Casting composition
AssigneeSola International Holdings Ltd.
InventorsHuan K. Toh, Chong M. Kok, Michael Pittolo
Life of this patent
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Abstract
A cross-linkable polymeric casting composition including A) a polyoxy alkylene glycol diacrylate or dimethacrylate; B) a monomer having a recurring unit derived from at least one radical-polymerisable bisphenol monomer capable of forming a homopolymer having a refractive index of more than 1.55; and C) a urethane monomer having 2 to 6 terminal groups selected from a group comprising acrylic and methacrylic groups.
Claims23
A cross-linkable polymeric casting composition suitable for use in the formation of a transparent optical article following curing for about one hour, said composition having a viscosity not greater than approximately 200 cps. at 25.degree. C. and consisting essentially of:
- (i) as Component (A), a polyoxyalkylene glycol diacrylate or dimethacrylate having 6 to 14 alkylene oxide repeating units, said Component (A) being present in an amount of from approximately 5 to 60% by weight based upon the total weight of the casting;
- (ii) as Component (B), a monomer having a recurring unit derived from at least one radical-polymerizable bis-ethylenically unsaturated bisphenol monomer capable of forming a homopolymer having a refractive index of more than 1.55, said Component (B) being present in an amount of approximately 10 to 60% by weight based upon the total weight of the casting composition;
- (iii) as Component (C), approximately 2.5 to approximately 20% by weight based upon the total weight of the casting composition of a urethane acrylate or methacrylate monomer having 2 to 6 terminal groups selected from acrylic groups, methacrylic groups, and a mixture of such groups;
- and
- (iv) as Component (D), a polymerization initiator selected from heat initiators, ultraviolet initiators, or combinations of heat initiators and ultraviolet initiators.
A transparent polymeric optical article having a refractive index in the mid-refractive range of from approximately 1.51 to 1.57, and being formed from a polymerizable casting composition consisting essentially of:
- (i) as Component (A), a polyoxyalkylene glycol diacrylate or dimethacrylate having 6 to 14 alkylene oxide repeat units, said Component (A) being present in an amount from approximately 5 to 60% by weight based upon the total weight of the casting composition;
- (ii) as Component (B), a monomer having a recurring unit derived from at least one radical-polymerizable bis-ethylenically unsaturated bisphenol monomer capable of forming a homopolymer having a refractive index of more than 1.55, said Component (B) being present in an amount of approximately 10 to 60% by weight based on the total weight of the casting composition;
- (iii) as Component (C), approximately 2.5 to approximately 20% by weight based upon the total weight of the casting composition of a urethane acrylate or methacrylate monomer having 2 to 6 terminal groups selected from acrylic groups, methacrylic groups, and mixtures of such groups;
- and
- (iv) as Component (D), a polymerization initiator selected from heat initiators, ultraviolet initiators, or combinations of heat initiators and ultraviolet initiators.
Dependencies are inferred from the claim text.