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US 4,622,376 AGranted
Composition of aromatic poly(allylcarbonate), styrene materials, and crosslinker containing three or more ethylenically unsaturated groups for producing polymer of high refractive index and low yellowness
AssigneePPG Industries, Inc.
InventorsMichael S. Misura, Richard A. Schwarz, Stephanie J. Oates
Life of this patent
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Abstract
Pourable, polymerizable compositions comprising aromatic-containing poly(allyl carbonate)-functional material, styrenic material, and monomer having three or more allyl, methallyl, acrylyl and/or methacrylyl groups is free radically polymerized to produce polymerizates having high refractive index, high hardness, and low yellowness. The polymerizates are especially useful in the form of ophthalmic lenses.
Claims26
A pourable, polymerizable composition comprising:
- (a) aromatic-containing poly(allyl carbonate)-functional material comprising aromatic-containing bis(allyl carbonate)-functional monomer, aromatic-containing poly(allyl carbonate)-functional polymer, or a mixture thereof,
- (b) styrenic material, and
- (c) polyethylenic-functional monomer containing three or more ethylenically unsaturated groups selected from allyl, methallyl, acrylyl, and methacrylyl, wherein the weight ratio of said polyethylenic-functional monomer to all ethylenically unsaturated material present in said composition is in the range of from sbout 0.5:100 to about 25:100.
Dependencies are inferred from the claim text.