TW201400542A - Polyolefin foamed composition and polyolefin foamed outsole - Google Patents

Abstract

One polyolefin foamed composition can be used to manufacture light weight polyolefin foamed outsoles. The polyolefin foamed outsoles made according to the polyolefin foamed composition have benefits of small cell sizes, a controlled cell size distribution and low density. Therefore, the polyolefin foamed outsoles have both low density and good mechanical properties.

Description

Polyolefin foam composition and shoe outsole made from the polyolefin composition

The present invention relates to a polyolefin foam composition, and more particularly to a polyolefin foam composition for making a lightweight shoe outsole.

The shoes have the function of protecting the feet. In order to make the user feel comfortable and reduce the burden, lightweighting has become an important demand for shoes. Many shoe parts use foam as a shoe material to achieve weight reduction.

The foam used for the sole of the shoe should have excellent properties such as elasticity, hardness, abrasion resistance, slip resistance and low density. The excellent elasticity can effectively absorb the vibration from the ground during walking and slow down the impact on the foot. The hardness can protect the sole from being damaged by hard or sharp objects on the ground. The wear resistance makes it difficult to wear and can extend the use of shoes. Lifetime and slip-resistance provide the frictional force required for the user to walk, and protect the user from slipping in a smooth or humid place. The low density can reduce the weight of the shoe and reduce the burden on the user.

It is known that the density and mechanical properties of the foam are related to the type of the main plastic substrate, and to the size of the pores of the foam, the number of pores, and the uniformity of the pore size. When the pores of the foam are large, a foam having a lower density can be obtained, but the mechanical properties of the foam are lowered, such as low hardness, easy collapse, elastic deterioration, tensile strength and tear resistance. The strength is low and so on. If the pores of the foam are small, the mechanical properties of the foam can be improved, but the proportion of the foam is large because the plastic substrate is too dense. Whether the size of the foamed pores is uniform, affecting the consistency of mechanical properties And reproducibility. If the pore size is not uniform, it is easy to influence the test results because the pore size of the foam used in each mechanical property test is inconsistent. For the user, the outsole made of the foam with uneven pore size may cause unevenness due to the different deformation variables of the outsole of the shoe, and it is easy to cause damage to the foot.

A foam composition for making a sole of a shoe, the composition of which generally comprises a plastic substrate such as rubber or ethylene/vinyl acetate copolymer (EVA), a bridging agent, a foaming agent, and various additives such as a filling. Agent, one coloring material, one slip agent, and the like. The type of plastic substrate directly affects the properties of the resulting foam. The bridging agent acts to crosslink the different chains of the chain polymer of the plastic substrate, and becomes a network structure, which can increase the strength and elasticity of the plastic substrate, and improve the mechanical properties of the resulting foam. It also plays an important role in the foaming process. By increasing the strength and elasticity of the foamed plastic substrate, the pore structure of the foamed plastic substrate can capture the gas generated by the foaming agent, making the gas difficult to escape. The pore structure is maintained without the reaction of defoaming due to collapse. The foaming agent acts to produce a foaming reaction at a specific temperature. Usually, the foaming agent is thermally decomposed to generate a gas, which causes the plastic substrate to have a pore structure and cause the volume of the plastic substrate to expand. Other additives can be used to improve the appearance and properties of the foam. For example, the filler acts to reduce the cost and increase the hardness and prevent shrinkage. The colorant can impart color to the foam, and the lubricant can make the plastic substrate less susceptible. The adhesive production equipment, on the other hand, can make the surface of the foam smooth and beautiful. The amount and type of each component may be mutually inhibited to affect the physical properties of the foam. For example, when the amount of the foaming agent is increased, the pores of the foam become large, and the size is uneven due to rapid expansion. Stomata, but through the addition of bridging agents, or the increase in fillers, The hardness of the plastic substrate can be increased to limit the speed of the pore expansion, thereby limiting the size of the pores. Therefore, on the practical level, it is difficult for us to separate one of the components separately and explore its effect on the foam. Even if the components of the foam composition are the same, as long as there is a difference in the amount of the package, This will result in different physical properties of the final foam.

