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. 15, 2004
Filed:
Jul. 16, 2003
Shuji Terasaki, Ibaraki, JP;
Masamichi Akatsu, Ibaraki, JP;
Hisaaki Terashima, Ibaraki, JP;
Yasuhiro Tada, Ibaraki, JP;
Kureha Chemical Industry Co., Ltd., Tokyo, JP;
Abstract
A moistureproof multilayer film, including a composite film having a non-moisture absorbing resin layer and a vapor deposited film of an inorganic oxide or a metal formed on at least one side of the non-moisture absorbing resin layer, the multilayer film having such a layer structure where the vapor deposited film surface of the composite film is laminated through an adhesive layer on a vapor deposited film surface of another composite film or a surface of another non-moisture absorbing resin layer, wherein a total number (n) of the deposited films laminated adjacent to the adhesive layer is 2 to 8, and wherein a moisture permeabihty (W; unit: g/m .day) as measured under conditions of a temperature of 40° C. and a relative humidity of 100% satisfies a relation represented by equation W≦(1/n)×0.20, and a method for producing the moistureproof multilayer film including heat-treating the multilayer film in a hot dry atmosphere having a temperature lower than 140° C. but not lower than 55° C. for at least 10 hours.