WO2007040692A1 - Vetement protecteur recouvert de polymeres - Google Patents

Vetement protecteur recouvert de polymeres Download PDF

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Publication number
WO2007040692A1
WO2007040692A1 PCT/US2006/025454 US2006025454W WO2007040692A1 WO 2007040692 A1 WO2007040692 A1 WO 2007040692A1 US 2006025454 W US2006025454 W US 2006025454W WO 2007040692 A1 WO2007040692 A1 WO 2007040692A1
Authority
WO
WIPO (PCT)
Prior art keywords
glove
hollow member
elastomeric coating
elastic
laminate
Prior art date
Application number
PCT/US2006/025454
Other languages
English (en)
Inventor
Kaiyuan Yang
Jeffrey E. Fish
Martin S. Shamis
Jason A. Baker
Oomman P. Thomas
Original Assignee
Kimberly-Clark Worldwide, Inc.
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 Kimberly-Clark Worldwide, Inc. filed Critical Kimberly-Clark Worldwide, Inc.
Publication of WO2007040692A1 publication Critical patent/WO2007040692A1/fr

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Classifications

    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D19/00Gloves
    • A41D19/0006Gloves made of several layers of material
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D19/00Gloves
    • A41D19/0055Plastic or rubber gloves
    • A41D19/0068Two-dimensional gloves, i.e. obtained by superposition of two sheets of material
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00Materials specially adapted for outerwear
    • A41D31/04Materials specially adapted for outerwear characterised by special function or use
    • A41D31/12Hygroscopic; Water retaining
    • A41D31/125Moisture handling or wicking function through layered materials
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00Materials specially adapted for outerwear
    • A41D31/04Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14Air permeable, i.e. capable of being penetrated by gases
    • A41D31/145Air permeable, i.e. capable of being penetrated by gases using layered materials
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00Materials specially adapted for outerwear
    • A41D31/04Materials specially adapted for outerwear characterised by special function or use
    • A41D31/18Elastic
    • A41D31/185Elastic using layered materials

Definitions

  • Gloves made of woven fabrics generally allow the user's skin to breathe through the fabric such that perspiration from the hand may be wicked away by the fabric. Knit gloves are often desirable in that they allow for a relatively comfortable fit on the hand of the user. Additionally, knit gloves demonstrate at least some degree of inherent flexibility in order to accommodate movement of the user's hands. Knitting processes used to create woven knit gloves, however, are typically slow and expensive. Gloves that require greater protection against fluids, chemicals, or microscopic pathogens typically incorporate a barrier layer that is impervious to the undesirable substances. For example, surgical, examination, or work gloves typically are made using natural or synthetic rubber latex or other elastic polymer membranes.
  • gloves have been made in the past that include a combination of textile materials with elastomeric or film materials.
  • gloves have been made in the past that include an elastomeric shell that includes an internal lining composed of fibrous material, such as cotton flock.
  • the flock may be composed of finely divided, ground, fibrous particles that are applied as a lining by spraying the flock particles onto an adhesive covered shell.
  • the cotton flock lining is intended to provide a smooth, comfortable feel that cushions the hands and absorbs perspiration.
  • the cotton flock lining may also insulate against hot and cold temperatures and may facilitate donning of the glove.
  • the cotton flock lining may have various disadvantages and drawbacks.
  • the flock particles and fibers may become detached from the internal lining and can migrate out of the glove.
  • the cotton flock lining in some applications, may also be difficult to attach to the inside surface of an eiastomeric article.
  • a glue or adhesive is used that adds complexity to the process for making the glove.
  • multi-layered gloves have been produced that include a woven interior layer coated with a rubber-like material. Such gloves, however, generally have little elasticity and are typically reserved for heavy duty uses.
  • nonwoven fabric or web means a web having a structure of individual fibers or threads which are interlaid, but not in an identifiable manner as in a knitted fabric.
  • Nonwoven fabrics or webs have been formed from various processes such as, for example, meltblowing processes, spunbonding processes, and bonded carded web processes.
  • the basis weight of nonwoven fabrics is usually expressed in ounces of material per square yard (osy) or grams per square meter (gsm) and the fiber diameters are usually expressed in microns. (Note that to convert from osy to gsm, multiply osy by 33.91 ).
  • spunbonded fibers refers to small diameter fibers that are formed by extruding molten thermoplastic material as filaments from a plurality of fine, usually circular capillaries of a spinneret with the diameter of the extruded filaments then being rapidly reduced to fibers as by, for example, in U.S. Pat. No. 4,340,563 to Appel et al., and U.S. Pat. No. 3,692,618 to Dorschner et al., U.S. Pat. No. 3,802,817 to Matsuki et al.. U.S. Pat. Nos. 3,338,992 and 3,341 ,394 to Kinnev. U.S. Pat. No.
  • Spunbond fibers can be continuous and have d'iameters generally greater than about 7 microns, more particularly, between about 10 and about 20 microns.
  • meltblown fibers means fibers formed by extruding a molten thermoplastic material through a plurality of fine, usually circular, die capillaries as molten threads or filaments into converging high velocity, usually hot, gas (e.g. air) streams which attenuate the filaments of molten thermoplastic material to reduce their diameter, which may be to microfiber diameter. Thereafter, the meltblown fibers are carried by the high velocity gas stream and are deposited on a collecting surface to form a web of randomly disbursed meltblown fibers.
  • gas e.g. air
  • stretch-bonded laminate refers to a composite material having at least two layers in which one layer is a gatherable layer and the other layer is an elastic layer. The layers are joined together when the elastic layer is extended from its original condition so that upon relaxing the layers, the gatherable layer is gathered. Such a multilayer composite elastic material may be stretched to the extent that the material gathered between the bond locations allows the elastic material to elongate.
  • stretch-bonded laminate is disclosed, for example, by U.S. Pat.
  • necking or “neck stretching” interchangeably refer to a method of elongating a nonwoven fabric, generally in the machine direction, to reduce its width (cross-machine direction) in a controlled manner to a desired amount.
  • the controlled stretching may take place under cool, room temperature or greater temperatures and is limited to an increase in overall dimension in the direction being stretched up to the elongation required to break the fabric, wr ⁇ ich in most cases is about 1.2 to 1.6 times.
