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Improving Adhesion of Silicone Rubber to Substrates

IP.com Disclosure Number: IPCOM000089856D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Spaulding, EC: AUTHOR

Abstract

Coatings of silicone rubber such as Silicone RTV-60, a product of General Electric Company, on various substrates, such as ceramics, aluminum cans, polyimides, or modified polyamide-imides, are usually applied over special preliminary primer coatings to attain adequate adhesion. A primer for polyimide and modified polyamide-imide substrates consists of 1 part by weight of the silane, (CH(2))2Si(OCH(3))(3), and 1 part by weight of the silane, NH(2)(CH(2))(3)Si(OC(2)H(5))(3) in 2 parts by weight of reagent grade toluene.

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Improving Adhesion of Silicone Rubber to Substrates

Coatings of silicone rubber such as Silicone RTV-60, a product of General Electric Company, on various substrates, such as ceramics, aluminum cans, polyimides, or modified polyamide-imides, are usually applied over special preliminary primer coatings to attain adequate adhesion. A primer for polyimide and modified polyamide-imide substrates consists of 1 part by weight of the silane, (CH(2))2Si(OCH(3))(3), and 1 part by weight of the silane, NH(2)(CH(2))(3)Si(OC(2)H(5))(3) in 2 parts by weight of reagent grade toluene.

After being applied by spraying or dip drain, the primer is cured for one half an hour at 110 degrees C. The silicone is then coated on this and also cured. Adhesion is good.

Excellent adhesion of Silicone RTV-60 to the mentioned substrates can be achieved without primers. This is done by adding from 0.5 to 1.5% by weight of gamma-amino-propyltriethoxy silane NH(2)(CH(2))(3)Si(OC(2)H(5))(3) to conventionally catalyzed Silicone RTV-60. The mixture is applied directly on the primer-free materials to be coated. The curing which follows is much more rapid.

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