US20160183611A1 - A latex article with static dissipating property - Google Patents
A latex article with static dissipating property Download PDFInfo
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- US20160183611A1 US20160183611A1 US14/911,902 US201414911902A US2016183611A1 US 20160183611 A1 US20160183611 A1 US 20160183611A1 US 201414911902 A US201414911902 A US 201414911902A US 2016183611 A1 US2016183611 A1 US 2016183611A1
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- article
- latex
- glove
- article according
- static
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- 230000003068 static effect Effects 0.000 title claims abstract description 33
- 229920000126 latex Polymers 0.000 title claims description 19
- 239000004816 latex Substances 0.000 title claims description 18
- 150000002825 nitriles Chemical class 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 14
- 229920000459 Nitrile rubber Polymers 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 244000043261 Hevea brasiliensis Species 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 229920003052 natural elastomer Polymers 0.000 claims description 5
- 229920001194 natural rubber Polymers 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 3
- 239000005060 rubber Substances 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims 4
- 239000004020 conductor Substances 0.000 claims 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000006185 dispersion Substances 0.000 claims 1
- 239000000806 elastomer Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 claims 1
- 229920001084 poly(chloroprene) Polymers 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 claims 1
- 239000011343 solid material Substances 0.000 claims 1
- 238000005507 spraying Methods 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- 229940110781 sulfur / zinc oxide Drugs 0.000 claims 1
- 229920002725 thermoplastic elastomer Polymers 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000007592 spray painting technique Methods 0.000 abstract description 2
- 230000035939 shock Effects 0.000 abstract 1
- 239000002216 antistatic agent Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 229920000642 polymer Polymers 0.000 description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 8
- 239000011231 conductive filler Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 6
- 239000003575 carbonaceous material Substances 0.000 description 5
- 229920001940 conductive polymer Polymers 0.000 description 5
- 239000005864 Sulphur Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000011787 zinc oxide Substances 0.000 description 4
- 239000000701 coagulant Substances 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000002105 nanoparticle Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002322 conducting polymer Substances 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000004100 electronic packaging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000003811 finger Anatomy 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000012633 leachable Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001197 polyacetylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 229920000123 polythiophene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011527 polyurethane coating Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D19/00—Gloves
- A41D19/0055—Plastic or rubber gloves
- A41D19/0058—Three-dimensional gloves
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D19/00—Gloves
- A41D19/0055—Plastic or rubber gloves
-
- A41D31/0066—
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/26—Electrically protective, e.g. preventing static electricity or electric shock
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D2400/00—Functions or special features of garments
- A41D2400/52—Disposable
Definitions
- the invention relates latex articles specifically, gloves which have the ability to dissipate static charge.
- Industrially electrostatic dissipating gloves are used in automotive industries, in spray painting and electronic industry. Gloves that are currently in the market for the spray paint industry are mostly supported gloves most commonly with a polyurethane coating or gloves which have an electrical wire and other metal attachments that disperse electrical charge. Many of these gloves are cumbersome to the wearer due to the presence of external parts attached to it and some gloves are not quite comfortable to the wearer.
- the gloves used in the electronics industry are much thinner and are normally polyurethane coated nylon or dyneema gloves.
- Static electricity is generated whenever dissimilar materials move or abrade against another object.
- the capacity to generate static electricity of a substance depends on the condition of the surface material the objects are made out of, the dielectric constant, surface resistance and relative humidity. Further, since charge capacity is directly proportional to surface resistivity, a material with a higher surface resistivity will generate a greater static charge. Therefore in situations where static charge is generated to dissipate the charge a material with low surface resistance would be needed. The aim was to develop a product which has a lower surface resistance which will subsequently dissipate static charge.
- Electrostatic property can be incorporated to a glove in three ways, either by incorporating chemical additives, conductive fillers or by incorporating an inherent dissipating or conductive polymers.
- antistatic agents are usually antistatic agents; these can be either external or internal antistatic agents. External antistatic agents can be sprayed or coated into the finished article, while internal antistats are partially or completely dissolved in the latex compound. The antistat slowly “blooms” or migrate to surface and becomes electrically active.
