Polyurethane dispersion with high film hardness, process for preparing it, and its use
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United States of America Patent
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Issued Date -
Dec 19, 2002
app pub date -
Mar 13, 2002
filing date -
Mar 15, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A description is given of a polyurethane (hybrid) dispersion with high film hardness, high flexibility and good emulsion stability which comprises the following reaction components: (A) from 3 to 25% by weight of a polyol component consisting of (i) from 2 to 20% by weight of a polymeric polyol having two or more polyisocyanate-reactive hydroxyl groups and a molar mass of from 500 to 4 000 daltons (ii) from 0.5 to 5% by weight of a low molecular mass polyol having two or more polyisocyanate-reactive hydroxyl groups and a molar mass of from 50 to 500 daltons (B) from 3 to 30% by weight of an anionically modifiable 1,2-polymethacrylatediol, (C) from 2 to 20% by weight of a polyisocyanate component, (D) from 0 to 6% by weight of a solvent component, (E) from 0.15 to 1.5% by weight of a neutralizing component composed of at least one organic or inorganic base, (F) from 0 to 1% by weight of a chain extender component composed of one or more polyamines having two or more polyisocyanate-reactive amino groups, and, optionally (G) from 5 to 40% by weight of a monomer component, (H) from 0.01 to 1.5% by weight of an initiator component, and water as the remainder.
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