Compositions containing rheology modifiers with functional...

C - Chemistry – Metallurgy – 09 – D

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C09D 5/04 (2006.01) C09D 201/02 (2006.01) C09D 201/06 (2006.01)

Patent

CA 2350084

Disclosed are compositions comprised of (a) a polymer containing pendant and/or functional groups selected from the group consisting of carbamate, urethane and/or amide functional groups; and (b) a rheology modifier comprising the reaction product of an amine and an isocyanate; and, optionally, a polymer which is different from the polymer (a) which contains carbamate, urethane and/or amide functional groups. Also disclosed are curable compositions comprised of the compositions described above which further comprise (c) a curing agent having functional groups reactive with the functional groups of the polymer (a). The curable compositions are useful for a variety of applications such as adhesives, sealants and surface coatings where the presence of a carbamate, urethane and/or amide functional polymer in conjunction with the rheology modifier provides improved thixotropy and superior sag resistance.

L'invention concerne des compositions comprenant (a) un polymère contenant des groupes latéraux et/ou fonctionnels sélectionnés dans des groupes fonctionnels; (b) un modificateur de la rhéologie comportant le produit de réaction d'une amine et d'un isocyanate; et éventuellement un polymère qui diffère du polymère (a) et comprend des groupes fonctionnels carbamate, uréthanne et/ou isocyanate. L'invention concerne aussi des compositions durcissables comprenant les compositions ci-décrites, qui comprennent en outre (c) un agent de durcissement comprenant des groupes fonctionnels réagissant avec les groupes fonctionnels du polymère (a). Ces compositions durcissables peuvent avoir une multitude d'applications, par exemple, en tant qu'adhésifs, mastics et revêtements de surface auxquels la présence de polymères à groupes fonctionnels carbamate, uréthanne et/ou isocyanate, combinée à celle du modificateur de rhéologie, confère une meilleure thixotropie et une plus grande résistance à la coulure.

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