US20040158212A1 - Disposable absorbent article comprising a durable hydrophilic core wrap - Google Patents

Disposable absorbent article comprising a durable hydrophilic core wrap Download PDF

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Publication number
US20040158212A1
US20040158212A1 US10/758,066 US75806604A US2004158212A1 US 20040158212 A1 US20040158212 A1 US 20040158212A1 US 75806604 A US75806604 A US 75806604A US 2004158212 A1 US2004158212 A1 US 2004158212A1
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United States
Prior art keywords
absorbent article
disposable absorbent
article according
substrate
nanoparticles
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Abandoned
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US10/758,066
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English (en)
Inventor
Ekaterina Ponomarenko
John Carter
Ronald Cramer
Mattias Schmidt
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Procter and Gamble Co
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Procter and Gamble Co
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Priority to US10/758,066 priority Critical patent/US20040158212A1/en
Assigned to PROCTER & GAMBLE COMPANY, THE reassignment PROCTER & GAMBLE COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CARTER, JOHN DAVID, CRAMER, RONALD DEAN, PONOMARENKO, EKATERINA ANATOLYEVNA, SCHMIDT, MATTIAS
Publication of US20040158212A1 publication Critical patent/US20040158212A1/en
Assigned to PROCTOR & GAMBLE COMPANY, THE reassignment PROCTOR & GAMBLE COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CARTER, JOHN DAVID, CRAMER, RONALD DEAN, PONOMARENKO, EKATERINA A., ROHRBAUGH, ROBERT HENRY, SCHMIDT, MATTIAS
Priority to US11/480,194 priority patent/US7923597B2/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • A61F13/1565—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres by depositing continuous layers of fibrous material between webs, e.g. wrapping layers of fibrous material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/494—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means
    • A61F13/49406—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means being at the crotch region
    • A61F13/49446—Absorbent articles specially adapted to be worn around the waist, e.g. diapers characterised by edge leakage prevention means the edge leakage prevention means being at the crotch region the edge leakage prevention means being an impermeable sheet or impermeable part of a sheet placed on or under the top sheet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53708—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/53743—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers
    • A61F13/53747—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the position of the layer relative to the other layers the layer is facing the topsheet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F2013/5315—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad with a tissue-wrapped core
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F2013/53463—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad with a reinforcing structure, e.g. net
    • A61F2013/53472—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad with a reinforcing structure, e.g. net being a non-woven tissue wrapping the core

Definitions

  • the present invention relates to disposable absorbent article comprising a durable hydrophilic core wrap, and methods of producing same.
  • Disposable absorbent articles such as diapers and adult incontinence products are well known in the art. Such disposable articles collect and retain urine and fecal material deposited thereon by the wearer.
  • Nonwoven fabrics made of synthetic fibers and/or natural fibers are commonly used in absorbent articles, for example, as topsheet material or as core wrap to enclose the storage layer of the absorbent core.
  • Such nonwoven fabrics are usually hydrophobic.
  • hydrophilic nonwoven it is necessary to have hydrophilic nonwoven. Therefore the nonwoven fabric has to be treated accordingly.
  • a core wrap is typically a nonwoven material designed to contain the storage layer and provide structural integrity when the storage layer is wet or dry. They may be a tissue wrap, or more typically they are a nonwoven material which has been rendered hydrophilic.
  • a common method for rendering nonwoven fabrics hydrophilic is coating the surface of the nonwoven with hydrophilic surfactants. As this coating does not lead to a tight chemical bond between the nonwoven and the surfactant, the surfactant can be washed off during use when the absorbent article is wetted.
  • the decrease in liquid strike-through time is a desirable effect when the nonwoven is coated with surfactant.
  • Liquid strike-through refers to liquid passing through the nonwoven fabric with liquid strike-through time referring to the time it takes for a certain amount of liquid to pass through the nonwoven.
  • the strike-through time in the next gushes is increased.
  • Plasma is an ionized form of gas that can be obtained by ionizing a gas or liquid medium.
  • Plasmas are widely used for the treatment of organic and inorganic materials to promote adhesion between various materials. Polymers that have chemically inert surfaces with low surface energies do not allow good coatings with bondings and adhesives. Thus, these surfaces are treated to make them receptive to bonding with other substrates, coatings, adhesives and printing inks.
  • a first aspect of the present invention provides a disposable absorbent article comprising an absorbent core, the absorbent core comprising:
  • a durable hydrophilic fluid pervious core wrap comprising:
  • a hydrophilicity boosting composition coated on the substrate comprising a hydrophilicity boosting amount of nanoparticles, wherein the nanoparticles have a particle size of from about 1 to about 750 nanometers.
  • a second aspect of the present invention provides a process for making a disposable absorbent article comprising an absorbent core, the absorbent core comprising a storage layer and a durable hydrophilic core wrap, the core wrap surrounding at least a portion of the storage layer and said process comprising the step of:
  • the hydrophilicity boosting composition comprises a hydrophilicity boosting amount of nanoparticles, wherein the nanoparticles having a particle size of from about 1 to about 750 nanometers.
  • FIG. 1 is a partial cut-away top plan view of a disposable absorbent article including an absorbent core and a durable hydrophilic core wrap.
  • FIG. 2 is a partial sectional view along 2 - 2 of one alternative embodiment of the absorbent core 10 of the disposable absorbent article of FIG. 1.
  • FIG. 3 is a sectional view along 2 - 2 of another alternative embodiment of the absorbent core 10 of the disposable absorbent article of FIG. 1.
  • FIG. 4 is a sectional view along 2 - 2 of another alternative embodiment of the absorbent core 10 of the disposable absorbent article of FIG. 1.
