Bisulfite-blocked polyisocyanates as tanning agents
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United States of America Patent
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Apr 8, 1997
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N/A
app pub date -
Jun 1, 1995
filing date -
Jun 28, 1994
priority date (Note) -
Expired
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Abstract
The present invention relates to tanning agents containing carbamoyl sulfonate groups that are prepared by the reaction of (A) organic polyisocyanates, (B) 0.01 to 0.4 equivalents, relative to the isocyanate groups of polyisocyanate (A), of polyether alcohols having incorporated polyalkylene oxide units (the equivalents of the polyether alcohol being based on the hydroxyl groups), wherein 40 to 100 mole-% of the polyalkylene oxide units consist of polyethylene oxide units having a sequence length of 5 to 70, (C) optionally, NCO-reactive components other than polyether polyol (B), and (D) ammonium or alkali bisulfites or disulfites.
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