Compositions and processes producing scratch resistant polysiloxane coatings
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United States of America Patent
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Jul 11, 1989
Issued Date -
N/A
app pub date -
Nov 7, 1988
filing date -
Sep 19, 1985
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Expired
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Abstract
A prepolymer composition for forming a scratch-resistant coating, comprising an acidic, aqueous solution of a polysiloxane prepolymer having non-coreactive side groups and co-reactive side groups other than hydrolysable groups, the composition being curable by evaporation of solvent and a decrease in acidity causing the co-reactive groups to react together to cross-link the polymer. Suitable co-reactive side groups are amino, epoxy and thiol. Suitable non-coreactive side groups are alkyl and gamma methacryloxy propyl. Acidity is suitably achieved by using a volatilisable organic acid such as acetic acid, so that it evaporates with the solvents to decrease the acidity.
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