  • FIG. 5 is a sectional view along 2 - 2 of another alternative embodiment of the absorbent core 10 of the disposable absorbent article of FIG. 1.
  • FIG. 6 is a sectional view along 2 - 2 of another alternative embodiment of the absorbent core 10 of the disposable absorbent article of FIG. 1.
  • FIG. 7 is a schematic side view of a process for forming an absorbent article according to the present invention.
  • FIG. 8 is a schematic top view of a strike-through plate which may be used to measure Liquid Strike-through of a substrate.
  • FIG. 9 is a sectional view along 9 - 9 of the strike-through plate of FIG. 8.
  • FIG. 10 is a sectional perspective view along 10 - 10 of the strike-through plate of FIG. 8.
  • coating includes coatings that completely cover a surface, or portion thereof (e.g., continuous coatings, including those that form films on the surface), as well as coatings that may only partially cover a surface, such as those coatings that after drying leave gaps in coverage on a surface (e.g., discontinuous coatings).
  • the later category of coatings may include, but is not limited to, a network of covered and uncovered portions and distributions of nanoparticles on a surface which may have spaces between the nanoparticles.
  • the coating preferably forms at least one layer of nanoparticles on the surface which has been coated, and is substantially uniform.
  • the coatings described herein are described as being applied to a surface, it is understood that the coatings need not be applied to, or that they cover the entire surface. For instance, the coatings will be considered as being applied to a surface even if they are only applied to modify a portion of the surface.
  • hydrophilic describes fibers or surfaces of fibers, which are wettable by aqueous fluids (e.g., aqueous body fluids) deposited on these fibers. Hydrophilicity and wettability are typically defined in terms of contact angle and the strike-through time of the fluids, for example through a nonwoven fabric. This is discussed in detail in the American Chemical Society publication entitled “Contact Angle, Wettability and Adhesion”, edited by Robert F. Gould (Copyright 1964).
  • a fiber or surface of a fiber is said to be wetted by a fluid (i.e., hydrophilic) when either the contact angle between the fluid and the fiber, or its surface, is less than 90°, or when the fluid tends to spread spontaneously across the surface of the fiber, both conditions are normally co-existing.
  • a fiber or surface of the fiber is considered to be hydrophobic if the contact angle is greater than 90° and the fluid does not spread spontaneously across the surface of the fiber.
  • hydrophilicity boosting means a composition when coated on a core wrap substrate to make a durable hydrophilic fluid pervious core wrap, produces a durable hydrophilic fluid pervious core wrap which has a liquid strike-through time for the first gush of less than or equal to about 6 seconds, more preferably less than or equal to about 4 seconds, and has a liquid strike-through time for the fifth gush of test liquid, of preferably less than or equal to about 6 seconds, more preferably less than or equal to about 4 seconds, when tested in accordance with the Strike-Through Test in the Test Methods section and further described herein.
  • the term “comprising” means that the various components, ingredients, or steps can be conjointly employed in practicing the present invention. Accordingly, the term “comprising” is open-ended and encompasses the more restrictive terms “consisting essentially of” and “consisting of”.
  • the disposable absorbent articles of the present invention comprise an absorbent core at least a portion of which is surrounded by a durable hydrophilic fluid pervious core wrap.
  • a durable hydrophilic fluid pervious core wrap examples include but are not limited to, diapers, adult incontinence products, training pant, feminine hygiene pads, panty liners and the like.
  • the durable hydrophilic fluid pervious core wrap comprises a core wrap substrate which has been coated with a hydrophilicity boosting composition.
  • the substrate, and hydrophilicity boosting composition are both exemplified in more detail herein.
  • FIG. 1 is a plan view of a disposable absorbent article, specifically a diaper 20 , which is a preferred embodiment of an absorbent article according to the present invention.
  • the diaper is shown in its flat out, uncontracted state (i.e., without elastic induced contraction). Portions of the structure are cut away to show the underlying structure of the diaper 20 , especially the absorbent core 10 .
  • the portion of the diaper 20 that contacts a wearer is facing the viewer.
  • the chassis 22 of the diaper 20 in FIG. 1 comprises the main body of the diaper 20 .
  • the chassis 22 comprises an outer covering including a liquid pervious topsheet 24 and/or a liquid impervious backsheet 26 .
  • the chassis may also include most or all of the absorbent core 10 encased between the topsheet 24 and the backsheet 26 .
  • the chassis 22 comprises the main structure of the diaper with other features added to form the composite diaper structure. While the topsheet 24 , the backsheet 26 , and the absorbent core 10 may be assembled in a variety of well-known configurations, preferred diaper configurations are described generally in U.S. Pat. No. 5,569,234 entitled “Disposable Pull-On Pant” issued to Buell et al. on Oct. 29, 1996; and U.S. Pat. No. 6,004,306 entitled “Absorbent Article With Multi-Directional Extensible Side Panels” issued to Robles et al. on Dec. 21, 1999.
  • the topsheet 24 in FIG. 1 may be fully or partially elasticized or may be foreshortened to provide a void space between the topsheet 24 and the absorbent core 10 .
  • Exemplary structures including elasticized or foreshortened topsheets are described in more detail in U.S. Pat. No. 5,037,416 entitled “Disposable Absorbent Article Having Elastically Extensible Topsheet” issued to Allen et al. on Aug. 6, 1991; and U.S. Pat. No. 5,269,775 entitled “Trisection Topsheets for Disposable Absorbent Articles and Disposable Absorbent Articles Having Such Trisection Topsheets” issued to Freeland et al. on Dec. 14, 1993.
  • the backsheet 26 in FIG. 1 is generally the portion of the diaper 20 positioned with the absorbent core 10 between the backsheet 26 and the topsheet 24 .
