Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1980-10-20
1982-01-12
Levin, Stanford M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
252429C, 252431R, 5263482, 5263483, 5263485, 5263486, 526352, C08F 476, C08F 1002
Patent
active
043106480
ABSTRACT:
Olefins are polymerized in the presence of a catalyst prepared by reacting trivalent or tetravalent titanium compounds such as a titanium trichloride or a titanium tetraalkoxide, zirconium compounds such as tri-n-butoxy zirconium chloride, an organomagnesium component such as di-n-hexyl magnesium, a halogen source such as ethyl aluminum dichloride and an organoaluminum compound if the halide source or magnesium component does not contain sufficient quantities of aluminum. Polymerization processes employing these catalyst compositions do not require conventional catalyst removal steps in order to provide polymers having suitable color and other physical characteristics and these catalysts produce polymers having broader molecular weight distributions and, at higher zirconium amounts, lower melt indices than do corresponding catalysts without the zirconium compound.
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Lowery, Jr. Kirby
Shipley Randall S.
Carter J. G.
Levin Stanford M.
The Dow Chemical Company
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