Use of polymerizable oil for leather fatliquor
AssigneeThe United States of America as represented by the Secretary of Agriculture
InventorPaul L. Kronick
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Abstract
Novel fatliquoring compositions used for treating mineral-tanned leathers are effective substitutes for oils which have conventionally been used to soften leather. The compositions comprise monomers which polymerize in situ and soften the leather by breaking the leather fibers into smaller units which can move about when the leather is deformed. Useful monomers are unsaturated phosphatidyl esters, such as phosphatidyl choline, and unsaturated fatty monomers, such as esters of unsaturated fatty alcohols and acrylic acid and vinyl esters of unsaturated fatty acids.
Claims18
A method of treating mineral-tanned leather, said method comprising
- a) combining said leather with a fatliquor composition to form a mixture,
- b) agitating the mixture of leather and fatliquor composition,
- c) drying the leather from step b) at elevated temperature so as to polymerize the monomers, and
- d) washing the dried treated leather with a solvent,
- wherein said fatliquor composition comprises monomers dispersed in aqueous solution, and wherein said monomers are unsaturated phosphatidyl ester monomers or unsaturated fatty monomers having chain lengths from about 15C to about 25C and are esters of unsaturated fatty alcohols and acrylic acid, vinyl esters of unsaturated fatty alcohols, vinyl alkenyl ethers or vinyl esters of unsaturated fatty acids, acrylates of branched-chain alcohols having the formula RR'CH.sub.2 OH where R and R' are butyl and decyl, hexyl and octyl or heptyl and heptyl, respectively, or mixtures thereof.
Dependencies are inferred from the claim text.