by assembling the lining cloth and parts such as the insole and fasteners by sewing and bonding and then painting.

(10) Method for manufacturing foam slush molded shoe according to claim 10 In the second step of the method for manufacturing a foam slush molded shoe according to the present invention as described in the above item (8) or (9),
Before heating the semi-gelated product formed in the first step to a temperature range not lower than the gelation temperature and lower than the thermal expansion temperature to proceed with gelation, a heel paste is injected into the inner heel of the semi-gelated product, This is a method of constructing a heel core by heating it above the gelling temperature. By this method, it is possible to further improve the bottom surface of the heel portion of the shoe body, which requires the highest strength and hardness. Hereinafter, this method will be described.

This heel paste is exactly the same as the heel paste described in detail in the foamed slush molded shoe according to claim 3 described in (3), and therefore the description thereof is omitted here.

The temperature of the injected heel paste is at room temperature or lower than room temperature, preferably 10
Inject below ℃.

After that, by the heating gelation in the second step (in some cases, together with the heating to the thermal expansion temperature or higher), the gel is formed into a heel core, and when the heating is performed to the thermal expansion temperature or higher in the second step. In addition, since this heel core is injected in a large amount to fill all the heel part and has a large heat capacity, it robs the amount of heat supplied to the heel part that is in contact with the heated gelled material of the shoe body, and the bottom surface of this heel part. Remarkably suppresses the temperature rise. Therefore, the temperature of the bottom surface of the heel portion will be suppressed as compared with the toe portion and the bottom portion, and the foaming ratio of the bottom surface of the heel portion is further suppressed as compared with the toe portion and the bottom portion among the reinforcement necessary portions, The strength of the bottom of the heel increases.

Thus, according to the method for producing a foamed slush molded shoe of the tenth aspect, a heel core made of a heated gelation product of the heel paste injected in the slush molding step is provided on the inner surface heel portion, It is possible to manufacture a shoe body in which the foaming ratio of the bottom surface of the heel part is smaller than the foaming ratio of the toe part and the bottom part.

Thereafter, after cooling and demolding, the back fabric sewn from the shoe backing material and the parts such as the insole and the fastener are assembled on the main body of the shoe by sewing and adhering, and the finished product is painted. Foam slush molding shoes.

In the method for manufacturing the foamed slush molded shoe, when the heel paste contains a hollow body having heat resistance, it is a heat gelation product of the history heel paste when the heel core having the same volume is formed. The weight of the heel core can be reduced. It is possible to add a foaming agent to the heel paste as a means to reduce the weight of the heel core, but the heel paste injected into the inner bottom surface of the semi-gelled product during foaming by heating expands in a convex shape. As a result, it may not be possible to maintain the predetermined shape of the heel core having a substantially straight upper surface. Further, when the heel paste contains a foaming inhibitor, there is a problem that foaming cannot be performed when the heel paste contains a foaming agent. If it is a hollow body, such a problem does not occur.

When the above-mentioned heel paste contains a foaming inhibitor, it is possible to further suppress the foaming ratio of the bottom surface of the heel portion of the shoe body with which the heel paste comes into contact, thereby further increasing the strength of the heel portion. You will be able to improve.

Since the hollow body and the foaming inhibitor are exactly the same as those described above, the description thereof is omitted here. Thus, when the heel paste contains a hollow body having heat resistance, the weight of the heel core is reduced, and when the heel paste contains a foaming inhibitor, the heel core is in contact with the bottom surface of the heel part. Further suppression of the expansion ratio can be achieved.

(11) Method for producing foam slush molded shoe according to claim 11 Before the first step of the method for producing foam slush molded shoe according to claim 8 to claim 10, a plastisol containing a polyvinyl chloride paste resin. The height required for the shoe body of the slush molded shoe inside the slush molded shoe mold,
Alternatively, the injection is performed up to a height including the above-mentioned necessary portion for reinforcement.

After the injection, the entire plastisol injected is heated to a temperature above the half-gelling temperature and below the gelling temperature and substantially uniformly for a short time. For example, the heating condition is 100 to 120 ° C × 10
30 seconds.

By heating in this manner, when the shoe-body-like and thin-film semi-gelled product is injected to the height required for the shoe body, the entire inner wall surface of the slush-molded shoe mold needs to be reinforced. In the case of injecting to a height including, a layer is formed on the lower part of the inner wall surface of the slush molding shoe mold. The thickness of the semi-gelated product to be formed is preferably 1 mm or less as described above.

After that, since the ungelled surplus plastisol remains inside the semi-gelated product, the surplus plastisol is treated by an appropriate means such as tilting the slush molding shoe mold. Slush molding Discharge to outside of shoe mold.

When plastisol is injected to a height required for the shoe main body to form a semi-gelled product on the entire inner wall surface of the slush molding shoe mold, the discharging means is not particularly limited. The molded shoe mold may be discharged by tilting it forward or sucking it with a suction device. However, when plastisol is injected to a height that includes the necessary reinforcement part to form a semi-gelled product on the lower part of the inner wall surface of the slush molding shoe mold, tilt the slush molding shoe mold backward to discharge excess plastisol. The excess ungelled sol flowing and discharged is brought into contact with the inner wall surface of the rear part of the slush molding shoe that is in a heated state, and the thin gelled semi-gelled product is also formed on the rear vertical wall surface of the upper half of the half gelled product. It is desirable to form a layer.

Hereinafter, heating of the plastisol containing the polyvinyl chloride paste resin and the heat-expandable microcapsules is carried out by slush molding the shoe body in exactly the same manner as in the method for manufacturing the foamed slush molded shoe according to claim 8 described above. It is composed of a gelled material and is foamed, and the wall thickness of the part requiring reinforcement is increased more than the wall thickness of the other part. Furthermore, non-foamed or low-foamed polyvinyl chloride is formed on all or part of the outer surface. A shoe body of a foamed slush molded shoe according to claim 4, wherein a skin skin layer made of a heat-gelled thin film of plastisol containing paste resin is formed.

Thereafter, after cooling and demolding, if the heel paste is not injected, a heel separately manufactured as one of the assembly parts is attached to the outer heel of the obtained shoe body by, for example, bonding. After that, the slush-molded shoe, which is the final product, is assembled by assembling the back cloth sewn from the shoe backing material and the parts such as the insole and the fastener with the shoe body by sewing and adhering, and painting.

(12) Foam slush molded shoe according to claim 12 A polyvinyl chloride paste resin is included before the first step of the method for producing a foam slush molded shoe according to any one of claims 8 to 10. Plastisol is injected in the required amount to cover all or part of the bottom inner surface of the slush molding shoe mold.

As the resin to be contained in the plastisol, cross-linkable polyvinyl chloride resin, copolymer resin, cross-linkable polyvinyl chloride resin and thermosetting plasticizer, thermosetting plasticizer and oil-resistant plasticizer, cross-linking poly A combination of vinyl chloride resin and oil resistant plasticizer, or crosslinkable polyvinyl chloride resin, thermosetting plasticizer and oil resistant plasticizer can be substituted.

