N is white, readily water soluble powder. It consists
of a slat mixture which hardly yields and hydroxyl ions
but reacts almost neutral in aqueous solution. The
salts contain strongly complex-active acid radicals
which displace and buffer the sulphuric acid bound in
the collagen – chromium complexes.
neutralization with its well-known adverse effects for
the leather quality is impossible with Jktan N.
Excessive amounts will even improve the leather quality
by conversion of any unfixed chromium salts into tanning
complexes. Thus, in neutralizing with Jktan N, the
leathers need, if any, only a light rinsing, and this
alone is an advantage, all the more so since chrome
tanning agent is also saved in this way. In contrast to
neutralizing agents with alkaline reaction, Jktan N
causes no precipitation in chrome liquors, so that
formation of undesirable chrome stains is unlikely.
Jktan N lowers the positive charge of the collagen –
chromium complexes and thus levels out the pronouncedly
positive charge of the chrome leather surface. This is
beneficial for applying anionic dyes and fatliquors,
because very uniformly dyed and fatliquored leathers are
Vegetable and synthetic retannages have a mild and
uniform effect after a preceding Jktan N neutralization;
drawn grain and overtannage are avoided and a full
leather with fine and tight grain and exceptionally good
dyeing properties is obtained.
The properties of the product described above are
particularly beneficial, if the soda bi carb, normally
used, is replaced wholly or atleast partially by Jktan N
already in basification of the chrome liquor.
The product can also be used in combination with other
commonly used neutralizing agents, e.g. sodium
bicarbonate. In such cases, neutralization is commenced
with Jktan N and the other neutralizing agent is added