Flame retardant polymer composition

Details Flame retardant polymer composition Flame retardant polymer composition

2006-12-05

2006-12-05

Szekely, Peter (Department: 1714)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C423S629000

Reexamination Certificate

active

07144941

ABSTRACT:
A flame retardant polymer composition consists ofa) 20–60 percent by weight of a thermoplastic and/or cross-linked or cross-linkable elastomer andb) as a flame retardant agent 40–80 percent by weight either of an aluminum hydroxide with the material valuesspecific surface according to BET 3–5 mg2/gmean grain size d501.0–1.5 μmresidual moisture 0.1–0.4%oil absorption 19–23%water absorption 0.4–0.6 ml/gor of an aluminum hydroxide with the material valuesspecific surface according to BET 5–8 m2/gmean grain size d500.8–1.3 μmresidual moisture 0.1–0.6%oil absorption 21–25%water absorption 0.6–0.8 ml/g.A process of producing the flame retardant agent is characterised in that a filter-moist aluminum hydroxide obtained by precipitation and filtration with a mean grain size of 0.8 to 1.5 μm is subjected to mill drying in a turbulent hot air stream in such a way that, while the grain distribution is largely retained, the BET surface is increased by at least 20%.

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