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:
Oct. 02, 2012
Filed:
Jan. 16, 2008
Kazunori Futamura, Ibaraki, JP;
Junichi Nagase, Ibaraki, JP;
Hiroyuki Yoshimi, Ibaraki, JP;
Masaki Hayashi, Ibaraki, JP;
Kazunori Futamura, Ibaraki, JP;
Junichi Nagase, Ibaraki, JP;
Hiroyuki Yoshimi, Ibaraki, JP;
Masaki Hayashi, Ibaraki, JP;
Nitto Denko Corporation, Ibaraki-shi, Osaka, JP;
Abstract
The object of the present invention is to provide a producing method for a lengthwise optical laminate exhibiting high contrast ratio and adaptable to a large-sized display. The present invention provides a producing method for a lengthwise optical laminate, which comprises a step 1 of coating and drying a coating solution comprising a birefringent material and a solvent on a surface of a lengthwise base material to form a birefringent film such that a birefringence index (Anxz[590]) in the thickness direction at a wavelength of 590 nm is 0.02 or more, and produce a lengthwise sheet (A) comprising the base material and the birefringent film; a step 2 of drawing a lengthwise film of a hydrophilic polymer containing a dichroic material so that a draw ratio is from 3 times to 5 times based on the original length and a neck-in ratio is 55% or less to produce a lengthwise polarizer (B); and a step 3 of laminating the lengthwise sheet (A) obtained in the step 1 on one plane of the lengthwise polarizer (B) obtained in the step 2 to produce the lengthwise optical laminate.