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US20030118852A1 - Single ply reinforced roofing membrane - Google Patents

Single ply reinforced roofing membrane Download PDF

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Publication number
US20030118852A1
US20030118852A1 US10/359,424 US35942403A US2003118852A1 US 20030118852 A1 US20030118852 A1 US 20030118852A1 US 35942403 A US35942403 A US 35942403A US 2003118852 A1 US2003118852 A1 US 2003118852A1
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US
United States
Prior art keywords
polyolefin
single ply
roofing membrane
ply reinforced
ethylene
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
US10/359,424
Inventor
Krishna Venkataswamy
Krishna Srinivasan
Li-Ying Yang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Building Materials Investment Corp
Original Assignee
Building Materials Investment Corp
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 Building Materials Investment Corp filed Critical Building Materials Investment Corp
Priority to US10/359,424 priority Critical patent/US20030118852A1/en
Publication of US20030118852A1 publication Critical patent/US20030118852A1/en
Priority to US10/627,847 priority patent/US20040157075A1/en
Assigned to CITIBANK, N.A. reassignment CITIBANK, N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BMCA INSULATION PRODUCTS INC., BUILDING MATERIALS CORPORATION OF AMERICA, BUILDING MATERIALS INVESTMENT CORPORATION, BUILDING MATERIALS MANUFACTURING CORPORATION, DUCTWORK MANUFACTURING CORPORATION, GAF LEATHERBACK CORP., GAF MATERIALS CORPORATION (CANADA), GAF PREMIUM PRODUCTS INC., GAF REAL PROPERTIES, INC., GAFTECH CORPORATION, LL BUILDING PRODUCTS INC., PEQUANNOCK VALLEY CLAIM SERVICE COMPANY, INC., SOUTH PONCA REALTY CORP., WIND GAP REAL PROPERTY ACQUISITION CORP.
Assigned to BUILDING MATERIALS CORPORATION OF AMERICA, GAFTECH CORPORATION, SOUTH PONCA REALTY CORP., GAF REAL PROPERTIES, INC., BUILDING MATERIALS INVESTMENT CORPORATION, PEQUANNOCK VALLEY CLAIM SERVICE COMPANY, INC., GAF MATERIALS CORPORATION (CANADA), GAF LEATHERBACK CORP., GAF PREMIUM PRODUCTS, INC., DUCTWORK MANUFACTURING CORPORATION, BMCA INSULATION PRODUCTS, INC., LL BUILDING PRODUCTS, INC., BUILDING MATERIALS MANUFACTURING CORPORATION, WIND GAP REAL PROPERTY ACQUISITION CORP. reassignment BUILDING MATERIALS CORPORATION OF AMERICA RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITIBANK, N.A.
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D5/00—Roof covering by making use of flexible material, e.g. supplied in roll form
    • E04D5/10—Roof covering by making use of flexible material, e.g. supplied in roll form by making use of compounded or laminated materials, e.g. metal foils or plastic films coated with bitumen
    • 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
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/16—Ethene-propene or ethene-propene-diene copolymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
    • C08L23/0869—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen
    • C08L23/0892—Copolymers of ethene with unsaturated hydrocarbons containing atoms other than carbon or hydrogen with monomers containing atoms other than carbon, hydrogen or oxygen
    • 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
    • Y10T428/19—Sheets or webs edge spliced or joined
    • Y10T428/192—Sheets or webs coplanar
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • 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
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/24994—Fiber embedded in or on the surface of a polymeric matrix
    • 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
    • Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
    • Y10T428/24994—Fiber embedded in or on the surface of a polymeric matrix
    • Y10T428/24995—Two or more 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
    • 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]
    • Y10T428/31855—Of 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • 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
    • 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]
    • Y10T428/31855—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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/164—Including a preformed film, foil, or sheet
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/164—Including a preformed film, foil, or sheet
    • Y10T442/169—Polyolefin film or sheet
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/172—Coated or impregnated
    • 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
    • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/10—Scrim [e.g., open net or mesh, gauze, loose or open weave or knit, etc.]
    • Y10T442/102—Woven scrim
    • Y10T442/172—Coated or impregnated
    • Y10T442/176—Three or more layers

