中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

67 records (took 0.019 seconds)

    57.
    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.

    58.
    发明专利
    未知

    公开(公告)号：DE2353821A1

    公开(公告)日：1974-05-09

    申请号：DE2353821

    申请日：1973-10-26

    Applicant: SNIA VISCOSA

    Inventor： ROSSI PIETRO PAOLO ,  SICLARI FRANCESCO

    IPC: C08L1/00 ,  C07F9/54 ,  D01F2/08 ,  D01F2/10 ,  D01F3/10

    Abstract: A method is disclosed for producing cellulosic and/or polynosic fibres having flame-resisting properties, the improvement consisting in the fact that a composite viscose is spun in an acidic bath, said composite viscose being obtained by the association in an aqueous solvent, of cellulose xanthate with a phosphorus and nitrogen compound, dissolved in the same aqueous solvent and capable of being converted, while cellulose is being regenerated in said acidic bath, into a state of substantial insolubility. The phosphorus and nitrogen compound is a compound obtained by reacting a phosphonium derivative with aminoacids and amines and/or ammonia. A preferred compound is tetrakis-hydroxymethylphosphonium chloride. By so doing, an efficient flame-retarding protection is obtained for the fibre without sacrificing the physical properties thereof. Critical quantities, reaction conditions and test results are reported.

    60.
    发明专利
    未知

    公开(公告)号：DE1695751A1

    公开(公告)日：1971-04-22

    申请号：DE1695751

    申请日：1967-07-24

    Applicant: SNIA VISCOSA

    Inventor： SICLARI FRANCESCO ,  MESSINA GIUSEPPE ,  HORAK EDGARDO

    IPC: C07D201/16 ,  C07D41/06

    Abstract: An improved process for the purification of caprolactam obtained by nitrosation of cyclohexylic compound in which chemical processes act selectively on the amide-type volatile bases present in crude caprolactam to transform them into compounds sufficiently differentiated from caprolactam to be readily removed. The crude caprolactam is treated with a halogen and an alkaline agent in presence of water which converts the amides into amines and these may be separated by known treatments e.g. with ion exchange resins. An alkali hypohalite may also be used. The temperature may be 0 deg.-70 deg.C., preferably 10 deg.-20 deg.C. The new process facilitates removal of amide-type volatile bases to give higher yields of pure caprolactam capable of polymerisation.

Patent Agency Ranking