Contact lens and process for preparation thereof
First Claim
1. An oxygen-permeable contact lens consisting essentially of a polymer having an organic polysiloxane skeleton and a three-dimensional crosslinked structure, said polymer comprising structural units comprising (A) a residue represented by the following formula:
- ##STR14## wherein R1 and R2 each stand for an organic residue, (B) a residue connected to residue (A) comprising at least one compound selected from the group consisting of unsaturated carboxylic acids, monoalkyl esters of unsaturated dicarboxylic acids, monoalkyl and dialkyl esters of unsaturated tricarboxylic acids, hydroxyalkyl esters of unsaturated carboxylic acids, acrylamide, methacrylamide, vinyl ethers, and styrene derivatives having an active hydrogen atom, (C) a polydimethylsiloxane residue connected to residue (A) modified with an active hydrogen-containing functional group, which is represented by the following general formula;
##STR15## wherein l and m stand for an integer of 0 to 200, n is an integer of 1 to 200, and R4 stands for ##STR16##
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Abstract
An oxygen-permeable contact lens consisting essentially of a polymer having an organic polysiloxane skeleton and a three-dimensional crosslinked structure, and a process for the preparation thereof. The polymer comprises structural units comprising (A) a residue of a trifunctional isocyanate, (B) a residue of at least one compound selected from the group consisting of unsaturated carboxylic acids, monoalkyl esters of unsaturated dicarboxylic acid, monoalkyl and dialkyl esters of unsaturated tricarboxylic acids, hydroxyalkyl esters of unsaturated carboxylic acids, acrylamide, methacrylamide, vinyl ethers, and styrene derivatives having an active hydrogen atom, (C) a polydimethylsiloxane residue modified with an active hydrogen-containing functional group, and (D) a residue of at least one compound selected from the group consisting of alkyl esters of acrylic acid, alkyl esters of methacrylic acid, fluorine-containing acrylates, fluorine-containing methacrylates, acrylates and methacrylates having an alicyclic hydrocarbon group, aryl acrylates and methacrylates, halogen-containing aryl acrylates and methacrylates, styrene, styrene derivatives, alkyl esters of unsaturated carboxylic acids.
110 Citations
9 Claims
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1. An oxygen-permeable contact lens consisting essentially of a polymer having an organic polysiloxane skeleton and a three-dimensional crosslinked structure, said polymer comprising structural units comprising (A) a residue represented by the following formula:
- ##STR14## wherein R1 and R2 each stand for an organic residue, (B) a residue connected to residue (A) comprising at least one compound selected from the group consisting of unsaturated carboxylic acids, monoalkyl esters of unsaturated dicarboxylic acids, monoalkyl and dialkyl esters of unsaturated tricarboxylic acids, hydroxyalkyl esters of unsaturated carboxylic acids, acrylamide, methacrylamide, vinyl ethers, and styrene derivatives having an active hydrogen atom, (C) a polydimethylsiloxane residue connected to residue (A) modified with an active hydrogen-containing functional group, which is represented by the following general formula;
##STR15## wherein l and m stand for an integer of 0 to 200, n is an integer of 1 to 200, and R4 stands for ##STR16## - View Dependent Claims (3, 4, 6, 7, 8, 9)
- ##STR14## wherein R1 and R2 each stand for an organic residue, (B) a residue connected to residue (A) comprising at least one compound selected from the group consisting of unsaturated carboxylic acids, monoalkyl esters of unsaturated dicarboxylic acids, monoalkyl and dialkyl esters of unsaturated tricarboxylic acids, hydroxyalkyl esters of unsaturated carboxylic acids, acrylamide, methacrylamide, vinyl ethers, and styrene derivatives having an active hydrogen atom, (C) a polydimethylsiloxane residue connected to residue (A) modified with an active hydrogen-containing functional group, which is represented by the following general formula;
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2. in which p is an integer of 1 to 30, q and r stand for an integer of 0 to 30, s is an integer of 1 to 25 and t is an integer of 0 to 30,
copolymerized with (D) a residue of at least one compound selected from the group consisting of alkyl esters of acrylic acid, alkyl esters of methacrylic acid, fluorine-containing acrylates, fluorine-containing methacrylates, acrylates and methacrylates having an alicylic hydrocarbon group, aryl acrylates and methacrylates, halogen-containing aryl acrylates and methacrylates, styrene, styrene derivatives, dialkyl esters of unsaturated dicarboxylic acids and trialkyl esters of tricarboxylic acids wherein unit (A) connects an organic polysiloxane skeleton to a skeleton consisting of the residue of unit (D) through unit (B).
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5. A process for the preparation of a contact lens, which comprises addition reacting (A) 1 to 40% by weight of a trifunctional isocyanate represented by the following formula:
- ##STR17## wherein R1 and R2 each stand for an organic residue, (B) 1 to 40% by weight of a monomer having a polymerizable double bond and an active hydrogen atom, (C) 20 to 80% by weight of a polydimethylsiloxane modified with an active hydrogen-containing functional group, which is represented by the following general formula;
##STR18## wherein l an m stand for an integer of 0 to 200, n is an integer of 1 to 200, and R4 '"'"' stands for ##STR19## in which p is an integer of 1 to 30, q and r stand for an integer of 0 to 30, s is an integer of 1 to 25 and t is an integer of 0 to 30;and (D) 20 to 80% by weight of a hydrophobic monomer having a polymerizable double bond and having no active hydrogen atom;
wherein components (A), (B), and (C) undergo an addition reaction and components (B) and (D) undergo a vinyl polymerization; and
forming a contact lens from the reaction product.
- ##STR17## wherein R1 and R2 each stand for an organic residue, (B) 1 to 40% by weight of a monomer having a polymerizable double bond and an active hydrogen atom, (C) 20 to 80% by weight of a polydimethylsiloxane modified with an active hydrogen-containing functional group, which is represented by the following general formula;
Specification