PROCESS FOR PRODUCING POLYADDITIONAL AND HYBRID ARTIFICIAL RESINS POLYISOCYANATE /POLYSILICA USING BLOCKED POLYISOCYANATES AND THE BLOCKED POLYISOCYANATES USABLE IN THE PROCESS

摘要

The invention relates to a process for preparing polyisocyanate/polysilicic acid based resins wherein one or more polyisocyanates is/are reacted with water glass optionally in the presence of one or more additives and/or auxiliary agents conventionally used in the preparation of polyisocyanate/polysilicic acid based resins. According to the invention at least 5 % by weight of the polyisocyanate is replaced by a polyisocyanate in which at least 30 % of the isocyanate groups are blocked, and at least 50 % of the blocked isocyanate groups are blocked with (a) a compound comprising structural units with two mobile hydrogens of acidic character and derivatives thereof in which one of the mobile hydrogens is replaced by a substituent X, wherein X represents halo, hydrocarbyl, hydrocarbyl-oxy, hydrocarbyl-carbonyl or hydrocarbyl-oxy-carbonyl group or a combined group formed from two or more of these groups, (b) an unsaturated oxime of formula (I) wherein R