METHOD OF PRODUCING HYDROPHOBIC LEATHER Russian patent published in 2010 - IPC C14C13/00 C14C9/00 C14C9/02 C14C3/14 C14C3/28 

FIELD: chemistry.

SUBSTANCE: method involves tanning a semi-finished product with a chrome tanning agent, neutralisation, washing, dyeing and tanning with organic tanning agents twice. The first tanning is carried out with a polymeric tanning agent, while the second is carried out with a mixture of synthetic and vegetable tanning agents. Hydrophobicising greasing, treatment with an organic acid and re-tanning with a chrome tanning agent are then carried out. Additional washing is carried out before neutralisation. Dyeing is carried out after the second tanning. Neutralisation, tanning twice and dyeing are carried out at water-to-goods ratio of 0.5-0.7. Hydrophobicising greasing is carried out in the presence of a 20% solution of the product of reacting amino alcohol with fatty acids of vegetable oils of the C₁₂-C₂₂ fraction and boric acid in molar ratio of 2:1:1 in mineral oil in amount of 0.5-1.5% of the weight of the semi-finished product.

EFFECT: good hygienic properties of hydrophobic leather and prolonged fungus resistance of the leather in high humidity and temperature conditions.

2 tbl, 5 ex