Definitions

  • This invention relates to single ply reinforced roofing membranes for covering industrial and commercial flat roofs, and, more particularly, to such membranes having significantly improved tensile and seam strength properties.
  • Heat-sealable, reinforced polyolefin-based single ply roofing membranes are composed of-base (bottom) and cap (top) polyolefin-based sheets (layers) with a fiber reinforcement scrim (middle) sandwiched between the other two layers.
  • the scrim is the strongest layer in the composite.
  • the roofing membrane is observed to have only low tensile and seam strength properties.
  • a small amount of a highly-flowable, functional-polyolefin is incorporated into one or both polyolefin-based roofing sheets of a single ply roofing membrane to modify the surface-polarity of the polyolefin sheets therein.
  • the resulting composite membrane of the invention exhibits substantially improved adhesion between the reinforcement scrim and the polyolefin sheets. As a result, the tensile and seam strengths of the membrane is advantageously increased
  • a single ply reinforced roofing membrane having significantly improved tensile and seam strengths.
  • the membrane comprises a reinforcement scrim sandwiched between polyolefin cap and base layers, and is particularly characterized in that at least one of these layers includes a functional-polyolefin as additive therein.
  • the thickness of the membrane preferably ranges from 5 to 200 mils, more preferably from 35-90 mils.
  • the single ply reinforced roofing membrane of the invention includes about 0.5-20% by wt. of the functional-polyolefin additive in one of said layers, preferably about 1-10%, and most preferably about 1-5%.
  • the functional polyolefin additive is suitably selected from polyolelfins which have been modified with one or more functional groups, such as carboxyl, epoxy, anhydride, amine, ester, (meth)acrylate and succinimide groups.
  • Suitable polyolefins are polymers such as polyethylene, polypropylene, terpolymers of ethylene, propylene and diene monomers, ethylene-propylene copolymers, ethylene-butene copolymers, ethylene-hexene copolymers, ethylene-octene copolymers, propylene-C 4-8 alpha-olefin copolymers, metallocene polyolefins and the like.
  • a preferred functional polyolefin for use herein is maleic anhydride-modified polypropylene sold by CK Witco.
  • Cap (top) and base (bottom) sheets (layers) of a standard single ply reinforcement polyolefin roofing membrane was made of 100 parts of polyolefin resins, including conventional ingredients, such as 0-80 parts of fire retardant, 0-20 parts of processing oil, ingredients zinc oxide, UV and thermal stabilizers, carbon black, titanium dioxide and calcium carbonate, as is well known in the art.
  • the ingredients were mixed in an extruder at 200° C. and sheeted to a thickness of about 20-30 mils.
  • a reinforcement scrim then was inserted between the top and bottom sheets, and the three layers were pressed into a 45 mil reinforced single ply membrane.
  • the standard membrane then was tested for tensile strength and seam strength.
  • the top sheet of the polyolefin roof membrane was made of the same ingredients as described in the Standard Example. In this example, however, the bottom polyolefin sheet, was admixed with 3 parts by weight of maleic anhydride-polypropylene (CK Witco) before pressing. Then, as usual, the compositions were mixed in an extruder at 200° C. and sheeted to thicknesses of about 20-30 mils. Then a reinforcement scrim was inserted between the top and bottom sheets and the three layers were pressed into a 45 mil single ply reinforced membrane. The resulting membrane was tested for tensile strength and seam strength.
  • CK Witco maleic anhydride-polypropylene
  • Example 1 was repeated except that 2.5 parts by weight of maleic anhydride-polypropylene additive was included in the top sheet of the membrane.
  • Example 1 was repeated except that 1 part of the additive was provided in the bottom layer.
  • Example 1 was repeated except that 5 parts by weight of the additive was present in the bottom layer.

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

Abstract

A single ply reinforced roofing membrane having advantageous tensile and seam strength comprising a reinforcement scrim sandwiched between polyolefin cap and base layers, characterized in that at least one of said layers includes a functional polyolefin as additive therein.

