Ameron, Inc.

Gabriel H Law

Albert P Gysegem

Raymond E Foscante

Pamela J Martinich

Compositions for protecting materials from growth of pestiferous organisms, and particularly for protecting marine surfaces from fouling organisms, are formed from precursors having the formula ##STR1## where m is from 1 to about 10, where each X is independently selected from the group consisting of alkyl and alkoxyalkyl radicals containing less than about 6 carbon atoms and Y, where Y has the formula ##STR2## where R.sub.1 R.sub.2 and R.sub.3 are independently selected from the group consisting of alkyl, cycloalkyl, and aryl radicals, where R.sub.1, R.sub.2 and R.sub.3 contain in combination up to about 18 carbon atoms. The ratio of the tin atoms to silicon atoms in the precursors is at least about 1:50. The precursors can be directly used as an additive for coatings. The precursors can also be used by subjecting them to hydrolysis and polycondensation to form an organotin substituted polysiloxane for use as an additive and a binder for coatings.

Siloxane-tin coatings

Compositions for protecting materials from growth of pestiferous organisms, and particularly for protecting marine surfaces from fouling organisms, are formed from precursors having the formula ##STR1## where m is from 1 to about 10, where each X is independently selected from the group consisting of alkyl and alkoxyalkyl radicals containing less than about 6 carbon atoms and Y, where Y has the formula ##STR2## where R.sub.1, R.sub.2 and R.sub.3 are independently selected from the group consisting of alkyl, cycloalkyl, and aryl radicals, where R.sub.1, R.sub.2 and R.sub.3 contain in combination up to about 18 carbon atoms. The ratio of the tin atoms to silicon atoms in the precursors is at least about 1:50. The precursors can be directly used as an additive for coatings. The precursors can also be used by subjecting them to hydrolysis and polycondensation to form an organotin substituted polysiloxane for use as an additive and a binder for coatings.

Polymeric structures having interpenetrating matrices in cured form comprising an epoxy-polyamine network and a polysiloxane network. The interpenetrating network physical and chemical properties are improved over those of either polymeric component alone. The network can be prepared by simultaneously reacting epoxy resin having at least two oxirane groups with amine curing agent, and having present at least 0.1 equivalent of silane, water being substantially uniformly distributed throughout the mixture in an amount sufficient to bring about substantial hydrolytic polycondensation of the silane to form a cross-linked interpenetrating polymer network. The amine curing agent may be substituted wholly or in part by aminosilane. Sources of silane may include aminosilane and epoxysilane. Relative reaction rates of formation of the polymeric networks are controlled, to get good intertwining of the two polymers.

Interpenetrating polymer network comprising epoxy polymer and

Compositions for protecting materials from growth of postiferous organisms, and particularly for protecting marine surfaces from fouling organisms, are formed from precursors having the formula ##STR1## where m is from 1 to about 10, where each X is independently selected from the group consisting of alkyl and alkoxyalkyl radicals containing less than about 6 carbon atoms and Y, where Y has the formula ##STR2## where R.sub.1, R.sub.2 and R.sub.3 are independently selected from the group consisting of alkyl, cycloalkyl, and aryl radicals, where R.sub.1, R.sub.2 and R.sub.3 contain in combination up to about 18 carbon atoms. The ratio of the tin atoms to silicon atoms in the precursors is at least about 1:50. The precursors can be directly used as an additive for coatings. The precursors can also be used by subjecting them to hydrolysis and polycondensation to form an organotin substituted polysiloxane for use as an additive and a binder for coatings.

Chemically resistant coatings comprise a binder, the major portion of which is prepared by reacting, in the presence of an acidic solution, trialkoxysilanes with aliphatic polyols and/or silicone intermediates. The silanes have the formula ##STR1## where R.sub.1 is selected from the group consisting of alkyl, aryl and cycloalkyl groups containing up to about 6 carbon atoms and each R.sub.2 is independently selected from the group consisting of alkyl, hydroxyalkyl, alkoxyalkyl and hydroxyalkoxyalkyl groups containing up to about 6 carbon atoms. The aliphatic polyols contain an average of at least two carbon bonded hydroxyl groups per polyol. The silicone intermediates have the formula ##STR2## WHERE EACH R.sub.3 is selected from the group consisting of the hydroxy group and alkyl, aryl, and alkoxy groups having up to about 6 carbon atoms. Each R.sub.4 is selected from the group consisting of hydrogen and alkyl and aryl groups having up to about 6 carbon atoms. 'n' is selected so that the average molecular weight of the silicone intermediates is from about 500 to about 2000. In the binder, the weight ratio of silanes to polyols is greater than about 5:1 and the weight ratio of silane to silicones is greater than about 1:1. The weight ratio of silanes to polyols and silicones in combination is less than about 20:1.

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Whittier, CA, United States of America

Gabriel H Law