Eniricerche S.p.a.

Anic S.p.a.

Agip Petroli

Snam S.p.a.

Enichimica S.p.a.

Ugo Pedretti

Arnaldo Roggero

Francesco P La Mantia

Cesarina Bonfanti

Bruno Bresci

Pier L Magagnini

Enrico Montani

Alessandro Lezzi

Gabriele Lugli

Raffaello Sisto

Giovanni Perego

Claudio Valentini

Hassan A Hakemi

Alessandro Stopponi

Pierluigi Magagnini

Ming-de Liu

Nicoletta Maurizi

Stefano Passerini

Bruno Scrosati

Maria Andrei

Alberto Gandini

Alessandro Mazzei

Sergio Poggio

Amalia Assogna

Claudio Demofonti

Vincenzo Citta'

Simona Carrozzino

A thermotropic polyesterimide, in which the liquid-crystalline phase is of nematic structure within a useful temperature range, consists of units of formula: ##STR1## the units being in the following ratios:

Thermotropic polyesterimide, a process for its preparation, and its use

A thermotropic copolyester, which displays a liquid-crystal phase of nematic type, within a desired temperature range, contains units deriving from:

Thermotropic copolyester, process for preparing it and use thereof in

An improved process for preparing carboxylated 2-allyl-phenols of general formula (I): ##STR1## is disclosed, which consists of a first step of simultaneous esterification and etherification of a carboxylated phenol, subsequent rearrangement of the resulting product to yield allyl-carboxylated allyl-phenol and end saponification of the latter into carboxylated 2-allyl-phenol.

Process for preparing carboxylated 2-allyl-phenols

A thermotropic copolyesteramide, with a nematic structure of the liquid crystalline phase within a desired temperature range of the mesophase, contains a unit derived from: (a) a saturated .alpha., .omega.-dicarboxylic acid; (b) 4,4'-dihydroxydiphenyl; (c) p-aminobenzoic acid; (d) 2,6-dihydroxyriaphthoic acid. A copolyesteramide of this type exhibits improved characteristics, especially in regard to its elastic modulus and tensile strength, when used as a self-reinforced material or as a reinforcement material for traditional thermoplastic polymers.

Thermotropic copolyesteramide, process for its preparation and

A thermotropic copolyesteramide, with a nematic structure of the liquid crystalline phase within a desired temperature range of the mesophase, contains metered amounts of units derived from: (a) a saturated aliphatic -dicarboxylic acid; (b) 4,4'-dihydroxydiphenyl; (c) 4-hydroxybenzoic acid and (d) 4-aminobenzoic acid or (d') 4-aminophenol. This thermotropic copolyesteramide, produced by the copolymerization of monomers in the molten state, is a material with self-reinforcing characteristics capable of yielding, by normal injection or extrusion processes, remarkable molecular orientations which impart a high rigidity to the manufactured products. The copolyesteramide may be used as a reinforcement material for traditional thermoplastic polymers, by usual techniques.

Semi-aromatic copolyamides and copolyester-amides are obtained by placing an aliphatic polyamide into contact with an aromatic hydroxyacid or aminoacid, by operating at high temperature, under melting conditions, possibly in the presence of a catalyst, with a ratio of the monomer units of aliphatic polyamide to the mols of aromatic hydroxyacid or aminoacid comprised within the range of from 20:1 to 1:1. The semiaromatic copolyamides and copolyester-amides so obtained can display a thermotropic liquid-crystal behavior as a function of their content of aromatic units linked inside the molecular chain. Their elastic modulus results to be improved relatively to the alifatic polyamides used as the starting product, and the elongation at break results to be decreased. Such semiaromatic polyamides and copolyester-amides can find application in the production of high-stiffness articles, by means of moulding or extrusion processes. They can also be used as blends with the usual thermoplastic polymers, in which they act as reinforcer or compatibilizer agents.

Catalytic preparation of semi-aromatic copolyamides and

A hollow fiber of amorphous, hydroxy-ethylated poly-(2,6-dimethyl-p-oxyphenylene) (PPO-OH) with a glass transition temperature (Tg) of from 180.degree. to 200.degree. C. is disclosed, which is formed by a high-density, microporous layer on a macroporous backing, and having an outer diameter comprised within the range of from 450 to 550 .mu.m and an inner diameter comprised within the range of from 250 to 400 .mu.m. The process for preparing the hollow fibre and the use of said fibre in the processes of separation of gas mixtures are disclosed as well.

Hollow fibres of modified poly-(2,6-dimethyl-p-oxy-phenylene)

A process for preparing a modified, amorphous poly-(2,6-dimethyl-p-oxyphenylene) (PPO) comprises:

Process for preparing modified poly-(2,6-dimethyl-p-oxyphenylene)

A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains umits deriving from:

Thermotropic copolyester, process for preparing it and its use

Semi-aromatic copolyamides and copolyester-amides are obtained by placing an aliphatic polyamide into contact with an aromatic hydroxyacid or aminoacid, by operating at high temperature, under melting conditions, possibly in the presence of a catalyst, with a ratio of the monomer units of aliphatic polyamide to the mols of aromatic hydroxyacid or aminoacid comprised within the range of from 20:1 to 1:1. The semiaromatic copolyamides and copolyester-amides so obtained can display a thermotropic liquid-crystal behaviour as a function of their content of aromatic units linked inside the molecular chain. Their elastic modulus results to be improved relatively to the alifatic polyamides used as the starting product, and the elongation at break results to be decreased. Such semiaromatic polyamides and copolyester-amides can find application in the production of high-stiffness articles, by means of moulding or extrusion processes. They can also be used as blends with the usual thermoplastic polymers, in which they act as reinforcer or compatibilizer agents.

Semi-aromatic copolyamide or copolyester-amide prepared from aliphatic

A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains units deriving from: (a) a saturated bicarboxy aliphatic acid; (b) 4,4'-di-hydroxydipheryl; (c) 4-hydroxybenzoic acid; and (d) 4-hydroxy-benzoic acid bearing an alkyl substituent or a halogen atom bonded to the aromatic ring. Such a copolyester constitutes a material endowed with self-reinforcing characteristics, originating, through the usual transformation processes by injection or by extrusion techniques, marked molecular orientations, which supply the manufactured articles with high stiffness characteristics. Said material can be also used as a reinforcing agent when is mixed, by means of the usual techniques, with the traditional thermoplastic polymers.

Thermotropic copolyester from mixture of hydroxy benzoic acids

A thermotropic copolyester, having a liquid-crystallne mesophase of nematic structure within a desired range of temperatures, contains units derived from:

Thermotropic copolyester and process for preparing it and use thereof

Thermotropic copolyazomethines having a mesophase temperature range lying within a desired range of values are obtained by copolymerizing terephthalic aldehyde with at least two different 1,n-bis(4-aminophenoxy)alkanes. Such copolyazomethines are particularly useful as reinforcing materials for the usual thermoplastic polymers, such as polycarbonate, polybutyleneterephthalate, polyethyleneterephthalate and polyamides.

Thermotropic copolyazomethines and process for preparing them

A solid polymeric electrolyte is constituted by a solid solution of an ionic compound in a cross-linked polyether, wherein this latter is the copolymerization product of a vinyl-ether of formula:

Solid polymeric electrolyte and electrochemical generators containing it

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.

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Milan, Italy

Ugo Pedretti