C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 20/44 (2006.01) B01D 71/42 (2006.01) B01J 20/26 (2006.01) C08F 2/12 (2006.01) C08F 20/42 (2006.01) C08L 101/00 (2006.01) C09D 5/44 (2006.01) C09D 7/00 (2006.01) C09D 133/20 (2006.01) D01F 6/54 (2006.01) C08L 33/20 (2006.01)
Patent
CA 2135592
Abstract Process for preparing finely divided polyacrylonitrile The invention relates to a process for preparing finely divided homopolymers or copolymers containing at least 50 % by weight of recurring acrylonitrile and/or meth- acrylonitrile units (based on the monomers used), which comprises: a) dissolving and/or suspending and/or emulsifying and/or dispersing the monomers in one or more liquids which are inert under the reaction condi- tions, where b) the sum of the monomer concentrations at the begin- ning and during the polymerization is less than 10 % by weight, c) high shear forces acting on the polymerization mixture prior to and during the polymerization to that the resulting homopolymer or copolymer par- ticles have a D50 % value of less than 10 µm and d) carrying out the polymerization in a known manner by addition of a polymerization initiator. The finely divided polyacrylonitrlle is suitable, for example, as pigmenting agent and organic filler and as pigment substitute in electrophoretic surface coatings of automobile or industrial surface coatings, as matting agent and/or colorable pigment in surface coatings, plastics, fibers, films, paper and cardboard, as adsorbent for gases and liquids, as raw material for the production of carbon microbeads as filler for liquid chromatography or ion exchange columns, as reinforcing material and/or filler for polymers and as raw material for the production of fibers, films and membranes.
Holzinger Ulrich
Walkenhorst Wilfried
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Hoeschst Aktiengesellschaft
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