Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1994-01-14
1994-10-18
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 79, 521 97, 521148, C08J 908, C08J 912
Patent
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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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." *
Blythe James E.
Colombo Edward A.
Krutchen Charles M.
Williams Phillip A.
Wu Wen-Pao
Foelak Morton
Keen Malcolm D.
McKillop A. J.
Mobil Oil Corporation
Wise L. Gene
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