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:
Nov. 10, 1987
Filed:
Dec. 14, 1984
Applicant:
Inventors:
Keiko Ito, Nakatsugawa, JP;
Michiyasu Ito, Kuwana, JP;
Shoichi Tsuji, Nagoya, JP;
Hisatosi Suzuki, Okazaki, JP;
Shoichi Ito, Nagoya, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ;
U.S. Cl.
CPC ...
521 92 ; 264 41 ; 264147 ; 264154 ; 2642888 ; 2642902 ; 264D / ; 521134 ; 521143 ; 521144 ; 521149 ;
Abstract
A process for producing porous films which comprises blending 100 parts by weight of a polyolefin resin with 50 to 500 parts by weight of barium sulfate preferably having an average particle diameter of 0.1 to 7 .mu.m, melting the resulting resin composition and forming it into a film, and then stretching the film at least uniaxially by a factor of 1.5 to 7.