Foamed profile extrusion process

Details Foamed profile extrusion process Foamed profile extrusion process

1973-07-17

1976-01-06

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

260 25F, 264 461, 264 54, 264101, 264177R, 264DIG5, 264DIG14, 428315, B29D 2700, B29F 306

Patent

active

039313794

ABSTRACT:
A process for the manufacture of profiled products by extruding in a substantially non-expanded state an expandable styrene polymer composition through a die orifice having the desired profile and subsequently passing the extruded material through a sizing member wherein it expands to the desired profile and cross-section to produce an article having a porous inner cross-section and a solid, non-foamed outer layer and wherein the styrene polymer composition employed is one containing from about 0.2 to 1.0 parts by weight of an alkaline earth metal carbonate blowing agent and from about 0.2 to 1.0 parts by weight of an organic acid per 100 parts by weight of styrene polymer.

REFERENCES:
patent: 2941964 (1960-06-01), Houston et al.
patent: 2941965 (1960-06-01), Ingram
patent: 3344092 (1967-09-01), Pavuk
patent: 3431163 (1969-03-01), Gilbert
patent: 3431164 (1969-03-01), Gilbert
patent: 3461496 (1969-08-01), Winstead
patent: 3764642 (1973-10-01), Boutillier
"Hackh's Chemical Dictionary", Third Edition completely revised and edited by Julius Grant, New York, McGraw-Hill, c. 1944, pp. 11-14.

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