Montedipe S.r.l.

Montedison S.p.a.

Montedipe S.p.a.

Savino Matarrese

Italo Borghi

Andrea Mattiussi

Claudio Buonerba

Franco Balestri

Dario Ghidoni

Gianfranco Biglione

Gian C Fasulo

Anna Grazia Rossi

Giuseppe Cigna

Francesco Anfuso

Andrea Callaioli

Mauro Lo Consolo

Dino Dall'Acqua

This invention relates to blends based on vinyl aromatic polymers endowed with high mechanical characteristics, even after successive processings at temperatures equal to or greater than 200.degree. C., comprising:

Blends based on vinyl aromatic polymers with enhanced mechanical

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.

Process for the continuous bulk production of high impact vinylaromatic

Exapandable beads of blends of poly (phenylene-ether) and a vinyl aromatic polymer are prepared by carrying out the polymerization of the vinyl aromatic monomer in presence of the poly(phenylene-ether) and of an expanding agent.

Process for the preparation of expandable beads

A process for the devolatilization of polymer solutions including:

Process for the devolatilization of polymer solutions

Modified impact-resistant vinylaromatic copolymers containing from 2 to 10% by weight of an ethylenically unsaturated nutrile and from 0 to 30% by weight of alpha-methyl-styrene and having a gel content higher than 23%, a cracking resistance, in an olive oil/oleic acid mixture under a load of 10 MPa, higher than 100 min., and a melt index below 1.5 g/10 minutes.

Modified impact-resistant vinylaromatic copolymers

Process for the continuous production in solution of styrene thermoplastic resins by polymerization of a vinyl-aromatic monomer and of a vinyl-nitrile monomer in the presence of an elastomer and of a starter, wherein polymerization is conducted in two or more steps, wherein the elastomeric component is fed, in solution in the solvent and/or in the monomers, to the first step, polymerization is carried out in the subsequent steps at temperatures ranging from 70.degree. to 150.degree. C., in each step the reaction mass is gently and homogeneously stirred and the reaction product is caused to flow to a thin evaporator heated at 150.degree.-300.degree. C.

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Verona, Italy

Savino Matarrese