Extruded foams having a monovinyl aromatic polymer with a broad

Details Extruded foams having a monovinyl aromatic polymer with a broad Extruded foams having a monovinyl aromatic polymer with a broad

1996-06-21

1997-07-22

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264 50, 521 79, 521 81, 521 98, 521146, C08J 914

Patent

active

056501064

ABSTRACT:
Disclosed is an extruded, linear, bimodal monovinyl aromatic polymer foam having a weight average molecular weight of from about 100,000 to about 200,000, greater than 5 percent by weight of its polymer chains having a weight average molecular weight of 500,000 to 1,000,000, and less than 5 percent by weight of its polymer chains having a weight average molecular weight of greater than 1,000,000. Use of the polymer enables process pressure drop to be significantly reduced and allows the formation of a foam of lower density and larger cross-section. Further disclosed is a process for making the extruded foam.

REFERENCES:
patent: 4663357 (1987-05-01), Meyer et al.
patent: 4673694 (1987-06-01), Meyer et al.

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