Abstract: Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or co-polymers of conjugated dienes; or—hydrogenated co-polymers of said conjugated dienes and monoalkenyl arenes, and—mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.

Abstract: Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or co-polymers of conjugated dienes; or —hydrogenated co-polymers of said conjugated dienes and monoalkenyl arenes, and —mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.

Abstract: Process for the purification of the solvent deriving from the production of an elastomeric blend comprising the following steps: (a) optionally, subjecting said solvent to a pre-washing (2) in the presence of at least one acid or basic aqueous solution; (b) feeding said solvent to a liquid-liquid separation column (7); (c) feeding the stream leaving the head of said liquid-liquid separation column (7) to an azeotropic distillation column (21); (d) feeding the stream withdrawn laterally (side-withdrawal) from said azeotropic distillation column (21) to an adsorption section (34a/b); Said process allows to obtain a polymer grade solvent having a quality suitable for being used indifferently and contemporaneously in various types of production plants of elastomeric (co)polymers, i.e. in plants wherein an anionic (co)polymerization is carried out, and also in plants wherein a Ziegler-Natta (co)polymerization is carried out.

Abstract: Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or co-polymers of conjugated dienes; or —hydrogenated co-polymers of said conjugated dienes and monoalkenyl arenes, and —mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.

Abstract: Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or copolymers of conjugated dienes; or —hydrogenated copolymers of said conjugated dienes and monoalkenyl arenes, and —mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.

Abstract: Process for the purification of the solvent deriving from the production of an elastomeric blend comprising the following steps: .(a) optionally, subjecting said solvent to a pre-washing (2) in the presence of at least one acid or basic aqueous solution; .(b) feeding said solvent to a liquid-liquid separation column (7); .(c) feeding the stream leaving the head of said liquid-liquid separation column (7) to an azeotropic distillation column (21); .(d) feeding the stream withdrawn laterally (side-withdrawal) from said azeotropic distillation column (21) to an adsorption section (34a/b); Said process allows to obtain a polymer grade solvent having a quality suitable for being used indifferently and contemporaneously in various types of production plants of elastomeric (co)polymers, i.e. in plants wherein an anionic (co)polymerization is carried out, and also in plants wherein a Ziegler-Natta (co)polymerization is carried out.

Abstract: Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or copolymers of conjugated dienes; or —hydrogenated copolymers of said conjugated dienes and monoalkenyl arenes, and —mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.

Abstract: Process for the selective hydrogenation of double olefinic bonds present in polymers and copolymers of conjugated dienes, which comprises: (a) preparation of a hydrocarbon solution of the (co)polymer to be hydrogenated, optionally containing a modifier (C); (b) addition to the above solution of the (co)polymer to be hydrogenated of a catalytic solution formed “in situ” comprising: (b1) at least one bis-(cyclopentadienyl)titanium derivative having general formula (I) (C5H5)2Ti (R) (R1), wherein R and R1, the same or different, are halogens, preferably R?R1?Cl; the above compound (I) being dispersed in one or more non-solvent diluents; (b2) at least one organo-derivative having general formula (II) M(R2)(R3), wherein M is selected from zinc and magnesium, and R2 and R3, the same or different, are selected from C1-C16 alkyls, preferably C1-C8; (b3) at least one modifier (C); the above selective hydrogenation being carried out in a hydrogen atmosphere until the disappearance of the double olefinic bonds.

Abstract: Process for the selective hydrogenation of double olefinic bonds present in polymers and copolymers of conjugated dienes, which comprises: (a) preparation of a hydrocarbon solution of the (co)polymer to be hydrogenated, optionally containing a modifier (C); (b) addition to the above solution of the (co)polymer to be hydrogenated of a catalytic solution formed “in situ” comprising: (b1) at least one bis-(cyclopentadienyl)titanium derivative having general formula (I) (C5H5)2Ti(R) (R1), wherein R and R1, the same or different, are halogens, preferably R?R1?Cl; the above compound (I) being dispersed in one or more non-solvent diluents; (b2) at least one organo-derivative having general formula (II) M(R2)(R3), wherein M is selected from zinc and magnesium, and R2 and R3, the same or different, are selected from C1-C16 alkyls, preferably C1-C8; (b3) at least one modifier (C); the above selective hydrogenation being carried out in a hydrogen atmosphere until the disappearance of the double olefinic bonds.

Abstract: High transparency polymeric composition essentially consisting of: (1) from 30 to 95% of polystyrene; (2) from 70% to 5% of a composition of vinylarene-conjugated diene block copolymers; the percentage sum of (1) and (2) being equal to 100; the composition (2) consisting of: (2a) from 30 to 60% by weight of copolymers with a linear structure (2b) from 70% to 40% by weight of copolymers with a branched structure; the weight average molecular weight of the above composition (2) ranging from 30,000 to 400,000, preferably from 50,000 to 200,000.

Abstract: High transparency polymeric composition essentially consisting of:

Abstract: Composition of vinylarene/hydrogenated diene block copolymers, the latter being selected from ethylene-butene and ethylene-propylene, characterized in that it comprises: a) copolymers having linear structures from 30% to 60% by weight, preferably from 35% to 50%; b) copolymers having branched structures from 70% to 40% by weight, preferably from 65% to 50%; the sum of components (a) and (b) being equal to 100; the weight average molecular weight of the above composition ranging from 30,000 to 400,000, preferably from 50,000 to 200,000.

Abstract: Catalytic composition effective in the hydrogenation of olefinic double bonds prepared by reaction between: (A) at least one cyclopentadienyl complex of a transition metal having general formula (I) (R)(R1)M1(R2)(R3) wherein R is an anion containing an &eegr;5-cyclopentadienyl ring coordinated to M1; M1 is selected from titanium, zirconium and hafnium; R2 and R3, the same or different, are organic or inorganic anion groups bound to M1; R1 is selected from cyclopentadienyl and R2; (B) an alkylating composition essentially consisting of: (b1) an organometallic compound having general formula (II) M2 (R4)(R5), wherein M2 is selected from Zn and Mg; (b2) an organoderivative of aluminum having general formula (III) Al(R6)3.

Abstract: Catalytic composition effective in the selective hydrogenation of olefinic double bonds prepared by the reaction between:(A) at least one bis(cyclopentadienyl)Titanium derivative having the general formula (I) (C.sub.5 H.sub.5).sub.2 Ti(R) (R.sub.1) wherein R and R.sub.1, the same or different, are halogens; the above compound (I) being solid or dispersed in one or more non-solvent diluents;(B) at least one organo derivative having general formula (II) M(R.sub.2) (R.sub.3) wherein M is selected from Zinc and Magnesium, and R.sub.2 and R.sub.3, the same or different, are selected from C.sub.1 -C.sub.16 alkyls;(C) at least one modifier.