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18 records (took 0.02 seconds)

    11.
    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.

    13.
    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.

    17.
    发明专利
    未知

    公开(公告)号：FR2455100A1

    公开(公告)日：1980-11-21

    申请号：FR8009286

    申请日：1980-04-24

    Applicant: SNIA VISCOSA

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

    IPC: C08B16/00 ,  D01F2/00 ,  D01F2/24 ,  D01D5/06

    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.

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