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:
Sep. 23, 1997
Filed:
Nov. 21, 1995
Masaaki Yamanaka, Ibaraki, JP;
Masaki Shiina, Ibaraki, JP;
Oji-Yuka Synthetic Paper Co., Ltd., Tokyo, JP;
Abstract
A uniaxially stretched multilayered film obtained by uniaxially stretching a laminated film at a stretch ratio of from 3 to 10 to form many closed fine voids in each layer, said laminated film comprising a base layer (A) made of a resin composition comprising resinous ingredients comprising from 50 to 90% by weight crystalline polyolefin (a) and from 50 to 10% by weight thermoplastic resin (b) having a lower melting point than the crystalline polyolefin (a) and an inorganic fine powder (c) in an amount of from 0 to 35% by weight based on the sum of the weight of the resinous ingredients and, formed on at least one side of said base layer (A), a surface layer (B) made of a resin composition comprising from 20 to 80% by weight inorganic fine powder (d) and from 80 to 20% by weight crystalline polyolefin (e), said uniaxially stretching being conducted at a temperature lower than the melting point of said crystalline polyolefin (a) and lower than the melting point of said crystalline polyolefin (e) but at a temperature higher than the melting point of said thermoplastic resin (b).