Process for producing thermo-expansive microcapsules

Details Process for producing thermo-expansive microcapsules Process for producing thermo-expansive microcapsules

2005-06-07

2005-06-07

Acquah, Samuel A. (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

C521S056000, C521S059000, C521S097000, C521S139000, C521S140000, C523S201000, C523S202000, C523S205000, C523S206000, C523S210000, C523S223000, C524S834000

Reexamination Certificate

active

06903143

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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