Mixture which can be thermally hardened and hardened by...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/81 (2006.01) C08G 18/62 (2006.01) C08G 18/72 (2006.01) C08G 18/80 (2006.01) C08J 3/24 (2006.01) C09D 175/16 (2006.01)

Patent

CA 2438583

A mixture which can be thermally hardened and hardened by actinic radiation, containing (A) a bonding agent which is devoid of carbon-carbon dual bonds which can be activated with actinic radiation, containing at least one (meth)acrylate copolymer having on a statistical average at least one isocyanate-reactive functional group in a molecule and a glass transition temperature Tg of -40 to +80 ~C, (B) at least one blocked and/or unblocked polyisocyanate having at least one soft, flexibilizing segment which, as a component of three-dimensional polymer networks, lowers the glass transition temperature Tg thereof, and (C) at least one unsaturated polyfunctional urethane which is devoid of isocyanate-reactive functional groups and which contains, on a statistical average, more than four carbon-carbon dual bonds which can be activated by means of actinic radiation and at least one indurating segment in a molecule, said indurating segment raising the glass transition temperature Tg as a component of three-dimensional polymer networks. The invention also relates to a method for the production and use thereof.

Mélange pouvant être durci thermiquement et par le rayonnement actinique, constitué (a) d'un liant exempt de liaisons doubles carbone-carbone pouvant être activées par le rayonnement actinique, qui contient au moins un copolymère (méth)acrylate possédant en moyenne statistique au moins un groupe fonctionnel réagissant à l'isocyanate dans la molécule et présentant une température de transition vitreuse Tg de 40 à +80 ·C, (b) d'au moins un polyisocyanate inhibé et / ou non inhibé possédant au moins un segment mou et flexibilisant qui abaisse, en tant que partie intégrante de réseaux polymères tridimensionnels, la température de transition vitreuse Tg desdits réseaux et (c) d'au moins un uréthanne polyfonctionnel insaturé qui est exempt de groupes fonctionnels réagissant à l'isocyanate et qui contient en moyenne statistique plus de quatre liaisons doubles carbone-carbone pouvant être activées par le rayonnement actinique et au moins un segment durcisseur dans la molécule, le segment durcisseur augmentant, en tant que partie intégrante de réseaux polymères tridimensionnels, la température de transition vitreuse Tg desdits réseaux. La présente invention concerne également un procédé de préparation dudit mélange et son utilisation.

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