Description

    BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0001]
  • This invention relates to single ply reinforced roofing membranes for covering industrial and commercial flat roofs, and, more particularly, to such membranes having significantly improved tensile and seam strength properties. [0002]
  • 2. Description of the Prior Art [0003]
  • Heat-sealable, reinforced polyolefin-based single ply roofing membranes are composed of-base (bottom) and cap (top) polyolefin-based sheets (layers) with a fiber reinforcement scrim (middle) sandwiched between the other two layers. The scrim is the strongest layer in the composite. In order to fully realize the reinforcement properties of the scrim in such a laminate composite, however, it is necessary that excellent adhesion exist between the polyolefin sheets and the scrim. Unfortunately, due to the inherent incompatibility of scrim materials and polyolefins, only relatively poor interfacial adhesion exists between the scrim and polyolefin sheets. As a result, the roofing membrane is observed to have only low tensile and seam strength properties. [0004]
  • Accordingly, it is an object of this invention to modify the surface characteristics of one or both of the polyolefin-based layers in order to improve the interfacial bonding between polyolefin and scrim thus proving roofing membranes having enhanced membrane tensile and seam strengths. [0005]
  • This and other objects and features of the invention will be made apparent from the following description thereof. [0006]
    • SUMMARY OF THE INVENTION
  • In this invention, a small amount of a highly-flowable, functional-polyolefin is incorporated into one or both polyolefin-based roofing sheets of a single ply roofing membrane to modify the surface-polarity of the polyolefin sheets therein. The resulting composite membrane of the invention exhibits substantially improved adhesion between the reinforcement scrim and the polyolefin sheets. As a result, the tensile and seam strengths of the membrane is advantageously increased [0007]
    • DETAILED DESCRIPTION OF THE INVENTION
  • In accordance with the invention, there is provided a single ply reinforced roofing membrane having significantly improved tensile and seam strengths. The membrane comprises a reinforcement scrim sandwiched between polyolefin cap and base layers, and is particularly characterized in that at least one of these layers includes a functional-polyolefin as additive therein. The thickness of the membrane preferably ranges from 5 to 200 mils, more preferably from 35-90 mils. [0008]
  • Suitably the single ply reinforced roofing membrane of the invention includes about 0.5-20% by wt. of the functional-polyolefin additive in one of said layers, preferably about 1-10%, and most preferably about 1-5%. [0009]
  • The functional polyolefin additive is suitably selected from polyolelfins which have been modified with one or more functional groups, such as carboxyl, epoxy, anhydride, amine, ester, (meth)acrylate and succinimide groups. [0010]
  • These functional groups can affect the surface of the polyolefin sheets so that it can adhere better to the scrim material. A maleic anhydride-modified polyolefin (CK Witco), an epoxy-modified polyethylene (Elf Atochem) and methyacrylate terpolymers thereof (Elf) are preferred. [0011]
  • Suitable polyolefins are polymers such as polyethylene, polypropylene, terpolymers of ethylene, propylene and diene monomers, ethylene-propylene copolymers, ethylene-butene copolymers, ethylene-hexene copolymers, ethylene-octene copolymers, propylene-C[0012] 4-8 alpha-olefin copolymers, metallocene polyolefins and the like.
  • A preferred functional polyolefin for use herein is maleic anhydride-modified polypropylene sold by CK Witco. [0013]
  • The invention will now be described in more detail with reference to the following examples.[0014]
    • STANDARD EXAMPLE
  • Cap (top) and base (bottom) sheets (layers) of a standard single ply reinforcement polyolefin roofing membrane was made of 100 parts of polyolefin resins, including conventional ingredients, such as 0-80 parts of fire retardant, 0-20 parts of processing oil, ingredients zinc oxide, UV and thermal stabilizers, carbon black, titanium dioxide and calcium carbonate, as is well known in the art. The ingredients were mixed in an extruder at 200° C. and sheeted to a thickness of about 20-30 mils. A reinforcement scrim then was inserted between the top and bottom sheets, and the three layers were pressed into a 45 mil reinforced single ply membrane. The standard membrane then was tested for tensile strength and seam strength. [0015]
    • INVENTION EXAMPLE 1
  • The top sheet of the polyolefin roof membrane was made of the same ingredients as described in the Standard Example. In this example, however, the bottom polyolefin sheet, was admixed with 3 parts by weight of maleic anhydride-polypropylene (CK Witco) before pressing. Then, as usual, the compositions were mixed in an extruder at 200° C. and sheeted to thicknesses of about 20-30 mils. Then a reinforcement scrim was inserted between the top and bottom sheets and the three layers were pressed into a 45 mil single ply reinforced membrane. The resulting membrane was tested for tensile strength and seam strength. [0016]
    • INVENTION EXAMPLE 2
  • Example 1 was repeated except that 2.5 parts by weight of maleic anhydride-polypropylene additive was included in the top sheet of the membrane. [0017]
    • INVENTION EXAMPLE 3
  • Example 1 was repeated except that 1 part of the additive was provided in the bottom layer. [0018]
    • EXAMPLE 4
  • Example 1 was repeated except that 5 parts by weight of the additive was present in the bottom layer. [0019]
    • TEST RESULTS
  • The tensile and seam strengths of the membranes of Invention Examples 1-4, and the Standard Example are given in the Table below. [0020]
    TABLE
    Tensile Strength,* Seam Strength**
    Example No. (psi) (lbs/in)
    Standard 2047 107
    1 3431 160
    2 3288 146
    3 3018 137
    4 3823 141
  • These results show that substantial increases in tensile and seam strengths achieved in the invention Examples when the functional polyolefin additive was present in either the bottom or the top layers, as compared to the Standard Example, without additive. [0021]
  • While the invention has been described with particular reference to certain embodiments thereof, it will be understood that changes and modifications may be made which are within the skill of the art. Accordingly, it is intended to be bound only by the following claims, in which: [0022]

