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37 records (took 0.021 seconds)

    35.
    发明专利
    未知

    公开(公告)号：IT969954B

    公开(公告)日：1974-04-10

    申请号：IT3097872

    申请日：1972-10-26

    Applicant: SNIA VISCOSA

    Inventor： ROSSI P ,  SICLARI F

    IPC: C08L1/00 ,  C07F9/54 ,  D01F2/08 ,  D01F2/10 ,  D01C

    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.

    36.
    发明专利
    未知

    公开(公告)号：BR7107054D0

    公开(公告)日：1973-03-29

    申请号：BR705471

    申请日：1971-10-21

    Applicant: SNIA VISCOSA

    Inventor： MORANDI B ,  SICLARI F ,  MAGNONI F

    IPC: B01F3/12 ,  C08G63/78

    Abstract: 1374623 Mixing SNIA VISCOSA SOC NAZIONALE INDUSTRIA APPLICAZION I VSCOSA SpA 21 Oct 1971 [12 Oct 1970] 49047/71 Heading B1C Apparatus, e.g. for forming a homogeneous paste from terephthalic acid and ethylene glycol as a stage in polyester production comprises a vessel 10, means 22, 24 for feeding metered quantities of the materials to be mixed into the vessel 10, mechanical mixing means 12, means 26 for continuously removing the paste, and heat removing means for limiting the mixing temperature to not above 50‹C. The mixing means 12 may comprise vertical blades 12' driven by a motor 14, cooling water, e.g. at 15‹C being circulated through a jacket 16 with an inlet 18 and outlet 20. The paste, removed by a valve 26 and pump 28 may be recirculated through conduits 30, 32, 34 provided with sampling means 38, while pumps 42, 44 provided with valves 46, 48 control flow through a duct 50, e.g. to an esterification reactor.

    37.
    发明专利
    未知

    公开(公告)号：SE301690B

    公开(公告)日：1968-06-17

    申请号：SE319764

    申请日：1964-03-13

    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 ,  D01D1/00

    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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