Polymerizable polyol (allyl carbonate) compositions

Details Polymerizable polyol (allyl carbonate) compositions Polymerizable polyol (allyl carbonate) compositions

2007-05-08

2007-05-08

Sergent, Rabon (Department: 1711)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C348S902000, C359S642000

Reexamination Certificate

active

10336118

ABSTRACT:
A polymerizable composition is described, which composition comprises a major amount of a polyol(allyl carbonate) monomer, e.g., diethylene glycol bis(allyl carbonate) monomer, and a minor amount of a radically polymerizable second monomer represented by the general formula,wherein R2is a polyvalent linking group that is free of urethane linkages, e.g., R2may be a residue of a polyisocyanate, such as isophorone diisocyanate; R3is a residue of a material having a single hydroxy group and at least one allyl group, R3being free of urethane linkages, e.g., R3may be a residue of a poly(alkylene glycol) allyl ether, such as poly(1,2-propylene glycol) allyl ether; and j is a number from 2 to 4. The second monomer may also be present in the composition in an amount at least sufficient such that a polymerizate, e.g., a plus ophthalmic lens, obtained from the composition is substantially free of tinting defects, e.g., ferns and/or moons.

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