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:
Sep. 22, 2015
Filed:
Dec. 04, 2008
Kiyoe Shigetomi, Ibaraki, JP;
Kazunori Futamura, Ibaraki, JP;
Daisuke Ogomi, Ibaraki, JP;
Tetsurou Takeda, Ibaraki, JP;
Akinori Nishimura, Ibaraki, JP;
Mitsuhiko Tsuji, Ibaraki, JP;
Kenrou Murate, Ibaraki, JP;
Kiyoe Shigetomi, Ibaraki, JP;
Kazunori Futamura, Ibaraki, JP;
Daisuke Ogomi, Ibaraki, JP;
Tetsurou Takeda, Ibaraki, JP;
Akinori Nishimura, Ibaraki, JP;
Mitsuhiko Tsuji, Ibaraki, JP;
Kenrou Murate, Ibaraki, JP;
NITTO DENKO CORPORATION, Ibaraki-shi, JP;
Abstract
A method for producing a polarizer of the present invention includes: subjecting a polyvinyl alcohol film to at least a dyeing process, a crosslinking process and a stretching process, then subjecting the film, in which all of the processes have been performed, having a water content of 25 to 55% by weight to a drying process, wherein in the drying process, the water content of the film is reduced by at least 15% by weight, so that the film has a water content of 5 to 35% by weight, and the drying process has a quick drying stage in which the water content of the film is reduced by at least 10% by weight in a time period of ½ to 1/30 of the total drying time of the drying process. The polarizer obtained by the production method has durability and has good optical properties over a wide band.