Process for synthesis of allophanate compounds and...

C - Chemistry – Metallurgy – 07 – C

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C07C 275/60 (2006.01) C07C 273/18 (2006.01) C08G 18/18 (2006.01) C08G 18/78 (2006.01) C09D 5/44 (2006.01) C25D 13/08 (2006.01)

Patent

CA 2355935

The invention provides a process for preparing an allophanate-containing compound in the presence of a metal catalyst and a tertiary amine. In a preferred process, the tertiary amine compound also has a hydroxyl group. The hydroxyl group can react with the isocyanate functionality. Also disclosed is a process in which an allophanate-containing compound is prepared with copper acetate monohydrate as a catalyst. The allophanate-containing compound is used as a curing agent in coating compositions, particularly electrocoat coating compositions. The coating compositions are used to coat articles.

L'invention concerne un procédé de préparation d'un composé contenant un allophanate, en présence d'un catalyseur métallique et d'une amine tertiaire. Dans le procédé préféré de l'invention, le composé d'amine tertiaire possède également un groupe hydroxyle, lequel peut réagir avec la fonctionnalité isocyanate. L'invention porte également sur un procédé dans lequel un composé contenant de l'allophanate est préparé à l'aide de monohydrate d'acétate en tant que catalyseur. Ledit composé contenant de l'allophanate est utilisé comme agent de durcissement dans des compositions de revêtement, notamment des compositions de revêtement déposées selon un procédé électrolytique. Lesdites compositions de revêtement sont utilisées pour l'enduction d'articles.

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