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US 4,302,370 AGranted
Asbestos-free asphalt roof coating
AssigneeTexas Refinery Corporation
InventorMark W. Buse
Life of this patent
Estimating the term…
Abstract
An asbestos-free asphalt composition is provided of the kind used in roofing applications. A polypropylene carbonate coupling agent is used with high density polyethylene fibers to prevent settling or separation of the components.
Claims10
An asbestos-free composition, comprising:
- asphalt cutback;
- finely divided polyolefin fibers blended with said asphalt cutback to form a suspension of polyolefin fibers in said asphalt cutback;
- propylene carbonate coupling agent, said propylene carbonate being present in an effective amount to maintain said polyolefin fibers in suspension in said asphalt cutback so that substantially no settling-out of the polyolefin fibers occurs.
An asbestos-free asphalt composition, comprising:
- asphalt cutback;
- finely divided fibers of a mono-1-olefin polymers having from 2 to 4 carbon atoms per molecule in a range from about 0.5 to 5.0 weight percent based on the total composition;
- and
- propylene carbonate coupling agent in a range from about 0.5 to 6.0 weight percent based on the total composition.
1 more element
An asbestos-free asphalt composition, comprising:
- asphalt cutback;
- finely divided fibers of a polymer selected from the group consisting of homopolymers or copolymers of ethylene or propylene in a range from about 0.5 to 5.0 weight percent based on the total composition;
- propylene carbonate coupling agent in a range from about 0.5 to 6.0 weight percent based on the total composition.
An asbestos-free asphalt composition, comprising:
- asphalt cutback, wherein said asphalt cutback comprises approximately 70 weight percent asphalt and 30 weight percent solvent for said asphalt;
- approximately 3.5 weight percent calcium carbonate filler based on the total composition;
- approximately 2.0 weight percent finely divided fibers of high density polyethylene based on the total composition;
- and
- approximately 2.0 weight percent propylene carbonate coupling agent based on the total composition.
2 more elements
A method for producing an asbestos-free asphalt composition comprising the steps of:
- simultaneously adding asphalt cutback and propylene carbonate coupling agent to a mixing vessel, said propylene carbonate being present a range between about 0.5 and 6.0 weight percent based on the total composition;
- slowly mixing the contents of the vessel until they are thoroughly blended;
- adding finely divided fibers of a polymer selected from the group consisting of homopolymers or copolymers of ethylene or propylene, said finely divided fibers being present in a range between about 0.5 to 5.0 weight percent based on the total composition, and mixing thoroughly;
- and
- adding a particulate filler, said filler being present in a range between about 2 to 30 weight percent based on the total composition, and mixing thoroughly.
2 more elements
A method for producing an asbestos-free asphalt composition comprising the steps of:
- simultaneously adding approximately 92.5 weight percent asphalt cutback and 2.0 weight percent propylene carbonate coupling agent based on the total composition to a mixing vessel;
- slowly mixing the contents of the vessel until they are thoroughly blended;
- adding approximately 2.0 weight percent high density polyethylene fibers based on the total composition and mixing thoroughly;
- and
- adding approximately 3.5 weight percent calcium carbonate filler based on the total composition and mixing thoroughly.
2 more elements
Dependencies are inferred from the claim text.