GB2286516A - Elastic pad suitable for use as anti-static shoe pad - Google Patents

Elastic pad suitable for use as anti-static shoe pad Download PDF

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Publication number
GB2286516A
GB2286516A GB9402030A GB9402030A GB2286516A GB 2286516 A GB2286516 A GB 2286516A GB 9402030 A GB9402030 A GB 9402030A GB 9402030 A GB9402030 A GB 9402030A GB 2286516 A GB2286516 A GB 2286516A
Authority
GB
United Kingdom
Prior art keywords
elastic pad
pad
granular foam
foam bodies
shoe
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
GB9402030A
Other versions
GB2286516B (en
GB9402030D0 (en
Inventor
Ching-Bing Chang
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.)
CHANG CHING BING
Original Assignee
CHANG CHING BING
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 CHANG CHING BING filed Critical CHANG CHING BING
Priority to GB9402030A priority Critical patent/GB2286516B/en
Publication of GB9402030D0 publication Critical patent/GB9402030D0/en
Publication of GB2286516A publication Critical patent/GB2286516A/en
Application granted granted Critical
Publication of GB2286516B publication Critical patent/GB2286516B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/35—Composite foams, i.e. continuous macromolecular foams containing discontinuous cellular particles or fragments
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
    • A43B17/14—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined made of sponge, rubber, or plastic materials
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
    • A43B3/00—Footwear characterised by the shape or the use
    • A43B3/16—Overshoes
    • A43B3/163—Overshoes specially adapted for health or hygienic purposes, e.g. comprising electrically conductive material allowing the discharge of electrostatic charges
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes

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

Abstract

An elastic pad suitable for use as an antistatic shoe pad is made of a foundation body composed of a plurality of granular foam bodies 20 held together by a polyurethane bonding agent 30. Each of the granular foam bodies contains therein a bonding layer 32 formed by the polyurethane bonding agent which permeates the granular foam body. The bonding layer of each of the granular foam bodies is provided thereon with an electrically conducting layer 40 formed by conducting particles. The elastic pad in its entirety is therefore provided with an electric conductivity. <IMAGE>

