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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 the effects of excellent weldability, excellent antistatic properties, and less pollution

Inactive Publication Date: 2009-10-21
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

[0068] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

[0069]

[0070] Using the "Hirester MCP" tester manufactured by Mitsubishi Chemical Corporation, under the conditions of applying a voltage of 500V to the surface of a molded body of 400 x 300 x 50mm x 1 minute, a measurement temperature of 23°C, and a humidity of 50%RH, according to JIS K 6911 Determination of surface resistivity. The lower the surface resistivity value, the higher the antistatic property.

[0071]

[0072] 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 glass plate was determined. A samp...

manufacture example 1

[0091] 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 was mixed with a Henschel mixer , was put into a twin-screw extruder, kneaded and extruded while heating at a temperature of 200° C., and then pelletized after water cooling to obtain an ion-conductive polymer type antistatic agent (A).

manufacture example 2

[0093] 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

technical field [0001] 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 [0002] 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 foamed molded products obtained by pre-expanding polyethylene-based resins, so it has been widely used as cushioning packaging materials and turnover boxes in recent years. However, polypropylene-based resin pre-expanded particles and their foamed molded products have the disadvantage of being...

Claims

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Application Information

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IPC IPC(8): C08J9/18C08J9/228C08K5/42C08L23/10
CPCC08K5/42C08J2323/10C08L53/00C08J9/232C08L2203/14C08L23/10C08L2666/24
Inventor 市村忠行
Owner KANEKA CORP
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