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:
Sep. 27, 1994
Filed:
Jun. 16, 1993
Chi-Chang Chen, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A plastic optical lens composition comprising about 40-60 wt% of monomer A, which is a hi-functional 3,9-divinylspirobi(m-dioxane); about 60-40 wt% of monomer B, which is either styrene or chlorostyrene; maleic acid di-allyl ester, the amount thereof is about 3-8 wt% of the aggregate amount of monomer A and monomer B; and a free radical polymerization initiator such as benzyl or dicumyl peroxide, the amount thereof is about 1-5 wt% of the aggregate amount of monomer A and monomer B. The plastic lens composition of the present invention exhibits high refractive index, low shrinkage factor, low specific gravity, low water absorption rate, excellent impact resistance and cutting and grinding processability, and can be polymerized using an injection molding process with substantially reduced reaction time.