Silicone-containing prepolymers

摘要

Prepolymers of Formula (I) are useful in hydrogel materialswhereinM is a hydrophilic radical derived from at least one 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 U is independently a divalent urethane or ureido segment;x is greater than or equal to 1, y is greater than or equal to 1; and z is greater than or equal to 1; andeach E is independently a polymerizable, ethylenically unsaturated radical.