A liquid urethane-containing polyisocyanate mixture which...

Details A liquid urethane-containing polyisocyanate mixture which... A liquid urethane-containing polyisocyanate mixture which...

C - Chemistry, Metallurgy

08

G

C08G 18/68 (2006.01) B32B 5/20 (2006.01)

Patent

CA 2056951

A composite element which comprises A) at least one top layar of polyvinyl chloride or a polyvinyl chloride-containing polymer mixture, and B) a preferably semirigid or rigid polyurethane foam, the top layer (A) or the polyurethane foam (B) or the two constituents (A) and (B) containing units of an .alpha.,.beta.-olefinically unsaturated polyester having a molecular waight factor per double bond of from 150 to 3000, a process for the production of composite element3 of this type, and liquid, urethane-containing polyisocyanate mixtures based on diphenylmethane diisocyanates and higher homologs thereof and .alpha.,.beta.-olefinically unsaturated polyester for the preparation of the polyurethane foam (B) are dsscribed.

.Z. 0050/42048 Résumé de la divulgation : On décrit un élément composite comportant A) au moins une couche supérieure de chlorure de polyvinyle ou d'un mélange polymérique contenant du chlorure de polyvinyle et B) une mousse de polyuréthane semi-rigide ou rigide de préférence, la couche supérieure A) ou la mousse de polyuréthane B) ou les deux constituants A) et B) contenant des unités d'un polyester oléfinique insaturé en alpha, bêta, dont le facteur de poids moléculaire par liaison double est compris entre 150 et 3 000, et un procédé pour la production d'éléments composites de ce type et de mélanges liquides de polyisocyanate contenant de l'uréthane, à base de diisocyanates de diphénylméthane et de composés homologues de ce type à chaîne longue et de polyester oléfinique insaturé en alpha, bêta, servant à la préparation de la mousse de polyuréthane B).

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