Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1993-07-06
1995-05-30
Hoke, Veronica P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524373, 524410, 524411, 524413, 524423, C08K 5527
Patent
active
054201837
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.
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Arena Arthur A.
Sawhney Parvin
Hoke Veronica P.
HPG International, Inc.
Roberts Richard S.
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