WO1996000335A1 - Open-cell foams in roofing systems - Google Patents
Open-cell foams in roofing systems Download PDFInfo
- Publication number
- WO1996000335A1 WO1996000335A1 PCT/US1995/004261 US9504261W WO9600335A1 WO 1996000335 A1 WO1996000335 A1 WO 1996000335A1 US 9504261 W US9504261 W US 9504261W WO 9600335 A1 WO9600335 A1 WO 9600335A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foam
- membrane
- alkenyl aromatic
- percent
- roofing system
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D11/00—Roof covering, as far as not restricted to features covered by only one of groups E04D1/00 - E04D9/00; Roof covering in ways not provided for by groups E04D1/00 - E04D9/00, e.g. built-up roofs, elevated load-supporting roof coverings
- E04D11/02—Build-up roofs, i.e. consisting of two or more layers bonded together in situ, at least one of the layers being of watertight composition
Definitions
- This invention relates to a method of employing an extruded, open-cell alkenyl aromatic polymer foam in roofing systems
- roofing systems typically comprise multiple layers of various materials configured to protect and optionally to insulate a roof deck or upper surface of a structure or building The roofing system protects the deck and the interior of the structure from the weather, including wind, rain, and other precipitation
- the critical component of a roofing system is the membrane
- the membrane is a sheet or mat of a solid, elastome ⁇ c substance which protects the deck from the aforementioned weather elements.
- Conventional membranes include those of EPDM (ethylene-propylene-diene elastomer), modified bitumen, and plasticized polyvinylchlo ⁇ de
- EPDM ethylene-propylene-diene elastomer
- modified bitumen modified bitumen
- plasticized polyvinylchlo ⁇ de The membrane may be dark, medium, or light in color, but is usually dark
- the protective layer may take the form of an insulative plastic foam or, more commonly, a non-foam material such as a wood or wood composite panel
- plastic foams include polystyrene bead foam, closed-cell extruded polystyrene foam, and closed-cell polyisocyanurate and polyurethane foams.
- a paving layer may be placed or laid on top of the membrane
- the paving layer typically comprises materials such as gravel or stone ballast, shingles, brick, or concrete.
- the paving layer functions to physically protect the membrane from foot traffic and direct exposure to sunlight and the weather.
- a protective layer is applied or laid on top of the existing roofing system, usually an old membrane or an old paving layer; a new membrane is applied or laid on top of the protective layer; and, optionally, a new paving layer is applied on top of the new membrane
- the protective layer protects the new membrane from the rough and uneven surfaces often encountered on the upper surfaces of existing roofing systems, provides mechanical support underneath the new membrane, and, in the case of plastic foams, provides additional insulation.
- a problem commonly encountered with roofing systems is rupture of the membrane due to distortion or deterioration of the protective layer underneath the membrane.
- the distortion and deterioration problems arise from the exposure of the protective layer to extreme heat from direct sunlight or moisture buildup due to weather exposure.
- the membrane which is typically dark and elastomeric, absorbs significant heat from the sunlight, and further does not allow Tor timely escape of moisture trapped underneath it
- the membrane and the protective layer may separate to form void pockets, which leave the membrane with diminished mechanical support on its undersurface The diminished support renders the membrane more subject to rupture
- the source of distortion and deterioration problems of the material in the protective layer varies according to the nature of the material Some materials are susceptible to heat, some are susceptible to moisture, and some have inherently low mechanical strength
- Extruded, closed-cell polystyrene foams offer excellent mechanical strength and water resistance, but can become distorted at high service temperatures (greater than 165°F) due to their relatively low heat distortion temperature Such high service temperatures are typically encountered under a dark membrane in direct sunlight
- Expanded polystyrene bead foams typically better maintain their shape in a high temperature environment than extruded, closed-cell polystyrene foams because they typically have better bowing characteristics Their bowing characteristics are better because the coalesced expanded bead structure allows for greater mechanical relaxation compared to the solid, cellular form of extruded, closed-cell foams However, the coalesced expanded bead structure also results in lower mechanical strength and lower resistance to water transmission
- Closed-cell polyisocyanate foams have high heat distortion temperatures (250°F- 275°F) ( 121 °C-135°C), but have poor moisture resistance Moisture weakens the cellular structure of such foams, and renders them subject to physical deterioration over time Moisture also diminishes the insulation value of the foam They are also relatively friable, which affects their handling characteristics
