WO2014100921A1 - Bague d'étanchéité en caoutchouc mousse et ruban adhésif reposant sur des dispersions de polyuréthane - Google Patents

Bague d'étanchéité en caoutchouc mousse et ruban adhésif reposant sur des dispersions de polyuréthane Download PDF

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Publication number
WO2014100921A1
WO2014100921A1 PCT/CN2012/001765 CN2012001765W WO2014100921A1 WO 2014100921 A1 WO2014100921 A1 WO 2014100921A1 CN 2012001765 W CN2012001765 W CN 2012001765W WO 2014100921 A1 WO2014100921 A1 WO 2014100921A1
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WIPO (PCT)
Prior art keywords
kpa
polymer sheet
cps
polyurethane
microns
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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.)
Ceased
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PCT/CN2012/001765
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English (en)
Inventor
Jing Guan
Amigo DONG
Georges Moineau
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Saint Gobain Performance Plastics Corp
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Saint Gobain Performance Plastics Corp
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Priority to PCT/CN2012/001765 priority Critical patent/WO2014100921A1/fr
Publication of WO2014100921A1 publication Critical patent/WO2014100921A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • B32B27/065—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 foam
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/30—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by mixing gases into liquid compositions or plastisols, e.g. frothing with air
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • 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
    • B32B2307/54—Yield strength; Tensile strength
    • 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
    • B32B2307/584—Scratch resistance
    • 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
    • B32B2581/00—Seals; Sealing equipment; Gaskets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/04—Foams characterised by the foaming process characterised by the elimination of a liquid or solid component, e.g. precipitation, leaching out, evaporation
    • C08J2201/05—Elimination by evaporation or heat degradation of a liquid phase
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/04—Foams characterised by their properties characterised by the foam pores
    • C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00—Foams characterised by their properties
    • C08J2205/06—Flexible foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2207/00—Foams characterised by their intended use
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2421/00—Presence of unspecified rubber
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00—Presence of (meth)acrylic polymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • C09J2475/006—Presence of polyurethane in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00—Presence of polysiloxane

Definitions

  • This disclosure in general relates to polyurethane foam products and in particular to gaskets and bonding tapes.
  • Typical electronic devices are housed within a casing formed in several sections that fit together and are secured by screws or by compression fittings.
  • Such casings generally utilize gaskets to at least partially isolate the inside of the casing from the external environment.
  • Foam bonding tapes are ideal for a variety of applications where bonding and joining of components are needed, most prevalent in the electronic, automotive, and transportation industry. Bonding tapes reduce or eliminate the need for mechanical fasteners such as rivets or screws, liquid adhesives, or welds. This leads to shorten production periods, higher productivity, lower costs, and improved product appearance. Bonding tapes have a foam core based on polyurethane (PU), polyolefin, acrylic polymers, and others. Polyurethane foam cores show improved performance with respect to dissipating vibrations and distributing stress. However, conventional PU foam tapes may not meet all demands of the application.
  • PU polyurethane
  • FIG. 1 , FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 6 include illustrations of exemplary foam materials useful in making sealing gaskets
  • FIG. 7 includes an illustration of an exemplary seal gasket.
  • FIG. 8A and FIG. 8B include illustrations of an exemplary seal gasket configuration in an electronic device.
  • FIG. 9 includes an illustration of an exemplary foam material useful in making bonding tapes.
  • FIG. 10 includes an illustration of an exemplary bonding tape as manufactured for commerce.
  • FIG. 1 1 and FIG. 12 include Compression Force Deflection and Force-to- Compress data as measured from samples according to embodiments.
  • a polymer sheet in a first aspect, includes a polyurethane core.
  • the polyurethane core has a first major surface and a second major surface opposite the first major surface.
  • the polymer sheet can have at least one functional layer overlying a major surface.
  • the polymer sheet has a thickness tps.
  • the polyurethane core has a thickness tpc- In embodiments tpc can be at least 0.5 tps.
  • the polyurethane core includes a polyurethane polymer.
  • the polyurethane core can have at least one of the following property:
  • an assembly in a second aspect, includes a first member and a second member and a gasket.
  • the gasket can be compressed between the first member and the second member.
  • the gasket can include a polyurethane core having a first major surface and a second major surface opposite the first major surface. In embodiments, the gasket can be compressed between the first and the second member at a compression of at least about 10%.
  • the polyurethane core can include a polyurethane polymer.
  • the polyurethane core can include one of the above described properties (i) through (iv), namely, a Scratch Resistance Rating of not greater than about 10 wt%, an elongation at break of at least 200 %, a tensile strength at break of at least 0.5 MPa, or a loss of tensile strength of at least 5% when exposed to UV light according to standard ASTM D2565-99.
  • a method of preparing a polymer sheet includes frothing a polyurethane dispersion into a froth.
  • the froth can be casted onto a liner.
  • the casted froth can be treated to have a uniform thickness.
  • the method can further include drying the casted froth to form a polyurethane core.
  • the polyurethane core has a thickness tpF.
  • tpF can be at least 0.5 of the total thickness of the polymer sheet
  • the polyurethane core can include one of the above described properties (i) through (iv), with respect to Scratch Resistance Rating, elongation at break, tensile strength at break, or loss of tensile strength when exposed to UV light according to standard ASTM D2565-99.
  • a gasket 100 includes a polyurethane foam layer 102 having a top surface and a bottom surface.
