US 5,453,467 A · Polymer treatments

Abstract

A graft polymer obtainable by grafting a polymer substrate with a compound of formula (I), in which the groups R are the same or different and each is a straight or branched C.sub.1 -C.sub.4 alkyl group; X is an aryl group or a straight or branched C.sub.1 -C.sub.20 alkylene group, optionally containing one or more carbon-carbon double or triple bonds, ether linkages or aryl groups; the aryl groups being unsubstituted or substituted by one or more C.sub.1-4 alkyl groups; n is from 2 to 4; and A is a reactive group, is useful as a biocompatible material in contact lenses, biomedical devices and blood-containing devices. In a preferred embodiment A is a polymerizable group and the graft polymer is produced by radical initiated polymerization of the compound of formula (I) on the substrate which is initiated by a radical-forming group on the substrate.

Claims23

Dependent claims

A graft polymer obtained by grafting a polymer substrate with a compound of the formula (IIA):

in which the groups R are the same or different and each is a straight or branched C.sub.1 -C.sub.4 alkyl group;
X is a straight or branched C.sub.1 -C.sub.20 alkylene group, optionally containing one or more carbon-carbon double or triple bonds, ether linkages or aryl groups;
the aryl groups being unsubstituted or substituted by one or more C.sub.1-4 alkyl groups;
n is from 2 to 4;
R.sup.1 is hydrogen or straight or branched C.sub.1 -C.sub.4 alkyl, and Y is --O-- or --NR.sup.2 -- where R.sup.2 is hydrogen or straight or branched C.sub.1 -C.sub.4 alkyl
and the substrate has halogen substituted groups which can form free radicals, the grafting reaction being initiated by formation of a radical on the substrate at the halogen substituted group followed by reaction of the radical with the ethylenic group of compound (IIA).

3 more elements

Dependencies are inferred from the claim text.

Polymer treatments

Life of this patent

Polymer treatments

Life of this patent

Abstract

Claims23