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US 10,870,731 B2Granted
Method for end-capping a polysiloxane prepolymer
AssigneeBausch & Lomb Incorporated
InventorsIvan M. Nuñez, Katie L. Poetz, Andrew J. Hoteling, Joseph W. Hoff, Lynn Coullard, Analuz Mark, Keyla M. Cubi, Joseph A. McGee
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Abstract
A method is disclosed which involves the steps of (a) reacting a polysiloxane prepolymer having reactive functional end groups with a non-free radical polymerizable reactive end-capping agent; and (b) reacting the reaction product of step (a) with a free radical polymerizable reactive end-capping agent.
Claims23
A method comprising the steps of:
- (a) reacting a polysiloxane prepolymer having reactive functional end groups with a non-free radical polymerizable reactive end-capping agent, wherein the non-free radical polymerizable reactive end-capping agent is one of a carbonyl-containing non-free radical polymerizable reactive end-capping agent of the general formula:
- wherein R8 is a non-reactive moiety and C(O)X is a non-free radical polymerizable reactive group, or a chloroformate of the general formula:
- wherein R8 has the aforestated meaning;
- and
- (b) reacting the reaction product of step (a) with a free-radical polymerizable reactive end-capping agent.
2 more elements
Dependencies are inferred from the claim text.