Anic S.p.a.

Snamprogetti S.p.a.

Tito Salvatori

Salvatore Cucinella

Giovanni Dozzi

Silvestro Costanzi

Alessandro Mazzei

Francesco Tessarolo

Adriano Ballabio

Marco Cesari

There are disclosed oligomeric aluminum hydride iminic derivatives, to be employed as catalysts in polymerization processes and which are prepared by causing alkali-metal or alkaline-earth-metal alanates to react with a primary amine which contains a group of the type --X--R'.sub.m, wherein X is a nitrogen atom or an oxygen atom and m is equal to the valence of X minus one. The compounds have a trimeric or a tetrameric 'open cage' spatial configuration.

Method for preparation of oligomeric iminic derivatives of aluminum

This invention relates to particular polyolefin compositions which contain, as stabilizers against UV-light radiations, open-chain amine compounds which are hindered in the alpha-position by alkyl radicals, said amine compounds corresponding to the following general formula: ##STR1## wherein R', R', R'', R.sup.IV, R.sup.V and R.sup.VI which can be equal or different, are radicals of aliphatic hydrocarbons with a number of C-atoms variable from 1 to 20, or can be hydrogen atoms, n is an integer variable from 2 to 12, and n' is an integer comprised between 1 and 15.

Polyolefin compositions stabilized against UV light radiations with

There are disclosed oligomeric aluminum hydride iminic derivatives to be employed as catalysts in polymerization processes and, which are prepared by causing alkali-metal or alkaline-earth-metal alanates to react with a primary amine which contains a group of the type --X--R'.sub.m, wherein X is a nitrogen atom or an oxygen atom and m is equal to the valence of X minus one. The compounds have a trimeric or a tetrameric 'open cage' spatial configuration.

Oligomeric iminic derivatives of aluminum hydride and method for their

Novel organic aluminum imides, highly resistant to oxidation and moisture and useful for polymerization and alkylation reactions, are prepared by reacting a poly(N-alkyliminoalane) with an aluminum alkyl, or with a halogen acid and then with an alkyl derivative of an alkali metal.

Method for the preparation of organic aluminum-imides and products

An oligomer N-alkyl-iminoalane, made up of a plurality of four and/or six member rings of the formulae: ##STR1## wherein R is an aliphatic, cycloaliphatic or aromatic hydrocarbon combined in a tridimensional cage structure having the chemical composition (HAl-NR).sub.n, in which R has the above meaning and n is a whole number lower than or equal to 10, is prepared by reacting a primary amine containing a secondary or tertiary carbon atom in alpha or beta position with respect to the amine nitrogen atom or amide derivative thereof wherein the amine radical contains a secondary or tertiary carbon atom in alpha or beta position with respect to the nitrogen atom with a complex formed by AlH.sub.3 and a Lewis base, or by reacting said primary amine with an alkali or alkaline-earth metal alanate.

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San Donato Milanese, Italy

Tito Salvatori