WO1993009181A2 - Materiaux deformables et structures comprenant ces materiaux - Google Patents

Materiaux deformables et structures comprenant ces materiaux Download PDF

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Publication number
WO1993009181A2
WO1993009181A2 PCT/GB1992/002008 GB9202008W WO9309181A2 WO 1993009181 A2 WO1993009181 A2 WO 1993009181A2 GB 9202008 W GB9202008 W GB 9202008W WO 9309181 A2 WO9309181 A2 WO 9309181A2
Authority
WO
WIPO (PCT)
Prior art keywords
mixture
shoe
laminate
visco
insole
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.)
Ceased
Application number
PCT/GB1992/002008
Other languages
English (en)
Other versions
WO1993009181A3 (fr
Inventor
Anthony David Harman
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.)
Technology Partnership PLC
Original Assignee
Technology Partnership 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
Application filed by Technology Partnership PLC filed Critical Technology Partnership PLC
Publication of WO1993009181A2 publication Critical patent/WO1993009181A2/fr
Publication of WO1993009181A3 publication Critical patent/WO1993009181A3/fr
Priority to GB9319493A priority Critical patent/GB2268872A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C08L23/20—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms having four to nine carbon atoms
    • C08L23/22—Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/007—Cork

Definitions

  • the present invention relates to defor able materials, and in particular to structures comprising such materials 5 which are for insertion into shoes to provide increased comfort for the wearer.
  • underfoot structures comprising such cork/rubber layers take from days to weeks of wear of the shoe to conform to the underfoot contours of the forefoot and thereby give increased comfort.
  • 25 6B-A-20585 5 discloses a shoe insert to support the toes and prevent the foot sliding forward when wearing, for instance, ladies' court shoes.
  • the insert comprises a sandwich having an intermediate layer of a rubber or a foamed plastics material in the form of a wedge.
  • a deforming insole is described in US-A-4977691 for a athletics shoes.
  • the insole comprises a visco-elastic material which deforms on the application of force, but
  • the disclosure is concerned with shock absorption by an elastic deformation of the insole.
  • a mixture comprises a visco-elastic material having a viscosity in the range of 1 x 10 5 to 1 x 10 7 Poise and a particulate filler.
  • a visco-elastic material having a viscosity in the range of 1 x 10 5 to 1 x 10 7 Poise and a particulate filler.
  • Such a mixture can be provided as a pad in the sole of a shoe, to support the etatarsal/toe crest area of the foot.
  • an insole comprises a well in its front part and, contained within the well, the above-defined mixture. Description of Invention
  • the visco-elastic material is of a viscosity such that it is capable of plastic flow at the temperatures normally found under the foot when wearing shoes, i.e. around 30 to 35°C.
  • the viscosity of the visco-elastic material is in the range of 1 x 10 5 to 1 x 10 7 Poise, preferably 1 x 10 5 to 5 x 10 6 Poise. Viscosity is calculated by use of a shear creep test on the undiluted material at 20°C using a Kheometrics Stress Rheometer RSR and an applied shear stress of 100 Pa until steady state constant shear rate is achieved. The time for such steady state to be achieved is usually around 1 to 2 hours.
  • the visco-elastic material should have chemical properties and a volume that are substantially unaffected by water.
  • Suitable visco-elastic materials are polymers, such as polyisobutenes, polymeric phthalate esters, uncured elastomeric polymers plasticised with high molecular weight polymeric plasticisers, tackifier resins, silicone and
  • Preferred materials are polyisobutenes, particularly
  • Oppanol B products allow fine tuning of the time taken for the material to respond to the application of pressure by deforming (such a time is called the response time) .
  • the molecular weight of the visco-elastic material is chosen such that the requisite viscosity properties are obtained.
  • the range of molecular weights of any particular visco-elastic material should be narrow, and there should
  • the visco-elastic material is mixed with a particulate filler material.
  • the filler aids in the provision of
  • Suitable fillers include cork granules, rubber particles, rubber icroballoons and ver iculite. Preferred fillers, in
  • the filler usually has a density in the range of 10 to 1000, n preferably 10 to 100, kg/m 3 .
  • the filler's density is usually less than that of the visco-elastic material; lower
  • the particulate filler has a particle size of from 0.5 to 2 mm, preferably 0.5 to 1.5 mm, or even smaller, e.g. as formed by grinding cork granules.
  • the filler should not occupy more than 70% by volume of mixture, and preferably the amount of filler is in the range from 35 to 60% by volume. The reason for minimising the filler in this way is to allow significant- plastic flow under foot-loading pressures in a relatively short time period.
  • the time for the mixture to undergo significant plastic flow under load is typically in the range 10 minutes to 8 hours.
  • the mixture is provided by mixing together the visco- elastic polymeric material and the filler. Mixing may require an elevated temperature to lower the viscosity of the visco-elastic material temporarily, and to allow calendering of the mixture to a defined sheet thickness.
  • the filler must necessarily withstand such temperatures.
  • the visco- elastic material is an Oppanol B product the filler must withstand temperatures of at least 100°C. Such temperatures temporarily lower the viscosity of the Oppanol B and thereby aid the dispersion of the filler in the mixture.
  • the mixture can then be laid directly into a pre ⁇ formed well or depression in the front part of a conventional insole.
  • the mixture is then covered by a sheet which can be sealed at its edges with the insole board, or can overlap the edges of the insole board and then be sealed to the insole board.
  • the sheet secures the mixture within the well.
  • the mixture can be directly laid onto an insole of a shoe, or into a pre-formed depression formed therein, and then covered by an innersole.
  • insole is used to describe the layer of the shoe sole upon which traditional lasting operations are performed.
