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    11.
    发明专利
    未知

    公开(公告)号：DK311076A

    公开(公告)日：1977-01-12

    申请号：DK311076

    申请日：1976-07-09

    Applicant: SNIA VISCOSA

    Inventor： SICLARI F ,  ROSSI P P ,  LEONI R ,  GAETANO M

    IPC: D01F2/08 ,  C08L1/06 ,  D01F2/10 ,  D01F

    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.

    METHOD OF PRODUCING CELLULOSIC FILAMENTS
    14.
    发明专利
    METHOD OF PRODUCING CELLULOSIC FILAMENTS 未知

    公开(公告)号：IN141011B

    公开(公告)日：1977-01-08

    申请号：IN2362CA1973

    申请日：1973-10-24

    Applicant: SNIA VISCOSA

    Inventor： SICLARI F ,  ROSSI P

    IPC: C08L1/00 ,  C07F9/54 ,  D01F2/08 ,  D01F2/10 ,  D01F3/12

    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.

    19.
    发明专利
    未知

    公开(公告)号：IT979493B

    公开(公告)日：1974-09-30

    申请号：IT2087173

    申请日：1973-02-26

    Applicant: SNIA VISCOSA

    Inventor： SICLARI F ,  MAGNONI F

    IPC: B01D1/22 ,  C08F2/00 ,  C08G63/00 ,  C08G63/78 ,  C08G85/00 ,  F16C33/10 ,  F16N15/00 ,  C08F

    Abstract: 1426129 Polymerization process SNIA VISCOSA SOC NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA SpA 25 Feb 1974 [26 Feb 1973] 8425/74 Heading C3R In a polymerization process wherein the reaction mixture is passed through a series of thin layer evaporators, the lower bearings of the rotors which are inside the evaporators are lubricated with some of the polymer being formed and which has suitable physical properties. The polymer increases in molecular weight as it passes through the series of evaporators and some is withdrawn at the point where the viscosity at the operating temperature is suitable for its use as a lubricant. The polymerization may be an esterification, e.g. the manufacture of polyethylene terephthalate, and the polymer may be used as a lubricant when it has an intrinsic viscosity of 0À15 to 0À30.

    20.
    发明专利
    未知

    公开(公告)号：NO122604B

    公开(公告)日：1971-07-19

    申请号：NO15243564

    申请日：1964-03-14

    Applicant: SNIA VISCOSA

    Inventor： D ALO B ,  PERAZZONI P ,  BELLANO A ,  CICERI L ,  SICLARI F ,  GIACOBONE P

    IPC: D01D1/04 ,  D01D1/06 ,  D01D1/10 ,  D01F6/60

    Abstract: 1,019,099. Melt-spinning polyamides. SNIA VISCOSA SOC. NATURALE INDUSTRIA APPLICAZIONI VISCOSA S.p.A. March 10, 1964 [March 15, 1963], No. 10026/64. Heading B5B. In melt-spinning polyamides, the polymer chips, after having been dried, by heating in vacuo, are artificially cooled, or allowed to cool spontaneously, in an atmosphere of inert gas to a temperature not exceeding 50‹ C., and preferably between 25‹ and 30‹ C., before being transferred to the feed hopper of the melt-spinning apparatus, preferably while still surrounded by an atmosphere of the inert gas. The chips may be artificially cooled or allowed to cool spontaneously in the apparatus in which they have been dried in vacuo, a dry inert gas such as dry nitrogen having been introduced into the drying chamber until the interior of the latter is at atmospheric pressure and cold water being circulated through the jacket of the drying chamber (which may be rotated to tumble the chips) until they have been cooled to the desired temperature. Alternatively the chips may be cooled, while they are being mechanically conveyed from the drier to the melt-spinning apparatus, by contacting them with a stream of a cooled dry inert gas such as dry nitrogen. In either case the initial humidity of the inert gas may be so controlled so that it does not exceed a predetermined level, such as 70 milligrams of moisture per cubic metre of gas. In a third method the hot dry chips are discharged from the drying chamber on to a hollow horizontal metallic plate through the interior of which flows a stream of cold water. The plate is enclosed in a chamber through which flows a stream of dry nitrogen and the polymer chips are caused to travel along the entire length of the plate by vibrating the plate. The cooled chips are discharged into a duct through which they are pneumatically conveyed to the melting apparatus by a current of dry nitrogen.

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