Aqueous dispersions of at least one biodegradable polymer
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United States of America Patent
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Issued Date -
Mar 17, 2005
app pub date -
Sep 8, 2004
filing date -
Sep 12, 2003
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Abandoned
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Abstract
The present invention relates to aqueous dispersions of at least one biodegradable polymer comprising an organic phase dispersed in a dispersing aqueous phase and free of volatile organic compounds, characterized in that the said organic phase comprises at least one viscosity-reducing agent with a solubility parameter of between 15 and 28 (J.cm.sup.-3).sup.0.5, preferably between 16 and 23 (J.cm.sup.-3).sup.0.5 and even more preferably between 18 and 21 (J.cm.sup.-3).sup.0.5, and a hydrogen bonding parameter .delta.H of between 3.5 and 15 (J.cm.sup.-3).sup.0.5, preferably between 4 and 13 (J.cm.sup.-3).sup.0.5 and even more preferably between 5 and 10 (J.cm.sup.-3).sup.0.5, and at least one biodegradable polymer in a polymer/viscosity-reducing agent weight ratio of from 99.8/0.2 to 60/40, preferably between 97/3 and 70/30 and more preferably between 92/8 and 70/30.
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