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Snia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.p.a.

Snia Viscosa S.p.a. Societa Nazionale Industria Applicazioni Viscosa

Chemplast, Inc.

Roberto Leoni

Werner Gruber

Gianfranco Angelini

Alberto Baldini

Angela Rossini

Juergen Wichelhaus

Angelo Calloni

Norbert Wiemers

Italo Albini

Pietro P Rossi

Francesco Siclari

Mario De Gaetano

Massimo Taccani

Methods of producing thermoplastic poly(amide-urethane) block copolymers having excellent flexibility at low temperatures are provided. The methods comprise reacting substantially linear polyamides, the polyamides being based on dimerized fatty acids and terminated by carboxyl and/or amino groups and aliphatic or cycloaliphatic polyethers and/or reaction products thereof with 2,3-epoxypropanol. The reaction products contain substantially no free isocyanate groups or epoxide groups. The invention also relates to the use of these products as adhesives and corrosion inhibitors for metallic and/or wooden materials.

Methods of making and using thermoplastic block copolymers

Methods of producing thermoplastic poly(amide-urethane) block copolymers having excellent flexibility at low temperatures are provided. The methods comprise reacting substantially linear polyamides, the polyamides being based on dimerized fatty acids and terminated by carboxyl and/or amino groups and aliphatic or cyloaliphatic polyethers and/or reaction products thereof with 2,3-epoxypropanol. The reaction products contain substantially no free isocyanate groups or epoxide groups. The invention also relates to the use of these products as adhesives and corrosion inhibitors for metallic and/or wooden materials.

Method of making and using thermoplastic block copolymers

Thermoplastic polyamide mixtures of polyamides based on dimerized fatty acids in which at least one polyamide contains as an incorporated unit (a) a C.sub.2 -C.sub.10 aliphatic diamine capable of diamide formation, which is N-substituted with C.sub.10 -C.sub.25 -alkyl, and (b) a C.sub.2 -C.sub.40 -diamine capable of diamide formation comprising a diprimary amine, a heterocyclic amine, or a diomine containing one or two secondary amino groups and which is N-C.sub.1 -C.sub.8 -alkyl-substituted on at least one side.

Adhesive composition comprising thermoplastic polyamide from dimer acid

Thermoplastic polyamide resins with improved low-temperature flexibility and improved bonding properties consisting essentially of polycondensates of the following components:

Polyamide of dimerized fatty acids and polyether urea diamines and their

Adhesive composition comprising polyamide from dimer acid and N-alkyl

Thermoplastic polyamide resins showing improved substrate adhesion and consisting essentially of polycondensates of the following components:

Polyamide resin from dimer/trimer acid and N-alkyl diamine

The object of the invention are adhesion promoters for plastisols of polyvinylchloride polymers or copolymers, characterized in that they are constituted by polyaminoamidic resins obtained by means of the condensation of:

Adhesion promoters of plastisols, capable of maintaining plastisol color

A process for the preparation of high concentration solutions of cellulose erivatives in organic solvents comprises contacting with paraformaldehyde and the solvent a cellulose which has a polymerization degree lower than 300 and preferably not significantly higher than 200. The solvent is selected from among dimethylformamide, dimethylacetamide and N-methylpyrrolidone.

Process for the preparation of solutions of cellulose derivatives in

A process for the preparation of regenerated cellulose shaped bodies from inning dopes comprising solutions of methylol derivatives of cellulose in organic solvent selected from dimethylformamide, dimethylacetamide, dimethylsulphoxide and N-methyl-pyrrolidone is described. The cellulose derivative is coagulated from the spinning dope in a coagulating bath, the main component of which is a high-boiling alcohol capable of reacting with the free (para)formaldehyde and with the bound (para)formaldehyde of the methylol derivative to a degree varying with the temperature. It is possible to prepare filaments and yarns having excellent characteristics by starting from solutions having high CH.sub.2 O and cellulose concentrations and high MS ratios.

Process for the preparation of regenerated cellulose formed bodies from

A process for the preparation of regenerated cellulose formed bodies from lutions of cellulose derivatives in organic solvents is disclosed. The cellulose derivatives is firstly precipitated in a coagulating bath constituted of a cellulose non-solvent, non-regenerating organic liquid, then the coagulated body is drawn in subsequent baths and the cellulose is regenerated. The drawing and the regeneration occur, at least in part, concurrently.

A process for the dissolution of cellulose in organic solvents such as dihylformamide, dimethylacetamide, and N-methylpyrrolidone is described which comprises contacting the cellulose with an excess of paraformaldehyde and with the solvent at elevated temperatures, preferably higher than 115.degree. C. The amount of paraformaldehyde used preferably corresponds to at least 13 CH.sub.2 O units per anhydroglucosidic unit of the cellulose. The solution obtained can be rendered stable at room temperature by heating it under stirring to lower the paraformaldehyde content, preferably to not less than 8 CH.sub.2 O units per anhydroglucosidic unit. Formed bodies of regenerated cellulose can be obtained from said solutions by coagulating them in an aqueous bath, which may be alkaline or may be a mixture of water and the solvent of the solution, or even by evaporating the solvent.

Process for the dissolution of cellulose in organic solvents, solutions

A process for the preparation of formed bodies of regenerated cellulose f cellulose derivative solutions in dimethylsulphoxide is disclosed. The solution is extruded and coagulated in a coagulating bath which is a saline acqueous solution having a substantially non-alkaline or preferably a substantially neutral reaction, a formed body being thus produced.

Process for the preparation of formed bodies of regenerated cellulose

A process for the preparation of solutions of cellulose derivatives from which formed bodies, such as fibres or films, of regenerated cellulose can be obtained by coagulation and regeneration, e.g. by wet spinning, is disclosed. The cellulose is transformed into a methylol derivative containing more than 2 units of formaldehyde per anydroglucosidic unit, which derivative is soluble in organic solvents of the class consisting of polar aprotic solvents constituted by N-substituted amides, pyridine and formamide. The methylol derivative is prepared by treating cellulose with paraformaldehyde and dimethylsulphoxide. The methylol derivative is then dissolved in one of the aforesaid solvents, preferably dimethylformamide or dimethylacetamide, to provide spinnable viscous solutions from which formed bodies can be obtained, e.g. by spinning in an aqueous alkaline bath.

Process for the preparation of solutions of cellulose derivatives which

There is described the preparation of a flameproofing compound useful in production of cellulosic fibres having a high resistance to combustion, said preparation comprising treating a phosphonitrile halide with a saturated alcohol, treating the halogen containing alkoxy derivative thus obtained with an unsaturated alcohol, and copolymerizing the alkyl substituted alkoxy derivative product thus obtained with an unsaturated acid, forming an alkaline aqueous solution-suspension adapted to be easily and intimately mixed with alkaline aqueous solutions of cellulose xantogenate to obtain a viscous mass of cospinnable components which are co-coagulable in a cellulose xantogenate coagulating bath. Obtaining essentially homogeneous yarns including the flameproofing compound in their cross-sections.

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Milan, Italy

Roberto Leoni