Allophanate group-containing polyisocyanates having improved...

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 275/60 (2006.01) C08G 18/32 (2006.01) C08G 18/73 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C09D 175/02 (2006.01) C09D 175/12 (2006.01)

Patent

CA 2244573

The present invention relates to coating compositions containing a) aldimines and b) polyisocyanates which i) contain 2 to 35 % by weight of allophanate groups, based on the weight of the polyisocyanates, ii) have a viscosity of less than 3000 mPa~s at 25°C when measured at a solids content of 100%, iii) are based on the reaction products of aliphatic polyisocyanates with 1) 10 to 90 mole percent of monohydroxy compounds and 2) 10 to 90 mole percent of polyhydric alcohols, wherein the mole percentages of 1) and 2) add up to 100, and the percentages are based on the total moles of monohydroxy compounds 1) and polyhydric alcohols 2) and iv) contain less than 10 mole percent of urethane groups, based on the total moles of urethane groups obtained from monohydroxy compounds 1) and polyhydric alcohols 2). The present invention also relates to these polyisocyanates containing allophanate groups and to polyisocyanate mixtures containing these polyisocyanates and polyisocyanate adducts containing isocyanurate, uretdione, biuret and/or urethane groups.

La présente invention porte sur des compositions de revêtement, renfermant (a) des aldimines et (b) des polyisocyanates (i) contenant 2 à 35 % en poids de groupes allophanate, par rapport au poids de polyisocyanates, (ii) possédant une viscosité inférieure à 3000 mPa~s à 25 degrés C, mesurée à une teneur en solides de 100 %, (iii) correspondant à des produits de réaction de polyisocyanates aliphatiques avec (1) 10 à 90 % en moles de composés monohydroxylés et (2) 10 à 90 % en moles d'alcools polyhydriques - les pourcentages de (1) et (2) totalisent 100 et sont basés sur le nombre total de moles de composés monohydroxylés (1) et d'alcools polyhydriques (2) - iv) et renferment moins de 10 % en moles de groupes uréthane, pourcentage basé sur le nombre total de moles de groupe uréthane provenant de composés monohydroxylés (1) et d'alcools polyhydriques (2). La présente invention porte également sur les polyisocyanates renfermant des groupes allophanate et sur les mélanges de polyisocyanates contenant ces polyisocyanates et des produits d'addition de polyisocyanates renfermant des groupes isocyanurate, uretdione, biuret et (ou) uréthane.

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