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:
Apr. 10, 2012
Filed:
Apr. 17, 2008
Kiyokazu Hashimoto, Minami-Ashigara, JP;
Tetsuya Yoshida, Fujinomiya, JP;
Masaaki Otoshi, Fujinomiya, JP;
Kiyokazu Hashimoto, Minami-Ashigara, JP;
Tetsuya Yoshida, Fujinomiya, JP;
Masaaki Otoshi, Fujinomiya, JP;
Fujifilm Corporation, Tokyo, JP;
Abstract
A thermoplastic film is transversely stretched, and then transported in a heat-treating zone () such that the ratio (G/D) of an inter-roll distance (G) to a roll lap length (D) is 0.01 to 3, and the ratio (V/V) of an exit-side transporting speed (V) to an entry-side transporting speed (V) is 0.6 to 0.999. The thermoplastic film is heat-treated in the heat-treating zone () at (Tg−20)° C. to (Tg+50)° C., in which Tg is the glass transition temperature of the film. The heat-treated thermoplastic film exhibits an Rth/Re ratio of at least 0.5 and less than 1, an Rth/Re ratio range of 0.01 to 0.1 in the width direction, and a thermal dimensional change of 0.001% to 0.3% under conditions of 80° C. and 200 hours.