Process for the polymerisation of olefins in the presence of an

Details Process for the polymerisation of olefins in the presence of an Process for the polymerisation of olefins in the presence of an

1995-06-02

1997-02-25

Pal, Asok

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

502171, 502227, 502242, C08F 424

Patent

active

056059892

ABSTRACT:
A process for the polymerization of at least one olefin in the presence of an activated catalyst, includes (a) providing an activated catalyst by a method including (1) mixing, in the absence of a solvent, at least one chromium salt with a support composition comprised of at least one compound (A) which is an inorganic, oxygen containing compound of at least one element selected from the group consisting of Group IVb, IIIa and IVa, and at least one compound (B) which is an inorganic compound containing at least one element selected from the group consisting of Group IVb and IIIa, the at least one compound (B) being different from the at least one compound (A), to provide a mixture; (2) preactivating the mixture by heating for a period ranging from 0.5 to 18 hours without calcining in an oxidizing atmosphere to a temperature ranging from at least 30.degree. C. above room temperature to a temperature which is lower than the decomposition temperature of the at least one chromium salt and which is 5.degree. C. below the melting temperature of the at least one chromium salt to obtain a catalyst precursor; and (3) activating the catalyst precursor by calcining in an oxidizing atmosphere and under conditions such that part of the chromium is converted to hexavalent chromium; and (b) polymerizing the at least one olefin in the presence of the activated catalyst under conditions effective therefor.

REFERENCES:
patent: 2825721 (1958-03-01), Hogan et al.
patent: 3622521 (1971-11-01), Hogen et al.
patent: 3953413 (1976-04-01), Hwang et al.
patent: 4053437 (1977-10-01), Liu et al.
patent: 4284527 (1981-08-01), Pullukat et al.
patent: 4384987 (1993-05-01), Hawley
Handbook of Chemistry and Physics, 50th Edition, p. B-3, 1969-1970.
Periodic Table, published in the Handbook of Chemistry and Physics, 50th edition, p. B-3, 1969-1970.

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