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

1990-11-26

1992-05-05

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 264DIG7, 264DIG9, 264DIG10, 264DIG15, 521 56, 521 60, 521142, 521146, 521149, C08V 922, C08V 9232, C08V 924

Patent

active

051108364

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 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 agent currently being used in commerically viable processes for making expanded polystyrene products. The process can be used with or without a molding step.

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patent: 4585605 (1986-04-01), Kadota et al.
patent: 4777000 (1988-10-01), Kuwabara et al.
patent: 4925606 (1990-05-01), Francis

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