- antistatic agents have two halves of opposite chemical nature—a hydrophilic head and a hydrophobic tail. The hydrophobic tail avoids water but interacts with polymer. The hydrophilic head stays above surface, so antistat remains half submerged and half exposed. The hydrophilic end attracts moisture from the environment onto the plastic surface and forms a conductive layer on the surface. The conductive layer allows electric charge to flow and helps static dissipation.
- the second method of introducing electrical conductivity to latex articles is by incorporating a conductive filler.
- Conductive fillers can be metal particles, metal coated glass, carbon fibers, silver powder, carbon powder or other carbonaceous materials such as graphite.
- the factors to be considered are particle conductivity, loading level and particle shape.
- the critical point is called the percolation threshold where majority of filler particles are in contact with at least two of their nearest neighbors, thereby forming a continuous chain or network. Electrical charge passes through the composite via this network.
- inherently dissipating or conducting polymers usage of inherently dissipating or conducting polymers is the third method that can be used to incorporate static dissipation to an article.
- Inherently static dissipating polymers are generally blended with a host polymer. When blended the inherently dissipating polymers form a separate interpenetrating network within the host polymer.
- the advantage of using inherently dissipating polymers is its less likeness to migrate or leach out, hence can be used in clean room applications. These type of polymers are independent of atmospheric humidity unlike the antistatic agents.
- the polymer chain provides the conductive path for the electrons.
- This patent refers to use of special fillers to impart the ESD properties (electrostatic charge dissipating properties) to a glove.
- U.S. Pat. No. 2,008,007 refers to a static dissipative article which had been made with a coating that comprises a surface functionalized nanoparticle component having quaternary ammine groups which acts as antistatic agents on the surface of the nanoparticles. Since the quaternary amine groups are bound to the nanoparticles migration and blooming found in typical antistatic agents is not there.
- Another patent U.S. Pat. No. 5,609,969 refers to a static dissipative packaging article comprising a coating containing vanadium pentoxide, a polymer latex having a hydrophilic functionality and a nonsulfonated protective binder, this acts as an antistatic coating over an insulative polymer resin.
- U.S. Pat. No. 4,828,756 refers to an electrically conductive composite comprising a conductive composite polyacetylene moiety, a nonconductive high nitrile resin and a dopant.
- the electrically conductive composite is prepared by insitu polymerization, it comprises the reactive products of the high nitrile resin and conductive organic polymer.
- U.S. patent application 200803006200A1 refers to elastomeric articles specifically gloves made from a nitrile/natural rubber blend the surface resistance below 10 4 ⁇ /sq and static decay time of less than 60 seconds.
- Natural rubber has been used to provide good softness and tactile sensitivity properties, however Natural Rubber does not exhibit good static resistivity. It has an outer layer that possesses antistatic properties and an inner layer that provides desired comfort and feel.
- Nitrile rubber is considered as a non-leachable polymeric antistatic agent, natural rubber is blended with nitrile rubber to make the polymer blend to provide antistatic property.
- U.S. Pat. No. 4,769,856 refers to a antistatic fabric supported glove made with a cutout of thin antistatic polyvinyl chloride film. The cutout is adhered to the fabric using an adhesive or by stitching. The cut out covers the palm, inner thumb and finger areas of the hand This glove can be used to handle vinyl phonograph records and other objects which can be damaged by static electricity.
- U.S. Pat. No. 3,594,222 relates to latex articles that uses lithium chloride as an antistatic agent in rubber latex. This is particularly used for carpets the face of which is made from fibrous textile material which tends to accumulate static charge as a result of friction on its surface. The charge can be dissipated and greatly reduced due to the antistatic agent in the latex.
- the present invention refers to a latex article specifically a glove made of nitrile rubber which has the ability to dissipate static charge.
- the nitrile rubber can be made according to a standard mix of sulphur/accelerator/zinc oxide formulation.
- the elastomeric article and in particularly the glove is formed by an unlined elastomeric layer of a composition comprising a nitrile rubber, particularly according to the above known standard mixture and a conductive filler.
