Patent GB-802620-A (GB)
Title: Improvements in or relating to the production of coatings
IPC: B01J19/08
Filed: 1957-05-16
Abstract: Inorganic metal salts or metal oxides are chemically bonded to the surface of a shaped organic polymer, e.g. fibres, fabrics, extruded tubing, tapes, films, beading, moulded shapes, granules, powders, and wire covering, by a process comprising the following steps in either order : (i) applying a coating of at least 2x10-5g./cm.2 of the inorganic metal compound which is essentially free of organic material, to the surface, and (ii) subjecting the said shaped organic polymer to ionizing radiation of at least 0.1 million electron volts for at least 0.01 watt-sec./cm.2.  The polymer may have a molecular weight in excess of 500, such as hydrocarbon polymers, e.g. polyethylene, polystyrene, polybutadiene, rubber, polyisobutylene, and butadiene-styrene copolymers; halogenated hydrocarbon polymers, e.g. polyvinyl chloride and fluoride, polyvinylidene chloride, polychloroprene and polytetrafluoroethylene; ester-containing polymers, e.g. polyvinyl acetate, polymethyl methacrylate and polyethylene terephthalate; hydroxyl containing polymers, e.g. polyvinyl alcohol; cellulose, e.g. regenerated cellulose; ether-containing polymers, e.g. polytetrahydrofuran, polyformaldehyde and dioxolane polymers; condensation polymers, e.g. phenol-formaldehyde, urea-formaldehyde, triazine-formaldehyde; polyamides, e.g. nylon, polyhexamethylene-adipamide, and polyimides; polyacrylonitrile, polyvinyl acetals, and copolymers of two or more of these compounds.  The inorganic metal compound may be an oxidizing salt or a salt or oxide which forms an aqueous solution or suspension having a pH of 5 to 9, and may be applied by dipping, brushing or spraying in the form of an aqueous solution, suspension or paste which may include a trace of a synthetic detergent, e.g. octylphenyl polyglycol ether, or may be applied by sublimation, flame spraying, or by coating from a suspension in an organic solvent.  Specified inorganic compounds are fluorides, chlorides, bromides, iodides, nitrates, sulphates, sulphides, silicates, polymolybdates, borates, chlorates, carbonates, phosphates, manganates, chromates and oxides of sodium, potassium, magnesium, calcium, aluminium, titanium, vanadium, chromium, molybdenum, manganese, iron, cobalt, nickel, copper, silver, gold, zinc, cadmium, mercury, tin, lead, antimony and bismuth.ALSO:Inorganic metal salts or metal oxides are chemically bonded to the surface of a shaped organic polymer e.g. fibres, fabrics, extruded tubing, tapes, films, beading, moulded shapes, granules, powders, and wire covering, by a process comprising the following steps in either order-(i) applyinga coating of at least 2x10-5g/cm2 of the inorganic metal compound, which is essentially free of organic material, to the surface by sublimation, and (ii) subjecting the said shaped organic polymer to ionizing radiation of at least 0.1 million electron volts for at least 0.01 watt-sec/cm2. The polymer may have a molecular weight in excess of 500, such as hydrocarbon polymers e.g. polyethylene, polystyrene, polybutadiene, rubber, polyisobutylene, and butadiene-styrene copolymers: halogenated hydrocarbon polymers e.g. polyvinyl chloride and fluoride, polyvinylidene chloride, polychloroprene and polytetrafluoroethylene; ester - containing polymers e.g. polyvinyl acetate, polymethyl methacrylate and polyethylene teraphthalates; hydroxyl containing polymers e.g. polyvinyl alcohol; cellulose e.g. regenerated cellulose; ether-containing polymers e.g. polytetrahydrofuran, polyformaldehyde and dioxolane polymers; condensation polymers e.g. phenol-formaldehyde; urea formaldehyde, triazine-formaldehyde; polyamides e.g. nylon, polyhexamethylene-adipamide, and polyimides; polyacrylonitrile, polyvinyl acetals, and copolymers of two or more of these compounds. Specified inorganic compounds are fluorides, chlorides, bromides, iodides, nitrates, sulphates, sulphides, silicates, polymolybdates, borates, chlorates, carbonates, phosphates, manganates, chromates and oxides of sodium, potassium, magnesium, calcium, aluminium, titanium, vanadium, chomium, molybdenum, manganese, iron, cobalt, nickel, copper, silver, gold, zinc, cadmium, mercury, tin, lead antimony, and bismuth.