Primer for phenyl-based silicone pressure-sensitive adhesives
AssigneeGeneral Electric Company
InventorStuart Robert Kerr, III
Life of this patent
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Abstract
Silicone primer compositions that provide excellent anchorage for phenyl-based silicone pressure sensitive adhesive prepared tape. The compositions comprise a phenyl-modified siloxane component such as a dimethyl-diphenyl siloxane component. The relative amount of phenyl substituents in the phenyl-modified primer matches the mole percent of phenyl substituents in the adhesive. One particular PSA system includes a primer composition and an adhesive which both contain a dimethyl, 5.3 mole percent diphenyl, silanol chain stopped silicone gum. Very thin layers of the primer are used between a substrate and a pressure sensitive adhesive. The primer compositions virtually eliminate all tendencies of phenyl-based silicone PSA prepared tape to delaminate.
Claims22
A pressure sensitive adhesive tape comprising a substrate, a cured primer composition coated onto said substrate in the form of a primer layer, and a pressure sensitive adhesive layer coated onto said cured primer composition,
- said cured primer composition comprising a cross-linked phenyl-substituted siloxane gum,
- said pressure sensitive adhesive layer comprising a high molecular weight phenyl-substituted, silanol-functional organosiloxane polymer and a silanol-functional resin, said adhesive layer being at least partially cross-linked to said primer layer and securely anchored to said substrate.
A method of securely anchoring a phenyl-based pressure sensitive adhesive composition to a substrate, said method comprising:
- applying a primer composition to said substrate to form a primer layer on said substrate, said primer comprising a phenyl substituted siloxane gum and a cross-linking agent, dispersed in a solvent therefor;
- curing said primer composition with a catalyst to form a cured primer layer on said substrate;
- applying a phenyl-based pressure sensitive adhesive composition comprising a phenyl substituted silanol-functional organosiloxane polymer and a silanol-functional MQ resin, to said cured primer layer;
- and
- curing said phenyl-based pressure sensitive adhesive so as to cross-link said adhesive to said cured primer layer.
Dependencies are inferred from the claim text.