Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1979-03-23
1981-03-10
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
525243, 525316, C08K 501
Patent
active
042553156
ABSTRACT:
An otherwise conventional two-stage (mass suspension polymerization system for making impact polystyrene is modified in several respects: (a) the rubber (about 7% to about 10% of the polymerization charge) to be dissolved in styrene has a cis content greater than 97%, (b) a portion, i.e. 5-15%, of the free-radical catalyst to be used is added at the beginning of the mass polymerization stage, i.e. at about 235.degree.-250.degree. F. after dissolving the rubber in the styrene, and (c) the addition of the major portion (about at least 85%) of the mercaptan chain regulator added is made at the time of the initiation of the mass polymerization stage when the temperature first reaches the temperature employed for mass polymerization (such temperature selected from the range of 235.degree.-250.degree. F.). The rubber used should have a viscosity as a 5% solution in toluene of 70-95 cps at 25.degree. C. Mineral oil, preferably high boiling, containing at least 20% saturated naphthenic hydrocarbons, is added in an amount of about 1.3% to about 2.3% of the reaction charge. The resulting product is exceptionally high in impact resistance.
REFERENCES:
patent: 3428712 (1969-02-01), Carrock
patent: 3506740 (1970-04-01), Dempsey
patent: 3996311 (1976-12-01), Westphal
Krayer William L.
Michl Paul R.
United States Steel Corporation
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