Powder slurries which can be thermally hardened with actinic...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/81 (2006.01) C08G 18/62 (2006.01) C08G 18/67 (2006.01) C08G 18/80 (2006.01) C09D 175/16 (2006.01)

Patent

CA 2541612

Powder slurries which can be thermally hardened with actinic radiation, containing solid and/or highly viscous particles which are dimensionally stable in storage conditions and conditions of use, comprising (A) at least one binding agent which is free of carbon carbon double bonds, which can be activated by actinic radiation, containing at least one (meth)acrylate copolymer comprising as a statistical average at least one isocyanate-reactive functional group and at least one group forming ions in the molecule, (B) at least one blocked and/or partially blocked polyisocyanate and (C) at least one olefinically unsaturated component which is free of isocyanate-reactive functional groups and containing as a statistical average at least one isocyanate group which is blocked with pyrazol or which is blocked by at least one substituted pyrazol and at least two double carbon-carbon bonds which can be activated with actinic radiation in the molecule, being able to be produced by reacting at least one polyisocyanate with pyrazol and/or at least one substituted pyrazon, in addition to at least one compound containing an isocyanate-reactive functional group and at least two carbon-carbon dual bonds which can be activated with actinic radiation. The invention also relates to a method for the production and use thereof.

L'invention concerne des suspensions pulvérulentes durcissables thermiquement et par rayonnement actinique qui contiennent des particules solides et/ou à viscosité élevée présentant une stabilité dimensionnelle dans des conditions de stockage et d'utilisation, comprenant (A) au moins un liant exempt de doubles liaisons carbone-carbone activables par rayonnement actinique, ce liant contenant au moins un copolymère de (méth)acrylate comportant en moyenne statistique dans la molécule au moins un groupe fonctionnel réactif aux isocyanates et au moins un groupe formant des ions, (B) au moins un polyisocyanate séquencé et/ou partiellement séquencé et (C) au moins un composant oléfiniquement insaturé exempt de groupes fonctionnels réactifs aux isocyanates et contenant en moyenne statistique dans la molécule au moins un groupe isocyanate séquencé avec un pyrazole ou au moins un pyrazole substitué et au moins deux doubles liaisons carbone-carbone activables par rayonnement actinique, ce composant pouvant être produit par réaction d'au moins un polyisocyanate avec un pyrazole et/ou au moins un pyrazole substitué et au moins un composé contenant un groupe fonctionnel réactif aux isocyanates et au moins deux doubles liaisons carbone-carbone activables par rayonnement actinique. L'invention concerne en outre un procédé de production de ces suspensions et leur utilisation.

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