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    • 9. 发明专利
    • GB1375509A
    • 1974-11-27
    • GB2012572
    • 1972-05-01
    • C08L9/02C08D9/08C08F1/92C08F37/18
    • 1375509 Polymer compositions; coagulating latices NIPPON ZEON CO Ltd 1 May 1972 [1 May 1971 5 Nov 1971] 20125/72 Heading C3P Oil-resistant polymer compositions, which are resistant to solvent crack when in contact with highly aromatic solvents, comprise (I) 5-50 wt. per cent of a copolymer containing 20-50 wt. per cent acrylonitrile units, 50-80 wt. per cent butadiene and/or isoprene units and 0À1- 10 wt. per cent α,#-ethylenically unsaturated carboxylic acid units (especially acrylic or methacrylic acids), said copolymer having a number average M.W. of 500-10,000 (exemplified copolymers being liquid), and (II) 95-50 wt. per cent of butadiene/acrylonitrile copolymer, the percentages of (I) and (II) being based on total (I) + (II). Exemplified compositions also contain carbon black, dioctyl phthalate, an amine antioxidant (in some cases) and conventional vulcanizing ingredients. The above compositions are desirably prepared by coagulating a latex of copolymer (I) in the presence of copolymer (II), or by coagulating mixed latices of copolymers (I) and (II), the coagulating agent being a mixture of (a) a metal salt, especially aluminium sulphate or calcium chloride, and (b) a polymer of an α,#- ethylenically unsaturated carboxylic acid or an ammonium salt of such a polymer, e.g. poly- (acrylic acid) or its ammonium salt. The coagulating agent may optionally contain (c) an acid, e.g. sulphuric acid. Examples are given of such coagulation processes. Example 1 describes the production of liquid acrylonitrile/butadiene (or isoprene)/acrylic (or methacrylic) acid copolymers of M.W. ranging from 1150-6010 by a conventional aqueous emulsion technique.