Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-01-11
1995-02-07
Jagannathan, Vasu S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 52, 525 53, C08F27904, C08F 238
Patent
active
053876504
ABSTRACT:
A process for the continuous preparation of high-impact polystyrene-acrylonitrile (ABS) by free radical-initiated polymerization of a mixture of from 60 to 90% by weight of at least one vinylaromatic monomer and from 10 to 40% by weight of least one further ethylenically unsaturated monomer, in the presence of from 5 to 30% by weight, based on the sum of the monomers, of polybutadiene having a solution viscosity (5% strength by weight in styrene at 25.degree. C.) from 25 to 95 mPa.s and in the presence or absence of a solvent, in at least three consecutive reactors operated essentially without back-mixing, at from 50.degree. to 170.degree. C., phase inversion taking place in one of the reactors, involves carrying out the polymerization as far as phase inversion at 90.degree. C. or below and initiating the polymerization by free radicals from the decomposition of tert-butyl peresters whose half life period at 90.degree. C. is not more than 20 minutes, the polybutadiene content, based on the total reaction mixture, being at least 10% by weight and at most 25% of the total amount of chain-transfer agent (regulator) required being added up to the time of phase inversion and the remainder being added thereafter.
REFERENCES:
patent: 3243481 (1966-03-01), Ruffing et al.
patent: 3624185 (1971-11-01), Lederer et al.
patent: 4042647 (1977-08-01), Cornell
patent: 4252911 (1981-02-01), Simon
patent: 4410659 (1983-10-01), Lee et al.
patent: 4421895 (1983-12-01), Echte et al.
patent: 4925896 (1990-05-01), Matarrese et al.
patent: 5250611 (1993-10-01), Baumgartner et al.
patent: 5278253 (1994-01-01), Baumgartner et al.
Chem. Abst. JP 63/199 717 Aug. 1988.
Chem. Abst. JP 63/207 804 Aug. 1988.
Chem. Abst. JP 63/207 803 Aug. 1988.
Chem. Abst. JP 54/070 350 Jun. 1979.
Baumgartner Ehrenfried
Hofmann Juergen
Jung Rudolf H.
Moors Rainer
Schaech Hansjoerg
BASF - Aktiengesellschaft
Jagannathan Vasu S.
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