Method of dimensionally stabilizing polystyrene patterns and the

Details Method of dimensionally stabilizing polystyrene patterns and the Method of dimensionally stabilizing polystyrene patterns and the

1986-11-04

1989-03-28

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264101, 264DIG9, 264DIG15, 425 4R, C08J 922, B29C 6704

Patent

active

048161993

ABSTRACT:
A method is disclosed of making dimensionally stable, expanded polystyrene foam patterns comprising: (a) expanding a supply of beads comprised of polystyrene and a thermally responsive expanding agent, the expansion being accomplished in one or more stages by use of a gaseous heating agent (steam) to define a fused pattern body of the expanded beads, and (b) subjecting the fused pattern body to subatmospheric pressure (in the range of 5-20" of Hg) for a period of about 0.5-6 hours but no more than sufficient to accelerate and complete the migration of the trapped expanding agent out of the pattern body. The expanding agent can be selected from the group consisting of various forms of pentane or butane.

REFERENCES:
patent: 3015851 (1962-01-01), Wiles
patent: 3086248 (1963-04-01), Culp
patent: 3278658 (1966-10-01), Immel
patent: 3452124 (1969-06-01), Knapp
patent: 3822331 (1974-07-01), Cogliano
Immel, R. H. "Expandable Polystyrene and its Processing into Patterns for the Evaporative Casting Process", In American Foundrymen's Society Transactions, vol. 87, 1979, pp. 545-550.
The Condensed Chemical Dictionary, Tenth Edition, revised by Gessner G. Hawley, New York, Van Nostrand Reinhold, c1981, pp. 156, 157, 784.

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