Abstract: New polymeric compositions comprising:(a) a linear copolymer constituted by four alternating blocks, which can be represented by the formula (I) or (II)B.sub.1 -T-A.sub.1 -B.sub.2 -A.sub.2 (I)orB.sub.1 -A.sub.1 -B.sub.2 -T-A.sub.2 (II)wherein:B.sub.1 and B.sub.2 are polydienic blocks, preferably polybutadienic blocks;A.sub.1 and A.sub.2 are polyvinylaromatic blocks and preferably polystyrenic blocks;T is a portion of random copolymer formed by dienic and vinylaromatic monomer units;(b) a linear copolymer constituted by two blocks, which can be represented by the formulae (III) or (IV)B.sub.3 -T-A.sub.3 (III)orB.sub.3 -A.sub.3 (IV)wherein:B.sub.3 is a polydienic block;A.sub.3 is a polyvinylaromatic block; andT has the above seen meaning.The polymeric composition, which can be blended with polystyrene, can be obtained both by blending the individual components, and by means of novel and original synthesis processes which make it possible both (A) and (B) components to be obtained simultaneously.

Abstract: New polymeric compositions comprising:(a) a linear copolymer constituted by four alternating blocks, which can be represented by the formula (I) or (II)B.sub.1 --T--A.sub.1 --B.sub.2 --A.sub.2 (I)orB.sub.1 --A.sub.1 --B.sub.2 --T--A.sub.2 (II)wherein:B.sub.1 and B.sub.2 are polydienic blocks, preferably polybutadienic blocks;A.sub.1 and A.sub.2 are polyvinylaromatic blocks and preferably polystyrenic blocks;T is a portion of random copolymer formed by dienic and vinylaromatic monomer units;(b) a linear copolymer constituted by two blocks, which can be represented by the formulae (III) or (IV)B.sub.3 --T--A.sub.3 (III)orB.sub.3 --A.sub.3 (IV)wherein:B.sub.3 is a polydienic block;A.sub.3 is a polyvinylaromatic block; andT has the above seen meaning.The polymeric composition, which can be blended with polystyrene, can be obtained both by blending the individual components, and by means of novel and original synthesis processes which make it possible both (A) and (B) components to be obtained simultaneously.

Abstract: Radial and branched block copolymers show a structure: ##STR1## wherein: Z is a radical deriving from a tetrafunctional coupling agent;A is a polystyrene block;B is a polybutadiene blockm, n, p, q are either 1 or zero, with the condition that their sum is comprised within the range of from 1 to 4.Compositions of block copolymers comprise the hereinabove disclosed radial and branched block copolymers, blended with a two-block copolymer B-A, and an "A" homopolymer.The process for the preparation of said radial and branched block copolymers and of the related compositions is disclosed, and furthermore their use is disclosed in bituminous compositions, in order to improve the general characteristics of the bitumens.

Abstract: Vulcanized composite materials with an elastomeric, polyacrylic matrix and containing ferrite in the form of finely dispersed particles, which materials are endowed with physical and technological characteristics which make them suitable for the production of manufactured articles destined to the flooring of civil premises, of industrial premises, as well as of all of those premises which are designed to withstand conditions of intense traffic of both pedestrians and mechanical vehicles.

Abstract: Linear copolymers with four alternating blocks, represented by the following formula:B.sub.1 -T-A.sub.1 -B.sub.2 -A.sub.2where: A.sub.1 and A.sub.2 are polyvinylaromatic blocks, B.sub.1 and B.sub.2 are blocks consisting of ethylene-butene-1 or ethylene-propylene copolymers, and T is a statistical terpolymer segment formed from ethylene-propylene-vinylarene or ethylene-butene-1-vinylarene monomer units.The copolymers are characterized by a weight-average molecular weight of between 20,000 and 300,000 and a total content of vinylaromatic units of between 10 and 60% by weight. The ratio of the weight-average molecular weight of block A.sub.1 to that of block A.sub.2 is a number between 0.25 and 2.0, and the ratio of the weight-average molecular weight of block B.sub.1 to that of block B.sub.2 is a number between 0.05 and 0.5.

Abstract: The processability of a polybutadiene with a high content of 1,4-cis-structure is improved by means of the addition of PCl.sub.3 before the polymerization reaction is quenched and when Mooney viscosity of polybutadiene has reached a prefixed value, preferably lower than, or equal to 30; the polymerization of butadiene is carried out in a solution in an aliphatic or cycloaliphatic solvent, in the presence of a catalytic system based on rare earths, preferably a neodymium-based catalytic system.

