Polyurethane-prepolymers comprising nco groups and a low...

Details Polyurethane-prepolymers comprising nco groups and a low... Polyurethane-prepolymers comprising nco groups and a low...

C - Chemistry, Metallurgy

08

G

C08G 18/12 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C09J 175/04 (2006.01)

Patent

CA 2431961

The invention relates to the production and use of a polyurethane-prepolymer comprising isocyanate groups and a low content of monomeric polyisocyanate. The polyurethane-prepolymer can be obtained by mixing at least one reactive constituent (I), which contains urethane groups, with at least one polyisocyanate (II), which contains few monomers and which contains urethane groups. The inventive PU prepolymer is suited for adhering plastics, metals and papers and, in particular, for flexible packagings. Despite having a low content of monomeric polyisocyanate, the inventive PU prepolymer is characterized by having a high content of isocyanate and a customized viscosity.

L'invention concerne la production et l'utilisation d'un prépolymère polyuréthane comportant des groupes isocyanate et une faible teneur en polyisocyanate monomère, obtenu par mélange d'au moins un constituant réactif (I) contenant des groupes uréthane, avec au moins un polyisocyanate (II) de type monomère contenant des groupes uréthane. Ce prépolymère PU s'utilise pour coller des matières plastiques, des métaux et de papiers et notamment des emballages souples. Ce prépolymère PU se caractérise en ce qu'il présente une teneur élevée en isocyanate et une viscosité individualisée, en dépit d'une teneur réduite en polyisocyanate monomère.

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