Process for preparing narrow molecular weight distribution syndi

Details Process for preparing narrow molecular weight distribution syndi Process for preparing narrow molecular weight distribution syndi

1991-02-14

1992-07-21

Schofer, Joseph L.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525245, 525299, 526170, C08F 452, C08F25502, C08F

Patent

active

051323699

ABSTRACT:
A process for preparing a narrow molecular weight distribution syndiotactic block copolymer of an unsaturated carboxylic acid ester (e.g., acrylate of methacrylate) with an .alpha.-olefin (e.g., ethylene) by using, as an initiator, at least one organometallic compound of the group consisting of (a) trivalent organic Y compounds, and (b) trivalent organic lanthanide (La, Ce, Pr, Nd, Pm, Sm, Eu, Ga, Tb, Dy, Ho, Er, Tm, Yb, Lu) compounds, or a combination thereof with an organoaluminum compound.

REFERENCES:
patent: 4665046 (1987-05-01), Campbell, Jr.
patent: 4689368 (1987-08-01), Jenkins
patent: 4801666 (1989-01-01), Marks
patent: 5064802 (1991-11-01), Stevens et al.
patent: 5066739 (1991-11-01), Pettijohn et al.
patent: 5066741 (1991-11-01), Cambell, Jr.
J. American Society, vol. 32, pp. 459-479 (1983).
J. American Chemical Society, vol. 105, pp. 1401-1403 (1983).
J. American Chemical Society, vol. 107, pp. 8091-8103 (1985).
P. L. Watson and T. Herskovitz, "Homogenous Lanthanide Complexes" (1983) Am Chem Soc. pp. 460-479 (No complete citation avail.).
F. A. cotton and G. Wilkinson, Advanced Inorganic Chemistry, 3rd Ed., Wiley, New York, 1972, p. 52, 1056-1057.

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