Controlled time-release algae resistant roofing system

a technology of algae-resistant roofing and controlled time-release, which is applied in the direction of cellulosic plastic layered products, roads, traffic signals, etc., can solve the problems of severe discoloration of the entire roof, accelerate premature roofing failure, and buildup of hea

Inactive Publication Date: 2007-06-28
CERTAINTEED CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042]The algae-resistant granules prepared according to the process of the present invention can be employed in the manufacture of algae-resistant roofing products, such as algae-resistant asphalt shingles or roofing membranes. The algae-resistant granules of the present invention can be mixed with conventional roofing granules, and the granule mixture can be embedded in the surface of bituminous roofing products using conventional methods. Alternatively, th...

Problems solved by technology

In addition to being aesthetically unpleasant, the discoloration can lead to heat buildup and accelerate premature roofing failure.
Eventually, severe discoloration of the entire roof can occur.
However, frequent washing and cleaning with cleaning solutions is required, since the effective duration of such treatments is rathe...

Method used

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  • Controlled time-release algae resistant roofing system
  • Controlled time-release algae resistant roofing system
  • Controlled time-release algae resistant roofing system

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Encapsulated AR Granules

[0115]1,000 g of conventional cuprous oxide-loaded algae resistant (AR) roofing granules (Product Code GH 71 AR) manufactured at CertainTeed's Gads Hill roofing granule plant located at Piedmont, Mo. were used as the base particles. In this case, cuprous oxide acted as the first algaecidal material. These granules were in turn encapsulated with an outer coating. Composition of this outer coating consisted of 125 g of sodium silicate (40% solids, with Na2O:SiO2 ratio of 1:3.2; Occidental Chemical Corporation, Dallas, Tex.), 100 g of clay slurry (70% solids, Unimin Corporation, New Canaan, Conn.), 20 g of titanium oxide (TiPure Product Number R-101, DuPont, Wilmington, Del.) and 120 g of water. The outer coating was applied onto the roofing granules using a fluidized bed coater Model 2 supplied by Fluid Air, Inc. (Aurora, Ill.). The operating conditions were set at 24 scfm of inlet air flow rate, 70° C. of inlet temperature, 10 psi of spraying pr...

example 2

Preparation of Encapsulated AR Granules

[0116]The process of Example 1 was repeated, except the outer coating composition was modified. The composition consisted of 188 g of sodium silicate (40% solids, with Na2O:SiO2 ratio of 1:3.2; Occidental Chemical Corporation, Dallas, Tex.), 100 g of clay slurry (70% solids, Unimin Corporation, New Canaan, Conn.), 20 g of titanium oxide (TiPure Product Number R-101, DuPont, Wilmington, Del.), 12 g of zinc oxide (Zinc Corporation of America, Monaca, Pa.) and 150 g of water. The coated granules were fired in a gas-fired kiln at a temperature of 500° C. for 20 minutes to form a composite roofing granule having cuprous oxide in the interior fully encapsulated by an exterior layer of zinc oxide-loaded sodium silicate binder. In this case, the resultant composite granules have dual algaecides: cuprous oxide in the interior and zinc oxide on the outer layer.

example 3

Preparation of Encapsulated AR Granules

[0117]The process of Example 1 was repeated, except the outer coating composition was modified further. The composition consisted of 60 g of colloidal silica Ludox CL-X (45% solids, pH 9.1, Sigma-Aldrich Corporation, St. Louis, Mo.), 30 g of clay slurry (70% solids, Unimin Corporation, New Canaan, Conn.), 12 g of aluminum phosphate (Sigma-Aldrich Corporation, St. Louis, Mo.), 20 g of titanium oxide (TiPure R-101, DuPont, Wilmington, Del.), 18 g of zinc oxide (Zinc Corporation of America, Monaca, Pa.) and 135 g of water. The coated granules were fired in a gas-fired kiln at a temperature of 500° C. for 20 minutes to form a composite roofing granule having cuprous oxide on the interior fully encapsulated by an exterior layer of zinc oxide-loaded phosphate binder. In this case, the resultant composite granules have dual algaecides cuprous oxide in the interior and zinc oxide on the outer layer.

[0118]Leaching Procedure of Metal Ions from Roofing Gr...

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Abstract

Time-release algae-resistant roofing granules have a base particle including an algaecide and an outer coating layer including another algaecide. The at least two algaecides are released over different predetermined periods. The outer layer protects the base particle from exposure to the environment for a predetermined period, then fails catastrophically so that the interior algaecide can be released.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims the priority of U.S. Provisional Patent Application 60 / 597,903 filed Dec. 23, 2005.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to asphalt roofing shingles, protective granules for such shingles, and processes for making such granules and shingles.[0004]2. Brief Description of the Prior Art[0005]Pigment-coated mineral rocks are commonly used as color granules in roofing applications to provide aesthetic as well as protective functions to the asphalt shingles. Dark blotches or streaks sometimes appear on the surfaces of asphalt shingles, especially in warmer humid climates, because of the growth of algae and other microorganisms. The predominant species responsible is Gloeocapsa sp, a blue-green algae. Other microbial growth, including fungi, moss and lichen, can also occur under proper conditions, for example, in a shady and / or persistently damp environment. In...

Claims

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Application Information

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IPC IPC(8): E01F9/04B05D7/00
CPCA01N25/12Y10T428/2991A01N59/16A01N59/20C09D5/14E04D5/12E04D13/002E04D2001/005A01N25/26Y10T428/24372E04D1/00A01N2300/00Y10T428/2993Y10T428/2998Y10T428/31815C09C1/00
Inventor KALKANOGLU, HUSNU M.HONG, KEITH C.KIM, JOONG YOUNSHIAO, MING LIANG
Owner CERTAINTEED CORP
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