- the article and particularly the glove can be fabricated by using conventional dipping technology.
- the unlined nitrile glove which helps to reduce the surface conductivity of the glove and subsequently help the dissipation of static charge which could accumulate due to triboelectric action thanks to the conductive filler. Apart from being static dissipative this glove is economical, comfortable to the wearer and has good chemical resistance.
- This fully dipped unlined nitrile glove can be specially used in industries where paint is sprayed where static charge builds up while holding the appliance due to triboelectric action.
- the glove has been formulated to dissipate static charge as it forms along the glove and allowed to be earthed through human body.
- the static dissipative nitrile article and particularly the glove is made using nitrile rubber, standard sulphur/accelerator/zinc oxide formulations with a conductive filler composed of carbon and carbonaceous materials.
- the said conductive filler is provided in a quantity of 2.1% to 7.4% in weight of the standard mixture of nitrile rubber, standard sulphur/accelerator, zinc oxide, preferably in the range of 6.7% to 7.1% in weight.
- Typical carbon and carbonaceous materials which can be used alone or in combination are carbon composites and graphite.
- a typical non limiting example of a formulation of the said nitrile rubber mixture is:
- the article is obtained using a coagulant dipping process which is followed by leaching and curing cycles.
- a clean, preheated mold more specifically a former is dipped into a coagulant that comprises of calcium nitrate and dried.
- the coagulant coated former is dipped into a latex compound that is has been compounded with all the necessary ingredients to form a glove.
- glove is cured and subsequently leached to remove the salt, dried and chlorinated.
- the term “surface resistivity” is defined as the resistance measured on the surface of a material. Electrodes are placed on the surface of the material, a voltage is applied and resistance between the electrodes is measured. The ability of a material to discharge static electricity is classified according to its static resistivity. Static charge decay time measures the ability of a grounded material to dissipate a charge induced on its surface. As per the standard EN 1149 an electrostatic dissipative material should have a static decay time less than 4 seconds and a surface resistance less than or equal to 2.5 ⁇ 10 9 . The glove developed met the above requirements and complies with EN 1149.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Gloves (AREA)
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
Abstract
An elastomeric article, specifically an unsupported glove with two layers where the outer layer has ESD properties and its method of manufacturing is described here. The outer layer is especially formulated with a combination of fillers to reduce the surface resistance and volume resistance and helps to dissipate static charge which builds up as a result of triboelectric action. The wearer of this glove will not get any shock due to static charge which is experienced when wearing a conventional nitrile glove specially in applications such as spray painting
Description
- The invention relates latex articles specifically, gloves which have the ability to dissipate static charge. Industrially electrostatic dissipating gloves are used in automotive industries, in spray painting and electronic industry. Gloves that are currently in the market for the spray paint industry are mostly supported gloves most commonly with a polyurethane coating or gloves which have an electrical wire and other metal attachments that disperse electrical charge. Many of these gloves are cumbersome to the wearer due to the presence of external parts attached to it and some gloves are not quite comfortable to the wearer.
- The gloves used in the electronics industry are much thinner and are normally polyurethane coated nylon or dyneema gloves.
- Static electricity is generated whenever dissimilar materials move or abrade against another object. The capacity to generate static electricity of a substance depends on the condition of the surface material the objects are made out of, the dielectric constant, surface resistance and relative humidity. Further, since charge capacity is directly proportional to surface resistivity, a material with a higher surface resistivity will generate a greater static charge. Therefore in situations where static charge is generated to dissipate the charge a material with low surface resistance would be needed. The aim was to develop a product which has a lower surface resistance which will subsequently dissipate static charge. Electrostatic property can be incorporated to a glove in three ways, either by incorporating chemical additives, conductive fillers or by incorporating an inherent dissipating or conductive polymers.
