Process for foaming flame retardant polystyrene and polystyrene

Details Process for foaming flame retardant polystyrene and polystyrene Process for foaming flame retardant polystyrene and polystyrene

1995-06-06

1996-01-16

Foelak, Morton

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

4283148, 521 79, 521 98, 521146, B32B 326

Patent

active

054846498

ABSTRACT:
Polystyrene melts treated with flameproofing agents and nucleating agents are foamed by addition of alkanes, such as propane, butane or propane/butane mixtures, as blowing agents, such that the flame retardant properties of the polystyrene foams are achieved after a very short storage time, or at the latest after storage for three weeks at room temperature. Even after a storage time of one week, sufficient blowing agent is still present in the closed-cell pores of the polystyrene foams to be able to undertake adequate post-expansion of the foams with a foaming factor of 1.8 to 2.0.

REFERENCES:
patent: 3669923 (1972-06-01), Hintz
patent: 4298702 (1981-11-01), Hahn et al.
patent: 5112875 (1992-05-01), Zimmerman et al.
patent: 5149721 (1992-09-01), Ishikawa et al.
Database WPI, "Thermoplastic Resin Foam", Derwent Publications Ltd., London, GB; & JP-A-58 211 426 Sekisui Plastics, Dec. 1993.
Database WPI, "Blending Styrene Resin with Foamer and Flame Retardant Mixture", Derwent Publications Ltd., London, GB; & JP-A-57 038 832 Sekisui Plastics, Mar. 1992.
Database WPI, "Dimensionnally Stable Styrene Resin Foam Production", Derwent Publications Ltd., London, GB; & JP-A-55 110 131 Sekisui Plastics, Aug. 1980.

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