Enichem S.p.a

Barbara Milani

Anna Sommazzi

Giovanni Mestroni

Fabio Garbassi

Francesco Masi

Antonio Alfonso Proto

Gianni Corso

Lidia Vicentini

Organometallic complex having the formula (IAP)M(X) which can be used for die formation of catalytic systems wherein: M is a metal selected from transition metals and lanthanides, in oxidation state &ldquo;s&rdquo; positive and different from zero; each X is independently a group of an anionic nature bound to the metal as an anion in an ionic couple or with a convalent bond of the &ldquo;&sgr;&rdquo; type; &ldquo;n&rdquo; expresses the number of X groups sufficient for neutralizing the formal &ldquo;&plus;s&rdquo; charge of the metal M, and (IAP) represents a neutral bond consisting of a mono-imine of 2,6-diacylpyridine. Said complex is prepared with relatively simple methods and can be used, combined with a suitable co-catalyst, such as for example, an aluminoxane, as a catalyst in normal (co)polymerization processes of &agr;-olefins, and especially ethylene.

Metal complexes comprising a 2,6-diacylpyridine-ligand and their use in the polymerization of ethylene

A process for the preparation of alternated linear copolymers based on carbon monoxide and one or more compounds having an unsaturation of the alkenylic type comprises, reacting in a halogenated aromatic or aliphatic solvent the carbon monoxide and one or more compounds having an alkenylic unsaturation in the presence of a catalyst having general formula (I)

Process for the preparation of copolymers based on carbon monoxide and

Linear alternating copolymers of carbon monoxide and at least one compound containing an alkenyl unsaturation are obtained by reaction between carbon monoxide and at least one compound containing an alkenyl unsaturation, in a solvent which is liquid under the operating conditions, in the presence of a preformed bischelated catalyst having general formula (I) active without cocatalysts:

Process for the preparation of copolymers of carbon monoxide and at

An improved process is described for the preparation of alternating linear copolymers based on carbon monoxide and at least one compound containing an alkenyl unsaturation which comprises reacting in a liquid solvent under the operating conditions, a mixture of carbon monoxide and one or more compounds containing an alkenyl unsaturation in the presence of: (i) a catalyst having general formula (I)

Process for preparing straight, alternate polymers based on carbon monoxide and at least one olefin, which comprises causing carbon monoxide and the olefin to react in the presence of:

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Gorizia, Italy

Barbara Milani