Process for the production of oligourethanes containing terminal mercapto groups
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United States of America Patent
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Apr 11, 1989
Grant Date -
N/A
app pub date -
Jan 13, 1987
filing date -
Jan 17, 1986
priority date (Note) -
Expired
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Abstract
A process for the production of oligourethanes containing terminal mercapto groups in which the adduct of propylene oxide with trimethylol propane and/or glycerol and/or trimethylol ethane as alkylene oxide adduct containing OH-groups is reacted with isomeric tolylene diisocyanates in excess, based on hydroxyl groups, and the isocyanate groups are further reacted with mercaptoethanol. The adduct of propylene oxide with the trifunctional alcohol is intended to have a calculated molecular weight of from about 1800 to about 6000 and preferably of from about 2000 to about 5000, the reaction products being used for the production of sealing compounds hardening by oxidation or as an additive for crosslinkable epoxy resin systems.
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