Montedison S.p.a.

Himont Italia S.r.l.

Istituto Guido Donegani S.p.a.

Alfredo Coassolo

L Lawrence Chapoy

Marco Foa'

Marco Foa

Giampiero Sabarino

Andrea Gardano

Francesco Casagrande

Larry L Chapoy

Umberto Giannini

Carlo Venturello

Rino D'Aloisio

Giovanni Giunchi

Enzo Alneri

Mauro Maritano

Giuseppe Motroni

Thermotropic melt processable liquid crystalline aromatic polyesters comprising units derived from a dicarboxylic acid and from a mixture of aromatic diols in which from 50% to 80% is (1-phenylethyl)hydroquinone and from 20% to 50% is hydroquinone.

Thermotropic liquid crystal aromatic polysters

A process for the synthesis of phenyl substituted aromatic diols, obtained by dehydrogenation of the corresponding substituted cyclohexyl derivatives in the presence of a palladium supported catalyst, said palladium supported catalyst being prepared by a process which comprises treating a palladium hydrolysis compound with reducing agents.

Process for the synthesis of aromatic phenyl substituted diols

Melt-formable thermotropic liquid crystalline polymers containing groups derived from terephthalic acid and a mixture of phenyl hydroquinone, 2-(.alpha.-phenylisopropyl) hydroquinone and, if desired, 2,5 bis (.alpha.-phenylisopropyl) hydroquinone.

Thermotropic liquid crystalline polymers

Liquid-crystalline, thermotropic, aromatic polyesters processable in the molten state, comprising units derived from hydroquinone mono- and possibly di-substituted with aralkyl groups.

Liquid-crystalline, thermotropic aromatic polyesters

Thermotropic liquid-crystalline aromatic polyesters processable in the molten state, comprising units derived from at least one dicarboxylic aromatic acid and from mono- and di-substituted (1-phenyl-ethyl)-hydroquinones in admixture with hydroquinone, and/or hydroquinones substituted with halogen or alky, aryl or cycloalkyl groups.

Termotropic liquid-crystalline aromatic polyester from

Thermotropic liquid crystalline aromatic polyesters of 3,3'-diphenyl-4,4'-dihydroxydyphenyl containing units derived from mono-substituted hydroquinones in amounts over 10% by moles with respect to the total of the aromatic diols.

Thermotropic liquid crystalline aromatic polyester from 3,3'-diphenyl-4,4'-

Thermotropic liquid crystalline polyesters which can be processed in the molten state containing moieties derived from a dicarboxylic aromatic acid and 2,5-dihydroxybenzophenone eventually in a mixture with a substituted hydroquinones.

Thermotropic liquid crystalline polyester from 2,5-dihydroxybenzophenone

Thermotropic liquid crystalline aromatic polyesters of 4,4'-dihydroxydiphenyl substituted in 3,3' positions by a halogen or by an alkyl, cycloalkyl or aralkyl radical.

Thermotropic liquid crystalline aromatic polyesters of disubstituted

Thermotropic liquid-crystalline aromatic polyesters of 4,4'-dihydroxy-diphenyl substituted with a halogen or with an alkyl, cycloalkyl, aryl, aralkyl, keto or ether radical.

Thermotropic liquid-crystalline aromatic polyesters of substituted

Thermotropic semiflexible polyesters are taught which are obtained by polycondensation of 4,4'-dihydroxybicyclohexyl with at least one .alpha.,.omega.- alkandioic acid of general formula:

Polyesters of 4,4'dihydroxybicyclohexyl

There is described a process for preparing alkyl esters of methyltartronic acid by hydroxylation of methacrylic acid to alpha-methylglyceric acid with H.sub.2 O.sub.2, in an aqueous medium, in the presence of H.sub.2 WO.sub.4 and optionally of H.sub.3 PO.sub.4 or H.sub.3 AsO.sub.4 or alkaline salts thereof as catalysts, at pH&lt;2 and at temperatures of from 50.degree. to 100.degree. C., by subsequent oxidation of alpha-methylglyceric acid to methyltartronic acid with HNO.sub.3 in excess or with O.sub.2, in an aqueous-alkaline medium, in the presence of Pd or Pt carried on carbon or oxides thereof as catalysts, at temperatures of 60.degree.-100.degree. C., and final esterification of methyltartronic acid with alcohols C.sub.1 -C.sub.4.

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Novara, Italy

Alfredo Coassolo