Optical plastics and methods for making the same
OwnerElvin M. Brightinventor
Life of this patent
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Abstract
Ophthalmic lens compositions comprising a cured polymer mixture of (A) an unsaturated polyester resin composition, (B) a monomer of the formula ##STR1## (C) an optional vinyl, acrylate monomer, or other monomer or mixtures thereof, and (D) a free radical generating catalyst system. Such a curable plastic material can form ophthalmic lenses of superior properties including high index of refraction which reduces the amount of material required for corrections.
Claims20
A curable composition comprising:
- (a) about 80-95 parts by weight of an unsaturated polyester resin;
- (b) about 6 to 12 parts by weight of phenoxyethyl acrylate;
- and
- (c) about 0.5 to 2 parts by weight of a free radical catalyst.
A molded ophthalmic lens which comprises a cured plastic formed from a composition comprised of:
- (a) about 80-95 parts by weight of an unsaturated polyester resin;
- (b) about 6 to 12 parts by weight of a phenoxyethyl acrylate or methacrylate;
- and
- (c) about 0.5 to 2 parts by weight of a free radical catalyst.
A molded ophthalmic lens which comprises a cured plastic formed from a composition comprised of:
- (a) about 80-95 parts by weight of an unsaturated polyester resin:
- (b) about 6-12 parts by weight of an ethylenically unsaturated aromatic ester comprises a monomer of the formula:
- ##STR4## wherein each R is independently hydrogen or a C.sub.1-12 alkyl;
- m is an integer of 1 to 6;
- and n is an integer of 1 to 12;
- and
- (c) about 0.5 to 2.0 parts by weight of a free radical catalyst.
A cast product comprising a cured plastic formed from a composition comprising:
- (a) about 84-92 parts by weight of polyester containing less than 40% styrene;
- and
- (b) about 6 to 12 parts by weight of phenoxyethyl acrylic ester;
- wherein the product has a Barcol hardness in excess of 47, and an index of refraction of about 1.56 or greater.
A molded opthalmic lens which comprises a cured plastic formed from a composition comprised of:
- (a) about 80-95 parts by weight of an unsaturated polyester which includes about 28 to 38 wt-% of styrene;
- (b) about 6 to 12 parts by weight of phenoxyethyl acrylate or methacrylate;
- and
- (c) about 0.5 to 2 parts by weight of a free radical catalyst;
- and the lens having an index of refraction of about 1.56 or greater.
A curable composition comprising:
- (a) about 89 parts by weight of an unsaturated polyester resin;
- (b) about 10 parts by weight of phenoxyethyl acrylate;
- and
- (c) about 1.0 part by weight of a free radical catalyst.
Dependencies are inferred from the claim text.