Process for making molded polymeric product with multipass expan

Details Process for making molded polymeric product with multipass expan Process for making molded polymeric product with multipass expan

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, C08J 922, C08J 9232, C08J 924

Patent

active

051108372

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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patent: 4419458 (1983-12-01), Rigler et al.
patent: 4485193 (1984-11-01), Rubens
patent: 4585605 (1986-04-01), Kadota et al.
patent: 4777000 (1988-10-01), Kuwabar et al.
patent: 4925606 (1990-05-01), Francis

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