Process for the preparation of polymer particles
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Dec 30, 1998
filing date -
Jul 4, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Particles of a copolymer of a vinyl arene and a copolymerizable compound containing a polar moiety and a vinyl moiety containing water may be prepared by forming a mixture of monomers and small amounts of water and polymerizing under agitation to 20 to 70% conversion and then suspending the mass in water and finishing the polymerization. The resulting polymer beads contain finely dispersed water which is useful as an environmentally acceptable blowing agent.
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