C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 25/04 (2006.01) C08K 3/06 (2006.01) C08K 5/49 (2006.01) C08K 13/02 (2006.01) C09K 21/00 (2006.01)
Patent
CA 2203306
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, (ii) is composed solely of carbon, hydrogen, and phosphorus, and optionally one or more of the elements nitrogen, oxygen, and sulfur, and (iii) has a phosphorus content of not less than 6 percent by weight; and (b) elemental sulfur, or a halogen-free organic polysulfide that has (i) a sulfur content of not less than 20 percent by weight and (ii) at least one polysulfide linkage composed of three or more sulfur atoms; in proportions such that the weight ratio of sulfur in b) to phosphorus in a) is below 15 :1 and in an amount such that the styrenic polymer can provide test specimens that exhibit an LOI of at least 24 if tested in accordance with ASTM Standard Test Method D 2863-87.
Kumar Govindarajulu
Nalepa Christopher J.
Prindle John C. Jr.
Albemarle Corporation
Macrae & Co.
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