Bonding of Filamentary Materials of Synthetic Linear Polyesters to Rubber

摘要

1,154,339. Treating polyester fibres. CELANESE CORP. 8 Nov., 1966 [12 Nov., 1965], No. 49986/66. Heading D1P. Improved adhesion of synthetic linear polyester filamentary material to natural or synthetic rubber is obtained by applying to the filamentary material a halogenated aromatic hydrocarbon which is a di- or tri-halobenzene containing not more than two alkyl substituents in which any such substituents each contains 1-4 carbon atoms, before or at the same time as there is applied thereto an adhesive embedding the material in the rubber and vulcanising the product. The halogenated aromatic hydrocarbon which may be applied to the polyester fibrous material without dilution, as a solution in acetone, propanol or tetrachloroethane or as an aqueous suspension by dipping, brushing or spraying, may be a trichlorobenzene, tribromobenzene, trichlorotoluene, o- , m- or pdichloro or dibromobenzene, chlorobromobenzene, dichlorobromo toluene, dichlorotoluene or methylethyl dichlorobenzene. The halogenated aromatic hydrocarbon may be applied to the fibrous material at 10‹-150‹C and the material then partly or completely dried, e.g. at room temperature for several hours or at 100‹C for a few minutes. The treated material may be heat set at 150‹-245‹C for ¢-5 minutes. An aqueous adhesive composition comprising a resorcinol-formaldehyde resin precondensate together with isocyanates, blocked isocyanates or epoxy compounds and aqueous rubber latex dispersions, e.g. a butadienestyrene-vinyl pyridine copolymer and a styrene-butadiene copolymer, may be used. After treatment with the halogenated aromatic hydrocarbon and adhesive either separately or together the fibrous material may be dried and heated for 1-5 minutes at 60‹-250‹C if desired under tension. Suitable synthetic rubbers are those obtained by polymerising a conjugated C 4 -C 6 diolefine either alone or with styrene, methyl styrene or acrylonitrile or by polymerising chloroprene alone or with dienes or vinyl compounds, and elastomeric ethylenepropylene copolymers and terpolymers. The rubber may also contain sulphur, sulphur chloride, thiuram polysulphides, carbon black, pigments, anti-oxidants and antiscorch agents. The process may be used in the production of vehicle tyres and transmission and conveyor belts.