Ausimont S.p.a.

Ausimont S.r.l.

Montedison S.p.a.

Alberto Re

Marco De Giorgi

Ezio Strepparola

Gianangelo Bargigia

Mario Alfieri

Francesco Giavarini

Ken Johns

Vito Tortelli

Claudio Tonelli

Gerardo Caporiccio

Padmanabhan Srinivasan

Luciano Flabbi

Tiziano Terenghi

Luigi Corbelli

Gianni Donati

Cesare Cova

Piero Gavezzotti

Fluorinated polyesters

Fluorinated polyurethanes containing blocks having a perfluoropolyethereal structure, with rubber-like properties, alternated with stiff structural units are taught. The stiff units are at least partially provided with a double bond of the olefinic type, which is suitable for causing the cross-linking of the polymeric chains with a cross-linking system of the radicalic type.

Cross-linkable polyurethane rubbers containing polyoxyperfluoroalkylene

The invention relates to polyurethanes comprising polyoxyperfluoroalkylene blocks of rubber-like nature and rigid segments derived from short-chain aliphatic diols, optionally from aliphatic diamines, and from aliphatic or cycloaliphatic or aromatic diisocyanate. The number of the rigid-type segments is equal to or greater than the number of the polyoxyperfluoroalkylene blocks. The polyurethane are characterized by a glass transition temperature lower than -80.degree. C., a tensile strength greater than 30 kg/cm.sup.2, a hardness between 50 Shore A and 75 Shore D, and good thermoforming characteristics.

Fluorinated polyurethanes endowed with improved mechanical properties,

The cross-linking or curing of thermosetting resins and of hot curable elastomers is carried out by heating the material or the article comprising the resin (or the elastomer) by saturated vapor of the commercial perfluoropolyether having an average boiling point corresponding to the temperature necessary for the cross-linking and having a point range not exceeding 12.degree. C. (measured according to ASTM D 1078) in the presence of a chlorofluorohydrocarbon secondary vapor.

Cross-linking of thermosetting resins by means of heating with saturated

A non-fluorinated epoxy prepolymer of known type is mixed with a fluorinated epoxy prepolymer containing perfluoropolyether blocks or perfluoroalkylene blocks of type --(CF.sub.2 CF.sub.2).sub.n -- and/or of type ##STR1## and the two prepolymers are co-cured by treating the mixture with cross-linking agents of known type suitable for epoxy resins, thereby obtaining a cross-linked epoxy resin having a fluorine content.ltoreq.30% by weight, preferably.ltoreq.25% by weight.

Epoxy resins prepared by co-curing fluorinated epoxy prepolymers and

Fluorinated polymers having epoxy resin structure, containing at least 10% by weight, preferably 20% by weight, of fluorine, prepared starting from epichlorohydrin and from one or more diols, at least one of which being a perfluoroalkylene diol, and by using conventional cross-linking agents for epoxy resins, such as anhydrides of dicarboxylic acids, di- or tri-isocyanates, polyfunctional amines.

Epoxy resins prepared from perfluoroalkylene telomers

The present invention relates to a method for hot curing thermosetting resins and vulcanizable elastomers, based on the use of perfluoropolyethers in the liquid state as heat transfer media.

Process for curing thermosetting resins by means of a liquid heat

Fluorinated polyisocyanates particularly suitable for the formulation of coating paints and compositions in the electronics industry, obtained by starting from a perfluoropolyether polyol having a functionality higher than 2 and from a diisocyanate, the resulting derivative having isocyanic functions being further condensed with a polyol in order to obtain a polyisocyanate with a high degree of functionality, and containing from 1.5% to 9% by weight of --NCO groups.

Fluorinated polyisocyanates suitable as paint components

Non-fluorinated epoxy resins of a known type are cross-linked by means of polyfunctional fluoroalkanes containing groups which are reactive with the epoxy groups and/or with the hydroxy groups present in the starting resin. The cross-linked products so obtained, having a fluorine content not higher than 15% by weight, and preferably ranging from 1% to 5%, exhibit a complex of properties which are typical of the corresponding fluorinated resins having a much higher fluorine content; in particular, oil- and water-repellency, resistance to hydrolysis and to solvents, and minimum absorption of water.

Fluorinated cross-linking agents for epoxy resins and process for

Non-fluorinated tertiary aminic compounds, comprising two or more functional groups containing at least three active H, of the hydroxyl or aminic or thiol type, are utilized, in the form of a homogeneous mixture with perfluoropolyethers having hydroxy end groups, to prepare by means of polycondensation and cross-linking reaction with fluorinated or non-fluorinated polyisocyanates, carried out in the absence of catalysts, the corresponding polymers containing the perfluoropolyethereal chain deriving from the perfluoropolyether having hydroxy end groups.

Use of tertiary aminic compounds containing at least three active

Fluorinated polymers having epoxy resin structure, containing at least 10% by weight, preferably 20% by weight, of fluorine, prepared starting from epichlorohydrin and from one or more diols, at least one of which is a perfluoroalkylene diol, and by using conventional cross-linking agents for epoxy resins, such as anhydrides of dicarboxylic acids, di- or tri-isocyanates, polyfunctional amines.

Non-fluorinated epoxy resins of known type are crosslinked by means of polyfunctional perfluoropolyethers containing groups which are reactive with the epoxy groups and/or with the hydroxy groups present in the starting resin. The so-obtained crosslinked products, with a fluorine content not higher than 20% by weight, preferably comprised within the range of from 5% to 15%, are endowed with a set of properties typical of the corresponding fluorinated resins with a much higher fluorine content, in particular, water- and oil-repellence, resistance to hydrolysis and to solvents, minimum water absorption.

Crosslinking of epoxy resins by means of polyfunctional

Fluorinated polyurethanes, having improved mechanical characteristics and a glass transition temperature lower than -80.degree. C., containing polyoxyperfluoroalkylene blocks deriving from perfluoropolyethers having hydroxylated end groups and/or from perfluoropolyethers having isocyanate end groups and furthermore units deriving from an aromatic or a cycloaliphatic diol.

Fluorinated polyurethanes containing polyoxyperfluoro-alkylene blocks,

New resins containing urethane and/or epoxy bonds are prepared starting from fluorinated polymers having an epoxy structure and exhibiting structural characteristics predominantly typical of epoxides or of polyols, said polymers being prepared by synthesis from one or more diols, at least one of which being a perfluoropolyoxyalkylene diol, and from epichlorohydrin; said polymers are subsequently subjected to a treatment with isocyanated if their structural characteristics are predominantly those of polyols, or with polyamines or anhydrides if their structural characteristics are predominantly those of epoxides.

Fluorinated polymers and resins prepared therefrom

This invention relates to the preparation of new fluorinated polymers starting from acrylic esters and/or acrylamides, in which the cross-linking degree of the final product is controlled by using, as a starting product, a mixture of mono- and di-acryl monomers, said monomers being characterized in that they include in their structure a perfluoropolyoxyalkylene chain.

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Milan, Italy

Alberto Re