Title (en)

PROCESS FOR TANNING LEATHER

Publication

EP 0265657 B1 19901017 (DE)

Application

EP 87113669 A 19870918

Priority

• DE 3632638 A 19860925
• DE 3711458 A 19870404

Abstract (en)

[origin: US4810252A] Use of a resin mixture of, or of a mixed resin from, a melamine-formaldehyde resin and an anionically modified melamine-formaldehyde resin for tanning leather. The anionic modification of the melamine-formaldehyde resin is obtained by preparing the resin in the presence of alkali metal sulfite, alkali metal hydrogensulfite or alkali metal sulfamate. By partial modification it is possible to obtain a mixed resin, while mixing a modified with an unmodified resin gives a resin mixture.

IPC 1-7

C14C 3/18; C14C 3/20

IPC 8 full level

C14C 3/18 (2006.01); C14C 3/20 (2006.01)

CPC (source: EP KR US)

C14C 3/16 (2013.01 - KR); C14C 3/18 (2013.01 - EP US)

Designated contracting state (EPC)

AT BE CH DE ES FR GB IT LI NL

DOCDB simple family (publication)

EP 0265657 A1 19880504; EP 0265657 B1 19901017; BR 8704915 A 19880517; DE 3765616 D1 19901122; ES 2018807 B3 19910516; KR 880004101 A 19880601; PT 85776 A 19871001; PT 85776 B 19900731; US 4810252 A 19890307

DOCDB simple family (application)

EP 87113669 A 19870918; BR 8704915 A 19870924; DE 3765616 T 19870918; ES 87113669 T 19870918; KR 870010644 A 19870925; PT 8577687 A 19870923; US 10425287 A 19871005