Patent GB-814201-A (GB)
Title: Adhesion promoters
IPC: C09D185/00
Filed: 1956-02-20
Abstract: A substantially non-aqueous fluid coatingcomposition which on hydrolysis gives rise to an adhesion-promoting film comprises a hydrolysable alcoholate of a metal having a valence of 3 to 5, each hydrolysable organic radical having from 1 to 8 carbon atoms and, in place of the hydrolysis modifiers used in the parent Specification, one or more normally solid chlorinated hydrocarbons.  The latter may be, e.g. chloronaphthalene, dichlorobenzene, chlorinated rubber, polyvinylchloride, polyvinylidene chloride, chlorinated polyethylene or a chlorinated paraffin.  The composition may be applied to a surface and exposed to an atmosphere containing water-vapour at temperatures from room temperature to 300 DEG  C.  Polymeric films may be so coated and used to form laminates, e.g. polyethylene terephthalate film may be coated and laminated with sheet polyethylene, aluminium foil, wall paper or wrapping paper, or coated with a partially fluid-laminating substance such as a solution of polyvinyl butyral, rubber cement or polyvinyl alcohol. Terneplate may be coated with the compositions of the invention and laminated to sheet polyethylene, or sheets of aluminium coated paper may be coated on the paper side and laminated with an interposed layer of a foamed plastic such as foamed polystyrene, or such plastic may be similarly laminated to glass, wood, metal foil, polyethylene terephthalate or polymethyl methacrylate A film of polyethylene terephthalate may be coated with the composition of the invention which is cured and then flow-coated with a thermoplastic epoxy resin, or the resin may be hot-pressed between two such treated films.  The resin may contain glass fibres.  Kraft paper may be coated on both sides with the compositions and cured, and may then be laminated on one side, by rolling or casting, to a film of polyethylene, the resulting laminate rolled on a mandrel and cured at 120 DEG  C. to form a tube. Electronic equipment, e.g. condensers, may be formed by laminating aluminium or other metal sheets with dielectrics such as polyethylene, polystyrene and polyethylene terephthalate.  In examples: (1) sheets of polyethylene terephthalate and of aluminium foil are treated with a solution in xylol of tetraisopropyl titanate and neoprene, and the titanate hydrolysed by air curing; the treated surfaces are then coated with rubber cement, dried until tacky, and pressed together to form a laminate; (2) an aged alkyd enamel paint surface is coated with an isopropanol solution of paradichlorobenzene and tetraisopropyl titanate, the coating allowed to hydrolyse, and a fresh coating of alkyd enamel paint applied thereover; (3) aluminium panels are treated with a solution of tetraisopropyl titanate and 1,1,1,2,3-pentachloropropane in n-hexane, and, after drying overnight at 50 to 70 per cent relative humidity, coated with vinyl chloride-vinyl acetate co-polymer paints; (4) polyethylene terephthalate film is coated with a solution of tetrabutyl titanate and chlorinated rubber in xylol, the film cured at 130 DEG  C., rubber cement is applied to the treated surface and to a rubber floor tile and, when the coatings are tacky, the surfaces are pressed together.ALSO:A substantially non-aqueous fluid coatingcomposition which on hydrolysis gives rise to an adhesion-promoting film comprises an hydrolysable alcoholate of a metal having a valence of 3 to 5, each hydrolysable organic radical having from 1 to 8 carbon atoms, and, in place of the hydrolysis modifiers of the parent Specification, one or more normally solid chlorinated hydrocarbons. The latter may be, e.g., polyvinyl chloride, polyvinylidene chloride or chlorinated polyethylene.  In an example, a xylol solution of tetraisopropyl titanate and neoprene is used.