  • the web retracts toward, but does not return to, its original dimensions.
  • reversibly necked material refers to a material that possesses stretch and recovery characteristics formed by necking a material, then heating the necked material, and cooling the material.
  • Such a process is disclosed in U.S. Pat. No. 4,965,122 to Morman, commonly assigned to the assignee of the present invention, the entire contents of which are incorporated by reference herein in its entirety for all purposes.
  • neck bonded laminate refers to a composite material having at least two layers in which one layer is a necked, non-elastic layer and the other layer is an elastic layer. The layers are joined together when the non-elastic layer is in an extended (necked) condition.
  • neck-bonded laminates are such as those described in U.S. Pat. Nos. 5,226,992, 4,981 ,747, 4,965,122 and 5,336,545 to Morman, the entire contents of which are incorporated herein by reference in their entirety for all purposes.
  • coform means a meltblown material to which at least one other material is added during the meltblown material formation.
  • the meltblown material may be made of various polymers, including elastomeric polymers.
  • Various additional materials may be added to the meltblown fibers during formation, including, for example, pulp, superabsorbent particles, cellulose or staple fibers.
  • Coform processes are illustrated in commonly assigned U.S. Pat. No. 4,818,464 to Lau and U.S. Pat. No. 4,100.324 to Anderson et al., the entire contents of which are incorporated herein by reference in their entirety for all purposes.
  • ultrasonic bonding refers to a process in which materials (fibers, webs, films, etc.) are joined by passing the materials between a sonic horn and anvil surface, such as a roll.
  • a sonic horn and anvil surface such as a roll.
  • An example of such a process is illustrated in U.S. Pat. No. 4,374,888 to Bornslae ⁇ er. the entire contents of which are incorporated herein by reference in their entirety for all purposes.
  • the term “elastic” refers to any material, including a film, fiber, nonwoven web, or combination thereof, which upon application of a biasing force, is stretchable to a stretched, biased length which is at least about 150 percent, or one and a half times, its relaxed, unstretched length, and which will recover at least 15 percent of its elongation upon release of the stretching, biasing force.
  • elastomer or “elastomeric” refer to polymeric materials that have properties of stretchability and recovery.
  • the term “stretch” refers to the ability of a material to extend upon application of a biasing force. Percent stretch is the difference between the initial dimension of a material and that same dimension after the material has been stretched or extended following the application of a biasing force. Percent stretch may be expressed as [(stretched length + initial sample length)/initial sample length] x 100. For example, if a material having an initial length of one (1 ) inch is stretched 0.50 inch, that is, to an extended length of 1.50 inches, the material can be said to have a stretch of 50 percent.
  • the term "recover” or “recovery” refers to a contraction of a stretched material upon termination of a biasing force following stretching of the material by application of the biasing force. For example, if a material having a relaxed, unbiased length of one (1 ) inch is elongated 50 percent by stretching to a length of one and one half (1.5) inches the material would have a stretched length that is 150 percent of its relaxed length. If this exemplary stretched material contracted, that is recovered to a length of one and one tenth (1.1 ) inches after release of the biasing and stretching force, the material would have recovered 80 percent (0.4 inch) of its elongation.
  • polymer generally includes but is not limited to, homopolymers, copolymers, such as for example, block, graft, random and alternating copolymers, terpolymers, etc. and blends and modifications thereof. Furthermore, unless otherwise specifically limited, the term “polymer” shall include all possible geometrical configurations of the molecule. These configurations include, but are not limited to isotactic, syndiotactic and random symmetries.
  • the present disclosure is directed to polymer-coated garments that are not only relatively inexpensive to produce but also can have elastic properties.
  • the garment can have a shape to fit over an extremity such as a hand, an arm, a foot, or a leg.
  • the polymer- coated garment comprises a glove.
  • the glove comprises a hollow member defining an opening for receiving a hand therein.
  • the hollow member has an interior surface configured to be placed adjacent to a hand when the glove is donned and an opposite exterior surface.
  • the hollow member comprises an elastic laminate including at least one nonwoven layer.
  • a polymeric coating such as an elastomeric coating covers at least a portion of the exterior surface of the hollow member.
  • the elastomeric coating comprises a natural or synthetic polymer.
  • the elastomeric coating may form a film on the exterior surface of the hollow member.
  • the film may be continuous or may be discontinuous.
  • the elastomeric coating may form a pattern on the exterior surface of the hollow member.
  • the elastomeric coating may penetrate through the hollow member so as to not only reside on the exterior surface of the hollow member but may also be present on the interior surface of the hollow member. Alternatively, the elastomeric coating may be present on the exterior surface so as to not substantially penetrate all the way through to the interior surface of the hollow member.
  • the hollow member is generally formed from an elastic laminate.
  • the elastic laminate may comprise, for instance, a spunbond laminate, a neck-bonded laminate, and mixtures thereof.
  • the elastic laminate may have at least three layers. The three layers may include two outer nonwoven layers and a middle layer comprising elastic filaments, an elastic film, or an elastic nonwoven.
  • the outer layers may be attached to the middle layer while the middle layer is in a stretched state such that the outer layers gather when the middle layer is in a relaxed state.
  • the outer layers may comprise the same or different materials.
  • the outer layers may comprise spunDon ⁇ webs, meltblown webs, coform webs and laminates thereof.
  • the outer layer forming the exterior surface of the hollow member may comprise a meltblown web, while the outer layer of the elastic laminate forming the interior surface of the hollow member may comprise a spunbond web.
  • the hollow member may comprise a first panel attached to a second panel along a seam. The seam, for instance, may have a thickness of less than 1 mm and may have been formed by ultrasonically bonding the first panel to the second panel.
  • Each panel may comprise a similar elastic laminate or different elastic laminates.
  • one panel may comprise a neck-bonded laminate, while the second panel may comprise a spunbond laminate.
  • the neck-bonded laminate having one dimensional stretch characteristics may comprise a palm portion of the glove while a stretch-bonded laminate having two dimensional stretch characteristics may form a back portion of the glove.
  • the elastic laminate may have any suitable basis weight depending upon the glove being produced and its intended uses. The basis weight of the elastic laminate may vary, for instance, from about 20 gsm to about 400 gsm or greater.