In plastisol injection, the sole of the shoe has a substantially uniform thickness regardless of the site. For example, should the bottom of the slush-molding shoe mold be heated before injection so that it is injected as uniformly as possible? Alternatively, after the injection, the bottom of the slush-molding shoe mold is heated and tilted to at least one of the toe side and the heel side at least one or more times so that the heat-gelated product is the entire inner surface of the bottom of the slush-molding shoe mold or It may be attached so as to cover a part of it, or the whole or part of the bottom of the slush molding shoe mold may be heated or heated to a temperature at which the plastisol to be injected is thickened or gelation proceeds, Is a slush molded shoe mold that is tilted at least one or more times on at least one of the toe side and the heel side, and is injected in an amount necessary for molding the sole. And the it is desirable to perform the injection of such deposit the heated gelled so as to cover all or part of the inner surface of the bottom portion of the slush molding shoe mold.

By injecting plastisol in this way, the plastisol injected into the bottom of the inner surface of the slush molding shoe mold is heated to, for example, 150 to 160 ° C.
By heating for 1 to 2 minutes, a shoe sole-like semi-gelled product is formed along all or part of the inner surface of the bottom of the slush molding shoe mold.

Hereinafter, the plastisol containing the polyvinyl chloride paste resin and the heat-expandable microcapsules is heated by slush-molding the shoe body in exactly the same manner as in the method for manufacturing the foamed slush-molded shoe according to claim 8 described above. It is composed of a gelled material and is foamed, and the wall thickness of the part requiring reinforcement is increased more than the wall thickness of other parts, and the non-foamed or low foamed poly is formed on all or part of the outer surface of the bottom surface. 6. A shoe sole made of a heated gelation product of plastisol containing a vinyl chloride paste resin is formed, and the wall thickness of the toe part and the heel part of the reinforcement-requiring part is made larger than the wall thickness of the bottom part. The shoe body of the foam slush molded shoe can be manufactured.

Thereafter, after cooling and demolding, if the heel paste is not injected, a heel separately manufactured as one of the assembly parts is attached to the outer heel of the obtained shoe body by, for example, bonding. After that, the slush-molded shoe, which is the final product, is assembled by assembling the back cloth sewn from the shoe backing material and the parts such as the insole and the fastener with the shoe body by sewing and adhering, and painting.

(13) Foam slush molded shoe according to claim 13 The first method for producing a foam slush molded shoe according to claim 11.
Before the step and before injecting the plastisol forming the skin skin layer, plastisol containing polyvinyl chloride paste resin is injected into all or part of the inner bottom of the slush molding shoe mold and heated, or By discharging a plastisol in a non-gelling state by forming a semi-gelled product that becomes a skin layer, plastisol containing polyvinyl chloride paste resin is injected into all or part of the inner bottom of the semi-gelated product and heated. A slush molding shoe mold or a semi-gelled shoe bottom-like semi-gelled material is layered on all or a part of the inner bottom.

In the following, the plastisol containing the polyvinyl chloride paste resin and the heat-expandable microcapsules is heated by slush-molding the shoe body in exactly the same manner as in the method for manufacturing the foamed slush-molded shoe according to claim 8 described above. It is composed of a gelled material and is foamed, and the wall thickness of the part requiring reinforcement is increased more than the wall thickness of other parts, and the non-foamed or low foamed poly is formed on all or part of the outer surface of the bottom surface. A shoe sole made of a heated gel of plastisol containing vinyl chloride paste resin is formed, and the thickness of the toe and heel of the necessary reinforcement portion is increased more than that of the bottom. Non-foamed or low-foamed polychlorinated on all or part of the outer surface of the bottom of the layer, or on all or part of the bottom between the shoe body and the skin skin layer. With the sole is formed consisting of heating gelled plastisol containing a nil paste resin,
It is possible to manufacture a foam slush molded shoe in which the wall thicknesses of the toe part and the heel part of the reinforcement-required part are made larger than the wall thickness of the bottom part.

Thereafter, after cooling and demolding, if the heel paste is not injected, a heel separately manufactured as one of the assembly parts is attached to the outer heel of the obtained shoe body by, for example, bonding. After that, the slush-molded shoe, which is the final product, is assembled by assembling the back cloth sewn from the shoe backing material and the parts such as the insole and the fastener with the shoe body by sewing and adhering, and painting.

(14) Foamed slush molded shoe according to claim 14 In the present invention, the shoe body was foamed by incorporating heat-expandable microcapsules in plastisol. However, a foaming agent is used in combination with the heat-expandable microcapsules. Good. The type of foaming agent has been described in the item (7), and thus the description thereof is omitted here.

Since the cost increase can be suppressed and the expansion ratio of the shoe body after foaming can be further stabilized by containing the foaming agent, it is desirable to use the foaming agent together with the heat-expandable microcapsules.

[0186]

EXAMPLES Further, the foam slush molded shoe and the method for producing the same according to the present invention will be described in detail with reference to Examples, but this is an example of the present invention and the present invention is not limited thereto. .

(Example 1) A foam slush molded shoe was manufactured by the method for manufacturing a foam slush molded shoe according to the present invention.

[0188]

[Table 1]

First, a plastisol mainly composed of a polyvinyl chloride paste resin having the composition shown in Table 1 and containing no foaming agent was injected into the inside of a slush molding shoe mold up to the upper end opening and the whole was 100 ° C. × 10 to 30. By heating under a heating condition for 2 seconds, a semi-gelled thin film in the form of a shoe body with a thickness of about 0.2 mm is formed as a skin layer on the inner wall surface of the slush molding shoe mold. The surplus ungelled plastisol remaining on the inner surface of the gelled product was discharged from the upper end opening by tilting the slush molding shoe mold.

[0190]

[Table 2]

Next, a plastisol containing a polyvinyl chloride paste resin having the composition shown in Table 2 was injected so as to cover the entire inner surface of the bottom of the slush molding shoe mold, and heated so that the entire inner surface of the bottom was covered. A 2 mm thick semi-gelled material was formed as the sole.

At the time of this heating, although not shown, the slush molding shoe mold is tilted forward and backward by an appropriate angle three times so that the injected plastisol has a substantially uniform thickness on the entire inner surface of the bottom. So formed.

[0193]

[Table 3]

Next, plastisol containing polyvinyl chloride paste resin having the composition shown in Table 3 and heat-expandable microcapsules was poured into the slush molding shoe mold up to the upper end opening, and the toe part, heel part and bottom part were filled. Other parts of the shoe body, except for the part requiring reinforcement, such as the boots and tube, under the heating conditions of 100 ° C x 4 minutes.
By heating at 100 ° C. for 2 minutes,
Shoe-molded semi-gelled product with the thickness of the required reinforcement portion being about 2.0 mm and the thickness of the other portions being about 1.0 mm is used as the shoe body to form a layer on the inner wall surface of the slush molded shoe mold. Then, the surplus ungelled plastisol remaining on the inner surface of this semi-gelated product was discharged from the upper end opening while tilting the slush molding shoe mold.

[0195]

[Table 4]

Next, the heel paste A having the composition shown in Table 4 was injected and filled into the concave portion forming the inner surface heel of the semi-gelated product, and the above-mentioned necessary reinforcement portion was heated at 170 ° C. for 3 minutes. By heating the other parts under heating conditions of 160 ° C. for 3 minutes, the semi-gelled product was heated to a gelled product.

