Allophanate modified polyisocyanates

Details Allophanate modified polyisocyanates Allophanate modified polyisocyanates

C - Chemistry, Metallurgy

08

G

C08G 18/22 (2006.01) C08G 18/78 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2602936

A composition that includes isocyanate group containing compounds that include on average i) a NCO functionality less than or equal to 3.5; and ii) from 1.5 to 8 percent by weight, based on the isocyanate containing compound, of allophanate groups; and which is substantially free of uretdione groups. The composition can be used in two component elastomeric coating compositions that include a component A the above-described composition and a component B that includes a compound containing one or more functional groups that are reactive with isocyanate groups. The elastomeric coating compositions can be used to coat substrates.

L'invention concerne une composition qui comprend un groupe isocyanate contenant des composés qui comportent en moyenne : i) une fonctionnalité NCO inférieure ou égale à 3,5 ; et ii) entre 1,5 et 8 % en poids, sur la base du composé contenant de l'isocyanate, de groupes allophanate ; et qui sont sensiblement exempts de groupes uretdione. La composition de l'invention peut être utilisée dans des compositions de revêtement élastomères à deux composants qui comprennent : un composant A tel que décrit précédemment, et un composant B qui comprend un composé contenant un ou plusieurs groupes fonctionnels réagissant avec des groupes isocyanate. Les compositions de revêtement élastomères peuvent servir à revêtir des substrats.

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