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. 04, 1978
Filed:
Aug. 04, 1976
Yoshitaka Etou, Inuyama, JP;
Mikio Matsuoka, Inuyama, JP;
Shizuo Matsumoto, Inuyama, JP;
Takamichi Zoda, Inuyama, JP;
Katsumi Gunji, Inuyama, JP;
Toshihiko Ohta, Otsu, JP;
Kazuo Tamaki, Otsu, JP;
Koichi Matsunami, Otsu, JP;
Tetsushi Murakami, Otsu, JP;
Toyo Boseki Kabushiki Kaisha, Osaka, JP;
Abstract
A process for preparing a biaxially stretched film of polyamide blend, which comprises (1) extruding a polyamide blend in melt to make an unstretched film and (2) stretching the unstretched film first in a machine direction with a stretch speed of about 40,000 to 60,000,000 %/minute in a draw ratio of about 2 to 6 and then in a transverse direction with a stretch speed of about 500 to 100,000 %/minute in a draw ratio of about 2 to 6, or (2') stretching the unstretched film first to make a uniaxially stretched film having a plane orientation index of about 0.6 to 1.5 and then stretching the uniaxially stretched film in a direction being substantially at a right angle to the direction at the previous stretching, said polyamide blend comprising an aliphatic polyamide and a polyamide containing in the molecule at least about 70 mol % of the repeating units constituted with metaxylylenediamine or its mixture with paraxylylenediamine (of which the content is not more than about 30 mol % based on the combined amount of metaxylylenediamine and paraxylylenediamine) and at least one .alpha.,.omega.-aliphatic dicarboxylic acid having 6 to 10 carbon atoms in a proportion of about 97 : 3 to 80 : 20 by weight.