Propylene random copolymers and processes for preparing same

Details Propylene random copolymers and processes for preparing same Propylene random copolymers and processes for preparing same

1992-06-22

1994-08-09

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526160, 526348, 5263482, 5263483, 526916, C08F21006, C08F 4642

Patent

active

053367464

ABSTRACT:
A random copolymer of propylene with from 1 to 10 mol % of a C.sub.4 to C.sub.20 .alpha.-olefin and an intrinsic viscosity of 0.5 to 6 dl/g is also characterized by a melting point (Tm) measured by a differential scanning calorimeter falling within the range of 90<Tm<155-3.5(100-P) (wherein P is the propylene content (mol %) present in the copolymer), a molecular weight distribution (Mw/Mn) of less than 3.5, and a boiling trichloroethylene-insoluble content of less than 5% by weight. Terpolymers of propylene-ethylene-C.sub.4 -C.sub.20 .alpha.-olefin wherein Tm falls within the range of 70<Tm<155 -5.5(100-P) are also described. The propylene random copolymer is prepared by polymerizing propylene, .alpha.-olefin, and optionally, ethylene in the presence of a catalyst system which includes an hafnium compound having a multidentate ligand and two or more cycloalkadienyl groups linked together via an alkylene linkage, and an organoaluminum oxy-compound.

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