EP1192285A1 - Impregnation du cuir avec une substance en microcapsules - Google Patents

Impregnation du cuir avec une substance en microcapsules

Info

Publication number
EP1192285A1
EP1192285A1 EP00965615A EP00965615A EP1192285A1 EP 1192285 A1 EP1192285 A1 EP 1192285A1 EP 00965615 A EP00965615 A EP 00965615A EP 00965615 A EP00965615 A EP 00965615A EP 1192285 A1 EP1192285 A1 EP 1192285A1
Authority
EP
European Patent Office
Prior art keywords
leather
micro
roller
encapsulated
encapsulated material
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.)
Withdrawn
Application number
EP00965615A
Other languages
German (de)
English (en)
Inventor
Robert Painter
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.)
Pittards PLC
Original Assignee
Pittards PLC
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
Priority claimed from US09/299,494 external-priority patent/US6277439B1/en
Priority claimed from GBGB9909561.4A external-priority patent/GB9909561D0/en
Application filed by Pittards PLC filed Critical Pittards PLC
Publication of EP1192285A1 publication Critical patent/EP1192285A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D06P3/32—Material containing basic nitrogen containing amide groups leather skins
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
    • 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
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/0004—General aspects of dyeing
    • D06P1/0016—Dye baths containing a dyeing agent in a special form such as for instance in melted or solid form, as a floating film or gel, spray or aerosol, or atomised dyes

