Process for the filling of leather and compositions therefor
AssigneeCiba-Geigy Corporation
InventorsAlbert Wurmli, Hubert Wachsmann
Life of this patent
Estimating the term…
Abstract
A process for the filling of leather tanned with mineral, vegetable and/or synthetic tanning agents by treating the leather, in the acid pH-range , with an aqueous solution of a filling agent consisting of unsubstituted or substituted homo- or copolymeric acrylic acids and protein glue, alone or in admixture with further additives, as well as dry or liquid compositions thereof, are disclosed; thereby an even fullness of the leather is obtained without impairing the handle, the buffing properties, the tightness of the grain, the fine grain or the dyeability of said leathers.
Claims9
In a process for the filling of leather tanned with mineral, vegetable and/or synthetic tanning agents, the improvement which consists of treating the leather in the acid pH-range, with an aqueous solution of a filling agent consisting of
- a. a homopolymer or copolymer selected from the group consisting of acrylic acid, methacrylic acid, .alpha.-ethylacrylic acid, .alpha.-isopropylacrylic acid, .alpha.-butylacrylic acid and .alpha.-chloroacrylic acid or
- b. copolymers formed from a monomer of component (a) as defined above and a vinyl unsaturated monomer selected from the groups consisting of
- .alpha.. water-soluble comonomers containing carboxylic acid groups, carboxylic acid amide groups and their N-hydroxyalkyl derivatives, water-soluble derivatives of .beta.-hydroxyalkyl acrylic or methacrylic acid amides, or aldehydes capable of copolymerisation;
- and
- .beta.. water-insoluble comonomers consisting of optionally substituted acrylic or methacrylic acid alkyl esters having from 1 to 12 carbon atoms in the alkyl radical;
- vinyl esters of aliphatic carboxylic acids, containing from 1 to 12 carbon atoms, or mixtures of such carboxylic acids;
- or vinyl benzenes;
- and
- c. protein glue in a weight ratio of polymer to glue of from 1:12 to 12:1,
- alone or in admixture with further additives.
A composition used as agent for the filling of leather tanned with mineral, vegetable and/or synthetic tanning agents essentially consisting of
- a. a homopolymer or copolymer selected from the group consisting of acrylic acid, methacrylic acid, .alpha.-ethylacrylic acid, .alpha.-isopropylacrylic acid, .alpha.-butylacrylic acid and .alpha.-chloroacrylic acid, or
- b. copolymers formed from a monomer of component (a) as defined above and a vinyl unsaturated monomer selected from the groups consisting of
- .alpha.. water-soluble comonomers containing carboxylic acid groups, carboxylic acid amide groups and their N-hydroxyalkyl derivatives, water-soluble derivatives of .beta.-hydroxyalkyl acrylic or methacrylic acid amides, or aldehydes capable of copolymerisation;
- and
- .beta.. water-insoluble comonomers consisting of optionally substituted acrylic or methacrylic acid alkyl esters having from 1 to 12 carbon atoms in the alkyl radical;
- vinyl esters of aliphatic carboxylic acids, containing from 1 to 12 carbon atoms, or mixtures of such carboxylic acids;
- or vinyl benzenes;
- and
- c. protein glue in a weight ratio of polymer to glue of from 1:12 to 12:1,
- alone or in admixture with further additives.
Dependencies are inferred from the claim text.