  • the elastomeric coating may be made from any suitable film-forming polymer.
  • the polymer used to form the elastomeric coating may comprise a natural rubber latex, a nitrile polymer, a polyurethane polymer, polyvinyl chloride, a silicone polymer, an acrylic polymer, a block copolymer, and the like.
  • the block copolymer may comprise a styrenic block copolymer such as a styrene-ethylene butylene-styrene block copolymer.
  • a precoat may be present in the glove positioned between the elastomeric coating and the hollow member.
  • the precoat may be added in order to facilitate bonding between the elastomeric coating and the hollow member, may be used to polymerize the elastomeric coating material, or may be used to control penetration of the elastomeric coating into the hollow member.
  • the precoat may comprise a coagulant composition for the natural or synthetic polymer.
  • the precoat may comprise a hydrophobic composition that does not form a film on the exterior surface of the hollow member, but does serve to prevent penetration of the elastomeric material into the hollow member.
  • the elastomeric coating may cover the entire exterior surface of the hollow member or may only cover a portion of the exterior surface.
  • the hollow member may include a palm portion, finger portions, and a back side portion.
  • the elastomeric coating may be applied so as to only cover the palm portion and the finger portions.
  • the elastomeric coating may at least cover the seam in order to reinforce the attachment between the panels.
  • the finger portions of the glove may be configured to enclose the fingers of a wearer or may have open ends for allowing the fingers of a wearer to remain exposed.
  • the glove may include a cuff portion that extends only a relatively small amount past the hand of a wearer or may extend to the elbow of the wearer.
  • any suitable process may be used in order to coat the hollow member with the elastomeric material.
  • the hollow member may be dipped into an elastomeric coating composition that contains the natural or synthetic polymer.
  • the natural or synthetic polymer may be present in an aqueous dispersion or in a solvent dispersion.
  • the glove may be subjected to heat in order to cause the elastomeric material to dry, cure and/or crosslink.
  • the hollow member When contacted with the elastomeric coating composition, the hollow member may be dipped into the composition so that the elastomeric coating completely covers the hollow member or only covers the hollow member in certain areas.
  • the elastomeric coating may be applied to the hollow member so as to only cover the palm portion and the finger portions of the glove.
  • the hollow member may be placed on a former prior to being dipped into the elastomeric composition.
  • the former may comprise, for instance, a ceramic or metal mold in the shape of a hand.
  • Figures 1A and 1 B are perspective views of a glove made in accordance with one embodiment of the present disclosure
  • Figure 2 is an exploded perspective view of one embodiment of a stretch- bonded laminate that may be used in accordance with the present disclosure
  • Figure 3 is an exploded perspective view of another embodiment of a stretch-bonded laminate that may be used in accordance with the present disclosure
  • Figure 4 is an exploded perspective view of still another embodiment of a stretch-bonded laminate that may be used in accordance with the present disclosure
  • Figure 5 is a perspective view of the stretch-bonded laminate illustrated in
  • Figure 6 is a perspective view with cutaway portions of a seam formed according to one embodiment of the present disclosure.
  • Figure 7 is a perspective view of an alternative embodiment of a seam formed in accordance with the present disclosure.
  • Figure 8 is a perspective view of one embodiment of a process for producing glove liners in accordance with the present disclosure
  • Figure 9 is a perspective view of one embodiment of a process for dipping glove liners into an elastomeric coating composition
  • Figure 10A is a perspective view of one embodiment of a glove made in accordance with the present disclosure
  • Figure 10B is a perspective view of an alternative embodiment of a glove made in accordance with the present disclosure
  • Figure 11 is a cross-sectional view of one embodiment of a glove layer made in accordance with the present disclosure
  • Figure 12 is a cross-sectional view of an alternative embodiment of a glove layer made in accordance with the present disclosure
  • Figure 13 is a perspective view of another embodiment of a glove made in accordance with the present disclosure
  • Figure 14 is a perspective view of still another embodiment of a glove made in accordance with the present disclosure.
  • Figure 15 is a perspective view of yet another embodiment of a glove made in accordance with the present disclosure.
  • the ranges mentioned herein include all ranges located within the prescribed range. As such, all ranges mentioned herein include all sub-ranges included in the mentioned ranges. For instance, a range from 100- 200 also includes ranges from 110-150, 170-190, and 153-162. Further, all limits mentioned herein include all other limits included in the mentioned limits. For instance, a limit of up to 7 also includes a limit of up to 5, up to 3, and up to 4.5.
  • the present disclosure is directed to a polymer-coated protective garment.
  • the protective garment includes a hollow member that is shaped to receive an arm, a leg, a foot, or a hand of a wearer.
  • the protective garment comprises a glove for receiving a hand.
  • the glove " can be m used in numerous applications, such as for industrial applications, sports applications, medical applications, and the like.
  • gloves made according to the present disclosure include a hollow member made from an elastic laminate.
  • the elastic laminate for instance, may comprise at least one nonwoven material.
  • the hollow member is then at least partially coated with an elastomeric material.
  • the glove 10 includes a hollow member 12 formed from an elastic laminate.
  • the glove 10 further includes a polymeric coating, such as an elastomeric coating 14 that, in this embodiment, only partially covers the hollow member 12.
  • the elastomeric coating 14 covers a palm portion of the glove 10 along with the finger portions. In this manner, the back side of the hollow member remains uncoated for allowing optimum stretch and breathability.
  • Gloves and garments made in accordance with the present disclosure provide various advantages.
  • the hollow member 12 made from an elastic laminate not only provides form-fitting properties but can also be made so as to be breathable.
  • the hollow member 12 also has a lower coefficient of friction relative to the elastomeric material, thus facilitating donning or doffing of the glove.
  • the hollow member 12 can also be made from elastic laminates that can be mass produced at a relatively low cost making the gloves disposable after one or two uses.
  • the elastomeric coating 14 as shown in Figs. 1A and 1B may comprise any suitable rubber-like material.
  • the elastomeric coating 14 may comprise natural rubber latex, a nitrile polymer, polyvinyl chloride, a block copolymer, a polyurethane, a silicone polymer, an acrylic polymer, and the like.
