Montedison S.p.a.

Novaol S.r.l.

Farmitalia Carlo Erba

Himont Incorporated

Ministero Dell 'universita'e Della Ricerca Scientifica E Technologica

Himont Italia S.r.l.

Ministero Dell'universita'e Della Ricerca Scientifica Technologica

Marco Foa'

L Lawrence Chapoy

Alfredo Coassolo

Andrea Gardano

Giampiero Sabarino

Tiziana Milizia

Francesco Casagrande

Sauro Strologo

Fernanda Farachi

Catia Bastioli

Giovanni Floridi

Umberto Giannini

Franco Francalanci

Pietro Cesti

Marcello Marchi

Giandomenico Cella

Gianfranco Cainelli

Maria Altamura

Norberto Gatti

Franco Dallatomasina

Larry L Chapoy

Elena Bencini

Stefano Cambiaghi

Achille U Ronchi

A method of synthesizing biodegradable aliphatic polyesters from one or more aliphatic dicarboxylic acids or diesters of the said acids and one or more linear or branched aliphatic glycols, comprising a first esterification or transesterification step and a second deglycolation under vacuum step, in which the catalyst is monobutylstannoic acid both for the esterification or transesterification step and for the deglycolation under vacuum step.

Simplified method of producing biodegradable aliphatic polyesters

Polyester resins formed by recurring units X&equals;&lsqb;O&mdash;(CH ) &mdash;OCO&mdash;(CH ) &mdash;CO&rsqb; and/or Y&equals;&lsqb;O&mdash;(CH ) &mdash;CO&rsqb;, where the half-sum of n&plus;m is equal to or greater than 6 and k is a number equal to or greater than 6, or by copolymers comprising units and/or sequences having the formula x &lsqb;O&mdash;(CH ) &mdash;OCO&mdash;(CH ) &mdash;CO&rsqb;; y &lsqb;O&mdash;(CH ) &mdash;CO&rsqb; where: i,j&equals;1-5; n &equals;2-22; m &equals;0-20; k &equals;1&equals;21; (Formula (1)) and x and y vary between 0 and 1 and are molar fractions of the various units such that (Formula (2)), are used for the preparation of products in which a permeability to water vapour of less than 350 g&times;30 &mgr;m/m per day, measured at 38&deg; C. and 90% RH and good biodegradability are required.

Use of polyester resins for the production of articles having good properties as barriers to water vapor

Process for the preparation of carboxylic acids and esters thereof by

Process for recovering and re-using cobalt and tungsten from reaction liquors, in which said reaction liquors are treated:

Process for recovering cobalt and tungsten from reaction liquors

A process for preparing a compound of formula I: ##STR1## wherein R.sub.1 represents a hydroxy protecting group and R.sub.2 represents a carboxy protecting group, which comprises:

Process for preparing penems

An aromatic polyesteramide possessing thermotropic liquid crystalline polymer characteristics, which are easily workable in the molten state and have the mesogenic group in the main chain, are obtained by condensing possible substituted aminophenols and hydroquinone derivatives with aromatic dicarboxylic acids.

Thermotropic polyesteramides

New organic phosphites of the formula ##STR1## are used as stabilizers for polymers and other organic materials. The definition of groups R, R', and R.sub.1 may be found in the disclosure.

Organic phosphites suitable as stabilizers for polymers

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

Thermoplastic linear aromatic polyetherdiketones containing repeating units of formula: ##STR1## wherein R is an arylene radical containing from 1 to 3 aromatic rings directly joined among them, or condensed, or joined by one or more of the following difunctional groups:

Thermoplastic linear aromatic polyetherdiketones and process for

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'-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

A process for the manufacture of o-nitrobenzaldehyde by oxidation of o-nitrotoluene, characterized in that o-nitrotoluene is made to react with an aqueous solution containing Cerium.sup.iv perchlorate and from 5 to 9 moles/liter of perchloric acid; according to a preferred embodiment, the dispersion of o-nitrotoluene in an aqueous solution containing from 5 to 9 moles per liter of perchloric acid is first prepared and then an aqueous solution is gradually added, containing Cerium.sup.iv perchlorate and 5-9 moles/liter of perchloric acid.

Process for the manufacture of o-nitrobenzaldehyde

A process is herein described for preparing carboxylated organic compounds (acids, esters, alkaline salts) of formula ##STR1## wherein R is a hydrocarbyl group having up to 11 carbon atoms (an aliphatic, alicyclic, aryl- or heteroarylalkyl group), also substituted, in its turn, by groups inert under the reaction conditions (alkyl, aryl, etheric, thioetheric, halogen, nitrile, ester, amide, ketonic groups), and R' is a hydrogen atom or an alkyl C.sub.1 -C.sub.8 group, by reaction of carbon monoxide with the corresponding hydrocarbyl halides, having the halogen bound to a non-tertiary carbon atom, in the presence of catalysts which are salts of cobalt hydrocarbonyl, or precursors thereof, in a hydro-alcoholic or alcoholic solvent and in the presence of bases. The process is characterized in that the catalytic system composed by the salt of cobalt hydrocarbonyl is supported on an anion exchange resin. The process permits to operate also continuously, in any case allowing an easy recovery, recycle and regeneration of the catalysts. The products obtained, i.e. carboxylic acids, esters and alkaline salts thereof, are utilized as intermediates for organic syntheses particularly for fine chemistry (phytopharmaceuticals, pharmaceuticals, etc.).

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Novara, Italy

Marco Foa'