Polystyrene foam and a process for making the same

Details Polystyrene foam and a process for making the same Polystyrene foam and a process for making the same

1992-04-24

1994-08-23

Kight, III, John

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 97, 521 98, 521130, 521146, 521908, C08J 900

Patent

active

053408446

ABSTRACT:
An improved polystyrene foam having less corrugation is disclosed which uses carbon dioxide as the blowing agent and 1-30 weight percent endothermic agent, such as water, with the weight based on the total carbon dioxide blowing agent and endothermic agent weight. This combination of carbon dioxide and endothermic agent decreases the corrugation of the thermoplastic foam, while just slightly increasing density, when the process parameters, including throughput, are equivalent to using only carbon dioxide. The process an also allow an increased foaming temperature and greater process throughput of an equivalent density thermoplastic foam at approximately equivalent corrugation levels when compared to the use of only using only carbon dioxide.

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C. M. Krutchen, Ext PS Sht, Documentation of U.S. EPA Data, pp. 3.4-C10-3.4-C11, Oct. 9, 1987.
U.S. Ser. No. 07/388,468 filed Aug. 2, 1989 (Welsh).

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