  • the foam layer 102 can be a polyurethane foam formed from a polyurethane dispersion, a surfactant, a thickener, a pigment, and an optional solvent, an optional chain extender or crosslinking agent.
  • polyurethane dispersions within the meaning of the present invention, the following dispersion can be used, optionally in combination: a) Anionic aliphatic polyester polyurethane dispersions
  • Impranil ® LP RSC 1380 DL 1537 XP, DL 1554 XP.
  • Impranil ® DLU Dispersion the following polyurethane dispersion sold by the Bayer MaterialScience AG can be used: Impranil ® DLU Dispersion. d) Anionic polycarbonate polyurethane dispersions
  • surfactant which also act as foam stabilizer
  • the following compounds can be used: Stokal ® STA, Stokal ® SR As thickener, Borchigel ALA can be used.
  • pigment SP-9695 from
  • IPA isopropyl alcohol
  • optional cross-linker or chain extender Cymel ® 325 or Imprafix ® 2794 XP can be used.
  • other cross-linkers can be used as well.
  • optional cross-linker can be melamine-based cross-linkers, an isocyanate-based cross-linker, or a polyaziridine based cross-linker.
  • the melamine-based cross-linker is melamine.
  • the above surfactant can be modified or replaced with another surfactant.
  • the additional or replacing surfactant can be selected from ether sulfates, fatty alcohol sulfates, sarcosinates, organic amine oxides, sulfonates, betaines, organic acid amides, sulfosuccinates, sulfonic acids, alkanolamides, ethoxylated fatty alcohols, sorbinates, or any combination thereof
  • a release liner 1044 overlies the foam core 102 over a major surface.
  • only one release liner 1042 covers a first major surface of the foam core 102, while the second major surface remains uncovered.
  • two release liners, 1042 and 1044 overlie the two major surfaces of the foam core 102.
  • the foam core and the at least one release liner form a polymer sheet.
  • the polymer sheet has a primary aspect ratio, defined as the ratio of the largest dimension of the polymer sheet, i.e., length, over the second largest dimension, i.e., width of the polymer sheet.
  • the a primary aspect ratio of the polymer sheet can be at least about 100, such as at least about 200, at least about 400, at least about 800, at least about 1000, or at least about 1500.
  • the foam core 102 can have a thickness of at least about 0.2 mm, such as at least about 0.4 mm, at least about 0.6 mm, at least about 0.8 mm, at least about 1.0 mm, at least about 1.2 mm, at least about 1.4 mm, at least about 1.6 mm, at least about 1.8 mm, at least about 2.0 mm, or at least about 2.2 mm.
  • the polyurethane foam core can have a thickness of not greater than about 3.0 mm, such as not greater than about 2.8 mm, not greater than about 2.6 mm, not greater than about 2.4 mm, not greater than about 2.2 mm, not greater than about 2.0 mm, not greater than about 1.8 mm, or not greater than about 1.6 mm.
  • the polyurethane core 102 can have a density as measured according to ASTM D3574 of at least 50 kg/m 3 , such as at least about 60 kg/m 3 , at least about 70 kg/m 3 , at least about 80 kg/m 3 , at least about 90 kg/m 3 , at least about 100 kg/m 3 , at least about 120 kg/m 3 , at least about 140 kg/m 3 , at least about 160 kg/m 3 , at least about 180 kg/m 3 , or at least about 200 kg/m 3 .
  • the polyurethane core can have a density of of not greater than about 350 kg/m , such as not greater than about 330 kg/m , not greater than about 310 kg/m , not greater than about 290 kg/m , not greater than about 270 kg/m , not greater than about 250 kg/m , not greater than about 230 kg/m , not greater than about 210 kg/m , not greater than about 190 kg/m , not greater than about 170 kg/m , not greater than about 150 kg/m , not greater than about 130 kg/m , or not greater than about 1 10 kg/m .
  • the polyurethane foam core comprises cells.
  • the cells can be closed, semi-open, or open. At least 50% of the cells can have a cell diameter of at least about 30 microns, such as at least about 40 microns, at least about 50 microns, at least about 60 microns, at least about 70 microns, at least about 80 microns, at least about 90 microns, at least about 100 microns, at least about 120 microns, and not greater than about 160 microns.
  • At least 50% of the cells can have a cell diameter of , not greater than about 160 microns, not greater than about 140 microns, not greater than about 120 microns, not greater than about 100 microns, not greater than about 90 microns, not greater than about 80 microns, not greater than about 70 microns, or not greater than about 60 microns.
  • the polyurethane core can further include a flame retardant or a filler.
  • the filler can be selected from bentonite, kaolin, powdered glass, glass beads, glass fibers, calcium carbonate, quartz sand, fluoropolymer, thermoplastic, microspheres, or any combination thereof.
  • a polyurethane dispersion in mixture with a surfactant, a pigment, an optional solvent, an optional cross-linker, and an optional filler can be frothed mechanically.
  • a blowing agent such as a blowing agent can be used.
  • the mixture can be frothed in the presence of a gas, such as air, nitrogen, or a noble gas including, for example, helium, neon, or argon.
  • Blowing agents can be used, alone or as mixtures with each other. Blowing agents can be selected from a broad range of materials, including hydrocarbons, halohydrocarbons, ethers, esters and partially halogenated hydrocarbons, ethers and esters, or the like. Typical physical blowing agents have a boiling point between minus 50°C and positive 100°C, and preferably between about -50°C and 50°C.
