Catalyst system useful for the preparation of polyisocyanate/polyaddition products comprises catalysts encapsulated in wax

摘要

New catalyst system encapsulated in wax comprises at least one catalyst (c) which catalyzes the reaction of polyisocyanates (a) with compounds (b) having at least two hydrogen atoms reactive to isocyanate groups. Independent claims are included for: (1) Preparation of the catalyst system by taking up the catalysts (c) in molten wax and dispersing them in a polar liquid; (2) preparation of polyisocyanate/polyaddition products by reaction of (a) polyisocyanates with (b) high molecular compounds with at least two hydrogen atoms reactive to isocyanate groups, in the presence of (c) catalysts, and optionally (d) propellants, (e) chain extenders, and (f) adjuvants or additives, in which part or the whole of catalysts (c) is encapsulated in wax.