  • the backsheet 26 may be joined with the topsheet 24 .
  • the backsheet 26 prevents the exudates absorbed by the absorbent core 10 and contained within the article 20 from soiling other external articles that may contact the diaper 20 , such as bed sheets and undergarments.
  • the backsheet 26 is substantially impervious to liquids (e.g., urine) and comprises a laminate of a nonwoven and a thin plastic film such as a thermoplastic film having a thickness of about 0.012 mm (0.5 mil) to about 0.051 mm (2.0 mils).
  • Suitable backsheet films include those manufactured by Tredegar Industries Inc.
  • Suitable backsheet materials may include breathable materials that permit vapors to escape from the diaper 20 while still preventing exudates from passing through the backsheet 26 .
  • Exemplary breathable materials may include materials such as woven webs, nonwoven webs, composite materials such as film-coated nonwoven webs, and microporous films such as manufactured by Mitsui Toatsu Co., of Japan under the designation ESPOIR NO and by EXXON Chemical Co., of Bay City, Tex., under the designation EXXAIRE.
  • Suitable breathable composite materials comprising polymer blends are available from Clopay Corporation, Cincinnati, Ohio under the name HYTREL blend P18-3097.
  • Diapers 20 according to the present invention may be provided with a re-closable fastening system (not shown) or may alternatively be provided in the form of pant-type diapers.
  • the diaper 20 may also include such other features (not shown) as are known in the art including front and rear ear panels, re-closable fastening system, lotion, waist cap features, pant type diapers, elastics and the like to provide better fit, containment and aesthetic characteristics. Additional illustrative, but non-limiting, information on construction, assembly, and the various components of disposable diapers may be found in U.S. Pat. No. 3,860,003 to Buell; U.S. Pat. No. 5,151,092 to Buell; U.S. Pat. No. 5,221,274 to Buell; U.S. Pat. No. 5,554,145 to Roe et al. on Sep. 10, 1996; U.S. Pat. No.
  • the absorbent core 10 in FIG. 1 generally is disposed between the topsheet 24 and the backsheet 26 .
  • the absorbent core 10 comprises a durable hydrophilic fluid pervious core wrap 42 , (also referred to herein as durable hydrophilic core wrap, or core wrap) described in more detail herein, and a storage layer 60 as shown in FIG. 2.
  • the storage layer 60 may comprise any absorbent material that is generally compressible, conformable, non-irritating to the wearer's skin, and capable of absorbing and retaining liquids such as urine and other certain body exudates.
  • the storage layer 60 may comprise a wide variety of liquid-absorbent materials commonly used in disposable diapers and other absorbent articles such as comminuted wood pulp, which is generally referred to as air felt or fluff.
  • suitable absorbent materials include creped cellulose wadding; melt blown polymers, including co-form; chemically stiffened, modified or cross-linked cellulosic fibers; tissue, including tissue wraps and tissue laminates, absorbent foams, absorbent sponges, superabsorbent polymers (such as superabsorbent fibers), absorbent gelling materials, or any other known absorbent material or combinations of materials.
  • the storage layer is air felt free, that is, it contains no air felt.
  • the storage layer may further comprise minor amounts (typically less than 10%) of non-liquid absorbent materials, such as adhesives, waxes, oils and the like.
  • Exemplary absorbent structures for use as the absorbent assemblies are described in U.S. Pat. No. 4,834,735, entitled “High Density Absorbent Members Having Lower Density and Lower Basis Weight Acquisition Zones”, issued to Alemany et al. on May 30, 1989; and U.S. Pat. No. 5,625,222 entitled “Absorbent Foam Materials For Aqueous Fluids Made From high Internal Phase Emulsions Having Very High Water-To-Oil Ratios” issued to DesMarais et al. on Jul. 22, 1997.
  • FIG. 2 is a sectional view along 2 - 2 showing a section of one alternative embodiment of the absorbent core 10 of the diaper of FIG. 1.
  • the storage layer 60 is wrapped by a core wrap 42 in a in a C-fold.
  • the core wrap 42 comprises a substrate which has been coated with a hydrophilicity boosting composition which contains nanoparticles 75 .
  • the substrate may be a nonwoven, a polymeric film or combinations thereof.
  • the substrate, hydrophilicity boosting composition, the nonwoven, and the porous polymeric film are all exemplified in more detail herein.
  • the durable hydrophilic core wrap of the present invention provides a substrate which has both an extended shelf life and wear life.
  • Prior high-energy treatments tended to have a short shelf life. That is, during the time from purchase to ultimate use and disposal by the consumer the substrate would trend to loose its hydrophilicity.
  • Surfactant treatments such as those of the prior art, on the other hand would often have an adequate shelf life, but have an inadequate wear life. That is, upon contact with bodily fluids, such as urine, the substrate would instantly being to loose its hydrophilic properties. This may even lead to a surface which repels the bodily fluids it is designed to absorb even though the absorbent article has not reached its total absorbance capacity.
  • the hydrophilic core wrap of the present invention suffers neither of these limitations as the substrates treated with the hydrophilicity boosting composition of the present invention have a long shelf life and long wear life, that is the hydrophilic properties of the core wrap are not substantially lost over time or upon contact with bodily fluids such as urine.
  • the hydrophilic core wrap has a wash-off surface tension of greater than about 65 mN/m, when tested in accordance with the Determination of surface tension Test in the Test Methods section and further described herein.
  • the absorbent core comprises, in addition to the storage layer and the durable hydrophilic core wrap, an acquisition system, which comprises an upper acquisition layer facing towards the wearer and a lower acquisition layer.
