Composition for use in water reservoir

US6806244B1 · kind B1 · utility

Assignee

• Reckitt Benckiser LLC · US

Inventors

• Guido Waschenbach · Uetersen, DE
• Ralf Wiedemann · Mira, IT
• Enric Carbonell · Barcelona, ES
• Edgar Endlein · Wrestedt, DE
• Karl-Ludwig Gibis · Schifferstadt, DE

Key dates

• Filing date: Apr 18, 2001
• Grant date: Oct 19, 2004
• Expiry date: Apr 18, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D17/0078
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Composition for use in a water tank in the kitchen or sanitary sector, characterized by a basic composition essentially evolving its function following addition to a first water filling of the water tank, in the form of a tablet and at least one particle, with at least one core, which comprises at least one substance evolving its function essentially following an at least partial emptying of the first water filling from the water tank and the inflow of fresh water and a covering substantially completely surrounding the core or cores comprising at least one compound, whose solubility increases with decreasing concentration of a specific ion in the surrounding medium, the at least one particle being so arranged in or on the tablet that the surface of the particle or particles is at most only partly in direct contact with the surface of the basic composition surrounding the same and the concentration of the specific ion in the local environment of the particle or particles is sufficiently high up to a substantially complete dissolving of the tablet in order to prevent a substantial dissolving of the covering or a substantial detachment of the covering from the core or cores.