Patent · US Expired

Preparation of water-soluble or self-dispersing resin tanning agents

US4403993A · kind A · utility

4Cited by

4References

10Claims

0Family size

Assignee

BASF SE

Inventors

Dietrich Lach
Rolf Streicher · Worms, DE
Gerhard Bolz · Memmingen, DE

Key dates

Filing date	Apr 9, 1982
Grant date	Sep 13, 1983
Priority date	—
Expiry date	Apr 9, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC14C3/28
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Water-soluble or self-dispersing resin tanning agents are prepared by heating from 5 to 30% by weight of melamine, from 15 to 45% by weight of urea, from 20 to 35% by weight (calculated as anhydrous material) of formaldehyde and from 15 to 55% by weight of sodium bisulfite or of a corresponding amount of some other salt of sulfurous acid for from two to twelve hours in aqueous solution at 40.degree.-120.degree. C. and a pH of from 5 to 9.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.