Patent ID: 7772307
Filing Date: 2010-08-10
Classification: C08G,C09J

Abstract:
1. A water dispersible polyisocyanate composition having (a) an aliphatic polyisocyanate or a mixture of aliphatic polyisocyanates bearing primary and/or secondary isocyanate groups, and containing isocyanurate groups, and/or biuret groups, and/or oxadizine-1,3-dione-5-imine groups, and/or uretdione groups; and (b) a reaction product of component (a) with a mixture of a polyoxyalkylene amine and a polyoxyalkylene alcohol containing 65-87% of ethylene oxide units, based on a number-averaged molecular weight of the mixture of the polyoxyalkyene amine and polyoxyalkylene alcohol; wherein the composition is prepared by the steps of (1) forming an intermediate composition comprising urea functional groups by mixing 97-94% of component (a), based on the weight of the compositions, with 2-3% of a component (c) consisting of polyoxyalkylene amine with an NH and 1-3% of a component (d) consisting of polyoxyalkylene alcohol with an OH equivalent weight of 300-500 gram per equivalent number, selected from the group consisting of (2) continuous heating of the intermediate composition under conditions and for a time to convert sufficient of the urea functional groups to biuret functional groups so as to from the water dispersible polyisocyanate with a viscosity that is less than 132% of the viscosity of the intermediate composition.