Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-02-28
1992-11-24
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 53, 525 54, 525243, 525261, 525263, 525301, 525302, 525316, C08F27900
Patent
active
051662604
ABSTRACT:
Process for the continuous bulk production of high impact vinylaromatic copolymers in which the vinylaromatic monomer, and if present, a comonomer selected from the group consisting of acrylonitrile, methacrylonitrile, acrylic acid, methacrylic acid and their alkyl- or cyclo-alkyl-esters containing from 1 to 8 carbon atoms in the alkyl group, the rubber, a part of the diluent solvent and the catalyst are premixed in a premixer at a temperature under 100.degree. C. and fed to a plug-flow agitated tubular reactor, which is divided into several stages or zones. The excess mixture is recycled to the premixer and the remaining part of the diluent solvent is injected into the top of the reactor to prevent the formation of incrustations. In the first zone of the reactor, the temperature and the residence time of the mixture are regulated so to have the halving the catalyst life.
The polymerization is carried on in the following zones of the reactor until at least the 40% by weight of solids and it is eventually brought to conclusion in one or more consecutive tubular reactors like the first one. The reactors are set in series.
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Chemical Engineers' Handbook, Fourth Edition, 1964, pp. 24-25, John H. Perry, et al. Ed.
Balestri Franco
Borghi Italo
Buonerba Claudio
Matarrese Savino
Delmendo R. H.
Montedipe S.r.l.
Schofer Joseph L.
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