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US3888682A Expired / Lapsed US ⏱️ 0.0 years remaining

Algicidal post treated roofing granules

Assignee: ISP Investments LLC
•
Filing: 1972-10-25
•
Granted: 1975-06-10
•
Expires: 1992-10-25
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Abstract

Abstract Algicidal properties are imparted to conventional color coated roofing granules by incorporating metallic algicides with a heavy processing oil in the post-treatment of such color coated roofing granules. The metallic algicides employed have a particle size not exceeding about 100 mesh. A variety of metalic algicidal compounds can be employed, with copper algicides being particularly advantageous. The processing oil, having a viscosity of about 525-950 SUS measured at 100*F and present in an amount generally of about 1/4 to about 1 1/4 gallons per ton of base granules, forms a thin film on the surface of the coated granules, with a portion of said oil generally being absorbed into the color coating and possibly into the base granules themselves. The metallic algicides adhere to the surface of the granules color coating, with the finer particles thereof being adsorbed into the color coat with the processing oil. The heavy oil enhances the adherence of the algicides to the granule surface. By employing a mixture of copper and zinc algicides, a bimetallic toxic effect particularly effective in retarding the growth of algae and/or fungi is achieved.

Inventors

  • 👤 Arnold S Nelson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 14:36
CPC Classifications
A; A01; A01N; A01N25/00; A01N25/26

