Chemical resistant coating compositions
AssigneeMcDonnell Douglas Corporation
InventorNorman R. Byrd
Life of this patent
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Abstract
A coating having resistance to chemical warfare agents, comprising a cured mixture of (a) a polysiloxane having unsaturated groups available for cross-linking, (b) a polysiloxane containing reactive Si-H groups and (c) an unsaturated compound such as ethyl acrylate to prevent formation of bubbles in the coating due to the liberation of hydrogen from such Si-H groups during curing, and to provide a smooth bubble-free coating. A platinum siloxane catalyst is also employed in the mixture. A representative coating composition is a mixture of compounds (a) polydimethylsiloxane, vinyl dimethylterminated; (b) polymethylhydrosiloxane, and (c) ethyl acrylate; and platinum-divinyltetramethyldisiloxane complex catalyst. The coating composition cures at room temperature and in a relatively short period of time.
Claims20
A coating on a substrate, said coating having resistance to chemical warfare agents, said coating comprising a cured mixture of compounds (a) a combination of dimethylsiloxane-vinylmethylsiloxane copolymer and methyl 3,3,3-trifluoropropylvinylmethylsiloxane copolymer, (b) a polysiloxane containing reactive Si-H groups, and (c) an unsaturated compound effective to absorb hydrogen liberated from said Si-H groups during the curing reaction, and to prevent bubbles from forming in said coating.
A composition capable of being cured to form a smooth coating having resistance to chemical warfare agents, comprising a cured mixture of compounds (a) a combination of dimethylsiloxane-vinylmethylsiloxane copolymer and methyl 3,3,3-trifluoropropyl-vinylmethylsiloxane copolymer, (b) a polysiloxane containing reactive Si-H groups, and (c) an unsaturated compound effective to absorb hydrogen liberated from said Si-H groups during the curing reaction, and to prevent bubbles from forming in said coating, and including a suitable platinum catalyst for the reaction between compounds (a) and (b).
Dependencies are inferred from the claim text.