Curable compositions

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C - Chemistry, Metallurgy

09

D

C09D 175/14 (2006.01) C08G 18/08 (2006.01) C08G 18/28 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/62 (2006.01) C08G 18/79 (2006.01)

Patent

CA 2719573

This invention relates to a curable composition comprising a solvent solution of a mixture comprising: (i) at least one hydroxy-functional acrylic polymer having a Tg of about 25°C or lower; and (ii) at least one hydroxy-functional polyester having a Tg of 0°C or lower; (iii) at least one polyisocyanate having an average functionality of >4; (iv) a metal catalyst, such as a tin compound, for accelerating the isocyanate/hydroxyl reaction; and (v) optionally a pot-life extending amount of propionic acid.

Cette invention concerne une composition pouvant durcir qui comporte une solution de solvant d'un mélange comportant : (i) au moins un polymère acrylique à fonctionnalité hydroxy ayant une Tg d'environ 25°C ou moins, et (ii) au moins un polyester à fonctionnalité hydroxy ayant une Tg de 0°C ou moins; (iii) au moins un polyisocyanate ayant une fonctionnalité moyenne > 4; (iv) un catalyseur métallique, tel qu'un composé de l'étain, pour accélérer la réaction isocyanate/hydroxyle, et (v) facultativement une quantité suffisante pour l'extension de la durée de vie en pot d'acide propionique.

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