  • Exemplary physical blowing agents include the CFC's (chlorofluorocarbons) such as 1 , 1 -dichloro- 1 -fluoroethane, 1 , 1 -dichloro-2,2,2-trifluoro-ethane,
  • fluorocarbons such as 1 ,1 ,1,3,3,3-hexafluoropropane, 2,2,4,4-tetrafluorobutane, 1 ,1 ,1 ,3 ,3 ,3-hexafluoro-2-methylpropane, 1 ,1 ,1 ,3 ,3 -pentafluoropropane, 1 ,1 ,1 ,2,2- pentafluoropropane, 1 ,1 , 1,2,3 -pentafluoropropane, 1 , 1 ,2,3 ,3 -pentafluoropropane, 1 , 1 ,2,2,3 -pentafluoropropane, 1,1 ,1 ,3 ,3,4-hexafluorobutane, 1,1 ,1 ,3,3- pentafluorobutane, 1 ,1 ,1,4,4,4-hexafluorobutane, 1 ,
  • the foam layer 102 has a top surface and a bottom surface that are characterized by a skin.
  • the skin for example, is substantially free of pores.
  • the skin associated with the top surface and the bottom surface can be substantially continuous including few, if any, breaks or openings. In fact, the skin can be hard enough to exhibit scratch resistance.
  • Scratch resistance can be determined with a Taber ® Abraser. Scratch resistance was quantified by determining a Scratch Resistance Rating. The Scratch Resistance Rating is the loss in weight percentage of the mass of a sample having a diameter of 100 mm after exposure to 500 cycles on a Taber 5135 Rotary Abraser using Calibrade H-18 wheels at a speed of 60 cycles per minute. Accordingly, the fraction of [Mass (before test)-Mass (after test)]/Mass (before test) in percent provides the Scratch Resistance Rating.
  • the Scratch Resistance Rating is not greater than 10 wt%, such as not greater than about 8 wt%, not greater than about 6 wt%, not greater than about 5 wt%, not greater than about 4 wt%, or not greater than about 2 wt%.
  • the release liner, 1042 or 1044 can include paper, a polymer film, or any combination thereof.
  • An exemplary paper includes a coated paper.
  • An exemplary polymer film is formed of polyolefin, polyester, polyamide, polyvinyl chloride, fluoropolymer, polyimide, or any combination thereof.
  • An exemplary polyolefin includes polyethylene, polypropylene, or any combination thereof.
  • An exemplary polyester includes poly(ethylene terephthalate) (PET).
  • PET poly(ethylene terephthalate)
  • the polymer film is formed of a liquid crystal polymer, such as an aromatic polyester or a polyesteramide.
  • the release liner, 1042 or 1042 can have a thickness in a range of 0.01 mm to 0.1 mm.
  • the liner can have a thickness in a range of 25 microns to 180 microns, such as a range of 25 microns to 150 microns, or even a range of 25 microns to 100 microns.
  • the release liner can have a thickness of at least about 0.01 mm, such as at least about 0.015 mm, at least about 0.02 mm, at least about 0.025 mm, at least about 0.03 mm, at least about 0.035 mm, or at least about 0.04 mm.
  • the release liner can have a thickness of not greater than about 0.1 mm, such as not greater than about 0.09 mm, not greater than about 0.08 mm, not greater than about 0.075 mm, not greater than about 0.07 mm, not greater than about 0.065 mm, not greater than about 0.06 mm, not greater than about 0.055 mm, or not greater than about 0.05 mm.
  • the release liner can have a base weight in a range of 10 g/m 2 to 400 g/m 2 , such as a range of 30 g/m 2 to
  • the surfaces of the foam layer in contact with the release liner exhibits a desirable range of adhesion to a release liner (PET film) as determined by the method described in the Examples.
  • PET film a release liner
  • the surface of the foam layer in contact with the release liner (PET) can exhibit an adhesion of approximately 0.01 N/in or lower.
  • the surface can have an initial adhesion in a range of 0.01 N/in to 0.2 N/in, a range of 0.015 N/in to 0.2 N/in, or even a range of 0.02 N/in to 0.2 N/in.
  • a surface of the foam layer can exhibit a desirable tack. Tack is measured in
  • the tack can be at least 0.1 N, such as at least 0.2 N, for example, in a range of 0.2 N to 1.2 N, such as a range of 0.3 N to 1.2 N or 0.3 N to 1.0 N.
  • FIG. 2 illustrates another embodiment of the polymer sheet.
  • a topcoat 206 can overlie the first major surface of the foam core 102.
  • the topcoat can include an acrylic coating, a polyurethane coating, or a combination thereof.
  • the topcoat includes a silicone modified polyurethane coating.
  • the topcoat can have thickness of at least about 0.001 mm, such as at least about 0.002 mm, at least about 0.003 mm, or at least about 0.004 mm.
  • the topcoat can have thickness of not greater than about 0.01 mm, such as not greater than about 0.009 mm, not greater than about 0.008 mm, not greater than about 0.007 mm, not greater than about 0.006 mm, or not greater than about
  • a permanent liner 204 can be disposed over the second major surface.
  • the permanent liner 204 can include a thermoplastic.
  • the thermoplastic is selected from polyethylene, polyester, polyimide, or any combination thereof.
  • the polyethylene includes ultra-high molecular weight polyethylene.
  • the permanent liner can have a thickness of at least about 0.01 mm, such as at least about 0.015 mm, at least about 0.02 mm, at least about 0.025 mm, at least about 0.03 mm, at least about 0.035 mm, or at least about 0.04 mm.