  • the elastomeric coating 14 provides a liquid impermeable barrier that provides protection to the wearer from the environment in which the glove is used.
  • the elastdme ⁇ c material in some applications, may also have good elastic properties that can work well in combination with the hollow member 12.
  • the elastomeric coating 14 only partially covers the hollow member 12. It should be understood, however, that the elastomeric coating may be applied to other locations on the glove or to the entire glove body depending upon the particular application and the desired result.
  • the hollow member 12 is generally formed from an elastic laminate.
  • the elastic laminate may include at least one nonwoven web and at least one elastic layer.
  • the elastic laminate contains at least two layers of material but can also contain three layers, four layers, five layers, six layers or more.
  • the elastic laminate as shown in Figs. 1A and 1B forms a hollow member with an opening that fits snuggly without bunching at flex points, such as along the curves of the fingers or between individual digits of the glove 10, and without either slipping or binding too tightly against, for example, a wrist of a wearer.
  • the elastic laminate used to form the hollow member 12 comprises a stretch-bonded laminate.
  • the stretch-bonded laminate may be capable of stretching from about 50% to 400% or greater.
  • the stretch-bonded laminate may be capable of stretching 200 to 300%. The above amount of stretch not only provides comfort to the wearer but also works well in conjunction with the elastomeric coating 14.
  • the stretch-bonded laminate may be made in various different ways and may include various different layers.
  • the stretch-bonded layer may be liquid and gas permeable, only gas permeable, or impermeable to liquid and gases.
  • the stretch-bonded laminate can be made so as to be breathable.
  • the stretch-bonded laminate may include pores or openings that permit liquids and gases to pass through.
  • the stretch-bonded laminates include three layers. It should be understood, however, that fewer or more layers may be used.
  • FIG " . 2 an elastic laminate or stretch-bonded laminate 16 is illustrated.
  • the stretch-bonded laminate 16 includes an elastic layer 18 positioned in between a first outer layer 20 and a second outer layer 22.
  • the middle elastic layer comprises a plurality of elastic filaments or strands 24.
  • the elastic strands 24 may be made from any suitable elastomeric material.
  • the elastic strands may be made from LYCRA that is manufactured by E.I.
  • the elastic strands 24 may be made from various other elastomeric materials such as styrenic block copolymers.
  • the elastic strands 24 may be made from a styrene-ethylene butylene-styrene copolymer, such as KRATON G2740 available from the Kraton Polymer Company.
  • the elastomeric strands 24 may be made from elastomeric polyolefins, such as a polypropylene, a polyethylene, which includes copolymers thereof.
  • the elastic strands 24 are attached to the outer layers 20 and 22 using any suitable method or technique.
  • the elastic strands may be attached to the outer layers using an adhesive.
  • the adhesive for instance, may be sprayed on the outer layers and then attached to the elastic strands.
  • the elastic strands may be thermally, chemically, or ultrasonically bonded to the outer layers.
  • the elastic strands are attached to the outer layers 20 and 22 while the elastic strands 24 are in a stretched state. Once the strands are attached to the outer layers and relaxed, the outer layers gather together to form gatherable layers. In this manner, the stretch-bonded laminate 16 has inherent stretch properties in at least one direction.
  • the outer layers 20 and 22 may be made from any suitable material.
  • the outer layers comprise nonwoven webs.
  • the nonwoven webs may be elastic or non-elastic.
  • the first and second non-woven webs 20 and 22 may be flexible sheet materials that can provide desired skin-like barrier and elastic properties, while also improving the overall tactile aesthetics or feeling for the wearer, by reducing stiffness often found with nonwoven fabrics and the tackiness and difficult donning properties associated with latex-based substrates.
  • corrugation of the contact surface especially when gathered helps reduce the amount of surface area that actually contacts the wearer's skin, making the article 10 easier to don or doff.
  • the physical structure of nonwoven materials also can produce capillary action to wick moisture away from the wearer's skin, hence reducing any sense of wetness or clamminess and keeping the wearer feeling dry and comfortable.
  • the wrinkles may also act to enhance air flow between the glove 10 and the skin of the user.
  • the outer layers 20 and 22 can be made from polymer- based nonwoven materials that have various cloth-like properties.
  • a foundational substrate or a base nonwoven fiber web can be formed, for instance, from materials that may include synthetic fibers, pulp fibers, thermo-mechanical pulp, or mixtures of such materials.
  • Non-woven web materials suitable for use in the present disclosure may include spunbond webs, meltblown webs, spunbond- meltblown-spunbond laminates, coform webs, spunbond-film-spunbond laminates, bicomponent spunbond webs, bicomponent meltblown webs, biconstituent spunbond webs, biconstituent meltblown webs, bonded carded webs, airlaid webs, and the like.
  • the outer layers 20 and 22 may comprise spunbond webs that may be thermally bonded or through-air bonded.
  • the spunbond webs may contain bicomponent polyethylene/polypropylene filaments in a side-by-side arrangement.
  • the basis weight of the outer layers 20 and 22 can vary dramatically depending upon the particular application.
  • the basis weight of the outer layers may generally be from about 10 gsm to about 300 gsm, such as from about 15 gsm to about 200 gsm.
  • the basis weight of the outer layers may be relatively low, such as from about 12 gsm to about 20 gsm.
  • the outer layers may have a basis weight of from about 35 gsm to 175 gsm, such as from about 65 gsm to about 140 gsm.
  • the basis weight of the outer layers 20 and 22 may be similar or may be very different.
  • one or both of the outer layers 20 and 22 may comprise elastic nonwoven webs.
  • the webs may be formed from a block copolymer, such as a KRATON polymer manufactured by Kraton Polymers of Houston, Texas.
  • the elastic nonwoven webs may comprise, for instance, spunbond webs or meltblown webs.
  • stretch-bonded laminates are also disclosed in U.S. Patent No. 5,385,775, U.S. Patent No. 4,720,415, and U.S. Patent Application No. 2002/0104608, all of which are incorporated herein by reference.
  • the stretch-bonded laminate 16 may be released so that the elastic strands 24 return to their normal length, thus causing the first and second outer layers 20 and 22 to wrinkle.