- Closed-cell polyurethane foams like closed-cell polyisocyanate foams, have high heat distortion temperatures and poor moisture resistance They are also relatively friable, which affects their handling characteristics
- Wood panels and wood composite panels have high heat distortion temperatures, but have poor moisture resistance Moisture weakens the wood, and renders it subject to physical deterioration over time Further, the panels provide little insulation compared to foams
- a roofing system for a structure The process comprises a roof deck, a protective layer of a plurality of panels of an extruded alkenyl aromatic polymer foam situated above and adjacent the deck, and a substantially waterproof
- SUBSTITUTE SHEET (RULE 261 membrane situated above and adjacent to the foam
- the foam comprises an alkenyl aromatic polymer material having greater than 50 percent by weight alkenyl aromatic monome ⁇ c units, and has from 30 to 80 percent open cell content
- the roofing system comprises a pre-existing roofing system; a protective layer of a plurality of panels of an extruded alkenyl aromatic polymer foam situated above and adjacent the pre-existing roofing system, a substantially waterproof second membrane situated above and adjacent to the foam
- the pre-existing roofing system comprises a roof deck and a first membrane situated above and adjacent the roof deck
- a process for constructing a roofing system for a structure comprises providing a roof deck; applying above and adjacent to the upper surface of the roof deck a protective layer of a plurality of panels of an extruded alkenyl aromatic polymer foam; and applying a substantially waterproof membrane above and adjacent to the upper surface of the foam
- a process for constructing a recovery roofing system for a structure comprises providing a pre-existing roofing system; applying above and adjacent to the upper surface of the pre-existing roofing system a protective layer of a plurality of panels of an extruded alkenyl aromatic polymer foam; and applying above (on top of) and adjacent to the upper surface of the foam a second membrane which is substantially waterproof
- the pre-existing roofing system comprises a roof deck and a first membrane situated above and adjacent the roof deck
- the protective layer is situated adjacent to and preferably contiguous to the membrane Being contiguous is preferred because maximum physical protection is afforded the membrane
- any component (roofing decks, membranes, protective layers, paving layers) of a roofing system or replacement roofing system is described as being adjacent to another component, they are situated in parallel and proximity to one another, but may or may not be in direct physical contact When a component is described as being contiguous to another component, they are in direct physical contact
- Figure 1 is a cross-sectional view of a roofing system of the present invention
- Figure 2 is a cross-sectional view of a recovery roofing system of the present invention
- FIG. 3 is a cut away view of the roofing system illustrated in Figure 1
- Figure 4 is a cut away view of the recovery roofing system illustrated in Figure 2
- the present invention affords new roofing systems and recovery roofing systems with enhanced longevity and performance Longevity and performance are enhanced by improving the physical support and integrity of the roofing membrane The improved physical support and integrity make the formation of membrane rupture less likely, resulting in a reduced incidence of water leakage through the roofing system
- the physical support and integrity of the membrane is enhanced by employing a protective layer of an extruded, open-cell alkenyl aromatic polymer foam underneath the membrane
- the foam offers excellent heat and moisture resistance and mechanical strength
- the foam further enhances the heat insulation of the roofing system
- roofing system 20 comprises in sequence a roof deck 10, a protective (foam) layer 12, a membrane 14, and a paving layer 16 stacked one on top of the other
- Protective layer 12 comprises the extruded, open-cell alkenyl aromatic foam described herein If insulation additional to that provided by protective layer 12 is desired, an insulating foam plastic material such as an extruded, closed-cell alkenyl aromatic polymer foam may be provided between protective layer 12 and roofing deck 10 It is understood that paving layers in the embodiments herein are optional
- FIGS 2 and 4 illustrate an embodiment of a recovery roofing system 34 of the present invention
- the pre-existing roofing system comprises a roof deck 22, a first membrane 24, and a first paving layer 26
- the new roofing system comprises protective layer 28, second membrane 30, and second paving layer 32 If insulation additional to that provided by protective layer 28 is desired, another layer of an insulating foam plastic material such as an extruded, closed-cell alkenyl aromatic polymer foam may be provided between the first paving layer 26 and protective layer 28
