| 摘要 |
1290707 Laminated products BOSTIK Ltd 6 Nov 1969 [7 Nov 1968] 54383/69 Addition to 1236043 Heading B5N [Also in Division B2] A surface of a body of synthetic polymeric material, the molecules of which have at least one hydrogen atom in a repeating unit of a carbon-carbon chain of the polymer molecule, is prepared for adhesive bonding by applying photo-sensitizer material and organic isocyanate material to a surface of the polymer and then irradiating the surface with ultra-violet radiation whilst photo-sensitizer material and organic isocyanate material are present on the surface. The polymers which may be treated are those having a critical surface tension of wetting of 35 dynes per centimetre or less as determined by contact angle measurements, e.g. polyethylene, polypropylene, copolymers of ethylene and propylene alone or with a minor amount of a non-conjugated diene, e.g. hexadiene, and fluorine-containing polymer such as polyvinyl fluoride and polyvinylidene fluoride. The isocyanate may be triphenylmethane triisocyanate, polyarylene polyisocyanate, tolylene diisocyanate, methylene bis - 4 - phenyl isocvanate, phenyl isocyanate applied in organic solvent solution. The photo-sensitizers may be halogenated hydrocarbons, e.g. methylene chloride, trichloroethylene, chloroform, ketones, e.g. benzophenone, acetophenone, benzoin, 2-acetonaphthone, acenaphthene and fluorene. It is stated that the photo-sensitizers interact with the resin substrate producing groups which will react with isocyanate groups. The isocyanate and photo-sensitizer may be applied separately, or together, e.g. in solution in a common solvent or as a solution of the isocyanate in the photosensitizer. The isocyanate and photosensitizer may be included in an adhesive composition or a photo-sensitized material may be admixed with an adhesive which includes a compound, e.g. a polyurethane having active isocyanate groups. The adhesive may be linear polyether glycol urethanes, linear polyester glycol urethanes, adhesives based on natural rubber, synthetic rubber such as neoprene and butadiene-acrylonitrile copolymers especially adhesives containing heat advancing phenolic resins and magnesium reacted heat advancing alkyl constituted phenolic resins, curing type epoxy resins and resinous polyesters. The adhesive composition must be applied in liquid form when the photosensitizer and -free isocyanate or an adhesive component providing -NCO groups are included, but otherwise may be applied as solution, preformed film, powder, melt. The examples relate to the bonding together of two strips of polyethylene, polypropylene, ethylenepropylene - diene terpolymer, ethylene - propylene-diene terpolymer coated polyester fibre fabric, or vinyl fluoride polymer and the bonding of a rubber heel to a polyethylene heel rise element subjected to roughening. |