Claims (7)

What is claimed is:
1. A single ply reinforced roofing membrane having advantageous tensile and seam strength comprising a reinforcement scrim sandwiched between polyolefin cap and base layers, characterized in that at least one of said layers includes a functional polyolefin as additive therein.
2. A single ply reinforced roofing membrane according to claim 1 wherein about 0.5-20% by wt. of said functional polyolefin is present in one of said layers.
3. A single ply reinforced roofing membrane according to claim 2 wherein said amount is about 1-10%.
4. A membrane according to claim 3 wherein said amount is 1-5%.
5. A single ply reinforced roofing membrane according to claim 1 wherein said functional polyolefin includes a functional group selected from carboxyl, epoxy, anhydride, amine, ester, (meth)acrylate and succinimide groups.
6. A single ply reinforced roofing membrane according to claim 1 wherein said cap and base polyolefin layers are polymers selected from polyethylene, polypropylene, terpolymers of ethylene, propylene and diene monomers, ethylene-propylene copolymers, ethylene-butene copolymers, ethylene-hexene copolymers, ethylene-octene copolymers, propylene-C4-8 alpha-olefin copolymers and metallocene polyolefin.
7. A single ply reinforced roofing membrane according to claim 2 wherein said additive is selected from maleic anhydride-polyolefin and epoxy polyethylene, and (meth)acrylate terpolymers thereof.
US10/359,424 2000-06-09 2003-02-06 Single ply reinforced roofing membrane Abandoned US20030118852A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US10/359,424 US20030118852A1 (en) 2000-06-09 2003-02-06 Single ply reinforced roofing membrane
US10/627,847 US20040157075A1 (en) 2000-06-09 2003-07-25 Single ply thermoplastic polyolefin (TPO) roofing membranes having superior heat seam peel strengths and low temperature flexibility

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/591,593 US6544909B1 (en) 2000-06-09 2000-06-09 Single ply reinforced roofing membrane
US10/359,424 US20030118852A1 (en) 2000-06-09 2003-02-06 Single ply reinforced roofing membrane

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US09/591,593 Division US6544909B1 (en) 2000-06-09 2000-06-09 Single ply reinforced roofing membrane

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US10/627,847 Continuation-In-Part US20040157075A1 (en) 2000-06-09 2003-07-25 Single ply thermoplastic polyolefin (TPO) roofing membranes having superior heat seam peel strengths and low temperature flexibility

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US10/359,424 Abandoned US20030118852A1 (en) 2000-06-09 2003-02-06 Single ply reinforced roofing membrane

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AU (1) AU2001259347A1 (en)
CA (1) CA2410825C (en)
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WO (1) WO2001096110A1 (en)

Cited By (4)

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US7329631B1 (en) 2004-11-09 2008-02-12 Cafepress.Com Method of applying an image to an object
US20100212235A1 (en) * 2009-02-24 2010-08-26 Primesource Building Products Patterned roofing underlayment
US8557078B2 (en) 2008-06-03 2013-10-15 Cafepress Inc. Applique printing process and machine
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AU2001259347A1 (en) 2001-12-24
US6544909B1 (en) 2003-04-08

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