  • Fig. 5 shows the stretch-bonded laminate 16 in a relaxed position in which wrinkles 26 are formed in the first and second outer layers. The wrinkles 26 may extend through the entire outer layers so that they are essentially on both sides of the layers.
  • the stretch- bonded laminate 16 thus has a certain degree of hidden stretchability that allows for the stretch-bonded laminate 16 to function as a glove 10 or other protective article so that movement of a portion of the user's body causes a stretching in the stretch-bonded laminate 16 while still maintaining a comfortable fit onto the user.
  • the stretch-bonded laminate 16 may fit tightly onto the skin of the user in both a relaxed state and then in a stretched state where the user moves a portion of his or her body.
  • the elastic strands 24 are arranged so as to be parallel.
  • Like reference numerals have been used to indicate similar elements.
  • the elastic filaments or strands 24 are formed into a grid-like or mesh-type shape.
  • the elasticity may be one dimensional, but second dimensional elasticity can come from elastic fibers if present in the first and second nonwoven webs 20 and 22. If elastic fiber webs can be formed by spraying fibers perpendicular to the parallel strands, a knit-like microstructure is formed and may be vapor or liquid permeable.
  • the grid type of arrangement of Fig. 3 may allow for the stretch-bonded laminate 16 to stretch in various directions and may also incorporate additional stretching from the outer layers 20 and 22.
  • the elastic strands 24 may be viewed as mesh frames that are equivalent to mesh structures formed in woven products during the knitting process but with improved surface flexibility and structural variations. However, in accordance with other exemplary emoodiitierits the elastic strands 24 may be arranged in any desired direction so as to accommodate stretching in various directions.
  • the spunbonded laminate 16 includes an elastic layer 18 positioned in between a first outer layer 20 and a second outer layer 22.
  • the elastic layer 18 comprises an elastic film.
  • the film may be made from any suitable elastomeric material, such as a styrenic block copolymer, an elastomeric polyethylene, an elastomeric polypropylene, or any other suitable elastomeric material.
  • the film 18 can be made from any of the same materials described above with respect to the elastic filaments 24.
  • the elastic film layer 18 may be stretched and then attached to the outer layers 20 and 22 for forming the laminate material.
  • the use of an elastic film layer 18 may be desirable in some applications.
  • the film layer 18 may provide further protection to the hand of the wearer by serving as a barrier layer to the hand.
  • the use of a film layer may be incorporated into the glove 10 where the elastomeric coating 14 is not present.
  • the film layer 18 may prevent penetration of the elastomeric coating which may provide the glove with a higher degree of flexibility and comfort.
  • the glove of the present disclosure may be constructed from various other types of elastic laminates.
  • a neck-bonded laminate including reverse neck-bonded laminates may be used.
  • the elastic laminate When incorporated into a glove, the elastic laminate may have uniform stretch properties or may have non-uniform stretch properties in one or more directions.
  • the elastic laminate may be formed so that greater stretch and/or elasticity may be built into the laminate in particular areas, such as where the glove is expected to undergo greater tension.
  • greater amounts of stretch or elasticity may be incorporated into the hollow member in the palm area, in the cuff area, in the back side of the glove, or on the finger portions where the knuckles are located.
  • the greater stretch or elastic areas may comprise bands that extend across the elastic laminate.
  • the elastic laminate may comprise a stretch-bonded laminate containing outer layers made from a nonwoven web, such as a spunbond web.
  • the spunbond webs may be formed on a forming surface containing cavities where greater amounts of fibers may deposit. These cavities, for instance, can have a rectangular shape that extends in the machine direction or the cross-machine direction.
  • the higher basis weight areas formed in the cavities on the forming surface may provide greater inherent stretch in those areas.
  • the stretch or elasticity in those areas may be from about 5% to about 20% greater than the remainder of the laminate, such as from about 5% to about 10% greater.
  • the basis weight of the elastic laminate used to construct the hollow member 12 as shown in Figs. 1 A and 1B may vary depending upon the particular application and the desired results. For instance, lower basis weights may be used where tactile properties are more desirable. Higher basis weights, however, may be used where greater protection is needed.
  • the basis weight of the elastic laminate may vary from about 25 gsm or lower to 400 gsm and greater.
  • the basis weight of the elastic laminate may vary from about 30 gsm to about 200 gsm, such as from about 50 gsm to about 100 gsm.
  • a single piece of elastic laminate may be used to form the glove or multiple panels may be used.
  • a first panel may be attached to a second panel in forming the hollow member.
  • the panels may be made from different materials.
  • different types of elastic laminates or elastic laminates having different properties can be used to form the palm portion of the glove and the back side of the glove.
  • an elastic laminate having stretch in generally one direction may be used for the palm side of the glove while an elastic laminate having stretch in multiple directions may be used for the back side, where greater stretch is typically needed.
  • a neck-bonded laminate may be used to form the palm side of the glove containing a film layer while a stretch-bonded laminate containing elastic filaments may be used to construct the back side of the glove.
  • the spunbonded laminate has better elasticity which may be desirable on the back side of the glove since more flexibility is needed when the hand bends to form a fist.
  • the stretch-bonded laminate may allow gas flow therethrough so that the glove can be breathable, especially in applications where the back side of the glove is not coated with the elastomeric coating.
  • the neck-bonded laminate may contain a polymer film layer so as to provide further barrier protection to the palm side of the hand where substances are more prone to contact the glove.
  • the film layer also will maintain the elastomeric coating on the outside layer of the laminate.
  • the elastic laminate used to form the palm side of the glove may be thicker and have a greater basis weight than the elastic laminate used to form the back side of the glove.
  • both elastic laminates may have a similar or different construction.
  • the palm side may be thicker and have a greater basis weight for providing greater protection against objects that are held with the glove.
  • the two panels may be attached together using any suitable method or technique.
  • the panels may be adhesively bonded together, thermally bonded together, or ultrasonically bonded together.
  • the panels may be sewn together to form the seam.
  • Fig. 6 shows a cut away portion of the inside of a glove 10 in accordance with one exemplary embodiment.
  • a first stretch-bonded laminate 28 is attached to a second stretch-bonded laminate 30 thus forming a seam 32.
  • the seam 32 may have a height 34 that is up to 5 mm in length in accordance with certain exemplary embodiments.
