High melt index polystytene foam and method

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

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521 79, 521 97, 521148, C08J 908, C08J 912

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active

053569440

ABSTRACT:
A polystyrene resin in foam form having a basis weight of less than about 20 g/100 in.sup.2 and a density of about 6 lbs./ft.sup.3 or less, the foam precursor of which is either a polystyrene having a melt index of about 8 or more or a polystyrene in combination with a minor proportion of any other material which will result in a melt index of about 8 or more. A method of forming such a polystyrene resin foam structure includes combining the resin in molten form under pressure with the blowing agent of at least approximately 100% carbon dioxide and extruding the mixture through a die into an atmosphere of reduced pressure to form the foam structure.

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patent: 4956395 (1990-09-01), Leduc
L. M. Zwolinski et al., "Extruded Polystyrene Foam with CFC/Carbon Dioxide Blowing Agents, ANTEC 1986", pp. 30-33.*
Encyclopedia of Polymer Science and Engineering (2nd ed., J. Wiley & Sons) 1989, vol. 16, pp. 62-71, "General Purpose Polystyrene." *

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