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:
Feb. 28, 2017
Filed:
Nov. 01, 2012
Konica Minolta, Inc., Tokyo, JP;
Takahiro Takagi, Kanagawa, JP;
KONICA MINOLTA, INC., Tokyo, JP;
Abstract
The purpose of the present invention is to provide a cellulose acetate film having excellent adhesion to a polarizer, and in which there is minimal change in retardation with respect to residual solvent during film stretching. This phase difference film contains cellulose acetate α having a degree of acetyl substitution of 2.1 or less, cellulose acetate β having a degree of acetyl substitution of 2.3-2.5, and a compound having a van der Waals volume of 500 Åto 1000 Åin the amount of 5-10 mass % with respect to the total amount of the cellulose acetate α and the cellulose acetate β, and the phase difference film is stretched.