  • the height 34 of the seam 32 may be up to three millimeters, up to two millimeters, or less than one millimeter in accordance with certain exemplary embodiments.
  • the height 34 of the seam 32 may impact the comfort of the user during wearing of the glove 10. For example, if the height 34 of the seam 32 is relatively large, the user will feel the seam 32 if the hollow member is inverted and may experience discomfort therefrom. Additionally, the height 34 of the seam 32 may also hinder removal of the glove 10 from the user or may interfere with donning of the glove 10. If the hollow member is not inverted and the seam remains on the exterior surface of the hollow member, a relatively large seam may interfere with use of the glove.
  • the first and second stretch-bonded laminates 28 and 30 may be connected to one another through one or more "flush" seam bonds 36 as shown in Fig. 7.
  • flush seam bonds can be formed through a single step ultrasonic bonding and cutting process.
  • the seams are formed between the first and second stretch-bonded laminates so as to have a height of generally equal to or less than 1 mm.
  • the flush seam bond 36 allows for a greater degree of user comfort of the glove 10 as the user will not be able to feel discomfort from any seams during wearing of the glove 10.
  • flush seam bonding may allow for the glove 10 to be more easily donned and removed from the hand of the user as seams 32 will not be present to interfere with donning and removal.
  • the flush seam bonds 36 may be desirable in that they result in a glove 10 that can have the same quality as woven knit gloves with respect to wearing feel and comfort. Additionally, the stretchability of the glove 10 may also provide for desired hand fitting properties and allow for easy donning and removal of the glove 10.
  • the flush seam bonds 36 may be less than about 500 micrometers ( ⁇ m) in width and about 500 ⁇ m in height.
  • the flush seam bond 36 may also be less than 400 or 300 ⁇ m in width and 400 or 300 ⁇ m in height.
  • the flush seam bond 36 is less than 100 ⁇ m in width and 100 ⁇ m in height.
  • the flush seam bond 36 width can be as narrow as about 50 ⁇ m.
  • the width and height of the flush seam bond may be controlled, for instance, by varying the width, height and the cutting angle of the glove pattern on the bonding horn or bonding anvil, or ultrasonic sewing die.
  • a seam 36 line may be formed by employing an ultrasonic glove cut/seal fixture in which a flat top is present for cutting within an angle slope for simultaneous sealing.
  • the slope part of the fixture may only melt the laminates so that the strands will be intimately bonded together for preventing the formation of loose strands.
  • the loose strands may be less than 50% after cut/seal, and in some embodiments, less than 75%, and in some embodiments, less than 85%, and in some embodiments, less than 90%.
  • the seam may have a relatively uniform width or may have a non-uniform width.
  • the seam may be wider or may include additional bonding points in high stress areas.
  • the high stress areas may include between the thumb and the palm, between the fingers, and surrounding the opening of the glove.
  • gloves 10 may be in a variety of sizes and shapes, ultrasonic bonding installations, such as a plunge bonder, may not be able to place a whole hand glove facial onto a horn.
  • a glove 10 at 7 x 10 inches in size cannot be fabricated by a bonder that can only support a 6 x 9 inch horn. This is particularly true for large size gloves when the size is beyond the limit of a given ultrasonic bonder.
  • two horns may be needed to make a hollow member 12.
  • four horns may be needed.
  • Each horn can have a facial for bonding one area of the hollow member.
  • the glove facial can be placed onto a large anvil and use a smaller horn to bond the glove in one or more successive plunge bonds.
  • Rotary ultrasonic bonding can also be used with a pattern located on a cylindrical anvil.
  • three-dimensional shaped gloves or other garments can be made by stretching one laminate during bonding.
  • the stretched laminate retracts to its normal length and causes the glove 10 to have a three-dimensional shape.
  • Such a bonding process is especially useful for forming a glove that has open finger tips, as shown in Fig. 13.
  • the hollow member can also be formed so as to include a hemline surrounding the opening for receiving the hand.
  • the hem can be formed by either forming a cut/seal edge by ultrasonic sewing or employing a traditional hem-forming machine. The hem can be used to reinforce the strength of the cuff of the glove.
  • Fig. 8 shows a process of manufacturing the hollow member 12 as shown in Figs. 1 A and 1B in accordance with one exemplary embodiment.
  • first and second stretch-bonded laminates 28 and 30 are drawn towards one another and formed into the hollow member through an ultrasonic bonding step 48.
  • the ultrasonic bonding step 48 and related manufacturing steps may be performed as that shown and described in United States Application No. 11/118,078 filed April 29, 2005, the entire contents of which are incorporated by reference herein in their entirety for all purposes.
  • the 8 may employ a blade horn 52 positioned on one side of the first stretch-bonded laminate 28 while an anvil 54, in this case a cylindrical anvil having a pattern of gloves thereon, is located adjacent the second stretch-bonded laminate 30.
  • the blade horn 52 may be moved into engagement with the laminates to simultaneously bond and cut the laminates in order to form the flush seam bond 36 thereon.
  • the rotary anvil 54 may be configured to have an edge that is flat for cutting and an angled side for the sealing function as shown and described in the above-mentioned United States Application No. 11/118,078.
  • the hollow members may be arranged so that the opening for the hand of the user is located on an edge of the laminates. Once formed, the hollow members may be removed and collected.
  • the process shown in Fig. 8 may be a continuous rotary process so that the hollow members may be manufactured at a high rate of speed. Alternatively, an intermittent process for the formation of the hollow members may also be employed, if desired, in accordance with other exemplary embodiments.
  • An inverting step may be employed to turn the hollow member so that the flush seam bonds 36 that have any height thereto are then located on the inside of the hollow member.
  • the inverting step is not necessary in accordance with other exemplary embodiments.
  • the hollow member may be constructed and arranged so that the height of the flush seam bonds 36 are located on the outside of the hollow member.
  • the flush seam bonds 36 may be formed so that a height is negligible.
  • the hollow member 12 is then contacted with an elastomeric composition for forming a coating at least on a portion of the hollow member.
  • an elastomeric coating may cover the palm portion and the finger portions of the glove 10.
  • the elastomeric coating composition may contain any suitable natural or synthetic film- forming polymer.
