Abstract: Sulfonated resins useful as retanning and fatliquoring agents are obtained by sulfonation of a condensation product of (a) one mole of a hydroxy aromatic component, (b) from about 0.05 to 1.5 mole of an unsaturated oil and (c) about 0.4 to about 1.0 mole of a formaldehyde liberating composition. The hydroxy aromatic component may be phenol, a lower alkyl phenol having at least one reactive hydrogen in the 2-,4- or 6-position on the aromatic ring or a mixture thereof. The unsaturated oil may be castor oil or moellon. The formaldehyde liberating composition may be formaldehyde or a composition capable of producing formaldehyde.

Abstract: The present invention relates to the treatment of leather and more particularly to a novel non-rewet dry cleanable leather, and the treatment method by which it is produced. The water-resistance property of a leather which has been treated with a polymeric phosphate ester syntan is significantly improved by subsequently subjecting such a treated leather to a non-aqueous solvent extraction procedure.