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    MODACRILIC FIBRE HAVING HIGH RETRACTION AND REDUCED INFLAMMABILITY AND PROCESS FOR ITS MANUFACTURE
    5.
    发明专利
    MODACRILIC FIBRE HAVING HIGH RETRACTION AND REDUCED INFLAMMABILITY AND PROCESS FOR ITS MANUFACTURE 未知

    公开(公告)号：ZA782669B

    公开(公告)日：1979-05-30

    申请号：ZA782669

    申请日：1978-05-10

    Applicant: SNIA VISCOSA

    Inventor： CAZZARO G ,  MALGERI D ,  MATERA G ,  CAVALLARO A

    IPC: D01F6/40 ,  C07C121/00

    Abstract: Modacrylic fibers having high retraction, reduced inflammability and high glossiness, prepared by wet spinning a solution, in an organic spinning solvent miscible with water, of a mixture of copolymers from acrylonitrile, vinylidene chloride, at least a vinyl ester and at least an unsaturated monomer containing at least a sulphonic group, the acrylonitrile units being from 50% to 85% by weight and the vinyl ester units from 3% to 6% by weight; hot drawing the coagulated fiber in a mixture of water and spinning solvent; drying the fiber in hot air while leaving it free concurrently to contract; and subsequently further hot drawing it in air.

    7.
    发明专利
    未知

    公开(公告)号：NO134150B

    公开(公告)日：1976-05-18

    申请号：NO65171

    申请日：1971-02-23

    Applicant: SNIA VISCOSA

    Inventor： SIOLI G ,  GIUFFRE L ,  RIGHI F ,  MATERA G

    IPC: C07D239/42 ,  B01J31/00 ,  C07B61/00 ,  C07C45/00 ,  C07C45/89 ,  C07C49/88 ,  C07C51/00 ,  C07C61/09 ,  C07C67/00 ,  C07D307/89 ,  C07C45/18

    Abstract: A method is disclosed for the preparation of alicyclic ketenes, useful as intermediates in the preparation of lactams. The instant method consists in a heat treatment of an alicyclic acid, or its anhydride, in a matallic reactor exempt from nickel, at high temperatures but under subatmospherical pressures. A catalyst of the type XP(OR)3 wherein X is selected from the group consisting of oxygen, sulphur and selenium and R is an alkyl radical is preferred for accelerating the reactions. The temperatures are in the range from 550 DEG to 750 DEG C and the preferred pressure is under 100 millimeters of mercury. High yields and conversion rates are obtained and the purity of the end product is more than satisfactory. The method can be applied to the preparation of a number of alicyclic ketenes.

    METHOD FOR THE PRODUCTION OF ALICYCLIC KETENES AND PRODUCTS OBTAINED THEREBY
    10.
    发明专利
    METHOD FOR THE PRODUCTION OF ALICYCLIC KETENES AND PRODUCTS OBTAINED THEREBY 未知

    公开(公告)号：ZA711118B

    公开(公告)日：1971-11-24

    申请号：ZA711118

    申请日：1971-02-22

    Applicant: SNIA VISCOSA

    Inventor： SIOLI G ,  MATERA G ,  GIUFFRE L ,  RIGHI F

    IPC: C07D239/42 ,  B01J31/00 ,  C07B61/00 ,  C07C45/00 ,  C07C45/89 ,  C07C49/88 ,  C07C51/00 ,  C07C61/09 ,  C07C67/00 ,  C07D307/89 ,  C07C

    Abstract: A method is disclosed for the preparation of alicyclic ketenes, useful as intermediates in the preparation of lactams. The instant method consists in a heat treatment of an alicyclic acid, or its anhydride, in a matallic reactor exempt from nickel, at high temperatures but under subatmospherical pressures. A catalyst of the type XP(OR)3 wherein X is selected from the group consisting of oxygen, sulphur and selenium and R is an alkyl radical is preferred for accelerating the reactions. The temperatures are in the range from 550 DEG to 750 DEG C and the preferred pressure is under 100 millimeters of mercury. High yields and conversion rates are obtained and the purity of the end product is more than satisfactory. The method can be applied to the preparation of a number of alicyclic ketenes.

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