Loading patent…
AssigneeHoechst Aktiengesellschaft
InventorsErich Feess, Hartmut Springer, Willy Gronen
Estimating the term…
A process for the fixation of organic dyestuffs on materials having a fibrous structure had been found, in which an organic dyestuff containing one or several groups of the formula (I) ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a non-ionic, anionic or cationic substituent, with the exception of a primary or secondary amino group or the salts thereof, is applied in dissolved form onto said materials and subsequently subjected to the action of nitrous acid. The process yields fiber materials on which active substances, such as dyestuffs, brighteners, mothproofing agents, water-repellent agents, etc., are fixed fast; the novel process is especially and advantageously suitable in combination with the ice-color technique.
A process for the fixation of an organic dyestuff on materials having a fibrous structure, which comprises applying an organic dyestuff containing one or several groups of the formula (I) ##STR53## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each represent a non-ionic, anionic or cationic substituent, with the exception of a primary or secondary amino group or the salts thereof, in dissolved form onto said materials and subsequently subjecting it to the action of nitrous acid.
Dependencies are inferred from the claim text.