Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
  • D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
  • D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
  • D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments

Definitions

• This invention concerns a procedure for processing cellulose material, by means of dyeing and softening, to obtain an unalterable finished material. More specifically, this invention refers to a dyeing and softening process of cellulose material that makes it possible to obtain a finished product similar in appearance and resistance to leather, and resistant to water, that is to say to washing with detergents and in washing machines, or to dry cleaning processes with ethylene perchlorate.
• the procedure according to the invention substantially foresees the use of a method for processing animal skins employed in tanning, using cellulose as the raw material, to obtain a finished skin to be used for manufacturing leather products, with the feature of not altering if subjected to water washing or dry cleaning.
• This invention can be applied in the sector for the production of fabrics and products similar to leather used in clothing, furnishing and coverings in general.
• the typical example is leather, which has been proposed in an artificial form, or reprocessed or recomposed also with natural products in a plurality of solutions, some of which are described below.
• the US patent US 4,212,927 proposes a process for the production of artificial leather that foresees the processing of cellulose fibres with aqueous baths following the techniques used for the production of paper.
• This patent shows that subjecting a synthetic material to a tanning process produces a product similar to leather even though tanning is not designed to characterize a product but to prevent it from rotting.
• the sheet base consists of a vacuolated polyurethane matrix with internal polyester or polyethylene fibres and a coating of polyurethane resin printed with a design similar to natural leather.
• the sheet material is subjected to: a) wetting in drums with water at 50-60 0 C with surfactants added; b ) the action of an aqueous solution of bi- trivalent metallic salts (tanning-like saline solutions); c) if necessary, additional processing with an aqueous solution of polyaldehyde; d) a tanning-like action with caustic soda; e) a process of greasing with an emulsion of mineral oils and/or fatty acid esters.
• the dyeing phase is carried out after greasing with sulphonated .esters in a rotating drum for a couple of hours with mixtures of specific metallocomplex dyes for polyester fibres and polyurethane polymers.
• the limits of this type of material essentially concern the fact that the finished product cannot withstand washing processes. In particular, this material undergoes evident alterations if washed in water with detergents either in a washing machine or when dry cleaned using the ethylene perchlorate.
• the raw material consists of synthetic skins similar to natural ones, which are subjected to a procedure comparable to tanning.
• This method is not designed for essentially natural products but for products which are mainly synthetic which primarily consist of polyurethane materials, containing polyester or polyethylene fibres coated with a polyurethane resin printed with a design similar to natural leather.
• This material has nothing natural about it, and as a result the finished product will have all the problems typical of artificial products made on a synthetic base.
• This invention proposes to provide a procedure for the creation of materials similar to leather and that can eliminate or at least reduce the drawbacks described above .
• the invention proposes to provide a procedure for the creation of a material that foresees the features of being similar to leather, both from the point of view of softness and in appearance, and which at the same time guarantees the non-alterability when processed with water or ethylene perchlorate.
• the raw material is based on cellulose and is chemically processed in an aqueous solution to dye it and soften it so that it acquires a more leather-like "feel" while maintaining its particular features.
• This invention therefore consists of a procedure for the production of a material similar to leather starting from a cellulose base, whose features are described in the main claim.
• the dependent claims of the solution in question describe advantageous embodiments of the invention.
• One of the features of the cellulose material is that it does not alter when it comes into contact with water of ethylene perchlorate, allowing it to be chemically processed in an aqueous solution to dye it and soften it so that it acquires a leather-like "feel" and maintains its particular features.
• the cellulose material is one that is generally used to make labels for jeans and commercially known as TEXON 601 produced by Texon International. This consists of cellulose fibres impregnated with a dispersion of carboxylated styrene-butadiene polymer and containing vulcanizing and ageing agents and non- nitrogenous pigments.
• the first chemical reaction to which the cellulose material is subjected consists of dyeing, carried out with a predetermined quantity of hot water at 40/50 0 C using either mixtures of metallocomplex dyes alone or adding azodyes and tannin extracts to the solution, this operation lasting from 45 to 60 minutes.
• greasing products are added to the solution in a mixture consisting of sulphonated fish and vegetable oils and synthetic fats, with a further rotation for around 120 minutes.
• the chemical products are then fixed on the material by adding a solution of formic acid to the solution in the drum, and if necessary also a solution of trivalent metal salts, reacting for around 60/90 minutes.
• 150 x 150 cm are inserted in a drum of around 0.4 m 3 in volume, which rotates at a speed of 12 rpm, with 73.5 1 of hot water at a temperature of around 50 0 C and rotated for 3 hours and then left to soak overnight.
• the solution in the drum is now drained off and the material is thoroughly rinsed before adding 29.4 1 of hot water at 40 0 C with 0.098 kg of formic acid, rotating the drum for 10 minutes and then adding 0.098 kg of a solution of acrylic polymer and rotating for another 30 minutes. The solution is then drained off and the material is rinsed thoroughly again.
• the finished product is identical to leather both in consistency and in appearance, presenting the fundamental advantage of being resistant to washing and to stress.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
• Coloring (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=37450750

Family Applications (1)

Country Status (5)

Cited By (1)

Citations (3)

• 2005
  • 2005-09-09 SM SM200500021A patent/SM200500021A/it unknown
• 2006
  • 2006-09-04 EP EP06799880A patent/EP1941094B1/en not_active Not-in-force
  • 2006-09-04 DE DE602006020473T patent/DE602006020473D1/de active Active
  • 2006-09-04 AT AT06799880T patent/ATE500379T1/de not_active IP Right Cessation
  • 2006-09-04 WO PCT/SM2006/000003 patent/WO2007030084A1/en active Application Filing

Patent Citations (3)

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