Through our painstaking research and many experiments, we finally get a formula of polyolefin foam composition that can take into consideration the density and mechanical properties. We will not disclose the experimental results of our painstaking research to the world. The manufacturer creates a shoe outsole with superior physical properties.

An object of the present invention is to provide a polyolefin foam composition, and the foam obtained by using the polyolefin foam composition can achieve both density and mechanical properties, and is therefore very suitable for use in making a shoe outsole. The sole of the shoe made of the conventional polyolefin foam composition has a specific gravity of 0.8 gram per cubic centimeter to 1 gram per cubic centimeter. The sole of the shoe made of the polyolefin foam composition of the invention has a specific gravity of 0.45 g per cubic centimeter to 0.75 g per cubic centimeter, which is obviously smaller than the proportion of the outsole of the conventional shoe, and can maintain the outsole of the shoe. General physical requirements, effectively achieve the purpose of both lightweight and qualified mechanical properties.

One aspect of the present invention provides a polyolefin foam composition comprising a vinyl/vinyl acetate copolymer (EVA) and a polyolefin elastomer (Polyolefin Elastomers, abbreviated as POE), EVA and POE. The weight ratio relationship ranges from: EVA to POE is 50 to 50 to EVA than POE is 80 to 20, and the weight of the plastic substrate EVA and POE is combined. 100 parts by weight, further comprising 5 to 23 parts by weight of rubber, 0.8 to 2.3 parts by weight of a bridging agent, 2 to 12 parts by weight of a nanofiller, 1.1 to 2.3 parts by weight of a foaming agent, 0.5 To 1.2 parts by weight of the nanofoaming aid and 2 to 3 parts by weight of the compatibilizer.

Conventional shoes outsole composition plastic substrate is EVA and rubber. EVA is characterized by its good flexibility, transparency, surface gloss, excellent chemical resistance and coloring properties, but its hardness and wear resistance are relatively poor, such as Only EVA is used as the plastic substrate component of the outsole of the shoe, and the outsole has the shortcoming of short service life. The advantage of rubber is that it can have good hardness and wear resistance after being cross-linked or vulcanized, but it lacks softness, easily makes the wearer feel uncomfortable, and the cost of rubber is high. Therefore, in the composition of the present invention, in addition to EVA, POE is used as a plastic substrate component, and POE has a rubber-like effect, which can improve the elasticity and wear resistance of the EVA foam, but the price is much lower than that of rubber. The utility model has the advantages of small specific gravity and is advantageous for the lightweighting of the foam body. Therefore, the composition is made of EVA and POE as a plastic substrate, and a little rubber is added as a plastic substrate modifier to strengthen the plastic substrate. Mechanical properties.

A polyolefin foam composition according to an embodiment of the present invention, wherein the vinyl acetate (VA) contained in the EVA accounts for 21 to 40% by weight of the EVA, and the POE uses a grade A having a hardness of less than 60 degrees. material. The role of the bridging agent is to cause cross-linking between different chains of the chain polymer of the plastic substrate to form a network structure, which can strengthen the elasticity and hardness of the plastic substrate, and maintain the structure of the pores, and should be selected when the bridging agent is selected. Consider the following factors: (1) high crosslinking efficiency and good dispersibility, (2) suitable decomposition temperature and speed, stable temperature at low temperature mixing, no premature crosslinking or production A large amount of volatiles are produced, (3) the decomposition product of the bridging agent is non-toxic and tasteless, and (4) the bridging agent does not chemically react with other components. A polyolefin foam composition according to an embodiment of the present invention, wherein the bridging agent may be dicumyl peroxide. The purpose of the nano filler is to reduce the cost and increase the hardness. According to an embodiment of the present invention, the polyolefin foam composition can be an inorganic white smoke having an average particle diameter of 50 nm to 200 nm. Powder, the present invention can be more uniformly dispersed in a foam made of the composition by using a nano filler because it has a small particle size and can be sufficiently mixed with other components. The foam exhibits consistent, average hardness.

