Use of ester urethanes for retanning
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United States of America Patent
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May 23, 1995
Issued Date -
N/A
app pub date -
Sep 20, 1994
filing date -
Mar 25, 1993
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for retanning chrome-tanned leather comprising applying to leather a reaction product of (a) at least one glycerol monoester of a saturated C.sub.12-18 monocarboxylic acid, (b) at least one diisocyanate selected from the group consisting of toluene diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate, and (c) dimethylolpropionic acid, wherein (i) the components (a), (b) and (c) are so selected that the molar ratio of the isocyanate groups of component (b) to the sum of the hydroxyl groups of components (a) plus (c) is about 0.5 to about 1.05 and (ii) the molar ratio of compound (c) to compound (a) is about 0.7 to about 1.5 and wherein (iii) the carboxyl groups originating from compound (c) are at least partly neutralized.
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