JPH1158641A - Polypropylene-based resin foamed particle composite molded body and multi-layered sheet for composite molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of a sheet and make it possible to use sanitarily under the condition that its external appearance is kept beautiful and it does not broken over a long period of time by a method wherein a polypropylene-based resin foamed particle molded body and a multi-layered sheet formed by laminating specified resin layers to each other are integrally molded under the condition that one side of the resin layer is faced to the heat fusion welding surface side. SOLUTION: A composite molded body 1 is produced by integrally molding a polypropylene- based resin foamed particle molded body 2 and a multi-layered sheet 3 formed by laminating resin layers A and B in the order named to each other under the condition that the resin layer B side faces to the heat fusion welding surface side of the foamed particle molded body. In addition, the resin layer A is made of polypropylene homopolymer and/or polypropylene block copolymer and includes an organic crystal nucleating agent and/or an inorganic filler. The resin layer B is made of polypropylene-based polymer, the melting point of which lies within the range of ±10 deg.C of the melting point of the foamed particle molded body. Thus, a composite molded body, the external appearance of which is beautiful, the surface of which is too smooth for a stain to adhere to and for the adhered stain to stock to and which is easy to be rinsed even in the state being stained, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a composite molded article of expanded polypropylene resin particles and a multilayer sheet for the composite molded article.

[0002]

2. Description of the Related Art Conventionally, as a packaging material for a fish box or the like, a molded article having a shape corresponding to a mold cavity is formed by filling a large number of resin foam particles into a mold and fusing and integrating the foam particles. In this case, a foamed particle molded body is used.

[0003]

However, the above-mentioned conventional foamed particle molded article is inferior in surface strength and impact resistance, may be damaged by a small number of uses and small impacts, has poor durability, and has a scratched surface. It was easy. In particular, those using a styrene resin were poor in weather resistance and impact resistance. Further, the fusion boundary between the foamed particles is exposed on the surface of the molded body as a groove, and the surface is poor in smoothness, and it cannot be said that the appearance is beautiful. There are drawbacks that various germs easily accumulate and hardly fall, and the appearance deteriorates immediately or becomes unsanitary. Conventionally, items that are used repeatedly over a long period of time, such as pass-through boxes, and those that are used in environments that are difficult to break, are used to clean and remove dirt when they become dirty.
Since the conventional foam molded article is easily stained and hard to fall off, the frequency of cleaning must be increased, and the time required for a single cleaning is great, which is economically disadvantageous.

[0004] Therefore, in consideration of the time and effort of cleaning, there are cases where it is economically advantageous to dispose of the device as a damaged one without performing cleaning. However, when incinerated, the old-type low-temperature incinerator may be damaged, and styrene-based resins cannot be easily incinerated due to the generation of harmful gases. Has occurred. Further, from the viewpoint of effective use of resources, it is preferable to wash and reuse the resources without disposing them, and there is an increasing social demand that at least the materials should be recycled and the raw materials should be reused.

Although cleaning with steam is a relatively labor-saving method, this method is used for conventional foamed particle moldings because the foamed particle molding shrinks due to the heat of steam and cannot maintain its original shape. I couldn't.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and solves the above-mentioned disadvantages of the prior art, has excellent durability, has a beautiful appearance without any special labor, and is hygienic for a long period of time. It is an object of the present invention to provide a molded article using foamed particles that can be used without breakage. Another object of the present invention is to provide a sheet material from which the above-mentioned molded article can be easily obtained.

[0007]

