中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

15 records (took 0.018 seconds)

    Sinterable, finely-divided PVC moulding material - by suspension polymerisation of vinyl chloride, with addn. of emulsion-PVC latex before sepn. from aq. phase
    2.
    发明专利
    Sinterable, finely-divided PVC moulding material - by suspension polymerisation of vinyl chloride, with addn. of emulsion-PVC latex before sepn. from aq. phase 未知

    公开(公告)号：DE3921299A1

    公开(公告)日：1991-01-03

    申请号：DE3921299

    申请日：1989-06-29

    Applicant: HOECHST AG

    Inventor： BOETSCH FRANZ DR ,  ENGELMANN MANFRED DR ,  KRAUS HELMUT DR ,  PLEWAN OTTO

    IPC: C08F2/18 ,  C08F2/44 ,  C08F14/06 ,  C08F259/04 ,  C08F291/00

    Abstract: A process is claimed for the prodn. of a sinterable, finely-divided moulding material (I) based on PVC with K value 55-90, density 400-700 g/dm3 and mean particle size 10-50 microns with 99-30 wt.% below 33 microns, 1-60 wt.% from 33-63 microns, 0-9 wt.% from 63-125 microns and 0-1 wt.% above 125 microns; the process involves homopolymerisation of vinyl chloride (VC), copolymerisation of VC with 0.5-25 wt.% other comonomers or graft copolymerisation of VC with 0.1-5 wt.% of a polymer, in acid aq. suspension in the presence of oil-soluble radical activator(s), suspension stabiliser(s), emulsifier(s) (3-16C alkyl-arylsulphonic acids, 8-16C alkylsulphonic acids or 8-16C monoalkyl sulphates) and possibly other additives; the novelty is that, after at least 70 wt.% of the VC is polymerised but before sepn. of the aq. phase, a latex obtd. by emulsion or microsuspension polymerisation of VC and contg. 0.5-5 wt.% emulsifier(s) is added in an amt. such that the mixt. contains 0.5-8 pts.wt. PVC from the latex w.r.t. 100 pts. wt. PVC from the suspension polymerisation, then the polymer is coagulated, the aq. phase is sepd. and the polymer mixt. is dried. USE/ADVANTAGE - (I) is useful for the prodn. of sintered mouldings, esp. separator plates for electrical cells (claimed). The orocess enables the prodn. of (I) which can be readily processed at low relative humidity without adverse effects on the mechanical properties of the separator plates (contrast prior-art processes, which also use comparatively expensive additives and involve tedious post-treatment with special equipment).

    3.
    发明专利
    未知

    公开(公告)号：DE3575435D1

    公开(公告)日：1990-02-22

    申请号：DE3575435

    申请日：1985-07-11

    Applicant: HOECHST AG

    Inventor： ENGELMANN MANFRED DR ,  KRAUS HELMUT DR ,  PLEWAN OTTO

    IPC: C08K5/00 ,  C08K5/19 ,  C08L27/06 ,  H01B3/44 ,  H01M2/16

    Abstract: A molding composition which is essentially composed of a mixture of at least two polymers based on vinyl chloride and at least one water-soluble surfactant is described. One of the polymers is a sinterable vinyl chloride/alkyl acrylate copolymer which can contain, in addition, polymerized units of vinyl acetate and ethylene. At least one further polymer is a vinyl chloride polymer which can contain up to 5% by weight of polymerized units of vinyl acetate and ethylene. The molding composition is suitable for the production of sintered, porous, flexible moldings, in particular separator compartments for electric cells.

    6.
    发明专利
    未知

    公开(公告)号：DE3426929A1

    公开(公告)日：1986-01-23

    申请号：DE3426929

    申请日：1984-07-21

    Applicant: HOECHST AG

    Inventor： ENGELMANN MANFRED DR ,  KRAUS HELMUT DR ,  PLEWAN OTTO

    IPC: C08K5/00 ,  C08K5/19 ,  C08L27/06 ,  H01B3/44 ,  H01M2/16 ,  C08L33/08 ,  C08L31/04 ,  C08L23/08 ,  C08L51/06 ,  H01M2/14 ,  C25B13/04

    Abstract: A molding composition which is essentially composed of a mixture of at least two polymers based on vinyl chloride and at least one water-soluble surfactant is described. One of the polymers is a sinterable vinyl chloride/alkyl acrylate copolymer which can contain, in addition, polymerized units of vinyl acetate and ethylene. At least one further polymer is a vinyl chloride polymer which can contain up to 5% by weight of polymerized units of vinyl acetate and ethylene. The molding composition is suitable for the production of sintered, porous, flexible moldings, in particular separator compartments for electric cells.

    7.
    发明专利
    未知

    公开(公告)号：DE3334667A1

    公开(公告)日：1985-04-11

    申请号：DE3334667

    申请日：1983-09-24

    Applicant: HOECHST AG

    Inventor： ENGELMANN MANFRED DR ,  PLEWAN OTTO ,  KRAUS HELMUT DR ,  MIELKE INGOLF DR

    IPC: C08F2/16 ,  C08F14/06 ,  C08F291/00 ,  C08K3/30 ,  C08K3/32 ,  H01M2/16 ,  C08F6/24

    Abstract: Prodn. of a sinterable, fine-particle PVC moulding compsn. by homo-, CO- or graft suspension polymerisation of VC monomer in presence of an oil-soluble free-radical initiator, a suspension stabiliser, emulsifier and opt. other polymerisation aids. After ending the polymerisation and sepg. the bulk of the polymer a non-ionic or amphoteric wetting agent is added before drying. The process novelty claimed is the addn. at this stage of an aq. soln. of a non- surface active acid with an acid dissociation constant up to 3 pKs at 20 deg.C.. Pref. 0.01-5 wt.% on dry polymer of a phosphorus or sulphur contg. acid, esp. P contg. acid, with low volatility at 120 deg.C. is added after sepg. the greater part of the polymer from the aq. phase after polymerisation has ended. The polymer has a K-value =55-90, bulk density =400-700g/cdm, and a particle distribution of 99-30 wt.% less than 33 microns, 1-60 wt.% 33-63 microns, 0-9 wt.% 63-125 microns and 0.1 wt.% greater than 125 microns. Sintered shaped articles esp. separator plates for electric cells are claimed.

Patent Agency Ranking