Definitions

  • This invention relates to a method of impregnating leather with a material which is incorporated into the leather in a micro-encapsulated material.
  • the present invention is concerned with providing a general purpose method which is capable of impregnating a wide range of different materials into the leather, but using a generally similar process. Accordingly the present invention contemplates first encapsulating the material or agent into a micro- encapsulated form.
  • the impregnation process may be determined substantially on the basis of the size and composition of the micro-capsule shells rather than exclusively on the basis of the material which is required to be added.
  • U.S. Patent 4,510,188 describes a method for making a textile or leather material with a chromatic effect in which a layer of a micro-encapsulated liquid cholesteric crystal material is applied to the surface of the textile material or leather.
  • the micro-encapsulated material is applied as a dispersion of capsules in a synthetic resin. In this process, the material is applied as a surfacial layer rather than being impregnated into the fibrous structure of the leather.
  • the techniques of the present invention differ from the processes disclosed in U.S.
  • U.S. Patent 5,368,609 discloses a process for softening leather in which thermoexpansible microcapsules (TEMCs) are impregnated into the leather and then caused to expand.
  • the TEMCs contain a volatile liquid which is designed to evaporate and cause the capsule to expand by preferably ten to sixty times their original volume.
  • This technique is concerned with the mechanical function of the microcapsules rather than using the capsules as a vehicle for impregnating material into the leather.
  • the microcapsules are impregnated into the leather in a wet process.
  • German Published Application DE-A-3921145 discloses an arrangement for rendering leather surfaces matt. In this process a microcapsule material is applied to the surface of the leather by means of a spray gun, to provide a surfacial coating.
  • O95/34609 discloses an arrangement in which a binder containing encapsulated phase change materials is coated to a leather substrate. This earlier document refers to a surfacial coating rather than a partial or complete impregnation of the leather material.
  • This invention is therefore concerned with providing a method whereby a wide range of different agents, additives, etc. may be incorporated into the leather to impart to it properties otherwise difficult or impossible to attain consistently and permanently in the context of normal use.
  • additives include biocides, scents, colourants, softening agents, fillers, levelling agents, fault observing agents, phase change materials, abrasion enhancers, magnetic substances, humectants, water-proofing agents and fire-retarding agents.
  • the invention is concerned with selectively focusing the application of the micro- encapsulated material to the required region of the leather, whether this be impregnated throughout the thickness of the leather, confined to a restricted layer of the thickness at or below surface level, or additionally including a surfacial layer.
  • phase change materials it is particularly important to distribute the material in a substantially uniform manner through the depths of the leather to be treated.
  • the microencapsulation of the phase change material means that it retains its integrity within the micro-capsules and can cycle through the phase change without dispersing into the leather.
  • the phase change material provides the leather with a thermal buffer effect which can provide enhanced comfort for the user. If the leather is used e.g. in gloves, boots, shoes, etc, and intended for cold use, the melting point of the phase change material may be selected such that when the temperature of the leather falls below a certain threshold, the phase change material solidifies, giving up heat and warming the skin of the wearer.
  • this invention provides a method of impregnating leather with a material, which comprises the steps of : - impregnating leather with a material, which comprises the steps of : - providing a micro-encapsulated supply of said material ; applying said micro-encapsulated material to the flesh side of said leather using a roller which applies pressure to said leather, thereby to cause said micro-encapsulated material to be impregnated in said leather.
  • micro-encapsulated material is applied to the surface of said roller at a controlled rate, typically of between 60g/m 2 and 180g/m 2 .
  • the micro-encapsulated material preferably has a capsule size in the range of from 5 to 40 microns.
  • the leather is preferably conveyed past said roller by a conveyor belt means.
  • the conveyor belt means and said roller may have substantially the same linear speed and direction. However, in certain applications it may be desirable for the speeds to be different to provide a differential slip effect between the roller and the leather. In other instances it may be useful to have the roller and the conveyor belt means running in different directions to provide a strong scrubbing action.
  • the conveyor belt means and said roller have a linear speed of between 2 and lOm/min.
  • the micro-encapsulated material is preferably in the form of a liquid slurry comprising an aqueous base and one or more agents selected from thickening agents, wetting agents, dispersants, and flow aids.
  • the roller provides a compression action on the leather such that the roller gap is between 60% and 90% of the thickness of the uncompressed leather. This means that the leather is compressed as it passes under the roller and re-expands immediately thereafter and this action is thought to enhance absorption of the micro- encapsulated material into the fibrous matrix of the leather.
  • the leather may be passed two or more times past the roller to achieve the required amount of impregnation.
  • One of the advantages of the method of this invention is that it allows a substantially uniform impregnation of the micro-encapsulated material throughout the fibrous matrix. This means that the packing density of the micro- encapsulated material within the leather for a given application rate is minimized, thereby reducing the effect that the impregnation has on the "feel" of the leather. In the case of non-uniform impregnation near the surface of the leather, the packing density of the micro-encapsulated material is relatively high which means that the leather can feel stiff.
  • this invention provides a method of impregnating leather which comprises the steps of: providing a micro-encapsulated supply of said material , introducing said micro-encapsulated material into a drum containing said leather and a liquid float, and drumming said micro-encapsulated material into said leather in a wet process .
  • said wet process is carried out at a temperature of between 40°C and 50°C.
  • the encapsulated material is preferably introduced into the wet process at rate of approximately 50% of the dry weight of the leather.
  • drumming step is preferred for at least one hour.
  • the micro-encapsulated material may be drummed into the leather during a retanning process, in which the pH of the liquid float is preferably maintained at a value of from 5.5 to 6.0.
  • the micro-encapsulated material may be drummed into the leather during a dyeing process in which case the pH is preferably maintained at a value in the range of 6.0 to 7.5. Additionally or alternatively, the material may be drummed into said leather during a fat-liquoring process, in which case the pH of the liquid float is preferably maintained at a value in the range of from 5.5 to 6.5.
  • the invention also extends to leather produced in accordance with this invention and to articles made wholly or partially of leather in accordance with this invention.
  • the leather may be used in gloves, footwear, clothing, leathergoods such as suitcases, wallets, straps, etc, and saddlery, and any other applications where dispersion of selected materials in said leather in micro- encapsulated form may prove beneficial .
  • the invention has been described above, it extends to any inventive combination of features set out above or in the following description.
  • micro-encapsulated materials Two methods of application of micro-encapsulated materials are described herein and the specific method used will depend on the properties to be imparted by the material, namely a wet process and a roller coater process.
