BASF Final discussion Nov 2010

Chemical nature - Masked glutaraldehyde
Characteristic features
pH (1 : 10) approx. 4


Free of formaldehyde
Low methanol content
Dec. 2009_Brostian
Leather Chemicals
Dec. 2009_Brostian
Leather Chemicals
Basyntan® EF liq.
Chemical Features


Triazine-Oligo/Polyol Chemistry
In polymer chemistry, polyols are compounds with multiple hydroxyl functional groups available for organic reactions. Free of formaldehyde, phenol, chlorine and inorganic salts Very low ionic strength and charge loading of the leather Good dispersant
Leather Chemicals
Basozym® CS 10
Basozym CS 10 is a special enzyme preparation that is applied in acidic media to open up the structure of the hides and skins. It relaxes the fibre structure of the skin. This improves the softness and elasticity of the skins and pelts. Characteristic features Enzymatic activity approx. 900 LVU pH (1 : 10) approx. 5
It reduces the time required to retann the leather and the consumption of chemicals at the retannage. Its excellent dispersing action ensures that the substances that are applied to the leather here and at subsequent stages of the process are distributed more evenly. It promotes the penetration of dyes through the cross-section.
Application:Wet blue or wet white can be bated by leaving it
overnight in a bath containing 3 – 5 g/l of Basozym CS 10 at a pH of 4.5 – 6.0. The leather should then be washed thoroughly the next day and processed as usual.
The potential for cross-linking is obviously greater because it can occur through both the CHO groups and over variable distances. In aqueous solutions, glutaraldehyde is present largely as polymers of variable size.
There is a free aldehyde group sticking out of the side of each unit of the polymer molecule , as well as one at each end.
Leather Chemicals
Tamol® M
Synthetic tanning agent and dyeing auxiliary with a pronounced dispersing action.
Condensation product of aromatic sulphonic acids
BASF Performance Chemicals
Leather Chemicals
Topic:
BASF trials Nov. 2010
Hokuyo Guangzhou, Nov. 2010
M. Brostian June 2010
Leather Chemicals
Trial plan
Article /Material

Very fine milling grain Compatible with any retanning agent Can be combined with chrome but in separate additions Active material 100 %
Dec. 2009_Brostian
Pieces
Improvement req.
Chrome carseat 1,25 mm
5 hides cross check
Target crust yield 100%,current 98%
Chrome free carseat 1,10 mm
5 hides cross check
More compact fiber
Physical Features

Oily, water miscible liquid pH (1:10 with water): 9.0
100 % active content
Dec. 2009_Brostian
Leather Chemicals
Basyntan EF liquid
O O O Collagen N O H O H Polyol X = Spacer N O H O X X O R N O N O H R N O N N N O
பைடு நூலகம்
R N Collagen
Binding of Polyol‘s is based on donor / acceptor interaction between the amide backbone or functional groups of collagen with OH -groups of polyol
Leather Chemicals
Densotan® A
Special polymer for use in post-tanning treatment processes

Densotan® A is a very versatile, high-performance dispersing agent that enhances the performance of post-tanning treatment processes and makes them easier to control
Particularly recommended for use on automotive leather because of its high fastness and very low fogging. Densotan® A provides the following advantages.
Glutaraldehyde-potential for cross-linking
Glutaraldehyde has fairly small molecules, each with two aldehyde groups, separated by a flexible chain of 3 methylene bridges. It is HCO-(CH2)3-CHO.
Dec. 2009_Brostian
Leather Chemicals
Densotan® A
Dispersion of chemicals and Penetration of dye
leather 1 without Densotan® A
leather 2
with Densotan A
Dec. 2009_Brostian
Good fullness, fine grain Application: Neutralization
– –
Re-tannage After fat-liquoring

Re-tannage of wet white
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–
Suited for white leathers
Suited for Eco leathers due to zero formaldehyde and excellent physical properties (Fakra, tear-strength)
Tamol® M provides the following advantages.
It reduces the tendency of vegetable tanning agents to form large, highly astringent particles. It enables dyes to penetrate more easily through the leather on account of its dispersing action. It enhances the leveling of dyes and float exhaust