MIXTURES OBTAINED BY REACTING POLYOL AND ANHYDRIDE, AND USE THEREOF IN POLYISOCYANATES FOR PRODUCING POLYISOCYANURATES Russian patent published in 2014 - IPC C08G18/42 C08G18/48 C08G18/16 C09J175/06 

FIELD: chemistry.

SUBSTANCE: present invention relates to a reactive isocyanate mixture used as a polyol component when producing polyisocyanurates, comprising a trimerisation catalyst selected from alkali metal carboxylates, quaternary ammonium carboxylates, wherein the carboxylates contain 1-12 carbon atoms, and obtained by reacting phthalic anhydride and/or trimellitic anhydride with a polyol having an average equivalent weight of 100-2500 and an average nominal hydroxyl functionality of 2-8, in such amounts that the molar amount of the anhydride ranges from 0.1 to 99% of the hydroxyl equivalent amount of the polyol, wherein the ratio of the number of carboxylic acid groups to the number of ester groups, both formed in the reaction between the anhydride groups and the polyol, is 0.9-1.1 to 1 and wherein at least 60% of the anhydride groups have reacted. The invention also describes a polyisocyanate composition containing said mixture, a binder composition containing such a polyisocyanate composition, use of such compositions to produce polyisocyanurates and polyisocyanurates.

EFFECT: obtaining an reactive isocyanate mixture characterised by a certain degree of stability for a certain period of time, which enables to slow down the polyisocyanate trimerisation reaction in processes of producing polyisocyanurates where a long processing time is required in case of resin transfer moulding or pre-wetting of other materials like pultrusion, plastic sheet moulding etc.

12 cl, 1 tbl, 24 ex