Claims Analysis

Total Claims: 31
Claim 1
Independent Claim 274 words
ALGICIDAL ROOFING GRNULES CAPABLE OF INHIBITING OR PREVENTING THE GROWTH OF DISCOLORING ALGAE AND FUNGI ORGANISMS UPON EXPOSURE OF ROOFING SURFACES CONTAINING SUCH GRANULES TO ATMOSPHERIC WEATHERING FOR EXTENDED PERIODS OF TIME, COMPRISING: A. BASE MINERAL GRANULES; B. A MOISTURE PERMEABLE, DURABLE, WATER INSOLUBILIZED, PIGMENTED, FIRED INORGANIC ALKALI METAL SILICATE-CLAY COATING ON SAID BASE GRANULES; C. A HEAVY PROCESSING OIL COMPOSITION PRESENT IN AN AMOUNT WITHIN THE RANGE OF FROM ABOUT 1/4 TO ABOUT 11/4 GALLONS PER TON OF BASE GRANULES, SAID PROCESSING OIL FORMING A THIN FILM ON THE SURFACE OF SAID COATED GRANULES, SAID PROCESSING OIL HAVING A VISCOSITY WITHIN THE RANGE OF FROM ABOUT 525 TO ABOUT 950 SUS, MEASURED TO 100*F; AND D. METALLIC ALGICIDES IN THE OIL FILM AND ADHERING TO THE SURFACE OF SAID GRANULE COATING, SAID ALGICIDES HAVING A PARTICLE SIZE NOT EXCEEDING ABOUT 100 MESH AND BEING PRESENT IN AMOUNTS WITHIN THE RANGE OF FROM ABOUT 0.05 TO ABOUT 1.0 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE BASE MINERAL GRANULES, METALLIC ALGICIDAL IONS BEING LEACHABLE FROM SAID ALGICIDES UPON EXPOSURE THEREOF TO MOISTURE DURING ATMOSPHERIC WEATHERING, WHEREBY THE WEATHERING AWAY OF SAID PROCESSING OIL UPON ATMOSPHERIC EXPOSURE OF ROOFING SURFACES INCORPORATING SAID GRANULES DOES NOT ADVERSELY AFFECT THE ENHANCED ADHERENCE OF MOISTURE DURING PERIODS OF RAIN AND DEW CAUSING IONIZATION OF MOISTURE DURING PERIODS OF RAIN AND DEW CAUSING IONIIZATION OF SAID METALLIC ALGICIDES WITH THE RESULTING METALLIC IONS BEING SLOWLY LEACHED FROM SAID GRANULES TO RETARD THE GROWTH OF ALGAE AND FUNGI. THUS ENHANCING THE RESISTANCE OF SAID ROOFING SURFACES CONTAINING SUCH GRANULES TO DISCOLORATION DURING EXTENDED PERIODS OF EXPOSURE TO ATMOSPHERIC WEATHERING.
Claim 2
Dependent Claim 274 words
ALGICIDAL ROOFING GRNULES CAPABLE OF INHIBITING OR PREVENTING THE GROWTH OF DISCOLORING ALGAE AND FUNGI ORGANISMS UPON EXPOSURE OF ROOFING SURFACES CONTAINING SUCH GRANULES TO ATMOSPHERIC WEATHERING FOR EXTENDED PERIODS OF TIME, COMPRISING: A. BASE MINERAL GRANULES; B. A MOISTURE PERMEABLE, DURABLE, WATER INSOLUBILIZED, PIGMENTED, FIRED INORGANIC ALKALI METAL SILICATE-CLAY COATING ON SAID BASE GRANULES; C. A HEAVY PROCESSING OIL COMPOSITION PRESENT IN AN AMOUNT WITHIN THE RANGE OF FROM ABOUT 1/4 TO ABOUT 11/4 GALLONS PER TON OF BASE GRANULES, SAID PROCESSING OIL FORMING A THIN FILM ON THE SURFACE OF SAID COATED GRANULES, SAID PROCESSING OIL HAVING A VISCOSITY WITHIN THE RANGE OF FROM ABOUT 525 TO ABOUT 950 SUS, MEASURED TO 100*F; AND D. METALLIC ALGICIDES IN THE OIL FILM AND ADHERING TO THE SURFACE OF SAID GRANULE COATING, SAID ALGICIDES HAVING A PARTICLE SIZE NOT EXCEEDING ABOUT 100 MESH AND BEING PRESENT IN AMOUNTS WITHIN THE RANGE OF FROM ABOUT 0.05 TO ABOUT 1.0 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE BASE MINERAL GRANULES, METALLIC ALGICIDAL IONS BEING LEACHABLE FROM SAID ALGICIDES UPON EXPOSURE THEREOF TO MOISTURE DURING ATMOSPHERIC WEATHERING, WHEREBY THE WEATHERING AWAY OF SAID PROCESSING OIL UPON ATMOSPHERIC EXPOSURE OF ROOFING SURFACES INCORPORATING SAID GRANULES DOES NOT ADVERSELY AFFECT THE ENHANCED ADHERENCE OF MOISTURE DURING PERIODS OF RAIN AND DEW CAUSING IONIZATION OF MOISTURE DURING PERIODS OF RAIN AND DEW CAUSING IONIIZATION OF SAID METALLIC ALGICIDES WITH THE RESULTING METALLIC IONS BEING SLOWLY LEACHED FROM SAID GRANULES TO RETARD THE GROWTH OF ALGAE AND FUNGI. THUS ENHANCING THE RESISTANCE OF SAID ROOFING SURFACES CONTAINING SUCH GRANULES TO DISCOLORATION DURING EXTENDED PERIODS OF EXPOSURE TO ATMOSPHERIC WEATHERING.
Claim 3
Dependent Claim 21 words
The algicidal roofing granules of claim 1 in which said algicides have a particle size of less than about 200 mesh.
Claim 4
Dependent Claim 25 words
The algicidal roofing granules of claim 2 in which said algicides have a particle size the major proportion of which is less than 325 mesh.
Claim 5
Dependent Claim 59 words
The algicidal roofing granules of claim 3 in which a portion of said processing oil is absorbed into the coating on said base granules, said heavy processing oil composition containing a silicone composition in an Amount within the range of from about 1 to about 25 percent by weight based on the total weight of said processing oil composition.
Claim 6
Dependent Claim 21 words
The algicidal roofing granules of claim 4 in which a portion of said processing oil is absorbed into said base granules.
Claim 7
Dependent Claim 26 words
The algicidal roofing granules of claim 4 in which said algicides have a particle size at least about 99 percent of which is minus 325 mesh.
