| 摘要 |
Polyfunctional polyisocyanate polyadducts are prepared by a process comprising</PTEXT>(i) preparation of an adduct by reacting</PTEXT>(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</PTEXT>(b) a di- or polyisocyanate, the reaction ratio being chosen so that on average the polyadduct (A) contains one isocyanate group and more than one group reactive with isocyanate groups,</PTEXT>(ii) if required, 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</PTEXT>(iii) reaction of the adduct (A) or of the polyadduct (P) with an at least difunctional component (c) reactive with isocyanate groups.</PTEXT>
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