Anionically modified polyurethane ureas having reduced...

C - Chemistry – Metallurgy – 08 – L

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C08L 75/00 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/66 (2006.01) C14C 11/00 (2006.01)

Patent

CA 2101389

ANIONICALLY MODIFIED POLYURETHANE UREAS HAVING REDUCED TACKINESS FOR THE COATING OF LEATHER ABSTRACT OF THE DISCLOSURE This invention relates to anionically modified polyurethane ureas having a low urethane group content and a low urea group content that are prepared by the reaction of (A) aromatic diisocyanates, (B) polyether polyols having an average molecular weight greater than 1500, (C) at least one compound containing 1 to 2 isocyanate-reactive groups and at least one ionic group, (D) polyamines having an average molecular weight of at least 32, and (E) water, the average total functionality of the isocyanate-reactive compounds B to D being greater than 1.85, wherein the polyurethane ureas have from 800 to 1500 mmol urethane groups and from 800 to 1800 mmol urethane plus urea groups per kg of anionically modified polyurethane urea. This invention further relates to the use of such anionically modified polyurethane ureas as adhesion promoters for leather.

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