- the extruded, alkenyl aromatic polymer foam provides enhanced performance in roofing systems over other materials employed in protective layers for roofing membranes in the prior art
- the extruded, open-cell foam offers moisture resistance and mechanical strength similar to that of a corresponding extruded, closed-cell alkenyl aromatic polymer foam, but also affords a higher heat distortion temperature
- the open-cell foam has a heat distortion temperature up to 210°F (99°C), while the closed-cell foam has one of up to 175°F (79°C)
- the higher heat distortion temperature is believed due to the open-cell structure, which allows cell gas pressure to be relieved more readily than a closed-cell structure
- the extruded, open-cell foam affords a better heat distortion temperature than a corresponding expanded bead polystyrene foam, and has better mechanical strength and exhibits much lower water transmission
- the extruded, open-cell foam has a unitary, cellular structure rather than a coalesced bead structure like the bead foam
- the extruded, open-cell foam exhibits much better moisture resistance than a closed-cell polyisocyanate foam or polyurethane foam, and, thus, is much less subject to physical deterioration
- the open-cell foam affords a lower range of heat distortion temperatures than the polyisocyanate or polyurethane foam, but the afforded range is entirely sufficient for temperatures commonly encountered in roofing applications
- the open-cell foam is more rigid, which makes it more effective in providing mechanical support
- the open-cell foam has friability characteristics (less friability) superior to those of polyisocyanurate and polyurethane foams
- the extruded, open-cell foam exhibits much better moisture resistance than a wood or wood composite panel
- the open-cell foam affords heat distortion temperatures less than that of the wood or wood composite panel, but affords a range which is entirely sufficient for temperatures commonly encountered in roofing applications Further, the open-cell foam provides much better insulation per unit thickness than the wood or wood composite panel
- the open-cell foam has a heat distortion temperature of from 175°F to 210°F (79°C to 99°C) and more preferably from 190°F to 205°F (88°C to 96°C) according to ASTM D-2126-87
- the high heat distortion temperature of the foam enables it to be employed in high service temperature environments ( 175°F to 210°F) (79°C to 99°C) such as underneath dark roofing membranes in direct sunlight
- the present foam has an excellent heat distortion temperature due to its open-cell structure
- the open-cell foam has an open cell content of 30 percent or more, preferably of 30 to 80 percent, and most preferably 40 to 60 percent according to ASTM D2856-87
- the open-cell foam has a density of 1 5 pcf to 6 0 pcf (24 kg/m 3 to 96 kg/m3) and preferably a density of 2 0 pcf to 3 5 pcf (32 kg/m3 to 48 kg/m3) according to ASTM D-1622-88
- the open-cell foam has an average cell size of from 0 08 millimeters (mm) to 1 2 mm and preferably from 0 10 mm to 0 9 mm according to ASTM D3576-77
- the open-cell foam is particularly suited to be formed into a plank, desirably one having a minor dimension in cross-section (thickness) of greater than 0 25 inches (6 4 millimeters) or more and preferably 0 375 inches (9 5 millimeters) or more Further, preferably, the foam has a cross-sectional area of 30 square centimeters (cm) or more
- the open-cell foam is substantially non-crosslinked
- substantially non-crosslmked means the foam is substantially free of cross nking, but is inclusive of the slight degree of crosslinking which may occur naturally without the use of crosshnking agents or radiation
- a substantially non-crosslinked foam has less than 5 percent gel per ASTM D-2765-84, method A
- the open-cell foam comprises an alkenyl aromatic polymer material
- Suitable alkenyl aromatic polymer materials include alkenyl aromatic homopolymers and copolymers of alkenyl aromatic compounds and copolymenzable ethylenically unsaturated comonomers
- the alkenyl aromatic polymer material may further include minor proportions of non-alkenyl aromatic polymers
- the alkenyl aromatic polymer material may be comprised solely of one or more alkenyl aromatic homopolymers, one or more alkenyl aromatic copolymers, a blend of one or more of each of alkenyl aromatic homopolymers and copolymers, or blends of any of the foregoing with a non-alkenyl aromatic polymer Regardless of composition, the alkenyl aromatic polymer material comprises greater than 50 and preferably greater than 70 weight percent alkenyl aromatic monome ⁇ c units Most preferably, the alkenyl aromatic polymer material is comprised entirely of alkenyl aromatic monome ⁇ c units
- Suitable alkenyl aromatic polymers include those derived from alkenyl aromatic compounds such as styrene, alphamethylstyrene, ethylstyrene, vinyl benzene, vinyl toluene, chlorostyrene, and bromostyrene
- a preferred alkenyl aromatic polymer is polystyrene Minor amounts of monoethylenically unsaturated compounds such as C 2 _6 alkyl acids and esters, lonome ⁇ c derivatives, and C 4 6 dienes may be copolyme ⁇ zed with alkenyl aromatic compounds
