Time-efficient process for making expanded polymeric products wi

Details Time-efficient process for making expanded polymeric products wi Time-efficient process for making expanded polymeric products wi

1991-10-15

1992-05-19

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

051146401

ABSTRACT:
A method for making low density (0.8-1.1 lb./cu.ft.) expanded polymeric products uses blowing agent in an amount of any from 2 to 4.4 weight percent and aging periods of from 1 to 80 hours after each expansion step. The process uses 2 to 5 expansion steps and 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 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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