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US 4,051,307 AGranted
Polymerization process
AssigneeImperial Chemical Industries PLC
InventorsAnthony David Caunt, Michael Stanley Fortuin
Life of this patent
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Abstract
An olefine polymerization catalyst includes a complex compound of phosphorus having the general formula R".sub.2 P(Q).sub.a XP(Q).sub.a R".sub.2 where the various groups are defined. Typical phosphorus compounds include [(CH.sub.3).sub.2 N].sub.2 P(O)OP(O)[N(CH.sub.3).sub.2 ].sub.2. catalyst systems containing these phosphorus compounds give a high rate of polymerization together with a low proportion of soluble polymer. The phosphorus compound can be ball-milled with the titanium compound to give an improved effect.
Claims20
An olefine polymerisation catalyst comprising
- 1. a solid halide or oxyhalide compound of a transition metal of Group IVA to VIA of the Periodic Table, wherein the said metal has a valency below its maximum;
- 2. an organo-metallic compound of aluminium, or of a non-transition metal of Group II of the Periodic System, or a complex of an organo-metallic compound of a non-transition metal of Group I or II of the Periodic System, and an organo-aluminium compound;
- and
- 3. at least one phosphorus compound selected from materials of the formula
- R".sub.2 P(Q).sub.a XP(Q).sub.a R".sub.2
- wherein
- R" is halogen, a hydrocarbyl group, a group --NR'".sub.z or --OR'", a heterocyclic group, a group (E--Z--G), or both groups R" attached to the same P atom together form a group ##STR58## R"' is a hydrocarbyl group;
- X is --O--, NR""--, --E(CH.sub.2).sub.m E-- or ##STR59## R"" is a hydrogen atom or a hydrocarbyl group;
- each L is a bivalent hydrocarbyl radical and may be the same or different;
- each E is --O--, --S-- or --NR'"-- and may be the same or different;
- G is -OR'", -SR"', -NR'".sub.2, -PR'".sub.2 or a heterocyclic ring system whereof the heteroatom is O, S, N or P;
- Q is an oxygen or sulphur atom;
- Z is a bivalent hydrocarbyl radical such that E and G, or E and E are separated by not more than 3 carbon atoms;
- each a is independently zero or one;
- and
- m is a positive integer.
13 more elements
Dependencies are inferred from the claim text.