Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1991-10-15
1992-05-05
Foelak, Morton
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264DIG7, 264DIG9, 264DIG10, 264DIG15, 521 56, 521 58, 521 60, 521142, 521146, 521149, C08J 922, C08J 9232, C08J 924
Patent
active
051105241
ABSTRACT:
A method for making low density (0.8-1.1 lb/cu. ft.) expanded polymeric products uses blowing agent in an amount of only from 2 to 4.4 weight percent. The process uses 2 to 5 expansion steps together with a polymer having a particular polydispersity, weight average molecular weight and M.sub.z :M.sub.n, this polymer having a greater expandability than conventional polymers. The process requires only about half of the amount of blowing agent currently being used in commercially viable processes for making expanded polystyrene products. The process can be used with or without a molding step.
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Harclerode William H.
Knutsen John C.
Pekich Barry J.
Volz William E.
Voss John C.
BASF Corporation
Carmen Dennis V.
Foelak Morton
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