Process for producing a foamed polymer endowed with high resista

Details Process for producing a foamed polymer endowed with high resista Process for producing a foamed polymer endowed with high resista

1991-12-19

1993-06-01

Kuhns, Allan R.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521157, 264 54, 264234, C08G 1800, B29C 6722

Patent

active

052160394

ABSTRACT:
A process for producing a foamed polymer comprises the steps of: mixing, in a dissolver, a mixture constituted by at least one isocyanate and a first unsaturated anhydride, which is charged to the dissolver in the liquid state and at a relatively high temperature; progressively cooling said mixture, with continued stirring, until a temperature not higher than 22.degree. C. is reached; adding to the mixture, with the latter being still kept with continuous stirring, a second unsaturated anhydride, at least one foaming agent, a vinylidene compound, poly(vinyl chloride) and a heat stabilizer; maintaining the mixture with continuous stirring, at said temperature, until a paste is obtained which is poured, after being preliminarily filtered, into a mould or container; curing said paste by charging the container to an oven at atmospheric pressure, and at a temperature not higher than 80.degree. C.; completing the curing of the paste-like mixture under pressure, by increasing temperature up to 180.degree. C. and subsequent cooling, until partially foamed germs are obtained; and completing the germ foaming process, by heating.

REFERENCES:
patent: 2576749 (1951-11-01), Carpentier
patent: 3200089 (1965-08-01), Landler et al.
patent: 3256217 (1966-06-01), Landler et al.
patent: 3267051 (1966-08-01), Landler et al.
patent: 3277028 (1966-10-01), Parker et al.
patent: 4328136 (1982-05-01), Blount
patent: 4377644 (1983-03-01), Kopp et al.
patent: 4430454 (1984-02-01), Castrantas et al.

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