Impregnating polystyrene beads with an expanding agent

Details Impregnating polystyrene beads with an expanding agent Impregnating polystyrene beads with an expanding agent

1985-05-02

1985-12-24

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521146, C08J 918

Patent

active

045607052

ABSTRACT:
A method of impregnating polystyrene beads with an aliphatic hydrocarbon, rendering it into expandable polystyrene. The method involves the use of an improved impregnating solution or bath. The solution includes water, an expanding agent, the polystyrene beads and soaps which act as anti-agglomeration agents. The beads are maintained in the solution for a selected time period and at a temperature and pressure suitable to permit the expanding agent to impregnate the beads. The beads are then separated from the solution and, after drying, they are ready for use, no further processing being required.

REFERENCES:
patent: 2911381 (1959-11-01), Roth
patent: 3051682 (1962-08-01), Ott
patent: 3827990 (1974-08-01), Wright
patent: 4226942 (1980-10-01), Wei
patent: 4312957 (1982-01-01), Spicuzza

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