Modified polyurethane hotmelt adhesive

Details Modified polyurethane hotmelt adhesive Modified polyurethane hotmelt adhesive

C - Chemistry, Metallurgy

08

G

C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/62 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2311712

Hotmelt polyurethane adhesive compositions which are solid at room temperature and capable of being cured by moisture are obtained by combining the reaction product of a polyisocyanate and a low molecular weight polymer derived from ethylenically unsaturated monomers and containing active hydrogen groups such as hydroxyl with an isocyanate-containing polyurethane prepolymer derived from one or more polyols. The low molecular weight polymer component may, for example, be obtained by free radical polymerization of mixtures of unsaturated monocarboxylic acids, alkyl esters of unsaturated monocarboxylic acids, and/or hydroxyalkyl esters of unsaturated monocarboxylic acids.

Selon cette invention, on obtient des compositions adhésives thermofusibles de polyuréthane qui sont solides à température ambiante et peuvent être durcies par l'humidité en combinant le produit de réaction d'un polyisocyanate et d'un polymère à faible poids moléculaire dérivé de monomères éthyléniquement insaturés et contenant des groupes hydrogène actifs tels que hydroxyle avec un prépolymère de polyuréthane contenant isocyanate et dérivé d'un ou plusieurs polyols. Le composant polymère à faible poids moléculaire peut, par exemple, être obtenu par polymérisation radicalaire de mélanges d'acides monocarboxyliques insaturés, d'alkyl esters d'acides monocarboxyliques insaturés et/ou hydroxyalkyl esters d'acides monocarboxyliques insaturés.

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