Title:
POLYPROPYLENE-BASED FOAMED SHEET
Document Type and Number:
Japanese Patent JP3314281
Kind Code:
B2
Abstract:
PURPOSE: To obtain the subject sheet excellent in rigidity and impact resistance, useful for transport containers, etc., by adding a foaming agent to a resin composition comprising each specific PP-based block copolymer, ethylene-α-olefin copolymer and high-density PE at specified proportion and then foaming.
CONSTITUTION: The objective sheet 0.2-0.4 in density can be obtained by adding a foaming agent such as azodicarbonamide to a resin composition comprising (A) 90-60wt.% of a PP-based block copolymer 0.5-15 in MI composed of (1) 99-80wt.% of an essentially crystalline PP and (2) 1-20wt.% of an essentially noncrystalline ethylene-α-olefin copolymer, (B) 5-35wt.% of an ethylene-α-olefin copolymer 0.880-0.905 in density and (C) 0-35wt.% of a high-density PE 0.94-0.97 in density, followed by extrusion expansion.
Inventors:
Masaru Sakurai
Koichiro Asao
Akinobu Sakamoto
Koichiro Asao
Akinobu Sakamoto
Application Number:
JP655393A
Publication Date:
August 12, 2002
Filing Date:
January 19, 1993
Export Citation:
Assignee:
Sumika Plastech Co., Ltd.
International Classes:
C08J9/10; C08J9/06; C08L23/08; C08L53/00; (IPC1-7): C08J9/06
Domestic Patent References:
| JP543874A |
Attorney, Agent or Firm:
Takashi Kuboyama (1 person outside)