GB2206132A - Changing the colour of polyurethane surface layers e.g. of patent leather - Google Patents

Changing the colour of polyurethane surface layers e.g. of patent leather Download PDF

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Publication number
GB2206132A
GB2206132A GB08709428A GB8709428A GB2206132A GB 2206132 A GB2206132 A GB 2206132A GB 08709428 A GB08709428 A GB 08709428A GB 8709428 A GB8709428 A GB 8709428A GB 2206132 A GB2206132 A GB 2206132A
Authority
GB
United Kingdom
Prior art keywords
colour
layer
polyurethane
coating
applying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08709428A
Other versions
GB2206132B (en
GB8709428D0 (en
Inventor
Michael P Whelband
Frank B Ellis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ERNEST WHELBAND Ltd
Original Assignee
ERNEST WHELBAND Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ERNEST WHELBAND Ltd filed Critical ERNEST WHELBAND Ltd
Priority to GB8709428A priority Critical patent/GB2206132B/en
Publication of GB8709428D0 publication Critical patent/GB8709428D0/en
Publication of GB2206132A publication Critical patent/GB2206132A/en
Application granted granted Critical
Publication of GB2206132B publication Critical patent/GB2206132B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
    • 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
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0059—Organic ingredients with special effects, e.g. oil- or water-repellent, antimicrobial, flame-resistant, magnetic, bactericidal, odour-influencing agents; perfumes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
    • D06P3/02—Material containing basic nitrogen
    • D06P3/04—Material containing basic nitrogen containing amide groups
    • D06P3/24—Polyamides; Polyurethanes

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Coloring (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

A method of treating sheet material comprising a surface layer of polyurethane having a first colour, comprises the steps of (a) applying to the surface of the layer a solvent cleaner in a wiping action, (b) applying to the wiped surface a coating of dyeing agent of a second, darker, colour, (c) leaving the coating for a dwell period, (d) removing excess from the layer of dyeing agent and (e) wiping the surface with said solvent cleaner and (f) treating the dyed surface with a silicone solution. The method is applicable to a surface layer of polyurethane on a leather substrate.

Description

Treatment of sheet material The invention is concerned with improvements in and relating to the treatment of sheet material, particularly sheet material comprising a surface layer of synthetic plastics material, for example, so-called patent leather for use in footwear, handbags and the like.
It is conventional practice to produce a visually attractive, serviceable sheet material for use as footwear uppers, and for bags, belts and other accessories, which material comprises a leather substrate to which is applied a surface layer of polyurethane. This surface layer may be of any desired colour. However, customer demand may vary from time to time and stocks of patent leather of the kind described above may be built up in a colour which for one reason or another is not readily saleable.
The object of the invention is therefore to enable the colour of such patent leather to be be permanently changed.
The invention therefore provides a method of treating sheet material comprising a surface layer of polyurethane having a first colour, comprising the steps of (a) applying to the surface of the layer a solvent cleaner in a wiping action, (b) applying to the wiped surface a coating of dyeing agent of a second, darker, colour, (c) leaving the coating for a dwell period, (d) removing excess from the layer of dyeing agent and (e) wiping the surface with said solvent cleaner and (f) treating the dyed surface with a silicone solution.
Preferably the steps (b), (c), (d) and (e) may be repeated where necessary. The solvent cleaner used may be acetone and the dye may be an azo dye solution, advantageously, black in colour. The silicone solution may preferably be dissolved in an acetone/hydrocarbon solvent.
There will now be described an example of the method according to the invention. It will be understood that the description is given by way of example only and not by way of limitation.
Example Each of a batch of skins to be treated was handled as follows. The skins were splits to which had been bonded a surface layer of polyurethane containing a light green dye.
(a) The entire surface of coloured layer was wiped with 1,1,1, - trichloroethane using a sponge applicator.
(b) The wiped surface was then coated with a layer of black dye material (ref. Nuera 6001) having the following composition: Azo dye C.I. Solvent Black Diacetone alcohol Oleic acid 1,1,1 - trichloroethane - balance )908 (c) The dye material was allowed to remain for 30 minutes (d) After that period had elapsed, the excess dye was wiped off and (e) the surface sponged with acetone.
Steps (b(, (c), (d) and (e) were then repeated.
After the final wiping step with acetone (e), the appearance of the dyed surface was densely black but visually unattractive being prone to smearing and lacking an even gloss.
(f) The dyed surface was then wiped with a silicone solution having the following composition 1 part by vol. acetone 15 parts by vol. hydrocarbon solvent SBP3 (Shell Chemicals) 0.15 parts by vol. silicone solution (viscosity 200-350 centistokes) The resultant appearance of the dyed skin was supple and glossy with no appreciable tendency to smear. The appearance and wear qualities were virtually indistinguishable from a sample of a conventionally manufactured black patent leather skin. Wear tests were conducted according to SATRA guidelines and no delamination, cracking or colour loss was evident.
Various modifications Lnay be made within the scope of the invention.

Claims (6)

Claims:
1. A method of treating sheet material comprising a surface layer of polyurethane having a first colour, the method comprising the steps of (a) applying to the surface of the layer a solvent cleaner in a wiping action, (b) applying to the wiped surface a coating of dyeing agent of a second, darker, colour, (c) leaving the coating for a dwell period, (d) removing excess from the layer of dyeing agent and (e) wiping the surface with said solvent cleaner and (f) treating the dyed surface with a silicone solution.
2. A method as claimed in claim 1, wherein the steps (b), (c), (d), and (e) are repeated.
3. A method as claimed in claim 1 and 2, wherein the solvent cleaner is acetone.
4. A method as claimed in claim 1, 2 or 3, wherein the dye is an azo dye solution.
5. A method as claimed in any preceding claim wherein the silicone solution is dissolved in an acetone/hydrocarbon solvent.
6. A method which is substantially as herein described.
GB8709428A 1987-04-21 1987-04-21 Re-dyeing polyurethane surface layers Expired - Fee Related GB2206132B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8709428A GB2206132B (en) 1987-04-21 1987-04-21 Re-dyeing polyurethane surface layers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8709428A GB2206132B (en) 1987-04-21 1987-04-21 Re-dyeing polyurethane surface layers

Publications (3)

Publication Number Publication Date
GB8709428D0 GB8709428D0 (en) 1987-05-28
GB2206132A true GB2206132A (en) 1988-12-29
GB2206132B GB2206132B (en) 1991-04-17

Family

ID=10616099

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8709428A Expired - Fee Related GB2206132B (en) 1987-04-21 1987-04-21 Re-dyeing polyurethane surface layers

Country Status (1)

Country Link
GB (1) GB2206132B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900164A1 (en) * 2006-04-20 2007-10-26 Pierre Vaille Glove e.g. leather glove, selective dyeing method, involves impregnating aqueous solution of sodium hypochlorite for permitting penetration of dye into polyurethane coating of glove, and immersing glove in new sodium hypochlorite bath

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2900164A1 (en) * 2006-04-20 2007-10-26 Pierre Vaille Glove e.g. leather glove, selective dyeing method, involves impregnating aqueous solution of sodium hypochlorite for permitting penetration of dye into polyurethane coating of glove, and immersing glove in new sodium hypochlorite bath

Also Published As

Publication number Publication date
GB2206132B (en) 1991-04-17
GB8709428D0 (en) 1987-05-28

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PCNP Patent ceased through non-payment of renewal fee