The foaming agent generates a foaming reaction at a suitable temperature, decomposes to generate a gas, and causes the plastic substrate to expand due to the generation of pores, and the foaming aid is used to reduce the temperature at which the foaming agent generates a foaming reaction, thereby making it The polyolefin foam composition can be reacted according to an embodiment of the present invention, wherein the foaming agent can be azodimethylamine, and the nano foaming aid can be an average. Nano zinc oxide having a particle diameter of 160 nm to 220 nm. The use of zinc oxide as a foaming aid can reduce the temperature at which azomethicin can cause a foaming reaction from about 190 ° C to 220 ° C to about 150 ° C to 180 ° C. The particle size of the foaming aid has a decisive influence on the foaming reaction. If a foaming aid of the same quality but different particle diameter is added, the larger the particle size, the slower the reaction rate, the less easily the pore formation is synchronized, that is, Some of the pores are being formed and some of the pores are collapsed by defoaming, resulting in different pore sizes. By using nano zinc oxide as a foaming aid, the zinc oxide particle size used is much smaller than the conventional particle diameter, on the one hand, the surface area is increased, the reaction rate is accelerated, and the plastic substrate can be synchronized quickly. Foaming, and maintaining and controlling the size of the pores by an appropriate proportion of bridging agent, so that the foam produced by the present invention, The pores are smaller, the number is larger, and the pore size is more uniform. On the other hand, since the foaming aid particles become smaller, it is easier to uniformly disperse in the plastic substrate to make the foaming reaction more uniform.

The compatibilizer can be a maleic anhydride (MA) grafted polymer which is used to reinforce the bond between various inorganic fillers and plastic substrates to maintain high strength abrasion resistance and mechanical properties.

The polyolefin foam composition according to an embodiment of the present invention further comprises at least one additive, which may be a filler, an anti-wear agent or a combination thereof. As the filler, an inorganic mineral powder having an average particle diameter of 5 um to 8 um such as calcium carbonate, clay or white smoke can be used, and a silane compound can be used as the anti-wear agent.

Another aspect of the present invention is to provide a shoe outsole which is obtained by foam molding of the above polyolefin foam composition. The method of foam molding can adopt a more traditional method, for example, all the components are kneaded by using a machine to form a sheet, and the sheet is placed in a flat plate mold, and crosslinked and foamed at a certain temperature and pressure to form a sheet. A thick piece, and then the thick piece is cut as needed. Newer technologies such as injection foam molding can also be used. All components are firstly mixed at a low temperature to form rubber pellets, and the rubber pellets are melted and shot to form a foam molding. The above methods are well known in the industry and will not be described in detail herein.

The sole of the shoe according to an embodiment of the present invention has a specific gravity of 0.45 gram per cubic centimeter to 0.75 gram per cubic centimeter.

The polyolefin foam composition of the present invention is subjected to repeated experimental results to obtain a preferable ratio between the components, and then through the use of a nanofiller and a nanofoaming auxiliary agent, in addition to the polyolefin. The sole of the shoe made of the foam composition has an average hardness which is increased on average and has a small size. Uniform and large number of pores. Because the pores are smaller and more, the plastic substrate between the pores and the pores has the function of supporting and protecting the pores, so that the outsole of the shoe is not easily deformed by the extrusion of external force, so the shoe is large through the dense pore structure. The bottom has good hardness and elasticity. If the number of pores is large, the proportion of the sole of the shoe is small, and the uniform pore size makes the entire foam exhibit uniform physical properties.

Comparative example 1:

Please refer to the first figure, which is a shoe outsole molded by a conventional polyolefin foam composition, which is magnified by an optical microscope at a magnification of 50, and then enlarged by a charge coupled device (CCD). photo. The lighter part is the pores, and the darker part between the pores and the pores is the plastic substrate. The inner diameters of the pores of the pores 0, the pores 1, the pores 2, the pores 3, the pores 4, the pores 5, and the pores 6 were measured, and the arrows represent the directions of the measured inner diameters of the pores, and the results are shown in Table 1.

