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US20060172137A1 - Transverse-direction, elastomeric, breathable film - Google Patents

Transverse-direction, elastomeric, breathable film Download PDF

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Publication number
US20060172137A1
US20060172137A1 US11/048,408 US4840805A US2006172137A1 US 20060172137 A1 US20060172137 A1 US 20060172137A1 US 4840805 A US4840805 A US 4840805A US 2006172137 A1 US2006172137 A1 US 2006172137A1
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United States
Prior art keywords
multilayer film
additive
film
core layer
outer core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/048,408
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English (en)
Inventor
William Champion
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Pliant LLC
Original Assignee
Pliant LLC
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 Pliant LLC filed Critical Pliant LLC
Priority to US11/048,408 priority Critical patent/US20060172137A1/en
Assigned to PLIANT CORPORATION reassignment PLIANT CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAMPION, WILLIAM T.
Priority to EP06719872A priority patent/EP1843896A4/fr
Priority to CNA2006800036524A priority patent/CN101175630A/zh
Priority to CA002596162A priority patent/CA2596162A1/fr
Priority to PCT/US2006/003218 priority patent/WO2006083765A2/fr
Priority to MX2007009103A priority patent/MX2007009103A/es
Priority to JP2007554151A priority patent/JP2008538194A/ja
Priority to BRPI0606134-6A priority patent/BRPI0606134A/pt
Publication of US20060172137A1 publication Critical patent/US20060172137A1/en
Priority to US11/771,412 priority patent/US7799418B2/en
Assigned to MERRILL LYNCH BANK USA reassignment MERRILL LYNCH BANK USA PATENT SECURITY AGREEMENT Assignors: PLIANT CORPORATION, PLIANT CORPORATION INTERNATIONAL, PLIANT FILM PRODUCTS OF MEXICO, INC., PLIANT PACKAGING OF CANADA, LLC, PLIANT SOLUTIONS CORPORATION, UNIPLAST HOLDINGS INC., UNIPLAST U.S., INC.
Assigned to PLIANT CORPORATION reassignment PLIANT CORPORATION RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: MERRILL LYNCH BANK USA
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/14—Velocity, e.g. feed speeds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2555/00—Personal care
    • B32B2555/02—Diapers or napkins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249978—Voids specified as micro
    • Y10T428/24998—Composite has more than two layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249986—Void-containing component contains also a solid fiber or solid particle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/3154—Of fluorinated addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y10T428/31917—Next to polyene polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer
    • Y10T428/3192—Next to vinyl or vinylidene chloride polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31928—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31931—Polyene monomer-containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon

Definitions

  • the present invention relates generally to synthetic films and, more specifically, to a transverse-direction elastomeric film having a microporous, breathable structure.
  • the present film preferably has a five-layer structure having generally the following arrangement: skin/outer core/inner core/outer core/skin.
  • Plastic films are used in a variety of applications. Such films range from single-layer polymers to multilayer structures with various tie layers and copolymers included therein. The use of multiple layers allows for the custom adaptation of a film to meet certain property requirements, ranging from barrier requirements to strength requirements.
  • One use of such films is to provide a barrier layer in diapers, absorbent pads, and the like.
  • the product containing the film contacts human skin for a prolonged period of time, such as for example with diapers, the skin of the person being so contacted is likely to develop a rash or other irritation.
  • Conventional films do not adequately address this problem. What is needed, therefore, is a multilayer film adapted to provide the physical properties desired for films used in diapers and the like, while at the same time made breathable in order to reduce or eliminate rashes and other irritation.
  • the multilayer film of the present invention includes a first layer composed of at least one polyolefin polymer.
  • a second layer is also provided, including at least one polymer compound, which may be a polyolefin polymer, an ethylene copolymer resin, a styrene block copolymer, a fluoropolymer, polyvinylchloride, or any other suitable polymer or mixtures thereof.
  • the second layer of the multilayer film includes a metallocene-catalyzed polymer.
  • the second layer further includes an additive, such as calcium carbonate or other suitable additive.
  • the film of the present invention has five layers, including two skin layers preferably comprising low density polyethylene, two outer core layers, preferably comprising and additive and a styrene block copolymer, and an inner core layer, preferably comprising an additive and a styrene block copolymer.
  • the skin layers further include at least one additive, such as an antioxidant or antiblocking agent.
  • the outer core layers preferably include a metallocene-catalyzed polymer such as metallocene-catalyzed linear low density polyethylene.
  • the additive in the inner and outer core layers is preferably calcium carbonate.
  • FIG. 1 is a cross-sectional view of a five-layer film constructed in accordance with the teachings of the present invention.
  • the multilayer film of the present invention has a structure that includes at least one first layer of at least one polyolefin polymer, and at least one second layer which includes at least one compound selected from metallocene-catalyzed polyolefin polymers, ethylene copolymer resins, styrene-ethylene/butylene-styrene block copolymers, and mixtures thereof.
  • the total thickness of the film may vary depending upon the intended application of the film.
  • the preferred film has a thickness of from about 1.25 mils to about 1.5 mils and, more preferably, of about 1.34 mils (about 30 g/m 2 ).
  • the thickness of individual layers is preferably from about 0.025 mils to about 0.75 mils, and more preferably about 0.60 mils.
  • each skin layer comprises about 1%-2% by weight of the total film, or, preferably about 1%-1.5% by weight of the total film or more preferably, comprise about 1% by weight of the total film.
  • each outer core layer comprise about 18%-24%, by weight, of the total film, or preferably about 20%-24% by weight of the total film, or more preferably about 24% by weight of the total film.
  • the inner core comprise about 48%-60% by weight of the total film, or preferably about 48%054% by weight of the total film, or more preferably about 48% by weight of the total film. It will be appreciated by those skilled in the art, however, that the thickness of each individual layer may vary from the preferred thicknesses given above.
  • the multilayer film of the present invention may be produced by conventional methods used in producing multilayer films, including coextrusion and extrusion lamination techniques.
  • the film may be formed by coextrusion. Using this method, melted and plasticized streams of individual layer materials are fed into a coextrusion die. While in the die, the layers are juxtaposed and combined, after which they emerge from the die in a single multilayer film of polymeric material. Suitable coextrusion techniques are fully described in U.S. Pat. Nos. 5,139,878 and 4,677,017, incorporated herein by reference to the extent permitted by law. Coextrusion of the present film may be conducted at temperatures of from about 400° F. to about 510° F.
  • Coextrusion techniques include the use of a feed block with a standard die, a multi-manifold die, such as a circular die, as well as a multi-manifold die such as used in forming flat cast films and cast sheets.
  • the multilayer films of the present invention may also be made by blown film coextrusion.
  • the film is formed using a blown film apparatus composed of a multi-manifold circular die head having concentric circular orifices.
  • the multilayer film is formed by coextruding a molten layer through a circular die, and a molten layer on the other or each opposite side of the first layer through additional circular dies concentric with the first circular die.
  • a gas typically air
  • a jet that is concentric with the circular dies, thereby forming a bubble that expands the individual layers.
  • the bubble is collapsed onto itself to form a pair of multilayer films attached at two opposite edges.
  • the pair of attached multilayer films are then cut apart at one or more of the edges and separated into a pair of multilayer films that can be rolled up. It is preferred that the films of the present invention are geared from a flat cast process. An example of the preferred process is provided below.
  • a preferred method for producing the films of the present invention is now described.
  • components are blended at a loss-in-weight blender and combined in the desired proportions (described more fully with respect to specific films, below), then sent to the feed portion of an extruder.
  • This process allows for dry-blending of ingredients, thereby avoiding the need to utilize more expensive, fully compounded blends.
