Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather
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United States of America Patent
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Jun 26, 1990
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N/A
app pub date -
Sep 20, 1988
filing date -
Sep 22, 1987
priority date (Note) -
Expired
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Abstract
A condensate of bis-(4-hydroxyphenyl) sulfone, an aldehyde, a dialdehyde and/or glyoxylic acid and aminoacetic acid or an N-substituted aminoacetic acid is prepared and used as a tanning assistant, in a process for tanning leather in combination with, in particular, aluminum tanning agents.
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