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
  • A41D19/0065—Three-dimensional gloves with a textile layer underneath
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
  • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
  • B29C41/14—Dipping a core
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
  • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
  • B29C41/20—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. moulding inserts or for coating articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
  • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
  • B29C41/22—Making multilayered or multicoloured articles

Definitions

• the present invention relates to a glove of increased strength and to its manufacturing process, as well as to the uses of such a glove.
• High-strength fabrics such as those formed from KEVLAR® fibers or from DYNEEMA® fibers (from DSM), constitute particularly suitable materials for producing such gloves.
• Patent EP 0 716 817 in the name of Hutchinson discloses gloves affording high protection against the risk of cutting, which comprise, on that side of the glove intended to cover the palm of one's hand, a material having a high cut resistance (such as a knit of para-aramid fibers), whereas that side of the glove intended to cover the back of one's hand is formed from an elastic fabric of natural or synthetic organic fibers (such as a knit of cotton fibers), all or part of the external surface of the glove being coated with an elastomer.
• a material having a high cut resistance such as a knit of para-aramid fibers
• an elastic fabric of natural or synthetic organic fibers such as a knit of cotton fibers
• Patent EP 0 716 817 discloses the coating of a fabric only with elastomers in the form of aqueous dispersions, by successively dipping the fabric into these aqueous dispersions.
• dipping a fabric directly into an elastomer solution is in fact to be prohibited, since it would involve, owing to the high penetrability of elastomer solutions, complete inclusion of the fabric (over its entire thickness) in the elastomer. This would result in a loss of pliancy of the fabric.
• the gloves thus obtained would be particularly uncomfortable for the user to wear and their lack of pliancy would make them unsuitable for following the movements of one's hand and fingers.
• the subject of the invention is therefore a high-strength glove which comprises, from the inside of the glove toward the outside:
• the fabric layer being covered, over part or all of its surface, with at least one layer of an elastomer chosen from an aqueous dispersion of said elastomer;
• the elastomer layer being covered, over part or all of its surface, with at least one layer of an elastomer obtained from a solution of said elastomer in one or more organic solvents or in water.
• elastomer solution is understood to mean an elastomer in liquid form having only a single continuous phase, as opposed to aqueous elastomer dispersions (or lattices) which are, on a microscopic level, in the form of two separate phases.
• aqueous elastomer dispersions that can be used within the context of the present invention are dispersions which can be coagulated, with the aid of coagulants commonly used in the field of elastomers, or aqueous dispersions which are rheologically modified so as to increase their viscosity.
• outside of the glove is understood to mean that side of the glove intended to come into contact with the user's hand, whereas the term “outside” of the glove is that side intended to come into contact with the external environment.
• high-strength fabric is understood to mean a fabric possessing good puncture resistance and tear resistance, these being determined according to the NF EN 388 standard. As regards the level of cut resistance, this depends on the nature of the fabric chosen, on the diameter of the fibers and on the size of the mesh structures of the fabric, if the fibers of the fabric are knitted.
• the levels of puncture resistance, cut resistance and tear resistance involve different mechanical characteristics, since they correspond to the resistance to mechanical stresses of different types, namely, respectively, resistance to contact with a pointed object, resistance to contact with a cutting object and the ability of a specimen with a notch of not tearing any further from this notch.
• the presence of at least one layer of an elastomer, the layer being obtained from an aqueous dispersion of the elastomer, in an intermediate position between the fabric layer and the elastomer layer(s) obtained from solutions makes it possible to prevent the elastomer in solution form from penetrating the entire thickness of the fabric layer.
• the resulting glove remains pliant, while still being made impermeable by elastomer layers obtained from solution.
• the high-strength fabric used in the gloves according to the invention consists, for example, of woven or knitted, natural or synthetic fibers selected from high-tenacity polyethylene fibers, high-tenacity polyester fibers, polyaramid fibers, polyamide fibers, or viscose fibers, or blends of the preceding.