According to the present invention, there is provided (1) a molded article made of expanded polypropylene resin particles and a multilayer sheet in which resin layers (A) and (B) are laminated in order on the resin layer B side. Characterized by being integrally molded as a heat-sealing surface side with the polypropylene resin foamed particle composite molded article. Resin layer A: a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer B: a resin layer composed of a polypropylene-based polymer and having a melting point within the range of the melting point of the molded article of the foamed polypropylene resin particles ± 10 ° C. (2) Expanded polypropylene resin particles and the following C ~
A multi-layered sheet formed by laminating resin layers of E in order and integrally formed with the resin layer E side as a heat-sealing surface side with the expanded particle molded body. . Resin layer C: a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer. Resin layer D: a resin layer made of a polypropylene-based polymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer E: a resin layer composed of a polypropylene-based polymer and having a melting point within the range of the melting point of the molded article of the foamed polypropylene resin particles ± 10 ° C. (3) The composite foamed polypropylene resin particles according to the above (2), wherein the resin layer C contains a colorant and / or an antibacterial agent; and (4) Laminated and integrated with the polypropylene resin foam by heat fusion. A multi-layer sheet for composite molding, wherein resin layers of the following F to H are laminated in order. Resin layer F: made of polypropylene homopolymer and / or polypropylene block copolymer, and contains a coloring agent and / or
Or a resin layer containing an antibacterial agent. Resin layer G: a resin layer composed of a polypropylene-based polymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer H: a resin layer made of a polypropylene-based polymer and having a melting point within the range of the melting point of the polypropylene-based resin foam ± 10 ° C. Is the gist.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a composite molded article of expanded polypropylene resin particles of the present invention (hereinafter simply referred to as a composite molded article).
It is a longitudinal cross-sectional view which shows an example. First, the embodiment shown in FIG. 1 will be described. A composite molded article 1 shown in FIG. 1 is composed of a polypropylene resin foamed particle molded article (hereinafter simply referred to as a foamed particle molded article) 2 and a multilayer sheet 3 in which the following resin layers A and B are sequentially laminated. The side is integrally formed with the side of the heat-fused surface with the foamed particle molded body. Resin layer A: a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer B: a resin layer made of a polypropylene-based polymer and having a melting point within the range of the melting point of the foamed particle molded article ± 10 ° C.

[0009] The expanded particle formed body 2 in the composite formed body 1 is formed by integrally forming foamed particles made of a polypropylene-based polymer by heat fusion. Usually, the melting point of the polypropylene-based polymer is 135 to 165.
C., preferably 135-150.degree. C., polypropylene random copolymer is used. If you use a polypropylene polymer, you can incinerate unnecessary items,
Since it does not emit harmful substances, it is effective for environmental protection.

The resin layer B constituting the multilayer sheet 3 has a melting point within the range of the melting point of the foamed article 2 ± 10 ° C., preferably within the range of the melting point of the foamed article 2 ± 5 ° C. When the melting point is lower than the above range, thermal deformation on the resin layer B side is likely to occur by heating when obtaining a composite molded body integrated with the expanded particle molded body 2 using the multilayer sheet 3, and the multilayer sheet There is a possibility that a composite molded body having a smooth surface (surface of the resin layer A) 3 cannot be obtained. On the other hand, if the melting point is higher than the above range, it becomes difficult to integrate the foamed particle molded body 2 with the portion of the foamed particle molded body 2. It will be what caused the. As the melting point of the resin layer B is closer to the melting point of the foam molded body 2, the adhesiveness between the two by heat fusion is improved.
In addition, the fusion processing time for heat fusion can be shortened. Also,
When the resin layer B is formed as a resin layer made of a polymer of the same kind and the same quality as the polymer used in the expanded particle molded article 2 (for example, when both are made of propylene random copolymer), the resin layer B and the surface of the expanded particle molded article 2 Adhesion can be further improved. Since the resin layer B is made of a polypropylene-based polymer, the material is easy to recycle because it is a resin of the same quality as the foamed particle molded body 2. The thickness of the resin layer B is usually 0.03 to 0.4 mm, but is not limited thereto. The ratio of the thickness of the resin layer B to the total thickness of the multilayer sheet 3 is preferably more than 0% and 20% or less.

Since the resin layer A is made of a polypropylene homopolymer and / or a polypropylene block copolymer, the resin layer A is a resin of the same quality as the foamed particle molded body 2, so that material recycling is easy. In addition, since the rigidity is higher than that of the random copolymer, it is suitable for maintaining the external appearance because it is strong against external damage when positioned on the surface. Further, the resin layer A
Contains an organic crystal nucleating agent and / or an inorganic filler,
There is an advantage that the dimensional stability after molding the composite molded article is excellent and the strength of the molded article is increased. Those containing an organic crystal nucleating agent have the advantage that the crystallization rate is increased and the molding temperature range can be widened, so that the moldability is improved.
The melting point of the resin layer A is preferably from the melting point of the resin layer B +8 to the melting point of the resin layer B + 25 ° C. The thickness of the resin layer A is arbitrary, but is usually 0.15 to 2.0 mm. The ratio of the thickness of the resin layer A to the total thickness of the multilayer sheet 3 is preferably 80% or more and less than 100%.