  • innersole is used to describe the layer of the shoe sole which contacts the foot. Therefore, 5 from ground to foot a typical shoe sole construction is outsole, insole and innersole in that order.
  • a laminate of the invention comprises the visco- elastic material/filler mixture between two sheets of materials which may be polymeric films or sheets of a non- 10 woven material.
  • the sheet materials can be sealed at their edges, for example by welding or heat-sealing, or can be formed integrally with one another, to form a bag to encapsulate the visco-elastic material/filler mixture.
  • the sheet materials can act to separate the visco-elastic 15 material/filler mixture from the remainder of a shoe structure, so preventing leakage of the visco-elastic material and any undesirable interaction with, for example, adhesive bonds within the structure.
  • the sheet materials typically have a thickness of from 20 25 to 200 ⁇ m. They may be of polymeric materials such as polyurethane elastomers, plasticised PVC and olefinic polymers, and non-woven materials comprised of fibres of materials such as polypropylene, polyethylene, viscose or wood pulp.
  • the sheet materials can be the same or 25 different, and one sheet material can comprise an insole board.
  • the laminate typically has a thickness in the range 0.5 to 6 mm, preferably 1 to 3 mm.
  • the laminate When the laminate is made separately from the shoe and 30 insole, it is typically calendered between two sheets, and then cut to shape, optionally with bonding of the sheets at their periphery.
  • the laminate can then be secured to an insole, or into a well therein, by a further sheet of l ⁇ material adhered to the side of the laminate not adjacent 35 the insole which overlaps the edges of the insole.
  • the laminate can be laid on an inner sole and covered by an insole.
  • laying of the mixture and/or calendering of the mixture may require an elevated temperature, usually the same temperature as that used in mixing, to facilitate these processes.
  • a foam layer may be interposed between the laminate and the insole to form a composite, and which provides extra elastic cushioning during the trying-on of a shoe in a store and during initial wear.
  • the foam layer can be an open-cell or a closed-cell foam, which responds quickly to applied pressure and moulds quickly, but substantially elastically, to the wearer's foot.
  • the foam layer typically comprises a closed-cell polymeric foam, for example flexible polyethylene or polyethylene/ethyl vinyl acetate (PE/EVA) foam which has been chemically blown from a solid sheet of material using infra-red radiation to activate a blowing agent in the sheet.
  • PE/EVA polyethylene/ethyl vinyl acetate
  • Such a foam may have a density of from 20 to 100 kg/m to give elastic and compression set properties that are suitable for offering the correct feeling of cushioned comfort underfoot.
  • Such a foam layer preferably has a maximum thickness of 5 mm, and more preferably has a thickness in the range of 1 to 3 mm.
  • Compression set is the property of recovering of a deformable material after a specified period of time after the release of a compression deflection which has been applied for a specified period of time.
  • a low compression set is characteristic of an elastic deformation, such as the foam layer described above undergoes on the application of a compression deflection, i.e. that caused by under-foot pressure.
  • a high compression set is characteristic of a permanent deformation, such as the plastic flow of the visco-elastic material/filler mixture, or a laminate thereof, on the application of a compression deflection caused by under-foot pressure.
  • a further optional feature may be incorporated, in the form of height-limiting seams.
  • the seams are formed by spot or line-welding the two sheets together at positions near the front edge of the laminate to create a "pin cushion", quilted or striped format of welds that limit the maximum height of such a pad, for example, to 6 mm when fully conformed in the region under the toe crest.
  • This optional feature may be necessary to avoid the visco-elastic material/filler mixture accumulating towards the front of the laminate as a result of the shear forces exerted on the pad during walking.
  • the novel mixture, or a laminate, composite or pad containing it, is particularly useful in the region of the foot under and around the metatarsal heads, including the toe crest region.
  • the metatarsal head regions are subjected to higher underfoot pressure than other regions of the forefoot.
  • a mixture of the invention increases the contact area between the foot and the shoe around these regions, and distributes the pressure over a larger area, thereby diminishing the higher pressures under the metatarsal heads.
  • a visco-elastic material/filler mixture was provided by mixing at 140°C Oppanol B12 (from BASF) with 0.5 to 2 mm sized cork granules having a density of 30 to 60 kg/m , to give a mixture having a 50:50% v/v ratio of Oppanol B12:cork.
  • the mixture was then calendered between two 50 ⁇ m thick polyethylene films to an overall laminate thickness of 1.8 mm, which was then cut to a shape suitable for incorporation into a 1.5 to 2.5 mm deep pre-formed well, or depression, formed in the forepart of a conventional fibrous insole board by the application of heat and pressure.
  • a further 50 ⁇ m polyethylene film was laminated and adhered to the top of the laminate, such that this further film overlapped the insole board well boundaries and sealed the laminate within the insole board * well.
  • PE/EVA foam of 30 to 40 kg/m density and 2 mm initial thickness, manufactured by Alveo-Sekisui (UK) Limited, was adhered to the laminate construction, such that the PE/EVA foam overlapped the edges of the polyisobutene/cork laminate, and extended to the boundaries of the forepart of the insole board.
  • the insole board containing the laminate of the present invention and the further layer of collapsible foam was then used as normal in the shoe lasting and subsequent manufacturing steps.
  • an innersole of a good quality leather was adhered to the exposed face of the PE/EVA foam to complete the assembly.
  • the maximum weight of the underfoot comfort structure described was below 10 g, and it occupies less than 2 mm of the toe-box height of the shoe. It is therefore particularly applicable to the provision of comfort in ladies' court shoes, in which there are severe restrictions on the thickness and weight allowable for such underfoot comfort structures.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