  • the permanent liner can have a thickness of not greater than about 0.1 mm, such as not greater than about 0.09 mm, not greater than about 0.08 mm, not greater than about 0.075 mm, not greater than about 0.07 mm, not greater than about 0.065 mm, not greater than about 0.06 mm, not greater than about 0.055 mm, or not greater than about 0.05 mm.
  • FIG. 3 depicts a further development from the polymer sheet 200 of FIG. 2.
  • an adhesive layer 308 is disposed over the permanent liner 204.
  • the adhesive layer can be an acrylic adhesive, a pressure sensitive adhesive, a silicon adhesive, of a rubber hot melt adhesive. Similar to the permanent liner, the adhesive layer 308 can have a thickness of at least about 0.01 mm, such as at least about 0.015 mm, at least about 0.02 mm, at least about 0.025 mm, at least about 0.03 mm, at least about 0.035 mm, or at least about 0.04 mm.
  • the adhesive layer can have a thickness of not greater than about 0.1 mm, such as not greater than about 0.09 mm, not greater than about 0.08 mm, not greater than about 0.075 mm, not greater than about 0.07 mm, not greater than about 0.065 mm, not greater than about 0.06 mm, not greater than about 0.055 mm, or not greater than about 0.05 mm.
  • the polymer sheet can include subcombinations of the elements shown in FIGs. 1 -3.
  • two liners, one being a release liner and one being a permanent liner can be disposed over the first and second major surface, respectively.
  • two permanent liners can overlie both major surfaces. Accordingly, for an assembly having two permanent liners, one or both liner can be overlaid with an adhesive.
  • FIGs. 4-6 are analogous to FIGs. 1-3 with the difference that the foam core has a film 406 embedded. Accordingly, a film 406 has two major surfaces, on both of which a polyurethane foam core 402 is disposed. The stack of film 406 and
  • polyurethane foam layers 402 (402/406/402) form now the core of the polymer sheet.
  • the core stack 402/406/402 in FIG. 4 can be overlaid with release liners 4042 and 4044.
  • the core stack 402/406/402 in FIG. 5 can be covered by a topcoat 510 (analogous to topcoat 206) and a permanent liner 508 (analogous to permanent liner 204).
  • the polymer sheet 500 of can further include an adhesive layer (analogous to layer 308) to form polymer sheet 600.
  • the film 406 functions to stabilize the core during when torsion and shear forces are affecting the polymer sheet.
  • the film 406 can include a thermoplastic.
  • the thermoplastic can be selected from polyethylene, polyester, polyimide, or any combination thereof.
  • the polyethylene includes ultra-high molecular weight polyethylene.
  • the film 406 can have a thickness of at least about 0.01 mm, such as at least about 0.015 mm, at least about 0.02 mm, at least about 0.025 mm, at least about 0.03 mm, at least about 0.035 mm, or at least about 0.04 mm.
  • the adhesive layer can have a thickness of not greater than about 0.1 mm, such as not greater than about 0.09 mm, not greater than about 0.08 mm, not greater than about 0.075 mm, not greater than about 0.07 mm, not greater than about 0.065 mm, not greater than about 0.06 mm, not greater than about 0.055 mm, or not greater than about 0.05 mm.
  • the thickness of stack 402/406/402 can be identical to the thickness of the foam core 102 as described above.
  • the foam layer is formed of a polyurethane foam having a structural feature where the foam core forms the major component of the polymer sheet as shown in the cross-sectional thickness ratio, where tpc (thickness of the polyurethane core) is at least 0.5 tps (thickness of polymer sheet), such as at least 0.55 tps, at least 0.6 t s, at least 0.65 tps, at least 0.7 tps, at least 0.75 tps, at least 0.8 t s, at least 0.82 t PS , at least 0.84 t PS , at least 0.86 t PS , at least 0.88 t PS , at least 0.9 t PS , or at least 0.92 tps.
  • tpc thickness of the polyurethane core
  • tps thickness of polymer sheet
  • the polymer sheet is formed in to a roll.
  • the roll can have a diameter of at least about 0.5 m, such as at least about 0.8 m, at least about 0.9 m, at least about 1.0 m, at least about 1.1 m, at least about 1.2 m, or at least about 1.3 m.
  • the roll has a diameter of not greater than about 2.0 m, such as not greater than about 1.9 m, not greater than about 1.8 m, not greater than about 1.7 m, not greater than about 1.6 m, or not greater than about 1.5 m.
  • the foam layer is formed of a polyurethane foam having inherent properties such as Scratch Resistance Rating (as described herein), Elongation at Break, Tensile Strength at Break, and Loss of Tensile Strength after UV Exposure.
  • the elongation at break of the polyurethane foam can be at least about 300 %, such as at least about 400 %, at least about 500 %, at least about 600 %, at least about 700 %, at least about 800 %, at least about 900 %, at least about 1000 %, at least about 1200 %, at least about 1400 %, at least about 1600 %, or at least about 1800 %.
  • the Tensile Strength at Break can be at least about 0.5 MPa, such as at least about 0.7 MPa, at least about 1 MPa, at least about 1.5 MPa, at least about 2 MPa, at least about 2.5 MPa, at least about 3 MPa, at least about 3.5 MPa, at least about 4 MPa, at least about 4.5 MPa, at least about 5 MPa, at least about 5.5 MPa, or at least about 6 MPa.
