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:
May. 17, 1983
Filed:
Dec. 31, 1981
Applicant:
Inventors:
Assignee:
Mitsubishi Rayon Company, Limited, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; D01D / ; D01F / ;
U.S. Cl.
CPC ...
428338 ; 156229 ; 264 41 ; 2642107 ; 428523 ; 428910 ;
Abstract
A porous polyethylene film was obtained which is characterized in that micropores are contiguous with one another from one surface to the other surface of the film to constitute a laminar structure, and said micropores assume the form of strips being composed of microfibrils that are arrayed in a direction in which the film is stretched and nodular portions that are coupled to said microfibrils nearly at right angles thereto, wherein the micropores have an average pore diameter over a range of 0.05 to 2 microns as measured using a mercury porosimeter, said film has a porosity over a range of 30 to 90%, and an elastic recovery factor from the 50% stretching ratio is less than 50%.