- copolymenzable compounds include acrylic acid, methacrylic acid, ethacrylic acid, maleic acid, itaconic acid, acrylonitrile, maleic anhydride, methyl acrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, methyl methacrylate, and vinyl acetate
- the foams are preferably substantially
- the open-cell foam is generally prepared by heating an alkenyl aromatic polymer material to form a plasticized or melt polymer material, incorporating therein a blowing agent to form a foamable gel, and extruding the gel through a die to form the foam product
- the polymer material Prior to mixing with the blowing agent, the polymer material is heated to a temperature at or above its glass transition temperature or melting point
- the blowing agent may be incorporated or mixed into the melt polymer material by any means known in the art such as with an extruder, mixer, or blender
- the blowing agent is mixed with the melt polymer material at an elevated pressure sufficient to prevent substantial expansion of the melt polymer material and to generally disperse the blowing agent homogeneously therein
- a nucleating is blended in the polymer melt or dry blended with the polymer material prior to plasticizing or melting
- the foamable gel is typically cooled to a lower temperature to optimize or attain desired physical characteristics of the foam
- the gel may be cooled in the extruder or other mixing device or in separate cooler
- the foam may be prepared by. a) heating an alkenyl aromatic polymer material comprising more than 50 percent by weight alkenyl aromatic monome ⁇ c units to form a melt polymer material; b) incorporating into the melt polymer material an amount of a nucleating agent sufficient to result in a foam having from 30 percent to 80 per - > nt open cell content, c) incorporating into the melt polymer material at an elevated pressure a blowing agent to form a foamable gel , d) cooling the foamable gel to a suitable foaming temperature, and e) extruding the foamable gel through a die into a region of lower pressure to form the foam
- the foaming temperature ranges from 1 18°C to 145°C wherein the foaming temperature is from 3 U C to 15 C C higher than the highest foaming temperature for a corresponding closed-cell foam
- the foaming temperature must be 133°C or more
- the foaming temperature further must be 33°C or more higher than the glass transition temperature (according to ASTM D-
- blowing agent useful in making extruded alkenyl aromatic polymer foams
- Useful blowing agents include 1 -chloro-1 , 1 -d ⁇ fluoroethane (HCFC- 142b), chlorod ⁇ fluoromethane (HCFC-22), 1 , 1 -d ⁇ fluoroethane (HFC- 152a), 1 , 1 , 1 -t ⁇ fluoroethane (HFC 143a), 1 , 1 , 1 ,2-tetrafluoroethane (HFC- 134a), water ethanol, carbon dioxide, ethyl chloride, and mixtures of the foregoing
- a preferred blowing agent comprises a mixture of carbon dioxide and ethyl chloride
- nucleating agent employed will vary according to desired cell size, foaming temperature, and composition of the nucleating agent Open-cell content increases with increasing nucleating agent content
- Useful nucleating agents include calcium carbonate, calcium stearate, talc, clay, titanium dioxide, silica, barium stearate, diatomaceous earth, and mixtures of citric acid and sodium bicarbonate
- Preferred nucleating agents are talc and calcium stearate
- the amount of nucleating agent employed may range from 0 01 to 5 parts by weight per hundred parts by weight of a polymer resin The preferred range is from 0 4 to 3 0 parts by weight
- the open-cell foam optionally further comprises carbon black Carbon black enhances the thermal resistance or insulation of the foam
- the carbon black may comprise between 1 0 and 25 weight percent and preferably between 4 0 and 10 0 weight percent based upon the weight of the alkenyl aromatic polymer material in the foam
- the carbon black may be of any type known in the art such as furnace black, thermal black, acetylene black, and channel black
- a preferred carbon black is thermal black
- a preferred thermal black has an average particle size of 150 nanometers or more
- ethylene polymer such as linear low density polyethylene or high density polyethylene may be incorporated into the foamable gel to enhance open-cell content upon extrusion and foaming
- additives may be incorporated in the foam such as inorganic fillers, pigments, antioxidants, acid scavengers, ultraviolet absorbers, flame retardants, processing aids, and extrusion aids
- inorganic fillers pigments, antioxidants, acid scavengers, ultraviolet absorbers, flame retardants, processing aids, and extrusion aids
- Open-cell alkenyl aromatic polymer foam structures of the present invention are made according to the process of the present invention Example 1
- the foam had 50 to 70 percent open cell content, 2.19 pcf (35 kg/r ⁇ )3), and a 0.30 millimeter cell size
- the bowing characteristics of the foam were excellent considering the extreme temperature conditions to which the foam was exposed.