  • the upper acquisition layer comprises a nonwoven fabric whereas the lower acquisition layer preferably comprises a mixture of chemically stiffened, twisted and curled fibers, high surface area fibers and thermoplastic binding fibers.
  • both acquisition layers are provided from a non-woven material, which is preferably hydrophilic.
  • the acquisition layer preferably is in direct contact with the storage layer.
  • the storage layer or parts thereof, such as the upper acquisition layer may optionally be coated with the hydrophilicity boosting composition.
  • FIG. 3 is a sectional view along 2 - 2 showing a section of one alternative embodiment of the absorbent core 10 of the diaper of FIG. 1.
  • the storage layer 60 is surrounded or enveloped by the core wrap 42 .
  • the core wrap 42 comprises a substrate which has been coated with a hydrophilicity boosting composition, both of which are exemplified in more detail herein.
  • FIG. 4 is a sectional view along 2 - 2 showing a section of one alternative embodiment of the absorbent core 10 of the diaper of FIG. 1.
  • the storage layer 60 is surrounded or enveloped by the core wrap 42 .
  • the core wrap 42 comprises a fluid receiving top layer 70 and a bottom layer 80 .
  • the fluid receiving top layer 70 and the bottom layer 80 can be same or different. That is they may be the same substrate coated with the same hydrophilicity boosting composition, the different substrates coated with the same hydrophilicity boosting composition or different substrates coated with different hydrophilicity boosting composition, etc.
  • the top layer 70 and the bottom layer 80 may comprise non-woven material.
  • One preferred material is a so-called SMS material, comprising a spunbonded, a melt-blown and a further spunbonded layers.
  • the top layer 70 and the bottom layer 80 may be provided from two or more separate sheets of nonwoven materials or they may be alternatively provided from a unitary sheet of material. SMS materials are exemplified in more detail herein.
  • FIG. 5 is a sectional view along 2 - 2 showing a section of the absorbent core 10 of the diaper of FIG. 1.
  • the storage layer 60 is wrapped by a core wrap 42 in a in a C-fold.
  • the core wrap 42 comprises two portions: a portion which has been coated with the hydrophilicity boosting composition, or coated portion 90 , and a portion which is not coated with the hydrophilicity boosting composition, or uncoated portion 30 .
  • FIG. 6 is a sectional view along 2 - 2 showing a section of one alternative embodiment of the absorbent core 10 of the diaper of FIG. 1.
  • the storage layer 60 is surrounded or enveloped the core wrap 42 .
  • the core wrap 42 comprises a top layer 70 , which has been coated with the hydrophilicity boosting composition, and forms a coated portion 90 ; and a bottom layer 80 which is not coated with the hydrophilicity boosting composition, and forms an uncoated portion 30 .
  • the uncoated portion 30 may be optionally coated with a different composition to give it different physical properties the coated portion 90 .
  • the uncoated portion 30 may be coated with a composition to make it more hydrophobic, or it is coated with a hydrophilicity boosting composition different to that used to coat the coated portion 90 .
  • the durable hydrophilic core wrap of the present invention will preferably have a basis weight of between about 1 grams per square meter (or gsm) and about 100 gsm, more preferably between about 2 gsm and about 50 gsm, even more preferably between about 5 gsm and about 30 gsm.
  • the durable hydrophilic core wrap of the present invention comprises a core wrap substrate (substrate) which has been coated with a hydrophilicity boosting composition.
  • the substrate of interest herein may comprise any known type of substrate, including but not limited to fabrics, garments, textiles, and films.
  • the substrate may comprise one or more fibers.
  • a fiber is defined as a fine hairlike structure, of animal, vegetable, mineral, or synthetic origin.
  • fibers have diameters ranging from less than about 0.001 mm (about 0.00004 in) to more than about 0.2 mm (about 0.008 in) and they come in several different forms: short fibers (known as staple, or chopped), continuous single fibers (filaments or monofilaments), untwisted bundles of continuous filaments (tow), and twisted bundles of continuous filaments (yarn).
  • the substrate may comprise fibers made by nature (natural fibers), made by man (synthetic or man-made), or combinations thereof.
  • Example natural fibers include but are not limited to: animal fibers such as wool, silk, fur, and hair; vegetable fibers such as cellulose, cotton, flax, linen, and hemp; and certain naturally occurring mineral fibers.
  • Synthetic fibers can be derived from natural fibers or not.
  • synthetic fibers which are derived from natural fibers include but are not limited to, rayon and lyocell, both of which are derived from cellulose.
  • Synthetic fibers which are not derived from natural fibers can be derived from other natural sources or from mineral sources.
  • Exemplary synthetic fibers derived from natural sources include but are not limited to, polysaccharides such as starch.
  • Exemplary fibers from mineral sources include but are not limited to, polyolefin fibers such as polypropylene and polyethylene fibers, which are derived from petroleum, and silicate fibers such as glass and asbestos.
  • Synthetic fibers are commonly formed, when possible, by fluid handling processes (e.g., extruding, drawing, or spinning a fluid such as a resin or a solution). Synthetic fibers are also formed by solid handling size reduction processes (e.g., mechanical chopping or cutting of a larger object such as a monolith, a film, or a fabric).
  • suitable synthetic fibers which may comprise all or part of the core wrap substrates of the present invention include but are not limited, to nylon (polyamide), acrylic (polyacrylonitrile), aramid (aromatic polyamide), polyolefin (polyethylene and polypropylene), polyester, butadiene-styrene block copolymers, natural rubber, latex, spandex (polyurethane) and combinations thereof.