Examples of the organic crystal nucleating agent include dibenzylidene sorbitol, ditrilidene sorbitol, aluminum dibenzoate, aluminum hydroxy-di (t-butylbenzoate), sodium bis (4-t-butylphenyl) phosphate, and benzoic acid. Acid sodium, aluminum hydroxy-pt-butylbenzoate and the like. When the organic crystal nucleating agent is contained in the resin layer A, the content is usually 0.05 to 1% by weight, preferably 0.1% by weight.
~ 0.5% by weight. Organic crystal nucleating agent content of 0.0
When the content is less than 5% by weight, the effect described above is reduced, and the meaning of the content is lost. Further, even if the content exceeds 1.0% by weight, the above effect is not so much improved.

The above-mentioned inorganic fillers include talc,
Examples include calcium carbonate, kaolin, mica, alumina, magnesium carbonate, magnesium hydroxide, magnesium sulfate and the like. The content of the inorganic filler in the resin layer A is generally 5 to 30% by weight, preferably 7 to 30% by weight.
２５25% by weight. If the content of the inorganic filler is too low, the effect is small and the meaning of the content is lost. If the content of the inorganic filler is too high, the moldability may be affected.

Further, an organic crystal nucleating agent and an inorganic filler can be contained together, and in addition, a coloring agent, an antibacterial agent and the like can be contained within a range in which the effects aimed at by the present invention can be achieved. .

In the present invention, the resin layer A of the multilayer sheet 3 is constituted as a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer containing an organic crystal nucleating agent and / or an inorganic filler.
Adhesiveness to the resin layer B can be maintained, and excellent surface smoothness, surface rigidity, and dimensional stability can be imparted to a composite molded article obtained after molding using the multilayer sheet 3.

The composite molded body 1 described above is, for example,
It can be obtained as follows. Hereinafter, an example of the method for producing a composite molded article of the present invention will be described with reference to FIG. The multilayer sheet 3 is manufactured in advance by continuously extruding each sheet composed of the resin layer A and the resin layer B, and continuously heat-sealing these sheets to form a raw material of the multilayer sheet 3.
This material is usually kept in a roll.
The raw material of the multilayer sheet 3 can be obtained by another method such as inflation by co-extrusion. And
First, as shown in the first figure, a pair of male and female dies 11, 1
2 is formed into a shape according to the surface shape of the composite molded article to be obtained by continuous hot press molding. Next, a shaped part is cut out from the shaped web to obtain a shaped body 6 (second figure) of the multilayer sheet 3 to be subjected to the next integral molding. Then, as shown in the third to fifth drawings, the shaped body 6 of the multilayer sheet 3 is placed on the core-side inner surface of the mold for integral molding, and the foamed particles are placed in the cavity of the mold by insert molding. Fill to obtain a composite molded article. For more information,
First, the shaped body 6 of the multilayer sheet 3 is placed on the inner surface of the core-side mold 21, and the shaped body 6 is sucked from the ventilation hole a provided in the core-side mold 21 and communicating with the cavity, thereby transferring the shaped body 6 to the core-side mold 21. 2
1. Adsorbed and fixed on the inner surface (third figure). Next, usually, the mold 22 on the cavity side is moved to approach the mold 21 on the core side, and the mold is closed. The mold is not completely closed, leaving a gap in which the foamed particles cannot enter and exit, and the foamed particles 7 are filled from the filling feeder 23 for the integral molding as shown by the arrow (fourth diagram).
The foamed particles 7 are foamed particles that constitute a part of the foamed particle molded body 2 of the composite molded body 1 to be obtained by integral molding. After the filling of the foamed particles into the mold is completed, the mold is closed as shown in the fifth diagram, and then the molded article is heated. In the heat molding, first, steam is supplied from the ventilation hole a provided in the core side mold 21 to the shaped body 6 as shown by an arrow, and heating is performed from the shaped body 6 side (first heating), and then the cavity side Steam is supplied to the foamed particles 7 from the ventilation holes b provided in the mold 22 as shown by arrows, and heating is performed from the foamed particles 7 side (second heating). Then, steam is supplied from both sides and the steam is supplied from both sides. Heating is performed (third heating). By this heat molding operation, the foamed particles are thermally fused to each other to form a foamed molded body 2, and the shaped body 6 of the multilayer sheet 3 is thermally fused to the surface of the foamed molded body 2 to be integrally formed. Thus, a composite molded body 1 having a simplified shape is obtained. After cooling for a predetermined time, the mold is opened and the composite molded body 1 as shown in the last figure is taken out.

