Polymerization catalyst and method

Details Polymerization catalyst and method Polymerization catalyst and method

1975-06-30

1977-06-21

Holler, Alan

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526106, 252428, 252430, 252458, 252465, C08F 402, C08F 478, C08F 1000

Patent

active

040312984

ABSTRACT:
A catalyst system for the polymerization of at least one 1-olefin to produce a polymer of ultralow molecular weight (ULMW) and prepared by (1) forming a substantially dry intimate mixture of an alkyl ester of titanium containing about 1-7 carbon atoms in the alkyl group and a support of the class consisting of finely divided silica, alumina, zirconia, thoria and mixtures thereof, (2) calcining said ester-support mixture to and at a temperature between about 400.degree.-1000.degree. C., (3) adding to the resulting calcined mixture an organotin chromate essentially of the formula ##STR1## wherein each R is an individually selected hydrocarbon radical containing from 1-14 carbon atoms, and (4) activating the resulting coated calcined mixture by heating to and at a temperature between about 300.degree.-500.degree. C. in the presence of oxygen.
The disclosure also includes the method of making the catalyst system and the method of making polymers of ultralow molecular weight from polymerizable 1-olefins by polymerizing at least one 1-olefin under polymerizing conditions with the catalyst system disclosed herein.

REFERENCES:
patent: 3324101 (1967-06-01), Baker et al.
patent: 3625864 (1971-12-01), Horvath
patent: 3676417 (1972-07-01), Horvath
patent: 3704287 (1972-11-01), Johnson
patent: 3780011 (1973-12-01), Pullukat et al.
patent: 3876554 (1975-04-01), Pullukat
patent: 3879362 (1975-04-01), Chalfont et al.
patent: 3884832 (1975-05-01), Pullukat et al.
patent: 3887494 (1975-06-01), Dietz

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