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. 23, 2017
Filed:
Jan. 31, 2014
Fujifilm Corporation, Tokyo, JP;
Kiyokazu Hashimoto, Shizuoka, JP;
Yohei Aritoshi, Shizuoka, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A polyester film has excellent resistance to hydrolysis, excellent heat resistance in high temperatures and low humidity, and mechanical strength. The polyester film satisfies a stress heat resistant coefficient f(125)≧3 and a wet thermo retention (=100×S(120)/S(0)) of 30% or more. f(125) is a value obtained by substituting t=125° C. in an approximation represented by f(t); t represents a temperature (° C.) at thermo processing; f(t) represents a stress heat resistant coefficient f at the thermo temperature t and represents an approximation to a straight line obtained by linear approximation by a least squares method of values plotted from a relationship between the thermo temperature t and a logarithm (log T(t)) of time T at which a rupture stress is 50% when t is 150° C., 160° C., 170° C., or 180° C.; T(t) is a time (hr) at which the maximum stress in a tensile test after thermo processing at t° C. and 0% RH is 50% of the maximum stress in a tensile test before thermo processing; S(120) is breaking elongation (%) after aging for 100 hours at 120° C. and 100% RH, and S(0) represents a breaking elongation (%) before aging.