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:
Jul. 25, 1995
Filed:
Jan. 13, 1994
Applicant:
Inventors:
Eiichi Kamei, Hirakata, JP;
Yasushi Shimomura, Hirakata, JP;
Assignee:
Ube Industries, Ltd., Yamaguchi, JP;
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29C / ; D01D / ; D01F / ;
U.S. Cl.
CPC ...
264154 ; 2642095 ; 2642105 ; 2642108 ; 2642356 ; 2642888 ; 2642905 ;
Abstract
A process of producing a porous polypropylene hollow fiber or film which comprises a step for forming a large number of micropores in the surrounding wall of said fiber or in said film by drawing a polypropylene hollow fiber or film, which is characterized in that the drawing process is performed at a temperature in the range of 110.degree.-155.degree. C. and at a drawing rate of less than 10%/min.