  • the Loss of Tensile Strength when exposed to UV light according to standard ASTM D2565-99 is at least about 5 %, such as at least about 8 %, at least about 10 %, at least about 12 %, at least about 14 %, at least about 16 %, at least about 18 %, at least about 20 %, at least about 22 %, at least about 25 %, or at least about 30 %.
  • the foam layer is formed of a polyurethane foam having material properties such as density, a recovery time, force-to-compress (FTC), compression force deflection (CFD), or compression set.
  • material properties such as density, a recovery time, force-to-compress (FTC), compression force deflection (CFD), or compression set.
  • FTC force-to-compress
  • CFD compression force deflection
  • Polyurethane foams particularly those formed as described in the method below, exhibit properties that are particularly suited for use in sealing gaskets.
  • the foam layer has a density of not greater than 350 kg/m as measured in accordance with ASTM D3574.
  • the density can be not not greater than about 330 kg/m , not greater than about 310 kg/m , not greater than about 290 kg/m 3 , not greater than about 270 kg/m 3 , not greater than about 250 kg/m 3 , not greater than about 230 kg/m 3 , not greater than about 210 kg/m 3 , not greater than about
  • the density of the foam layer is in a range of 50 kg/m 3 to 250 kg/m 3 , such as a range of 60 kg/m 3 to 250 kg/m 3 ,a range of 100 kg/m 3 to 250 kg/m 3 , a range of 100 kg/m 3 to 200 kg/m 3 , or even a range of 125 kg/m 3 to 200 kg/m 3 .
  • the recovery time is the time it takes for a foam to exert 1.5 N force following release from compression according to the method defined in the Examples.
  • the foam can exhibit an 80% recovery time parameter in a range of 0.001 seconds to 5 seconds, such as a range of 0.001 seconds to 2 seconds, a range of 0.001 seconds to 1 second, a range of 0.005 seconds to 1 second, 0.005 seconds to 0.1 seconds, or even a range of 0.005 seconds to 0.05 seconds.
  • the foam layer can exhibit a desirable 50% recovery time parameter of not greater than 4 seconds, such as not greater than 3 seconds, not greater than 2 seconds, not greater than 1.5 not greater than 1 second, not greater than 0.1 seconds, not greater than 0.01 seconds, or even not greater than 0.001 seconds.
  • the film layer can exhibit a 20% recovery time parameter of not greater than 0.002 seconds, such as not greater than 0.0015, or not greater than 0.001 seconds.
  • the foam layer exhibits a desirable compression profile.
  • the foam layer can exhibit a desirable instant force-to-compress (FTC) at 25% compression as measured according to ASTM D3574 Test C can be at least about 7 kPa, such as at least about 9 kPa, at least about 1 1 kPa, at least about 13 kPa, at least about 15 kPa, at least about 17 kPa, at least about 19 kPa, at least about 21 kPa, at least about 23 kPa, at least about 25 kPa, at least about 27 kPa, at least about 29 kPa, at least about 31 kPa, at least about 33 kPa, at least about 35 kPa, at least about 37 kPa, at least about 39 kPa, at least about 41 kPa, at least about 43 kPa, or at least about 45 kPa.
  • FTC instant force-to-compress
  • the force-to-compress at 25% compression as measured according to ASTM D3574 Test C can be not greater than about 50 kPa, such as not greater than about 48 kPa, not greater than about 46 kPa, not greater than about 44 kPa, not greater than about 42 kPa, not greater than about 40 kPa, not greater than about 38 kPa, not greater than about 36 kPa, not greater than about 34 kPa, not greater than about 32 kPa, not greater than about 30 kPa, not greater than about 28 kPa, not greater than about 26 kPa, not greater than about 24 kPa, not greater than about 22 kPa, not greater than about 20 kPa, not greater than about 18 kPa, not greater than about 16 kPa, not greater than about 14 kPa, or not greater than about 12 kPa.
  • the foam layer can exhibit a compression force deflection (CFD), as measured in accordance with ASTM D3574 Test C at 25% compression of at least about 5 kPa, such as at least about 7 kPa, at least about 9 kPa, at least about 1 1 kPa, at least about 13 kPa, at least about 15 kPa, at least about 17 kPa, at least about 19 kPa, at least about 21 kPa, at least about 23 kPa, at least about 25 kPa, at least about 27 kPa, or at least about 29 kPa.
  • CFD compression force deflection
  • the foam layer can exhibit a compression force deflection (CFD), as measured in accordance with ASTM D3574 Test C at 25% compression of not greater than about 35 kPa, such as not greater than about 34 kPa, not greater than about 32 kPa, not greater than about 30 kPa, not greater than about 28 kPa, not greater than about 26 kPa, not greater than about 24 kPa, not greater than about 22 kPa, not greater than about 20 kPa, not greater than about 18 kPa, not greater than about 16 kPa, not greater than about 14 kPa, not greater than about 12 kPa, or not greater than about 10 kPa.
  • CFD compression force deflection
  • the foam layer can also exhibit a desirable compression set measured in accordance with ASTM D3574 at 70°C for 22 hours and 50% compression of not greater than 15%, such as not greater than 12%, or even not greater than 10%.
  • the foam layer can exhibit a compression set measured in accordance with ASTM D3574 at 23°C for 22 hours at 50% compression of not greater than 10%, such as is not greater than about 8%, such as not greater than about 7%, not greater than about 6%, not greater than about 5%, not greater than about 4%, not greater than about 3%, or not greater than about 2%.
  • the polymer sheet is formed by applying a froth onto a moving carrier for a drying or curing oven.
  • the resulting film is rolled for later storage and can be dispensed and cut into a desirable shape to form a sealing gasket or bonding tape.