- The chemical additives added are usually antistatic agents; these can be either external or internal antistatic agents. External antistatic agents can be sprayed or coated into the finished article, while internal antistats are partially or completely dissolved in the latex compound. The antistat slowly “blooms” or migrate to surface and becomes electrically active. Generally antistatic agents have two halves of opposite chemical nature—a hydrophilic head and a hydrophobic tail. The hydrophobic tail avoids water but interacts with polymer. The hydrophilic head stays above surface, so antistat remains half submerged and half exposed. The hydrophilic end attracts moisture from the environment onto the plastic surface and forms a conductive layer on the surface. The conductive layer allows electric charge to flow and helps static dissipation. Although this is a cheap and an efficient way to introduce conductivity to latex articles this has a disadvantage that it could leach out during processing or remove by rubbing and washing overtime. The conductivity occurring this way varies with humidity, further due to the greasy feel on the surface antistatic agents incorporated articles may not be suitable for cleanroom applications due to the chemical contamination it could impart. Antistatic agents are used in applications such as vinyl and rubber work surfaces, polyethylene bags, polypropylene containers/trays and rubber mats.
- The second method of introducing electrical conductivity to latex articles is by incorporating a conductive filler. Conductive fillers can be metal particles, metal coated glass, carbon fibers, silver powder, carbon powder or other carbonaceous materials such as graphite. When using conductive fillers the factors to be considered are particle conductivity, loading level and particle shape. At low filler loading, the composite properties remain undisturbed as the filler loading reaches a critical point, the resistivity suddenly drops. The critical point is called the percolation threshold where majority of filler particles are in contact with at least two of their nearest neighbors, thereby forming a continuous chain or network. Electrical charge passes through the composite via this network.
- Usage of inherently dissipating or conducting polymers is the third method that can be used to incorporate static dissipation to an article. Inherently static dissipating polymers are generally blended with a host polymer. When blended the inherently dissipating polymers form a separate interpenetrating network within the host polymer. The advantage of using inherently dissipating polymers is its less likeness to migrate or leach out, hence can be used in clean room applications. These type of polymers are independent of atmospheric humidity unlike the antistatic agents. When using inherently conductive polymers, the polymer chain provides the conductive path for the electrons. This happens as a result of the dramatic changes on the polymer architecture such as double bonds, conjugation and doping which can change the electronic structure by oxidation and reduction. The disadvantages of using conductive polymers are the loss of stability and conductivity under ambient conditions, having poor mechanical properties and poor processability. Examples of such polymers are polyanilene, polypyrrole and polythiophene. Inherently conductive polymers are used for coating materials for films and electronic packaging.
- This patent refers to use of special fillers to impart the ESD properties (electrostatic charge dissipating properties) to a glove.
- U.S. Pat. No. 2,008,007 refers to a static dissipative article which had been made with a coating that comprises a surface functionalized nanoparticle component having quaternary ammine groups which acts as antistatic agents on the surface of the nanoparticles. Since the quaternary amine groups are bound to the nanoparticles migration and blooming found in typical antistatic agents is not there.
- Another patent U.S. Pat. No. 5,609,969 refers to a static dissipative packaging article comprising a coating containing vanadium pentoxide, a polymer latex having a hydrophilic functionality and a nonsulfonated protective binder, this acts as an antistatic coating over an insulative polymer resin.
- U.S. Pat. No. 4,828,756 refers to an electrically conductive composite comprising a conductive composite polyacetylene moiety, a nonconductive high nitrile resin and a dopant. The electrically conductive composite is prepared by insitu polymerization, it comprises the reactive products of the high nitrile resin and conductive organic polymer.
- U.S. patent application 200803006200A1 refers to elastomeric articles specifically gloves made from a nitrile/natural rubber blend the surface resistance below 104 Ω/sq and static decay time of less than 60 seconds. Natural rubber has been used to provide good softness and tactile sensitivity properties, however Natural Rubber does not exhibit good static resistivity. It has an outer layer that possesses antistatic properties and an inner layer that provides desired comfort and feel. Nitrile rubber is considered as a non-leachable polymeric antistatic agent, natural rubber is blended with nitrile rubber to make the polymer blend to provide antistatic property.
