Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1980-03-06
1982-01-12
Garvin, Patrick
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
526125, 526141, 526142, 526139, 526140, 252431R, 252431C, 252431N, 252431P, C08F 462, C08F 464, C08F 468
Patent
active
043104398
ABSTRACT:
A new improved catalyst system for alpha-olefin type polymerizations, includes at least one metal alkyl compound having the formula R.sub.3 '' M in combination with a Group IVB-VIII transition metal compound on a support and at least one hindered Lewis base and at least one unhindered Lewis base wherein R is selected from the group consisting of C.sub.1 to C.sub.20 secondary or tertiary alkyl, cycloalkyl, alkenyl or aralkyl groups; M is selected from the group consisting of aluminum, gallium, or indium. The improved catalyst system provides polymers having increased isotactic stereoregularity as well as lower catalyst residue.
REFERENCES:
patent: 3663450 (1972-05-01), Cozewith et al.
patent: 4038471 (1977-07-01), Castner
patent: 4072809 (1978-02-01), Rogan
patent: 4158642 (1979-06-01), Langer
Exxon Research & Engineering Co.
Garvin Patrick
Nanfeldt Richard E.
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