Patent GB-992637-A (GB)
Title: Polymer dispersions
IPC: C09D133/06
Filed: 1962-02-12
Abstract: Compositions comprise an anhydrous dispersion of an addition polymer and a dispersing agent in a complemental material in which the polymer is insoluble, and which comprises a liquid and/or a fusible solid which is either polymerizable as such or reactive with the addition polymer, the addition polymer being in the form of discrete particles having a size not exceeding 10 microns, and the complemental material being present in an amount which is at least 3% based on the combined weight of the complemental material and the addition polymer.  The dispersed polymer is preferably made by a process involving polymerizing monomeric material in an organic liquid in which the resulting polymer is insoluble and containing a dispersing agent made by grafting a part of the monomer charge on to a preformed polymeric material. After the addition of the complemental material, the more volatile organic liquid is removed by distillation, leaving the polymer dispersed in the complemental material.  Preferred complemental materials are polyepoxides, phenoplasts, ethylenic monomers and drying and semi-drying oils. Also present in the compositions may be pigments and plasticizers. The examples describe the preparation of dispersions of:  (1) a methyl methacrylate/ethyl acrylate copolymer in linseed oil, (2) a methyl methacrylate/ethyl acrylate copolymer in safflower oil, with the addition of titanium dioxide, (3) a methyl methacrylate/ethyl acrylate copolymer in linseed oil, with the addition of carbon black and Prussian blue, (4) a methyl methacrylate/ethyl acrylate/2-ethylhexyl acrylate copolymer in a mixture of dehydrated castor oil and chinawood or tung oil, with the addition of either a p-amylphenol-formaldehyde resin-forming condensate, or copal resin, (5) a methyl methacrylate/ethyl acrylate copolymer in soybean oil, with the addition of calcium carbonate and titanium dioxide, (6) a methyl methacrylate/ethyl acrylate/2-ethylhexyl acrylate copolymer in cottonseed oil, with the addition of titanium dioxide and zinc oxide, (7) a methyl methacrylate/ethyl acrylate/methacrylamide copolymer in an alkyd resin prepared from dehydrated castor oil, glycerol, pentaerythritol and phthalic anhydride, (8) a methyl methacrylate/ethyl acrylate/acrylonitrile copolymer in octyl methacrylate, (9) a methyl methacrylate/ethyl acrylate/acrylic acid copolymer in epoxidized polybutadiene, (10) a methyl methacrylate/ethyl acrylate copolymer in liquid polybutadiene and (11) a methyl methacrylate/ethyl acrylate copolymer in a mixture of vinyl toluene and a styrene-butadiene copolymer.  The resulting dispersions are used as coating, caulking, glazing and moulding applications, in the course of which the complemental material is caused to polymerize or to react with the dispersed polymer. Specifications 893,429 and 992,635 are referred to.ALSO:Surfaces of metal, wood, glass and patent leather are coated by applying thereto e.g. by casting or roller-coating, compositions comprising an anhydrous dispersion of an addition polymer and a dispersing agent in a complemental material in which the polymer is insoluble, and which comprises a liquid and/or a fusible solid which is either polymerizable as such, or is reactive with the addition polymer (see Division C3).  The examples describe: (1) coating glass, metal and redwood surfaces with a dispersion of a methyl methacrylate/ethyl acrylate copolymer in linseed oil, (2) coating wood with a dispersion of a copolymer as in (1) in safflower oil, containing titanium dioxide, (3) coating patent leather with a dispersion of a methyl methacrylate/ethyl acrylate copolymer in linseed oil, containing carbon black and Prussian blue, (7) coating steel and aluminium surfaces with a dispersion of a methyl methacrylate/ethyl acrylate/methacrylamide copolymer in an alkyd resin made from dehydrated castor oil, glycerol, pentaerythritol and phthalic anhydride, followed by heating at 350  DEG F., (9) coating steel with a dispersion of a methyl methacrylate/ethyl acrylate/acrylic acid copolymer in epoxidized polybutadiene, followed by heating at 350 DEG F., and (11) coating a steel plate with a dispersion of a methyl methacrylate/ethyl acrylate copolymer in a mixture of vinyl toluene and a styrene/butadiene copolymer, and polymerizing the coating by heating at 150  DEG C.  Specifications 893,429 and 992,635 are referred to.