Process for preparing a foamed body having an annular ring patte

Details Process for preparing a foamed body having an annular ring patte Process for preparing a foamed body having an annular ring patte

1975-12-22

1977-09-13

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 25B, 260 25HB, 260 4243, 260 4248, 260 4256, 260874, 260887, 260892, 264 75, C08J 920

Patent

active

040481018

ABSTRACT:
A foamed body having an annular ring pattern in cross-section is prepared by blending a powdery or particulate styrene resin A and a powdery or particulate styrene resin B and molding the blend by extrusion or injection molding. The resin A particles have foaming components incorporated on the surfaces thereof, prior to blending same with resin B. The resin B has a lower fluidity than that of resin A by a difference of melt index of 1 to 20, it has a particle size larger than that of the resin A powder or particles, it is free of foaming component, it has a color different from that of powdery or particulate resin A, and it is compatible with resin A.

REFERENCES:
patent: 2744291 (1956-05-01), Stastny
patent: 3474048 (1969-10-01), Chappelear et al.
"Foaming Agents for Polyolefins", by Lasman, SPE Journal, Sept. 1962, pp. 1184-1193.

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