• the elastomer obtained from an aqueous dispersion is selected from natural rubber, polychloroprenes, carboxylated nitrile rubbers, polyurethanes, or blends of the preceding.
• the elastomer obtained from a solution in one or more organic solvents or in water can be advantageously selected from polyurethanes, butyl rubbers, chlorosulfonated polyethylenes (for example the product sold under the brand name HYPALON® by DuPont De Nemours, France), or polyvinyl alcohols, or blends of the preceding.
• organic solvents can be advantageously selected from polyurethanes, butyl rubbers, chlorosulfonated polyethylenes (for example the product sold under the brand name HYPALON® by DuPont De Nemours, France), or polyvinyl alcohols, or blends of the preceding.
• the latter possesses high chemical resistance, the elastomer obtained from a solution in one or more organic solvents or in water.
• the organic solvents can be butyl rubbers, chlorosulfonated polyethylenes, or polyvinyl alcohols or blends of the preceding.
• Butyl rubbers make it possible in fact to obtain a glove impermeable to gases, whereas chlorosulfonated polyethylenes and polyvinyl alcohols give the glove excellent impermeability to liquids (water, oils, solvents). Any other elastomer in solution exhibiting chemical resistance properties could also be used.
• the expression “glove with high chemical resistance” is understood to mean a glove allowing the handling of products with which the user must avoid any contact, for example products which attack the skin or contact with which is dangerous (for example corrosive chemicals).
• the total thickness of the elastomer layers in the glove according to the invention can be between 0.1 and 1 mm, preferably between 0.1 and 0.6 mm.
• the glove according to the invention advantageously possesses a puncture resistance of at least 150 N and a trouser tear strength of at least 75 N, these being measured according to the NF EN 388 standard (i.e. according to that standard, a level 4 of puncture resistance and trouser tear strength).
• the subject of the invention is also a process for manufacturing the glove as defined above.
• the process can comprise the following steps:
• the aqueous elastomer dispersions, the elastomer solutions and the high-strength fabric are as defined above with regard to the glove according to the invention.
• steps b) and c) of the process defined above it is also possible to carry out a step of crosslinking the elastomer layer obtained from step b). This is because crosslinking the elastomer advantageously makes it possible to increase its chemical resistance to solvents which will be used during step c).
• the process according to the invention alleviates the shortcomings of the prior art in that it makes it possible to produce, by the technique of dipping a fabric into an elastomer bath, a pliant glove comprising a fabric covered with elastomer layers coming from solutions of said elastomers.
• step b) of dipping the fabric into an elastomer in the form of an aqueous dispersion makes it possible to make the surface of the fabric impermeable and to prevent all of the meshes of the fabric being coated with the elastomer in solution during step c) of the process.
• the fabric therefore remains pliant and retains its mechanical properties. This makes it possible to obtain a glove which is very pliant and comfortable to wear, these being essential properties so that the user can carry out meticulous tasks while still being able to perform very accurate movements.
• the process according to the invention can advantageously include, between steps a) and b), a step a′) of immersing the mold/high-strength fabric assembly in a bath of a coagulant, followed by partially drying said assembly.
• Coagulants suitable for aqueous elastomer dispersions are well known to those skilled in the art.
• the process includes, between step c) and d), a step c′) of drying the mold/high-strength fabric/elastomer assembly obtained after step c).
• Step b) can optionally include only a single operation of dipping the mold/high-strength fabric assembly into an aqueous elastomer dispersion.
• step c) of the process according to the invention may include, depending on the desired final thickness of the elastomer, between 1 and 20, preferably between 1 and 8, operations of dipping the mold/high-strength fabric/elastomer assembly obtained after step b) into one or more elastomer solutions, said elastomers being identical or different, in one or more organic solvents or in water.
• each elastomer layer is dried, at least partially, before the next dipping operation is carried out.
• the subject of the invention is also the use of the glove defined above for handling objects with which there is a risk of cutting, puncturing or tearing.
• the subject of the invention is also the use of a high-strength glove exhibiting high chemical resistance, as defined above, for handling dangerous chemicals, such as corrosive chemicals.
