Method for preparing improved expanded polystyrene sheet

Details Method for preparing improved expanded polystyrene sheet Method for preparing improved expanded polystyrene sheet

1976-01-02

1977-09-13

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

260 25B, 260 25E, 260 4243, 264 53, 264211, 264DIG5, 264 459, 264DIG13, 264DIG17, B29D 2700

Patent

active

040482723

ABSTRACT:
Expanded styrene polymer sheet material is produced by extruding expandable and/or general purpose styrene polymer with a conventional blowing agent, a nucleating system and a small amount of finely divided hydrophobic silicon dioxide. The resulting product has very fine, uniformly sized pores and improved flexibility.

REFERENCES:
patent: 3661810 (1972-05-01), Gahmig
patent: 3696061 (1972-10-01), Selsor et al.
patent: 3912667 (1975-10-01), Spitzer et al.
patent: 3950484 (1976-04-01), Egli
"The Condensed Chemical Dictionary" Eighth Edition, revised by Gessner G. Hawley, New York, Van Nostrand Reinhold, c1971, pp. 148, 446, 783.
Cabot Corp. Bulletins, "Silanox 101 : A New Approach to the Control of Powder Materials", by Paul R. Tully, Boston, Mass., Cabot Corp., (1972) STD-201, pp. 1-4.

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