- U.S. Pat. No. 4,769,856 refers to a antistatic fabric supported glove made with a cutout of thin antistatic polyvinyl chloride film. The cutout is adhered to the fabric using an adhesive or by stitching. The cut out covers the palm, inner thumb and finger areas of the hand This glove can be used to handle vinyl phonograph records and other objects which can be damaged by static electricity.
- U.S. Pat. No. 3,594,222 relates to latex articles that uses lithium chloride as an antistatic agent in rubber latex. This is particularly used for carpets the face of which is made from fibrous textile material which tends to accumulate static charge as a result of friction on its surface. The charge can be dissipated and greatly reduced due to the antistatic agent in the latex.
- It is an objective of the present invention to provide for an elastomeric article, particularly a glove, which overcomes the drawbacks of the above cited articles according to the state of the art, and particularly for allowing to provide for an article and a method for its fabrication which are fast, cheap and easy to carry out. Furthermore the elastomeric article is stable relating to its mechanical and antistatic properties and easy to dress and wear.
- The present invention refers to a latex article specifically a glove made of nitrile rubber which has the ability to dissipate static charge. The nitrile rubber can be made according to a standard mix of sulphur/accelerator/zinc oxide formulation.
- According to a first feature of the present invention the elastomeric article and in particularly the glove is formed by an unlined elastomeric layer of a composition comprising a nitrile rubber, particularly according to the above known standard mixture and a conductive filler.
- The article and particularly the glove can be fabricated by using conventional dipping technology.
- The unlined nitrile glove, according to the invention and which helps to reduce the surface conductivity of the glove and subsequently help the dissipation of static charge which could accumulate due to triboelectric action thanks to the conductive filler. Apart from being static dissipative this glove is economical, comfortable to the wearer and has good chemical resistance. This fully dipped unlined nitrile glove can be specially used in industries where paint is sprayed where static charge builds up while holding the appliance due to triboelectric action. The glove has been formulated to dissipate static charge as it forms along the glove and allowed to be earthed through human body.
- According to a first generic non limiting example the static dissipative nitrile article and particularly the glove is made using nitrile rubber, standard sulphur/accelerator/zinc oxide formulations with a conductive filler composed of carbon and carbonaceous materials.
- The said conductive filler is provided in a quantity of 2.1% to 7.4% in weight of the standard mixture of nitrile rubber, standard sulphur/accelerator, zinc oxide, preferably in the range of 6.7% to 7.1% in weight. Typical carbon and carbonaceous materials which can be used alone or in combination are carbon composites and graphite.
- A typical non limiting example of a formulation of the said nitrile rubber mixture is:
-
- Nitrile rubber 100% in weight of the glove
- sulphur 1.3% in weight of the glove
- Accelerator 1.14% in weight of the glove
- zinc oxide 4.4% in weight of the glove
- The article is obtained using a coagulant dipping process which is followed by leaching and curing cycles. In this process a clean, preheated mold, more specifically a former is dipped into a coagulant that comprises of calcium nitrate and dried. Then the coagulant coated former is dipped into a latex compound that is has been compounded with all the necessary ingredients to form a glove. Then glove is cured and subsequently leached to remove the salt, dried and chlorinated.
- Then the surface resistance and the static charge decay time of the glove was measured. The term “surface resistivity” is defined as the resistance measured on the surface of a material. Electrodes are placed on the surface of the material, a voltage is applied and resistance between the electrodes is measured. The ability of a material to discharge static electricity is classified according to its static resistivity. Static charge decay time measures the ability of a grounded material to dissipate a charge induced on its surface. As per the standard EN 1149 an electrostatic dissipative material should have a static decay time less than 4 seconds and a surface resistance less than or equal to 2.5×109. The glove developed met the above requirements and complies with EN 1149.
Claims (13)
1. A dipped elastomeric article made of a latex monolayer, the said layer having static charge dissipating property.
2. The article according to claim 1 in which the said latex monolayer is provided with a filler of conductive materials.
3. The article according to claim 1 wherein it can be made out of elastomers made of nitrile rubber, natural rubber, neoprene, its blends or any other rubbers, SBR, Butyl, PVC, Silicon rubber, flouroelastomers.
