Polymerization of styrene acrylonitrile expandable microspheres

Details Polymerization of styrene acrylonitrile expandable microspheres Polymerization of styrene acrylonitrile expandable microspheres

1975-06-23

1976-03-23

Foelak, Morton

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 855HC, C08J 918, C08J 916

Patent

active

039459560

ABSTRACT:
Expandable styrene-acrylonitrile microspheres are prepared by polymerizing a mixture of styrene and acrylonitrile with a volatile liquid blowing agent in an encapsulating system to provide expandable microspheres with a styrene-acrylonitrile polymer shell and a single drop of liquid blowing agent encapsulated symmetrically therein. Expandable microspheres of larger size, narrower size distribution and improved expansion characteristics are obtained using an alcohol in the polymerization system.

REFERENCES:
patent: 3615972 (1971-10-01), Morehouse, Jr.
patent: 3740359 (1973-06-01), Garner

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