Abstract: Blends having a high molding fluidity and flowability and high thermoresistance comprising:(a) at least one vinyl-aromatic thermoplastic polymer; and(b) at least one copolyester having a melting point lower than the molding temperature of the thermoplastic polymer (a), and preferably lower than 200.degree. C., a melt viscosity, at 232.degree. C., lower than 50 Pa.S., and obtained from at least one bicarboxylic aromatic acid, at least one aliphatic bicarboxylic acid, and at least one glycol.

Abstract: Blends based on vinyl-aromatic polymers having high tenacity and impact strength, comprising:a vinyl-aromatic copolymer containing from 2 to 25% by weight of an ethylenically unsaturated nitrile and a rubber amount not higher than 15% by weight; anda grafted polymer consisting of an elastomeric core having a transition temperature of the second order lower than 10.degree. C. containing, in the grafted form, chains of vinyl monomers.

Abstract: 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.

Abstract: 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.

Abstract: Blends based on vinyl-aromatic polymers having high tenacity and impact strength, comprising:a vinyl-aromatic copolymer containing from 2 to 25% by weight of an ethylenically unsaturated nitrile and a rubber amount not higher than 15% by weight; anda grafted polymer consisting of an elastomeric core having a transition temperature of the second order lower than 10.degree. C. containing, in the grafted form, chains of vinyl monomers.

Abstract: 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.

Abstract: 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.

Abstract: Blends based on vinyl-aromatic polymers endowed with improved characteristics of chemical resistance, comprising:from 10% to 90% by weight of an impact-resistant styrenic copolymer containing from 8 to 30% by weight of an ethylenically unsaturated nitrile, from 15% to 45% by weight of an olefinic elastomer, and from 77% to 25% by weight of a vinyl-aromatic monomer, andfrom 90% to 10% by weight of a mixture of aromatic group containing resins constituted by from 70% to 99% by weight of an aromatic polycarbonate and from 30% to 1% by weight of an aromatic polyester.

Abstract: 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.

Abstract: 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.

Abstract: Polymeric blends based on vinyl-aromatic polymers endowed with high tenacity and chemical resistance comprising:from 10 to 90% by weight of a vinyl-chloride polymer;from 90 to 10% by weight of a vinyl-aromatic copolymer containing from 2 to 25% by weight of an ethylenically unsaturated nitrile and a quantity not exceeding 15% by weight of a rubber, are disclosed.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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;R.sub.5 is a non-halogenated alkyl radical having 4 to 30 carbon atoms or a fully or partially halogenated alkyl radical having 9 to 30 carbon atoms;X is a halogen or an alkyl radical, optionally halogenated, having 1 to 8 carbon atoms;N is an integer from 0 to 4;M is an integer from 0 to 5, andR.sub.3 and R.sub.4, which may be the same or different, are alkyl radicals, optionally halogenated, having 1 to 30 carbon atoms, with the exception that, when R.sub.1 and R.sub.2 are alkyl radicals, X is bromine and n is 2, R.sub.3 and R.sub.

Abstract: Polymers of styrene or copolymers thereof with monomers copolymerizable therewith are obtained in the form of expandable particles by polymerizing the styrene or mixture of monomers comprising styrene in the presence of an elastomeric olefinic copolymer or terpolymer, incorporating an expanding agent during or after the polymerization, ageing the preexpanded particles, and molding the pre-expanded and aged particles in a pressure-resistant mold which is not gas tight to obtain molded articles having very desirable characteristics.

Abstract: Expandible particles of styrene polymers are prepared by a process in which the polymerization of styrene, or of mixtures of styrene and monomers copolymerizable with it, and/or treatment of the expandible particles prior to expansion thereof, are (is) carried out in the presence of dimers or trimers of unsaturated fatty acids or their esters with C.sub.1 -C.sub.18 alcohols.

Abstract: Expandable thermoplastic polymeric compositions based on styrene polymers and copolymers in the form of fine particles are disclosed. The particulate compositions essentially consist of (a) styrene polymers containing one or more expanding agents; (b) a polyether derived from propylene oxide and, optionally also from ethylene oxide, and containing polyhydroxy compounds, the polyether being homogeneously dispersed on the surface and preferably also within the expandable particles and (c) optionally, in combination with powdered inorganic and/or organic substances which are homogeneously dispersed on the surface of the polymer particles.