Ppg Industries, Inc.

Stephanie J Oates

Richard A Schwarz

Charles R Coleman

Michael S Misura

Edward J Sare

Vaikunth S Prabhu

Donald A Reich

Catherine C Doyen

James Colton

Ophthalmic lenses and lens blanks having high refractive index and high heat distortion temperature are produced by polymerizing a polymerizable, homogeneous composition comprising epichalcogen resin, aliphatic polythiol, and cyclic anhydride.

Polymers of high refractive index and high heat distortion temperature

1,1,1-Trichloroethane (viz., methylchloroform) is stabilized with from about 2 to about 4 percent by weight 1,3-dioxolane, from about 0.25 to about 0.5 percent by weight butylene oxide, from about 0.25 to about 2 percent by weight nitromethane, from about 0.2 to about 0.75 percent by weight 1-nitropropane, from about 0.75 to about 2 percent by weight secondary butanol, and from 0 to about 100 parts per million by weight acetaldehyde dimethylhydrazone.

Stabilized 1,1,1-trichloroethane compositions

Polymerizable, liquid, substantially gel-free, partially polymerized monomer compositions having allylic utilizations greater than 50 percent can be prepared if the monomer which has been partially polymerized is bis(allylic carbonate) monomer of at least one 4,4'-(alkylidene)-bis[phenol], bis(allylic carbonate) monomer of at least one 4,4'-[phenylenebis(alkylidene)]bis [phenol], or a mixture thereof.

Partially polymerized bis(allylic carbonate) monomer having high allylic

Polymerizable compositions comprising 4,4'(1-phenylethylidene)bis[phenol] bis(allyl carbonate) monomer or prepolymer are useful for preparing polymerizates of high refractive index.

Compositions for producing polymers of high refractive index

(Allylic carbonate)-functional compounds containing three phenylene groups are useful for forming polymers.

Compositions for producing polymers of high refractive index and low

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.

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Wadsworth, OH, United States of America

Stephanie J Oates