Flame retardant styrenic polymers

Details Flame retardant styrenic polymers Flame retardant styrenic polymers

1997-08-27

1998-09-22

Hoke, Veronica P.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521146, 524 80, 524116, 524129, 524131, 524134, 524137, 524139, 524141, 524145, 524146, 524147, 524154, C08K 55397, C08K 55317, C08K 5523, C08K 550, C08K 306

Patent

active

058114700

ABSTRACT:
Compositions and methods are described wherein a styrenic polymer is rendered flame retardant by incorporation therein before, during or after its formation, a combination of (a) at least one organic phosphorus additive that (i) is halogen-free, and (ii) is composed solely of carbon, hydrogen, and phosphorus, and optionally and preferably one or more of the elements nitrogen, oxygen, and sulfur; and (b) elemental sulfur; in proportions such that (i) the sulfur content from b) is less than 2 percent by weight of the weight of the styrenic polymer plus the weight of a) and b), and (ii) the styrenic polymer plus ingredients a) and b) can provide test specimens which exhibit an LOI of at least 24 if tested in accordance with ASTM Standard Test Method D 2863-87.

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