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

1986-06-10

Foelak, Morton

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

264321, 264DIG5, 264DIG66, 521 60, 521 79, 521 81, 521139, 521180, 521189, 521918, B29H 720, B29D 2700

Patent

active

045942080

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), Gaglioni et al.
patent: 4360486 (1982-11-01), DiBiasi et al.
patent: 4361453 (1982-11-01), Gaglioni et al.
patent: 4367296 (1983-01-01), Gaglioni et al.

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