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US 5,336,797 AGranted
Siloxane macromonomers
AssigneeBausch & Lomb Incorporated
InventorsJoseph A. McGee, Paul L. Valint, Jr.
Life of this patent
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Abstract
Siloxane macromonomers are disclosed which can be copolymerized with hydrophilic monomers or hydrophobic monomers to prepare polymeric materials useful as biomedical devices. The copolymers made from hydrophilic monomers exhibit good oxygen permeability and are particularly suitable for use in contact lenses.
Claims26
An oil soluble, non-surface active siloxane macromonomer represented by the following structural formula:
- B--E--(T).sub.m
- wherein each B is a polymerizable end group containing at least one ethylenically unsaturated group and a functional group which reacts to form an ester, amide, urea, urethane, carbonate or epoxy type linkage with the rest of the macromonomer;
- E is a functionalized chain transfer agent;
- T has the following structural formula:
- ##STR13## wherein n is an integer from 1 to 6, A is O, ##STR14## NH or ##STR15## R.sup.1 is H or CH.sub.3 ;
- and each R.sup.2 is independently selected from a C.sub.1 -C.sub.8 alkyl group, a phenyl group and a group of the following structural formula:
- ##STR16## wherein each Y is independently selected from a C.sub.1 -C.sub.8 alkyl group, a phenyl group and a (R).sub.3 OSi-group wherein each R is independently a lower alkyl group;
- and
- m is an integer from 1 to 120.
6 more elements
An in soluble intermediate polymer useful in the preparation of siloxane macromonomers comprised of the following structural formula:
- E(T).sub.m
- wherein E is a functional chain transfer agent and T has the following structural formula:
- ##STR21## wherein n is an integer, from i to 6, A is O, ##STR22## NH or ##STR23## R is H or CH.sub.3 ;
- and each R.sup.2 is independently selected from a C.sub.1 -C.sub.8 alkyl group, a phenyl group and a group of the following structural formula:
- ##STR24## whereln each Y is independently selected from a C.sub.1 -C.sub.8 alkyl group, a phenyl group and a (R).sub.3 OSi- group wherein each R is independently a lower alkyl group;
- and m is an integer from I to 120.
3 more elements
Dependencies are inferred from the claim text.