Amorphous high molecular weight copolymers of ethylene and alpha

Details Amorphous high molecular weight copolymers of ethylene and alpha Amorphous high molecular weight copolymers of ethylene and alpha

1987-04-14

1989-01-10

Smith, Edward J.

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

523175, 526348, 5263482, 5263483, 5263484, 5263485, C08F21016

Patent

active

047974613

ABSTRACT:
The invention relates to amorphous copolymers of ethylene and one or more alpha-olefins comprising from 3 to 12 carbon atoms, possessing a high molecular weight, a crystallinity index less than or equal to 1.0%, a content of units derived from ethylene comprised between 40 and 60 moles %, a content of units derived from propylene and/or 1-butene between 60 and 40 moles % and a content of units derived from alpha-olefins comprising 5 to 12 carbon atoms of less than or equal to 10 moles %. These copolymers of a practically completely amorphous character advantageously occur in the form of a powder which is easy to handle. They are obtained by copolymerization in the gas phase by means of a catalyst system of the Ziegler-Natta type, very stereospecific to the polymerization of propylene.

REFERENCES:
patent: 3351079 (1967-11-01), Gibson
patent: 4677172 (1987-06-01), Zimmerman et al.
patent: 4736002 (1988-04-01), Allen et al.
Raff et al., Crystalline Olefin Polymer, Part I, Interscience Publ., N.Y., vol. XX, (1965) pp. 375-377.

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