Patent GB-953415-A (GB)
Title: Method of effecting the adhesion of polyester materials to rubbers
Inventor: KIGANE KOJI
IPC: C08L67/00
Filed: 1961-10-26
Abstract: A method of effecting the adhesion of a material containing a high molecular weight polyester which may take the form of cords, cord-fabrics, textiles and films to rubber comprises applying to the material a layer of a liquor containing a compound having at least two identical groups, being ethylene urea or ethylene urethane groups, examples of which are given, and then heating the material at a temperature of 150-250  DEG C. to form an adherent coating thereon; applying to the coated material a layer of a second liquor comprising an aqueous dispersion of a phenol-formaldehyde resin in admixture with a latex and then heating the material at a temperature of 100-250  DEG C. to form a second adherent coating thereon; and then curing the rubber in contact with the so-treated material in a manner known per se. The liquors may be applied by brushing, immersion or spraying. The first treatment liquor may comprise an aqueous emulsion or dispersion, or a solution, emulsion or dispersion in an organic solvent, of a compound having at least two ethylene urea or ethylene urethane groups.  Examples of organic solvents are given. The first treatment liquor may further comprise an amino or quaternary ammonium compound which may be a primary, secondary or tertiary amine or polyamine, a quaternary ammonium hydroxide, or a urea, examples of which are given, which may be present in an amount corresponding to 0,05-4 equivalents of amino or quaternary ammonium groups to each equivalent of the functional groups of the effective compound contained in the first treatment liquor.  The first treatment liquor may also comprise a dispersing or emulsifying agent, examples of which are given.  The first treatment liquor may be an aqueous solution, dispersion or emulsion to which has been added a latex, or a solution, dispersion or emulsion in an organic solvent admixed with a solution of raw rubber in an organic solvent.  The term phenol includes phenol, resorcinol, catechol, or other phenols.  The second treatment liquor may comprise an aqueous dispersion of a resorcinol-formaldehyde resin in admixture with a latex.  The latex in the first and/or second treatment liquor may comprise a vinyl pyridine copolymer latex.  The latex in the second treatment liquor may further comprise a natural rubber latex.  After the first treatment liquor has been applied to the polyester material, the material may be heat treated, e.g. for 1-3 minutes, at a temperature of 180-230  DEG C.  The high molecular weight polyesters specified are polycyclohexane, 1,4,dimethylol terephthalate and polyethylane terephthalate.  The heat treatment may be carried out under a tension which allows the material to shrink.  The latex may be of natural rubber, polymers of isoprene, butadiene or chloroprene, or copolymers of butadiene with styrene or acrylonitrile, or vinyl chloride-vinyl acetate copolymer, into which the coated material is embedded to produce a tyre carcass. The textile may contain a polyvinyl alcohol size.ALSO:A method of effecting the adhesion of a material containing a high molecular weight polyester which may take the form of filaments, fibres, yarns, and strands, to rubber comprises applying to the material a layer of a liquor containing a compound having at least two identical groups, being ethylene urea or ethylene urethane groups, examples of which are given, and then heating the material at a temperature of 150 DEG  to 250 DEG C. to form an adherent coating thereon; applying to the coated material a layer of a second liquor comprising an aqueous dispersion of a phenol-formaldehyde resin in admixture with a latex and then heating the material at a temperature of 100 DEG  to 250 DEG C. to form a second adherent coating thereon; and then curing the rubber in contact with the so-treated material in a manner known per se. The first treatment liquor may comprise an aqueous emulsion or dispersion, or a solution, emulsion or dispersion in an organic solvent, of a compound having at least two ethylene urea or ethylene urethane groups.  Examples of organic solvents are given. The first treatment liquor may further comprise an amino or quaternary ammonium compound which may be a primary, secondary or tertiary amine or polyamine, a quaternary ammonium hydroxide, or a urea, examples of which are given, which may be present in an amount corresponding to 0. 05 to 4 equivalents of amino or quaternary ammonium groups to each equivalent of the functional groups of the effective compound contained in the first treatment liquor.  The first treatment liquor may also comprise a dispersing or emulsifying agent, examples of which are given.  The first treatment liquor may be an aqueous solution, dispersion or emulsion to which has been added a latex, or a solution, dispersion or emulsion in an organic solvent admixed with a solution of raw rubber in an organic solvent. The term phenol includes phenol, resorcinol, catechol, or other phenols.  The second treatment liquor may comprise an aqueous dispersion of a resorcinol-formaldehyde resin in admixture with a latex.  The latex in the first and/or second treatment liquor may comprise a vinyl pyridine copolymer latex.  The latex in the second treatment liquor may further comprise a natural rubber latex.  After the first treatment liquor has been applied to the polyester material, the material may be heat treated e.g. for 1 to 3 minutes, at a temperature of 180 DEG  to 230 DEG C.  The high molecular weight polyesters specified are polycyclohexane 1, 4, dimethylol terephthalate and polyethylane terephthalate.  The heat treatment may be carried out under a tension which allows the material to shrink. The latex may be of natural rubber, polymers of isoprene, butadiene or chloroprene, or copolymers of butadiene with styrene or acrylonitrile, or vinyl chloride-vinyl acetate copolymer, into which the coated material is embedded to produce a tyre carcass.  The textile may contain a polyvinyl alcohol size.