Patent GB-1276528-A (GB)
Title: Preparation of finely divided polymers
IPC: C08F257/02
Filed: 1969-11-25
Abstract: 1276528 Polymerization process for finelydivided cross-linked polymers TOKUYAMA SODA KK 25 Nov 1969 [25 Nov 1968] 57721/69 Heading C3G A finely divided cross-linked polymer of particle size less than 1 Á is prepared by polymerizing (1) a first monomer component consisting of (i) one or more radical-polymerizable monoethylenically unsaturated monomers (a) containing an epoxy, acid anhydride, carboxyl, carboalkoxy, carbamoyl, acyloxy or nitrogencontaining heterocyclic group or (ii) one or more of monomers (a) and one or more of monomers (b) each of which is a monoethylenically unsaturated aromatic compound, acrylonitrile, vinyl chloride or n-butene and (2) 0À5 to 30%, based on the weight of monomer component (1) of a second monomer component consisting of one or more unconjugated diethylenically unsaturated monomers, the polymerization being carried out in an organic solvent which dissolves components (1) and (2) but not the cross-linked polymer produced and not the linear polymer obtained by polymerizing component (1) in the absence of component (2) and which has dissolved therein a linear polymer which is a polymer of a monoethylenically unsaturated hydrocarbon of formula where R 1  is H, a C 1-4  alkyl or phenyl and R 2  is H or a C 1-4  alkyl and which is soluble in n-heptane, a polyalkylene oxide or a vinyl chloride polymer and which is dissolved in the organic solvent in an amount of 10 to 500% based on the weight of monomer components (1) and (2). Examples are given in which benzoyl peroxide is used as catalyst for the copolymerization of divinyl benzene with (I) glycidyl methacrylate, vinyl acetate, a mixture of maleic anhydride and styrene or of 2-methyl-5-vinyl pyridine and acrylonitrile in n-heptane containing ethylene-propylene copolymer, the resulting copolymer being blended with polypropylene, (II) maleic anhydride and styrene in benzene containing polypropylene, the resulting copolymer being blended with polypropylene, polyvinyl chloride, polystyrene or polymethyl methacrylate (III) 2- methyl-5-vinyl pyridine and acrylonitrile in benzene containing polyethylene, the resulting copolymer being blended with polyethylene, (IV) maleic anhydride and styrene in benzene containing polypropylene oxide, (V) glycidyl methacrylate and acrylonitrile in n-heptane containing polypropylene oxide, the resulting copolymer being blended with polypropylene oxide, (VI) methyl methacrylate and acrylonitrile in dioxane containing polyvinyl chloride, the resulting copolymer being mixed with dioctyl terephthalate and polyvinyl chloride, (VII) 4- vinyl pyridine and methyl acrylate in cyclohexane containing polypropylene, the resulting copolymer being blended with polypropylene, (VIII) glycidyl methacrylate in heptane containing isobutene/butene- 1 copolymer, the resulting copolymer being blended with polypropylene, (IX) maleic anhydride and styrene in benzene containing polybutene, the resulting copolymer being blended with polypropylene, (X) glycidyl methacrylate in n-heptane containing ethylenepropylene copolymer, the resulting copolymer being blended with polypropylene, (XI) glycidyl acrylate in n-heptane containing polyoxyethylene alkyl ether and polyethylene, the resulting copolymer being blended with polypropylene, (XII) 1-methyl-2-vinyl imidazole and methyl methacrylate in n-heptane containing polyethylene, (XIII) maleic anhydride and styrene in benzene containing polypropylene, (XIV) glycidyl methacrylate in n-heptane containing ethylene-propylene copolymer, the resulting copolymer being blended with polypropylene and antioxidants, filaments spun from the blend being dyed, (XV) glycidyl methacrylate in kerosene containing polypropylene or in ligroin containing ethylene-propylene copolymer, the resulting copolymer being blended with polypropylene, (XVI) acrylamide and styrene in heptane/isopropanol containing polypropylene oxide or (XVII) acrylic acid and methyl methacylate in kerosene containing ethylene-vinyl acetate copolymer. In other examples, glycidyl methacrylate and divinyl benzene are copolymerized in n-heptane containing ethylenepropylene copolymer, ultra-violet radiation being used as initiator and maleic anhydride, styrene and divinyl benzene are copolymerized in benzene containing polyoxyethylene alkyl ether and polyethylene using azobisisobutyronitrile as catalyst, the resulting copolymer being blended with polypropylene. In some cases, films are produced from the copolymer blends and dyed.