Bleaching and dyeing; fluid treatment and chemical modification – Treatment of hides – skins – feathers and animal tissues – Tanning
Patent
1997-02-12
1998-01-20
Diamond, Alan
Bleaching and dyeing; fluid treatment and chemical modification
Treatment of hides, skins, feathers and animal tissues
Tanning
8 9422, 8 9423, 8 9433, 8436, C14C 322
Patent
active
057097143
ABSTRACT:
The present invention is directed to a method of treating tanned leather stock to improve its color expression characteristics. The method provides for utilizing a two-stage amphoteric polymers, which improve the color expression characteristic of the tanned leather stock while still retaining desired grain break and tensile strength. The tanned leather stock is contacted, preferably by immersion, in a float containing particles of an amphoteric polymer dispersed therein and a desired colorant. The amphoteric polymer particles comprise a first stage copolymer polymerized from at least one monomer containing an anionic functionality, such as, an acid functionality, with at least one first stage comonomer and a second stage copolymer polymerized from at least one monomer containing the cationic functionality, such as, an amine functionality, with at least one second stage comonomer.
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Natoli John
Volpe, Jr. Anthony Frank
Deshmukh Sudhir G.
Diamond Alan
Rohm and Haas Company
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