Claim 8
Dependent Claim 28 words
The algicidal roofing granules of claim 6 in which said metallic algicides have a particle size generally within the range of from about 44 to about 20 microns.
Claim 9
Dependent Claim 33 words
The algicidal roofing granules of claim 4 in which said processing oil is present in an amount within the range of from about 1/2 to about 3/4 gallon per ton of base granules.
Claim 10
Dependent Claim 33 words
The algicidal roofing granules of claim 8 in which said processing oil is present in an amount within the range of from about 0.6 to about 0.7 gallon per ton of base granules.
Claim 11
Dependent Claim 23 words
The algicidal roofing granules of claim 3 in which said processing oil has a viscosity of from about 600 to about 800 SUS.
Claim 12
Dependent Claim 23 words
The algicidal roofing granules of claim 10 in which said processing oil has a viscosity of from about 700 to about 750 SUS.
Claim 13
Dependent Claim 16 words
The algicidal roofing granules of claim 3 in which said metallic algicide comprises a cadmium algicide.
Claim 14
Dependent Claim 16 words
The algicidal roofing granules of claim 3 in which said metallic algicide comprises a nickel algicide.
Claim 15
Dependent Claim 16 words
The algicidal roofing granules of claim 3 in which said metallic algicide comprises a silver algicide.
Claim 16
Dependent Claim 16 words
The algicidal roofing granules of claim 3 in which said metallic algicide comprises a copper algicide.
Claim 17
Dependent Claim 15 words
The algicidal roofing granules of claim 3 in which said algicide comprises a zinc algicide.
Claim 18
Dependent Claim 20 words
The algicidal roofing granules of claim 3 in which said metallic algicide comprises a mixture of copper and zinc algicides.
Claim 19
Dependent Claim 14 words
The algicidal roofing granules of claim 15 in which said copper algicide comprises Cu2O.
Claim 20
Dependent Claim 15 words
The algicidal roofing granules of claim 15 in which said copper algicide comprises copper sulfate.
Claim 21
Dependent Claim 14 words
The algicidal roofing granules of claim 16 in which said zinc algicide comprises ZnO.
Claim 22
Dependent Claim 20 words
The algicidal roofing granules of claim 17 in which said zinc algicide comprises ZnO and said copper algicide comprises Cu2O.
Claim 23
Dependent Claim 26 words
The algicidal roofing granules of claim 17 in which said zinc algicide comprises ZnO and said copper algicide comprises a mixture of Cu2O and copper sulfate.
Claim 24
Dependent Claim 39 words
The algicidal roofing granules of claim 15 in which said copper algicide is present in an amount within the range of from about 0.1 to about 1.0 percent by weight based on the total weight of said base granules.
Claim 25
Dependent Claim 33 words
The algicidal roofing granules of claim 16 in which said zine algicide is present in an amount of at least about 0.75 percent by weight based on the weight of said base granules.
Claim 26
Dependent Claim 42 words
The algicidal roofing granules of claim 17 in which said copper and zinc algicides are both present in an amount within the range of from about 0.05 to about 0.5 percent by weight based on the total weight of said base granules.
Claim 27
Dependent Claim 37 words
The algicidal roofing granules of claim 18 in which said Cu2O is present in an amount within the range of from about 0.1 to about 1.0 percent weight based on the total weight of said base granules.
Claim 28
Dependent Claim 32 words
The algicidal roofing granules of claim 20 in which said ZnO is present in an amount of at least about 0.75 percent by weight based on the weight of said base granules.
Claim 29
Dependent Claim 26 words
The algicidal roofing granules of claim 6 in which a portion of said metallic algicides is adsorbed into the silicate-clay coating on said base mineral granules.
Claim 30
Dependent Claim 25 words
The algicidal roofing granules of claim 25 in which a portion of said metallic algicides is present in said silicate-clay coating on said base granules.
Claim 31
Dependent Claim 27 words
The algicidal roofing granules of claim 29 in wHich said metallic algicides have a particle size at least about 99 percent of which is minus 325 mesh.

References Cited (Backward Citations)

US1970471A Cited
US2003849A Cited
US2078359A Cited
US2362489A Cited
US2614051A Cited
US3208871A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-06-09 1978-12-09 1979-06-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-06-09 1982-12-09 1983-06-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-06-09 1986-12-09 1987-06-10 $7700.00 Window Closed / Lapsed

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