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Ceramic glaze having antimicrobial property

a ceramic glaze and antimicrobial technology, applied in the field of ceramic glazes, can solve the problems of scum and film of biologic origin in ceramic products, limited existing technology, and high temperature used in ceramic firing processes that preclude the use of organic antimicrobial agents

Inactive Publication Date: 2009-04-23
MICROBAN PROD CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When used to collect, contain and / or transport water, ceramic products often become stained by scum and films of biologic origin (e.g., bacteria, fungus, mold, mildew).
However, existing technologies are somewhat limited in this regard.
For example, the high temperatures used in ceramic firing processes typically preclude the use of organic antimicrobial agents.
Conventional inorganic silver-based antibacterial compounds (e.g., zeolite, amorphous glass, sol-gel) generally are too expensive for commercial use.
Moreover, incorporation of silver-based antimicrobial agents into ceramic glazes routinely presents issues of clouding, crazing, discoloration, and other undesirable consequences to the glaze aesthetics.
However, known ceramic glazing compositions that rely solely upon zinc oxide as an antimicrobial agent have not shown antimicrobial efficacy sufficient for control of microbial growth and proliferation on ceramic surfaces.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0056]In a first example, 2% Ag2CO3 was utilized as a first antimicrobial agent in a family of glaze compositions, which further contained a second antimicrobial agent: one of Bi2O3, CuO, SnO2, TiO2 or ZnO. The second antimicrobial agent was tested at both 2% and 4%. Sample tiles were glazed and the tiles were evaluated according to the above-described modified JIS Z2801:2000 test protocol for the effect of the glazed tile on bacterial reduction. Results are shown in TABLE 1.

example 2

[0057]In a second example, 2% Bi2O3 was utilized as a first antimicrobial agent in a family of glaze compositions, which further contained a second antimicrobial agent: one of Ag2CO3, CuO, SnO2, TiO2 or ZnO. The second antimicrobial agent was tested at both 2% and 4%. Sample tiles were glazed and the tiles were evaluated according to the above-described modified JIS Z2801:2000 test protocol for the effect of the glazed tile on bacterial reduction. Results are shown in TABLE 2.

TABLE 1Antimicrobial Combination: Ag2CO3K. PneumoniaeAg2CO3Bi2O3CuOSnO2TiO2ZnOLog reduction——————NA2%—————2.42%2%————3.62%4%————3.02%—2%———3.92%—4%———3.82%——2%——3.22%——4%——1.92%———2%—2.42%———4%—2.72%————2%3.02%————4%3.3

example 3

[0058]In a third example, 2% CuO was utilized as a first antimicrobial agent in a family of glaze compositions, which further contained a second antimicrobial agent: one of Ag2CO3, Bi2O3, SnO2, TiO2 or ZnO. The second antimicrobial agent was tested at both 2% and 4%. Sample tiles were glazed and the tiles were evaluated according to the above-described modified JIS Z2801:2000 test protocol for the effect of the glazed tile on bacterial reduction. Results are shown in TABLE 3.

TABLE 2Antimicrobial Combination: Bi2O3K. PneumoniaeBi2O3Ag2CO3CuOSnO2TiO2ZnOLog reduction——————NA2%—————0.82%2%————1.32%4%————3.72%—2%———1.92%—4%———3.12%——2%——0.52%——4%——0.92%———2%—−0.22%———4%—0.82%————2%0.72%————4%1.4

TABLE 3Antimicrobial Combination: CuOK. PneumoniaeCuOAg2CO3Bi2O3SnO2TiO2ZnOLog reduction——————NA2%—————0.42%2%————3.82%4%————4.02%—2%———2.52%—4%———1.92%——2%——0.32%——4%——2.42%———2%—2.02%———4%—2.32%————2%0.52%————4%3.0

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Abstract

An antimicrobial ceramic glazing composition contains one or more antimicrobial agents disposed therein. Methods for making and using the glazing composition are disclosed, as well as substrates having a fired antimicrobial glaze thereon. The antimicrobial agents comprise metallic oxides, with a subset of the disclosed combinations exhibiting synergistic effect in fired glazes.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. Ser. No. 60 / 890,666 and U.S. Ser. No. 60 / 890,673, each filed on Feb. 20, 2007, the contents of which are incorporated by reference as though fully set forth herein.FIELD OF THE INVENTION[0002]The present invention relates to the field of antimicrobial protection in a ceramic article or component thereof. More specifically, the present invention relates to a composition for imparting built-in and long lasting antimicrobial characteristics to ceramic products.BACKGROUND OF THE INVENTION[0003]An area of particular commercial interest in the art is ceramic articles and ceramic coatings. Ceramic coatings are commonly used in products that store, treat, or transport water and liquid waste. Ceramic toilets, urinals, bidets, bathroom basins (collectively known as sanitary ware), flooring tiles and other bathroom fixtures are probably the most common example of such products.[0004]When used to collect, cont...

Claims

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Application Information

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IPC IPC(8): C09D5/14B32B9/04B05D3/02
CPCA01N59/16A61K33/30A61K33/245A01N59/02C03C2204/02C04B41/5049C04B41/505A01N59/20C03C8/20C04B41/91C03C2209/00C04B41/0072C04B41/5027C04B33/34C04B41/86C04B41/009C04B41/5022A61K33/38A01N25/08A01N25/34C03C8/14C04B41/5041C04B33/00C04B41/4539C04B2103/0015C04B2103/0021C04B2103/67C04B2103/0016C04B2103/0022C04B2103/0025A01N2300/00C04B2237/32
Inventor CAMPBELL, JR., ALVIN LAMAR
Owner MICROBAN PROD CO INC
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