  • the froth can be formed from polyurethane dispersions.
  • the polyurethane dispersions can be frothed to include a gas, such as air, nitrogen, or a noble gas including, for example, helium, neon, or argon.
  • the froth can have froth density of at least about 100 g/L, such as at least about 1 10 g/L, at least about 120 g/L, at least about 130 g/L, at least about 140 g/L, at least about 150 g/L, at least about 170 g/L, at least about 190 g/L, at least about 210 g/L, at least about 230 g/L, or at least about 250 g/L.
  • the froth density is not greater than about 1200 g/L, such as not greater than about 1 100 g/L, not greater than about 1000 g/L, not greater than about 900 g/L, not greater than about 800 g/L, not greater than about 700 g/L, not greater than about 600 g/L, not greater than about 500 g/L, not greater than about 400 g/L, or not greater than about 300 g/L.
  • Frothing and also ingredients provide for a certain froth viscosity.
  • the froth can have a viscosity of not greater than about 18000 cps, such as not greater than about 17000 cps, not greater than about 16000 cps, not greater than about 15000 cps, not greater than about 14000 cps, not greater than about 13000 cps, not greater than about 12000 cps, not greater than about 1 1000 cps, not greater than about 10000 cps, not greater than about 9000 cps, not greater than about 8000 cps, not greater than about 7000 cps, not greater than about 6000 cps, or not greater than about 5000 cps.
  • the froth can have a viscosity of at least about 800 cps, such as at least about 900 cps, at least about 1000 cps, at least about 1500 cps, at least about 2000 cps, at least about 2500 cps, at least about 3000 cps, at least about 3500 cps, or at least about 4000 cps.
  • the froth is applied as a foam layer to a carrier, which, for example, moves the foam layer through an oven.
  • the carrier can be a release liner, a permanent liner, or a removable carrier having a non-stick surface.
  • the carrier can be coated with a release agent, such as a silicone release coating, or can include a non-stick material, such as a fluoropolymer, e.g., Teflon®.
  • a film prior to entering the oven, can be applied over the foam layer.
  • the film can constrain the growth of the foam layer to limit the thickness of the foam layer.
  • the film can have a tension applied between rollers, the tension limiting the expansion of the foam layer.
  • the film can be free of tension and can allow the foam layer to expand to its full extent.
  • a blade or knife can spread the mixture to form a uniform thickness in the foam layer before it enters the oven.
  • front rollers associated with the film can act to control the thickness of the mixture entering the oven.
  • the oven can have a temperature in a range of 50°C to 180°C, such as a range of 50°C to 120°C, a range of 70°C to 1 15°C, or even a range of 100°C to 1 15°C.
  • the temperature can be at least about 50 °C, such as at least about 60 °C, at least about 70 °C, at least about 80 °C, at least about 90 °C, at least about 100 °C, at least about 1 10 °C, at least about 120 °C, or at least about 130 °C.
  • the temperature is not greater than about 180 °C, such as not greater than about 170°C, not greater than about 160°C, or not greater than about 150°C.
  • the optional film can be removed and the carrier can be separated from the foam layer.
  • the foam layer can be rolled into a roll.
  • one or more of the film or carrier can remain attached to the foam to form a liner such as a release liner.
  • a liner can be applied over the carrier.
  • the froth can be applied over the liner.
  • a film can be applied over the froth as it enters the oven. After drying or at least partially curing, the liner is separated from the carrier and rolled with the polyurethane foam into a roll.
  • a release coating such as a silicone release coating, can be applied between the carrier and the liner or between the liner and the froth.
  • the film is separated from the polyurethane foam layer.
  • the resulting construction includes a foam layer and liner.
  • the liner can be a permanent liner or a release liner.
  • the froth is dispensed onto a carrier.
  • a film is applied over the froth as it enters the oven. After drying or at least partially curing, the film forms a liner and is rolled with the polyurethane foam into roll.
  • an additional liner can be applied over the carrier.
  • the liner can be incorporated into the film product and rolled into roll.
  • liners can be applied to the foam layer as a release film from the support layer, as the film itself, as a liner released from the film, as the carrier itself, or any combination thereof.
  • the resulting film and optional liner configurations can be dispenses from a roll and cut into shapes to form sealing gaskets.
  • FIG. 7 includes an illustration of an exemplary sealing gasket 700 cut from a polymer sheet.
  • the sheet including a film layer 702, can be cut into desirable shapes including inner contours 704 or outer contours 706.
  • the shape of the sealing gasket can be stamped, die cut, or laser cut from the dispensed film layers.
  • a difference between polymer sheets made from polyurethane dispersions (PUD) and polymer sheets made from polyurethane precursors such as polyols and isocyanates in the final product is the amount of aromatic residues and aromatic polymer groups in the polymeric scaffold.
  • foams made from polyols and isocyanates have a higher content of aromatic residues. Accordingly, as an inherent property the foams from polyurethane precursors, polyols and isocyanates, are less susceptible to UV exposure since the higher aromatic content absorb UV radiation. Conversely, foams from PUD, which have lesser amounts of aromatic residues or aromatic groups in the polymer, would show a loss of mechanical properties, e.g., tensile strength, after extended exposure to UV radiation.
  • foams made from precursors, polyols and isocyanates, and foams made from PUD are by exposing samples to UV radiation and measuring loss of a mechanical property, such as elongation at break or tensile strength at break. Such measurements can be made according to ASTM D2565-99. The sample that shows the greater loss is likely the sample that was made from PUD.
