Montedipe S.p.a.

Montedison S.p.a.

Montedison Fibre S.p.a.

Montedipe S.r.l.

Gianfranco Biglione

Gian C Fasulo

Antonio Alvares

Guido Bertazzoni

Giuseppe Cigna

Italo Borghi

Roberto Rinaldi

Savino Matarrese

Giorgio Vittadini

Andrea Mattiussi

Gian Claudio Fasulo

Blends having a high molding fluidity and flowability and high thermoresistance comprising:

Blends based on vinyl aromatic polymers having high molding fluidity and

Blends based on vinyl-aromatic polymers having high tenacity and impact strength, comprising:

Blends based on vinyl-aromatic polymers having high tenacity and impact

A polymeric blend based on vinyl-aromatic polymers having high impact resistance and including a thermoplastic polyurethane, a vinyl-aromatic copolymer containing an ethylenically unsaturated nitrile and a rubber, and a vinyl aromatic polymer, all present in specified amounts.

Polymeric blends based on vinyl-aromatic polymers

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

Polymeric blends containing 20-80% by weight of a modified vinyl-aromatic polymer containing from 5 to 15% by weight of a ethylenically unsaturated nitrile, and 80-20% by weight of at least one resin containing aromatic groups selected from aromatic polycarbonates and crystalline aromatic polyesters.

Multilayer polymeric coextruded slabs and structural shapes obtained by contemporaneous extrusion of different polymers in a single extrusion head wherein at least one of the different layers consists of a lamina of a vinyl-aromatic polymer containing up to 20% by weight of an ethylenically unsaturated nitrile. The present invention relates to multilayer polymeric coextruded slabs and structural shapes and to the process for obtaining them. More particularly, the present invention relates to multilayer polymeric coextruded slabs and structural shapes wherein the adhesion is performed by coupling to the polymeric layers a sheet of a vinyl-aromatic polymer containing an ethylenically unsaturated nitrile.

Multilayer polymeric coextruded slabs and structural shapes

Blends based on vinyl-aromatic polymers endowed with improved characteristics of chemical resistance, comprising:

Blends based on vinyl-aromatic polymers endowed with improved

Thermoplastic, high-tenacity, high-flexibility polymeric blends suitable for obtaining molded and thermoformed shaped articles comprising a styrene polymer or copolymer reinforced with ethylene-propylene-diene (EPDM) rubber and an amount higher than 15% by weight of polyethylene.

High-tenacity, High-flexibility polymeric blends

Strengthened high impact resistant styrene polymers having improved physical-mechanical properties, particularly a high resilience at room temperature and at lower temperatures, and break elongation, containing as a dispersed phase an olefinic rubber, preferably an ethylene-propylene or an ethylene-propylene-diene rubber and a polyolefin. The amount of the polyolefin may be up to 15% by weight.

Stengthened high impact styrene polymers showing improved

Polymeric blends based on vinyl-aromatic polymers endowed with high tenacity and chemical resistance comprising:

Polymeric blends based on vinyl-aromatic polymers endowed with high

Polymeric blends containing 20-80% by weight of a modified vinyl-aromatic polymer containing from 5 to 15% by weight of an ethylenically unsaturated nitrile, and 80-20% by weight of at least one resin containing aromatic groups selected from aromatic polycarbonates and crystalline aromatic polyesters.

A process for the production of expandable granules of thermoplastic polymers comprising: (a) the extrusion of the polymer in which an expanding agent is incorporated, through a die-head in order to obtain an expandable polymer; (b) immediate cooling of this polymer in water, kept at a temperature at which the polymer remains in the non-expanded state, but not lower than the Tg of the expandable polymer; (c) cutting of the polymer to granules in water immediately at the outlet of the die-head, and (d) annealing of the thus obtained granules, by slow cooling in a temperature range comprised between at least +5.degree. C. and at least -5.degree. C. the Tg of the expandable polymer, wherein the cooling and the cutting of the polymer to granules and the annealing thereof are carried out under pressure. The apparatus comprises an extruder; a means for injecting the expanding agent into the extruder; a die-head; a chamber fastened to said die-head and provided with cutter and pipes for feeding water under pressure; a tower for the annealing of the granules and a means for maintaining the pressure in the chamber and in the tower.

Process for the production of expandable granules of thermoplastic

There is disclosed a process for the preparation of expandible particles of styrene-based polymers which are useful for the production of molded bodies, especially large blocks, having a uniform cellular structure, and with a particularly short time of residence in the mold.

Process for preparing expandible particles of styrene-based polymers

Expandible polystyrene particles useful for making molded bodies, particularly large blocks having a uniform cellular structure and a particularly short residence time in the mold, are prepared by polymerizing styrene in the presence of at least one ether having the general formula (III) or (IV): ##STR1## wherein: R.sub.1 and R.sub.2, which may be the same or different, are alkyl or cycloalkyl radicals and/or phenyl radicals, optionally halogen-substituted;

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Mantova, Italy

Gianfranco Biglione