Aqueous dispersions, which can be hardened thermally and by...

C - Chemistry – Metallurgy – 09 – D

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C09D 175/16 (2006.01) C08G 18/08 (2006.01) C08G 18/62 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C08G 18/81 (2006.01) C09D 5/02 (2006.01)

Patent

CA 2438588

The invention relates to aqueous dispersions, which can be hardened thermally and by using actinic radiation, containing: (I) liquid, highly viscous and/or solid particles that are dimensionally stable under storage and application conditions. Said particles contain: (IA) a binding agent that does not contain any carbon-carbon double bonds, which can be activated with actinic radiation, containing at least one (meth)acrylate copolymer having, in the statistical mean, at least one isocyanate-reactive functional group and at least one dispersed functional group per molecule, and; (IB) at least one blocked polyisocyanate. The aqueous dispersions also contain: (II) liquid, highly viscous and/or solid particles, which are dimensionally stable under storage and application conditions. Said particles contain at least one polyurethane (II) having at least one isocyanate-reactive functional group, at least one functional group with at least one bond that can be activated with actinic radiation, and at least one dispersing functional group. Lastly, the aqueous dispersions contain: (III) at least one unsaturated constituent, which does not contain any isocyanate-reactive functional groups and which, in the statistical mean, contains more than one carbon-carbon double bond per molecule, which can be activated with actinic radiation. The invention also relates to a method for producing the aqueous dispersions and to the use thereof.

L'invention concerne des dispersions aqueuses durcissables par voie thermique et par rayonnement actinique, qui contiennent (I) des particules liquides de haute viscosité et/ou solides, stables en dimensions, dans des conditions de stockage et d'utilisation, lesdites particules contenant : (I A) un liant exempt de liaisons doubles carbone-carbone, activables par rayonnement actinique, contenant au moins un (meth)acrylatcopolymérat avec en moyenne statique au moins un groupe fonctionnel isocyanate réactif et au moins un groupe fonctionnel à effet dispersif dans la molécule et (I B) au moins un polyisocyanate greffé ; (II) des particules liquides, de haute viscosité et/ou solides, stables en dimensions dans des conditions de stockage et d'utilisation, contenant au moins un polyuréthane (II) avec au moins un groupe fonctionnel isocyanate réactif, au moins un groupe fonctionnel avec au moins une liaison activable par rayonnement actinique, ainsi qu'au moins un groupe fonctionnel à effet dispersif, de même (III) qu'au moins un constituant insaturé exempt de groupes fonctionnels isocyanate réactifs et contenant en moyenne statistique plus d'une liaison double carbone-carbone activable par rayonnement actinique dans la molécule. L'invention concerne en outre un procédé permettant de produire lesdites dispersions et leur utilisation.

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