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. 08, 1976
Filed:
Mar. 05, 1974
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JA;
Abstract
Films having good dimensional stability and practically no tendency of fibrillation and also other superior mechanical properties can be obtained easily and at a high production speed by stretching a layer of a substantially amorphous polymer consisting mainly of polyethylene-1,2-diphenoxyethane-4,4'-dicarboxylate at a temperature in the range from Tg to 100.degree.C (wherein Tg is a glass transition point) in the longitudinal direction to 1.5 to 3 times the original length and further stretching the resulting film at a high temperature of 150.degree.C or higher and a high stretching velocity 40000% per minute or higher in the longitudinal direction to give a total stretching ratio of 3.1 times or more.