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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
  • B29D30/00—Producing pneumatic or solid tyres or parts thereof
  • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
  • B29D30/38—Textile inserts, e.g. cord or canvas layers, for tyres; Treatment of inserts prior to building the tyre
  • B29D30/40—Chemical pretreatment of textile inserts before building the tyre
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
  • D06M11/80—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with boron or compounds thereof, e.g. borides
  • D06M11/82—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with boron or compounds thereof, e.g. borides with boron oxides; with boric, meta- or perboric acids or their salts, e.g. with borax
• • 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

• This invention relates to a process for the improvement of the properties of industrial yarns and cords of regenerated cellulose, especially those yarns used to produce tire cord. More particularly, the invention relates to a process which reduces the creep occurring in tire cord made of regenerated cellulose.
• Industrial yarns and cords made of regenerated cellulose are well known for use in reinforcing rubber products such as automotive tires, belting, webbing, etc. Rubber products incorporating such yarns and cords are subjected to forces which extend the rubber during normal use. Such extension is particularly detrimental to reinforcing yarns and cords of regenerated cellulose and quite often causes an extension in the yarn in excess of the normal extension which occurs under load conditions. This over-extension produces in the yarn a phenomenon known as creep which is irreversible. The permanent increase in the length of yarn quite often gives rise to the formation of cracks in the rubber, thus deteriorating the quality of the rubber product.
• the creep which occurs during normal use of industrial yarns and cords of regenerated cellulose can be reduce-d by treating these yarns with an aqueous solution of 0-.3-3. 0% borax, by weight, which solution is maintained within a pH range of 6.5-7.7 by the addition of a buffer. It has been found that industrial yarns and cords treated with such a solution show a marked decrease in creep over previously known regenerated cellulose yarns, without consequent loss in their tensile strength.
• the pH of the borax solution is lower than 6.5 or higher than 7.7 during the process, the tensile strength of the industrial yarns and cords is considerably reduced.
• the yarns and cords can be treated either wet or dry without appreciable difference in result.
• the yarns and cords can be treated with the borax solution while they are traveling, or after collection on a spool or in the form of a spinning cake.
• the yarns and cords can be treated either wet or dry, better results are obtained in tensile strength if the yarns and cords are treated while Wet and without having undergone a drying treatment in any one of the preceding process steps, i.e., while they are in gel state.
• the yarns may be stretched; however, it is preferred that during treatment their length be kept constant. Also, best results can be obtained if the wet yarns are heated while they are in the gel state.
• buffers may be used to control the pH of the aqueous solution.
• suitable buffers are primary and secondary sodium phosphate, trihydroxymethyl aminomethane (tris butter), triethanolamine, maleic acid, and boric acid. It is preferred to use boric acid.
• yarns are usually treated with a liquid containing one or more finishes and water.
• the finishing liquid may be applied to the yarns by passing the yarns through a bath or by spraying the finish directly onto the yarn.
• the yarns may be treated at any point in the process after regeneration with the borax solution of the present invention, it is especially convenient to treat the yarns with the boraxcontaining solution by adding the solution to the finishing liquid.
• the borax treated yarn may be stretched, with stretching taking place during or after passing the yarns through the finishing liquid.
• the process is also etfectively carried out while maintaining the yarn in unstretched condition during and after the borax application.
• the borax solution may contain other compounds, such as Wetting agents, agents that improve adhesion to rubber, or agents that improve resistance to heat and light, without affecting the quality of the product.
• Industrial yarns of the present invention can be treated with the borax solution either in the twisted or untwisted state and twisting may be carried out on either wet or dry yarns without affecting the product quality. It is also possible to effectively treat corded yarns without detracting from the product. The invention will be further described must be maintained within a range of 6.5-7.7 to prevent appreciable loss in tensile strength of the cord.
• EXAMPLE III Run 14 was carried out in the same manner described and understood by means of the following examples, in Example 1, except that after Washlng, e Yf Was which are not intended to limit the invention dried.
• the dry yarn was passed through a fil'llShlllg bath containing 0.7% by weight of borax.
• the pH of the bath EXAMPLE I was maintained at 7.5by addition of boric acid.
• the yarn Eight runs were madtl- In 11111 1, a Control, freshly was corded as in Example I and the bone dry strength p 1,000 filament rayon y having a denier Of 1,650 was 18.0 kg. Cord creep was determined to be 1.0%.
• Example III Was decomposed, Stretched and Washed in a continuous Example III indicates that drying the yarn prior to treatp
• the control Y Was then P through a ment with the borax bath does not affect the improved refinishing hath containing Watfif and finish having 3 P sults in creep obtained by use of the borax solution. of 7.5.
• the yarn was dried on a drum.
• runs 2-8 yarns prepared as the control were sub- EXAMPLE IV jected to varying amounts of borax in the finishing bath.
• Run 15 was carried out in the same manner as described The finishing bath was maintained at a pH value of 7.5 in Example 1, except that the pH of the finishing bath, by the addition of boric acid. containing 0.7% by weight of borax, was maintained at The yarns of runs 18 were Z twisted to 472 turns per a value of 7.5. meter and made into a tire cord by twisting two of such Run 16 was made under the same conditions as run 15, yarns into a cord having an S twist of 472 turns per meter. except that the finishing bath contained no finishing agent.
• the cords prepared were tested for creep and tensile
• the yarns of runs 15 and 16 were not twisted into cords, strength. but tensile strength and the creep were measured directly Creep was determined in the following manner.
• the results of these measurements are pared cord, which had been treated with a latex emulsion shown in Table 3. and dried at 150 C., was heated at 150 C. for 90 seconds TABLE 3 while being maintained at constant length.
• a length of Run this cord, a (in cm.) was loaded at 140 C. with a weight of 2.2 kg.
• the extended cord was measured after 2 15 16 minutes, length 17, and 120 minutes, length c.
• Runs 9-13 were carried out in the same manner as indicated in Example I with the exception that the finishing liquid contained 0.7% by weight of borax for all runs.
• Example V The results of Example V indicate that the invention is not limited to application of the borax solution to regenerated cellulose yarn, but the solution may be applied with equal success to the regenerated cellulose cord.
• Example VI indicates that the pH of the borax baths can be maintained at desired values not only with borax acid, but with other buffer compounds.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Textile Engineering (AREA)
• Health & Medical Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Chemical Or Physical Treatment Of Fibers (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
• Reinforced Plastic Materials (AREA)
• Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Applications Claiming Priority (1)

Publications (1)

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ID=19791049

Family Applications (1)

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Citations (4)

• 1964
  • 1964-09-18 NL NL6410884A patent/NL6410884A/xx unknown
• 1965
  • 1965-09-03 ES ES0317091A patent/ES317091A1/es not_active Expired
  • 1965-09-08 BE BE669345D patent/BE669345A/xx unknown
  • 1965-09-10 CH CH1260365A patent/CH406627A/de unknown
  • 1965-09-15 US US487632A patent/US3425787A/en not_active Expired - Lifetime
  • 1965-09-15 DE DE19651469440 patent/DE1469440A1/de active Pending
  • 1965-09-16 FR FR31631A patent/FR1455452A/fr not_active Expired
  • 1965-09-17 GB GB39832/65A patent/GB1088486A/en not_active Expired
  • 1965-09-17 SE SE12116/65A patent/SE310483B/xx unknown
  • 1965-09-17 AT AT849965A patent/AT256770B/de active

Patent Citations (4)

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