Polypropylene-based resin molded article and process for producing the same

Inactive Publication Date: 2006-05-04
NEW JAPAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
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Benefits of technology

[0006] An object of the present invention is to provide a crystalline propylene-based resin molded article free of the above problems and havin

Problems solved by technology

However, the molded articles thus obtained are liable to vary in characteristics, especially in impact resistance, and do not necessarily have satisfactory impact strength.
Specifically, some of the molded arti

Method used

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  • Polypropylene-based resin molded article and process for producing the same
  • Polypropylene-based resin molded article and process for producing the same
  • Polypropylene-based resin molded article and process for producing the same

Examples

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example 1

[0093] N,N′-dicyclohexyl-2,6-naphthalenedicarboxamide as a β crystal nucleating agent (0.04 parts by weight), Irganox 1010 (tradename, product of Ciba Specialty Chemicals) as an oxidation stabilizer (0.05 parts by weight), and Irgafos 168 (tradename, product of Ciba Specialty Chemicals) (0.05 parts by weight) were mixed with a propylene homopolymer with a MFR of 2.0 g / 10 min (100 parts by weight), using a Henschel mixer. The resulting mixture was melted, kneaded and extruded at 250° C., and then cooled and cut to prepare β-nucleating agent-containing resin pellets.

[0094] The resin pellets were heated at 250° C. to dissolve the amide compound in the molten propylene homopolymer, and the melt was injection-molded at a mold temperature of 80° C. In this manner, several types of test pieces were obtained and tested for the above properties. Table 1 presents the results.

[0095] Complete dissolution of the amide compound in the molten polypropylene was confirmed by visually observing the...

example 2

[0096] Test pieces were prepared in the same manner as in Example 1 except that the β crystal nucleating agent was used in an amount of 0.05 parts by weight. The test pieces were tested for the properties. Table 1 presents the results.

example 3

[0097] Test pieces were prepared in the same manner as in Example 1 except that the β crystal nucleating agent was used in an amount of 0.06 parts by weight. The test pieces were tested for the properties. Table 1 presents the results.

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Abstract

The present invention provides a crystalline polypropylene-based resin molded article having an excellent impact resistance, in particular a remarkably high Izod impact strength, and a process for producing the molded article. A polypropylene-based resin molded article with an excellent impact resistance in which the β crystals of the polypropylene-based resin are unoriented can be produced by a process comprising the steps of: adding 0.01 to 0.1 parts by weight of at least one amide compound to 100 parts by weight of a polypropylene-based resin; kneading the resulting mixture at a temperature not lower than the dissolution temperature of the amide compound in the molten polypropylene-based resin until the compound dissolves in the molten polypropylene-based resin; and injecting and/or extruding the resulting melt in such a state that the amide compound has dissolved in the molten polypropylene-based resin.

Description

CROSS REFERENCE TO RELATED APPLICATION [0001] This application is a continuation of Ser. No. 10 / 485,814, filed Feb. 10, 2004, which is a 35 U.S.C. 371 application of international application No. PCT / JP02 / 08909 filed Sep. 3, 2002, which is based on Japanese Application No. 2001-276964 filed Sep. 12, 2001.TECHNICAL FIELD [0002] The present invention relates to a crystalline polypropylene-based resin molded article having an excellent impact resistance, in particular, having a remarkably high Izod impact strength, and a process for producing the same. BACKGROUND ART [0003] Crystalline polypropylene has been widely used in recent years in a variety of molding materials, owing to its excellent mechanical properties and high recyclability. Crystalline polypropylene has α, β and γ forms, and it is broadly known that the β form (hereinafter referred to as “β crystals”) has interesting properties, such as a lower melting point, a higher heat distortion temperature, and a higher impact resis...

Claims

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Application Information

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IPC IPC(8): D01F1/02C08J5/00C08K5/20
CPCC08J5/00C08J2323/12C08K5/20C08L23/10C08J5/02
Inventor SADAMITSU, KIYOSHIHOKI, MANABUIKEDA, NAOKIOGINO, KOICHI
Owner NEW JAPAN CHEM CO
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