• the invention also includes other provisions which will become apparent from the following description, which refers to detailed examples of how gloves according to the invention are manufactured. However, it should be clearly understood that these examples are given merely by way of illustrating the subject matter of the invention, these in no way constituting any restriction.
• a glove according to the invention comprising a high-strength fabric layer covered with a polyurethane layer obtained from an aqueous dispersion and then with a polyurethane layer obtained from a solution in an organic solvent, was obtained by the following process.
• a mold conventionally made of porcelain, having the shape and dimensions of a hand was used. This mold was firstly clothed with a high-strength fabric, for example over that part of the mold corresponding to the user's hand or over the entire surface of the mold.
• the high-strength fabric used in this case was DYNEEMA® (a high-tenacity polyethylene fabric sold by DSM).
• the mold/high-strength fabric assembly was immersed in a bath of coagulant, such as a bath of calcium nitrate. It was partially dried and then dipped into an aqueous dispersion of a polyurethane, for 30 seconds to 3 minutes for example.
• coagulant such as a bath of calcium nitrate. It was partially dried and then dipped into an aqueous dispersion of a polyurethane, for 30 seconds to 3 minutes for example.
• the mold/high-strength fabric assembly was dipped into the aqueous polyurethane dispersion so as to immerse the entire fabric in the aqueous dispersion.
• the dipping could also be carried out so as to immerse only part of the fabric in the aqueous elastomer dispersion: for example, if the fabric were present both on that part of the mold corresponding to the user's hand and on that part of the mold corresponding to his forearm, it is possible to immerse, in the aqueous elastomer dispersion, only that part of the fabric corresponding to the user's hand.
• This operation allows the surface of the high-strength fabric to be covered with a uniform polyurethane film of very small thickness (negligible thickness compared with the apparent thickness of the fabric layer, which is generally between 0.5 and 3 mm).
• a uniform polyurethane film of very small thickness (negligible thickness compared with the apparent thickness of the fabric layer, which is generally between 0.5 and 3 mm).
• the fact that the polyurethane was used in the form of an aqueous dispersion prevented the elastomer from penetrating all the way into the thickness of the fabric, since the polyurethane coagulated at the surface of the fabric.
• the meshes of the fabric were therefore made impermeable by the elastomer without being completely included in this elastomer, the fabric therefore remaining pliant.
• the mold/high-strength fabric/polyurethane assembly obtained after these steps was dried in an oven at a temperature of between 20 and 100° C. (preferably 70° C.) and for a time of between 5 and 60 minutes (preferably for 30 minutes), the temperature and the time both being chosen according to the type of polyurethane used.
• any polyurethane known to those skilled in the art capable of being dissolved in an organic solvent and of forming a film after evaporation of the solvent could be used.
• these examples are not restricted and, apart from the solubility characteristics and the film-forming properties described above, any polyurethane possessing a modulus at 20% elongation of less than 3 MPa, a modulus at 100% elongation of less than 7 MPa, a tensile strength of greater than 20 MPa and an elongation at break of greater than 400% could be used.
• the mold was kept for between 3 and 30 minutes, preferably 10 minutes, in the polyurethane solution.
• Each polyurethane layer obtained on the mold was partially dried, for example, in an oven at a temperature of between 20 and 130° C., preferably 60° C., and for a time of between 1 and 300 minutes, preferably 60 minutes, before the mold was again dipped into the polyurethane solution.
• the temperatures and times indicated here depend on the solvent for the polyurethane and on the type of polyurethane used.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Textile Engineering (AREA)
• Gloves (AREA)
• Professional, Industrial, Or Sporting Protective Garments (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=8858581

Family Applications (1)

Country Status (8)

Cited By (15)

Families Citing this family (5)

Citations (9)

Family Cites Families (2)

• 2001
  • 2001-01-08 FR FR0100171A patent/FR2819152B1/fr not_active Expired - Lifetime
• 2002
  • 2002-01-03 US US10/220,974 patent/US20040139529A1/en not_active Abandoned
  • 2002-01-03 AT AT02710079T patent/ATE406120T1/de not_active IP Right Cessation
  • 2002-01-03 WO PCT/FR2002/000010 patent/WO2002052964A1/fr not_active Ceased
  • 2002-01-03 ES ES02710079T patent/ES2312550T3/es not_active Expired - Lifetime
  • 2002-01-03 EP EP02710079A patent/EP1349463B1/de not_active Expired - Lifetime
  • 2002-01-03 DE DE60228543T patent/DE60228543D1/de not_active Expired - Lifetime
  • 2002-01-03 JP JP2002553927A patent/JP2004517223A/ja active Pending

Patent Citations (10)

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