Patent ID: 6632914
Filing Date: 2003-10-14
Classification: C08G

Abstract:
A process for the preparation of polyfunctional polyisocyanate polyadducts, comprising(i) preparation of an adduct (A) by reacting (a) an at least trifunctional component (a1) reactive with isocyanate groups or a difunctional component (a2) reactive with isocyanate groups or a mixture of the components (a1) and (a2) with (b) a di- or polyisocyanate component, the reaction ratio being chosen so that on average the adduct (A) contains one isocyanate group and more than one group reactive with isocyanate groups, (ii) optionally, intermolecular addition reaction of the adduct (A) to give a polyadduct (P) which contains on average one isocyanate group and more than two groups reactive with isocyanate groups, and (iii) reaction of the adduct (A) or of the polyadduct (P) with an at least difunctional component (c) reactive with isocyanate groups.