C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2027, 400/50
C08F 255/04 (2006.01) C08F 2/06 (2006.01) C08F 212/06 (2006.01) C08F 255/06 (2006.01)
Patent
CA 1290872
ABSTRACT OF THE DISCLOSURE: A Process for the continuous production in solution of styrene thermoplastic resins by polymerization of a vinylaromatic monomer and of a vinyl-nitrile monomer in the presence of an elastomer and of a starter, wherein the polymerixation is conducted in two or more steps. The elastomeric component fed in solution in the solvent and/or in the monomers, to the first step, is subjected to polymerization in this first step and in the subsequent steps at temperatures ranging from 70° to 150°C. In each step, the reaction mass is gently and homogeneously stirred and the reaction product is caused to flow to a thin film evaporator heated at 150°-300°C. This process permits to control the elimination of the heat of reaction and to maintain good control of the particle sizes and, at any rate a wide distribution of the grafted chains and of their molecular weights due to a wide distribution of the residence times. As a result, impact-resistant thermo- plastic styrene resins having a high resistance to atmospheric agents, and a high resilience and surface brightness, are obtained.
563433
Borghi Italo
Cigna Giuseppe
Lo Consolo Mauro
Matarrese Savino
Rossi Anna Grazia
Montedipe S.p.a.
Robic
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