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. 04, 1997
Filed:
May. 25, 1995
Masaki Nishiguchi, Chiba, JP;
Toshimasa Tokuda, Iyo, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Teijin Chemicals, Ltd., Tokyo, JP;
Abstract
There is provided an aromatic polycarbonate obtained by reacting a carbonate precursor substance with a dihydric phenol comprising mainly 2,2-bis(4-hydroxyphenol)-1,1,1,3,3,3-hexafluoropropane having specific characteristics. This aromatic polycarbonate has the following characteristics. That is, with respect to 5 wt % solution of the aromatic polycarbonate in methylene chloride, after being filtered through a filter having a pore diameter of 0.1 .mu.m, the light transmittance at 400 nm measured by using a quartz cell having an optical path length of 250 mm, is 85% or more in terms of light transmittance per cm of the polymer; and when 0.7 g of the aromatic polycarbonate is dissolved in 100 ml of methylene chloride, the specific viscosity of the thus obtained solution measured at 20.degree. C., is in the range of 0.160 to 0.418. The aromatic polycarbonate is excellent in heat resistance and transparency and good in moldability, and is suitable for a plastic optical waveguide that is small in transmission loss and excellent in heat resistance.