Description

Title ELASTIC PAD SUITABLE IN PARTICULAR FOR USE AS ANTI-STATIC SHOE PAD The present invention relates generally to a pad for use as an anti-static shoe pad, and more particularly to an elastic pad having a uniform distribution of electrical conductivity.
The Taiwanese Patent Number 77208512 discloses an electrically conductive shoe pad of a foam cotton material.
The shoe pad has a unique feature that it is provided with a conducting piece adhered to the lower surface of the shoe shank. The upper surface of the shoe shank and the conducting piece are then traversed by a plurality of conducting wires. Such prior art shoe pad as described above serves to provide the wearing comfort as well as the antistatic effect of eliminating the stationary electrical charges produced by the person wearing the shoe.
The shoe pad of the prior art described above is limited in that the anti-static effect of the shoe pad is circumscribed in view of the fact that the conducting piece and the conducting wires are distributed only in the shoe shank, and that the rest of the shoe sole remains nonconductive to the stationary electrical charges. As a result, the prior art shoe pad is incapable of eliminating the stationary electrical charges effectively and rapidly.
In addition, the conducting piece of the prior art shoe pad is generally made of a thin piece of aluminium or copper, which has a hardness greater than that of the foam cotton making up the shoe pad. This means that the shoe shank is less flexible than other areas of the shoe sole, thereby causing the discomfort to the person wearing the shoe for a long period of time.
It is therefore the primary objective of the present invention to provide an elastic pad with an anti-static effect of eliminating rapidly and effectively the stationary electrical charges produced by a person wearing the shoe.
It is another objective of the present invention to provide an elastic pad with an anti-static effect. The pad does not bring about a discomfort to a person who wears the shoe for a long period of time.
It is still another objective of the present invention to provide an anti-static pad with an anti-skidding effect.
The foregoing objectives of the present invention are attained by an elastic pad made of a foundation body made up of such ingredients as the previously formed foam materials, and the polyurethane bonding agent. The previously formed foam materials are impregnated with the polyurethane layer covered with a layer of uniformly distributed conducting particles. As a result, the elastic pad in its entirety is conductive to the stationary electrical charges. In other words, the conducting particles are distributed throughout the length, the width and the height of the elastic shoe pad making contact with the sole of a person who wears the shoe.
As a result, the elastic pad of the present invention is capable of eliminating rapidly and effectively the stationary electrical charges generated by the person wearing the shoe. In addition, the elasticity of the elastic pad of the present invention is by no means compromised by the presence of the conducting particles. Therefore, all portions of the elastic pad of the present invention are so uniformly flexible as to cause no discomfort to the sole of a person wearing the shoe.
The invention will now be described further by way of example with reference to the accompanying drawings in which: FIG. 1 shows a perspective view of a preferred embodiment of the present invention.
FIG. 2 shows a sectional view of a portion taken along the line 2-2 as shown in FIG. 1.
FIG. 3 shows an enlarged schematic view of a portion circled by A as shown in FIG. 2.
As shown in FIG. 1, an elastic pad 10 of the preferred embodiment of the present invention has a shape corresponding to the shape of the sole of a person. The elastic pad 10 has a toe portion 12, a heel portion 14, and a shank portion 16 located between the toe portion 12 and the heel portion 14 provided along the edge thereof with a raised portion 18.
As shown in FIG. 3, the elastic pad 10 is made of a foundation body made up of a plurality of granular foam bodies 20, which are held together securely by a bonding agent 30.
The granular foam bodies 20 range in size between 0.lmm and 5mm and are obtained from the previously formed foam material of polyurethane or other foam material. The granular foam bodies 20 are preferably dried after they are obtained in the comminuting process.
The bonding agent 30 is a polyurethane (PU) bonding agent made up of polyol, isocyanate, catalyst and additives, which are mixed in a predetermined ratio. In the process of making the elastic pad 10, the granular foam bodies 20 and the bonding agent 30 are mixed and stirred thoroughly so as to cause the bonding agent 30 to permeate the granular foam bodies 20 to form therein a PU layer 32, as shown in FIG.
3. The PU layer 32 serves to hold the granular foam bodies 20 together securely.
It must be noted here that the granular foam bodies 20 must be coated with an electrically conducting layer 40 made up of conducting particles, before they are mixed with the bonding agent 30. The electrically conducting layer 40 is made up of carbon powder. In other words, the conducting layer 40 of the granular foam bodies 20 is formed by mixing and stirring the granular foam bodies 20 with an appropriate quantity of carbon powder so that each of the granular foam bodies 20 is coated with a carbon layer of a predetermined thickness.
The elastic pad 10 is provided respectively in both sides thereof with a netted layer 50 of a fiber-reinforced material. The netted layer 50 is set firmly onto both sides of the foundation body of the elastic pad 10 in a hot mold.
It is apparent that the elastic pad 10 of the present invention contains therein in all directions the granular foam bodies 20, each of which is coated with an electrically conducting layer 40. As a result, the toe portion 12, the heel portion 14 and the shank portion 16 of the elastic pad 10 of the present invention are provided respectively with electrical conductivity. A shoe provided with the elastic pad 10 of the present invention is therefore capable of affording its wearer the wearing comfort and of eliminating rapidly and effectively the stationary electrical charges generated by the wearer thereof. Furthermore, the flexibility of the elastic pad 10 of the present invention is not undermined to any extent by the conducting layer 40.
Unlike the prior art shoe pad, the elastic pad 10 of the present invention comprises the toe portion 12, the heel portion 14 and the shank portion 16 which are all equally flexible. For this reason, a shoe provided with the elastic pad 10 of the present invention does not cause a wearing discomfort to a person who wears the shoe for a long period of time. The netted layer 50 of the elastic pad 10 of the present invention has dual effects of reinforcing the structural strength of the elastic pad 10 and of preventing the elastic pad 10 from skidding.
The embodiment of the present invention described above is to be regarded in all respects as merely illustrative and not restrictive. Accordingly, the present invention may be embodied in other specific forms without deviating from the spirit thereof. The present invention is therefore to be limited only by the scope of the following appended claims.

Claims (6)

1 An elastic pad suitable in particular for use as an anti static shoe pad and comprising: a foundation body made up of a plurality of granular foam bodies of a previously formed foam material and a polyurethane bonding agent; a bonding layer formed in each of said granular foam bodies by said polyurethane bonding agent permeating said each of said granular foam bodies; and an electrically conducting layer formed by conducting particles distributed on said bonding layer.
2 An elastic pad as claimed in claim 1 wherein said each of said granular foam bodies ranges in size between 0.lmm and 5mm.
3 An elastic pad as claimed in claim 1 wherein said granular foam bodies are obtained by comminuting a previously formed foam material of polyurethane.
4 An elastic pad as claimed in claim 1 wherein said polyurethane bonding agent is composed of polyol and isocyanate, which are mixed in a predetermined ratio.
5 An elastic pad as claimed in claim 1 wherein said conducting particles forming said electrically conducting layer are preferably carbon particles.
6 An elastic pad as claimed in claim 1 wherein said foundation body is provided onto at least one side thereof with a netted layer of fiber-reinforced material 7 An elastic pad substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB9402030A 1994-02-03 1994-02-03 Elastic pad suitable in particular for use as anti-static shoe pad Expired - Fee Related GB2286516B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9402030A GB2286516B (en) 1994-02-03 1994-02-03 Elastic pad suitable in particular for use as anti-static shoe pad