The polyolefin foam composition used in the outsole of the shoe is formulated as follows: the plastic substrate is ethylene/vinyl acetate copolymer (EVA) and rubber, and the weight ratio of EVA to rubber is: EVA ratio The rubber is 10 to 90 to EVA, and the rubber is 30 to 70. The weight of the plastic substrate component EVA and the rubber is 100 parts by weight, and the other 2 to 3 parts by weight of the bridging agent and 2 to 3 parts by weight of the foam are included. The agent, 15 to 30 parts by weight of the filler, 2 to 3 parts by weight of the compatibilizer, 2 to 3 parts by weight of the anti-wear agent, and 0.5 to 1.5 parts by weight of the slip agent.

Among them, vinyl acetate (VA) contained in EVA accounts for the weight of EVA The percentage is 21 to 40%, the bridging agent is dicumyl oxide, the blowing agent is azomethicamine, and the filler is an inorganic mineral powder having an average particle diameter of 5 um to 8 um such as calcium carbonate, clay or white smoke. The compatibilizer uses maleic anhydride (MA) grafted polymer, which is used to reinforce the connection between various inorganic fillers and plastic substrates, and can maintain high-strength wear resistance and mechanical properties. Stearic acid can be used as a slip agent. As the antiwear agent, a silane compound can be used.

All the ingredients of the above formula were batched into a banbury mixer, all the ingredients were uniformly mixed, and the kneaded mixture was sliced using a tworoll mill, and the sheet was placed in a flat plate mold. The cross-linking foaming is carried out at a temperature of 150 ° C to 180 ° C and a pressure of 150 kg / cm ² , and the foaming time is adjusted according to the thickness of the above-mentioned sheet, and the thickness of the mold is multiplied by 1.6 times, that is, required The foaming time, the unit of the thickness of the mold is mm (mm), and the unit of time is minute (min). After the above-mentioned sheet is foamed, it is cut to form an outsole.

The outsole of the foamed foam composition of the polyolefin foam composition may have a specific gravity of 0.85 g per cubic centimeter.

Please refer to Table 1, which is the number of the air holes in the first figure and the inner diameter of the air holes corresponding to the number. It can be seen from Table 1 that the average inner diameter of the pores is 97.74 um.

First embodiment:

Please refer to FIG. 2, which is a foam-formed outsole of a polyolefin foam composition according to a first embodiment of the present invention, which is observed by an optical microscope at a magnification of 50 times, and then the cross section is a charge coupled device ( CCD) Take a magnified photo taken. The lighter part is the pores, and the darker part between the pores and the pores is the plastic substrate. The inner diameters of the pores of the pores 0, the pores 1, the pores 2, the pores 3, the pores 4, the pores 5, and the pores 6 were measured, and the arrows represent the directions of the measured inner diameters of the pores, and the results are shown in Table 2.

The polyolefin foam composition used in the outsole of the shoe is formulated as follows: the plastic substrate component is ethylene/vinyl acetate copolymer (EVA) and polyolefin elastomer (POE), and the weight ratio range of EVA and POE For: EVA The ratio of the POE is 50 to 50 to EVA, and the POE is 80 to 20. The total weight of the plastic substrate component EVA and POE is regarded as 100 parts by weight, and further includes 13 to 23 parts by weight of rubber and 0.8 to 1.4 parts by weight of the bridging agent. 2 to 6 parts by weight of the nanofiller, 1.1 to 1.6 parts by weight of the foaming agent, 0.5 to 0.8 part by weight of the nanofoaming auxiliary, 28 parts by weight of the filler, 2 to 3 parts by weight of the compatible A 2.8 parts by weight of an anti-wear agent, and 1.1 parts by weight of a slip agent.

Among them, vinyl acetate (VA) contained in EVA accounts for 21 to 40% by weight of EVA, POA uses A grade pellets with hardness less than 60 degrees, bridging agent uses dicumyl oxide, and nanofiller An inorganic white smoke powder having an average particle diameter of 50 nm to 200 nm is used, the blowing agent is azodimethylamine, and the nano foaming aid is an average particle diameter of 160 nm to 220 nm. Rice zinc oxide, fillers use inorganic mineral powders with an average particle size of 5um to 8um such as calcium carbonate, clay or white smoke. Compatibilizers use maleic anhydride (MA) grafted polymers to reinforce various inorganic fillers. The connection between the agent and the plastic substrate can maintain high-strength abrasion resistance and mechanical properties. Stearic acid can be used as the slip agent, and silane can be used as the anti-abrasion agent.

