EP0164076A2 - Verfahren zur Herstellung von Echtleder ähnlichem Kunstleder durch chemische Behandlung einer Kunststoffolie - Google Patents

Verfahren zur Herstellung von Echtleder ähnlichem Kunstleder durch chemische Behandlung einer Kunststoffolie Download PDF

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Publication number
EP0164076A2
EP0164076A2 EP85106681A EP85106681A EP0164076A2 EP 0164076 A2 EP0164076 A2 EP 0164076A2 EP 85106681 A EP85106681 A EP 85106681A EP 85106681 A EP85106681 A EP 85106681A EP 0164076 A2 EP0164076 A2 EP 0164076A2
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EP
European Patent Office
Prior art keywords
solution
sheet material
fact
treated
process according
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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
EP85106681A
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English (en)
French (fr)
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EP0164076B1 (de
EP0164076A3 (en
Inventor
Giorgio Poletto
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.)
Lorica SpA
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Lorica SpA
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Priority to AT85106681T priority Critical patent/ATE48666T1/de
Publication of EP0164076A2 publication Critical patent/EP0164076A2/de
Publication of EP0164076A3 publication Critical patent/EP0164076A3/en
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Publication of EP0164076B1 publication Critical patent/EP0164076B1/de
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    • 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

Definitions

  • the present invention relates to a process for producing artificial leather, which looks and feels exactly the ' same as real tanned leather, using as raw material one of the many synthetic sheet materials known and marketed under various trade names and commonly referred to as "imitation leather".
  • the present invention relates to a chemical process particularly suitable for synthetic sheet material comprising a porous polyurethane resin matrix, the latter embedded with polyester or polyethylene strengthening fibres, and a compact, pressed polyurethane resin cover film patterned to imitate real leather.
  • a major drawback of known materials of the aforementioned type is that they are highly inflammable and therefore re- guire the addition of fireproofing substances.
  • the look, feel and consistency of the said materials is highly unsatisfactory and still far from competing with the appearance and consistency of real leather.
  • the aim of the present invention is to provide a chemical process for treating the aforementioned type of synthetic sheet materials in such a manner as to render the appearance and consistency of the same identical to those of real leather, and also for enabling fireproofing of the same.
  • the present invention relates to a process for producing artificial leather similar to real leather by chemically processing porous, synthetic sheet material, particularly of the type comprising a porous polyurethane matrix, the latter being embedded with polyester and/or polyethylene fibres, and a pressed polyurethane resin cover film patterned to imitate real leather, characterised by the fact that the said process comprises stages whereby :
  • the present Applicant has discovered that, by subjecting porous, synthetic sheet material, imitating real leather, to a process closely resembling tanning, i.e. the process used for preventing real leather from rotting, the appearance and consistency of the said synthetic material were transformed to such an extent as to closely resemble real leather after tanning.
  • tanning is known to have essentially no effect on the appearance and consistency of real leather, the purpose of the process being simply to attack and chemically transform the fibres of which the leather is formed, in such a manner as to prevent the latter from rotting, but without altering the structure on which the well-known properties of real leather depend.
  • synthetic sheet materials known as "imitation leather"
  • applying the said processes to the said synthetic sheet materials would be considered, not only pointless, but indeed educad by an average tanner or organic chemist.
  • porous synthetic sheet material i.e. having micropores visible only under an e.lec- : tronic microscope
  • the said materials absorb and retain internally, in essentially stable manner, at least part of the tanning salt contained in the said salt solutions, in such a manner as to be changed drastically in appearance and consistency after processing; to be more precise, in such a manner as to acquire added consistency and the appearance and feel typical of real tanned leather.
  • the said materials are less inflammable and may be subjected to any known type of specific dying process for the polymers of which the said sheet material so processed is formed, thus enabling, if conducted correctly, the production of a finished product extremely similar to real leather and of good appearance.
  • the present A ppli- cant has also surprisingly discovered that the flexibility of the said materials may be improved to such an extent as to be essentially equal to or only slightly inferior to that of real leather by treating the said materials, not only with the said pseudo-tanning salt solution and the said greasing oil, but also with a solution of water and at least one di- or polyaldehyde.
  • the present Applicant has also surprisingly dis covered that, for obtaining the best results, the pseudo-tanning salt solution process must be conducted different ly from the real leather tanning process, that is, by appropriately adjusting the pH level of the salt solution by adding a strong base, such as NaOH (sodium hydroxide) in place of the weak bases, such as sodium bicarbonate, usually employed in chromium tanning processes; the processing salts used being preferably trivalent metal sulphates and/or chlorides and/or bi-trivalent metal sulphates (i.e. metals, such as iron, capable of assuming various grades of oxidation).
  • a strong base such as NaOH (sodium hydroxide)