  • PUD foams have a lower content of catalysts.
  • the polyurethane core of the present embodiments include a catalyst in an amount less than for conventional polyurethanes, namely of not greater than about 0.3 wt%, such as not greater than 0.2 wt%, not greater than 0.1 wt%, not greater than 0.05 wt%, not greater than 0.01 wt%, not greater than 0.005 wt%, not greater than 0.001 wt%, not greater than 0.0005 wt%, or not greater than 0.0001 wt%.
  • the polyurethane catalyst can be selected from the group consisting of triethylamine, tributylamine, N- methylmorpholine, N-ethylmorpholine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethylethylenediamine, pentamethyl-diethylenetriamine, 1 ,4-diazabicyclo(2.2.2)octane, N-methyl-N'- dimethylaminoethylpiperazine, bis-(dimethylaminoalkyl)piperazines, N,N- dimethylbenzylamine, N,N-dimethylcyclohexylamine, ⁇ , ⁇ -diethylbenzylamine, bis- ( ⁇ , ⁇ -diethylaminoethyl) adipate, N,N,N',N'-tetramethyl-l ,3-butanediamine, N,N- dimethyl-p-phenylethylamine, 1,2-dimethylimidazole, 2-methylimi
  • FIG. 8A depicts the cross-sectional view and components of an electronic device 800, such as tablet computer, having an upper bezel 802, an intermediate frame 804, and LCD display 810, a backlight frame 806 including backlight tubes 814 and diffuser film 812.
  • an electronic device 800 such as tablet computer
  • FIG. 8B depicts an enlarged view of a section of the disassembled device to further disclose the location for outer gasket 816 located between the cover sheet 8102 of the LCD screen 8104 and upper bezel 802.
  • Inner gasket 818 is located between intermediate frame 804 and LCD screen 8104. The position of the two gaskets display the diversity polyurethane gaskets are exposed to.
  • Gasket 806 has sealing function to separate external factors (dust and moisture) from the internal components, while inner gasket 804 has a spacing and a cushioning function, both of which need to be constant as the device heats and cools during periods of use. This example demonstrates the broad spectrum of demand that gaskets (and bonding tapes) have to satisfy.
  • the gaskets are compressed between first and second members of an electronic device, such as a circuit, a display part, an electronic screen, an electronic screen cover, a frame, a housing part, or any combination thereof.
  • At least one of the components can be an electronic screen, the electronic screen including diodes, such as LEDs or LCDs.
  • the gaskets can be compressed to at least 10%, such as at least about 20%, at least about 25%, at least about 30%, at least about 35%, at least about 40%, at least about 45%, at least about 50%, at least about 55%, at least about 60%, at least about 65%, at least about 70%, or at least about 75%.
  • the compression is not greater than about 90%, such as not greater than about 85%, not greater than about 80%, not greater than about 75%, not greater than about 70%, not greater than about 65%, not greater than about 60%, not greater than about 55%, not greater than about 50%, not greater than about 45%, or not greater than about 45%.
  • FIG. 9 depicts a cross-sectional view of a bonding tape 900 having a foam core 902, which can be identical to foam core 102 of FIGs. 1-3 or foam core stack 402/406/402 of FIGs. 4-6.
  • the foam core is covered on both major surfaces with an adhesive layer 904, which is in structure and quality identical to adhesive layer 308 (FIG.3) and 612 (FIG. 6).
  • the adhesive layer 904 can be covered with one or two release liners 906 to ensure that the adhesive properties remain intact until
  • FIG. 10 depicts another example of the bonding tape 900 in a rolled
  • the tape has only one release liner 906.
  • the single release liner 906 serves as a protection layer for both adhesive layers 904 since the bonding tape is formed into a roll 1000.
  • CFD Compression force deflection
  • Force-To-Compress were measured in accordance with ASTM D3574 Test C at compression of 10%, 20%, 30%, . . ., 90%. Results are depicted in FIGs. 1 1 and 12.
  • Samples of Examples 1-3 were prepared using the ingredients and amounts as shown in Table 1. The various froth samples were mechanically agitated to a froth density of 271 g/L and spread at Wet Gap of 1.25 mm. Table 1 shows that the samples differ in Froth densities. The samples were dried in a oven at temperatures in a range of 1 10°C to 120°C.
  • the recovery time is the time a foam takes to exert a force of 1.5 N after release from 10 seconds of compression.
  • the recovery time is determined in accordance with the method defined below and is expressed in terms of the percent compression prior to release.
  • the 20% recovery time is the time a foam takes to exert the desired force following 20% compression.
  • the method for determining the recovery time is a) compress a foam layer to a set percent compression (e.g., 20%, 50% or 80%) based on the foam's original thickness at a rate of 0.16 mm/sec using a flat probe having a surface area of 491 mm 2 , b) hold compression for 10 seconds, c) move the probe to a position corresponding to 85%) of the original thickness, d) measure the force exerted by the foam for a set percent compression (e.g., 20%, 50% or 80%) based on the foam's original thickness at a rate of 0.16 mm/sec using a flat probe having a surface area of 491 mm 2 , b) hold compression for 10 seconds, c) move the probe to a position corresponding to 85%) of the original thickness, d) measure the force exerted by the foam for
  • the recovery time is the amount of time the foam takes to exert 1.5 N on the probe when positioned at 85% of the original thickness.
