Showa Denko K.k.

Hajime Yasuda

Akira Nakamura

Shigenobu Miyake

A process for preparing a narrow molecular weight distribution syndiotactic polymer or copolymer of an unsaturated carboxylic acid ester (e.g., acrylate or methacryrate) 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 having the formula:

Process for preparing narrow molecular weight distribution syndiotactic

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.

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Hiroshima, Japan

Hajime Yasuda