Dual cure emulsions

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 33/04 (2006.01) C08F 283/00 (2006.01) C08F 290/06 (2006.01) C08L 57/00 (2006.01) C09D 4/06 (2006.01) C09D 133/04 (2006.01) C09D 157/00 (2006.01)

Patent

CA 2487520

The invention concerns an aqueous polymer dispersion composition comprising for 100 parts by weight of (A) + (B) :(A) from 30 to 99 parts by weight of at least one dispersed polymer containing acetoacetoxy-type functional moieties, the said polymer having a glass transition temperature from 0 to 100~C ; and(B) from 1 to 70 parts by weight of a multifunctional acrylate, said aqueous composition further containing a volatile base in an amount sufficient to convert the acetoacetoxy functionalities of (A) to enamine ones. The invention does also concern a process of preparation, a coating composition comprising the said composition as a binder, its uses in industrial coatings and a dual cure process of coating.

L'invention concerne une composition de dispersion aqueuse polymère comprenant, sur 100 parties en poids de (A) + (B) : (A) 30 à 99 parties en poids d'au moins un polymère en dispersion contenant des fractions fonctionnelles de type acétoacétoxy et présentant une température de transition vitreuse comprise entre 0 et 100 ·C ; et (B) 1 à 70 parties en poids d'un acrylate multifonctionnel. La composition aqueuse selon l'invention contient également une quantité suffisante d'une base volatile pour convertir les fonctionnalités acétoacétoxy de (A) en fonctionnalités énamine. Cette invention se rapporte en outre à un procédé de préparation de ladite composition, à une composition de revêtement contenant cette composition en tant que liant, à l'utilisation de ladite composition dans des revêtements industriels ainsi qu'à un procédé d'application de revêtement à durcissement double.

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