  • Synthetic fibers that contain more than one type of repeat unit can result from combining repeat units at the molecular level within each macromolecular strand (co-polymer), between macromolecular strands (homopolymer blends), or combinations thereof (co-polymer blends); or they can result from combining repeat units at a higher scale level with distinct nanoscopic, microscopic, or macroscopic phases (e.g., multicomponent fibers).
  • Each component of a multicomponent fiber can comprise a homopolymer, a co-polymer, or blends thereof.
  • Bicomponent fibers are common versions of multicomponent fibers.
  • the two or more types of repeat units in a copolymer can be arranged randomly or in alternating blocks of each type. Blocks of different types of repeat units can joined to one another at their respective ends (block co-polymers) or between the respective end of at least one block (graft co-polymers).
  • Nonwoven materials are a type of fabric typically made from fibers in a web format. Nonwoven materials are described by Butler I, Batra S K, et al, Nonwovens Fabrics Handbook, Association of the Nonwoven Fabrics Industry, 1999, and by Vaughn E A, Nonwoven Fabric Sampler and Technology Reference, Association of the Nonwoven Fabrics Industry.
  • Substrates comprising nonwoven materials can be formed by direct extrusion processes during which the fibers and the nonwoven materials are formed at about the same point in time, or by preformed fibers which can be laid into nonwoven materials at a distinctly subsequent point in time.
  • Exemplary direct extrusion processes include but are not limited to: spunbonding, meltblowing, solvent spinning, electrospinning, and combinations thereof typically forming layers.
  • Exemplary “laying” processes include wetlaying and drylaying.
  • Example drylaying processes include but are not limited to airlaying, carding, and combinations thereof typically forming layers. Combinations of the above processes yield nonwovens commonly called hybrids or composites.
  • Exemplary combinations include but are not limited to spunbond-meltblown-spunbond (SMS), spunbond-carded (SC), spunbond-airlaid (SA), meltblown-airlaid (MA), and combinations thereof, typically in layers.
  • Combinations which include direct extrusion can be combined at the about the same point in time as the direct extrusion process (e.g., spinform and coform for SA and MA), or at a subsequent point in time.
  • one or more individual layers can be created by each process.
  • SMS can mean a three layer, ‘sms’ nonwoven materials, a five layer ‘ssmms’ nonwoven materials, or any reasonable variation thereof wherein the lower case letters designate individual layers and the upper case letters designate the compilation of similar, adjacent layers.
  • the fibers in nonwoven materials are typically joined to one or more adjacent fibers at some of the overlapping junctions. This includes joining fibers within each layer and joining fibers between layers when there is more than one layer. Fibers can be joined by mechanical entanglement, by chemical bond or by combinations thereof.
  • Fibers and nonwoven materials can be subjected to additional treatment after formation.
  • additional treatment commonly occurs after the fibers are joined to one another (post-treatment).
  • additional treatments include but are not limited to mechanical stresses, chemical additives, or combinations thereof.
  • core wrap substrate includes laminates of two or more substrates or webs. Commercially available laminates, or purpose built ones would also be within the scope of the present invention. Additionally, the substrates may be flat or textured. The formation of textured substrates and laminates forms no part of this invention. The following discussion is for convenience of formulation, but is not intended to limit the type of substrate used herein.
  • the substrate is treated with a high-energy surface treatment.
  • This high-energy treatment may be prior to or concurrent with the coating of the substrate with the hydrophilicity boosting composition.
  • the high-energy treatment may be any suitable high-energy treatment for increasing the hydrophilicity of a substrate. Suitable high-energy treatments, include but are not limited to, corona discharge treatment, plasma treatment, UV radiation, ion beam treatment, electron beam treatment and combinations thereof.
  • High-energy surface treatments which increase surface energy are useful in that in combination with the nanoparticles they can provide the surface with durable hydrophilic properties.
  • increased surface energy increases the wettability of the substrate without use of surfactants in the dispersion to achieve wetting. Avoiding use of surfactant is useful for reasons previously discussed.
  • corona treatment places transient charges on fibrous thermoplastic surfaces. As discussed earlier, partial or full charges dissipate over time, and maintaining partial or full charges on fibrous thermoplastic surfaces is a common limitation. However, it has been found that corona treatment in combination with the nanoparticles can be used to place a durable charge on the material so that water continues to be attracted to the material after time elapses.
  • nanoparticles in conjunction with high-energy surface treatments, can convert the transient properties of such treatments to more durable properties.
  • corona treatment of a 13 gram per square meter hydrophobic SMS polypropylene nonwoven subsequently treated with a hydrophilicity boosting compositions and dried exhibited consistently fast strikethrough following multiple gushes or insults.
  • the corona treatment increased the surface energy for the fiber.
  • the hydrophilicity boosting compositions without a surfactant was brought into contact with the fiber surfaces before the charges could dissipate. The higher surface energy enabled the dispersion to wet the fibrous surfaces better than would have been possible without the corona treatment.
  • the nanoparticles associate with the partial or full charge on the surface which would otherwise be transient. This association may take the form of a van der Waals interaction or the form of some other interaction or bond.
  • the nanoparticles are sufficiently small to render the associations sufficient strong to withstand multiple strikethroughs.
  • the nanoparticle is sufficiently large to resist rotation away from oxygen into the polymer or dissipate in general.
  • hydrophilicity Boosting Composition The hydrophilicity boosting compositions of the present invention comprise a hydrophilicity boosting amount of nanoparticles.
  • hydrophilicity boosting amount it is intended that an amount of nanoparticles be present in the hydrophilicity boosting compositions which are sufficient to make a substrate to which it is applied more hydrophilic.
  • Such amounts are readily ascertained by one of ordinary skill in the art and are based on many factors, including but not limited to, the substrate used, the nanoparticles used, the desired hydrophilicity of the durable hydrophilic core wrap, the consumer product in which the absorbent core is used, etc.
