Process for producing thermo-expansive microcapsules
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United States of America Patent
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Jun 7, 2005
Grant Date -
Dec 5, 2002
app pub date -
Mar 22, 2001
filing date -
Mar 27, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for producing thermo-expansive microcapsules wherein a polymerizing mixture containing ethylenic unsaturated monomer and a blowing agent is suspend-polymerized to microencapsulate the blowing agent with the resultant polymer. The above-mentioned suspension-polymerization is performed with the presence of at least one compound selected from the group consisting of polypeptides and derivatives thereof as a suspension stabilizer. The process can control the particle size of microcapsules easily, attain stable reaction system and produce thermo-expansive microcapsules that disperse well in medium such as paint or inks.
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