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AssigneeAmerican Gilsonite Company
InventorCarl B. Dorius
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A water retardant composition comprising a mixture of a low density granular mineral material coated with a water repellant material, and a finally divided limestone or other carbonate or silicate mineral particles also coated with a water repellant material. The low density granular mineral material is preferably selected from the group consisting of expanded perlite, expanded vermiculite, expanded shale and pumice rock. The carbonate or silicate mineral particles are preferably selected from the group consisting of talc, clay, sericite, unexpanded perlite, magnesium silicate and aluminum silicate. Preferably, the low density granular mineral material is coated with a silicone or asphalt, while the limestone or other carbonate or silicate mineral material is preferably coated with a silicone or a salt of stearic acid. The composition exhibits excellent load bearing properties and resistance to water penetration through the matrix and provides improved thermal insulation and corrosion protection when packed around underground structures.
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a water repellant material;
The method of thermally insulating and protecting a structure from corrosion comprising covering at least a portion of said structure with a layer of insulating composition comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a water repellant material;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a salt of stearic acid;
The method of thermally insulating and protecting a structure from corrosion comprising covering at least a portion of said structure with a layer of insulating composition comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a salt of stearic acid;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a silicone;
The method of thermally insulating and protecting a structure from corrosion comprising covering at least a portion of said structure with a layer of insulating composition comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a silicone;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume mineral particles not having vesicular pores, said mineral particles being selected from the group consisting of silicate minerals and carbonate minerals, said particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a water repellant material;
The method of thermally insulating and protecting a structure from corrosion comprising covering at least a portion of said structure with a layer of insulating composition comprising a mixture of about 80% to about 20% by volume mineral particles not having vesicular pores, said mineral particles being selected from the group consisting of silicate minerals and carbonate minerals, said particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a water repellant material;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume mineral particles not having vesicular pores, said mineral particles being selected from the group consisting of silicate minerals and carbonate minerals, said particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a silicone;
The method of thermally insulating and protecting a structure from corrosion comprising covering at least a portion of said structure with a layer of insulating composition comprising a mixture of about 80% to about 20% by volume mineral particles not having vesicular pores, said mineral particles being selected from the group consisting of silicate minerals and carbonate minerals, said particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a silicone;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with calcium stearate;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume limestone particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a silicone;
A composition for thermally insulating and protecting structures against corrosion comprising a mixture of about 80% to about 20% by volume talc particles having a particle size smaller than about 150 mesh Tyler standard sieve size, said particles being coated with a silicone;
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Coating or impregnating: with organic materials
Compositions for artificial stone, not containing binders
Lime, magnesia
Term ended 4 Nov 1997 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
The present invention relates to a composition and method for insulating and protecting structures and, in particular, relates to a composition and method for thermally insulating underground structures and protecting them from corrosion.
In the past, pipes and other structures, particularly underground structures, have been thermally insulated and protected from corrosion by surrounding the structures with various materials such as water repellent granules, various wraps, conduits and the like. Since subterranean structures are frequently subjected to moisture conditions in excess of several feet of hydrostatic head, the problem commonly encountered in the art is to adequately protect these structures from corrosion as a result of moisture intrusion and to provide adequate thermal insulation against heat losses under such conditions.
One prior method of providing thermal insulation and corrosion protection to underground structures was to surround the structure with finely pulverized limestone particles having a water repellent organic coating. Although this material exhibited suitable water repellent properties, due in part to the finely divided nature of the material, it was difficult to handle and to properly compact around the underground structure as a result of its finely divided nature. When the underground structure is being buried, improper compaction of the material around the structure enables foreign objects such as dirt and rocks to penetrate the insulating envelope of material surrounding the structure, thereby destroying the water repellant integrity of the envelope. The presence of the foreign objects in the envelope permits the penetration of moisture into the envelope, resulting in a substantial loss in thermal insulating efficiency as well as the corrosion of the structure.
The present invention contemplates a composition and method for insulating and protecting structures. The composition consists of discrete granular particles and comprises a mixture of a low density granular mineral material and a finely divided limestone or other carbonate or silicate mineral particles. Both the low density granular mineral material and the finely divided carbonate or silicate mineral particles are coated with a water repellant material. The composition exhibits substantially improved water retardant properties and provides improved thermal insulation and corrosion protection when it is packed around an underground structure.
The low density granular mineral materials are, in general, those minerals which contain from about 2% to about 6% combined water or occur naturally as an expanded lightweight material. When the rocks with the combined water are crushed and heated to above about 871.degree. C., the combined water vaporizes, thereby expanding the semi-molten rock to a volume many times its original volume. As a result, each granule consists of many vesicular internal pores which are primarily closed cells, although the external surface exhibits a certain percentage of open or broken pores due to its jagged countenance. While the true specific gravity of this inorganic granular mineral material is more than twice the specific gravity of water, the weight of a cubic foot volume of the expanded granular mineral material may be as low as two pounds due to its expanded size and the inclusion of a high percentage of internal pores. Therefore, as a result of the internal porosity within the low density granular mineral material, the bulk density of a bed of this material is generally from about three pounds per cubic foot to a maximum of sixty-five pounds per cubic foot with about five to about fifteen pounds per cubic foot being the preferred range for the bulk density of the granular mineral material. This bulk density requirement necessitates that the granular mineral material contain from about 50% to about 95% internal pore volume.
The low density granular mineral material is preferably selected from the group comprising expanded perlite, expanded vermiculite, expanded shale, and pumice stone which occurs naturally as an "expanded" lightweight mineral material. Other suitable low density granular mineral materials known to one skilled in the art may also be utilized in the practice of the present invention. Furthermore, combinations of two or more low density granular materials may also be utilized in the practice of the present invention.