  • Dedicated extruders mix, melt, and meter the components to a specific film layer.
  • a feed block and flow plate channel three melt streams into a five layer configuration.
  • the three melt streams are A) the outer core; B) the skin; and C) the inner core.
  • the five layer configuration of the melt streams is as follows: B-A-C-A-B.
  • a flat, single slot die extrudes the film onto a smooth chill cast roll, producing the flat film product.
  • a series of pre-heat, draw, and annealing rolls provide the film with sufficient machine-direction orientation to induce the formation of micro voids in the structure. These pores allow for water vapor transmission, but are too small to allow passage of liquid.
  • the process of machine-direction orientation also results in minimal forces required for transverse-direction elongation.
  • the choice of elastomeric material helps ensure adequate stretch and recovery, and conformance to stated physical property requirements.
  • Machine-direction relaxation follows, to minimize film shrinkage in subsequent, downstream operations. The film is allowed to retract 10%-25% prior to winding.
  • the outer skin layers each comprise about 1%-2% by weight of the total film, and are preferably comprised of at least one polyolefin polymer.
  • Preferred polyolefin polymers include polyethylene, polypropylene, polybutenes, polyisoprenes, copolymers thereof, terpolymers thereof, ⁇ -olefin propylene copolymers, and mixtures thereof. Any other suitable polyolefin polymers may be used.
  • Suitable polyethylenes include, in particular, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), and ultra low density polyethylene (ULDPE). Particularly preferred is “barefoot” grade LDPE.
  • Preferred propylene polymers generally have a melting point of 180° C. or above.
  • Preferred propylene polymers further generally have a melt flow index of from about 0.5 g/10 min to about 10 g/10 min at 230° C., and a force of about 21.6N.
  • the skin layers serve, among other functions, to protect from die buildup, and to minimize or prevent film blocking or sticking.
  • the skin layers may further include additives such as antioxidants or antiblocking agents.
  • the outer core layers each comprise about 18%-24%, and preferably about 24%, by weight of the film as a whole.
  • Each outer core layer preferably comprises about 67% by weight of a neutralizer, such as CaCO 3 (preferably provided in the form of a calcium carbonate super concentrate, described below), about 26% by weight of a styrene-ethylene/butylene-styrene (SEBS) polymer, such as, for example, Kraton 1657 available from Kraton Polymers (Houston, Tex.), and about 7% by weight of a metallocene-catalyzed polyolefin polymer, such as, for example, the ethylene ⁇ -olefin resin Dow PL 1280, available from Dow Chemical Company (Midland, Mich.).
  • a neutralizer such as CaCO 3 (preferably provided in the form of a calcium carbonate super concentrate, described below)
  • SEBS styrene-ethylene/butylene-styrene
  • SEBS s
  • Suitable elastomers may be used in place of the SEBS polymer described above, such as Kraton 6571 and Kraton 6936.
  • suitable metallocene-catalyzed polymers may be used in place of the metallocene-catalyzed polyolefin polymers described above.
  • the outer core layers serve, among other functions, to provide breathability, some elastomeric performance, durability (with metallocene-catalyzed polymer), and block-resistant qualities.
  • the inner core layer comprises approximately 48%-60% by weight of the film.
  • the inner core layer preferably comprises about 67% by weight of a neutralizer such as CaCO 3 (preferably provided in the form of a calcium carbonate super concentrate, described below), and about 33% by weight of a high SEBS block copolymer, such as, for example, Kraton G1657.
  • a neutralizer such as CaCO 3
  • a high SEBS block copolymer such as, for example, Kraton G1657.
  • Other suitable compounds such as styrene-ethylene/butylenes-styrene thermoplastic elastomers, or high performance thermoplastic rubbers may also be used.
  • the inner core serves, among other functions, to provide breathability and elastic performance to the film.
  • the calcium carbonate additive in the inner and outer core layers of the present invention may be provided in any suitable manner, but is preferably provided in the form of a calcium carbonate super concentrate.
  • This super concentrate preferably contains about 75% Omya 2SST calcium carbonate with stearic acid coating, about 0.18% B-900 antioxidant (available from Ciba Specialty Chemicals, Tarrytown, N.Y.), about 12.41% Dowlex 2517 LLDPE, and about 12.41% Dowlex 2035 LLDPE.
  • additives may be added to one or more layers of the film of the present invention in order to improve certain characteristics of the particular layer.
  • Preferred additives include color concentrates, neutralizers, process aids, lubricants, stabilizers, hydrocarbon resins, antistatics, and antiblocking agents.
  • a color concentrate may be added to yield a colored layer, an opaque layer, or a translucent layer.
  • Preferred color concentrates include color formulations, including black, white, and other colors suitable for the film of the present invention.
  • Preferred color concentrates include Ampacet® white PE masterbatch, available from Ampacet Corporation (Tarrytown, N.Y.).
  • the carrier resin of Ampacet® white PE masterbatch is a LLDPE having a melt index of 20 g/10 min and a density of 0.92 g/cc. This concentrate has a nominal specific gravity of 2.06, a melt index of 3-23 g/10 min, and nominally contains 75% ash.
  • Another preferred color concentrate includes Ampacet® white HDPE masterbatch, the carrier resin of which is a HD/LLDPE having a nominal melt index of 10 g/10 min and a density of 0.96 g/cc. This concentrate has a nominal specific gravity of 1.54, a melt index of 9-15 g/10 min, and a pigment composed of 50% TiO 2 .
  • Suitable neutralizers include calcium carbonate, as indicated above, and calcium stearate. Preferred neutralizers have an absolute particle size of less than 10 ⁇ m and a specific surface area of at least 40 m 2 /g.
  • Polymeric processing aids may also be used in a layer. Fluoropolymers, fluoropolymer blends, and fluoroelastomers are particularly preferred, but any processing aid known in the art for use in polymer films is suitable.
