Process for the preparation of polyurethane-polyisocyanurate foa

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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521164, 521902, 502167, C08G 1818

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active

044529210

ABSTRACT:
The invention describes a process for harmonizing the reaction rates for the formation of urethane and isocyanurate groups during the preparation of polyurethane-polyisocyanurate foams by reacting organic polyisocyanates with polyols in the presence of blowing agents and salts of amines having the formula ##STR1## as catalysts, wherein R stands for an hydrogen atom or a straight chained or branched alkyl radical with 1 to 19 carbon atoms, and n and m are equal or different whole numbers from 2 to 10.

REFERENCES:
patent: 4026840 (1977-05-01), Bechara et al.
patent: 4040992 (1977-08-01), Bechara et al.
patent: 4067830 (1978-01-01), Kresta
patent: 4070345 (1978-01-01), Winkelmann et al.

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