Next, another embodiment of the composite molded article of the present invention will be described with reference to FIG. As another aspect of the present invention,
The composite molded article 1 is formed by integrally forming the foamed particle molded article 2 and a multilayer sheet 4 in which resin layers C to E described below are laminated in order with the resin layer E side being a heat-sealing surface side with the foamed particle molded article 2. It may be formed by molding. Resin layer C: a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer. Resin layer D: a resin layer made of a polypropylene-based polymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer E: a resin layer made of a polypropylene-based polymer and having a melting point of ± 10 ° C. of the melting point of the expanded bead 2.

As the resin layer C of the multilayer sheet 4, the same resin as the base resin of the resin layer A of the multilayer sheet 3 can be used. The resin layer C does not contain an organic crystal nucleating agent or an inorganic filler. The thickness of the resin layer C is arbitrary, but is usually 0.07 to 0.9 mm. The ratio of the thickness of the resin layer C to the total thickness of the multilayer sheet 4 exceeds 0%,
% Or less is preferable. The resin layer C can contain a coloring agent and / or an antibacterial agent. In particular, when the coloring agent is contained in the resin layer C, from the viewpoint of reducing the coloring agent cost,
Even if the content of the coloring agent is reduced, it is preferable to reduce the thickness to some extent so that the coloring effect (the effect of sufficiently and clearly seeing the coloring color and the effect of concealing the surface of the lower layer) can be obtained. . In addition, although a coloring agent can be contained in the resin layers D and E described below, it is most preferable that the coloring agent is contained in the outermost resin layer C in order to obtain a more coloring effect with a smaller coloring agent. .

As the base resin of the resin layer D, the same resin as the resin layer A of the above-described multilayer sheet 3 can be used, and the same resin as the resin layer B can be used. A material containing a crystal nucleating agent and an inorganic filler is used. The thickness of the resin layer D is arbitrary, and is usually from 0.08 to
1.1 mm. The ratio of the thickness of the resin layer D to the total thickness of the multilayer sheet 4 is preferably 35% or more and less than 100%. When the resin layer C is formed thin, it is preferable to increase the thickness of the resin layer D in order to compensate for a decrease in mechanical properties.

As the resin layer E, the multilayer sheet 3 described above is used.
The same resin layer B can be used. Resin layer E
Is arbitrary as in the case of the resin layer B, and is usually 0.0
3 to 0.4 mm. The ratio of the thickness of the resin layer E to the total thickness of the multilayer sheet 4 is more than 0% and preferably 20% or less.

In the present invention, the essential effects of the present invention can be obtained even if the composite molded body 1 is configured as described above.

If the composite molded body 1 is configured as described above,
By adding a coloring agent and / or an antibacterial agent to the resin layer C constituting the multilayer sheet 4, a smaller amount of the coloring agent and the antibacterial agent may be added to the resin layers constituting the other layers as well. The amount can be adjusted to the target concentration or more, which is advantageous in cost when adding expensive additives. In addition, the multilayer sheet 4 can be colored and / or imparted with an antibacterial effect without particularly considering the influence on the rigidity and dimensional stability of the multilayer sheet 4, and the composite molded article 1 is subjected to coloring and / or antibacterial treatment. Can be obtained as Further, as a coloring effect, an effect of concealing the contour pattern of the expanded beads on the surface of the expanded foamed molded article 2 as the lower layer can be obtained.

The coloring agents contained in the resin layer C include titanium white (titanium oxide), quinacridone red, condensed azo organic pigment red, periden orange, condensed azo organic pigment yellow, phthalocyanine organic pigment green and Blue, carbon black and the like can be used. The amount of the coloring agent when the coloring agent is contained in the resin layer C depends on the kind of the coloring agent.
0.05 to 10% by weight, preferably 1 to 7% by weight
It is.

Examples of the antibacterial agent contained in the resin layer C include silver-based antibacterial agents such as silver silica gel, silver zeolite and silver calcium phosphate, and pyrithion-based antibacterial agents such as bis (pyridine-2-thiol-1-oxide) zinc salt. , 2,4,5,6-
Nitrile-based ones such as tetrachloroisophthalonitrile, organic iodine-based ones, benzimidazole-based ones, and triazine-based ones are used. When the antibacterial agent is contained in the resin layer C, the amount of the antibacterial agent depends on the kind of the antibacterial agent, but is usually 0.1 to 5% by weight, preferably 0.5 to 2.5% by weight. is there.

