Thermally Cured Silicone Coating which Can be Adhesively Bonded without Primer
AssigneeSika Technology AG
InventorsWolf-Rudiger Huck, Reto Dohner
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Abstract
A thermally cured silicon coating on a plastic, in particular a thermoplastic, can be adhesively bonded without use of an adhesive primer. Such thermally cured silicon coatings are produced by a process including: application of a silicon composition to the surfaces of a plastic or to the surface of a plastic treated with a plastic primer; air drying of the silicon composition to form a silicone film; baking at a temperature in the range from 80° C. to 200° C.; and application of a bonding agent composition to the silicone film during baking or during the phase of cooling to ambient temperature after baking.
Claims35
A method of producing a thermally cured silicone coating on a plastic, comprising the following steps:
- applying a silicone composition to the surface of a plastic or to the surface of a plastic treated with a plastics primer
- flashing off the silicone composition to form a silicone film
- baking at a temperature between 80° C. and 200° C.
- applying an adhesion promoter composition to the silicone film during baking or during the cooling phase to ambient temperature after baking.
A method for promoting the adhesion of adhesives or sealants of silicone coatings, comprising conducting said promoting with a silicon composition having a solids content of 10% to 30% by weight.
Dependencies are inferred from the claim text.