Preparation of water-soluble condensates and their use as crosslinking agents for the preparation of papermaking aids

US4328142A · kind A · utility

Assignee

• BASF SE

Inventors

• Otto Hertel · Ludwigshafen, DE
• Emil Scharf · Ludwigshafen, DE
• Jaroslav Melzer · Ludwigshafen, DE

Key dates

• Filing date: Jan 15, 1981
• Grant date: May 4, 1982
• Expiry date: Jan 15, 2001

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21H21/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for the preparation of water-soluble polymeric crosslinking agents by a two-stage reaction of di-secondary diamines with epichlorohydrin and/or dichlorohydrin, wherein, in the first stage, di-secondary diamines are condensed with epichlorohydrin and/or dichlorohydrin in a molar ratio of from 1:0.5 to 1:1 at a pH of from 9 to 12, and in the second stage the condensates obtained in the first stage are reacted with additional epichlorohydrin and/or dichlorohydrin at a pH of from 4 to 8.5. The water-soluble condensates thus obtained are crosslinking agents for polyamines, polyamidoamines, ethyleneimine-modified polyamidoamines and polyether-amines. The crosslinking reaction gives water-soluble condensates, which possess a high cation activity and may be used as retention aids, drainage aids and flocculants in the manufacture of paper.