  • the nanoparticles are present in the hydrophilicity boosting compositions at levels of from about 0.0001% to about 20%, preferably from about 0.001% to about 15%, and more preferably from about 0.001% to about 10%, by weight of the composition.
  • the amount of hydrophilicity boosting compositions present on a core wrap substrate will vary depending upon many factors, including but not limited to, the substrate used, the nanoparticles used, the desired hydrophilicity of the durable hydrophilic core wrap, the consumer product in which the absorbent core is used, etc.
  • the amount of hydrophilicity boosting compositions on the core wrap substrate will be present invention will be between about 0.01 grams of hydrophilicity boosting composition per square meter of substrate (or gsm substrate) and about 30 gsm substrate, more preferably between about 0.01 gsm substrate and about 20 gsm substrate, even more preferably between about 0.1 gsm substrate and about 10 gsm substrate.
  • the nanoparticles are applied to the substrate as a dispersion in a carrier.
  • Nanoparticles are particles which have a particle size, that is diameter, which is of the order of magnitude of nanometers. That is, nanoparticles have a particle size ranging from about 1 to about 750 nanometers. Such particles are technologically significant since they are utilized to produce durable hydrophilic core wraps that have novel and useful properties due to the very small dimensions of their particulate constituents. Nanoparticles with particle sizes ranging from about 2 nm to about 750 nm can be economically produced.
  • Non-limiting examples of particle size distributions of the nanoparticles are those that fall within the range from about 2 nm to less than about 750 nm, alternatively from about 2 nm to less than about 200 nm, and alternatively from about 2 nm to less than about 150 nm.
  • the particle size of the nanoparticles is the largest diameter of a nanoparticle.
  • the mean particle size of various types of nanoparticles may differ from the particle size distribution of the nanoparticles particles.
  • a layered synthetic silicate can have a mean particle size of about 25 nanometers while its particle size distribution can generally vary between about 10 nm to about 40 nm.
  • the particle sizes that are described herein are for particles when they are dispersed in an aqueous medium and the mean particle size is based on the mean of the particle number distribution.
  • Non-limiting examples of nanoparticles can include crystalline or amorphous particles with a particle size from about 2 to about 750 nanometers.
  • Boehmite alumina can have an average particle size distribution from 2 to 750 nm.
  • the hydrophilicity boosting composition When the hydrophilicity boosting composition is present on the substrate it will typically be a substantially uniform coating. When the hydrophilicity boosting composition dries, for example any water evaporates, the nanoparticles may aggregate together on the substrate forming larger particles, or even appear film like, depending upon the observation method used. In any event, the application of a hydrophilicity boosting composition comprising nanoparticles, provides for a uniform coat of the substrate.
  • Either organic or inorganic nanoparticles may be used in the hydrophilicity boosting composition of the present invention.
  • Suitable organic nanoparticle include, but are not limited to, nanolatexes.
  • a “nanolatex”, as used herein, is a latex with particle sizes less than or equal to about 750 nm.
  • a “latex” is a colloidal dispersion of water-insoluble polymer particles that are usually spherical in shape. Nanolatexes may be formed by emulsion polymerization.
  • “Emulsion polymerization” is a process in which monomers of the latex are dispersed in water using a surfactant to form a stable emulsion followed by polymerization. Particles are produced with can range in size from about 2 to about 600 nm.
  • inorganic nanoparticles are preferred.
  • Inorganic nanoparticles generally exist as oxides, silicates, carbonates and hydroxides.
  • Some layered clay minerals and inorganic metal oxides can be examples of nanoparticles.
  • the layered clay minerals suitable for use in the present invention include those in the geological classes of the smectites, the kaolins, the illites, the chlorites, the attapulgites and the mixed layer clays. Typical examples of specific clays belonging to these classes are the smectices, kaolins, illites, chlorites, attapulgites and mixed layer clays.
  • Smectites include montmorillonite, bentonite, pyrophyllite, hectorite, saponite, sauconite, nontronite, talc, beidellite, volchonskoite and vermiculite.
  • Kaolins include kaolinite, dickite, nacrite, antigorite, anauxite, halloysite, indellite and chrysotile.
  • Illites include bravaisite, muscovite, paragonite, phlogopite and biotite.
  • Chlorites include corrensite, penninite, donbassite, sudoite, pennine and clinochlore.
  • Attapulgites include sepiolite and polygorskyte.
  • Mixed layer clays include allevardite and vermiculitebiotite. Variants and isomorphic substitutions of these layered clay minerals offer unique applications.
  • Layered clay minerals may be either naturally occurring or synthetic.
  • An example of one non-limiting embodiment of the coating composition uses natural or synthetic hectorites, montmorillonites and bentonites.
  • Another embodiment uses the hectorites clays commercially available, and typical sources of commercial hectorites are the LAPONITEs TM from Southern Clay Products, Inc., U.S.A; Veegum Pro and Veegum F from R. T. Vanderbilt, U.S.A.; and the Barasyms, Macaloids and Propaloids from Baroid Division, National Read Comp., U.S.A.
  • the nanoparticles comprise a synthetic hectorite a lithium magnesium silicate.
  • a lithium magnesium silicate is LAPONITETM, which has the formula:
  • the LAPONITETM is “modified” with a cationic organic compound, then the “counter-ion” could be viewed as being any cationic organic group (R).
  • LAPONITETM such as, LAPONITE BTM, LAPONITE STM, LAPONITE XLSTM, LAPONITE RDTM, LAPONITE XLGTM, and LAPONITE RDSTM.
