Patent ES-8603921-A1 (ES)
Title: Process for the preparation of deactivated suspensions of small polyisocyanate particles in higher molecular compounds, deactivated suspensions and their use in polyurethane preparation.
IPC: C08G18/08
Filed: 1985-05-17
Abstract: Suspensions, in polyols and/or polyamines, with aromatic amino gps., of mol. wt. 400-6000, of solid, stabilised polyisocyanates having retarded reactivity through encapsulating with a polymer by reaction of the polyisocyanate with 0.1-25 equiv. %, per NCO gp., of a di- or higher functional amino cpd. as ''amino-stabiliser'' (I), are deactivated by treating, at temp. below m. pt. of the polyisocyanate, with an acylating, alkylating, and/or neutralising and/or absorbing 'deactivator' (II). - (I) is at least one di- or higher functional cpd. with aliphatically-linked prim. and/or sec. amino gps. and/or -CONHNH2 terminal gps. and/or hydrazine and/or an alkylhydrazine and/or a guanidine and/or an amidine, of mol. wt. 32-6000. - Opt. the suspensions contain low mol. polyols and/or aromatic polyamines of mol. wt. 60-399 and nonpolar or slightly polar solvents. (0/0) EPAB- EP-162364 B A process for the production of suspensions of finely divided polyisocyanates, retarded in their reactivity by a surface coating, in polyols and/or polyamines containing aromatic amino groups by reacting (a) a solid finely divided polyisocyanate suspended in (b) one or more polyols and/or aromatic polyamines having molecular weights of 400 to 6,00o optionally polyols and/or aromatic polyamines having molecular weights of 60 to 399 and, optionally, plasticizers and solvents with (c) one or more compounds having a functionality of two or more and containing primary and/or secondary aliphatic amino groups and/or -CO-NH-NH-groups, hydrazine, alkyl hydrazines, guanidines and/or amidines having a molecular weight of 32 to 6,000 in a quantity of 0.1 to 25 equivalent-% per NCO groups of component (a), to form a surface coating around (a), characterized in that, after formation of the surface coating around (a), one or more compounds (d) having an acylating, alkylating or neutralizing effect on  component (c) are added to the suspension at temperatures below the melting temperature of component (a) in a quantity whichis at most substantially equivalent to component (c) still present in the suspension.  (16pp) USAB- US4619985 A Prodn. of deactivated suspension of solid polyisocyanates of retarded reactivity comprises (a) reacting one or more solid finely divided polyisocyanates having melting pt. above 30 deg.C with (ii) 0.1-25 eg. % of reactive gps. per isocyanate equiv. of a stabiliser cpd. having a mol. wt. of 32-600 selected from aliphatic polyamines, hydrazines, polyhydrazides, alkyl hydrazines, N,N'-dialkylhydrazines, amidine gp.-contg. cpds. guanidine gp.-contg. cpds. and their mixt. in the presence of an organic material of mol. wt. 400-600. - The organic material is (a) a cpd. contg. two or more hydroxyl gps., cpds. contg. two or more aromatically bound amine gps. and their mixt. Process further comprises adding a deactivator at a temp. below the melting temp. of the polyisocyanate which partially deactivates any unreacted quantities of the stabiliser.