中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

24 records (took 0.028 seconds)

    Process for the bulk polymerisation of vinyl chloride
    2.
    发明专利
    Process for the bulk polymerisation of vinyl chloride 未知

    公开(公告)号：DE3341521A1

    公开(公告)日：1985-05-30

    申请号：DE3341521

    申请日：1983-11-17

    Applicant: HOECHST AG

    Inventor： KASTNER PAUL DR ,  MIELKE INGOLF DR ,  STREITBERGER HORST

    IPC: C08F2/02 ,  C08F14/06 ,  C08F6/10

    Abstract: A process is described for the two-step bulk polymerisation of vinyl chloride. When the polymerisation is complete, residual monomeric vinyl chloride is removed by heat treatment, so that the treated polymer only contains at most 0.0001% by weight, based on the polymer, of residual vinyl chloride. Before, during or after the polymerisation, from 0.01 to 2% by weight, based on the monomer employed, of at least one of the following compounds are added to the polymerisation mixture: glycerol, diglycerol, triglycerol, products of the reaction thereof with from 1 to 10 molecules of ethylene oxide or propylene oxide, and polyglycerol, so long as at least 3% by weight of monomeric vinyl chloride are still present at the polymerisation mixture. The novel process gives a vinyl chloride or copolymer which can be employed universally in all common processing recipes and gives an acceptable colour of the produced article even under hard processing conditions.

    Polyvinyl chloride with low monomer content - produced by suspension polymerisation with partially hydrolysed polyvinyl acetate and methyl hydroxybutyl cellulose as suspension agents
    4.
    发明专利
    Polyvinyl chloride with low monomer content - produced by suspension polymerisation with partially hydrolysed polyvinyl acetate and methyl hydroxybutyl cellulose as suspension agents 未知

    公开(公告)号：DE2621742A1

    公开(公告)日：1977-12-08

    申请号：DE2621742

    申请日：1976-05-15

    Applicant: HOECHST AG

    Inventor： KLIPPERT HEINZ DR ,  MIELKE INGOLF DR ,  RUCHLAK KASIMIR DR

    IPC: C08F2/20 ,  C08F14/06

    Abstract: (Co)polymers of graft polymers of vinyl chloride are prepd. in aq. suspension, in presence of oil-sol. radical catalysts using as suspension agent polyvinyl acetate which is 42-54 % hydrolysed, and methyl hydroxybutyl cellulose with viscosity as a 2% aq. soln. of 0.02-60 (0.2-40) esp. 2-20 /Past at 20 degrees C. Vinyl chloride can be copolymerised with olefins, vinyl esters, unsatd. acids or their esters or anhydrides, acrylonitrile or styrene, graft comonomers include dienes, olefins, unsatd. acids or esters, vinyl esters, or vinylidene chloride. The polymer contains is not 50 (is not 80) esp. is not 90 wt. % vinyl chloride. Polymerisation is at 10-90 degrees C (30-80 degrees C) esp 45-75 degrees C. The methyl hydroxybuty cellulose has methoxy content of 17-33 wt. % and hydroxybutyl content of 2-13 %. The partially hydrolysed polyvinyl acetate has viscosity 0.0008-0.008 Pas as a 5% soln. in methanol at 20 degrees C. The ratio of hydrolysed polyvinyl acetate:cellulose ether is 9:1-1:9 (7:3-3:7). The total amt. of suspending agent is 2-0.005 (0.8-0.04) wt.% w.r.t. monomer(s). Minor amts. of other suspending agents may be present. The amt. of catalyst is 0.001-3 (0.01-0.3) wt % w.r.t. monomer(s). Emulsifiers may also be added in amt of 0.01-5 wt. % w.r.t. monomer(s). PVC with low residual monomer content and 3% (O%) of grains of size >250 mu can be obtd.

    7.
    发明专利
    未知

    公开(公告)号：DE3942316A1

    公开(公告)日：1991-06-27

    申请号：DE3942316

    申请日：1989-12-21

    Applicant: HOECHST AG

    Inventor： PAUL NORBERT ,  HUBER RUDOLF ,  MIELKE INGOLF DR

    IPC: C07B37/02 ,  C07C17/278 ,  C08F2/00 ,  C08F2/38

    Abstract: A process for continuous telomerization is described, in which at least one telogenic compound and at least one taxogenic compound are reacted at from 40 DEG to 150 DEG C. under a pressure of from 0.1 to 3 MPa in the presence of at least one catalyst in an elongate cylindrical reaction space. After it has left the reaction space, the reaction mixture is separated, for example by distillation, the desired higher-molecular telomers are discharged as the bottom product, and the undesired low-molecular telomerization products are stripped off over the top, condensed and recycled into the process in a first circulation. In a second circulation, a part of the reaction mixture is taken off towards the end of the reaction space and reintroduced into the initial part of the reaction space. This allows an improved space-time yield and a better selection of defined product cuts.

    Process for the preparation of dry vinyl chloride suspension polymers
    8.
    发明专利
    Process for the preparation of dry vinyl chloride suspension polymers 未知

    公开(公告)号：DE3505238A1

    公开(公告)日：1986-08-21

    申请号：DE3505238

    申请日：1985-02-15

    Applicant: HOECHST AG

    Inventor： MIELKE INGOLF DR

    IPC: C08F2/20 ,  C08F6/00 ,  C08F14/06 ,  C08F6/24

    Abstract: A process is described for the preparation of dry vinyl chloride polymers in which the polymerisation is carried out in aqueous suspension with addition of a water-soluble alkaline compound when the vinyl chloride conversion has reached from 10 to 70 % by weight, based on the vinyl chloride employed. After the residual monomers have been removed, the majority of the water has been decanted off and after conventional brief drying in an air-lift dryer, subsequent drying is carried out in a warmed stream of gas at from 35 to 90 DEG C for from 5 to 45 minutes. The extended subsequent drying lasting from 1 to 3 hours which is otherwise conventional is thus unnecessary.

Patent Agency Ranking