  • the nanoparticles may also be other inorganic materials, including inorganic oxides such as, but not limited to, titanium oxide silica, zirconium oxide, aluminum oxide, magnesium oxide and combinations thereof.
  • inorganic oxides such as, but not limited to, titanium oxide silica, zirconium oxide, aluminum oxide, magnesium oxide and combinations thereof.
  • suitable inorganic oxides include various inorganic oxides of alumina and silica.
  • the nanoparticles comprise a Boehmite alumina ([Al(O)(OH)] n ) which is a water dispersible, inorganic metal oxide that can be prepared to have a variety of particle sizes or range of particle sizes, including a mean particle size distribution from about 2 nm to less than or equal to about 750 nm.
  • a boehmite alumina nanoparticle with a mean particle size distribution of around 25 nm under the trade name Disperal P2TM and a nanoparticle with a mean particle size distribution of around 140 nm under the trade name of Dispal® 14N4-25 are available from North American Sasol, Inc.
  • the nanoparticles are selected from the group consisting of titanium dioxide, Boehmite alumina, sodium magnesium lithium fluorosilicates and combinations thereof.
  • compositions of the present invention may also include optional ingredients such as, a carrier, surfactant and adjunct ingredients.
  • Optional ingredients when present, are typically employed in compositions at levels of from about 0.001% to about 99.9%, preferably from about 0.01% to about 98%, and more preferably from about 0.1% to about 96%, by weight of the composition.
  • Suitable carriers include liquids, solids and gases.
  • One preferred carrier is water, which can be distilled, deionized, or tap water. Water is valuable due to its low cost, availability, safety, and compatibility.
  • the carrier can comprise a low molecular weight organic solvent.
  • the solvent is highly soluble in water, e.g., ethanol, methanol, acetone, ethylene glycol, propanol, isopropanol, and the like, and mixtures thereof.
  • Low molecular weight alcohols can reduce the surface tension of the nanoparticle dispersion to improve wettability of the substrate. This is particularly helpful when the substrate is hydrophobic. Low molecular weight alcohols can also help the treated substrate to dry faster.
  • the optional water soluble low molecular weight solvent can be used at any suitable level.
  • the carrier can comprise any suitable amount of the composition, including but not limited to from about 10% to about 99%, alternatively from about 30% to about 95%, by weight of the coating composition.
  • Surfactants are an optional ingredient in some embodiments of the present invention. Surfactants are especially useful in the coating composition as wetting agents to facilitate the dispersion of nanoparticles onto the substrate. Surfactants are preferably included when the coating composition is used to treat a hydrophobic substrate.
  • Suitable surfactants can be selected from the group including anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants, ampholytic surfactants, zwitterionic surfactants and mixtures thereof.
  • Nonlimiting examples of surfactants useful in the compositions of the present invention are disclosed in McCutcheon's, Detergents and Emulsifiers, North American edition (1986), published by Allured Publishing Corporation; McCutcheon's, Functional Materials, North American Edition (1992); U.S. Pat. Nos. 5,707,950 and 5,576,282; and U.S. Pat. No. 3,929,678, to Laughlin et al., issued Dec. 30, 1975.
  • a surfactant when used in the coating composition, it may be added at an effective amount to provide facilitate application of the coating composition.
  • Surfactant when present, is typically employed in compositions at levels of from about 0.0001% to about 60%, preferably from about 0.001% to about 35%, and more preferably from about 0.001% to about 25%, by weight of the composition.
  • Nonlimiting examples of surfactants include preferred nonionic surfactants, useful herein typically at levels from about 0.001% to about 60%, by weight, include nonionic and amphoteric surfactants such as the C 12 -C 18 alkyl ethoxylates (“AE”) including the so-called narrow peaked alkyl ethoxylates and C 6 -C 12 alkyl phenol alkoxylates (especially ethoxylates and mixed ethoxy/propoxy), C 12 -C 18 betaines and sulfobetaines (“sultaines”), C 10 -C 18 amine oxides, and the like.
  • AE alkyl ethoxylates
  • sulfobetaines especially ethoxylates and mixed ethoxy/propoxy
  • C 10 -C 18 amine oxides and the like.
  • silicone surfactants are silicone surfactants and/or silicones. They can be used alone and/or alternatively in combination with the alkyl ethoxylate surfactants described herein.
  • Nonlimiting examples of silicone surfactants are the polyalkylene oxide polysiloxanes having a dimethyl polysiloxane hydrophobic moiety and one or more hydrophilic polyalkylene side chains, and having the general formula:
  • a+b are from about 1 to about 50, and each R 1 is the same or different and is selected from the group consisting of methyl and a poly(ethyleneoxide/propyleneoxide) copolymer group having the general formula: —(CH 2 ) n O(C 2 H 4 O) c (C 3 H 6 O) d R 2 , wherein n is 3 or 4; total c (for all polyalkyleneoxy side groups) has a value of from 1 to about 100, alternatively from about 6 to about 100; total d is from 0 to about 14; alternatively d is 0; total c+d has a value of from about 5 to about 150, alternatively from about 9 to about 100 and each R 2 is the same or different and is selected from the group consisting of hydrogen, an alkyl having 1 to 4 carbon atoms, and an acetyl group, alternatively hydrogen and methyl group.
  • Each polyalkylene oxide polysiloxane has at least one R 1 group being a poly(ethyleneoxide/propyleneoxide) copolymer group.
  • Silicone superwetting agents are available from Dow Corning as silicone glycol copolymers (e.g., Q2-5211 and Q2-5212).
  • compositions can contain other optional adjunct ingredients, including but not limited to process aids, antimicrobial preservatives, antioxidants, anti-static agents, chelating agents, colorants, dyes, filler salts, fungicides, insect and moth repellant agents, germicides, hydrotropes, metallic salts.
