The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 2000
Filed:
Mar. 23, 1999
Applicant:
Inventors:
Hidehiro Sasaki, Kawachi-gun, JP;
Masakazu Sakaguchi, Kanuma, JP;
Mitsuhiro Akiyama, Utsunomiya, JP;
Hisao Tokoro, Utsunomiya, JP;
Assignee:
JSP Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J / ; C08J / ; C08J / ;
U.S. Cl.
CPC ...
521 60 ; 521 56 ; 521143 ;
Abstract
Disclosed herein are foamed and expanded beads of a polypropylene resin for molding, which comprise an uncrosslinked propylene random copolymer having a melting point of at least 140.degree. C. as a base resin, wherein the time required to attenuate an air pressure within the foamed beads applied by a pressurizing treatment with air from 1.2 kgf/cm.sup.2 (G) to 0.8 kgf/cm.sup.2 (G) under atmospheric pressure at 23.degree. C. is at least 80 minutes, and the CNI value of the foamed beads, which is defined by the following equation (1):