Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1985-05-08
1986-10-28
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
524724, 524765, 524789, 528 48, 528 60, 528 62, 528 64, 528 69, 528 71, 528 73, 528902, C08G 1830
Patent
active
046199853
ABSTRACT:
The present invention is directed to a process for the production of suspensions of finely-divided polyisocyanates which are obtainable by the surface reaction with from 0.1 to 25 equivalent percent of reactive group per NCO of stabilizers in relatively high molecular weight polyols and/or relatively high molecular weight polyamines having molecular weights from 400 to 6,000 optionally with addition of lower molecular weight polyols and/or aromatic amines having molecular weights of from 60 to 399, which are characterized in that unreacted quantities of stabilizers in the suspension are subsequently partially or completely deactivated by addition of substances having an acylating and/or neutralizing and/or alkylating effect and/or adsorbing effect as "deactivators". In particular, mono- and/or polyisocyanates are used as "deactivators". Deactivated suspensions obtainable in this way do not exhibit rising thickening temperatures during the production of polyurethanes, in particular in large-volume shaped articles.
The present invention also relates to deactivated suspensions obtainable by the present process and to the use thereof for polyurethane production.
REFERENCES:
patent: 4278578 (1981-07-01), Carpenter
patent: 4400497 (1983-08-01), Blum et al.
patent: 4483974 (1984-11-01), Grogler et al.
patent: 4507413 (1985-03-01), Thoma
patent: 4525570 (1985-06-01), Blum et al.
Barnes James M.
Grogler Gerhard
Hess Heinrich
Kopp Richard
Bayer Aktiengesellschaft
Gil Joseph C.
Harsh Gene
Welsh Maurice J.
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