New polyurethanes and their use for the thickening of...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/48 (2006.01) C08G 18/08 (2006.01) C08G 18/71 (2006.01) C08G 18/72 (2006.01) C09D 175/08 (2006.01) C09J 175/08 (2006.01)

Patent

CA 2375440

The invention relates to water-soluble or water-dispersible polyurethane comprising a reaction product of A) a mixture of at least one polyether polyol al) having an average functionality of >= 3 and at least one urethane group-containing polyether polyol a2) having an average functionality of >= 4, B) at least one monoisocyanate having 8 to 22 carbon atoms, C) at least one (cyclo)aliphatic and/or aromatic diisocyanate, D) optionally at least one monoalcohol having 8 to 22 carbon atoms, and G) optionally at least one polyisocyanate having an average functionality of > 2 wherein the starting NCO/OH equivalent ratio is between 0.5:1 to 1.2:1 and which are suitable as thickening agents for aqueous systems, having a particularly efficient thickening action, a process for their production and aqueous systems containing them.

L'invention concerne un polyuréthanne soluble dans l'eau ou dispersible dans l'eau comprenant un produit de réaction : A) un mélange d'au moins un polyéther polyol Al) ayant une fonctionnalité moyenne de gtoreq. 3 et au moins un groupe uréthanne contenant du polyéther polyol a2) ayant une fonctionnalité moyenne de gtoreq. 4, B) au moins un monoisocyanate ayant 8 à 22 atomes de carbone, C) au moins un (cyclo) aliphatique et/ou diisocyanate aromatique, D) en option, au moins un monoalcool ayant 8 à 22 atomes de carbone, et G) en option, au moins un polyisocyanate ayant une fonctionnalité moyenne de > 2, dans lequel le rapport équivalent de départ en NCO/OH est entre 0,5:1 à 1,2:1 et qui sont appropriés comme agents épaississants pour des systèmes aqueux, ayant une action épaississante particulièrement efficace, un processus pour leur production et les systèmes aqueux qui les contiennent.

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