- the maximum bow was an average of 17 millimeters.
- Bowing was determined by measuring the distance from the bottom of the foam to the platform. If the foams were placed on a roof under a membrane, bowing would be less because of the restraining influence of the membrane. Under normal hot-roof conditions under a membrane, such as exposure temperatures of 190°F or less, preferred foams would have a maximum bow of not more than 6 millimeters.
- the sample had 50 to 70 percent open cell content, 2.19 pcf (35 kg/m3), and a 0.30 millimeter cell size
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95915582A EP0766768A1 (en) | 1994-06-23 | 1995-04-06 | Open-cell foams in roofing systems |
US08/737,203 US5784845A (en) | 1995-04-06 | 1995-04-06 | Open-cell foams in roofing systems |
MX9606742A MX9606742A (en) | 1994-08-29 | 1995-04-06 | Open-cell foams in roofing systems. |
JP8503116A JPH10502144A (en) | 1994-06-23 | 1995-04-06 | Open cell foam in roofing system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26467794A | 1994-06-23 | 1994-06-23 | |
US08/264,677 | 1994-06-23 | ||
US08/297,356 US5557896A (en) | 1994-06-23 | 1994-08-29 | Method of employing an extruded open-cell alkenyl aromatic foam in roofing systems |
US08/297,356 | 1994-08-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996000335A1 true WO1996000335A1 (en) | 1996-01-04 |
Family
ID=26950695
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/004261 WO1996000335A1 (en) | 1994-06-23 | 1995-04-06 | Open-cell foams in roofing systems |
Country Status (5)
Country | Link |
---|---|
US (1) | US5557896A (en) |
EP (1) | EP0766768A1 (en) |
JP (1) | JPH10502144A (en) |
CA (1) | CA2189663A1 (en) |
WO (1) | WO1996000335A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8512012B2 (en) | 2004-03-18 | 2013-08-20 | Circulite, Inc. | Pump |
CN109653452A (en) * | 2019-01-02 | 2019-04-19 | 绿建大地建设发展有限公司 | Passive type super low energy consumption does the waterproof integrated construction method of operation roof heat insulation |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5784845A (en) * | 1995-04-06 | 1998-07-28 | The Dow Chemical Company | Open-cell foams in roofing systems |
WO1996034038A1 (en) * | 1995-04-27 | 1996-10-31 | The Dow Chemical Company | Extruded, open-cell microcellular foams, and their preparation process |
US5749195A (en) * | 1996-12-10 | 1998-05-12 | Laventure; David | Sealing membrane and method of sealing |
US5962545A (en) * | 1997-06-23 | 1999-10-05 | The Dow Chemical Company | Method of enhancing open cell formation in alkenyl aromatic polymer foams |
US6048909A (en) * | 1998-12-04 | 2000-04-11 | The Dow Chemical Company | Foams having increased heat distortion temperature made from blends of alkenyl aromatic polymers and alpha-olefin/vinyl or vinylidene aromatic and/or sterically hindered aliphatic or cycloaliphatic vinyl or vinylidene interpolymers |
US6460304B1 (en) * | 1999-04-07 | 2002-10-08 | Choong-Yup Kim | Waterproofing structure and construction method therefor |
US6418687B1 (en) * | 2000-08-08 | 2002-07-16 | Stanley Alfred Cox | Insulated roofing system |
US7972688B2 (en) * | 2005-02-01 | 2011-07-05 | Letts John B | High density polyurethane and polyisocyanurate construction boards and composite boards |
US7765756B2 (en) * | 2005-02-25 | 2010-08-03 | Bontrager Ii Arley L | Low noise roof deck system |
US7601282B2 (en) * | 2005-10-24 | 2009-10-13 | Johns Manville | Processes for forming a fiber-reinforced product |
US7743573B1 (en) * | 2007-09-17 | 2010-06-29 | Engineering Innovations, LLC | Roofing composition |
CN101925708B (en) * | 2008-01-23 | 2012-02-22 | 陶氏环球技术公司 | Building structures containing external vapor permeable foam insulation material and method for insulation for building structures |