All the ingredients of the above formula were batched into a banbury mixer, all the ingredients were uniformly mixed, and the kneaded mixture was sliced using a tworoll mill, and the sheet was placed in a flat plate mold. The cross-linking foaming is carried out at a temperature of 150 ° C to 180 ° C and a pressure of 150 kg / cm ² , and the foaming time is adjusted according to the thickness of the above-mentioned sheet, and the thickness of the mold is multiplied by 1.6 times, that is, required The foaming time, the unit of the thickness of the mold is mm (mm), and the unit of time is minute (min). After the above-mentioned sheet is foamed, it is cut to form an outsole.

The outsole of the foamed foam composition of the polyolefin foam composition may have a specific gravity of 0.75 gram per cubic centimeter, which is less than 0.8 gram per cubic centimeter of the outer sole of the conventional shoe to 1 gram per cubic centimeter.

Please refer to Table 2, which is the number of the air holes in the second figure and the inner diameter of the air holes corresponding to the number. It can be seen from Table 2 that the average inner diameter of the pores is 52.87 um, which is smaller than the average inner diameter of the pores of the conventional shoe of Comparative Example 1 of 97.74 um.

Second embodiment:

Please refer to FIG. 3 , which is a foamed molded outsole of a polyolefin foam composition according to a second embodiment of the present invention, which is observed by an optical microscope at a magnification of 50 times, and then the cross section is a charge coupled device ( CCD) Take a magnified photo taken. The lighter part is the pores, and the darker part between the pores and the pores is the plastic substrate. Measure the vent 0, respectively The inner diameters of the pores of the pores 1, the pores 2, the pores 3, the pores 4, the pores 5, and the pores 6 indicate the direction of the inner diameter of the pores measured, and the results are shown in Table 3.

The polyolefin foam composition used in the outsole of the shoe is formulated as follows: the plastic substrate component is ethylene/vinyl acetate copolymer (EVA) and polyolefin elastomer (POE), and the weight ratio range of EVA and POE The ratio of EVA to POE is 50 to 50 to EVA is 80 to 20, and the weight of the plastic substrate component EVA and POE is 100 parts by weight, and 8 to 14 parts by weight of rubber and 1.3 to 1.8 parts by weight. The bridging agent, 5 to 9 parts by weight of the nanofiller, 1.5 to 1.9 parts by weight of the foaming agent, 0.7 to 1.0 part by weight of the nanofoaming aid, 22 parts by weight of the filler, 2 to 3 parts by weight The compatibilizer, 2.2 parts by weight of the anti-wear agent, and 1.1 parts by weight of the slip agent.

Among them, vinyl acetate (VA) contained in EVA accounts for 21 to 40% by weight of EVA, POA uses A grade pellets with hardness less than 60 degrees, bridging agent uses dicumyl oxide, and nanofiller An inorganic white smoke powder having an average particle diameter of 50 nm to 200 nm is used, the blowing agent is azodimethylamine, and the nano foaming aid is an average particle diameter of 160 nm to 220 nm. Rice zinc oxide, fillers use inorganic mineral powders with an average particle size of 5um to 8um such as calcium carbonate, clay or white smoke. Compatibilizers use maleic anhydride (MA) grafted polymers to reinforce various inorganic fillers. The connection between the agent and the plastic substrate can maintain high-strength abrasion resistance and mechanical properties. Stearic acid can be used as the slip agent, and silane can be used as the anti-abrasion agent.

All the ingredients of the above formula were batched into a banbury mixer, all the ingredients were uniformly mixed, and the kneaded mixture was sliced using a tworoll mill, and the sheet was placed in a flat plate mold. The cross-linking foaming is carried out at a temperature of 150 ° C to 180 ° C and a pressure of 150 kg / cm ² , and the foaming time is adjusted according to the thickness of the above-mentioned sheet, and the thickness of the mold is multiplied by 1.6 times, that is, required The foaming time, the unit of the thickness of the mold is mm (mm), and the unit of time is minute (min). After the above-mentioned sheet is foamed, it is cut to form an outsole.

