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:
Aug. 10, 1993
Filed:
Apr. 29, 1992
Chih-Chiang Chen, Hsinchu, TW;
Rong-Jer Lee, Yun-Lin Hsien, TW;
Industrial Technology Research Institute, Chutung, TW;
Abstract
Disclosed herein are a high-refractive plastic lens resin consisting of a polymeric reaction product obtained by an addition reaction under heat of at least one polyisocyanate represented by the following general formula (I): ##STR1## wherein X is a hydrogen, chlorine or bromine atom or a methyl or ethyl group, Z is a hydrogen atom or a methyl group, 1.ltoreq.a.ltoreq.4, 2.ltoreq.b.ltoreq.4, and a+b.ltoreq.6, with at least one allyl group compound represented by the following general formula (II): ##STR2## wherein R.sub.1 is a phenol, hydroxyl, or amine group, in such amounts that the --NCO/--OH+--NH.sub.2 molar ratio fall within the range from 0.45 to 0.50.