  • the elastic coating composition may comprise an aqueous- based dispersion or a solvent-based dispersion.
  • Polymers that may be present in the elastomeric coating composition include natural rubber latex, nitrile polymers, polyvinyl chloride polymers, polyurethane polymers, silicone polymers, acrylic polymers, block copolymers such as styrenic block copolymers, and the like.
  • a nitrile polymer refers to any film-forming polymer that contains acrylonitrile.
  • Particular styrenic block copolymers that may be used include styrene- ethylene butylene-styrene block copolymers, styrene-isoprene-styrene block copolymers, styrene-butadiene-styrene block copolymers, styrene-isoprene block copolymers, styrene-butadiene block copolymers, and the like.
  • Block copolymers, for example, that may be used in the present disclosure are disclosed, for instance, in U.S. Patent No. 5,112,900, U.S. Patent No. 5,407,715, U.S. Patent No.
  • the hollow member 12 may be dipped into the composition. Once contacted with the elastomeric composition, the resulting glove may be heated in order to dry and/or cure the elastomeric coating.
  • the manner in which the elastomeric coating composition is contacted with the hollow member 12 can vary depending upon the particular application and the desired result.
  • the hollow member may contact the coating composition in a flat configuration.
  • the hollow member may be placed on a hand-shaped former and then dipped into the elastomeric coating composition. It has been discovered that the above two processes may produce gloves having different physical characteristics.
  • Fig. 10B is an exemplary drawing of a glove 10 in which the hollow member 12 has been dipped into an elastomeric coating composition to form an elastomeric coating 14 while the hollow member is in a flat state.
  • the coated glove 10 also assumes a relatively flat configuration. This may be desirable in order to more easily pack the gloves and ship them.
  • a three-dimensional glove 10 as shown in Fig. 10A may result.
  • the present inventors have found that when the hollow member is placed on a hand-shaped former and dip coated, the glove 10 assumes a three- dimensional shape after curing.
  • the process includes a plurality of hand-shaped formers 40.
  • the formers 40 may be made from ceramic and are grouped in rows and moved along a conveyor line 42.
  • the hollow members 12 are placed upon each of the formers 40.
  • the hand-shaped formers 40 move along the conveyor line 42, the hollow members 12 are dipped into a dipping composition 44 in order to form an elastomeric coating on at least a portion of the hollow member.
  • a dip tank 46 is shown in the figure.
  • the process may include a plurality of dip tanks containing different or the same compositions.
  • the process line can also include various heating devices for heating the elastomeric composition being formed on the hollow members.
  • the process illustrated in Fig. 9 is intended to represent a continuous process. In an alternative embodiment, however, the hand-shaped formers 40 may be assembled into groups and processed separately in a batch processing operation.
  • the entire hand shape of the hollow member 12 is being coated with the elastomeric composition.
  • the molds can be dipped only partially into the coating composition as desired.
  • the formers 40 can be placed into the elastomeric coating composition at an angle as needed in order to coat the hollow member where desired.
  • the coating can extend so as to surround any seam contained within the hollow member. Coating the seam further reinforces the strength of the seam and prevents against rupture during use. In addition to a dipping process as shown in Fig.
  • the elastomeric coating composition may also be applied to the hollow member in other ways.
  • the elastomeric coating composition can be sprayed or extruded onto the hollow member.
  • a glove 10 made in accordance with the present disclosure is illustrated.
  • the elastomeric coating 14 is applied to the hollow member 12 in a discontinuous fashion.
  • the elastomeric coating 14 comprises a pattern of discrete shapes or dots. In this manner, it should be appreciated that any suitable pattern may be applied to the hollow member.
  • the amount the elastomeric coating composition penetrates through the thickness of the elastic member can also vary depending upon the particular application and the desired results. In one embodiment, for instance, it may be desirable to have the elastomeric coating composition penetrate through to the inside surface of the hollow member. In this embodiment, for instance, the elastic laminates may be completely impregnated by the elastomeric coating composition. In this manner, the elastic laminates that form the hollow member create a reinforcing matrix for the elastomeric coating.
  • the elastomeric coating composition may be desirable only for the elastomeric coating composition to penetrate only a portion of the thickness of the hollow member. For example, sufficient penetration of the hollow member may be needed in order for there to be suitable bonding between the elastomeric coating and the outside surface of the hollow member. Too much penetration, however, can increase the stiffness of the resulting article. Further, preventing penetration to the inside surface of the hollow member leaves, in one embodiment, a nonwoven material placed adjacent to the hand which provides softness and comfort to the wearer. Further, as described above, when the nonwoven web forms the interior surface of the glove, the glove can be easily donned by the wearer.
  • the hollow member may be formed from an elastic laminate containing a film as shown in Fig. 4.
  • an elastic laminate 16 is shown including two outer nonwoven layers 20 and 22 and a middle elastic layer 18 formed from a film.
  • the elastic laminate 16 further includes an elastomeric coating 14. Presence of the film layer 18 prevents penetration of the elastomeric coating composition into the outer layer 22.
  • various other processing techniques may also be used to control penetration. For example, penetration of the coating composition can be controlled by varying the viscosity of the coating composition. For instance, by increasing the viscosity, penetration of the elastomeric coating composition into the hollow member can be reduced.
  • the elastic laminate may include an exterior surface comprising a meltblown web containing relatively small fibers.
  • the meltblown web may be used to prevent the coating composition from impregnating the entire layer.
  • the diameter of the fibers may range from about 10 microns to less than 1 micron.
  • penetration of the elastomeric coating can be controlled by controlling fiber packing density of the elastic laminate. For example, increasing the fiber packing density will generally inhibit the elastomeric coating composition from penetrating through the layer.
  • the packing density may vary from about 0.05 g/cc to about 0.3 g/cc.
  • penetration of the elastomeric coating can be controlled by controlling the surface energy of the outside surface of the hollow member.
  • hydrophobic surfaces may react differently to the elastomeric coating than hydrophilic surfaces.
  • a hydrophobic surface will prevent penetration of the coating composition.
  • the exterior surface of the laminate may be modified or otherwise constructed to control penetration, while the interior surface may have different characteristics.
