Process for producing leather

Details Process for producing leather Process for producing leather

1980-08-21

1982-06-15

Lilling, Herbert J.

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

8 9419R, 8 9426, 252 857, 428473, C14C 306, C14C 308

Patent

active

043348769

ABSTRACT:
This invention relates to an improved process for producing a tanned heavy leather, sometimes called full thickness leather, suitable for use for shoe soles, belts and straps, bags and cases, and saddles, bridles, and harness, wherein, under carefully controlled pH conditions, leather stock is subjected to a multiple-stage tanning process involving a first treatment with an aqueous dispersion or solution of a synthetic polymeric composition made by polymerizing at least one member selected from the group consisting of acrylic acid and methacrylic acid and, optionally, one or more polymerizable compounds selected from the group of alkyl esters of acrylic acid, alkyl esters of methacrylic acid and sulfated unsaturated drying oils, followed by a second treatment with a zirconium tanning compound having a 0-45% basicity by the Schorlemmer scale.

REFERENCES:
patent: 2826477 (1958-03-01), Rau et al.
patent: 3408319 (1968-10-01), Rau
patent: 3519378 (1970-07-01), Luck et al.
Derwent Abs. 26117 [DL-133-687], Jan. 17, 1979, "Leather for Shoe Uppers . . . ".
Derwent Abs. 34850 [SU561-733], Aug. 25, 1977, "Leather Prod. from Hides . . . ", [equivalent C. Abs. 871103388h-Zurabyan et al].
Chem. Abs. vol. 88: 171813p, "Tanning of Shoe Sole Leathers . . . ", Shapirov et al.

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