High refractive index plastic lens composition

Details High refractive index plastic lens composition High refractive index plastic lens composition

1993-06-16

1994-09-27

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526293, 526327, 526347, 526227, C08F22400, C08F21402, C08F22040, C08F21208, C08F 434

Patent

active

053508220

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.

REFERENCES:
patent: 2975156 (1961-03-01), Fekete
patent: 4342863 (1982-08-01), Hohokabe et al.

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