One part solventless conformal coatings

Details One part solventless conformal coatings One part solventless conformal coatings

C - Chemistry, Metallurgy

09

D

C09D 183/07 (2006.01) C08L 83/04 (2006.01) C09D 183/04 (2006.01) H05K 3/28 (2006.01)

Patent

CA 2064989

ONE PART SOLVENTLESS CONFORMAL COATINGS Abstract A one-part, solventless silicone conformal coating for use in protecting printed circuits is obtained by mixing a diorganovinyl endblocked polydiorganosiloxane, an organo- siloxane containing at least 3 silicone bonded hydrogen atoms per molecule, a platinum catalyst, an adhesion additive and a cure inhibitor. The adhesion additive is from 1.5 to 2 parts by weight of a mixture of a polysiloxane having both hydroxyl radicals and vinyl radicals and a silane having at least one epoxy-containing group and at least one silicon-bonded alkoxy group, the ratio of the first to the second of from 0.25 to 1.8 parts by weight. The cure inhibitor is less than 0.25 part by weight of an acetylenic Alcohol such as 3,5-dimethylhexyne-3-ol. The composition cures in 10 minutes at less than 100°C.

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