Next, this heated gelled product is heated under the heating condition of 200 ° C. for 3 minutes so that the entire heated gelled product is foamed substantially uniformly, and then cooled at room temperature for 6 minutes, and then from the slush molding shoe mold. The foamed slush molded shoe according to claim 6 was manufactured by extracting.

[0198]

[Table 5]

A shoe body made of a heat-gelated plastisol containing the polyvinyl chloride paste resin and heat-expandable microcapsules foamed by heat expansion by heating,
As can be seen from the foaming ratio of each part of the shoe body shown in Table 5, the reinforcement-requiring portion and the other portion are foamed substantially uniformly, and the wall thickness of the reinforcement-requiring portion is larger than that of the other portion.

Therefore, the shoe body is lightweight as a whole and the strength of the portion requiring reinforcement is maintained. Also,
Since each part of the shoe body was foamed by the thermal expansion of the thermally expandable microcapsules, the heat insulating property was excellent and the cushion property (comfort) was also good. Further, foaming due to thermal expansion imparts a leather pattern-like small wrinkle in the kerf-like shape to the surface of the shoe body, which makes it possible to improve the sense of quality of the conventional slush-molded shoes having a smooth surface. Furthermore, since the heel core is formed by injecting and heating the heel paste before gelling, which is the slush molding process, the foaming ratio of the bottom surface of the heel of the shoe body with which the heel paste comes in contact with the toe portion, Compared to the bottom, it can be kept small, and the heel of the shoe body, where the wear resistance is most required, can be increased.

In this example, a high temperature foaming type manufactured by Matsumoto Yushi Co., Ltd. was used as the heat-expandable microcapsules. The thermal expansion of the high temperature foaming type starts at about 160 ° C and the thermal expansion temperature is about 190 ° C.

In the heat gelation process of the shoe body described above, when heating the semi-gelated product, a large amount of heat is required because the necessary reinforcement portions such as the toe part, the heel part and the bottom part are thick. Therefore, if it is heated from the beginning under a high temperature / long time heating condition, an excessive amount of heat is received until sufficient gelation occurs, resulting in excessive foaming or roughening of the surface of the shoe body.

Therefore, in this embodiment, the other parts (thinners, cylinders, etc.) having a small wall thickness are heated under a relatively low temperature heating condition of 160 ° C. × 3 minutes because the amount of heat required for gelation is small. On the other hand, since the portion requiring reinforcement having a large wall thickness requires a large amount of heat for gelation, foaming by heating at a relatively high temperature of 170 ° C x 3 minutes in the temperature range below the thermal expansion temperature After allowing gelation to proceed without heating, heating at 200 ° C., which is higher than the thermal expansion temperature, for a short time of 3 minutes prevented excessive foaming.

Further, in this embodiment, since the outer surface of the shoe body is entirely covered with the thin film skin skin layer, the surface of the shoe body can be protected and the resistance to scratches and the like can be improved. .

Further, in this example, since the plastisol containing the polyvinyl chloride paste resin having the composition shown in Table 2 was used for the shoe sole, the abrasion resistance of the shoe sole could be improved.

(Example 2) A foam slush molded shoe was manufactured by the method for manufacturing a foam slush molded shoe according to the present invention.

First, a plastisol mainly composed of polyvinyl chloride paste resin having the composition shown in Table 1 and containing no foaming agent was injected into the inside of a slush molding shoe mold up to the upper end opening, and the whole was 100 ° C. × 10 to 30. By heating under a heating condition for 2 seconds, a thin gel-like semi-gelled product with a thickness of about 0.2 mm is layered on the inner wall surface of the slush molding shoe mold, and the inner surface of this semi-gelated product is formed. The surplus ungelled plastisol remaining in 1 was discharged from the upper end opening by tilting the slush molding shoe mold.

Next, a plastisol containing the polyvinyl chloride paste resin having the composition shown in Table 2 is poured so as to cover the entire inner surface of the bottom of the slush molding shoe mold, and heated to cover the entire inner surface of the bottom. A 2-3 mm thick hot gelate was formed along it.

During this heating, the slush molding shoe mold was tilted forward and backward three times at an appropriate angle to form the injected plastisol so that the entire inner surface of the bottom had a substantially uniform thickness. .

Next, plastisol containing polyvinyl chloride paste resin having the composition shown in Table 3 and heat-expandable microcapsules was poured into the slush molding shoe mold up to the upper end opening to the toe, heel and bottom. Other parts of the shoe body, except for the part requiring reinforcement (crawler part, tubular part, etc.), under the heating conditions of 100 ° C x 6 minutes.
By heating at 100 ° C. for 2 minutes,
A semi-gelated product in the form of a shoe body with the thickness of the required reinforcement portion being about 3 mm and the thickness of the other portion being about 1 mm is layered on the inner wall surface of the slush molding shoe mold. The surplus ungelled plastisol remaining on the inner surface was discharged from the upper end opening while tilting the slush molding shoe mold.

Next, a heel paste B having a composition containing a hollow body having heat resistance shown in Table 4 is injected and filled into the concave portion forming the inner surface heel portion of the semi-gelated product, and the above-mentioned reinforcing required portion is 170 Under heating conditions of ℃ × 3 minutes, other parts 1
The semi-gelated product was heated to a gelled product by heating at 60 ° C. for 3 minutes.

Subsequently, the part of the heated gelled material that is required to be reinforced is heated under the heating condition of 180 ° C. × 2 minutes, and the other part of the heated gelled material is heated to 200 ° C. × 2.
The shoe main body of the foamed slush molded shoe according to claim 6 was manufactured by heating under a heating condition of 1 minute and then cooling at room temperature for 6 minutes and then withdrawing from the slush molded shoe mold.

[0213] The shoe body made of the heat-gelated plastisol containing the polyvinyl chloride paste resin and the thermally expandable microcapsules foamed by thermal expansion needs to be reinforced as shown in Table 6 from the expansion ratio of each part of the shoe body. The parts are low and the other parts are foamed with a high expansion ratio, and the wall thickness of the part requiring reinforcement is larger than the wall thickness of the other parts.

[0214]

[Table 6]

Therefore, this shoe main body is lightweight as a whole, and the strength of the portion requiring reinforcement is kept extremely sufficient. Further, since each part of the shoe main body was foamed by the thermal expansion of the thermally expandable microcapsules at the expansion ratio shown in Table 6, the heat insulating property was excellent and the cushioning property (comfort) was also good. In addition, the foaming imparts leather pattern-like small wrinkles on the surface of the shoe body, which makes it possible to improve the quality of the conventional slush molded shoe having a smooth surface. In addition, since the heel core is formed by injecting and heating the heel paste before heat gelation, which is the slush molding process, the foaming ratio of the bottom of the heel of the shoe body with which the heel paste comes into contact is set to the toe part. It was possible to reduce the size compared to the bottom part, etc., and to increase the strength of the bottom surface of the heel part of the shoe body where the wear resistance is most required. Further, the heel core, which is a heated gelled product of the paste for heel, is lightweight because it includes a hollow body, and the weight of the shoe body can be further promoted.

