Condensation polymers of sulfonated phenols, urea, other organic nitrogen-bases, and formaldehyde, and their use as tanning agents and as spraying aids for redispersible polymer powders

US5342916A · kind A · utility

Assignee

• BASF SE

Inventors

• Juergen Weiser · Schriesheim, DE
• Wolfgang Reuther · Neckargemünd, DE
• Karl Stork · Eisenberg (Pfalz), DE
• Ortwin Schaffer · Ludwigshafen, DE
• Gernot Franzmann · Worms, DE
• Thomas Schwerzel · Meckenheim, DE
• Maximilian Angel · Mutterstadt, DE
• Joachim Pakusch · Ludwigshafen, DE
• Brigitte Wegner · Speyer, DE

Key dates

• Filing date: May 28, 1992
• Grant date: Aug 30, 1994
• Expiry date: May 28, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C14C3/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Condensation polymers of sulfonated phenols, urea, other organic nitrogen-bases and formaldehyde, obtainable by PA1 (A) sulfonation of phenols with from 1.0 to 1.5 moles of sulfuric acid per mole of phenol and PA1 (B) condensation of these sulfonation products with PA2 (a) from 0.5 to 1.8 moles of urea per mole of phenol, PA2 (b) from 0.001 to 0.5 moles of at least one other organic nitrogen-base per mole of phenol, and PA2 (c) from 1.0 to 3.0 moles of formaldehyde per mole of phenol. The condensation polymers are suitable for use as tanning agents in the leather and skin-producing industry and as spraying aids for redispersible polymer powders.