4. The article according to claim 1 wherein the elastomeric latex monolayer consists of nitrile latex which is a copolymer of butadiene and acrylonitrile.
5. The article according to claim 1 in which the elastomeric latex monolayer consists of nitrile latex, standard accelerator/sulfur/zinc oxide compositions, compositions which include non-sulfur/accelerator compositions and thermoplastic elastomers along with electrically conductive material.
6. The article according to claim 1 in which of electrically conductive material comprises at least one carbon composite.
7. The article as claimed in claim 5 wherein the carbon composite is added as dispersion to the latex compound similar to any other solid material added to a latex composition
8. An article according to claim 1 in which the said article is unlined.
9. The article according to claim 1 in which the said article is a glove.
10. The article as claimed in claim 8 wherein the said article is a disposable glove, flocklined gloves or a fabric supported glove.
11. Use of the article according to claim 8 characterized in that the said article is used for applications where static electricity is formed through triboelectric actions on articles which handle during spraying techniques or other techniques in order to dissipate static electricity.
12. The article according to claim 1 characterized in that the whole article, or the compounds used to make this article used to make conducting base and/or conductive pads or conductive pens for touch screen gloves.
13. The glove according to claim 1 characterized by the following properties.
Surface resistance : 7.81×104 Ω/sq
Static charge decay time : <0.01 Sees
Tensile Strength : 25-27
Modulus at 50% : 2.0-2.2%
Modulus at 100% : 3.0-3.2%
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LK17292 | 2013-08-12 | ||
| LK1729213 | 2013-08-12 | ||
| PCT/IB2014/063291 WO2015022590A1 (en) | 2013-08-12 | 2014-07-22 | A latex article with static dissipating property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US20160183611A1 true US20160183611A1 (en) | 2016-06-30 |
Family
ID=52468094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US14/911,902 Abandoned US20160183611A1 (en) | 2013-08-12 | 2014-07-22 | A latex article with static dissipating property |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20160183611A1 (en) |
| WO (1) | WO2015022590A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180092414A1 (en) * | 2013-12-13 | 2018-04-05 | Covco Ltd. | Ambidextrous fish scale-textured glove |
| WO2019046906A1 (en) * | 2017-09-11 | 2019-03-14 | Skinprotect Corporation Sdn Bhd | Synthetic elastomeric article and methods for producing thereof |
| US10479874B1 (en) * | 2018-02-15 | 2019-11-19 | Shimon Amdur | Latex compositions and antistatic articles manufactured therefrom |
| DE102019118802A1 (en) * | 2019-07-11 | 2021-01-14 | W + R Gmbh | Dissipative glove and method for manufacturing a dissipative glove |
| CN113950407A (en) * | 2019-05-31 | 2022-01-18 | 优维科斯安全手套有限责任两合公司 | Protective gloves capable of dissipating static electricity |
| WO2022064355A1 (en) * | 2020-09-24 | 2022-03-31 | Dipped Products Plc | Percolative surface textured polymeric latex coating for a fabric supported glove and method of making |
| US20230049299A1 (en) * | 2017-12-21 | 2023-02-16 | Medline Industries, Lp | Disposable gloves and methods of using and making |
| US11700894B2 (en) | 2013-12-13 | 2023-07-18 | Covco (H.K.) Limited | Ambidextrous fish scale-textured glove |
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| CN105029780A (en) * | 2015-08-21 | 2015-11-11 | 无锡市东北塘永丰橡塑厂 | Oil-stain-resisting rubber gloves |
| CN106633932A (en) * | 2016-12-11 | 2017-05-10 | 钦州学院 | Touch screen glove and preparation method thereof |
