De-foamer and processes for its production

US4696761A · kind A · utility

Assignee

• BYK-CHEMIE GMBH · DE

Inventors

• Karlheinz Haubennestel · Wesel, DE
• Daniela Breil · Hamminkeln, DE
• Alfred Bubat · Xanten, DE
• Werner Spratte · Witten, DE

Key dates

• Filing date: May 2, 1986
• Grant date: Sep 29, 1987
• Expiry date: May 2, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D19/0413
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

To produce a de-foamer, mono- and/or poly-functional isocyanate is reacted with mono- and/or polyfunctional amines, preferably in equivalent ratio 0.5:1 up to 1:0.2, in an organic carrier media, to form urea sols at temperatures which lie below the melting temperature of the resulting urea, the organic carrier medium not being a true solvent for the urea. The prepared ureas are represented by the general Formula 1: ##STR1## wherein r=C.sub.4 -C.sub.30 -alkyl; R'=C2-C.sub.12 -alkylene, phenylene or naphthalene with or without substitution by one or more C.sub.1 -C.sub.9 -alkyl groups, or cycloalkylene; R'--H or CH.sub.3 ; R"--H or methyl; and x=0 to 1, and are prepared by reacting isocyanates with amines in organic carrier media to form ureas of Formula 1, at temperatures lying below the melting temperature of the resulting urea, the organic carrier media not being true solvents for the urea.