Layered silicates of limited swelling power, a process for their production and their use in detergents and cleaning preparations

US4737306A · kind A · utility

Assignee

• Kenkel Kommanditgeselschaft auf Aktien · DE

Inventors

• Winfried Wichelhaus · Mettmann, DE
• Wolfgang von Rybinski · Goldkronach, DE
• Horst Upadek · Erkrath, DE

Key dates

• Filing date: Jul 8, 1986
• Grant date: Apr 12, 1988
• Expiry date: Jul 8, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/1253
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention provides synthetic, finely divided water-insoluble layered silicates having a smectite-like crystal phase, with increased contents of bound alkali and silicate and a distinctly reduced swelling power in aqueous suspension relative to pure layered silicates of this type. The synthetic layered silicate of this invention has the following oxide summation formula EQU MgO.aM.sub.2 O.bAl.sub.2 O.sub.3.cSiO.sub.2.nH.sub.2 O wherein M is selected from the group consisting of sodium and a mixture of sodium and lithium said mixture having a molar ratio of sodium to lithium of at least about 2, PA1 n represents the number of water molecules bound in the crystal phase, and PA1 a, b, c and n each represent a number having a value within the following ranges: PA2 a is from about 0.05 to about 0.4 PA2 b is from 0 to about 0.3 PA2 c is from about 1.2 to about 2.0, and PA2 n is from about 0.3 to about 3.0.