Blocked isocyanates and their use in coating compositions

Details Blocked isocyanates and their use in coating compositions Blocked isocyanates and their use in coating compositions

C - Chemistry, Metallurgy

08

G

C08G 18/79 (2006.01) C08G 18/75 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2577785

The present invention is to thermally dissociative blocked polyisocyanate composition containing isocyanurate moieties wherein the isocyanurate is the reactions product of bis(isocyanotomethyl)cyclohexane wherein the 5 bis(isocyanotomethyl)cyclohexane is a mixture comprising two or more of cis- 1,3 - bis(isocyanotomethyl)cyclohexane, trans- l,3- bis(isocyanotomethyl)cyclohexane, cis-1,4~bis(isocyanotomethyl)cyclohexane and trans-1,4-bis(isocyanotomethyl)cyclohexane with the proviso the composition comprises at least 5 weight percent of the 1,4-isomer. When blended with a polyhydroxyl compound, such blocked isocyanurate poyisocyantes are 10 particularly useful in powder and solvent-based coatings.

L'invention concerne une composition de polyisocyanates bloqués thermiquement dissociatifs contenant des fragments d'isocyanurate, l'isocyanurate étant le produit de réaction de bis(isocyanotométhyl)cyclohexane, le bis(isocyanotométhyl)cyclohexane étant formé d'un mélange de deux ou plusieurs éléments parmi cis-1,3- bis(isocyanotométhyl)cyclohexane, trans-1,3-bis(isocyanotométhyl)cyclohexane, cis-1,4-bis(isocyanotométhyl)cyclohexane et trans-1,4-bis(isocyanotométhyl)cyclohexane à condition que la composition comprenne au moins 5 % en poids du 1,4-isomère. Lorsqu'ils sont mélangés avec un composé de polyhydroxyle, lesdits polyisocyanates d'isocyanurate bloqués sont utilisés, en particulier, dans des revêtements en poudre et à base de solvant.

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