Silicone foam control agent

US6521586B1 · kind B1 · utility

Assignee

• Dow Corning S.A. · BE

Inventors

• Jan Hoogland · Grants Pass, US
• Anick Colson · Champion, BE
• Franck A. D. Renauld · Chaumont-Gistoux, BE
• Jacqueline L'Hostis · Hellebecq, BE
• George C. Sawicki · Penarth, GB
• Sophie Stassen · Sint-Genesius-Rode, BE

Key dates

• Filing date: Aug 11, 2000
• Grant date: Feb 18, 2003
• Expiry date: Nov 22, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C11D3/162
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A foam control agent comprises (A) an organopolysiloxane material having at least one silicon-bonded substituent of the formula X—Ph, wherein X denotes a divalent aliphatic hydrocarbon group and Ph denotes an optionally substituted aromatic group, (B) an organosilicon resin and (C) a hydrophobic filler. The organosilicon resin (B) preferably consists of siloxane units of the formula R′aSiO4−a/2 wherein R′ denotes a hydroxyl, hydrocarbon or hydrocarbonoxy group, particularly trialkylsiloxy units and SiO4/2 units, wherein a has a value of from 0.5 to 2.4. The foam control agent may be provided as an emulsion or as a particulate material. It is especially useful as a detergent foam control agent.