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. 21, 2012
Filed:
Feb. 27, 2007
Hideo Asano, Osaka, JP;
Akio Naka, Suita, JP;
Hirokazu Niwa, Suita, JP;
Tomoyuki Kuwamoto, Nara, JP;
Hiroyasu Watabe, Suita, JP;
Yoshiyuki Shiotani, Izumisano, JP;
Hideo Asano, Osaka, JP;
Akio Naka, Suita, JP;
Hirokazu Niwa, Suita, JP;
Tomoyuki Kuwamoto, Nara, JP;
Hiroyasu Watabe, Suita, JP;
Yoshiyuki Shiotani, Izumisano, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
The invention provides a retardation film, composed primarily of an acrylic polymer, with transparency, heat resistance, and large retardation. The retardation film of the present invention is composed primarily of an acrylic polymer. The film has an in-plane retardation of from 130 nm to 500 nm, inclusive, per 100 μm thickness at a wavelength of 589 nm. The film has a total light transmittance of not less than 85%. The retardation film has a glass transition temperature of preferably from 110° C. to 200° C., inclusive. The acrylic polymer, which is the primary component, preferably has a lactone ring structure.