EP0847707A2 - Chaussure antistatique - Google Patents

Chaussure antistatique Download PDF

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Publication number
EP0847707A2
EP0847707A2 EP97309976A EP97309976A EP0847707A2 EP 0847707 A2 EP0847707 A2 EP 0847707A2 EP 97309976 A EP97309976 A EP 97309976A EP 97309976 A EP97309976 A EP 97309976A EP 0847707 A2 EP0847707 A2 EP 0847707A2
Authority
EP
European Patent Office
Prior art keywords
additional layer
static
footwear according
footwear
sole
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Withdrawn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
EP97309976A
Other languages
German (de)
English (en)
Other versions
EP0847707A3 (fr
Inventor
Nico Louis Katan
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.)
Shico Industrial Footwear Ltd
Original Assignee
Shico Industrial Footwear 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 Shico Industrial Footwear Ltd filed Critical Shico Industrial Footwear Ltd
Publication of EP0847707A2 publication Critical patent/EP0847707A2/fr
Publication of EP0847707A3 publication Critical patent/EP0847707A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B7/00—Footwear with health or hygienic arrangements
    • A43B7/36—Footwear with health or hygienic arrangements with earthing or grounding means

Definitions

  • This invention relates to anti-static footwear.
  • Anti-static footwear is required for health and safety reasons in many different working environments. In some environments, a spark created by the discharge of static electricity could be very dangerous, due to the risk of explosion or fire. For this reason, most countries set standards for the use of anti-static footwear in certain environments.
  • antistatic footwear In the European Union, antistatic footwear must have a discharge rating of less than 1000 M ⁇ . However, in most industries where static electricity is a risk, footwear is used with a much lower discharge rating, typically 50 to 150 M ⁇ . However, even these levels are not low enough for the many industries where small levels of static discharge can cause destruction of sensitive components, or may be very dangerous. For example, 50 to 150 M ⁇ is to high for the electronics industry, particularly in the manufacture of computer components, in the explosives industry, and in the production of nylon fibres.
  • footwear which has a low enough static discharge rating that it can be used in the electronics industry, and which makes it possible to dispense with other means for protecting against static discharge.
  • footwear having inner and outer soles, with an anti-static layer disposed within the inner and outer soles.
  • anti-static footwear comprising an outer sole made of an anti-static material, an inner sole made of an anti-static material, the inner sole being laminated with the outer sole, and an additional layer made of an anti-static material, the additional layer being disposed between the inner sole and the outer sole.
  • the additional layer comprises particles of an anti-static material, at least some of said particles being disposed within said additional layer. It is particularly desirable that the anti-static particles are dispersed substantially homogeneously throughout the additional layer.
  • the additional layer preferably comprises a blend of a polymeric material with the antistatic particles.
  • the additional layer is a solid foam material.
  • the additional layer is a closed cell foam, preferably formed of an ethylene homopolymer or copolymer. We have obtained particularly good results when the additional layer is a low density polyethylene homopolymer or a copolymer of ethylene and vinyl acetate.
  • the additional layer preferably has a volume resistivity in the range 100 to 10000 ohm.cm, more preferably 500 to 2000 ohm.cm, most preferably substantially 1000 ohm.cm.
  • the foam is manufactured by blowing with nitrogen gas, preferably with substantially pure nitrogen gas.
  • nitrogen gas preferably with substantially pure nitrogen gas.
  • Suitable processes for producing the foams useful in the present invention are described in US-A-3640915, and in GB-A-899,389. Broadly, antistatic foams produced in accordance with the methods disclosed in these references are useful in the present invention.
  • One particularly suitable additional layer comprises a material sold under the name EVAZOTE by Zotefoams plc of Croydon, England. This is an ethylene-vinyl alcohol copolymer, which is made into a foamed product by expansion using pure nitrogen gas. The product has a density in the range 18 to 120 kg/m -3 .
  • the most useful grade of EVAZOTE is the CN (ie "conductive") grade.
  • the inner and outer sole are laminated with the additional layer being disposed therebetween.
  • the additional layer can be compressed between the inner and outer sole.
  • the additional layer may have a thickness of, for example, 5-10 mm, typically 6 mm.
  • the inner and outer soles have heel and toe areas. It is especially preferred that the additional layer is disposed between the toe areas of the inner and outer soles, and is not disposed between the heel areas of the inner and outer soles.
  • inner and outer soles of an anti-static material is known in footwear.
  • the anti-static inner and outer soles may be made of any conventionally available material.
  • the inner sole may be made of cellulose fibre, latex and at least one anti-static additive. Typically there would be 60 to 90 wt% cellulose fibre, and 10 to 30 wt% latex and additives.
  • One particularly suitable inner sole is available under the trade name Bontex 38 from Bontex S.A. This inner sole comprises 75 wt% cellulose fibre and 25 wt% latex and additives.
  • the outer sole may be made of a polymeric material with an anti-static additive.
  • the outer sole may include other additives, such as plasticisers, accelerators, antioxidants and fillers (eg silica).
  • the polymeric material is usually a rubber, such as nitrile rubber, and typically makes up over 50 wt% of the composition of the outer sole.
  • the anti-static material typically comprises 5 to 10 wt% of the composition of the outer sole.
  • suitable materials for the outer sole there are many suitable materials for the outer sole; one suitable outer sole material is available from Procalcado under the trade name FOREVER
  • the footwear according to the invention may, of course, be provided with other components required for footwear, such as an upper, shoe laces etc.
  • the footwear according to the invention has a much lower anti-static discharge rating than any other footwear available. We have obtained discharge ratings as low as 2 M ⁇ , which is more than low enough to be used in the electronics industry.
  • antistatic footwear generally designated 100 comprises an anti-static outer sole 10, an anti-static inner sole 12 and an anti-static foam layer 14.
  • the inner sole 12 is arranged on top of the outer sole 10, with the additional layer 14 sandwiched between the soles 10 and 12.
  • the footwear 100 also includes a conventional upper 16.
  • the footwear has a heel portion 18 and a toe portion 20.
  • the foam layer 14 is provided only in the region of the toe portion 20, not the heel portion 18.
  • the foam layer 14 can be partly or completely disposed in a recess formed in the inner sole 12 and/or the outer sole 10.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP97309976A 1996-12-11 1997-12-10 Chaussure antistatique Withdrawn EP0847707A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9625763.9A GB9625763D0 (en) 1996-12-11 1996-12-11 Anti-static footwear
GB9625763 1996-12-11

