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:
Dec. 15, 2009
Filed:
Oct. 24, 2003
Takanori Isozaki, Kurashiki, JP;
Tetsushi Hayashi, Kurashiki, JP;
Hajime Nishiuma, Saijyo, JP;
Kuraray Co., Ltd., Kurashiki, JP;
Abstract
The invention provides a continuous method for producing polarizing films that includes a step of monoaxially stretching a polyvinyl alcohol film having a width of at least 2 m in an aqueous boric acid solution, wherein the polyvinyl alcohol film is stretched on the condition that it satisfies the following formulae (1) and (2):A≧5 (m)  (1)≧0.5 (min) (2)wherein A indicates the stretching distance (m); and B indicates the stretched film speed (m/min). The method gives wide polarizing films of wide and good polarization performance, and the polarizing films thus produced are useful as the material for polarizers that may be in large-size liquid-crystal displays.