Cette invention concerne un mélange de matériau polymère visco-élastique dont la viscosité se situe dans la plage comprise entre 1 x 105 et 1 x 107 Poise et d'un matériau de remplissage particulaire, qu'on utilise plus particulièrement dans les structures de chaussures pour épouser la forme de la plante du pied et assurer un meilleur confort.
PCT/GB1992/002008 1991-10-31 1992-11-02 Materiaux deformables et structures comprenant ces materiaux Ceased WO1993009181A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9319493A GB2268872A (en) 1991-10-31 1993-09-21 Deformable materials and structures comprising the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9123107.6 1991-10-31
GB919123107A GB9123107D0 (en) 1991-10-31 1991-10-31 Conformable underfoot pad

Publications (2)

Publication Number Publication Date
WO1993009181A2 true WO1993009181A2 (fr) 1993-05-13
WO1993009181A3 WO1993009181A3 (fr) 1993-08-05

Family

ID=10703834

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1992/002008 Ceased WO1993009181A2 (fr) 1991-10-31 1992-11-02 Materiaux deformables et structures comprenant ces materiaux

Country Status (3)

Country Link
AU (1) AU2891492A (fr)
GB (1) GB9123107D0 (fr)
WO (1) WO1993009181A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012941A1 (fr) * 1996-09-27 1998-04-02 Daramic, Inc. Chaussure et son procede de production

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402411A (en) * 1966-01-12 1968-09-24 Hanson Alden Wade Process for making boots, sports equipment and hats
GB1215457A (en) * 1966-06-20 1970-12-09 British United Shoe Machinery Improvements in or relating to shoes and the manufacture thereof
US3567471A (en) * 1967-05-16 1971-03-02 George F Kahle Nonsettling thixotropic cold bottom filler composition
JPS6034681A (ja) * 1983-08-04 1985-02-22 Bando Chem Ind Ltd 床材

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012941A1 (fr) * 1996-09-27 1998-04-02 Daramic, Inc. Chaussure et son procede de production

Also Published As

Publication number Publication date
GB9123107D0 (en) 1991-12-18
AU2891492A (en) 1993-06-07
WO1993009181A3 (fr) 1993-08-05

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