  • the weak bases such as sodium bicarbonate
  • the porous, synthetic sheets material is collected and tied firmly into bales of such a size as to enable it to be loaded inside a rotary drum, e.g. of the type normally employed for tanning real leather.
  • the bales of synthetic sheet material so formed are than placed inside the said drums which are than started up and the material chemically processed by feeding the vari ous chemical solutions into the drum as it is turned.
  • the porous synthetic sheet material is first subjected to a "soaking" process essentially consisting in treating the material for ten minutes to an hour at 50-60°C in a solution of water and surface-active substances.
  • the rotary drum is filled with the first processing solution consisting in the said hi-:.and/or trivalent metal salt solution.
  • the synthetic sheet material is treated in the said salt solution for about ten minutes to an hour, until the said solution permeates essentially the entire section of the material, after which, it is treated with a pseudo-tanning caustic soda solution for bringing the pH level up to about 7.
  • the solution is brought up to a temperature of about 60°C and the pH level raised further, though never over 7.5, by precipitating part of the salt contained in the solution in the form of hydroxides, which precipitate in the solution essentially in the form of a gel.
  • the sheet material Upon completion of the precipitation stage, the sheet material is washed to remove any surface traces of hydroxide, after which, the material is treated for ten minutes to an hour, still inside the said rotary drum, with a solution of water and 5-10% by weight of a di- or polyaldehyde.
  • Dialdehyde processing of the material has been found to afford flexibility, as well as maintaining the superior properties acquired by the material in normal use.
  • the material so processed is put through a number of further processes, the most important of which - greasing - has been found to be essential for obtaining the required results, i.e., for transforming the original synthetic material into one identical to real leather.
  • the said greasing process conducted inside rotary drums, is identical to the real leather greasing process, except that use may be made in differently of mineral oils or, preferably, higher fatty acid ester emulsion, preferably charged with sulphur, at a temperature of about 60°C for a few minutes to an hour.
  • the said greasing process is particularly effective in that the esters and oils, which would not normally be retained by compact synthetic resins, are retained by the synthetic fibres and pores in the processed material in such a manner as to give the latter the characteristic appearance of real leather.
  • the said oils and esters also improve fibre flow inside the porous matrix in such a manner as to give the processed material the characteristic consistency and feel of real leather.
  • Further processes the material may be subjected to according to the process covered by the present invention include dying, which is conducted in known manner, i.e. after washing the material in cold water; and fireproofing which, according to the present invention, is performed by treating the material, in a rotary drum for a few minutes to an hour, in a fireproofing solution containing, in place of the normal fireproofing substances employed (with little success) in known fireproofing processes, retarding substances of the type employed for extinguishing forest fires, the said substances being marketed under various trade names and also containing ammonium salts.
  • the process is conducted for about at least an hour at approximately 40°C, after which, the temperature is raised to about 6 0° C for the remainder of the dying stage.
  • the material is then dried by means of forced hot- air ventilation at about 70°C inside the drum, preferably turning at a speed of 4-6 rpm.
  • the sheet material employ ed is preferably 0 .3 to 2 mm thick, depending on what it is to be used for, and, after processing according to the present invention, looks essentially as shown in the microphoto in Fig.2.
  • the two microphotos in Fig.s 1 and 2 clearly show the difference in structure and appearance, even at microscope level, between the said material before (Fig. 1 ) and after (Fig.2) processing according to the present invention.
  • Example I Twelve 1 0 mm strips of synthetic material as in Example I were treated in exactly the same way as in Example I, but using chromium sulphate in place of ferric sulphate. The resulting material presented an excellent consistency and feel and a satisfactory outward appearance as in
  • Example I The materials used in Examples I and II were treated in the same way as in Example I, but using a salt solution of ferrous instead of ferric sulphate. The resulting material after processing was identical to that of Example I.
  • Example I After processing, the sheet material used in Example I was formed into twenty 20 x 20 cm test pieces and comparison-tested, together with corresponding test pieces of tanned calf leather of the same size, as to tensile, abrasion and bending resistance. The results are shown in Table I.
  • Example I The process described in Example I was applied to a start ing sheet material consisting of a 0 .8 mm thick, two-ply sheet of polyurethane foam covered with a compact polyurethane film, of the type normally used for upholstering vehicle sunshields.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
EP85106681A 1984-06-06 1985-05-30 Verfahren zur Herstellung von Echtleder ähnlichem Kunstleder durch chemische Behandlung einer Kunststoffolie Expired EP0164076B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85106681T ATE48666T1 (de) 1984-06-06 1985-05-30 Verfahren zur herstellung von echtleder aehnlichem kunstleder durch chemische behandlung einer kunststoffolie.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT6758584 1984-06-06
IT67585/84A IT1178956B (it) 1984-06-06 1984-06-06 Procedimento per ottenere pellami sintetici simili a quelli naturali mediante trattamento chimico di materiali sintetici in foglio

Publications (3)

