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US 5,969,076 AGranted
Thermoplastic silicone-containing hydrogels
AssigneeBausch & Lomb Incorporated
InventorsYu-Chin Lai, Edmond T. Quinn
Life of this patent
Estimating the term…
Abstract
Thermoplastic silicone-containing composition are useful as a hydrogel contact lens material. The compositions are based on polymers including a siloxane segment and a highly hydrophilic segment.
Claims32
A thermoplastic polymer including units of the formula:
- ##STR6## wherein M is a hydrophilic radical derived from a hydrophilic ethylenically unsaturated monomer and having a molecular weight of about 500 to 5000;
- each R is independently selected from an alkylene group having 1 to 10 carbon atoms wherein the carbon atoms may include ether, urethane or ureido linkages therebetween;
- each R' is independently selected from hydrogen, monovalent hydrocarbon radicals or halogen substituted monovalent hydrocarbon radicals wherein the hydrocarbon radicals have 1 to 18 carbon atoms which may include ether linkages therebetween;
- a is an integer equal to or greater than 1;
- each Z is independently a divalent urethane or ureido segment;
- and x is greater than or equal to 1, and y is greater than or equal to 1.
3 more elements
A contact lens formed of a thermoplastic polymer including units of the formula:
- ##STR8## wherein M is a hydrophilic radical derived from a hydrophilic ethylenically unsaturated monomer and having a molecular weight of about 500 to 5000;
- each R is independently selected from an alkylene group having 1 to 10 carbon atoms wherein the carbon atoms may include ether, urethane or ureido linkages therebetween;
- each R is independently selected from hydrogen, monovalent hydrocarbon radicals or halogen substituted monovalent hydrocarbon radicals wherein the hydrocarbon radicals have 1 to 18 carbon atoms which may include ether linkages therebetween;
- a is an integer equal to or greater than 1;
- each Z is independently a divalent urethane or ureido segment;
- and x is greater than or equal to 1, and y is greater than or equal to 1.
3 more elements
Dependencies are inferred from the claim text.