T.sub.n MR'.sub.- cocatalysts

Details T.sub.n MR'.sub.- cocatalysts T.sub.n MR'.sub.- cocatalysts

1979-06-18

1980-07-29

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

526119, 526125, 526127, 526139, 526140, 526141, 526142, 526150, C08F 464

Patent

active

042150140

ABSTRACT:
A new improved catalyst system for alpha-olefin type polymerizations includes a metal alkyl cocatalyst having the formula T.sub.n MR'.sub.3-n in combination with a Group IVB-VIII transition metal compound on a support and a Lewis base wherein n is equal to one or two, T is equal to R.sub.3 DCH.sub.2, and wherein D is selected from the group consisting of Si, Ge or Sn, R is methyl or ethyl, and R' is selected from the group consisting of C.sub.1 to C.sub.8 primary alkyl or aralkyl groups including unhindered branched groups and M is selected from the group consisting of aluminum, gallium, or indium. The improved catalyst system provides both increased polymerization activity and polymers having a high degree of isotactic stereoregularity as well as lower catalyst residue.

REFERENCES:
patent: 3210334 (1965-10-01), Carrick
patent: 3661878 (1972-05-01), Aishima et al.
patent: 3670043 (1972-06-01), Kubicek et al
patent: 3784481 (1974-01-01), Lassau et al.
patent: 3790543 (1974-02-01), Lennert et al.
patent: 4011385 (1977-03-01), Wang et al.

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