Akzo Nobel Coatings International B.v.

International Coatings Limited

Steve Alister Nixon

Keith Yeats

Susan Elizabeth Borthwick

The present invention relates to compounds suitable to use as curing agents for epoxy systems which can be obtained by reacting an amine-functional compound with an &#x3b1;-&#x3b2; unsaturated acid and/or ester and a mono-functional epoxy compound. The invention further relates to coating compositions comprising these curing agents.

Curing agents for epoxy-functional compounds

Ambient temperature curing coating composition comprising&#x2014;a branched alkoxy-functional polysiloxane having the formula R2-O-[Si(R1)&#x2014;O]&#x2014;R2, wherein each R1 is selected from the group consisting of alkyl, aryl, and alkoxy groups having up to six carbon atoms, and Osi(OR3)groups, wherein each R3 independently has the same meaning as R1, each R2 is selected from the group consisting of hydrogen and alkyl and aryl groups having up to six carbon atoms, and wherein n is selected such that the molecular weight of the polysiloxanes is in the range of from 500 to about 2,000,&#x2014;a catalyst, and&#x2014;an acrylic polymer. The acrylic polymer is substantially free of functional groups that can react with the polysiloxane or with the catalyst in the coating composition.

Ambient temperature curing coating composition

Ambient temperature curing coating composition comprising a polysiloxane having the formula: wherein each R1 is selected from the group consisting of alkyl, aryl, and alkoxy groups having up to six carbon atoms, reactive glycidoxy groups, and OSi(OR3)groups, wherein each R3 independently has the same meaning as R1, each R2 is selected from the group consisting of hydrogen and alkyl and aryl groups having up to six carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxanes is in the range of from 500 to about 2,000, an alkoxysilyl-functional acrylic polymer, and a curing catalyst. The invention further relates to the preparation of an alkoxysilyl-functional acrylic polymer.

Ambient temperature curing coating composition comprising a polysiloxane having the formula: The composition can be used as a protective coating for large structures such as ships, bridges, buildings, industrial plants, or oil rigs.

Ambient temperature curing coating composition comprising a polysiloxane having the formula:wherein each R1 is selected from the group consisting of alkyl, aryl, and alkoxy groups having up to six carbon atoms, reactive glycidoxy groups, and OSi(OR3)groups, wherein each R3 independently has the same meaning as R1, each R2 is selected from the group consisting of hydrogen and alkyl and aryl groups having up to six carbon atoms, and wherein n is selected so that the molecular weight of the polysiloxanes is in the range of from 500 to about 2,000, an alkoxysilyl-functional acrylic polymer, and a curing catalyst. The invention further relates to the preparation of an alkoxysilyl-functional acrylic polymer.

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Whitley Bay, United Kingdom

Steve Alister Nixon