# US 5,703,154 A · Premolded pipe flashing compositions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,703,154 A - Document ID: US5703154A - Status: Granted - Kind: A - Application number: 08/678,205 - Filed: 1996-07-11 - Granted: 1997-12-30 - Earliest claimed: 1996-07-11 - Assignees: Bridgestone/Firestone, Inc. - Inventors: James A. Davis; William A. Wasitis; William F. Barham - Web page: https://patentgrep.com/patent/US5703154A ## CPC - E04D 13/1407: {for flat roofs} - C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators} - C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers - C08L 2205/02: containing two or more polymers of the same C08L -group - E04D: ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS (coverings of outer walls by plaster or other porous material E04F13/00) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A premolded EPDM pipe flashing composition comprises 100 parts by weight of an elastomeric polymer comprising from about 70 to 95 parts by weight of at least one amorphous ethylene-propylene-diene terpolymer and from 5 to about 30 parts by weight of at least one crystalline or semi-crystalline ethylene-propylene-diene terpolymer; from about 35 to 175 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of the polymer; from about 30 to 110 parts by weight of a processing material and mixtures thereof, per 100 parts of the polymer; and from about 0.6 to 7.5 parts by weight of a cure package, per 100 parts of the polymer, the cure package comprising from about 0.1 to 1.5 parts by weight sulfur and from 0.5 to 6 parts by weight of at least one sulfur vulcanizing accelerator. The premolded EPDM pipe flashing composition provides dimensional stability substantially equivalent to conventional black EPDM roofing membranes and meets the weathering, UV and heat aging resistance requirements as well as the viscosity, low temperature flexibility, and cured physical properties desired of commercial EPDM pipe flashing compositions. ## Claims ### Claim 1 A premolded pipe flashing composition comprising: 100 parts by weight of an elastomeric polymer comprising from about 70 to about 95 parts by weight of at least one essentially amorphous ethylene-propylene-diene terpolymer; and from about 5 to about 30 parts by weight of at least one essentially crystalline or semi-crystalline ethylene-propylene-diene terpolymer having at least about 3 weight percent unsaturation; from about 35 to about 175 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing fillers and mixtures thereof, per 100 parts of said polymer; from about 30 to about 110 parts by weight of a processing material selected from the group consisting of paraffinic oils, naphthenic oils and waxes and mixtures thereof, per 100 parts of said polymer; and from about 0.6 to about 7.5 parts by weight of a cure package, per 100 parts of said polymer, said cure package comprising from about 0.1 to 1.5 parts by weight sulfur and from about 0.5 to 6 parts by weight of at least one sulfur vulcanizing accelerator. ### Claim 2 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said elastomeric polymer includes about 80 to 85 parts by weight of said at least one ethylene-propylene-diene terpolymer having up to about 1 percent by weight crystallinity; and from about 15 to about 20 parts by weight of said ethylene-propylene-diene terpolymer having at least about 1 percent by weight crystallinity. ### Claim 3 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said filler comprises about 110 parts by weight of carbon black and said composition includes about 82 parts by weight of said processing material. ### Claim 4 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said filler further includes mineral fillers selected from the group consisting of hard clays, soft clays, chemically modified clays, mica, talc, alumina trihydrate, calcium carbonate, titanium dioxide, amorphous precipitated hydrated silica and mixtures thereof. ### Claim 5 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said sulfur vulcanizing accelerator is selected from the group consisting of thiuram monosulfides and disulfides; benzothiazole sulfenamides; dithiocarbamates; 2-mercaptoimidazoline; 2-mercaptobenzothiazole; 2-(morpholinodithio)-benzothiazole disulfide; zinc 2-mercaptobenzothiazole and dithiodimorpholine. ### Claim 6 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said cure package contains about 0.95 parts by weight sulfur, about 0.5 to about 3 parts by weight TMTDS and about 1 part by weight Sulfasan DTDM. ### Claim 7 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said cure package is devoid of hexasulfides and thioureas. ### Claim 8 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, having a thickness ranging from 55 to 60 mils. ### Claim 9 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, having a tensile strength of at least about 1400 psi. ### Claim 10 (depends on 1) A premolded pipe flashing composition, as set forth in claim 1, wherein said composition is about 90% cured within about 15 minutes at 340.degree. F. ### Claim 11 A method for developing a water-tight seal around an object protruding from the top of a roof comprising the step of: positioning a premoled EPDM pipe flashing around said protruding object such that a portion of said pipe flashing is in contact with said object and another portion of said pipe flashing is in contact with said roof, said pipe flashing comprising 100parts by weight of an elastomeric polymer comprising from about 70 to 95 parts by weight of at least one amorphous ethylene-propylene-diene terpolymer; and from 5 to about 30 parts by weight of at least one crystalline or semi-crystalline ethylene-propylene-diene terpolymer; from about 35 to 175 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of the polymer; from about 30 to 110 parts by weight of a processing material and mixtures thereof, per 100 parts of the polymer; and from about 0.6 to 7.5 parts by weight of a cure package per 100 parts of the polymer, the cure package comprising from about 0.1 to 1.5 parts by weight sulfur and from about 0.5 to 6 parts by weight of at least one sulfur vulcanizing accelerator. ### Claim 12 (depends on 11) A method, as set forth in claim 11, wherein said elastomeric polymer includes about 80 to 85 parts by weight of said at least one ethylene-propylene-diene terpolymer having up to about 1 percent by weight crystallinity; and from about 15 to about 20 parts by weight of said ethylene-propylene-diene terpolymer having at least about 1 percent by weight crystallinity. ### Claim 13 (depends on 11) A method, as set forth in claim 11, wherein said filler comprises about 110 parts by weight of carbon black and said composition includes about 82 parts by weight of said processing material. ### Claim 14 (depends on 11) A method, as set forth in claim 11, wherein said filler further includes mineral fillers selected from the group consisting of hard clays, soft clays, chemically modified clays, mica, talc, alumina trihydrate, calcium carbonate, titanium dioxide, amorphous precipitated hydrated silica and mixtures thereof. ### Claim 15 (depends on 11) A method, as set forth in claim 11, wherein said sulfur vulcanizing accelerator is selected from the group consisting of thiuram monosulfides and disulfides; benzothiazole sulfenamides; dithiocarbamates; 2-mercaptoimidazoline; 2-mercaptobenzothiazole; 2-(morpholinodithio)benzothiazole disulfide; zinc 2-mercaptobenzothiazole and dithiodimorpholine. ### Claim 16 (depends on 11) A method, as set forth in claim 11, wherein said cure package contains about 0.95 parts by weight sulfur, about 0.5 to about 3 parts by weight TMTDS and about 1 part by weight Sulfasan DTDM. ### Claim 17 (depends on 11) A method, as set forth in claim 11, wherein said cure package is devoid of hexasulfides and thioureas. ### Claim 18 (depends on 11) A method, as set forth in claim 11, having a thickness ranging from 55 to 60 mils. ### Claim 19 (depends on 11) A method, as set forth in claim 11, having a tensile strength of at least about 1400 psi. ### Claim 20 (depends on 11) A method, as set forth in claim 11, wherein said composition is about 90% cured within about 15 minutes at 340.degree. F.