| CN107048543A (en) * | 2017-06-13 | 2017-08-18 | 芜湖桑乐金电子科技有限公司 | A kind of Far-infrared health-care glove |
| CN113576083B (en) * | 2021-08-04 | 2025-03-11 | 苏州日月星辰静电净化技术有限公司 | Anti-static functional gloves |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088024A1 (en) * | 2000-05-16 | 2001-11-22 | Dow Global Technologies Inc. | Polymeric films having anti-static properties |
| JP3587820B2 (en) * | 2002-05-01 | 2004-11-10 | ショーワ株式会社 | Antistatic rubber latex composition and antistatic rubber glove |
| JP2006257610A (en) * | 2005-03-14 | 2006-09-28 | Hiroshi Inoue | Method for producing static electricity charge-preventive natural rubber latex composition, natural rubber glove and finger suck |
| KR200435512Y1 (en) * | 2006-09-27 | 2007-01-26 | 우진에이씨티주식회사 | Conductive Gloves for Clean Rooms with Breathable Film |
| US20120090075A1 (en) * | 2010-10-15 | 2012-04-19 | Andrea Barbara Piesker | Chemical resistant, mechanical resistant, anti-static glove |
-
2014
- 2014-07-22 US US14/911,902 patent/US20160183611A1/en not_active Abandoned
- 2014-07-22 WO PCT/IB2014/063291 patent/WO2015022590A1/en not_active Ceased
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180092414A1 (en) * | 2013-12-13 | 2018-04-05 | Covco Ltd. | Ambidextrous fish scale-textured glove |
| US11700894B2 (en) | 2013-12-13 | 2023-07-18 | Covco (H.K.) Limited | Ambidextrous fish scale-textured glove |
| US11241051B2 (en) * | 2014-07-08 | 2022-02-08 | Covco (H.K.) Limited | Ambidextrous fish scale-textured glove |
| WO2019046906A1 (en) * | 2017-09-11 | 2019-03-14 | Skinprotect Corporation Sdn Bhd | Synthetic elastomeric article and methods for producing thereof |
| US12433358B2 (en) * | 2017-12-21 | 2025-10-07 | Medline Industries, Lp | Disposable gloves and methods of using and making |
| US20230049299A1 (en) * | 2017-12-21 | 2023-02-16 | Medline Industries, Lp | Disposable gloves and methods of using and making |
| US10479874B1 (en) * | 2018-02-15 | 2019-11-19 | Shimon Amdur | Latex compositions and antistatic articles manufactured therefrom |
| JP2024016291A (en) * | 2019-05-31 | 2024-02-06 | ウベックス セーフティ グローブ ゲーエムベーハー ウント コー カーゲー | static dissipative protective gloves |
| CN113950407A (en) * | 2019-05-31 | 2022-01-18 | 优维科斯安全手套有限责任两合公司 | Protective gloves capable of dissipating static electricity |
| US20220232912A1 (en) * | 2019-05-31 | 2022-07-28 | Uvex Safety Gloves Gmbh & Co. Kg | Electrostatically dissipative protective glove and method of production |
| JP2022536038A (en) * | 2019-05-31 | 2022-08-12 | ウベックス セーフティ グローブ ゲーエムベーハー ウント コー カーゲー | static dissipative protective gloves |
| DE102019118802A1 (en) * | 2019-07-11 | 2021-01-14 | W + R Gmbh | Dissipative glove and method for manufacturing a dissipative glove |
| EP3763234B1 (en) * | 2019-07-11 | 2025-04-30 | W+R GmbH | Conductive glove and method for producing same |
| US12378725B2 (en) | 2020-09-24 | 2025-08-05 | Dipped Products Plc | Percolative surface textured polymeric latex coating for a fabric supported glove and method of making |
| WO2022064355A1 (en) * | 2020-09-24 | 2022-03-31 | Dipped Products Plc | Percolative surface textured polymeric latex coating for a fabric supported glove and method of making |
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| Publication number | Publication date |
|---|---|
| WO2015022590A1 (en) | 2015-02-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AS | Assignment |
Owner name: DIPPED PRODUCTS PLC, SRI LANKA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DANGALLA, HASINI;NETHSINGHE, LAKSHMAN;FERNANDO, K.A.L.S.;REEL/FRAME:039134/0310 Effective date: 20160708 |
|
| STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |