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Resin composition and shaped foam article

A technology of resin composition and polymer beads, applied in the field of foam molding, can solve the problems of sticking of extrusion molding products, insufficient foamability, etc.

Active Publication Date: 2010-09-22
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the polypropylene-based resin composition disclosed in JP-A-2001-316510 does not necessarily have sufficient foamability, and it is difficult to obtain a foam with a high expansion ratio or a dense foam with this resin composition. cellular foam
In addition, the polypropylene-based resin composition disclosed in Japanese Patent Application Laid-Open No. 8-225689 was developed to solve the problem of blocking of extruded products (specifically, films), and is not used for the production of hair by injection molding. Foam body

Method used

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  • Resin composition and shaped foam article
  • Resin composition and shaped foam article
  • Resin composition and shaped foam article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7、 comparative example 1

[0127] After uniformly premixing the specified amount of each component shown in Table 1 in the drum, use a twin-screw mixing extruder (TEX44SS 30BW-2V type manufactured by Nippon Steel Works) to extrude at a rate of 30 to 50 kg The obtained premix was kneaded under vent suction at a screw rotation speed of 300 rpm, and the obtained kneaded product was extruded at an extrusion rate of 30 to 50 kg / hr to produce resin composition pellets.

[0128] Using the pellets, injection foam molding was performed using an injection molding machine ES2550 / 400HL-MuCell manufactured by ENGEL (400 tons of clamping force). As a blowing agent, nitrogen in a supercritical state is used.

[0129] injection molding use figure 1A mold having a cavity corresponding to the shape of a molded body with approximate dimensions of 290 mm x 370 mm x 45 mm (height) shown in a schematic perspective view of . It should be noted that the basic cavity gap (initial plate thickness) of the above-mentioned cavity...

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Abstract

It is intended to provide a resin composition comprising a propylene polymer (A), an ethylene-alpha-olefin copolymer (B), and organic polymer beads (C). In the composition, ratios of amounts of the propylene polymer (A) and the ethylene-alpha-olefin copolymer (B) to the total amount of the propylene polymer (A) and the ethylene-alpha-olefin copolymer (B) are from 40 to 95% by mass and from 5 to 60% by mass, respectively, an amount of the organic polymer beads (C) to 100 parts by weight of the total of the propylene polymer (A) and the ethylene-alpha-olefin copolymer (B) is from 0.1 to 20 parts by weight, and a density of the ethylene-alpha-olefin copolymer (B) is from 0.85 to 0.89 g / cm3.

Description

technical field [0001] The present invention relates to a resin composition and a foamed molded body formed therefrom. Background technique [0002] Polypropylene is extremely useful due to its excellent mechanical properties, chemical resistance, and the like, and thus can be widely used in the molding field. [0003] In Japanese Patent Application Laid-Open No. 2001-316510, a copolymer of propylene and α,ω-diene produced using a metallocene-supported catalyst, and a polypropylene-based resin containing a blowing agent in the copolymer are disclosed. A composition, a foam obtained by heating, melting, kneading, and foam-molding the composition, and a foam-molded product obtained by molding the foam. [0004] Japanese Patent Application Laid-Open No. 8-225689 discloses a composition obtained by kneading crosslinked polymer beads in a polypropylene resin, and a stretched film thereof. [0005] However, the polypropylene-based resin composition disclosed in JP-A-2001-316510 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08J9/04C08L23/08
CPCC08L2205/22C08J2423/00C08J2323/12C08L2205/03C08J9/0061C08L23/10C08L23/0815C08L33/12C08J2203/06C08L23/12C08J2323/08C08L2203/14C08L2205/02C08L2666/02
Inventor 中岛浩善藤元隆
Owner SUMITOMO CHEM CO LTD
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