PROCESS FOR PRODUCING HEAT-EXPANDABLE MICROSPHERES
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United States of America Patent
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Jun 9, 2016
app pub date -
Aug 25, 2014
filing date -
Aug 28, 2013
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Abstract
Provided is a process for efficiently producing heat-expandable microspheres having high solvent resistance. The process produces the heat-expandable microspheres composed of a shell of a thermoplastic resin and a blowing agent encapsulated therein and vaporizable by heating, and includes the steps of preparing an aqueous suspension by dispersing an oily mixture containing a polymerizable component, the blowing agent, and a polymerization initiator containing, as an essential component, a peroxide A having a theoretical active oxygen content of at least 7.8%, and polymerizing the polymerizable component in the oily mixture.
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