中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

110 records (took 0.021 seconds)

    Batch direct esterification of terephthalic acid with ethylene glycol - using slurry pumped from remote storage vessel to esterification reactors
    4.
    发明专利
    Batch direct esterification of terephthalic acid with ethylene glycol - using slurry pumped from remote storage vessel to esterification reactors 未知

    公开(公告)号：FR2427324A1

    公开(公告)日：1979-12-28

    申请号：FR7913519

    申请日：1979-05-28

    Applicant: TORAY INDUSTRIES

    Inventor： IKEUCHI HIROYUKI ,  KUSUNOKI KAZUHISA ,  SUGANUMA HEIROKU

    IPC: C07C67/08 ,  C07C69/82

    Abstract: Batch direct esterification of terephthalic acid (I) with ethylene glycol (II) is carried out as follows. A slurry of (I) and (II) is prepd. at a controlled rate and with a (II):(I) molar ratio of 0.80-1.70 and the slurry is transferred to a storage vessel. It is then transferred from this to a feed vessel in an esterification zone, using a pump under the storage vessel, then to a prim. feed pipe using a prim. slurry feed pump below the feed vessel and finally to a number of batch esterification vessels using several sec. slurry feed pumps, each connecting the prim. feed pipe with one esterification vessel. Esterification is carried out in the presence of esterification prods. at a pressure of -0.5 to 1.0 kg/cm2G. The process gives prods. consisting mainly of bis(beta-hydroxyethyl) terephthalate (III) and/or its oligomers, which are useful for the prodn. of many polyesters of suitable quality for various applications. The stable slurry is transported over a long distance and is convenient to handle. Sepn. of the zone where finely-divided (I) is handled from the esterification zone prevents contamination of PET with (I) dust. No pressure vessels are needed, which facilitates periodic repair or cleaning of individual vessels. High conversions can be obtd. and copolymerisation and addn. reactions can be carried out easily in the esterification stage, making the process suitable for making small amts. of various prods.

    6.
    发明专利
    未知

    公开(公告)号：DE3788504D1

    公开(公告)日：1994-01-27

    申请号：DE3788504

    申请日：1987-10-01

    Applicant: TORAY INDUSTRIES

    Inventor： SUGANUMA HEIROKU ,  TANEICHI SHOSHIRO ,  MATSUNAGA TADAYO ,  KOBAYASHI HISAAKI

    IPC: D01F8/04 ,  G02B6/16 ,  D01F2/04

    Abstract: An optical fibre of sheath-core structure has for its core a copolymer which includes an aliphatic N-substituted maleimide as a monomer unit, and preferably methyl methacrylate as a further monomer unit. Such optical fibres have high light transmittance, good mechanical characteristics and an excellent heat-resisting durability.

    8.
    发明专利
    未知

    公开(公告)号：DE3788504T2

    公开(公告)日：1994-05-19

    申请号：DE3788504

    申请日：1987-10-01

    Applicant: TORAY INDUSTRIES

    Inventor： SUGANUMA HEIROKU ,  TANEICHI SHOSHIRO ,  MATSUNAGA TADAYO ,  KOBAYASHI HISAAKI

    IPC: D01F8/04 ,  G02B6/16 ,  D01F2/04

    Abstract: An optical fibre of sheath-core structure has for its core a copolymer which includes an aliphatic N-substituted maleimide as a monomer unit, and preferably methyl methacrylate as a further monomer unit. Such optical fibres have high light transmittance, good mechanical characteristics and an excellent heat-resisting durability.

Patent Agency Ranking