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US 5,310,845 AGranted
Method of preparing curable siloxane polymers containing integral UV absorbers
AssigneeGeneral Electric Company
InventorsWilliam J. Raleigh, Raymond J. Thimineur, James A. Campagna
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Abstract
Novel curable siloxane polymers having integral ultra-violet light absorbers are disclosed which are useful in preparing a variety of commercial silicone products requiring excellent resistance to loss of UV protection due to external forces.
Claims10
A method of preparing a curable siloxane polymer containing integral UV stabilizers comprising those of the following general formula:
- ##STR10## wherein each X is the same or different and represents hydrogen, hydroxyl, hydrocarbon or substituted hydrocarbon or a curable silylated ultraviolet absorbing group provided at least one of X is a curable silylated ultraviolet absorbing group, a is 0, 1 or 2, and b is above about 1, said method comprising:
- (a) mixing a curable solvent and a siloxane to form a siloxane mixture;
- (b) adding to said siloxane mixture a curable silylated UV agent;
- (c) diluting the mixture obtained in step (b) with a co-solvent and mixing to form a solution;
- (d) adding a catalyst selected from aminofunctional silanes, quaternary ammonium salts, organofunctional amines or aminofunctional siloxanes to said solution and reacting.
2 more elements
Dependencies are inferred from the claim text.