Patent ID: 6827745
Filing Date: 2004-12-07
Classification: C08K,C14C

Abstract:
A mixture for use in tanning leather, said mixture comprising:(I) a phosphorus-containing compound selected from the group consisting of tris(hydroxymethyl)phosphine (THP); tetrakis(hydroxymethyl)phosphonium salts (THP+ salts); condensates of THP with organic nitrogen compounds (THP condensates); and compounds of the formula RP(CH2OH)3, wherein R is an organic group which does not react chemically with collagen in said leather (THP analogues); and (II) at least one water-soluble moderator selected from the group consisting of (A) metaphosphate salts and (B) aliphatic polyhydroxy or polypyrrolidone compounds selected from the group consisting of sorbitol, glycerol, trimethylolpropane, pentaerythritol, mannitol, mono and di-saccharide sugars, alginates and polyvinyl pyrrolidone.