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US 6,685,747 B1Granted
Mixture of THP and chrome as tanning agents
AssigneeRhodia Consumer Specialties Limited
InventorsRobert Burrow, Daniel Sundah
Life of this patent
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Abstract
THP and chrome are synergistic tanning agents. The combination of THP with small amounts of chrome and optionally non-ionic and/or cationic surfactants gives increased area yield and shrink temperature compared with THP, and reduced environmental impact compared with chrome. It is possible to combine degreasing, pre-tan and main tan in a single step.
Claims13
A synergistic tanning composition comprising, in aqueous solution,
- (A) a phosphorus compound selected from the group consisting of tris(hydroxymethyl) phosphine (THP), tetrakis(hydroxymethyl) phosphonium salts (THP salts) and THP condensates, and
- (B) a mineral tanning salt,
- wherein said mineral tanning salt (B) is a chromium tanning salt and the weight ratio of (A):(B) is from 200:1 to 1:1.
Dependencies are inferred from the claim text.