Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1998-01-07
2000-05-02
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
5261253, 526351, 526901, 526905, 502152, 502158, 502103, C08F 238
Patent
active
060574070
ABSTRACT:
A process to produce high melt flow propylene polymer comprises polymerizing propylene in the presence of a titanium-containing, magnesium-containing, high activity catalyst and an aluminum alkyl cocatalyst in a gas phase system which uses condensed liquid to control temperature wherein the external catalyst modifier is a tetraalkylorthosilicate, preferably tetraethylorthosilicate, at process conditions of temperature, hydrogen concentration, and Si/Mg, Al/Mg and Al/Si atomic ratios, to produce a high melt flow propylene polymer at high yield.
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"Use of High Tacticity Catalysts To Produce Ultra High Melt-Flow Rate Polypropylene," Anonymous, Research Disclosure, Oct. 1993, pp. 35440.
Lin Chi-Hung
McGinn Dennis L.
Phalakornkul Kanokrot Ja
Streeky Jerome A.
Wilson, Jr. H. Dale
BP Amoco Corporation
Choi Lung-Siu
Oliver Wallace L.
Wu David W.
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