Abstract: A linear copolymer constituted by four alternating blocks:B1-A1-B2-A2wherein:B1 and B2 are polydienic blocks, and preferably polybutadiene blocks, andA1 and A2 are polyvinylaromatic, and preferably polystyrene blocks;which polymer has a weight average molecular weight of from 30,000 to 250,000, and a global content of monomer dienic units of from 40 to 80% by weight, wherein the weight average molecular weight of B1 block is comprised within the range of from 0.1 to 0.5 times the weight average molecular weight of B2 block, and the weight average molecular weight of A1 block is comprised within the range of from 0.25 to 2.0 times the weight average molecular weight of A2 block, and which contains between B1 and A1 blocks a copolymeric moiety formed by randomly linked monomer dienic and vinylaromatic units; is endowed with a desired balance of mechanical characteristics, rheologic characterisatics and characteristics of thermooxidative resistance.The process to prepare such a block copolymer is disclosed.

Abstract: New decapeptides having hypotensive action are disclosed, which can be defined by the formula:GLp-Leu-Trp-Pro-X-Pro-Y-Z-Pro-Pro-OH (I)wherein:X=Arg or OrnY=His or GlnZ=Ile or Valwith the following limitations:whenX=Arg:Y=HisZ=Val;whenX=Orn:Y=GlnZ=Ile;or, whenX=Orn:Y=HisZ=Valand pharmaceutically acceptable salts, amides of alkyl esters thereof.

Abstract: A reactor for carrying out polymerizations in systems with high concentration of polymer is constituted by a cylindrical body having vertical axis with upper and lower heads; in correspondence of a generatrix of the cylinder an opening with vertical-axis is provided, which puts the interior of the cylinder in communication with the body of an extruder, it too with vertical axis, and solid with the reactor.

Abstract: This invention concerns the production of 1,4-cis polybutadiene, or copolymers of butadiene with other related diolefins, through the catalytic polymerization or copolymerization of butadiene monomer by a continuous or discontinuous process carried out in the absence or substantial absence of solvents or diluents and operating in the presence of solid bodies.

Abstract: Coupling agents suitable to be synthetized by cyclo-oligomerization of 3-methylbutyn-1-ol-3 with subsequent dehydration of the alcohol compounds, and their use in a method for the termination of living polymers obtained by means of the anionic polymerization of diene and/or vinylaromatic monomers.

Abstract: The invention relates to a continuous process for the manufacture of butyl rubber in which the monomers are polymerized using a halogenated polymerization medium in a self-cleaning screw extruder at a constant pressure under boiling plug-flow conditions by means of a modified aluminium halide catalyst which operates at high temperature (relative to prior art very low temperatures of e.g. -100.degree. C.). In contrast to prior art slurry processes, the polymerization mixture forms a sticky, highly viscous mass which is conveyed by screw action to the extruder outlet as polymerization proceeds. The butyl rubber product is separated at a high concentration from vapors of unreacted monomers and polymerization medium which are recycled.

Abstract: This invention concerns the production of 1,4-cis polybutadiene or copolymers of butadiene with other related diolefins through the catalytic polymerization or copolymerization of butadiene monomer by a continuous or discontinuous process carried out in the absence or substantial absence of solvents or diluents, operating in two successive phases (the first at a T<30.degree. C. and the second at a T=or>30.degree. C.) by control of the molecular weights.

Abstract: The present invention relates to the production of 1,4-cis-polybutadiene and of copolymers of butadiene with other conjugated diolefins, by means of the catalytic polymerization or copolymerization of monomer butadiene, by an either continuous or batch process, operating in the presence or in the absence of diluents, and carrying out a portionwise addition, during the polymerization, of a portion of the organometallic compound of aluminum (or of the related hydride derivative), constituiting also one of catalytic components.

Abstract: Isoprene polymers and copolymers are prepared by a polymerization process carried out in the absence of solvents and in the presence of a catalytic system comprising (a) at least one element or compound of an element pertaining to Group IIIB of the Periodic Table, (b) at least one aluminium alkyl derivative, (c) at least one organic halogen derivative or at least one halide of an element able to exist in at least two valency states with the halide corresponding to a higher state than the minimum, or at least one halogen or at least one hydrogen halide acid, (d) at least one compound containing one or more hydroxyl groups of which the hydrogen can be substituted, the ratio of component (b) to component (a) being equal to or less than 20.

Abstract: Multifunctional anionic initiators of the general formula ##STR1## Process for their synthesis, and use of them in polymerization processes.