Patent GB-567096-A (GB)
Title: Improvements in or relating to the adhesive bonding of surfaces or in or relating toadhesive compositions suitable for use therein
IPC: C09J125/10
Filed: 1943-01-15
Abstract: Surfaces are united by pressing together with a composition between them comprising (a) a copolymer of a major amount of butadiene and a minor amount of styrene, (b) a resinous material, intersoluble with the copolymer, in amount by volume at least 25 per cent, but below 125 per cent of the copolymer, and (c) inorganic filling material in amount by volume at least 40 per cent of that of the copolymer, but below 125 per cent.  The composition comprising a solvent also may be applied as a coating to one or both of the surfaces and they may be allowed to dry before pressing together.  The resinous material (b) is one which is capable of forming with the copolymer (e.g. by solvent or fusion methods) intimate mixtures which are capable of forming films from which the components do not separate; specified are natural resinous material, e.g. wood rosin, or a derivative thereof, e.g. lime hardened rosin or zinc rosinate, or synthetic resins of the kind obtained by condensing an aldehyde with a tert.-alkyl-substituted phenol, e.g. formaldehyde with p-tert.-butyl phenol.  Specified filling materials are zinc oxide, whiting and carbon black; where carbon black is used, it is preferred to use another filler and that the carbon black does not exceed 15 per cent by adhesive of the copolymer.  A preferred solvent is a mixture of toluol and petroleum spirit.  Dispersion of the filling material may be aided by the use of a dispersing agent, e.g. rosin oil, stearic acid.  Vulcanising ingredients may also be present, e.g. sulphur, together with an accelerator (mercaptobenzthiazole).  An illustrative composition comprises butadiene-styrene copolymer (thermally degraded), zinc oxide, carbon black, rosin oil, wood rosin, and equal volumes of toluol and petroleum spirit.ALSO:Surfaces are united by pressing together with a composition between them comprising (a) a copolymer of a major amount of butadiene and a minor amount of styrene, (b) a resinous material, intersoluble with the copolymer, in amount by volume at least 25 per cent, but below 125 per cent of the copolymer, and (c) inorganic filling material in amount by volume at least 40 per cent of that of the copolymer, but below 125 per cent. The composition comprising a solvent also may be applied as a coating to one or both of the surfaces and they may be allowed to dry before pressing together.  The resinous material (b) is one which is capable of forming with the copolymer (e.g. by solvent or fusion methods) intimate mixtures which are capable of forming films from which the components do not separate; specified are natural resinous material, e.g. wood rosin, or a derivative thereof, e.g. lime-hardened rosin or zinc rosinate, or synthetic resins of the kind obtained by condensing an aldehyde with a tert-alkyl-substituted phenol, e.g. formaldehyde with p-tert.-butyl phenol.  Specified filling materials are zinc oxide, whiting and carbon black; where carbon black is used, it is preferred to use another filler and that the carbon black does not exceed 15 per cent by volume of the copolymer.  A preferred solvent is a mixture of toluol and petroleum spirit.  Dispersion of the filling material may be aided by the use of a dispersing agent, e.g. rosin oil, stearic acid.  Vulcanising ingredients may also be present, e.g. sulphur, together with an accelerator (mercaptobenzthiazole).  An illustrative composition comprises butadiene-styrene copolymer (thermally degraded), zinc oxide, carbon black, rosin oil, wood rosin, and equal volumes of toluol and petroleum spirit.