Process for the production of rapid-set moldings

Details Process for the production of rapid-set moldings Process for the production of rapid-set moldings

1978-03-08

1980-01-08

Cockeram, H. S.

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...

528 44, 528903, 264 54, C08G 1822, C08G 1808

Patent

active

041828267

ABSTRACT:
The present invention relates to a process for the production of moldings based on organic polyisocyanates which have short in-mold times. The polyisocyanates are subjected to a polymerization reaction in closed molds in the presence of trimerization catalysts. The process is preferably carried out in the presence of compounds containing isocyanate-reactive groups where the equivalent ratio between NCO and NCO-reactive groups is greater than 1:0.8. The process has to be carried out in the absence of blowing agents, in order to produce nonfoamed moldings.

REFERENCES:
patent: 1574658 (1926-02-01), Johnston
patent: 2729618 (1956-01-01), Muller et al.
patent: 3294753 (1966-12-01), Beitchman et al.
patent: 3437722 (1969-04-01), Cronin et al.
patent: 3645975 (1972-02-01), Bernstein
patent: 3681291 (1972-08-01), Khan
patent: 3697485 (1972-10-01), Rambosek et al.
patent: 3711444 (1973-01-01), Allen et al.
patent: 3842036 (1974-10-01), Chow et al.
patent: 4126741 (1978-11-01), Carleton et al.
Bikales, Molding of Plastics (Encyclopedia Reprints), Wiley-Interscience (N.Y.) 1971, pp. 19, 20, 38, 39, 188, 192-194, 202 and 206.
Saunders et al.--Polyurethanes, Part I, Interscience (N.Y.) 1962, pp. 94-97 and 212.

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