Water-repellent treatment of leather
Increasing the interfacial tension between leather fibres and water and
thus reducing or almost completely eliminating the wettability with water
by depositing water-repellents in the leather substance.
Hydrophobic = water-repellent
Oleophobic = oil- and dirt-repellent
The main water-repellents (general)
Chemical substances Mode of action
Water-insoluble fats, resins, Deposition, clogging the interfibrillar
waxes, polymers, etc. spaces. Mainly statical action.
Chrome fatty acid complexes, Fixation of the water-repellent
perfluorinated chrome fatty acid complex to the fibre.
complexes, chrome and aluminium Increasing the surface tension
alkylphosphates, etc. against water.
Compounds with free carboxylic Formation of a water-repellent
groups and complexing emulsi- complex on the fibre.
fiers, e. g. fatty acids and esters, Increasing the surface tension
soaps, dicarboxylic acids, esters against water.
of phosphoric acid, polymeric fatty
acids, imido acetic acid derivatives.
Polysiloxanes, carbon fluoride Surrounding the fibre with a
resins, etc. water-repellent film. Increasing the
surface tension against water.
Hydrophilic emulsifiers of the Clogging the interfibrillar spaces
water-in-oil type, e. g., alkylated by water absorption and
and alkylized derivatives of formation of emulsion and
succinic acid, derivates of citric swelling.
acid, esters of fatty acids of
polyvalent alcohols, hydroxy-
ethylated fatty acids or alcohols.
Nitrogen-containing compounds, Blocking the phenolic groups
e. g., pyridinium chloride derivatives, of tanning agents. Increasing the
alkylene derivatives, isocyanates. surface tension against water.
All BASF water-repellents mentioned below are light fast and heat resis-
tant. They do not contain organic solvents or organic halogen com-
pounds, and so do not make any contribution to the AOX content of the
The water-repellent effect can be generally improved by fixation with
Densodrin CD Anionic water repellent for leathers that are
expected to fulfil the highest standards of water
resistance. Appropriate for leathers tested by
the Maeser method. Contains silicone.
Densodrin EN Anionic water repellent with high fastness for
leathers with a medium degree of water
resistance. Appropriate for leathers tested
by the Bally Penetrometer method.
Densodrin ENS Anionic water repellent with high fastness for
leathers with a moderate to high degree of
water resistance. Appropriate for leathers
tested by the Bally Penetrometer method.
Densodrin OF Anionic, silicone-based water-repellent additive.
Applied in aqueous float with Densodrin CD,
Densodrin EN or Densodrin ENS. Enhances the
water resistance and softness of the leather
and gives a smooth, silky handle. Can also be
applied as a handle modifier in finishing.
Densodrin PS Silicone containing polymer emulsion. It forms
the basis of a new water-repellent system which
has been specially developed to make it easier
to produce stiff, water-resistant leather. Used in
combination with other water-repellents e. g.
Densodrin CD, Densodrin EN or Densodrin
ENS. Appropriate for leathers tested by the
Densodrin S Anionic, silicone-based water-repellent additive.
Applied in an aqueous float with Densodrin CD,
Densodrin EN or Densodrin ENS as the main
Densodrin SI Additive which contains silicone. Used to
enhance the water resistance of leather,
especially in combination with other products
from the Densodrin range. Densodrin SI can
also be applied to crust or finished leather in
order to obtain a silky handle and to improve
Densotan A Novel type of polymer with a neutralizing and
retanning action. Very effective for producing
water-resistant leather. Boosts the penetration
of water-repellents, speeds up the process,
prevents drawn grain and enhances the
levelling and penetration of dyes. Stabilizer
for water-repellents and fatliquors. Used in
neutralization and/or in small amounts together
with the water-repellent.