Further, in this embodiment, since the outer surface of the shoe body is entirely covered with the thin film skin skin layer, the surface of the shoe body can be protected and the resistance to scratches and the like can be improved. .

Furthermore, in this example, since the plastisol containing the polyvinyl chloride paste resin having the composition shown in Table 1 was used for the shoe sole, the abrasion resistance of the shoe sole could be improved.

(Example 3) In Example 1, the liquid temperature of the heel paste at the time of pouring was suppressed to 5 ° C, which was not higher than room temperature, and the heat-expandable microcapsules contained in the plastisol constituting the shoe body were used. A foamed slush molded shoe was manufactured in the same manner as in Example 1 except that the weight part was used. Table 7 shows the expansion ratio of each part of the shoe body.

[0219]

[Table 7]

[0220] When the liquid temperature of the heel paste is suppressed in this way, when the semi-gelated product layered on the inner wall surface of the slush molding shoe is poured into the concave portion of the inner heel,
As the heel temperature decreases, the heel paste absorbs the amount of heat supplied to the heel by heating during the subsequent heat gelation, and the heel paste absorbs the temperature rise of the shoe body. Remarkably suppress.

Therefore, the toe portion and the bottom portion of the reinforcement-required portion and the other portions such as the mouth opening portion and the tubular portion are
A good foaming state was obtained, and the bottom surface of the heel portion of the portion requiring reinforcement could have an extremely low foaming ratio. Therefore, it is possible to manufacture a foamed slush molded shoe in which the strength of the bottom surface of the heel portion of the shoe body, which requires the most wear resistance, is increased.

(Example 4) A foam slush molded shoe was manufactured by the method for manufacturing a foam slush molded shoe according to the present invention. First, plastisol mainly composed of polyvinyl chloride paste resin having the composition shown in Table 1 and containing no foaming agent was injected into the inside of a slush molding shoe mold up to the upper end opening, and the whole was heated at 100 ° C for 10 to 30 seconds. By heating under the conditions, a thin film-like semi-gelled product having a thickness of about 0.2 mm in the form of a shoe body is layered on the inner wall surface of the slush molding shoe mold, and remains on the inner surface of this semi-gelated product. The surplus ungelled plastisol was discharged from the upper end opening by tilting the slush molding shoe mold.

Next, plastisol containing the polyvinyl chloride paste resin having the composition shown in Table 2 is poured so as to cover the entire inner surface of the bottom of the slush molding shoe mold, and heated to cover the entire inner surface of the bottom. A 2-3 mm thick hot gelate was formed along it.

At the time of this heating, although not shown, the slush molding shoe mold is tilted forward and backward three times at an appropriate angle so that the injected plastisol has a substantially uniform thickness on the entire inner surface of the bottom. So formed.

Next, a plastisol containing a polyvinyl chloride paste resin and a foaming agent having the same composition as shown in Table 3 except that the content of the heat-expandable microcapsules was 5 parts by weight was added to a slush molded shoe mold. The inside of the shoe is injected to the top opening, and the toe, heel, bottom, and other parts that require reinforcement are heated at 100 ° C for 6 minutes. Part) is heated under the heating condition of 100 ° C x 2 minutes to slash the semi-gelated product in the shape of a shoe body where the thickness of the required reinforcement part is about 3 mm and the thickness of the other part is about 1 mm. A layer was formed on the inner wall surface of the molded shoe mold, and the surplus ungelled plastisol remaining on the inner surface of the semi-gelated product was discharged from the upper end opening by tilting the slush molded shoe mold.

Next, a heel paste B having a composition containing a hollow body having heat resistance shown in Table 4 is injected and filled into the concave portion forming the inner surface heel portion of this semi-gelated product, and the above-mentioned reinforcing necessary portion is 170 Under heating conditions of ℃ × 3 minutes, other parts 1
The semi-gelated product was heated to a gelled product by heating at 60 ° C. for 3 minutes.

Subsequently, the portion of the heated gelled material which is required to be reinforced is heated under the heating condition of 170 ° C. × 4 minutes, and the other portion of the heated gelled material is heated to 200 ° C. × 2.
The slush-molded shoe according to claim 6 was manufactured by heating the slush-molded shoe under a heating condition of 1 minute and then cooling it at room temperature for 6 minutes and then removing it from the slush-molded shoe mold. Table 8 shows the expansion ratio of each part of the shoe body.

[0228]

[Table 8]

The shoe body made of the heat-gelated plastisol containing the polyvinyl chloride paste resin and the heat-expandable microcapsules had a low reinforcement requirement as shown in Table 8 and the other parts. Is foamed with a high expansion ratio, and the wall thickness of the part requiring reinforcement is configured to be larger than the wall thickness of other parts.

Therefore, the shoe body as a whole is lightweight, and the strength of the portion requiring reinforcement is kept extremely sufficient. Further, since each part of the shoe body was foamed at the foaming ratio shown in Table 8, the heat insulating property was excellent and the cushioning property (wearing comfort) was also good. Further, the foaming imparts a leather pattern-like small wrinkle on the surface of the shoe body, which makes it possible to improve the high-class feeling of the conventional slush-molded shoe on the smooth surface. Further, in this embodiment, since the outer surface of the shoe body is entirely covered with the thin film skin layer, the surface of the shoe body can be protected and the resistance to scratches and the like can be improved. Further, since the heel core is formed by injecting and heating the heel paste before gelling, which is the slush molding process, the foaming ratio of the bottom surface of the heel part of the shoe body with which the heel paste comes in contact with the toe part, Compared to the bottom part, it can be suppressed to a smaller size, and the strength of the bottom surface of the heel part of the shoe body, where wear resistance is most required, can be increased. In addition, the heel core, which is a heat-gelated product of this heel paste, is lightweight because it includes a hollow body, and the weight of the shoe body can be further promoted.

(Example 5) In Example 4, the shoe sole was made of a heat-gelated substance of plastisol A or B containing a crosslinkable polyvinyl chloride resin having the composition shown in Table 9, and foam slush molding according to the present invention was carried out. Shoes.

[0232]

[Table 9]

The foam slush molded shoes according to the present invention were visually compared in appearance quality. The sole of the slush-molded shoe according to the present invention has a constant thickness of about 3 mm regardless of the part, and can be molded to have a uniform thickness according to the shape of the sole.

Further, the strength, abrasion resistance, cigarette resistance (heat resistance) and oil / chemical resistance of the sole of the foamed slush molded shoe according to the present invention were evaluated as follows. (Strength) Tensile strength, elongation, and tear strength were measured using a Shopper-type tensile tester based on JIS K-6301. (Abrasion resistance) Wearing wheel CS-1 by Taber abrasion tester
The wear loss at 1000 revolutions was measured by 0. (Cigarette resistance) A JIS K-6301 No. 1 test piece was cut out from the shoe sole and hung in an oven at 180 ° C for 5 minutes, and the presence or absence of melt drop and the elongation rate when it did not drop were measured.

In addition, the two slush-molded shoes produced were used to actually step on the cigarette to extinguish the fire and melt the sole of the shoe.
The deformed state was confirmed. (Oil resistance to chemicals) JIS No. 3 oil and vegetable oil (soybean oil) were used to measure the weight change when immersed at 40 ° C. for 96 hours.

The results for plastisols A and B are shown in Table 1.
0 is shown collectively. The slush-molded shoe molded according to the present invention has the same strength, hardness and flexibility of the shoe body as a conventional slush-molded shoe, and the sole has a heat deformation resistance (cigarette resistance) more than ever before. It can be seen that the excellent properties, the tensile strength, the oil resistance and the chemical resistance are improved, and the various properties of the sole are improved.

[0237]

[Table 10]

(Example 6) As shown in Table 9, Example 5
In the above, a cross-linkable polyvinyl chloride plastisol, which is a raw material for shoe soles, is mixed with whiskers (manufactured by Shikoku Kasei Kogyo Co., Ltd.) as an anti-slip material, and multilayered by the production method according to the present invention in exactly the same manner as in Example 5. A slush molded shoe consisting of

Regarding the obtained foam slush molded shoes,
The slip resistance was evaluated as follows. (Anti-slip) Put the shoes on P tile, vinyl flooring and ice respectively, pull vertically with a vertical load of 10 kgf,
The stress at startup was measured.

The results are shown in Table 10. In addition to the results of Example 1, it can be seen that the foamed slush molded shoe according to the present invention is excellent in slip resistance in addition to the effects of Example 5.

Example 7 As shown in Table 9, Example 5
In Example 6, the pigment mixed with the plastisol containing the crosslinkable polyvinyl chloride resin, which is the raw material for the sole, was reduced to 0.1 parts by weight of the organic crepe color-tone pigment: Manufactured.

The plastisol in which the first layer of the crosslinkable polyvinyl chloride resin constituting the shoe sole is mixed due to the reduced amount of pigment, and thus has peculiar transparency, so that the inner surface of the slush molded shoe mold by the first injection is The slush-molded shoes with excellent appearance quality could be manufactured by the second injection without repairing the adhesion.

(Example 8) In Example 4, the shoe sole was made of a heat-gelated substance of plastisol containing a crosslinkable polyvinyl chloride resin having the composition shown in Table 11 and a thermosetting plasticizer, and the present invention was applied. Foam slush molded shoes.

[0244]

[Table 11]

The foam slush molded shoes according to the present invention were visually compared in appearance quality. The shoe sole of the foamed slush molded shoe according to the present invention has a sole length of 3 m regardless of the part.
It has a constant thickness of about m and can be formed into a uniform thickness according to the shape of the bottom.

Further, the strength, abrasion resistance, cigarette resistance (heat resistance), and oil resistance and chemical resistance of the sole of the foamed slush molded shoe according to the present invention were evaluated by the above-mentioned methods.

The results are summarized in Table 12. The foamed slush molded shoe molded according to the present invention has the same strength, hardness and flexibility of the shoe body as a conventional slush molded shoe, and the sole is more heat-deformable (cigarette resistant) than ever before. It can be seen that the excellent properties of the shoe sole are improved by improving the tensile strength and oil / chemical resistance.

[0248]

[Table 12]

(Example 9) As shown in Table 11, in Example 8, whiskers (manufactured by Shikoku Kasei Kogyo Co., Ltd.) as a slip-proof material were mixed with crosslinkable polyvinyl chloride plastisol, which is a raw material for shoe soles. Then, a foamed slush molded shoe according to the present invention was manufactured in exactly the same manner as in Example 8. The obtained slush molded shoes were evaluated for slip resistance in the same manner as in Example 6.

The results are shown in Table 12. Together with the results of Example 8, it can be seen that the foamed slush molded shoe according to the present invention has excellent slip resistance.

(Example 10) As shown in Table 11, in Examples 8 and 9, a pigment mixed in a plastisol containing a crosslinkable polyvinyl chloride resin and a thermosetting plasticizer, which are raw materials for shoe soles. The organic crepe toning pigment:
A foamed slush molded shoe was manufactured in the same manner by reducing the amount to 0.1 part by weight.

The plastisol in which the first layer of the crosslinkable polyvinyl chloride resin and the thermosetting plasticizer, which constitute the shoe sole due to the reduced amount of pigment, is mixed and becomes transparent, and the slush molding shoe mold by the first injection is formed. The foamed slush molded shoe with excellent appearance quality could be manufactured by the second injection without reworking the inner surface of the shoe.

(Example 11) In Example 4, the shoe sole was made of a heat-gelated plastisol gel composition containing a thermosetting plasticizer and an oil-resistant plasticizer having the compositions shown in Table 13 to give a foamed slush according to the present invention. Molded shoes.

[0254]

[Table 13]

The foam slush molded shoes according to the present invention were visually compared in appearance quality. The shoe sole of the foamed slush molded shoe according to the present invention has a sole length of 3 m regardless of the part.
It has a constant thickness of about m, and can be formed into a uniform thickness according to the shape of the shoe sole.

Further, the strength, abrasion resistance, cigarette resistance (heat resistance), and oil resistance and chemical resistance of the sole of the foamed slush molded shoe according to the present invention were evaluated by the above-mentioned methods.

The results are summarized in Table 14. The slush-molded shoe molded according to the present invention has the same strength, hardness and flexibility of the shoe body as a conventional slush-molded shoe, and the sole has a heat deformation resistance (cigarette resistance) more than ever before. It can be seen that the excellent properties, the tensile strength, the oil resistance and the chemical resistance are improved, and the various properties of the sole are improved.

[0258]

[Table 14]

(Example 12) As shown in Table 13, in Example 11, a plastisol containing a thermosetting plasticizer and an oil-resistant plasticizer, which are raw materials for shoe soles, was used as whiskers (Shikoku Kasei Kogyo ( (Manufactured by Co., Ltd.) was mixed and the foamed slush molded shoe according to the present invention was manufactured in exactly the same manner as in Example 11. The resulting foamed slush molded shoe was evaluated for slip resistance in exactly the same manner as in Example 6.

The results are shown in Table 14. Together with the results of Example 11, the foam slush molded shoe according to the present invention,
It can be seen that the slip resistance is also excellent.

(Example 13) As shown in Table 13, in Examples 11 and 12, the pigment mixed in the plastisol containing the thermosetting plasticizer and the oil resistant plasticizer, which is the raw material for the shoe sole, was mixed with the organic pigment. System crepe color tone pigment: A foamed slush molded shoe was manufactured in the same manner by reducing the amount to 0.1 part by weight.

The plastisol containing the thermosetting plasticizer and the oil resistant plasticizer of the first layer, which constitutes the sole due to the reduction of the pigment, becomes colored and transparent, and the inner surface of the slush molded shoe mold by the first injection is formed. A foamed slush molded shoe with excellent appearance quality could be manufactured by the second injection without repairing the adhesion.

(Example 14) In Example 4, the shoe sole was made of a heat-gelated substance of plastisol containing a crosslinkable polyvinyl chloride resin having the composition shown in Table 15 and an oil resistant plasticizer, and foamed according to the present invention. Slash molded shoes.

[0264]

[Table 15]

The foam slush molded shoes according to the present invention were visually compared in appearance quality. The shoe sole of the foamed slush molded shoe according to the present invention has a sole length of 3 m regardless of the part.
It has a constant thickness of about m, and can be formed into a uniform thickness according to the shape of the shoe sole.

