Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
  • C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2321/00—Characterised by the use of unspecified rubbers

Definitions

• the adhesives hitherto employed have generally been of a resinous character but these are not wholly satisfactory as individual resins have limitations in certain directions; for example, in some cases the resin in or on the rayon yarns may cause difliculties in the handling of the yarns preparatory to the production of tires.
• the object of the present invention is to pro-- vide an improved process for bonding textile yarns to rubber.
• a process for the production of a composite article comprising vulcanised rubber bonded to textile yarns includes the step of vulcanising rubber in contact with yarns which have been impregnated with a compound of a metal the sulphide of which is insoluble in water.
• Suitable metals are zinc, cadmium, mercury, copper, nickel and iron, preferred compounds of these metals are the hydroxides, carbonates and acetates.
• the metallic compounds may be applied to the yarns, or to such warns twisted into cords as an aqueous suspension or solution.
• a water-soluble compound such as cadmium acetate
• it is suilicient to pass the 'yarn through an aqueous solution of the compound to obtain the desired impregnation.
• the yarn may be impregnated with a dispersion of the compound, preferably freshly-precipitated.
• a waterinsoluble compound may be deposited in situ in the yarns by passing the yarns first through an aqueous solution of a metal compound such as the sulphate and then through a bath of a compound such as sodium carbonate, which reacts with the water-soluble metal compound to precipitate the desired metallic compound in the yarn.
• a metal compound such as the sulphate
• a compound such as sodium carbonate
• a suitable proportion of the metallic compound is from 0.1 to 5 per cent, preferably from 0.5 to 1 per cent of the weight of the yarn.
• the invention is particularly applicable to viscose rayon yarns but can be applied to other rayon yarns, for example, those of stretched and saponified cellulose acetate. It is also applicable to articles such as conveyor belting and V driving-belts. It is also applicable to tires and similar articles made from synthetic as well as natural rubber products, such as for example, the synthetic rubbers obtained by polymerising butadiene with other polymerisaible compounds such as styrene or acrylonitrile.
• the process of the invention is of particular advantage in view of the high increase in the strength of the bond; another important advantage is that it enables the yarn to be treated before it is made into cords and also simplifies the handling of the yarn.
• the metallic compound in the yarn is converted into the sulphide by reaction with sulphur present in the rubber.
• Example 1 Viscose rayon tire yarn was passed through a l per cent aqueous zinc sulphate solution, hydroextracted, passed through a 0.2 per cent aqueous sodium carbonate solution to form zinc carbonate in situ in the yarn, hydroextracted once more, dried and then used for the construction of tire cords.
• the dried yam contained about 0.65 per cent of zinc carbonate.
• a number of 10 inch lengths of each type of cord are laid lengthwise on the surface of a slab of an unvulcanised rubber composition measuring 10 inches by 3 inches by M; inch and gently pressed by hand into the rubber.
• the composition of the rubber stock is as 'follows, the parts being by weight:
• the surface with the cords therein is now covered by a sheet of regenerated cellulose while the other surface is covered with a canvas sheet which is in turn covered by a sheet of regenerated cellulose.
• the whole assembly is now placed in a platen press and vulcanised at 30 lb. per square inch steam pressure for 60 minutes.
• the rubber slab is removed from the press and the sheets of regenerated cellulose stripped off giving a rubber slab having the cords buried therein with the upper surfaces flush with the surface of the rubber.
• the canvas backing serves to render the slab inextensible while carrying out the adhesion tests.
• One end of each cord is now stripped out for about one inch and pulled in a direction along the surface of the rubber. the cord being bent back through an angle of 180 during the test. The pull required to separate the rubber and the cord is determined.
• Example 2 Example 1 was repeated but with -the single exception that a 1 per cent aqueous nickel sulphate solution was used in place of the zinc sulphate bath.
• the adhesion to rubber of the cords obtained was of the same order as that obtained with the cords produced in Example 1.
• Example 3 4 Example 4 viscose rayon tire yarn was passed through a 1 per cent aqueous cadmium acetate solution, hydroextracted, dried and used for the construction of tire cords. The cords contained approximately 1 per cent of cadmium acetate.
• a process for the production of a composite article comprising vulcanized rubber bonded to yarns of regenerated cellulose which includes the steps of impregnating the said yarn with a compound chosen from the group consisting of the hydroxides, carbonates and acetates of a metal chosen from the group consisting of zinc, cadmium, mercury and nickel, placing the impregnated yarns in contact with unvulcanized rubber and then vulcanizing the rubber so that the yarns are bonded to the vulcanized rubber.
• a process for the production of a composite article comprising vulcanized rubber bonded to yarns of regenerated cellulose which includes the steps of impregnating the said yarns with an aqueous solution of a water-soluble compound of a metal chosen from the group consisting of zinc, cadmium, mercury and nickel, treating the impregnated yarns with an aqueous solution of a water-soluble carbonate whereby the carbonate of the said metal is deposited in situ in the yarns, placing the impregnated yarns in contact with unvulcanized rubber and then vulcanizing the rubber so that the yarns are bonded to the vulcanized rubber.
• a process as claimed in claim 3 wherein the proportion of compound is from about 0.5 to about 1.0 per cent by weight of yarn.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Reinforced Plastic Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

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Family Applications (1)

Country Status (4)

Cited By (2)

Citations (4)

• 0
  • NL NL67457D patent/NL67457C/xx active
  • BE BE486106D patent/BE486106A/xx unknown
• 1948
  • 1948-11-18 US US60841A patent/US2511629A/en not_active Expired - Lifetime
  • 1948-12-01 FR FR975728D patent/FR975728A/fr not_active Expired

Patent Citations (4)

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