  • a particularly preferred processing aid is Ampacet® Process Aid PE masterbatch, having an LLDPE carrier resin with a nominal melt index of 2 g/10 min and a density of 0.918 g/cc. The concentrate therein has a nominal specific gravity of 0.91, a nominal melt index of 1-3 g/10 min, and contains 3% ash.
  • Lubricants that may be used in accordance with the present invention include higher aliphatic acid esters, higher aliphatic acid amides, metal soaps, polydimethylsiloxanes, and waxes.
  • Conventional stabilizing compounds for polymers of ethylene, propylene, and other ⁇ -olefins are preferably employed in the present invention.
  • alkali metal carbonates, alkaline earth metal carbonates, phenolic stabilizers, alkali metal stearates, and alkaline earth metal stearates are preferentially used as stabilizers for the composition of the present invention.
  • Hydrocarbon resins and, in particular, styrene resins, terpene resins, petroleum resins, and cyclopentadiene resins have been found to be suitable as additives in order to improve desirable physical properties of the film. These properties may include water vapor permeability, shrinkage, film rigidity, and optical properties.
  • adhesive resins are preferred.
  • a particularly preferred adhesive resin is sold under the trademark Bynel® by DuPont Corporation and is primarily composed of maleic anhydride modified polyolefin with some residual maleic anhydride and may also contain small amounts of stabilizers, additives and pigments.
  • Preferred antistatics include substantially straight-chain and saturated aliphatic, tertiary amines containing an aliphatic radical having 10-20 carbon atoms that are substituted by ⁇ -hydroxy-(C 1 -C 4 )-alkyl groups, and N,N-bis-(2-hydroxyethyl)alkylamines having 10-20 carbon atoms in the alkyl group.
  • Other suitable antistatics include ethoxylated or propoxylated polydiorganosiloxanes such as polydialkysiloxanes and polyalkylphenylsiloxanes, and alkali metal alkanesulfonates.
  • Preferred antiblocking agents include organic polymers such as polyamides, polycarbonates, and polyesters. Other preferred agents include calcium carbonate, aluminum silicate, magnesium silicate, calcium phosphate, silicon dioxide, and diatomaceous earth.
  • the film structure is a five-layer structure.
  • the five-layer construction allows the highest content of elastomer to be buried inside the inner core layer. This permits other components to function as a protective outer core layers to minimize or prevent layers of film from sticking or blocking by minimizing the content of tacky, sticky elastomer in the outer core, and also permits the use of metallocene-catalyzed polyolefin polymer in outer core layers in order to encapsulate the inner core and provide film toughness.
  • the five-layer configuration permits the use of a thin, protective LDPE outer skin to provide protection from die build up during the film casting process. Because of these advantages, the five-layer embodiment of the present film described above it preferred. It will, however, be appreciated by those skilled in the art upon reading this disclosure that an alternate number of layers could also be used.
  • a five-layer film having a total thickness of about 1.5 mils was produced using the formula set forth in Table 1.
  • Table 1 Layer Formulation Percent (w) Layer of Film Polymer Additive Metallocene 1 (skin) 1% LDPE 0 0 2 (outer core) 18% 23% SEBS 67% CaCO 3 7% ethylene ⁇ - olefin resin 3 (inner core) 62% 33% SEBS 67% CaCO 3 0 4 (outer core) 18% 23% SEBS 67% CaCO 3 7% ethylene ⁇ - olefin resin 5 (skin) 1% LDPE 0 0 0
  • the films described in tables 1 and 2 were produced by the following process.
  • the film was produced by a coextrusion method, with LDPE present in the skin layer extruder such that a 1% LDPE skin layer was produced on either side of the film.
  • Casting began at a chill roll speed of about 50 meters/minute (about 150 feet/min), with the chill roll speed being gradually increased to a speed of up to about 75 meters/min (225 f/min).
  • Unstretched film thickness was calculated to be about 3.4 mils.
  • MDO temperature was adjusted to 130° F. in preheat, 125-130° F. in stretch zones, and 170-175° F. in the final two rolls in the MDO in order to anneal the film.
  • a stretch ratio of about 3.85 ⁇ to about 4 ⁇ was used to observe film stretching and check film properties. The film was retracted approximately 18% in the MDO.
  • a five-layer film having a total film thickness of about 1.50 mils was produced using the formula set forth in Table 3.
  • Table 3 TABLE 3 Formulation C - 5 Layer Formulation Percent (w) Layer of Film Polymer Additive Metallocene 1 (skin) 1% LDPE 0 0 2 (outer core) 18% 23% Kraton 67% CaCO 3 7% Dow 1657 PL1280 3 (inner core) 62% 33% Kraton 67% CaCO 3 0 Blend (20% 1657 + 80% other SEBS thermoplastic elastomer) 4 (outer core) 18% 23% Kraton 67% CaCO 3 7% Dow 1657 PL1280 5 (skin) 1% LDPE 0 0 0
  • a five-layer film having a total film thickness of about 1.5 mils was produced using the formula set forth in Table 3.
  • Table 3 TABLE 4 Formulation D - 5 Layer Formulation Percent (w) Layer of Film Polymer Additive Metallocene 1 (skin) 1% LDPE 0 0 2 (outer core) 18% 23% Kraton 67% CaCO 3 7% Dow 1657 PL1280 3 (inner core) 62% 33% Kraton 67% CaCO 3 0 Blend (40% 1657 + 60% other SEBS thermoplastic elastomer) 4 (outer core) 18% 23% Kraton 67% CaCO 3 7% Dow 1657 PL1280 5 (skin) 1% LDPE 0 0 0
  • the film was tested for elastic performance and breathability. For elasticity, a two cycle test was used to determine load loss and percent set. The two cycle test was done up to 70% elongation. The sample size was three inches in the machine direction by six inches in the transverse direction. The grip size was three inches in width. The grip separation was four inches. The samples were loaded such that the transverse direction of the sample was in the vertical direction. The preload was of approximately 10-15 grams set. During the test, the film was pulled at 20 inches/min (500 mm/min) to 70 percent elongation (2.8 inches in addition to the 4 inch gap), and then immediately returned to the zero point (the 4 inch gauge separation). The term “percent set” refers to the measure of the amount of the material stretched from its original length after being cycled.
  • Percent set is defined as the point at which the retraction curve crossed the elongation axis.
  • the “load loss” value was calculated as follows: cycle ⁇ ⁇ 1 ⁇ ⁇ extension ⁇ ⁇ tension - cycle ⁇ ⁇ 2 ⁇ ⁇ tension cycle ⁇ ⁇ 1 ⁇ ⁇ extension ⁇ ⁇ tension ⁇ 100 ⁇ % where the extension tension for both cycles is determined at 50% elongation.