  • micro-encapsulated scents may need to be deposited randomly throughout the fibre structure of the leather, in which case they may be applied in a wet process during the retanning, and/or dyeing, and/or fatliquoring operations.
  • Other micro-encapsulated materials, such as colouring agents may need to be impregnated at a controlled application amount in to the leather matrix; in this case a roller coating process may be used.
  • the micro-encapsulated materials are available either in the form of a dry powder or as an aqueous dispersion.
  • the micro-encapsulated materials are introduced to the leather when it is undergoing other chemical treatments in the process vessel or "drum” .
  • the leather is placed within the drum and the chemical treatments are applied either directly to the drum or in a "float" of water.
  • the process parameters which can be manipulated to achieve the desired results include the weight of the chemicals offered relative to the leather weight, the process time, the rotating speed of the drum, the pH, volume and/or temperature of the float, and the chemical concentration within the float .
  • the micro-encapsulated materials may be offered to the leather during one or more of the following wet processes, which are designed to modify various characteristics of the leather : - Retanning - this process is carried out typically to alter the feel, thickness, grain "break” and/or looseness of the leather, and to allow penetration and levelness of dyeing; Dyeing - this process is carried out to give the desired colour of the leather, and this colour may be penetrated throughout the cross-section of the leather, partially through the cross-section or only on the leather surf ce . Fatliquoring - this process is carried out to soften the leather, lubricating the leather fibres by coating them with oil .
  • micro-encapsulated materials may be added during one or more of the retanning, dyeing or fat liquoring stages and the effect determined by routine experimentation and selection of the use of the above parameters of temperature, pH, etc.
  • the micro-encapsulated material may be added to the leather in the drum before the leather has been fully wetted out or after wetting out but before any retanning, dyeing or fatliquoring stage.
  • the temperature of the float is adjusted to between 40°C and 50°C and the pH to a value suitable for the chosen leather-making stage, for example pH 5.5 to 6.0 for retanning, 6.0 to 7.5 for dyeing, and 5.5. to 6.5 for fatliqouring.
  • the dry weight of the leather to be treated is determined and a suitable amount of micro-capsules, based on a percentage of the weight of leather is added.
  • the choice of the micro-capsules and the property that they impart to the leather will determine the amount that is added, but in a typical embodiment the dry capsules are added at a rate of 50% of the weight of the dry leather.
  • the required weight of capsules are dispersed in the same weight of water at 50EC with a wetting agent such as Tergolix AL (Clariant UK Ltd. , Calverley Lane, Horsforth, Leeds, LS18 4RP, England) at an amount of half a percent based on the weight of capsules.
  • Tergolix AL wetting agent is particularly useful for this because its amphoteric nature allows it to be used in a wide range of pH conditions and with other chemicals.
  • the dispersion so formed is added to the float whilst the drum is rotating and the capsules are caused to penetrate into the leather structure by the drumming action.
  • micro-capsules may be added in more than one leather processing stage.
  • a roller coater arrangement 10 is shown in the drawing.
  • a conveyor belt 12 runs over rollers 14 and 16, one of which is driven.
  • a roller 20 Disposed above the upper run of the conveyor, by an adjustable distance, is a roller 20 which, in this embodiment, is driven to have the same linear speed and direction as the conveyor.
  • the roller 20 is coated with slurry material 22 from a reservoir 24 and the amount of coating on the roller is controlled by a doctor blade 26.
  • the roller surface is embossed or otherwise patterned to provide the required coating amount .
  • the roller spacing is set up so that the minimum gap is approximately 75% of the uncompressed thickness of the leather to be treated.
  • the roller 20 and the conveyor are set in motion so that the roller has a controlled coating thereon and a piece of leather is fed under the roller by placing it on the conveyor upstream thereof.
  • the leather is passed under the roller it is compressed to approximately 75% of its thickness and then relaxed, during which process the material on the roller is transferred to the leather and absorbed into the structure thereof. If required the leather piece may be passed under the roller one or more further times.
  • the micro-encapsulated material is absorbed into the dry structure of the leather, using the natural fibre matrix of the leather as a means of holding the measured amount of micro-encapsulated material within the leather structure, with or without the use of additional binders.
  • the capsules are applied to the leather structure by a combination of mass effect and the pressure applied by the roller system to the leather surface.
  • the latter has a squeezing effect, which forces the capsules into the structure of the leather. This reinforces the natural absorbing character of the leather to draw liquids into its matrix.
  • the amount supplied can be adjusted in a number of different ways, either singly or in combination.
  • the proportion of capsules in the treatment can be increased or decreased, thereby adjusting the amount of material applied.
  • the treatment may be applied in one or multiple coats. Where desired, a further deposition of capsules may be applied to the surface of the leather, as an extension of the treatment already within the structure .
  • the application of the pressure of the roller is an important feature in helping to force the capsules into the fibre matrix.
  • Two of the factors that effect this penetration are the surface tension of the treatment, and the pressure applied by the roller. In general, the lower the surface tension and the higher the roller pressure, the deeper the capsules will penetrate. These variables, coupled with the capsule concentration and the number of passes, allow the operator to determine the rate and depth of treatment applied.
  • This embodiment therefore allows the operator to control the extent of penetration, ranging from a coating which barely penetrates the flesh side of the leather, to one in which the leather is substantially uniformly impregnated.
  • the surface tension may be adjusted in a number of ways which will be known to those skilled in the art. For instance a solvent or a surface active agent such as a detergent may be used, but the invention is not so limited.
  • the pressure applied by the roller likewise may be controlled or adjusted by any of the ways known to those skilled in the art.
  • the micro-encapsulated material may be either of liquid or powder origin and may be mixed with combinations or resins, waxes, fillers and viscosity modifiers to give a blend of suitable viscosity and rheological properties to be applied by the roller coating machine.
  • Example 2
  • Thickener RM825 (Stahl GB Ltd, Bakewell Road,
  • the micro-capsules may be of any suitable form to act as a vector for the material to be impregnated into the leather.
  • the micro-capsule shells may be formed of urea formaldehyde resins, paraffin waxes and yeast cells, polyvinylchloride, polyvinylidene chloride, polyolefin, polyester, polyurethane, polyacrylate, polyvinylacetate, polystyrene, or co-polymers thereof.
  • the typical capsule size is between 5 and 20 microns.
  • the above composition was mixed to form a slurry which was used to fill the reservoir 24 of a roller coater apparatus of the form shown in the drawing.
  • the viscosity of the slurry was 5.5 sees (measured by BS3900A6, Ford No. 6 cup) .
  • the roller 20 and doctor blade 26 are set up to provide an application level of between 60g/m 2 and 180g/m 2 of the slurry as a whole .
  • the minimum roller gap was set to be 0.2mm and the linear speeds of the roller and the conveyor set to be 5m/min.
  • Dry leather of thickness 0.45mm was then fed under the roller to be impregnated with the micro-encapsulated material .
  • micro-capsules This caused the micro-capsules to be impregnated throughout a major part of the thickness of the leather.

