Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1980-08-11
1981-08-18
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 53, 525243, C08F29708
Patent
active
042847389
ABSTRACT:
A process for the preparation of ethylene-propylene block copolymers at high catalyst productivity rates resulting in polymer products having improved impact strength-polymerized ethylene content relationship. The improvement is obtained by reacting preformed propylene prepolymer still containing active catalyst residues with ethylene and propylene in a vapor phase reaction zone in the presence of additional aluminum trialkyl catalyst component introduced to the reaction zone. The polymer produced by the process exhibits excellent physical and mechanical properties.
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El Paso Polyolefins Company
LeMaire Margareta
Levin Stanford M.
Valles Fred S.
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