Multilayer detergent tablets for dishwashing machines

US4828749A · 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: May 9, 1989
• Expiry date: Nov 17, 2006

Classification

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

Abstract

A multilayer detergent tablet for dishwashing machines based on alkali metal metasilicates, pentaalkali metal triphosphates, active chlorine compound, and surfactant. The tablet comprises a first cold water-soluble layer of alkali metal metasilicate nonahydrate, pentaalkali metal triphosphate, and a low-foaming nonionic surfactant; and a second layer which dissolves rapidly at increasing water temperatures comprising alkali metal metasilicate, pentaalkali metal triphosphate, and an active chlorine compound.