Process for aftertreating tanned leather and pelts

Details Process for aftertreating tanned leather and pelts Process for aftertreating tanned leather and pelts

1994-09-06

1996-09-24

Willis, Jr., Prince

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9422, 8 9423, 252 857, 5253277, 5253276, 5253278, C14C 900, C08F12206

Patent

active

055586759

ABSTRACT:
A process for aftertreating tanned leather and pelts to impart a very soft and supple handle and good fullness to them, which comprises subjecting the leather or pelts to an aftertreatment with a polymer which is obtainable by (a) polymerising a monoethylenically unsaturated dicarboxylic anhydride of 4 to 8 carbon atoms or a mixture of said dicarboxylic anhydrides, and (b) thereafter partially esterifying and/or amidating the polymer with (b.sub.1) a C.sub.1 -C.sub.30 alcohol and/or a primary or secondary amine and/or (b.sub.2) the reaction product of (.alpha.) an unsaturated or saturated C.sub.1 -C.sub.30 fatty alcohol, a C.sub.8 -C.sub.22 fatty acid, a C.sub.8 -C.sub.22 fatty amine or a C.sub.8 -C.sub.22 fatty amide and (.beta.) ethylene oxide and/or propylene oxide in the molar ratio 1:2 to 1:20, and, optionally, hydrolysing the anhydride groups of the homopolymer with an aqueous base.

REFERENCES:
patent: 3919258 (1975-11-01), Richardson et al.
patent: 4018702 (1977-04-01), Boffardi et al.
patent: 4086177 (1978-04-01), Kubitschek et al.
patent: 4196271 (1980-04-01), Yamada et al.
patent: 4734204 (1988-03-01), Lamb
patent: 5130369 (1992-07-01), Hughes et al.
The Random House College Dictionary, p. 68, (1973) (month unknown).
The Random House College Dictionary, p. 763, (1973) (month unknown).
WPI Abstract of EP 418661, Mar. 27, 1991.
WPI Abstract of EP 412389, Feb. 13, 1991.

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