Aqueous radiation curable polyurethane compositions

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/67 (2006.01) C09D 175/14 (2006.01)

Patent

CA 2723464

The invention relates to radiation-curable aqueous composition comprising a high molecular weight ethylenically unsaturated polyurethane obtained from the reaction of a polyisocyanate, at least one hydrophilic compound which is capable to render the polyurethane prepolymer dispersible in aqueous medium, an ethylenically unsaturated compound containing at least two reactive groups capable to react with isocyanate groups and an active hydrogen containing chain extender and a low molecular weight ethylenically unsaturated polyurethane end-capped with an ethylenically unsaturated compound containing essentially one reactive group capable to react with isocyanate groups.

La présente invention concerne une composition aqueuse durcissable par rayonnement comprenant un polyuréthane à insaturation éthylénique de poids moléculaire élevé obtenu par la réaction dun polyisocyanate, au moins un composé hydrophile qui est capable de rendre le prépolymère de polyuréthane dispersible en milieu aqueux, un composé à insaturation éthylénique contenant au moins deux groupes réactifs capables de réagir avec des groupes isocyanate et un extenseur de chaîne contenant de lhydrogène actif et un polyuréthane à insaturation éthylénique de poids moléculaire faible coiffé avec un composé à insaturation éthylénique contenant essentiellement un groupe réactif capable de réagir avec des groupes isocyanate.

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