Production of tanned leather and products suitable therefore

Details Production of tanned leather and products suitable therefore Production of tanned leather and products suitable therefore

2006-01-31

2006-01-31

Einsmann, Margaret (Department: 1751)

Bleaching and dyeing; fluid treatment and chemical modification

Treatment of hides, skins, feathers and animal tissues

Tanning

C008S094330, C008S09419C

Reexamination Certificate

active

06991659

ABSTRACT:
The invention provides a process for the production of tanned and optionally retanned leather by treatment of an optionally (pre)tanned animal hide or pelt with an aldehyde-based treatment agent (A), wherein the optionally (pre)tanned animal hide or pelt is treated with(A) an aldehyde-based treatment agent which may e.g. be(F) a tanning aldehyde or an aldehyde-based stability and/or fastness improving agentor (S) an aldehyde-based syntan,and with(H) at least one hydrazine compound which is semicarbazide or aminoguanidine or a salt thereof, which may include semicarbazide or aminoguanidine salts (HS) of phenolsulphonic acid, naphthalene sulphonic acid or naphtholsulphonic acid,in any desired sequence,or is treated with a reaction product (AH′) of (A) with (HS), or with a reaction product (ES) of (S) with (H), or with a mixture of (H) with a reaction product (AH) of (A) with (H), or with a mixture of (HS) with (A) salts (HS), their production and use,treatment agents for the production of leather, which are mixtures of (HS) with (F) or with (S′), or reaction products (ES) of (S) with (H), or mixtures of (H) with reaction products (AH) of (A) with (H),the reaction products (ES), their compositions, their production and their use.

REFERENCES:
patent: 5256317 (1993-10-01), Lauton
patent: 5326805 (1994-07-01), Sicken et al.
patent: 0 428 481 (1991-05-01), None
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English abstract for EP 0526815, Feb. 10, 1993.
XP-002195002, English abstract for JP 2000217944, Aug. 8, 2000.

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