C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 23/12 (2006.01) C08K 3/22 (2006.01) C08K 3/30 (2006.01) C08K 5/06 (2006.01) C08K 5/527 (2006.01) C08K 13/02 (2006.01)
Patent
CA 2127410
Abstract The invention provides a substantially uniformly blended, flame retardant polypropylene composition and an extruded polypropylene sheet which comprises a polypropylene polymer, the bis(2,3 dibromopropylether) of tetrabromobisphenol A, antimony trioxide, titanium dioxide, calcium sulfate and distearyl pentaerythritol diphosphite. The invention further provides a method for producing such a polypropylene sheet material by forming a substantially uniform physical blend of the above components; drying the blend; heating the blend at a temperature above its melting point to form a melt of the blend components while mixing the melt; and extruding the blend through a sheet forming die and highly polished rollers.
Arena Arthur A.
Sawhney Parvin
Hpg International Inc.
Smart & Biggar
LandOfFree
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