  • the elastic laminate may include two outer layers in which the outer layer forming the exterior surface of the hollow member has a small pore size while the outer layer forming the interior surface of the hollow member has a relatively large pore size. The same can hold true for packing density, fiber diameters, and surface energy.
  • a precoat on the hollow member may be used in order to control penetration of the elastomeric coating composition.
  • the precoat for instance, may comprise a chemical composition applied to the exterior surface of the hollow member.
  • the chemical composition may not form a film on the hollow member but may serve to control penetration of the elastomeric coating.
  • the precoat may comprise a coagulant composition for coagulating the natural or synthetic polymer contained within the elastomeric coating composition.
  • the precoat composition may contain a coagulant which causes a film-forming polymer such as natural rubber latex or nitrile polymer to coagulate and polymerize on the outside surface of the hollow member.
  • Coagulants that may be used may include, for instance, a solution of a coagulant salt such as a metal salt.
  • coagulants include but are not limited to water soluble salts of calcium, zinc, aluminum, and the like.
  • calcium nitrate in water or alcohol may be used as the coagulant composition.
  • the amount of coagulant present in the solution may determine the amount of penetration of the elastomeric composition.
  • the coagulant composition can be sprayed on the hollow member or the hollow member may be dipped into the coagulant composition.
  • the hollow member may be applied to a hand-shaped former and dipped into the coagulant composition prior to being dipped into the elastomeric coating composition.
  • the coagulant may air dry leaving a residual coating on the hollow member.
  • the coagulant causes the polymer contained in the elastomeric composition to become locally unstable and coagulate on the surface of the hollow member.
  • the coagulant itself does not form a separate layer on the article, but rather becomes part of the resulting film.
  • the precoat may comprise other chemical compositions.
  • the hollow member may be treated with a hydrophobic composition that controls and reduces penetration of the elastomeric coating.
  • the thickness of the resulting coating may vary.
  • the thickness of the film for instance, may be increased or decreased by increasing or decreasing the dwell time during which the hollow member contacts the coating composition.
  • Total thickness of the elastomeric coating may also depend on various other parameters as well.
  • multiple layers of the elastomeric coating composition may be applied to the hollow member.
  • an elastic laminate 16 is shown including an elastomeric coating 14.
  • the elastic laminate includes two outer layers 20 and 22 and an elastic film middle layer 18.
  • the elastomeric coating 14 includes two layers, an interior layer 60 and an outer layer 62. It should be understood that multiple layers applied to the hollow member may be indistinguishable. Fig. 12, however, is provided for purposes of illustration only.
  • the layers can be made from the same material or from different materials.
  • the layers may also have different thicknesses depending upon the particular application.
  • the second layer applied to the hollow member may be applied in the same areas as the first layer or may be applied in different areas. For example, in one embodiment, the second layer may only be applied to portions of the glove where further reinforcement is needed.
  • the natural or synthetic polymer contained within the elastomeric coating may be dried, cured or vulcanized if necessary.
  • the polymer may be cured by high temperature reaction with a vulcanizing agent, such as sulfur, to cause cross-linking of the polymer chains. Curing may generally take place at temperatures of about 50 0 C to about 200 0 C although the temperature is dependent upon the particular polymer used.
  • the high temperature process may cause the evaporation of any volatile components remaining in the glove, including any water remaining in the layers.
  • the elastomeric coating may be air dried or cured at room temperature.
  • the thickness of the elastomeric coating can vary from 3 mils or less to greater than 15 mils or less.
  • the thickness of the elastomeric coating may be from about 3 mils to about 5.5 mils.
  • the gloves may be immersed into a leaching bath and leached.
  • the articles may be subjected to a halogenation process, such as, for example, a chlorination process to improve the surface characteristics of the elastomeric coating. Halogenation, for instance, can control the tackiness of the resulting layer.
  • various other treatments may also be applied to the glove.
  • a skincare formulation or antimicrobial/antiviral agents may be applied to the glove if desired.
  • the inside surface of the hollow member can be treated with a composition intended to protect the skin of the wearer or to otherwise provide benefits to the skin.
  • the skincare formulation for instance, may comprise a moisturizer and various other therapeutic components.
  • the gloves can be made in any size or any suitable color.
  • the glove of the present disclosure may be used in all different types of applications. Particular embodiments of gloves in addition to the one illustrated in Figs. 1A and 1B are shown in Figs. 13 and 14.
  • a glove 10 is illustrated that may be used for sports or recreational purposes.
  • the glove 10 includes finger portions having open ends for allowing the uppermost portion of the fingers to remain uncovered.
  • the glove 10 includes a hollow member 12 and an elastomeric coating 14.
  • the elastomeric coating only covers the palm portion of the glove 10.
  • Such gloves suited for use in weightlifting, bicycling, climbing, and sailing in addition to various other applications.
  • a glove 10 made in accordance with the present disclosure is illustrated.
  • the hollow member of the glove 10 is completely coated by the elastomeric coating.
  • the glove 10 includes an extended cuff portion 70.
  • the cuff portion 70 may extend from the hand to an elbow of the wearer.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Gloves (AREA)

Abstract

L'invention concerne un vêtement protecteur recouvert de polymères. Le vêtement peut être configuré pour s'adapter autour du bras, de la jambe, du pied ou de la main d'un porteur. Par exemple, dans un mode de réalisation, le vêtement protecteur comprend un gant. Le gant comprend un élément creux définissant une ouverture destinée à recevoir une main. L'élément creux est fabriqué à partir d'un stratifié élastique. Le stratifié élastique peut comprendre au moins une toile non tissée. L'élément creux comprend en outre un revêtement élastomérique qui recouvre au moins une partie de l'élément creux. Dans un mode de réalisation, par exemple, le revêtement élastomérique recouvre une partie de paume et des parties de doigts du gant.
PCT/US2006/025454 2005-09-16 2006-06-29 Vetement protecteur recouvert de polymeres WO2007040692A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/229,021 2005-09-16
US11/229,021 US20070083980A1 (en) 2005-09-16 2005-09-16 Polymer-coated protective garment

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WO2007040692A1 true WO2007040692A1 (fr) 2007-04-12

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CN104159461B (zh) * 2012-03-20 2015-11-25 W.L.戈尔有限公司 可呼吸的浸渍手套
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