Amino resin solutions having low electrical conductivity

US5047466A · kind A · utility

Assignee

• BASF SE

Inventors

• Gerd Busse · Mutterstadt, DE
• Jakob Decher · Frankenthal (Pfalz), DE
• Wolfgang Eisele
• Edgar Haeussler · Haßloch, DE
• Otto Wittmann · Bischofswerda, DE

Key dates

• Filing date: Feb 8, 1990
• Grant date: Sep 10, 1991
• Expiry date: Feb 8, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L61/32
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Amino resin solutions having an electrical conductivity of <100 .mu.S/cm for impregnating paper are obtainable by PA0 A) methylolation of melamine with aqueous formaldehyde in a molar ratio of from 1:2 to 1:5 in the presence of a tertiary organic amine at a pH of from 7 to 12, PA0 B) etherification with a molar excess, based on the methylol groups, of a C.sub.1 -C.sub.4 -alcohol in the presence of an unsubstituted or substituted dicarboxylic acid and/or polycarboxylic acid at a pH of from 3 to 6, PA0 C) neutralization of the reaction mixture with an inorganic base and removal of the volatile components by distillation, except for a water content of <10% by weight, based on the reaction mixture, and PA0 D) addition of a C.sub.1 -C.sub.4 -alcohol to give a solids content of from 40 to 90% by weight, based on the amino resin solution, and removal of insoluble components by filtration.