Process for preparing smoke-retardant polyisocyanurate foam

Details Process for preparing smoke-retardant polyisocyanurate foam Process for preparing smoke-retardant polyisocyanurate foam

1976-03-10

1985-04-30

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521902, C08G 1814

Patent

active

045145253

ABSTRACT:
In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, the improvement comprising conducting the reaction by adding 0.5 to 6 wt. % as Si to the total components of the foam of an organosilicone surfactant having a Si content of 4-22%, and selected from an organopolysiloxane-poly-oxyalkylene copolymer, polyvinylsilane having polyoxyalkylene side chain or modified products thereof wherein the mole % of the ethylene oxide units of the polyoxyalkylene moiety of the organosilicone surfactant is greater than 40 mole % based on the total number of ethylene oxide and propylene oxide units in said polyoxyalkylene moiety.

REFERENCES:
patent: 2834748 (1958-05-01), Bailey et al.
patent: 2917480 (1959-12-01), Bailey et al.
patent: 3634345 (1972-01-01), Diehr et al.
patent: 3799896 (1974-03-01), Moss
patent: 3872035 (1975-03-01), Papa et al.
patent: 3940517 (1976-02-01), DeLeon
patent: 3981828 (1976-09-01), Demou et al.
patent: 3981829 (1976-09-01), Cenker et al.

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