中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

11 records (took 0.02 seconds)

    2.
    发明专利
    未知

    公开(公告)号：DE1116404B

    公开(公告)日：1961-11-02

    申请号：DEB0052032

    申请日：1959-02-07

    Applicant: BASF AG

    Inventor： GOEBEL DR SIEBERT ,  HAEBERLE DR MANFRED ,  ZACHER DR WIELAND ,  SCHMIDT-THOMEE DR GEORG

    IPC: C08F10/00

    Abstract: In a process for the purification of polyethylene, obtained by polymerization at pressures above 500 excess atmospheres, by freeing it from gaseous and volatile non-gaseous constituents including unreacted monomer, in which the polyethylene, after reaction using a catalyst in a reaction vessel, is led therefrom first into a separator which is at a lower pressure than the reaction pressure, preferably less than 5 excess atmospheres and thence in finely divided form with a large surface area into a degasification chamber in which the polyethylene is subjected to vacuum treatment and thence to an extruder, provision being made to exclude air over the whole path of the polyethylene from the reaction vessel to the extruder, steam is introduced into the separator at a temperature of about 150 DEG C. and is discharged from the separator together with a part of the gaseous and volatile constituents. Further steam, water or an organic solvent may be added to the polyethylene after it leaves the separator and before it enters the degasification chamber. Polymers miscible with polyethylene may be added thereto in the separator and further processed therewith. Apparatus suitable for carrying out the process of the invention is described and illustrated.

    4.
    发明专利
    未知

    公开(公告)号：DE1220608B

    公开(公告)日：1966-07-07

    申请号：DEB0059393

    申请日：1960-09-16

    Applicant: BASF AG

    Inventor： SCHMIDT-THOMEE DR GEORG ,  EILBRACHT DR HANS ,  KINKEL DR KLAUS ,  TRIESCHMANN DR HANS-GEORG ,  URBAN DR FRIEDRICH ,  ZOCHE DR GUENTHER

    IPC: C08F10/00

    Abstract: Polyethylene of density more than 0,924 and suitable for the production of film is produced by polymerizing ethylene in a tubular system in the presence of hydrogen as chain transfer agent and oxygen as catalyst, the polymerization being in the absence of solvents or diluents, at pressures between 2000 and 4000 atmospheres and at temperatures between 200 DEG and 300 DEG C., and the ethylene containing 0,05 to 2% of hydrogen and 5 to 20 p.p.m. of oxygen.

Patent Agency Ranking