  • process aids including but not limited to process aids, antimicrobial preservatives, antioxidants, anti-static agents, chelating agents, colorants, dyes, filler salts, fungicides, insect and moth repellant agents, germicides, hydrotropes, metallic salts.
  • optional ingredients may be included at any desired level, but are typically added at a level of from about 0.0001% to about 99.99% by weight of the composition.
  • the hydrophilicity boosting composition can be applied to the substrate in any suitable manner.
  • the hydrophilicity boosting composition can be applied to the substrate when the substrate is at least partially immersed in a bath of the composition (immersive processes), or without immersing the substrate in the coating composition (non-immersive processes).
  • the hydrophilicity boosting composition is applied by kiss-roll coating.
  • kiss-roll coating the composition is kept in a suitable bath.
  • a rotating cylinder or any other device suitable for this process is contacting the composition with at least a part of its surface.
  • the composition is spread on the surface of the cylinder.
  • the substrate is brought into contact with the cylinder while the cylinder already has the composition spread on its surface.
  • the amount of composition applied on the substrate can be controlled easily and it is possible to avoid soaking the substrate with composition.
  • the composition can also be sprayed on the surface of the plurality of fibers.
  • spraying enables low and easily controllable add-on level of aqueous solution, which is preferred in the present invention.
  • Other alternative methods include, but are not limited to, printing such as, rotary, gravure, flexographic printing, ink jet printing, slot coating and the like.
  • FIG. 7 illustrates one optional embodiment of manufacturing a disposable absorbent article, more specifically the step of producing an absorbent core.
  • a durable hydrophilic core wrap 42 is dispensed onto a conveyer belt 120 .
  • the durable hydrophilic core wrap 42 was previously formed by coating a substrate with a hydrophilicity boosting composition.
  • the durable hydrophilic core wrap 42 moves along the conveyer belt 120 to a point 130 where the components of the storage layer 60 are dispensed from bins 140 and 150 .
  • Air felt 160 dispensed from bin 150 mixes with absorbent gelling material 170 prior to deposition on the hydrophilic core wrap 42 at point 130 .
  • a portion of the storage layer 60 is surrounded by the durable hydrophilic core wrap 42 .
  • Examples surrounding the storage layer 60 such as encapsulating or enveloping, this may be found described herein with reference to FIGS. 2 to 6 inclusive.
  • the ends of the durable hydrophilic core wrap 42 are sealed. Suitable methods of sealing include, but are not limited to, adhesive, heat, ultrasonic and combinations thereof.
  • the formed absorbent core may then be further processed to incorporate it into a disposable absorbent article, such as in between the topsheet and backsheet of a disposable diaper.
  • Hydrophilicity boosting compositions are prepared as follows: % Wt of Component Component 1 2 3 4 5 6 7 8 9 10 11 12 13 Nanoparticle 1 0.1 0.05 0.05 0.1 1 Nanoparticle 2 0.1 0.05 0.05 0.1 Nanoparticle 3 1 1 4 Nanoparticle 4 1 Surfactant 5 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075 0.075
  • Test Methods Unless otherwise stated, all tests are performed under standard laboratory conditions (50% humidity and at 73° F. (23° C.)).
  • the surface tension (unit: mN/m) is determined according to the following test. Apparatus: Equipment: K10 tensiometer provided by Krüiss GmbH, Germany or equivalent. The vessel elevation speed should be 4 mm/min. Liquid surface height should be sensed automatically when using a plate or a ring. The equipment must be able to adjust the sample position automatically to the correct height. Precision of test should be +/ ⁇ 0.1 mN/m.
  • the nonwoven should have a basis weight of at least 10 grams per square meter (or gsm).
  • Liquid Strike-Through Test The liquid strike-through time is measured using Lister-type strike-through equipment, manufactured by Lenzing AG, Austria. Test procedure is based on standardized EDANA (European Disposables And Nonwovens Association) method 150.3-96, with the test sample placed on an absorbent pad comprised of ten plies of filter paper (Ahlstrom Grade 632 obtained from Empirical Manufacturing Co., Inc., or equivalent). In a typical experiment, three consecutive 5 ml gushes of test liquid (0.9% saline solution) are applied to a nonwoven sample at one minute intervals and the respective strike-through times are recorded without changing the absorbent pad.
  • EDANA European Disposables And Nonwovens Association
  • the test described below does not only measure the first gush but several subsequent gushes, especially the fifth gush.
  • FIGS. 8 9 , and 10 illustrate a Strike-through plate 200 containing electrodes 210 .
  • FIG. 8 is a top view of a Strike-through plate 200 , where as FIG.
  • FIG. 9 is a sectional view along 9 - 9 of the Strike-through plate 200 of FIG. 8.
  • FIG. 10 is a sectional perspective view along 10 - 10 of the Strike-through plate 200 of FIG. 8;
  • Base plate A square of acrylic glass 125 mm ⁇ 125 mm approximately;
  • Ring stand to support the funnel (iv) Electronic Timer measuring to 0.01 seconds;
  • Burette with 50 ml capacity (vii) Core filter paper Ahlström Grade 989 or equivalent (average Strike-through time 1.7 s+ ⁇ 0.3 s, dimensions: 10 ⁇ 10 cm).

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WO2004071341A2 (fr) 2004-08-26
MXPA05007935A (es) 2005-09-30
US7923597B2 (en) 2011-04-12
EP1592375A2 (fr) 2005-11-09
WO2004071341A3 (fr) 2005-04-14
JP2006513820A (ja) 2006-04-27
US20060253092A1 (en) 2006-11-09
CN1747704A (zh) 2006-03-15

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