The expanded particles used for forming the expanded molded article 2 portion of the composite molded article 1 usually have an expansion ratio of 5 to 60 times, and preferably 15 to 45 times.

Next, the multilayer sheet for composite molding of the present invention (hereinafter, simply referred to as multilayer sheet) will be described. FIG. 3 is a longitudinal sectional view showing an example of the multilayer sheet of the present invention, and 5 represents a multilayer sheet. The multilayer sheet 5 is used for laminating and integrating a polypropylene-based resin foam (not shown) by heat fusion, and is formed by sequentially laminating resin layers F to H below. Resin layer F: made of polypropylene homopolymer and / or polypropylene block copolymer, and contains a coloring agent and / or
Or a resin layer containing an antibacterial agent. Resin layer G: a resin layer composed of a polypropylene-based polymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer H: a resin layer made of a polypropylene-based polymer and having a melting point within the range of the melting point of the foam to be laminated and integrated ± 10 ° C. The multilayer sheet 5 is used, for example, to obtain the above-described composite molded body. In addition, although the example of the method of laminating and integrating with a polypropylene-based resin foam by thermal fusion and the example of the composite molded body obtained by the method have been described above, the present invention is not limited thereto.

As the resin layer F constituting the multilayer sheet 5, the same resin layer C in the above-described multilayer sheet 4 containing a coloring agent and / or an antibacterial agent can be used. The content of the coloring agent and the antibacterial agent and the types of the coloring agent and the antibacterial agent are the same as those in the case of the resin layer C. The same applies to the ratio of the thickness to the total thickness of the multilayer sheet.

The resin layers G and H may be the same as the resin layers D and E, respectively. The same applies to the ratio of the thickness to the total thickness of the multilayer sheet.

The composite foamed article of expanded polypropylene resin particles of the present invention can be used for various purposes such as transportation containers, packaging materials, building materials, lids for heat storage tanks, and inner wall materials for concrete curing rooms. In particular, it is a material that is used repeatedly for a long period of time as a box, etc. Damage
It is extremely economical because it can be used for a long time without damage.
It is also economical in that material recycling is possible. When the multilayer sheet of the present invention is used, the composite molded article can be easily produced.

[0030]

Next, the present invention will be described in more detail with reference to specific examples. Examples and Comparative Examples 100 sheets shown in Table 1 were placed in a furnace at a furnace temperature of 180 ° C. for 30 seconds and heated, and then vacuum formed,
230 mm long × 23 wide as shown by reference numeral 6 in FIG.
0 mm, depth 110 mm, width 10 mm around the entire top opening
Thus, 100 substantially box-shaped thermoformed bodies (shaped bodies) having the flange portions were obtained. In Table 1, the resin layers A, B, C, and D of the examples are shown.
And E correspond to the resin layers A, B, C, D and E in the above description, respectively. Table 1 shows the physical properties of the sheet.

[0031]

[Table 1]

Next, the thermoformed article of the sheet obtained above was inserted into a molding die, and after the foamed particles were filled in the die cavity by the above-described procedure, the steam pressure was set in the die. 2 kg / cm ² (G) of steam was supplied to perform composite molding to obtain a composite molded article in which the sheet and the foamed particle molded article were fused, laminated and integrated. Table 2 shows the physical properties of the obtained composite molded article.

[0033]

[Table 2]

The melting point measurement methods shown in Tables 1 and 2 were used.
The evaluation criteria for the sheet properties and the composite molded body are as follows. [Measurement of Melting Point of Sheet and Expanded Particle Molded Body] Resin Layer B,
E, a peak of an endothermic peak of a DSC curve obtained when a sample for measurement of 5 to 10 mg is cut out from the single-layer sheet or the foamed particle molded body and the sample is heated to 200 ° C. at a rate of 10 ° C./min. Is the melting point. However, when two or more endothermic peaks appear, the apex temperature of the endothermic peak on the lowest temperature side is defined as the melting point. [Sheet properties] (1) Sheet formability ：: No particular problem. Δ: Drawdown and / or wrinkles of the thermoformed body occurred. (2) Dimensional stability A: No deformation of the flange of the thermoformed body. There is no variation between thermoformed products. ：: Deformation of the flange portion of the thermoformed product was slight. There is no variation between thermoformed products. △ to 変 形: Some deformation of the flange of the thermoformed body. There is a little variation between thermoformed products. Δ: Deformation of the flange portion of the thermoformed article was large. (3) Molding cycle A: 30 seconds or less. ：: More than 30 seconds to less than 40 seconds. Δ: 40 seconds or more. [Physical Properties of Composite Molded Article] (1) Fusing Property ：: Good fusion property between thermoformed article and foamed particle molded article. X: Poor fusion property between the thermoformed article and the foamed particle shaped article. (2) Smoothness of thermoformed body side surface (in Table 2, indicated as smoothness of sheet thermoformed body side surface) ：: No irregularities are observed on thermoformed body side surface. X: Irregularities are observed on the surface of the thermoformed body. (3) Comprehensive evaluation ：: Both the fusing property and the surface smoothness on the thermoformed body side are excellent. X: Other than the above.