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  • Laminated Bodies (AREA)
  • Materials For Medical Uses (AREA)
US11/048,408 2005-02-01 2005-02-01 Transverse-direction, elastomeric, breathable film Abandoned US20060172137A1 (en)

Priority Applications (9)

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US11/048,408 US20060172137A1 (en) 2005-02-01 2005-02-01 Transverse-direction, elastomeric, breathable film
BRPI0606134-6A BRPI0606134A (pt) 2005-02-01 2006-01-30 filme respirável, elastomérico, de direção transversal
PCT/US2006/003218 WO2006083765A2 (fr) 2005-02-01 2006-01-30 Film imper-respirant, elastomere, a sens travers
CNA2006800036524A CN101175630A (zh) 2005-02-01 2006-01-30 横向的、弹性体的透气膜
CA002596162A CA2596162A1 (fr) 2005-02-01 2006-01-30 Film imper-respirant, elastomere, a sens travers
EP06719872A EP1843896A4 (fr) 2005-02-01 2006-01-30 Film imper-respirant, elastomere, a sens travers
MX2007009103A MX2007009103A (es) 2005-02-01 2006-01-30 Pelicula elastomerica, respirable, de direccion transversal.
JP2007554151A JP2008538194A (ja) 2005-02-01 2006-01-30 横方向エラストマー状通気性フィルム
US11/771,412 US7799418B2 (en) 2005-02-01 2007-06-29 Transverse-direction, elastomeric, breathable film

