Process for the preparation of rubber-reinforced monovinylidene aromatic polymers
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
Aug 7, 1990
filing date -
Aug 9, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a process for the production of a rubber-reinforced polymer composition having a bimodal particle size distribution using parallel, substantially plug flow reactors to separately polymerize the same or different solutions of a rubber in a monovinylidene aromatic monomer and optionally at least one other monomer. After separate partial polymerizations, first and second prepolymer compositions are produced containing rubber particles having average particle sizes of from 0.05 to 1.5 micrometer and from 0.7 to 10 micrometer, respectively, with the average rubber particle size of the second prepolymer composition being at least 1.3 times the average rubber particle size of the first prepolymer composition.
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