Publication Number Publication Date
EP0164076A2 true EP0164076A2 (de) 1985-12-11
EP0164076A3 EP0164076A3 (en) 1986-12-03
EP0164076B1 EP0164076B1 (de) 1989-12-13

Family

ID=11303639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106681A Expired EP0164076B1 (de) 1984-06-06 1985-05-30 Verfahren zur Herstellung von Echtleder ähnlichem Kunstleder durch chemische Behandlung einer Kunststoffolie

Country Status (5)

Country Link
EP (1) EP0164076B1 (de)
JP (1) JPS6141378A (de)
AT (1) ATE48666T1 (de)
DE (1) DE3574749D1 (de)
IT (1) IT1178956B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616791A1 (fr) * 1987-06-19 1988-12-23 Lorica Spa Procede pour obtenir des peaux synthetiques similaires a des peaux naturelles par un traitement chimique d'un materiau synthetique en feuille
EP0504701A1 (de) * 1991-03-19 1992-09-23 Lorica S.p.A. Verfahren zum Umwandeln von Kunstleder zu Folienmaterial ähnlich dem Erscheinungsbild von natürlichem Leder
WO2007030084A1 (en) * 2005-09-09 2007-03-15 Hoto S.R.L. Procedure for the processing of cellulose material to obtain a product similar to leather
CN109023981A (zh) * 2018-10-25 2018-12-18 无锡市曼优丽新型复合材料有限公司 一种抗静电水性人造革
CN111187780A (zh) * 2020-03-12 2020-05-22 南京农业大学 水稻钾离子转运蛋白基因OsHAK18的基因工程应用

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0686711B2 (ja) * 1987-08-20 1994-11-02 アキレス株式会社 合成皮革
IT1401571B1 (it) 2010-08-20 2013-07-26 Okinawa Srl Procedimento per la produzione di un materiale simile alla pelle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1192598A (en) * 1966-12-01 1970-05-20 Kanegufuchi Boseki Kabushiki K Method for making Micro-Porous Sheet Material
DE2010332A1 (en) * 1970-03-05 1971-09-16 Stockhausen & Cie Chem Fab Microporous polyurethane sheet with suede-like - surface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1192598A (en) * 1966-12-01 1970-05-20 Kanegufuchi Boseki Kabushiki K Method for making Micro-Porous Sheet Material
DE2010332A1 (en) * 1970-03-05 1971-09-16 Stockhausen & Cie Chem Fab Microporous polyurethane sheet with suede-like - surface

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2616791A1 (fr) * 1987-06-19 1988-12-23 Lorica Spa Procede pour obtenir des peaux synthetiques similaires a des peaux naturelles par un traitement chimique d'un materiau synthetique en feuille
GR880100387A (en) * 1987-06-19 1989-03-08 Lorica Spa A new improved method of synthetic raw skins similar to the natural ones
BE1003225A3 (fr) * 1987-06-19 1992-02-04 Lorica Spa Procede pour obtenir des peaux synthetiques, similaires a des peaux naturelles par un traitement chimique d'un materiau synthetique en feuille.
AT395730B (de) * 1987-06-19 1993-02-25 Lorica Spa Verbessertes verfahren zum herstellen von synthetischen haeuten, die natuerlichen haeuten aehnlich sind, durch eine chemische behandlung von synthetischem folienmaterial
EP0504701A1 (de) * 1991-03-19 1992-09-23 Lorica S.p.A. Verfahren zum Umwandeln von Kunstleder zu Folienmaterial ähnlich dem Erscheinungsbild von natürlichem Leder
US5290593A (en) * 1991-03-19 1994-03-01 Lorica S.P.A. Process for converting composite imitation leather into sheet material similar in appearance to natural leather
WO2007030084A1 (en) * 2005-09-09 2007-03-15 Hoto S.R.L. Procedure for the processing of cellulose material to obtain a product similar to leather
CN109023981A (zh) * 2018-10-25 2018-12-18 无锡市曼优丽新型复合材料有限公司 一种抗静电水性人造革
CN109023981B (zh) * 2018-10-25 2023-09-26 无锡市曼优丽新型复合材料有限公司 一种抗静电水性人造革
CN111187780A (zh) * 2020-03-12 2020-05-22 南京农业大学 水稻钾离子转运蛋白基因OsHAK18的基因工程应用
CN111187780B (zh) * 2020-03-12 2022-05-27 南京农业大学 水稻钾离子转运蛋白基因OsHAK18的基因工程应用

Also Published As

Publication number Publication date
EP0164076B1 (de) 1989-12-13
JPH0555633B2 (de) 1993-08-17
IT8467585A0 (it) 1984-06-06
DE3574749D1 (de) 1990-01-18
EP0164076A3 (en) 1986-12-03
IT1178956B (it) 1987-09-16
ATE48666T1 (de) 1989-12-15
JPS6141378A (ja) 1986-02-27
IT8467585A1 (it) 1985-12-06

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