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    1.
    发明专利
    未知

    公开(公告)号：IT1192247B

    公开(公告)日：1988-03-31

    申请号：IT2054078

    申请日：1978-02-24

    Applicant: SNIA VISCOSA

    Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  ANGELINI GIANFRANCO

    IPC: C08B1/00 ,  C08J3/09 ,  D01F2/08 ,  C08B

    Abstract: 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.

    2.
    发明专利
    未知

    公开(公告)号：IT1112577B

    公开(公告)日：1986-01-20

    申请号：IT2210979

    申请日：1979-04-24

    Applicant: SNIA VISCOSA

    Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  CALLONI ANGELO ,  ANGELINI GIANFRANCO

    IPC: C08B16/00 ,  D01F2/00 ,  C08B

    Abstract: A process for the preparation of regenerated cellulose shaped bodies from spinning 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 CH2O and cellulose concentrations and high MS ratios.

    4.
    发明专利
    未知

    公开(公告)号：DE3015565A1

    公开(公告)日：1980-11-06

    申请号：DE3015565

    申请日：1980-04-23

    Applicant: SNIA VISCOSA

    Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  CALLONI ANGELO ,  ANGELINI GIANFRANCO ,  BUSCATE MAILAND

    IPC: C08B16/00 ,  D01F2/00 ,  D01F13/02 ,  C08J11/04

    Abstract: A process for the preparation of regenerated cellulose shaped bodies from spinning 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 CH2O and cellulose concentrations and high MS ratios.

    PROCESS FOR THE PREPARATION OF SOLUTIONS OF CELLULOSE DERIVATIVES WHICH CAN BE COAGULATED AND SPUN TO FORM REGENERATED CELLULOSE BODIES
    6.
    发明专利
    PROCESS FOR THE PREPARATION OF SOLUTIONS OF CELLULOSE DERIVATIVES WHICH CAN BE COAGULATED AND SPUN TO FORM REGENERATED CELLULOSE BODIES 未知

    公开(公告)号：CA1110009A

    公开(公告)日：1981-10-06

    申请号：CA322225

    申请日：1979-02-23

    Applicant: SNIA VISCOSA

    Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  ANGELINI GIANFRANCO

    IPC: D01F2/28 ,  C08B1/00 ,  C08B15/08 ,  C08J3/09 ,  D01F2/00 ,  C08L1/28

    Abstract: : A process for the preparation of solutions of cellulose dericatives 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 od dimethylacetamide, to provide spinnable viscous solutions from which formed bodies can be obtained, e.g. by spinning in an aqueous alkaline bath.

    7.
    发明专利
    未知

    公开(公告)号：DE3021146A1

    公开(公告)日：1980-12-18

    申请号：DE3021146

    申请日：1980-06-04

    Applicant: SNIA VISCOSA

    Inventor： LEONI ROBERTO ,  BALDINI ALBERTO ,  CALLONI ANGELO ,  ANGELINI GIANFRANCO ,  BUSCATE MAILAND

    IPC: C08B15/00 ,  C08B1/00

    Abstract: A process for the preparation of high concentration solutions of cellulose derivatives 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.

    8.
    发明专利
    未知

    公开(公告)号：DE2631518A1

    公开(公告)日：1977-01-20

    申请号：DE2631518

    申请日：1976-07-10

    Applicant: SNIA VISCOSA

    Inventor： SICLARI FRANCESCO ,  ROSSI PIETRO PAOLO ,  LEONI ROBERTO ,  GAETANO MARIO DE

    IPC: D01F2/08 ,  C08L1/06 ,  D01F2/10 ,  D01F1/10

    Abstract: There is described the preparation of a flameproofing compound useful in the 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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