The outsole of the foamed foam composition of the polyolefin foam composition may have a specific gravity of 0.62 gram per cubic centimeter, which is less than 0.8 gram per cubic centimeter of the base of the conventional shoe to 1.0 gram per cubic centimeter.

Please refer to Table 3, which is the number of the air holes in the third figure and the inner diameter of the air holes corresponding to the number. It can be seen from Table 3 that the average inner diameter of the pores is 42.33 um, which is at least 50% lower than the average inner diameter of the pores of the conventional shoe of Comparative Example 1 of 97.74 um.

Third embodiment:

Please refer to FIG. 4 , which is a foamed and formed outsole of a polyolefin foam composition according to a third embodiment of the present invention, which is observed by an optical microscope at a magnification of 50 times, and then the cross section is a charge coupled device ( CCD) Take a magnified photo taken. The lighter part is the pores, and the darker part between the pores and the pores is the plastic substrate. The inner diameters of the pores of the pores 0, the pores 1, the pores 2, the pores 3, the pores 4, the pores 5, and the pores 6 were measured, and the arrows represent the directions of the measured inner diameters of the pores, and the results are shown in Table 4.

The polyolefin foam composition used in the outsole of the shoe is formulated as follows: the plastic substrate component is ethylene/vinyl acetate copolymer (EVA) and polyolefin elastomer (POE), and the weight ratio range of EVA and POE The ratio of EVA to POE is 50 to 50 to EVA is 80 to 20, and the weight of the plastic substrate component EVA and POE is 100 parts by weight, and 5 to 9 parts by weight of rubber and 1.6 to 2.3 parts by weight. The bridging agent, 8 to 12 parts by weight of the nanofiller, 1.7 to 2.3 parts by weight of the foaming agent, 0.8 to 1.2 parts by weight of the nanofoaming aid, 17 parts by weight of the filler, 2 to 3 parts by weight The compatibilizer, 1.7 parts by weight of the anti-wear agent, and 1.1 parts by weight of the slip agent.

Among them, vinyl acetate (VA) contained in EVA accounts for 21 to 40% by weight of EVA, POA uses A grade pellets with hardness less than 60 degrees, bridging agent uses dicumyl oxide, and nanofiller An inorganic white smoke powder having an average particle diameter of 50 nm to 200 nm is used, the blowing agent is azodimethylamine, and the nano foaming aid is an average particle diameter of 160 nm to 220 nm. Rice zinc oxide, fillers using inorganic mineral powders with an average particle size of 5um to 8um such as calcium carbonate, clay or white smoke, compatibilizers using horses An acid anhydride (MA) grafted polymer used to reinforce the bond between various inorganic fillers and the main plastic substrate to maintain high strength wear resistance and mechanical properties. Stearic acid can be used as a slip agent. A silane compound can be used.

All the ingredients of the above formula were batched into a banbury mixer, all the ingredients were uniformly mixed, and the kneaded mixture was sliced using a tworoll mill, and the sheet was placed in a flat plate mold. The cross-linking foaming is carried out at a temperature of 150 ° C to 180 ° C and a pressure of 150 kg / cm ² , and the foaming time is adjusted according to the thickness of the above-mentioned sheet, and the thickness of the mold is multiplied by 1.6 times, that is, required The foaming time, the unit of the thickness of the mold is mm (mm), and the unit of time is minute (min). After the above-mentioned sheet is foamed, it is cut to form an outsole.

The outsole of the foamed foam composition of the polyolefin foam composition may have a specific gravity of 0.48 gram per cubic centimeter, which is less than 0.8 gram per cubic centimeter of the base of the conventional shoe to 1 gram per cubic centimeter.

Please refer to Table 4, which is the number of the air holes in the figure 4 and the inner diameter of the air holes corresponding to the number. It can be seen from Table 4 that the average inner diameter of the pores is 28.78 um, which is at least 70% lower than the average inner diameter of the pores of the conventional shoe of Comparative Example 1 of 97.74 um.

