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TOPIC: Alkali metal silicate-zinc hydroxychloride Tile And Shingle Roof Coating Composition

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Date: Jun 17, 2008

Alkali metal silicate-zinc hydroxychloride Tile And Shingle Roof Coating Composition

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�James R. Lodge

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Abstract | Description | Claims

Abstract
An aqueous, alkaline, inorganic composition, comprising water-soluble alkali metal silicate and zinc hydroxychloride, is used to coat substrates normally infested by algae, such as silicate-containing building material, e.g., concrete roofing tiles, to prevent or minimize algal infestation on said substrates, said algae otherwise imparting a dark, unsightly appearance thereto.

Patent number: 3998644
Filing date: Oct 28, 1975
Issue date: Dec 21, 1976
Inventor: James R. Lodge
Assignee: Minnesota Mining and Manufacturing Company

U.S. Classification
106/15R; 106/74; 106/84; 106/105; 106/287S

International Classification
C09D 514

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Citations

Patent Number	Title	Issue date
1321429	PLASTIC MATERIAL	Nov 1919
1923769	REFRACTORY MATERIAL FOR USE IN METAL CASTING	Aug 1933
2091991	GRANULATED MATERIAL ANB PKOCESS OF X M MAKING THE SAME	Sep 1937
2310128	OXTCHLOBIDE COATING	Feb 1943
2769716	FUNGISTATIC PIGMENT AND COATING COMPOSITION	Nov 1956
2952553	METHOD FOR FORMING A METAL CASTING MOLD	Sep 1960
3507676	ZINC CONTAINING ALGICIDAL	Apr 1970

Referenced by

Patent Number	Title	Issue date
5366767	Composition and method for preventing moss growth on roofs	Nov 22, 1994
5411803	Granular materials having an improved ceramic coating, methods of preparing same, and composite sheets including same	May 2, 1995
5589229	Composition and method for preventing moss growth on roofs	Dec 31, 1996
6214466	Algae-resistant roofing granules	Apr 10, 2001
6277346	Photocatalyst composite and process for producing the same	Aug 21, 2001
6498000	Photocatalyst composite and process for producing the same	Dec 24, 2002
6838152	Low pigments costs algae-retardant roofing granule products containing metallic copper	Jan 4, 2005

Claims

What is claimed is:

1. An inorganic coating composition comprising about 55 to 70 weight percent water, a water-soluble alkali metal silicate, and zinc hydroxychloride of the formula Zn.sub.5 (OH).sub.8 Cl.sub.2, in an amount of at least 0.5 mole for each mole of said alkali metal silicate, said composition upon being applied as a coating and dried at ambient temperatures of about 60.degree. to 100.degree. F. forming a hard, durable, water-insoluble, water-permeable, weather-resistant, inorganic, algicidal coating.

2. An inorganic coating composition comprising about 55 to 70 weight percent water, a water-soluble sodium silicate having an Na.sub.2 O:SiO.sub.2 weight ratio of 1:2.75 to 1:3.75 and zinc hydroxychloride of the formula Zn.sub.5 (OH).sub.8 Cl.sub.2.H.sub.2 O in an amount of about 0.5 to 1.0 mole for each mole of said sodium silicate, said composition upon being applied as a coating and dried at ambient temperature of 60.degree. to 100.degree. F. forming a hard, durable, water-insoluble, water-permeable, weather-resistant, inorganic, algicidal coating.

3. A coating composition containing about 55 to 70 weight percent water, sodium silicate and about 0.8 to 1 mole of zinc hydroxychloride per mole of sodium silicate, said composition being formed by mixing an aqueous inorganic solution containing 25 to 35 weight percent water-soluble sodium silicate, having an Na.sub.2 O:SiO.sub.2 weight ratio of 1:2.75 to 1:3.75, with an aqueous paste comprising 35 to 55 weight percent zinc hydroxychloride, of the formula Zn.sub.5 (OH).sub.8 Cl.sub.2.H.sub.2 O, said composition upon being applied as a coating and dried at ambient temperature of 60.degree. to 100.degree. F. forming a hard, durable, water-insoluble, water-permeable, weather-resistant, inorganic, algicidal coating.

4. An inorganic coating composition comprising about 55 to 70 weight percent water, a water-soluble sodium silicate having an NaO.sub.2 :SiO.sub.2 weight ratio of 1:3.22 and zinc hydroxychloride of the formula Zn.sub.5 (OH).sub.8 Cl.sub.2.H.sub.2 O in an amount of about 0.5 to 1.0 mole for each mole of said sodium silicate, said composition upon being applied as a coating and dried at an ambient temperature of 60.degree. to 100.degree. F. forming a hard, durable, water-insoluble, water-permeable, weather-resistant, inorganic, algicidal coating.

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