Furthermore, the strength, abrasion resistance, cigarette resistance (heat resistance), and oil resistance and chemical resistance of the sole of the foamed slush molded shoe according to the present invention were evaluated by the aforementioned methods.

The results are summarized in Table 16. The foamed slush molded shoe according to the present invention has the same strength, hardness and flexibility of the shoe body as a conventional slush molded shoe, and the shoe sole is particularly excellent in heat deformation resistance (cigarette resistance) as compared with the conventional shoe. It can be seen that the tensile strength and the oil and chemical resistance are improved, and the various properties of the sole are improved.

[0268]

[Table 16]

(Example 15) As shown in Table 15, in Example 11, whiskers (manufactured by Shikoku Chemical Industry Co., Ltd.) were mixed with the crosslinkable polyvinyl chloride plastisol, which is a raw material for shoe soles, as a non-slip material. In the same manner as in Example 11, a foam slush molded shoe according to the present invention was manufactured.
The resulting foamed slush molded shoe was evaluated for slip resistance in exactly the same manner as in Example 6.

The results are shown in Table 16. Together with the results of Example 14, the foam slush molded shoe according to the present invention,
It can be seen that the slip resistance is also excellent.

(Example 16) As shown in Table 15, in Examples 14 and 15, the pigments mixed in the plastisol containing the crosslinkable polyvinyl chloride resin and the oil resistant plasticizer, which are the raw materials for the shoe sole, were used. Organic crepe color-tone pigment: Reduced to 0.1 part by weight, and similarly foamed slush molded shoes were manufactured.

The plastisol mixed with the first layer of the crosslinkable polyvinyl chloride resin and the oil-resistant plasticizer, which constitutes the sole for reducing the pigment, becomes colored and transparent, and becomes a slush molded shoe mold by the first injection. The second injection made it possible to manufacture foamed slush molded shoes with excellent appearance quality without repairing the adhesion on the inner surface.

(Example 17) In Example 4, the shoe sole was composed of a heat-gelated substance of plastisol containing a cross-linkable polyvinyl chloride resin having the composition shown in Table 17, a thermosetting plasticizer and an oil resistant plasticizer. The foamed slush molded shoe according to the present invention.

[0274]

[Table 17]

The foam slush molded shoes according to the present invention were visually compared in appearance quality. The shoe sole of the foamed slush molded shoe according to the present invention has a sole length of 3 m regardless of the part.
It has a constant thickness of about m, and can be formed into a uniform thickness according to the shape of the shoe sole.

Furthermore, the strength, abrasion resistance, cigarette resistance (heat resistance), and oil resistance and chemical resistance of the sole of the foamed slush molded shoe according to the present invention were evaluated by the above-mentioned methods.

The results are summarized in Table 18. The foamed slush molded shoe molded according to the present invention has the same strength, hardness and flexibility of the shoe body as a conventional slush molded shoe, and the sole is more heat-deformable (cigarette resistant) than ever before. It can be seen that the excellent properties of the shoe sole are improved by improving the tensile strength and oil / chemical resistance.

[0278]

[Table 18]

(Example 18) As shown in Table 17, in Example 17, whiskers (manufactured by Shikoku Kasei Kogyo Co., Ltd.) were mixed as a non-slip material with the crosslinkable polyvinyl chloride plastisol, which was the raw material for the soles. In the same manner as in Example 17, a foamed slush molded shoe according to the present invention was manufactured.
The resulting foamed slush molded shoe was evaluated for slip resistance in exactly the same manner as in Example 6.

The results are shown in Table 18. Together with the results of Example 17, the foam slush molded shoe according to the present invention,
It can be seen that the slip resistance is also excellent.

(Example 19) As shown in Table 17, in Examples 17 and 18, a plastisol containing a crosslinkable polyvinyl chloride resin which is a raw material for shoe soles, a thermosetting plasticizer and an oil resistant plasticizer. The slush molded shoe was manufactured in the same manner by reducing the amount of the pigment mixed in (1) to an organic crepe color tone pigment: 0.1 part by weight.

The plastisol containing the crosslinkable polyvinyl chloride resin, the thermosetting plasticizer and the oil resistant plasticizer of the first layer which constitutes the sole due to the reduction of the pigment becomes colored and transparent,
By the second injection, a foamed slush molded shoe with excellent appearance quality could be manufactured without repairing the adhesion of the inner surface of the slush molded shoe mold by the first injection.

(Example 20) In Example 4, the shoe sole was made of a heat-gelated substance of plastisol containing the copolymer resin having the composition shown in Table 19 to obtain a foam slush molded shoe according to the present invention.

[0284]

[Table 19]

The foam slush molded shoes according to the present invention were visually compared in appearance quality. The shoe sole of the foamed slush molded shoe according to the present invention has a sole length of 3 m regardless of the part.
It has a constant thickness of about m, and can be formed into a uniform thickness according to the shape of the shoe sole.

Strength, abrasion resistance, cigarette resistance (heat resistance) and oil resistance and chemical resistance of the sole of the foamed slush molded shoe according to the present invention were evaluated by the above-mentioned methods.

Further, the adhesion strength between the shoe body and the sole of the foamed slush molded shoe according to the present invention was evaluated by the following method. (Adhesion strength) Adhesion strength was measured by performing a strip-shaped peeling test based on JIS K 6301.

The results are summarized in Table 20. The foamed slush molded shoe molded according to the present invention has the same strength, hardness and flexibility of the shoe body as a conventional slush molded shoe, and the sole is more heat-deformable (cigarette resistant) than ever before. It can be seen that the tensile strength, the oil resistance and the chemical resistance, and the adhesion strength with the shoe body are improved, and various properties of the sole are improved.

[0289]

[Table 20]

(Example 21) As shown in Table 19, in Example 20, whiskers (manufactured by Shikoku Kasei Co., Ltd.) as a slip-proof material were mixed with plastisol containing a copolymer resin as a material for shoe soles. A foamed slush molded shoe according to the present invention was manufactured in exactly the same manner as in Example 20.
The resulting foamed slush molded shoe was evaluated for slip resistance in exactly the same manner as in Example 6.

The results are shown in Table 20. Together with the results of Example 20, the foam slush molded shoe according to the present invention is
It can be seen that the slip resistance is also excellent.

(Example 22) As shown in Table 19, in Examples 20 and 21, the pigment mixed with the plastisol containing the copolymer resin as the material for the shoe sole was mixed with the organic crepe color-tone pigment: 0. A foamed slush molded shoe was manufactured in the same manner by reducing the amount to 1 part by weight.

The plastisol containing the copolymer resin of the first layer, which constitutes the sole due to the reduced amount of pigment, becomes colored and transparent, and the plastisol having the first injection does not require reworking to adhere to the inner surface of the slush molded shoe mold. By the second injection, a foam slush molded shoe with excellent appearance quality could be manufactured.

Example 23 In each example, 0.3 parts by weight of azodicarbonamide was added as a foaming agent to plastisol containing 2 parts by weight of polyvinyl chloride paste resin and heat-expandable microcapsules constituting the shoe body. Then, a foam slush molded shoe was manufactured using the heel paste C shown in Table 4.