  • Example 4-8 Samples of Examples 4-8 were prepared using the ingredients and amounts as shown in Table 2. The various froth samples were prepared as described above for the compression examples. Afterwards samples of Examples 4-8 were subjected to the 50% recovery time test and the results are shown in Table 2.
  • Tables 3A-3C show the results for formulations with variation of the polyurethane dispersions
  • Table 3B shows the results with variation in the amounts of crosslinker Cymel 325
  • Table 3C shows the results with variation in the amounts of surfactant Stokal ® SR.
  • Scratch resistance was determined with a Taber Abraser. Scratch resistance was quantified by determining a Scratch Resistance Rating. The Scratch Resistance Rating is the loss in weight percentage of the mass of a sample having a diameter of 100 mm after exposure to 500 cycles on a Taber 5135 Rotary Abraser using Calibrade H-18 wheels at a speed of 60 cycles per minute. Accordingly, the fraction of:
  • Comparison Samples were also prepared from 10 gasketing foam, available from Saint-Gobain Performance Plastic Inc.
  • Comparison Example A is a disc of KIO having a thickness of 1.0 mm.
  • Comparison Example B is a disc made from a foam obtained from Rogers Foam Corp., product number 4790-92-090-030. Table 4 depicts the measured weight losses.
  • a process, method, article, or apparatus that comprises a list of features is not necessarily limited only to those features but may include other features not expressly listed or inherent to such process, method, article, or apparatus.
  • "or" refers to an inclusive-or and not to an exclusive-or. For example, a condition A or B is satisfied by any one of the following: A is true (or present) and B is false (or not present), A is false (or not present) and B is true (or present), and both A and B are true (or present).

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une feuille de polymère qui comprend une âme en polyuréthane. L'âme en polyuréthane comporte une première surface principale et une seconde surface principale opposée à la première surface principale. La feuille de polymère peut comporter au moins une couche fonctionnelle superposée à une surface principale. La feuille de polymère a une épaisseur tPS. L'âme en polyuréthane a une épaisseur tPC. Dans certains modes de réalisation tPC peut être supérieur ou égal à 0,5 × tPS. L'âme en polyuréthane peut avoir au moins une des propriétés suivantes : (i) un classement de résistance aux éraflures, tel que décrit ci-après dans le présent brevet, inférieur ou égal à environ 10% en poids, (ii) un allongement au moment de la rupture d'au moins 200%, (iii) une résistance à la traction au moment de la rupture d'au moins 0,5 MPa, (iv) une perte de résistance à la traction d'au moins 5% quand on l'expose à la lumière UV selon la norme ASTM D2565-99. La feuille de polymère peut être utilisée pour des joints statiques ou des rubans adhésifs.
PCT/CN2012/001765 2012-12-31 2012-12-31 Bague d'étanchéité en caoutchouc mousse et ruban adhésif reposant sur des dispersions de polyuréthane Ceased WO2014100921A1 (fr)

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EP3626222A1 (fr) * 2018-09-18 2020-03-25 Progetti S.r.l. Coussinet pour administrer un massage cardiaque
US10975268B2 (en) 2015-02-10 2021-04-13 Hydrophon Kunststofftechnik Gmbh Sealing sheet and adhesive tape for wet rooms
US11591497B2 (en) 2017-12-14 2023-02-28 Avery Dennison Corporation Pressure sensitive adhesive with broad damping temperature range
CN118076480A (zh) * 2021-10-27 2024-05-24 罗杰斯公司 阻燃多层材料、其制造方法和用途

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CN1386091A (zh) * 2000-07-26 2002-12-18 世界财产股份有限公司 可压缩的泡沫材料带及其制造方法
US20040157035A1 (en) * 2003-02-10 2004-08-12 Guizzetti Allen R. Low permeation gaskets
CN101850639A (zh) * 2009-03-24 2010-10-06 井上株式会社 聚氨酯泡沫层压体及其制造方法以及垫圈
US20110020549A1 (en) * 2009-07-24 2011-01-27 Saint-Gobain Performance Plastics Chaineux Polyurethane gaskets and process for forming same
WO2012006543A2 (fr) * 2010-07-09 2012-01-12 Saint-Gobain Performance Plastics Corporation Joint d'étanchéité en mousse

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CN1386091A (zh) * 2000-07-26 2002-12-18 世界财产股份有限公司 可压缩的泡沫材料带及其制造方法
US20040157035A1 (en) * 2003-02-10 2004-08-12 Guizzetti Allen R. Low permeation gaskets
CN101850639A (zh) * 2009-03-24 2010-10-06 井上株式会社 聚氨酯泡沫层压体及其制造方法以及垫圈
US20110020549A1 (en) * 2009-07-24 2011-01-27 Saint-Gobain Performance Plastics Chaineux Polyurethane gaskets and process for forming same
WO2012006543A2 (fr) * 2010-07-09 2012-01-12 Saint-Gobain Performance Plastics Corporation Joint d'étanchéité en mousse

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10975268B2 (en) 2015-02-10 2021-04-13 Hydrophon Kunststofftechnik Gmbh Sealing sheet and adhesive tape for wet rooms
US11591497B2 (en) 2017-12-14 2023-02-28 Avery Dennison Corporation Pressure sensitive adhesive with broad damping temperature range
EP3626222A1 (fr) * 2018-09-18 2020-03-25 Progetti S.r.l. Coussinet pour administrer un massage cardiaque
CN118076480A (zh) * 2021-10-27 2024-05-24 罗杰斯公司 阻燃多层材料、其制造方法和用途

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