Process for extruding stabilized expanded polystyrene compositio

Details Process for extruding stabilized expanded polystyrene compositio Process for extruding stabilized expanded polystyrene compositio

1977-03-23

1979-01-23

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

260 336PQ, 260 457PH, 260 4595R, 264 37, 264211, 264DIG69, 521 88, 521146, B29D 2700

Patent

active

041361423

ABSTRACT:
Crystal polystyrene is satisfactorily protected against oxidative degradation in foam extrusion processes and thermoforming of articles from the expanded product so formed, by incorporation therein of a combined stabilizer system, comprising from about 0.01 to about 0.5 parts by weight of a hindered phenol compound such as 1,1,3-tris(2-methyl-4-hydroxy-5-tert.butyl phenyl) butane, and from about 0.02 to about 1.0 parts by weight of a tris (substituted phenyl) phosphite such as tris (mixed mono- and dinonylphenyl phosphite), based upon 100 parts by weight of polystyrene. Such stabilized foamed crystal polystyrene may be used for the production of formed articles.

REFERENCES:
patent: 3151192 (1964-09-01), Jacobs et al.
patent: 3160688 (1964-12-01), Aykanian et al.
patent: 3239484 (1966-03-01), Stark
patent: 3287477 (1966-11-01), Vesilind
patent: 3294736 (1966-12-01), Jacob
patent: 3344215 (1967-09-01), De Witz et al.
patent: 3509091 (1970-04-01), Cleveland et al.
patent: 3530091 (1970-09-01), Kitaoka et al.
patent: 3637587 (1972-01-01), Cyba
patent: 3856728 (1974-12-01), Abramoff
patent: 3856747 (1974-12-01), Dibiasi
Collins, F. H. "Controlled Density Polystyrene Foam Extrusion" in SPE Journal, Jul. 1960, pp. 705-709.

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