Polymer foam, thermoformed shapes thereof and methods of forming

Details Polymer foam, thermoformed shapes thereof and methods of forming Polymer foam, thermoformed shapes thereof and methods of forming

1984-06-18

1986-05-06

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, 264321, 264DIG5, 264DIG66, 521 79, 521 81, 521139, 521180, 521189, 521918, C08J 918

Patent

active

045872716

ABSTRACT:
A foam structure having a density of less than about 20 lbs/ft.sup.3. The method of forming the same comprising forming a homogeneous melt blend under pressure of a polymer member selected from the group consisting of polyetherimide resin particles, polycarbonate resin particles, a polymer blend of polyphenylene oxide and polystyrene in particle form imbibed with a blowing agent, followed by extrusion of the same into a lower pressure atmosphere. A composition comprising said particles imbibed with methylene chloride, chloroform, 1,1,2-trichloroethane or mixtures thereof. A method of thermoforming said foam in sheet form.

REFERENCES:
patent: 3277029 (1966-10-01), Chadwick et al.
patent: 3962154 (1976-06-01), Elgi
patent: 4315076 (1982-02-01), Gagliani et al.
patent: 4360486 (1982-11-01), Di Biasi et al.
patent: 4361453 (1982-11-01), Gagliani et al.
patent: 4367296 (1983-01-01), Gagliani et al.

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