As a result, it was possible to stably produce a foam slush molded shoe which is light in weight, has a foaming ratio of 150%, is extremely stable even after foaming, is lightweight, and is inexpensive.

In this example, azodicarbonamide (ADCA) was used as a foaming agent, and a composite additive of Zn and Ba was used as a stabilizer. The blowing agent decomposition temperature of the blowing agent azodicarbonamide is 195 ° C, but since Zn promotes foaming as described above, the blowing agent azodicarbonamide foams at about 180 ° C in plastisol. In addition, since this plastisol contains a foam suppressor, the heel of the shoe body should be sandwiched from above and below by the heel core and the sole containing both foam suppressor when the shoe body is heated and foamed. It was possible to suppress foaming on the bottom surface of the heel.

Further, since the heel paste contains a foaming suppressor, the inner surface heel portion of the semi-gelled product with which the heel paste comes into contact loses heat to the heel paste and causes a temperature increase to occur at other parts. Further, the foaming ratio is extremely suppressed by the synergistic effect of being suppressed further and the foaming inhibitor suppressing foaming. Therefore, the heel part 2 of the shoe body
The strength of No. 6 can be sufficiently ensured, which is almost equal to that of non-foaming.

[0298]

According to the first aspect of the present invention, the foamed slush molded shoe has a shoe body composed of a heat-gelated substance of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules, and the shoe body is foamed. Since the wall thickness of the toe, heel, bottom, and other parts that require reinforcement is greater than the wall thickness of other parts of the shoe body excluding the parts that require reinforcement, the overall weight is light and the parts that require reinforcement are Strength is maintained by its thickness. Further, since each part of the shoe main body is foamed, it has excellent heat insulating properties and also good cushioning properties (comfort). Further, the foaming imparts a leather pattern-like calf-like wrinkle to the surface of the shoe body, thereby improving the sense of quality.

A foam slush molded shoe according to a second aspect of the present invention is the foam slush molded shoe according to the first aspect, in which all or some of the necessary reinforcement portions have a foaming ratio smaller than the foaming ratio of the other portion. Therefore, it is light in weight as a whole, and the strength of the portion requiring reinforcement is sufficiently maintained.

A foam slush molded shoe according to claim 3 is
The foamed slush molded shoe according to claim 1 or 2, wherein the shoe body has a heel core made of a heat-gelled paste of heel for the inner heel part, and the foaming ratio of the bottom surface of the heel part of the reinforcement required part. Is smaller than the expansion ratio of each of the toe part and the bottom part. Therefore, in addition to the effect of the foam slush molded shoe according to claim 1 or 2, the heel part that requires the most wear resistance among the reinforcement-required parts. The bottom strength of the can be maximized.

In the foamed slush molded shoe according to the fourth aspect of the present invention, since the skin skin layer is formed on all or a part of the outer surface of the shoe body, the scratch resistance of the surface of the shoe body can be maintained. .

In the foamed slush molded shoe according to the present invention as defined in claim 5, since the sole is formed on all or part of the outer surface of the bottom surface of the shoe main body, the strength and abrasion resistance of the sole are improved. can do.

According to a sixth aspect of the present invention, there is provided a foam slush molded shoe, wherein the outer skin layer according to the fourth aspect and the fifth aspect are included.
Since both of the shoe soles described above are provided, the scratch resistance of the surface of the shoe main body can be maintained and the strength of the shoe soles and the like can be improved.

In the foamed slush molded shoe according to the seventh aspect of the present invention, since the plastisol constituting the shoe main body contains the foaming agent, cost increase can be suppressed and foaming can be stabilized.

In the method for producing a foamed slush molded shoe according to the present invention of claim 8, the semi-gelled product is heated to a temperature not lower than the gelation temperature and lower than the thermal expansion temperature to promote gelation and then heated to the temperature not lower than the thermal expansion temperature. As a result, the foamed slush molded shoe having sufficient gelation and appropriate foaming can be manufactured.

In the method for manufacturing a foamed slush molded shoe according to the present invention of claim 9, the semi-gelled product is heated to a temperature not lower than the gelation temperature and lower than the thermal expansion temperature to promote gelation and to heat each part of the shoe body. Since foaming is performed by changing the conditions, it is possible to suppress the foaming of the reinforcement-required portion whose strength is required and whose expansion ratio is desired to be suppressed.

In the method for manufacturing a foam slush molded shoe according to the tenth aspect of the present invention, since the heel paste is injected into the inner surface heel part of the semi-gelated product before the heat gelation, it is possible to prevent the heat gelation from occurring. A foamed slush molded shoe can be manufactured in which the temperature rise of the heel portion of the shoe body can be suppressed and the foaming ratio of the bottom surface of the heel portion is suppressed.

In the method for producing a foamed slush molded shoe according to the present invention as set forth in claim 11, since the plastisol to be the epidermis skin layer is injected before the plastisol to be the shoe body is poured into the slush molded shoe mold, An outer skin layer can be formed on the outer surface of the shoe body, and the function of the foamed slush molded shoe can be improved.

[0309] In the method for producing a foamed slush molded shoe according to the present invention of claim 12, the plastisol that will become the sole of the shoe is injected before the plastisol that becomes the shoe body is poured into the mold for the slush molded shoe. A shoe sole can be formed on the outer bottom of the main body, and the function of the foam slush molded shoe can be improved.

In the method for producing a foamed slush molded shoe according to the thirteenth aspect of the present invention, the plastisol constituting the shoe sole is injected and then the plastisol forming the epidermal skin layer is injected, or vice versa. In order to inject plastisol, which will become the shoe body, after injecting plastisol, the outer skin of the shoe body was covered with the epidermis skin layer, and the sole was formed between the shoe body and the epidermis skin layer. Foam slush molded shoes can be manufactured.

In the method for producing a foamed slush molded shoe according to the 14th aspect of the present invention, since the plastisol constituting the shoe main body contains a foaming agent, cost increase can be suppressed and foaming can be stabilized to form a foamed slush molded shoe. Can manufacture shoes.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention.

FIG. 2 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention.

FIG. 3 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention.

FIG. 4 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention.

FIG. 5 is a vertical cross-sectional view showing the structure of an embodiment of a foam slush molded shoe according to the present invention.

FIG. 6 is a process drawing of an example of a method for manufacturing a foam slush molded shoe according to the present invention.

FIG. 7 is an explanatory view of a conventional method for manufacturing a slush molded shoe.

FIG. 8 is an explanatory view of a conventional method for manufacturing a slush molded shoe.

FIG. 9 is an explanatory diagram of a conventional method for manufacturing a slush molded shoe.

