High temperature process for the production of atactic,...

Details High temperature process for the production of atactic,... High temperature process for the production of atactic,...

2006-02-14

2006-02-14

Choi, Ling-Sui (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S124300, C526S124200, C526S124100, C526S160000, C526S943000

Reexamination Certificate

active

06998457

ABSTRACT:
Atactic or amorphous poly-alpha-olefins containing 100%–65% propylene and optionally up to about 35% ethylene and/or up to about 15% of a C4–C8alpha-olefin are prepared by polymerizing the monomer(s) at 180–450° F. and at a pressure sufficient to substantially maintain the monomer(s) in the liquid phase. The polymerization is carried out in the presence of catalyst system consisting of (a) a transition metal halide selected from the group consisting of (i) a titanium trihalide and an aluminum alkyl, (ii) a titanium halide on a comminuted magnesium halide support, and (iii) a titanium halide sandwich compound and (b) aluminum alkyl as a co-catalyst. No stereoregulator or only minor amounts of a stereoregulator are used.

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patent: 4736002 (1988-04-01), Allen et al.
patent: 6586536 (2003-07-01), Kelley
patent: 0 360 094 (1990-03-01), None

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