METHOD FOR PRODUCING POLYPROPYLENE-BASED RESIN FOAMED BLOW-MOLDED ARTICLE

WIPO Patent Application WO/2011/118281

A1

Provided is a method for producing a polypropylene-based resin foamed blow-molded article whereby a molded article, which has improved foaming properties and improved blow-moldability of a foamed parison, compared with articles obtained by the existing production methods, and shows a high uniformity of wall thickness over a wide range of density, can be obtained. The method for producing a polypropylene-based resin foamed blow-molded article, which comprises kneading a polypropylene-based resin with a physical foaming agent, extruding the thus obtained foamable resin melt through a die to give a soft foamed parison, inserting the foamed parison in a mold and then blow-molding the same, is characterized in that said polypropylene-based resin comprises a polypropylene-based resin (A) satisfying specific requirements (1) to (3) and a polypropylene-based resin (B) satisfying a specific requirement (4), each in measuring dynamic viscoelasticity imparting a vibration strain at 190oC, and the mixing ratio by weight (A:B) of the resin (A) to the resin (B) is in the range of 100:0.5 to 100:5.

TOKIWA, Tomoo (10-3 Satsuki-cho, Kanuma-sh, Tochigi 14, 〒3220014, JP)
常盤　知生 (〒14 栃木県鹿沼市さつき町１０－３　株式会社ジェイエスピー　鹿沼研究所内 Tochigi, 〒3220014, JP)

JP2011/052846

September 29, 2011

February 10, 2011

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JSP CORPORATION (4-2 Marunouchi 3-chome, Chiyoda-ku Tokyo, 05, 〒1000005, JP)
株式会社ジェイエスピー (〒05 東京都千代田区丸の内三丁目４番２号 Tokyo, 〒1000005, JP)
TOKIWA, Tomoo (10-3 Satsuki-cho, Kanuma-sh, Tochigi 14, 〒3220014, JP)

B29C49/04; C08J9/12; C08L23/10; B29K105/04

HIROSAWA, Kuninori (Akimoto Bldg. 202, 37-18 Yoyogi 1-chom, Shibuya-ku Tokyo 53, 〒1510053, JP)

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