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US 7,741,236 B2Granted
Water-soluble glass composition
AssigneeReckitt Benckiser N.V.
InventorsKarlheinz Ulrich Gerhard Hahn, Karin Werner
Life of this patent
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Abstract
A zinc and bismuth containing, water-soluble glass composition comprising from 10 to 75 mole % P2O5, 5-50 mole % alkali metal oxide, up to 40 mole % ZnO and up to 40 mole % Bi2O3.
Claims15
A water-soluble glass composition in the form of a solid body comprising 10 to 75 mole % P2O5,
- over 20 to 50 mole % alkali metal oxide,
- up to 40 mole % ZnO and,
- up to 40 mole % Bi2O3, the mole ratio of zinc to bismuth in the composition is in the range from 1:25 to 25:1 and wherein the composition is at least partially soluble in water and releases zinc and bismuth during a dishwashing cycle in an amount enough to ensure glassware corrosion protection without soiling the glassware.
A composition comprising:
- from 41 to 54 mole % of P2O5,
- from 20 to 30 mole % of alkali oxides,
- up to 5 mole % of SO3, from 15 to 25 mole % of ZnO,
- from 0.2 to 1.5 mole % Bi2O3,
- less than 3 mole % of alkaline-earth oxides, and,
- from 0.3 to 3 mole % of oxides of elements selected from the group consisting of silicon, aluminium and boron, and wherein the composition is at least partially soluble in water and releases zinc and bismuth during a dishwashing cycle in an amount enough to ensure glassware corrosion protection without soiling the glassware.
3 more elements
Dependencies are inferred from the claim text.