Method for reducing the melt flow rate of flame retardant expand

Details Method for reducing the melt flow rate of flame retardant expand Method for reducing the melt flow rate of flame retardant expand

1993-05-27

1994-04-12

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 405, 521 47, 521 88, 521 92, 521 97, 521 98, 521907, C08J 936, C08J 940

Patent

active

053026250

ABSTRACT:
A method for lowering the melt flow rate of flame retardant expanded polystyrene is provided. The method comprises treating the flame retardant expanded polystyrene with an aqueous solution of sodium bicarbonate. In another aspect of the present invention a method for pelletizing recycled flame retardant expanded polystyrene is provided. The method comprises treating ground flame retardant polystyrene in an aqueous solution of sodium bicarbonate; condensing the treated polystyrene; extruding the polystyrene; and pelletizing the polystyrene. In another aspect of the present invention the electrostatic build-up on polystyrene is reduced by contacting the polystyrene with an aqueous solution of sodium bicarbonate.

REFERENCES:
patent: 3058926 (1962-10-01), Eichhorn
patent: 3058927 (1962-10-01), McMaster et al.
patent: 3058928 (1962-10-01), Eichhorn et al.
patent: 3058929 (1962-10-01), Vanderhoff et al.

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