Blocked polyisocyanates with built-in hals stabilizer

C - Chemistry – Metallurgy – 07 – D

Patent

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C07D 401/14 (2006.01) C07D 211/58 (2006.01) C08G 18/38 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2219865

Disclosed is a partially or completely blocked polyisocyanate having a built-in hindered amine light stabilizer formed from a blocking agent and an adduct of a diisocyanate and a polyol of the general formula: (see fig.I) (wherein R is H or an alkyl or cycloalkyl group of 1-20 carbon atoms and X is H, -CH2 -CH (OH) -R, -CH3 or -COCH3), the adduct containing 2-20 NCO equivalents per OH equivalent. The blocked polyisocyanate is useful in preparing a urethane product, such as a powder coating composition.

L'invention porte sur un polyisocyanate bloqué complètement ou partiellement, avec un photostabilisateur incorporé, à base d'amine avec empêchement stérique, formé à partir d'un agent de blocage et d'un produit d'addition d'un diisocyanate et d'un polyol de formule générale (fig. I) (où R est H ou un alkyle ou cycloalkyle de 1 à 20 atomes de carbone, X étant H, -CH2 -CH (OH) -R, -CH3 ou -COCH3); le produit d'addition renferme de 2 à 20 équivalents de NCO par équivalent de OH. Le polyisocyanate bloqué est utile pour la préparation de produits de type uréthane, comme les compositions de revêtement en poudre.

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