Process for the preparation of an aqueous dispersion of an anionic polyurethane free of volatile tertiary amines
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United States of America Patent
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Jul 29, 2003
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N/A
app pub date -
Aug 28, 2001
filing date -
Oct 15, 1999
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for the preparation of an aqueous dispersion of an anionic polyurethane. According to the invention, a tertiary amine functional urethane polymer or oligomer acts as acid neutralizing agent. The process of the invention comprises the steps of: dispersion of an anionic isocyanate functional polyurethane prepolymer in water in the presence of a tertiary amine functional urethane polymer or oligomer and chain extension of the anionic polyurethane prepolymer with a reactive hydrogen functional material during or after the dispersion in water.
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