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Pre-expanded noncrosslinked polypropylene resin beads and in-mold expansion moldings

A cross-linked polypropylene and pre-foaming technology, which is applied in the field of in-mold foaming moldings, can solve problems such as undetermined effects and unexpectable effects, and achieve excellent weldability, excellent antistatic properties, and less pollution

Active Publication Date: 2013-07-24
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology suppresses migration of the antistatic agent to the surface of the molded article by cross-linking the polyolefin-based resin used as the base resin, and the effect on non-cross-linked polypropylene-based resins cannot be expected
In addition, the disclosed foam is also a foam obtained by filling an expandable resin composition in a mold and foaming it, and the effect when it is applied to pre-expanded particles has not yet been confirmed.

Method used

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  • Pre-expanded noncrosslinked polypropylene resin beads and in-mold expansion moldings
  • Pre-expanded noncrosslinked polypropylene resin beads and in-mold expansion moldings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0069] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

[0070] 〈Surface resistivity〉

[0071] Using the "Hirester MCP" tester manufactured by Mitsubishi Chemical Corporation, under the conditions of applying a voltage of 500V x 1 minute to the surface of a molded body of 400 x 300 x 50 mm, a measurement temperature of 23 ° C, and a humidity of 50% RH, according to JIS K6911 Determination of surface resistivity. The lower the surface resistivity value, the higher the antistatic property.

[0072] 〈Pollution〉

[0073] Evaluation was performed by directly touching the molded body with hands. A sample with a sticky feeling was rated as x, and a sample without a sticky feeling was rated as ○. In addition, a glass plate of 100×100×1 mm was covered on the surface of the molded body, heat-treated in an oven at 80° C. for 1 week, and then returned to room temperature, and dirt adhering to the ...

manufacture example 1

[0092] After mixing a mixture of 90 parts by weight of polyether / polyolefin block copolymer ("Pelestat 300" manufactured by Sanyo Chemical Industries) and 10 parts by weight of lithium bis(trifluoromethanesulfonyl)imide with a Henschel mixer, It was put into a twin-screw extruder, kneaded and extruded while heating at a temperature of 200° C., cooled in water, and pelletized to obtain an ion-conductive polymer antistatic agent (A).

manufacture example 2

[0094] In Production Example 1, except that lithium bis(trifluoromethanesulfonyl)imide was changed to lithium trifluoromethanesulfonate, the ion-conductive polymer type antistatic agent (B) was obtained by the same method as Production Example 1 .

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Abstract

Pre-expanded noncrosslinked polypropylene-based resin particles are provided, which comprise a noncrosslinked polypropylene-based resin composition that contains 1 wt% to 30 wt% of an ion-conducting polymer-type anti-static agent that is made of an amphiphilic block copolymer and contains an alkali metal salt of a fluoroalkylsulfonic acid; a method for producing an in-mold expansion-molded article of a noncrosslinked polypropylene-based resin is provided, which comprises the step of filling the foregoing pre-expanded particles into a mold capable of being closed but incapable of being hermetically sealed, and heating the same with water vapor so that the particles are molded; and an in-mold expansion-molded article is provided, which is obtained by the foregoing producing method. Pre-expanded noncrosslinked polypropylene-based resin particles that allow for the production of in-mold expansion molded articles that exhibit an excellent anti-static property and are less contaminating, and an in-mold expansion-molded article obtained from the foregoing pre-expanded particles can be provided.

Description

[0001] This application is a divisional application of an invention patent application with an application date of October 30, 2007, an application number of 200780047245.8, and an invention title of "non-crosslinked polypropylene resin pre-expanded particles and in-mold foamed molding". technical field [0002] The present invention relates to non-crosslinked polypropylene resin pre-expanded particles excellent in antistatic properties, an in-mold expanded molded article obtained from the non-crosslinked polypropylene resin pre-expanded particles, and a method for producing the same. Background technique [0003] Compared with the expanded molded article obtained from polystyrene resin pre-expanded particles, the expanded molded article obtained from polypropylene resin pre-expanded particles has better chemical resistance, heat resistance, cushioning, and compression set recovery. It has excellent performance, heat resistance and compressive strength even compared with foam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08K5/42C08J9/18
CPCC08K5/42C08J2323/10C08L53/00C08J9/232C08L2203/14C08L23/10C08L2666/24
Inventor 市村忠行
Owner KANEKA CORP
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