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US11/048,408 US20060172137A1 (en) 2005-02-01 2005-02-01 Transverse-direction, elastomeric, breathable film

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US11/771,412 Expired - Fee Related US7799418B2 (en) 2005-02-01 2007-06-29 Transverse-direction, elastomeric, breathable film

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US7857515B2 (en) 2007-06-15 2010-12-28 S.C. Johnson Home Storage, Inc. Airtight closure mechanism for a reclosable pouch
US7874731B2 (en) 2007-06-15 2011-01-25 S.C. Johnson Home Storage, Inc. Valve for a recloseable container
US7887238B2 (en) 2007-06-15 2011-02-15 S.C. Johnson Home Storage, Inc. Flow channels for a pouch
US7946766B2 (en) 2007-06-15 2011-05-24 S.C. Johnson & Son, Inc. Offset closure mechanism for a reclosable pouch
US7967509B2 (en) 2007-06-15 2011-06-28 S.C. Johnson & Son, Inc. Pouch with a valve
EP2556955A1 (fr) * 2011-08-09 2013-02-13 Orbita-Film GmbH Barrière à huile de bitume
US20170203554A1 (en) * 2014-07-22 2017-07-20 C.I. Kasei Company, Limited Stretchable film
CN115352161A (zh) * 2022-08-18 2022-11-18 山东森博斯特塑胶科技有限公司 一种带有物理孔的透气膜

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US9358759B2 (en) 2013-12-19 2016-06-07 Kimberly-Clark Worldwide, Inc. Multilayered elastic laminates with enhanced strength and elasticity and methods of making thereof
US10213990B2 (en) 2013-12-31 2019-02-26 Kimberly-Clark Worldwide, Inc. Methods to make stretchable elastic laminates
US9802392B2 (en) 2014-03-31 2017-10-31 Kimberly-Clark Worldwide, Inc. Microtextured multilayered elastic laminates with enhanced strength and elasticity and methods of making thereof
CA3116210A1 (fr) 2018-10-12 2020-04-16 Berry Global, Inc. Film polymere oriente dans la direction de la machine, et procede de fabrication du film polymere oriente dans la direction de la machine
ES2993659A1 (es) * 2023-06-28 2025-01-03 Dow Global Technologies Llc Películas de polietileno con múltiples capas con una capa fina cargada con un mineral y copolímero de etileno
CN117565511A (zh) * 2023-10-20 2024-02-20 浙江佑威新材料股份有限公司 一种超薄大幅宽的耐高温真空袋薄膜及其制备方法

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US20100062189A1 (en) * 2006-11-17 2010-03-11 Takatoshi Yosomiya Optical film, polarizing plate and image display device
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US7857515B2 (en) 2007-06-15 2010-12-28 S.C. Johnson Home Storage, Inc. Airtight closure mechanism for a reclosable pouch
US7874731B2 (en) 2007-06-15 2011-01-25 S.C. Johnson Home Storage, Inc. Valve for a recloseable container
US7887238B2 (en) 2007-06-15 2011-02-15 S.C. Johnson Home Storage, Inc. Flow channels for a pouch
US7946766B2 (en) 2007-06-15 2011-05-24 S.C. Johnson & Son, Inc. Offset closure mechanism for a reclosable pouch
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EP2556955A1 (fr) * 2011-08-09 2013-02-13 Orbita-Film GmbH Barrière à huile de bitume
US20170203554A1 (en) * 2014-07-22 2017-07-20 C.I. Kasei Company, Limited Stretchable film
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CN115352161A (zh) * 2022-08-18 2022-11-18 山东森博斯特塑胶科技有限公司 一种带有物理孔的透气膜

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MX2007009103A (es) 2007-09-12
JP2008538194A (ja) 2008-10-16
CA2596162A1 (fr) 2006-08-10
WO2006083765A3 (fr) 2007-11-22
EP1843896A2 (fr) 2007-10-17
EP1843896A4 (fr) 2010-09-29
WO2006083765A2 (fr) 2006-08-10
CN101175630A (zh) 2008-05-07
BRPI0606134A (pt) 2008-03-04
US7799418B2 (en) 2010-09-21
US20070248835A1 (en) 2007-10-25

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