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9402030A GB2286516B (en) 1994-02-03 1994-02-03 Elastic pad suitable in particular for use as anti-static shoe pad

Publications (3)

Publication Number Publication Date
GB9402030D0 GB9402030D0 (en) 1994-03-30
GB2286516A true GB2286516A (en) 1995-08-23
GB2286516B GB2286516B (en) 1998-08-05

Family

ID=10749766

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9402030A Expired - Fee Related GB2286516B (en) 1994-02-03 1994-02-03 Elastic pad suitable in particular for use as anti-static shoe pad

Country Status (1)

Country Link
GB (1) GB2286516B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020027A1 (en) * 2000-04-22 2001-10-25 Hanno Werk Gmbh & Co Kg Device for conducting static electricity away from automobile seats takes the form of an impregnated, electrically conductive foam layer located between the seat cover and the cushioning material
US8434267B2 (en) 2005-11-18 2013-05-07 Henniges Automotive Sealing Systems North America Inc. Sealing strip for vehicle window and method of making it

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821135A (en) * 1965-09-29 1974-06-28 Cushioned Prod Corp Granular cork-polyurethane composition and products thereof
US3894973A (en) * 1974-03-19 1975-07-15 Du Pont Use of pneumacel in rebonded structures comprising polyurethane scrap
US4014826A (en) * 1974-03-19 1977-03-29 E. I. Du Pont De Nemours And Company Process for preparing rebonded foam structures
US4185146A (en) * 1978-11-15 1980-01-22 The General Tire & Rubber Company Polyurethane binder composition containing a rubber extender oil and a finely divided solid soybean derivative
US4315996A (en) * 1979-12-07 1982-02-16 Metzeler Schaum Gmbh Method for the manufacture of composite foam materials
US4839393A (en) * 1988-07-08 1989-06-13 Wm. T. Burnett & Co., Inc. Polyurethane foams containing organofunctional silanes
US4926570A (en) * 1987-07-22 1990-05-22 Lohmann Gmbh & Co. Kg Shoe inner sole, particularly insole or welt
WO1993015624A1 (en) * 1992-02-17 1993-08-19 Footwear Innovations Limited Antistatic footwear of intrinsically conductive polymers or blends thereof

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821135A (en) * 1965-09-29 1974-06-28 Cushioned Prod Corp Granular cork-polyurethane composition and products thereof
US3894973A (en) * 1974-03-19 1975-07-15 Du Pont Use of pneumacel in rebonded structures comprising polyurethane scrap
US4014826A (en) * 1974-03-19 1977-03-29 E. I. Du Pont De Nemours And Company Process for preparing rebonded foam structures
US4185146A (en) * 1978-11-15 1980-01-22 The General Tire & Rubber Company Polyurethane binder composition containing a rubber extender oil and a finely divided solid soybean derivative
US4315996A (en) * 1979-12-07 1982-02-16 Metzeler Schaum Gmbh Method for the manufacture of composite foam materials
US4926570A (en) * 1987-07-22 1990-05-22 Lohmann Gmbh & Co. Kg Shoe inner sole, particularly insole or welt
US4926570B1 (en) * 1987-07-22 1996-03-19 Lohmann Gmbh & Co Kg Shoe inner sole particularly insole or welt
US4839393A (en) * 1988-07-08 1989-06-13 Wm. T. Burnett & Co., Inc. Polyurethane foams containing organofunctional silanes
WO1993015624A1 (en) * 1992-02-17 1993-08-19 Footwear Innovations Limited Antistatic footwear of intrinsically conductive polymers or blends thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10020027A1 (en) * 2000-04-22 2001-10-25 Hanno Werk Gmbh & Co Kg Device for conducting static electricity away from automobile seats takes the form of an impregnated, electrically conductive foam layer located between the seat cover and the cushioning material
US8434267B2 (en) 2005-11-18 2013-05-07 Henniges Automotive Sealing Systems North America Inc. Sealing strip for vehicle window and method of making it

Also Published As

Publication number Publication date
GB2286516B (en) 1998-08-05
GB9402030D0 (en) 1994-03-30

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040203