High productivity ceramic glaze
AssigneeHercules Incorporated
InventorsDieter Schweizer, Claudia Sorg
Life of this patent
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Abstract
A sanitary ceramic glaze with improved drying and leveling properties contains a thickening amount of a hydrophobically modified hydroxyethylcellulose with a M.S. of 1.5 to 4.5 and a weight percent hydrophobic modification between 0.1 and 2.0.
Claims7
A ceramic glaze comprising 20 to 60% by weight of water, 40 to 80% by weight of ceramic raw materials selected from the group consisting of feldspars, clays, kaolin, quartz, metal oxides, and frits and a thickening amount of a hydrophobically modified cellulose ether having a weight percent hydrophobic modification between 0.1 and 2.0.
A process for glazing sanitary ceramic articles selected from the group consisting of toilets, sinks and bathtubs comprising the steps
- a. spraying an unglazed ceramic article with an aqueous glaze of (i) 40 to 80% by weight of ceramic raw materials selected from the group consisting of feldspars, clays, kaolin, quartz, metal oxides, and frits, (ii) a thickening amount of a hydrophobically modified hydroxyethylcellulose, and (iii) optional sodium polyphosphate,
- b. drying until the article can be handled without marring the surface glaze, and
- c. firing to produce a glazed sanitary ceramic article.
Dependencies are inferred from the claim text.