Referring to Table 5, the test results obtained by testing the specific gravity and various mechanical properties of the foamed outsole of the polyolefin foam composition of the first to third embodiments of the present invention. The first column is the type of physical property, and the second column is the test method. Among them, ASTM (American Standard of Testing Materials) refers to the American Society for Measurement Standards, and ASTM D2240 is taken as an example to indicate the test method using American Society for Measurement Standards No. D2240. One test method has a standard procedure, and the third column is the test result, where A is the test result of the first embodiment, B is the test result of the second embodiment, C is the test result of the third embodiment; It is the physical demand for the soles of the shoes, that is, the research and development goals.

From the above, comparing the first to fourth figures, and comparing the data of Tables 1 to 4, it can be seen that according to the insole of the foamed molding of the present invention, the inner diameter of the air hole of the sole of the shoe is significantly smaller than that of the outsole of the shoe. The inner diameter of the pores is small, and the inner diameter size distribution of the pores of the present invention is average. From the test results of Table 5, it is shown that the density of the outsole of the foamed molding of the present invention is 0.75 g per cubic centimeter, 0.62 g per cubic centimeter, and 0.48 g per cubic centimeter, which can satisfy the operator's outsole. The density requirement of 0.6 ± 0.15 gram per cubic centimeter, and other mechanical properties can also meet the expectations and needs of the industry. Therefore, when the polyolefin foam composition is applied to the production of a shoe sole, an excellent shoe outsole having a balance of various physical properties such as density, hardness, and abrasion resistance can be obtained.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

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The above and other objects, features, advantages and embodiments of the present invention will become more apparent and understood.

Fig. 1 is an enlarged view of a shoe outsole which is foam molded by a conventional polyolefin foam composition, which is observed by an optical microscope at a magnification of 50 times, and the cross section is taken by a charge coupled device (CCD).

Figure 2 is a polyolefin foam composition according to a first embodiment of the present invention. The foam-formed outsole was magnified by an optical microscope at a magnification of 50, and the cross-section was photographed by a charge coupled device (CCD).

Fig. 3 is a perspective view of a foamed molded outsole of a polyolefin foam composition according to a second embodiment of the present invention, which is observed by an optical microscope at a magnification of 50 times, and then the cross section is photographed by a charge coupled device (CCD). Enlarge the photo.

Fig. 4 is a perspective view of a foamed molded outsole of a polyolefin foam composition according to a third embodiment of the present invention, which is observed by an optical microscope at a magnification of 50 times, and then the cross section is photographed by a charge coupled device (CCD). Enlarge the photo.

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Claims (10)

A polyolefin foam composition comprising: (A) an ethylene/vinyl acetate copolymer (EVA); (B) a polyolefin elastomer (POE); (C) a rubber; (D) a bridging agent; (E) nanofiller; (F) foaming agent; (G) nanofoaming aid; and (H) compatibilizer; the ratio of each component is as follows, wherein (A) component and (B) component The weight ratio (A)/(B) is 50/50 to 80/20, and the content of the component (C) is 5 to 23 parts by weight based on 100 parts by weight of the component (A) and the component (B), (D) The content of the component is 0.8 to 2.3 parts by weight, the content of the component (E) is 2 to 12 parts by weight, the content of the component (F) is 1.1 to 2.3 parts by weight, and the content of the component (G) is 0.5 to 1.2 parts by weight, H) The content of the component is 2 to 3 parts by weight. The polyolefin foam composition of claim 1, further comprising at least one additive. The polyolefin foam composition of claim 2, wherein the additive is a filler. The polyolefin foam composition of claim 2, wherein the additive is an anti-wear agent. The polyolefin foam composition of claim 1, wherein the nanofiller is an inorganic white smoke powder. The polyolefin foam composition of claim 5, wherein the inorganic white smoke powder has an average particle diameter of from 50 nm to 200 nm. The polyolefin foam composition of claim 1, wherein the nanofoaming aid is one nano zinc oxide. The polyolefin foam composition of claim 7, wherein the nano zinc oxide has an average particle diameter of from 160 nm to 220 nm. A shoe outsole obtained by foam molding of a polyolefin foam composition according to any one of claims 1 to 8. The sole of the shoe of claim 9 has a specific gravity of 0.45 gram per cubic centimeter to 0.75 gram per cubic centimeter.