Detergent tablets of uniform composition for dishwashing machines

US4839078A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Hans-Friedrich Kruse · Korschenbroich, DE
• Jochen Jacobs · Wuppertal, DE
• Theodor Altenschoepfer · Goldkronach, DE
• Peter Jeschke · Eltville am Rhein, DE

Key dates

• Filing date: Nov 17, 1986
• Grant date: Jun 13, 1989
• Expiry date: Nov 17, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/3955
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Tablets having a broad solubility profile containing a mixture of sodium metasilicate nonahydrate and anhydrous sodium metasilicate with a grain size of from 0.2 to 0.8 mm in a ratio by weight of from 1:0.75 to 1:1.2, anhydrous pentasodium triphosphate having a grain diameter of 0.2 to 0.3 mm, and 0.5 to 5% by weight of an active chlorine donor. The ratio by weight of pentasodium triphosphate to metasilicates is about 1:1 to 1:1.7, based on anhydrous substances. The tablets are used in automatic dishwashing machines where they are introduced into a free zone of the machine before the start of the prerinse cycle, at least 10% of the tablets being dissolved by inflowing cold water and at least another 70% being available in the main-wash cycle.