Process for producing polystyrene resin foam by extrusion

Details Process for producing polystyrene resin foam by extrusion Process for producing polystyrene resin foam by extrusion

2007-07-17

2007-07-17

Kuhns, Allan R. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

C264S053000, C521S079000, C521S139000

Reexamination Certificate

active

11107874

ABSTRACT:
A process for an extruded resin foam, comprising extruding a foamable composition comprising a melted polystyrene resin and a physical blowing agent through a die to obtain a polystyrene resin foam having a thickness of at least 10 mm and a transverse cross-sectional area of at least 50 cm2, wherein said extrusion is performed so that the ratio Mz/Mn of a Z average molecular weight Mz of the polystyrene resin foam to a number average molecular weight Mn of the polystyrene resin foam, each measured by gel permeation chromatography, is 8.0 or more.

REFERENCES:
patent: 2884386 (1959-04-01), Denslow et al.
patent: 5110836 (1992-05-01), Harclerode et al.
patent: 06-057028 (1994-03-01), None
patent: 2004-292664 (2003-10-01), None
patent: 2004-059595 (2004-02-01), None
patent: 2004-196907 (2004-07-01), None

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