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:
Mar. 06, 2012
Filed:
Aug. 30, 2010
Masayoshi Tabata, Muroran, JP;
Takayoshi Yamazaki, Yamatokoriyama, JP;
Masayoshi Tabata, Muroran, JP;
Takayoshi Yamazaki, Yamatokoriyama, JP;
Muroran Institute of Technology, Hokkaido, JP;
Nitta Corporation, Osaka-shi, JP;
Abstract
There is provided an aromatic polyester suitable for optical applications, which has not only high heat resistance and transparency, but also enhanced fluidity at a relatively low molding temperature of less than 300° C. despite its high molecular weight to be substantially colorless after the molding process. The aromatic polyester of the present invention comprises polyhydric phenol residues and residues of aromatic polycarboxylic acid, acid halide or acid anhydride thereof; wherein the polyhydric phenol residues comprise polyhydric phenol residues represented by Formula (I): —O—Ar—W—Ar—O— and/or Formula (II): —O—Ar—O—, and bulky polyhydric phenol residues represented by Formula (III): —O—Ar—W—Ar—O—; wherein the molar ratio of the polyhydric phenol residues represented by Formula (I) and/or Formula (II) to the polyhydric phenol residues represented by Formula (III) is in the range of 100:0 to 30:70 (exclusive of 100:0).