Snamprogetti

Eniricerche S.p.a.

Enitecnologie S.p.a.

Enichimica S.p.a.

Giovanni Perego

Giuseppe Bellussi

Carlo Perego

Bruno Notari

Ugo Pedretti

Roberto Millini

Marco Taramasso

Giannino Pazzucconi

Gianluca Bassi

Arnaldo Roggero

Gabriele Lugli

Giovanni Dozzi

Bruno Bresci

Pierluigi Magagnini

Carlo Busetto

Simona Carrozzino

Process for the preparation of a micro-mesoporous gel consisting of a silica matrix in which one or more metal oxides are possibly dispersed comprising: (a) subjecting to hydrolysis and gelification a tetra-alkylorthosilicate with an alkyl-trimethylammonium hydroxide having the formula R(CH,),N&mdash;OH, wherein R is selected from n-butyl, n-pentyl, n-hexyl and n-heptyl, possibly in the presence of one or more metal compounds, the molar ratios in this mixture being: R&mdash;OH/SiO,&equals;0-10; R(CH,),N&mdash;OH/SiO,&equals;0.05-0.4; H,O/SiO,&equals;5-40; metal oxides/SiO,&equals;0-0.02; whereas the ratio H,O/R(CH,),N&mdash;OH varies according to the number of carbon atoms in the alkylic chain R as follows: R&equals;n-butyl, H,O/R(CH,),N&mdash;OH<35; R&equals;n-pentyl, H,O/R(CH,),N&mdash;OH<70; R&equals;n-hexyl, H,O/R(CH,),N&mdash;OH<102; R&equals;n-heptyl, H,O/R(CH,),N&mdash;OH<136; (b) subjecting the gel or solid obtained in step (a) to drying and calcination.

Process for the preparation of micro-mesoporous gel

Micro-mesoporous gel consisting of a silica matrix possibly wherein one or more metal oxides selected from transition metals or metals belonging to groups IIIA, IVA and VA are uniformly dispersed, characterized by a monomodal porosity distribution.

Micro-mesoporous gel and process for its preparation

A thermotropic copolyester, having a nematic structure of the liquid-crystalline phase within a desired range of mesophase temperature, contains units derived from a saturated aliphatic dicarboxylic acid, 4,4'-dihydroxy-biphenyl and p-hydroxybenzoic acid, in a mutual ratio of from 1:1:0.5 to 1:1:8. This thermotropic copolyester is produced by copolymerizing in the molten state a saturated aliphatic dicarboxylic acid, 4,4'-diacyloxybiphenyl and p-acyloxybenzoic acid. The use is disclosed of the thermotropic copolyester as a self-reinforced material, and as a reinforcer material for such traditional thermoplastic polymers as polybutylene terephthalate, polyethylene terephthalate, polycarbonate and nylon.

Thermotropic copolyester having a nematic structure of the

Novel polyacetylene films are disclosed, having the following properties:

High-orientability polyacetylene films and process for their production

An improved process is disclosed for producing alumino-silicates having a porous structure, of the zeolite class, the process essentially comprising the step of preparing a homogeneous aqueous mixture containing a source of alumina, a source of silica and alkali metal bases and/or alkaline earth metal bases, the improvement consisting in adding to said mixture at least one substance which contains at least a hydroxyl group in its molecule. The advantages are that the use of nitrogenous organic substances, universally used heretofore for the preparation of certain zeolites, can be dispensed with inasmuch as the alkali metal ion is capable, alone, of displaying the counter-ion function.

Method for preparing aluminum-silicate having a zeolite-like structure

This invention relates to a porous crystalline synthetic material constituted by silicon and titanium oxides, a method for synthesizing said material, and the use thereof as a catalyst. Said material is given the name titanium silicalite or TS-1, and corresponds to the following formula:

Preparation of porous crystalline synthetic material comprised of

The present invention provides novel oligomer derivatives of aluminum hydride having the general formula:

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Milan, Italy

Giovanni Perego