[0035]

Since the composite molded article of the present invention is constituted as described above, the appearance is beautiful, the surface is smooth, the dirt is hardly adhered, and the dirt is easy to be removed. Hassle-free. In addition, the rigidity of the surface is high, and it is hard to be damaged, and it is hard to be scratched. Therefore, it can be used for a long time in a beautiful and sanitary state without special cleaning work. In addition, in addition to the above effects, the second composite molded article of the present invention can have a more beautiful appearance by including a coloring agent in the outermost layer. Those containing a coloring agent do not show through the expanded particles, and have a good appearance with excellent design. In addition, by including an antibacterial agent in the outermost layer, it can be made hygienic. Including a colorant and / or an antibacterial agent in the outermost layer of the multilayer structure can achieve a target concentration with a smaller amount of use (a colorant and an antibacterial agent corresponding to the target concentration in the entire layer). Does not change the effect, and only increases the amount of expensive colorant, etc.), is advantageous in terms of cost, and further has properties such as sheet formability of other layers due to the addition of the colorant, etc. The trouble of considering the change can be omitted. Further, the multilayer sheet of the present invention enables the composite molded article as described above to be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing an example of a composite molded article of the present invention.

FIG. 2 is a schematic longitudinal sectional view showing an example of another composite molded article of the present invention.

FIG. 3 is a schematic longitudinal sectional view showing an example of the multilayer sheet of the present invention.

FIG. 4 is a process chart showing an example of a method for producing a composite molded article.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Composite molded object 2 Expanded particle molded object 3 Multilayer sheet A Resin layer A B Resin layer B 4 Multilayer sheet C Resin layer C D Resin layer D E Resin layer E 5 Multilayer sheet F Resin layer FG Resin layer GH Resin layer H

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinji Harada 2-26-19 Engin, Fujisawa-shi, Kanagawa West Hill Shonan Nibankan 301

Claims (4)

[Claims] 1. A molded article made of expanded polypropylene resin particles and a multilayer sheet formed by laminating resin layers A and B in the following order, with the resin layer B side integrally formed as a heat-sealing surface side with the expanded particle molded body. A molded article of expanded polypropylene resin particles, characterized in that it is formed. Resin layer A: a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer B: a resin layer composed of a polypropylene-based polymer and having a melting point within the range of the melting point of the molded article of the foamed polypropylene resin particles ± 10 ° C. 2. A molded article made of expanded polypropylene resin particles and a multilayer sheet formed by laminating the following resin layers C to E integrally with the resin layer E side as a heat-sealing surface side of the expanded particle molded body. A molded article of expanded polypropylene resin particles, characterized in that it is formed. Resin layer C: a resin layer composed of a polypropylene homopolymer and / or a polypropylene block copolymer. Resin layer D: a resin layer made of a polypropylene-based polymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer E: a resin layer composed of a polypropylene-based polymer and having a melting point within the range of the melting point of the molded article of the foamed polypropylene resin particles ± 10 ° C. 3. The composite foamed article of claim 2, wherein the resin layer C contains a coloring agent and / or an antibacterial agent. 4. A multilayer sheet for laminating and integrating with a polypropylene resin foam by heat fusion, wherein
To H. A multilayer sheet for composite molding, wherein the resin layers are sequentially laminated. Resin layer F: made of polypropylene homopolymer and / or polypropylene block copolymer, and contains a coloring agent and / or
Or a resin layer containing an antibacterial agent. Resin layer G: a resin layer composed of a polypropylene-based polymer and containing an organic crystal nucleating agent and / or an inorganic filler. Resin layer H: a resin layer made of a polypropylene-based polymer and having a melting point within the range of the melting point of the polypropylene-based resin foam ± 10 ° C.