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A process for producing high-quality alpha -olefin polymers with a higher yield in a long lasting stabilized manner even in the case of gas phase polymerization is provided. In the production process of alpha -olefin polymers which comprises reacting a trivalent metal halide with a divalent metal compound to obtain a solid product (I); reacting this product with at least one electron donor (ED) and at least one electron acceptor (EA), once to 10 times, and at that time, using TiCl4 at least once as the (EA) to obtain a solid product (II); combining this product with an organoaluminum compound (OAl) and an (ED) (these three being referred to as catalyst components), the improvement which comprises subjecting a part or the whole of the catalyst components to polymerization treatment with a small amount of an alpha -olefin, at least in the coexistence of the solid product (II) and (OAl), in the combination of the catalyst components to obtain a preactivated catalyst, and subjecting alpha -olefin(s) to gas phase polymerization or bulk or slurry polymerization followed by gas phase polymerization, using the catalyst.

computational linguistics - association for computational linguistics

Incremental Conceptualization for Language Production Markus Guhe (University of Edinburgh) Mahwah, NJ: Lawrence Erlbaum Associates (distributed by Psychology Press), 2007, xii+260 pp; hardbound, ISBN 978-0-8058-5624-8, $75.00