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. 26, 1995
Filed:
Mar. 18, 1994
Applicant:
Inventors:
Yutaka Taketani, Kunitachi, JP;
Kaoru Iwata, Hachioji, JP;
Hideaki Nitta, Hino, JP;
Utami Yonemura, Hino, JP;
Takeshi Sasaki, Hachioji, JP;
Assignee:
Teijin Limited, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ; B29D / ;
U.S. Cl.
CPC ...
264216 ; 264-134 ; 264-26 ; 524108 ; 528196 ; 528501 ;
Abstract
The present invention is to provide a polycarbonate film excellent in optical properties such as high transparency and a process for producing it. The present invention relates to a polycarbonate film having a specific retardation value, and a process for producing a polycarbonate film by casting a dope onto a support and evaporating the solvent with heat wherein the dope is prepared by dissolving 10 parts by weight of polycarbonate resin in 30 to 150 parts by weight of the solvent mixture which contains more than 60% by weight of dioxolane.