Aqueous microgel from carboxyl latex polymer, acrylic-epoxy and diepoxide
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United States of America Patent
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Mar 2, 1999
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N/A
app pub date -
Aug 18, 1997
filing date -
May 1, 1997
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Expired
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Abstract
An aqueous protective coating composition particularly useful for can coatings based on a polymeric binder comprises diepoxide crosslinked microgel particles. The microgel polymer is produced by dispersing into water a carboxyl functional acrylic-epoxy copolymer and combined with a carboxyl functional latex polymer along with a low molecular weight diepoxide, followed by coreaction and crosslinking between the carboxyl polymers and the diepoxide to form stable aqueous dispersed microgel particles. In a preferred aspect of the invention, the carboxyl latex polymer is a swollen latex polymer.
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