Abstract

Selon cette invention, on imprègne le cuir avec une substance en microcapsules en incorporant la substance à des microcapsules puis en appliquant ces microcapsules au cuir au moyen d'un procédé approprié. L'invention décrit un procédé d'application par rouleau dans lequel la substance est appliquée à un rouleau sous lequel défile le cuir, que l'on comprime. En variante, les microcapsules peuvent être appliquées audit cuir par lustrage dans le cadre d'un procédé humide.
EP00965615A 1999-04-26 2000-04-25 Impregnation du cuir avec une substance en microcapsules Withdrawn EP1192285A1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US299494 1999-04-26
US09/299,494 US6277439B1 (en) 1999-04-26 1999-04-26 Impregnation of leather with micro-encapsulated material
GB9909561 1999-04-27
GBGB9909561.4A GB9909561D0 (en) 1999-04-27 1999-04-27 Impregnation of leather with micro-encapsulated material
US09/513,397 US6685746B1 (en) 1999-04-27 2000-02-25 Impregnation of leather with micro-encapsulated material
US513397 2000-02-25
PCT/GB2000/001604 WO2000065100A1 (fr) 1999-04-26 2000-04-25 Impregnation du cuir avec une substance en microcapsules

Publications (1)

Publication Number Publication Date
EP1192285A1 true EP1192285A1 (fr) 2002-04-03

Family

ID=27269709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00965615A Withdrawn EP1192285A1 (fr) 1999-04-26 2000-04-25 Impregnation du cuir avec une substance en microcapsules

Country Status (2)

Country Link
EP (1) EP1192285A1 (fr)
WO (1) WO2000065100A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10117671A1 (de) * 2001-04-09 2002-10-10 Bayer Ag Mit duftstoffhaltigen Mikrokapseln ausgerüstetes Leder
US9434869B2 (en) 2001-09-21 2016-09-06 Outlast Technologies, LLC Cellulosic fibers having enhanced reversible thermal properties and methods of forming thereof
CN102268493A (zh) * 2011-07-14 2011-12-07 上海应用技术学院 一种玫瑰香型皮革的制备方法
CN110273302B (zh) * 2019-06-22 2021-07-06 浙江梅盛实业股份有限公司 一种多功能超细纤维合成革的制备方法
CN114410851A (zh) * 2022-01-23 2022-04-29 浙江奥康鞋业股份有限公司 一种有香味的新型牛皮材料及其制作工艺

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4514461A (en) * 1981-08-10 1985-04-30 Woo Yen Kong Fragrance impregnated fabric
DE3921145A1 (de) * 1989-06-28 1991-01-10 Basf Ag Verfahren zum mattieren von lederoberflaechen
JPH04168200A (ja) * 1990-10-30 1992-06-16 Henkel Hakusui Kk 革用柔軟充填剤
JP3615882B2 (ja) * 1996-10-31 2005-02-02 株式会社ワコール 芳香性皮革およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0065100A1 *

Also Published As

Publication number Publication date
WO2000065100A1 (fr) 2000-11-02

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