Publications (2)

Publication Number Publication Date
EP0847707A2 true EP0847707A2 (fr) 1998-06-17
EP0847707A3 EP0847707A3 (fr) 1999-05-06

Family

ID=10804290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97309976A Withdrawn EP0847707A3 (fr) 1996-12-11 1997-12-10 Chaussure antistatique

Country Status (2)

Country Link
EP (1) EP0847707A3 (fr)
GB (2) GB9625763D0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1023850A1 (fr) * 1999-01-28 2000-08-02 Analco Auxiliar Calzado, S.A. Semelage antistatique pour chaussure
ES2200674A1 (es) * 2002-03-11 2004-03-01 Narciso Caballero S A Composicion antisestatica y procedimiento de obtencion de la misma por transformacion de sbs (estreno-butadieno-estireno) antiestatico.
WO2008119256A1 (fr) * 2007-03-29 2008-10-09 Xianneng Wan Chaussure antistatique
WO2008119257A1 (fr) * 2007-03-29 2008-10-09 Xianneng Wan Chaussure antistatique
WO2016042175A1 (fr) * 2014-09-19 2016-03-24 Luis Prades Gil Ensemble de semelle et de première de propreté pour article chaussant conductrices d'électricité

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2342665B (en) * 1998-10-13 2000-08-30 Mark Buyers Production optimisation tool

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB899389A (en) 1960-02-05 1962-06-20 Expanded Rubber Co Ltd Improvements in or relating to the production of expanded polyethylene
US3640915A (en) 1968-10-17 1972-02-08 Expanded Rubber & Plastics Ltd Production of foamed polyethylene

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879452A (en) * 1959-03-24 Goodrich Co B F Conductive article of footwear
US2279094A (en) * 1941-03-22 1942-04-07 Donnell Shoe Company O Conductive footwear
GB889022A (en) * 1957-08-22 1962-02-07 Btr Industries Ltd Improvements in polyvinyl chloride and like compositions
DE2750996A1 (de) * 1977-11-15 1979-05-17 Funck Herbert Antistatischer schuh mit polstersohle
CA1163672A (fr) * 1979-12-07 1984-03-13 Leslie I. Bloom Articles chaussants conducteurs d'electricite
JPS56131170A (en) * 1980-03-17 1981-10-14 Inoue Japax Res Non-charging buffer material
US4785371A (en) * 1986-11-28 1988-11-15 Interco Incorporated Electrostatic dissipating footwear
JP3031930B2 (ja) * 1989-12-05 2000-04-10 株式会社ブリヂストン 事務機器用ローラ
US5426870A (en) * 1991-05-17 1995-06-27 Phurness Pty. Ltd. Antistatic shoe sole
CA2076220A1 (fr) * 1991-12-12 1993-06-13 Spenco Medical Corporation Semelle conductrice
EP0626814B1 (fr) * 1992-02-17 1997-07-30 Footwear Innovations Limited Chaussure antistatique composee de polymeres intrinsequement conducteurs ou de leurs melanges
DE29505886U1 (de) * 1995-04-05 1996-08-01 W. L. Gore & Associates GmbH, 85640 Putzbrunn Sicherheitsschuh mit elektrisch leitendem Sohlenaufbau

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB899389A (en) 1960-02-05 1962-06-20 Expanded Rubber Co Ltd Improvements in or relating to the production of expanded polyethylene
US3640915A (en) 1968-10-17 1972-02-08 Expanded Rubber & Plastics Ltd Production of foamed polyethylene

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1023850A1 (fr) * 1999-01-28 2000-08-02 Analco Auxiliar Calzado, S.A. Semelage antistatique pour chaussure
ES2148110A1 (es) * 1999-01-28 2000-10-01 Analco Auxiliar Calzado S A Piso antiestatico para calzado.
ES2200674A1 (es) * 2002-03-11 2004-03-01 Narciso Caballero S A Composicion antisestatica y procedimiento de obtencion de la misma por transformacion de sbs (estreno-butadieno-estireno) antiestatico.
WO2008119256A1 (fr) * 2007-03-29 2008-10-09 Xianneng Wan Chaussure antistatique
WO2008119257A1 (fr) * 2007-03-29 2008-10-09 Xianneng Wan Chaussure antistatique
WO2016042175A1 (fr) * 2014-09-19 2016-03-24 Luis Prades Gil Ensemble de semelle et de première de propreté pour article chaussant conductrices d'électricité

Also Published As

Publication number Publication date
GB9625763D0 (en) 1997-01-29
GB2320176B (en) 2000-12-20
GB2320176A (en) 1998-06-17
GB9726122D0 (en) 1998-02-11
EP0847707A3 (fr) 1999-05-06

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