IT1397297B1 (en) * | 2009-11-25 | 2013-01-04 | Polymtec Trading Ag Ora Polymtec Engineering Ag | ARTICLE BASED ON EXTRUDED POLYSTYRENE, PROCEDURE AND PLANT TO OBTAIN THIS ITEM |
US10870987B1 (en) * | 2017-12-04 | 2020-12-22 | Firestone Building Products Company, Llc | Isocyanate-based foam construction boards |
MX2022006152A (en) | 2019-11-26 | 2022-08-08 | Bmic Llc | Roofing panels with water shedding features. |
CA3165523A1 (en) * | 2020-01-17 | 2021-07-22 | Bmic Llc | Roofing panels with integrated watershedding |
US11788293B2 (en) * | 2020-05-22 | 2023-10-17 | Brian Booth | Composite shield roofing system |
MX2022006329A (en) | 2021-05-25 | 2022-11-28 | Bmic Llc | Panelized roofing system. |
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US3862527A (en) * | 1973-06-14 | 1975-01-28 | Harry S Peterson Company | Roof construction |
EP0084226A1 (en) * | 1981-12-16 | 1983-07-27 | Mobil Oil Corporation | Process for preparing a poly(p-methylstyrene) foam |
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US2861525A (en) * | 1956-01-30 | 1958-11-25 | Lexsuco Inc | Fire retardant roof vapor barrier and securement means |
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US3411256A (en) * | 1965-10-14 | 1968-11-19 | Dow Chemical Co | Roof construction and method thereof |
US4235058A (en) * | 1978-10-19 | 1980-11-25 | Johns-Manville Corporation | Roof structure and method of making the same |
US5147894A (en) * | 1990-02-12 | 1992-09-15 | General Electric Co. | Polyphenylene oxide-recycled polystyrene composition and method |
US5244928A (en) * | 1992-08-07 | 1993-09-14 | The Dow Chemical Company | Foamable composition and process for making large cell size alkenyl aromatic polymer foam structure with 1,1-difluoroethane |
US5373026A (en) * | 1992-12-15 | 1994-12-13 | The Dow Chemical Company | Methods of insulating with plastic structures containing thermal grade carbon black |
US5411687A (en) * | 1994-06-23 | 1995-05-02 | The Dow Chemical Company | Extruded, open-cell alkenyl aromatic polymer foam and process for making |
-
1994
- 1994-08-29 US US08/297,356 patent/US5557896A/en not_active Expired - Fee Related
-
1995
- 1995-04-06 EP EP95915582A patent/EP0766768A1/en not_active Ceased
- 1995-04-06 JP JP8503116A patent/JPH10502144A/en active Pending
- 1995-04-06 CA CA002189663A patent/CA2189663A1/en not_active Abandoned
- 1995-04-06 WO PCT/US1995/004261 patent/WO1996000335A1/en not_active Application Discontinuation
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US3862527A (en) * | 1973-06-14 | 1975-01-28 | Harry S Peterson Company | Roof construction |
US4532265A (en) * | 1980-04-18 | 1985-07-30 | The Dow Chemical Company | Alkenyl aromatic monomer olefinically unsaturated acid foams and method for the preparation thereof |
EP0084226A1 (en) * | 1981-12-16 | 1983-07-27 | Mobil Oil Corporation | Process for preparing a poly(p-methylstyrene) foam |
FR2552801A1 (en) * | 1983-10-04 | 1985-04-05 | Soprema Sa | System for insulating roofs |
DE3444728A1 (en) * | 1984-12-07 | 1986-06-12 | Christoph M. 2808 Syke Franke | Insulating elements which can be laid on a roof or a wall, and reversed roof produced therewith |
JPH0321645A (en) * | 1989-06-20 | 1991-01-30 | Mitsui Toatsu Chem Inc | Foamed polystyrene sheet and production thereof |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8512012B2 (en) | 2004-03-18 | 2013-08-20 | Circulite, Inc. | Pump |
CN109653452A (en) * | 2019-01-02 | 2019-04-19 | 绿建大地建设发展有限公司 | Passive type super low energy consumption does the waterproof integrated construction method of operation roof heat insulation |
Also Published As
Publication number | Publication date |
---|---|
US5557896A (en) | 1996-09-24 |
JPH10502144A (en) | 1998-02-24 |
CA2189663A1 (en) | 1996-01-04 |
EP0766768A1 (en) | 1997-04-09 |
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