中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

21 records (took 0.01 seconds)

    VORRICHTUNG ZUR HERSTELLUNG VON PULVERFÖRMIGEM POLY(METH)ACRYLAT
    1.
    发明公开
    VORRICHTUNG ZUR HERSTELLUNG VON PULVERFÖRMIGEM POLY(METH)ACRYLAT 审中-公开

    公开(公告)号：EP3377212A1

    公开(公告)日：2018-09-26

    申请号：EP16797861.8

    申请日：2016-11-16

    Applicant: BASF SE

    Inventor： KRUEGER, Marco ,  POSSEMIERS, Karl ,  SCHLIWA, Rudolf ,  BAYER, Robert

    IPC: B01J8/24 ,  B01J8/12

    CPC classification number: B01J19/245 ,  B01J4/002 ,  B01J8/0055 ,  B01J8/1818 ,  B01J8/22 ,  B01J19/06 ,  B01J19/24 ,  B01J2208/00761 ,  B01J2219/185 ,  C08F120/14

    Abstract: The invention relates to a device for producing poly(meth)acrylate in powder form, said device comprising: a reactor (1) for droplet polymerization having a device for dropletizing (5) a monomer solution for the production of the poly(meth)acrylate which has holes through which the solution is introduced; a feed point (13) for a gas above the device for dropletizing (5); at least one gas discharge point (19) at the periphery of the reactor (1); and a fluidized bed (11), wherein the reactor (1) comprises a reactor shell (35) between the device for dropletizing (5) and the gas discharge point (19) and has, above the fluidized bed (11), a region (9) having a hydraulic diameter which decreases in the direction of the fluidized bed, the maximum hydraulic diameter thereof being larger than the average hydraulic diameter of the reactor shell (35), and wherein the reactor shell (35) projects into the region (9) having a decreasing hydraulic diameter so that an annular channel (21) is formed between the outer wall of the reactor shell (35) and the wall that limits the region (9) having a decreasing hydraulic diameter and the at least one gas discharge point (19) is situated on the annular channel (21), the ratio of the horizontal surface (39) of the annular channel (21) to the horizontal surface (41) which is enclosed by the reactor shell (35) being in the range of 0.3 to 5.

    HERSTELLUNG EINES WASSERABSORBIERENDEN HARZES UNTER EINMISCHEN EINES TEILCHENFÖRMIGEN ADDITIVS
    5.
    发明公开
    HERSTELLUNG EINES WASSERABSORBIERENDEN HARZES UNTER EINMISCHEN EINES TEILCHENFÖRMIGEN ADDITIVS 有权
    制备吸水树脂混合下一个颗粒添加剂

    公开(公告)号：EP1969017A2

    公开(公告)日：2008-09-17

    申请号：EP06830841.0

    申请日：2006-12-28

    Applicant: BASF SE

    Inventor： STUEVEN, Uwe ,  DANIEL, Thomas ,  FUNK, Rüdiger ,  WEISMANTEL, Matthias ,  VAN ESBROECK, Dominicus ,  POSSEMIERS, Karl ,  HILLEBRECHT, Annemarie

    IPC: C08F2/00 ,  C08F2/44

    CPC classification number: C08F2/44 ,  C08F220/06 ,  C08F222/1006

    Abstract: The invention relates to a method for producing a water-absorbing resin by polymerization of a reaction mixture comprising at least one hydrophilic monomer and optionally at least one cross-linker, in a reactor. According to said method, at least one first fraction of a particulate additive is admixed to the reaction mixture before the reaction mixture reaches a dwell time of 40 % of the total dwell time in the reactor, and at least one second fraction of a particulate additive is admixed when the reaction mixture reaches a dwell time of 45 % or more of the total dwell time in the reactor. The additive is selected from the group of water-adsorbing resin powders, fillers and mixtures thereof, the total solids content of the monomer and the additive being 30 to 60 % by weight, the amount of the additive being 5 to 50 % by weight, based on the monomer, and the weight ratio of the first fraction to the second fraction of the additive being 10:1 to 1:5. The resin powder is constituted of, e.g., recycled fines. Bot the residual monomer content, especially the residual cross-linker content, and the content in extractable substances of the water-absorbing resin are reduced by the described manner of admixture. A high percentage of additives can be incorporated without deteriorating the properties of the water-absorbing resin so obtained. The additives form a sufficiently strong compound with the resin without excessive dust formation when the resin is exposed to mechanical stress.

Patent Agency Ranking