[Explanation of symbols]

1,1 ', 1 "', 1 '"', 1 '"'" Foam slush molding shoes 2 Shoe body 3 Bottom part 4 Opening part 5 Toe part 6 Heel part 7 Reinforcement required part 8 Other parts 9 Heel core 10 Skin Skin layer 11 Rear vertical wall surface 12 Sole

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Claims (14)

[Claims] 1. A foamed slush molded shoe having a shoe body composed of a heat-gelated substance of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules, wherein the shoe body is made of the thermally expandable microcapsules. It is foamed by thermal expansion, and the wall thickness of the toe part, the heel part, the bottom part, etc. of the shoe main body that requires reinforcement is greater than the wall thickness of other parts of the shoe main body excluding the reinforcement necessary part. Foam slush molded shoes, which are also characterized by being increased. 2. The foam slush molded shoe according to claim 1, wherein the foaming ratio of all or a part of the reinforcement-requiring part is smaller than the foaming ratio of the other part. 3. The shoe body includes a heel core made of a heat-gelated paste of a heel paste injected in a slush molding process on an inner heel portion, and a foaming ratio of a bottom surface of the heel portion of the necessary reinforcement portion is The foamed slush molded shoe according to claim 1 or 2, wherein the foaming ratio is smaller than the expansion ratio of each of the toe part and the bottom part. 4. The whole or a part of the outer surface of the shoe body,
The foam slush molded shoe according to any one of claims 1 to 3, wherein a skin skin layer made of a heat-gelled thin film of plastisol containing a non-foamed or low-foamed polyvinyl chloride paste resin is formed. 5. A shoe sole made of a heat-gelated plastisol containing a non-foamed or low-foamed polyvinyl chloride paste resin is formed on all or part of the outer surface of the bottom surface of the shoe body, and the reinforcement is required. The foam slush molded shoe according to any one of claims 1 to 3, wherein the toe portion and the heel portion of the portion are made thicker than the bottom portion. 6. A plastisol containing a non-foamed or low-foamed polyvinyl chloride paste resin on all or part of the outer surface of the bottom surface of the skin skin layer or the bottom surface between the shoe body and the skin skin layer. 5. The foam according to claim 4, wherein a shoe sole made of a heat-gelled product is formed, and the wall thickness of the toe part and the heel part of the reinforcement-requiring part is made larger than the wall thickness of the bottom part. Slush molded shoes. 7. The foam slush molded shoe according to claim 1, wherein the plastisol forming the shoe body contains a foaming agent. 8. A shoe body is made of a heat-gelated substance of plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules, and the shoe body is foamed by thermal expansion, and the shoe body needs to be reinforced. When manufacturing a foam slush molded shoe in which the wall thickness of the portion is increased more than the wall thickness of the other portion of the shoe body, a polyvinyl chloride paste resin and a thermal expansive property exhibiting an expanded state at least above the gelation temperature. Plastisol containing microcapsules is injected into a slush-molded shoe mold to a height required for the shoe body of the slush-molded shoe, and the portion of the shoe body that requires reinforcement such as the toe, heel and bottom, and By heating the other parts except the part requiring reinforcement with different heating conditions for semi-gelation, the thickness of the part requiring reinforcement is A semi-gelled product in the form of a shoe body having a thickness larger than the other portions is formed on the inner wall surface of the slush molding shoe mold, and the ungelled plastisol remaining on the inner surface of the semi-gelated product is discharged. And the semi-gelled product formed in the first process is heated to a temperature range not lower than the gelation temperature and lower than the foaming temperature due to the thermal expansion required by the microcapsules to progress the gelation. Then, the second step of heating the microcapsules to a temperature range equal to or higher than the required foaming temperature by thermal expansion to foam the microcapsules by thermal expansion to foam the heat-gelated substance of plastisol constituting the shoe body. A method for producing a foam slush molded shoe, which is characterized in that 9. In the second step, the semi-gelled product formed in the first step is heated to a temperature range not lower than the gelling temperature and lower than the temperature at which the microcapsules are appropriately expanded to gel. After that, by heating the reinforcement-required portion to a temperature below the temperature at which the microcapsules are appropriately expanded or at least the above temperature for a short time and heating the other portion to a temperature range of the temperature or more to foam, Composed of a heat-gelled plastisol containing polyvinyl chloride paste resin and heat-expandable microcapsules, and the foaming ratio of all or a part of the reinforcement-requiring part is smaller than that of the other part. 9. The shoe body according to claim 8, wherein the thickness of the reinforcement-required portion is increased as compared with the thickness of the other portion. Manufacturing method of foamed slush molded shoes. 10. In the second step, the semi-gelled product formed in the first step is heated to a temperature range not lower than the gelling temperature and lower than the temperature at which the microcapsules are appropriately expanded to gelate. Before proceeding with, by injecting a heel paste into the inner heel of the semi-gelated product,
In the shoe body formed in the second step, a heel core made of a heat-gelled product of the heel paste is provided on the inner surface of the heel portion, and the foaming ratio of the bottom surface of the heel portion of the reinforcement-needed portion has a toe portion. 10. The expansion ratio of each of the bottom and the bottom is smaller than the expansion ratio of the bottom and the bottom.
A method for producing the foamed slush molded shoe described. 11. Prior to the first step, a plastisol containing a polyvinyl chloride paste resin is placed inside a mold for slush molding shoes to a height required for a shoe body of the slush molding shoes, or a height including the reinforcement necessary portion. By injecting and heating up to this temperature, a semi-gelled product in the form of a shoe-like thin film is layered on the inner wall surface of the slush molding shoe mold or on the lower part of the inner wall surface, and the ungelled remaining on the inner surface of the semi-gelated product By discharging the plastisol in the state,
A skin skin layer made of a heat-gelled thin film of plastisol containing a non-foamed or low-foamed polyvinyl chloride paste resin is formed on all or part of the outer surface of the shoe body formed in the second step. The method for producing a foamed slush molded shoe according to any one of claims 8 to 10, characterized in that. 12. Prior to the first step, a plastisol containing a polyvinyl chloride paste resin is poured into all or part of the inner bottom of a slush molding shoe mold and heated to fill all or part of the shoe. By forming a bottom semi-gelled material as a layer, the non-foamed or low-foamed polyvinyl chloride paste resin is included in all or part of the outer surface of the bottom surface of the shoe body formed in the second step. 9. A shoe sole made of a heat-gelated plastisol is formed, and the wall thickness of the toe part and the heel part of the reinforcement-requiring part is made larger than the wall thickness of the bottom part. A method for manufacturing a foam slush molded shoe according to claim 10. 13. Before the first step, before injecting plastisol for forming the epidermis skin layer, or for forming a semi-gelled product to be the epidermis skin layer and discharging plastisol in an ungelled state. After that, plastisol containing a polyvinyl chloride paste resin is poured into all or part of the inner bottom portion of the slush molding shoe mold or the semi-gelated product and heated, and the shoe sole-like semi-gelated product is added to the whole or part thereof. By forming a coating layer, non-foaming or low foaming can be achieved on all or part of the outer surface of the bottom surface of the epidermis skin layer, or on all or part of the bottom surface between the shoe body and the epidermis skin layer. A shoe sole made of a heated gel of plastisol containing polyvinyl chloride paste resin is formed, and the thickness of the toe part and the heel part of the necessary reinforcement portion is the thickness of the bottom part. The method for producing a foamed slush molded shoe according to claim 11, wherein the number of the foamed slush molded shoes is increased. 14. The method of manufacturing a foam slush molded shoe according to claim 8, wherein the plastisol forming the shoe body contains a foaming agent.