Versalis S.p.a.

Polimeri Europa S.p.a.

Enichem S.p.a

Ecp Enichem Polimeri S.r.l.

Aldo Longo

Giuditta Vannucci

Alessandro Casalini

Nicoletta Cardi

Leonardo Chiezzi

Giuliana Schimperna

Riccardo Po'

Italo Borghi

Dario Ghidoni

Gian C Fasulo

Maria Caldararo

Martino Colonna

Riccardo Po

Riccardo Felisari

Antonio Ponticiello

Attilio Arienti

Olga Valentino

Luca Monti

Giovanni Cuder

Angelo Ferrando

Gino Goffredi

Stefano Comba

Franco Ghelfi

Mirco Nodari

Dino Ferri

Roberto Lanfredi

Mirko Buffagni

Andrea Callaioli

Claudio Gioia

The present invention relates to a polymerization process for the synthesis of vinyl aromatic polymers, in which the sequence of monomers in the chain and the linear, branched soluble, or crosslinked insoluble structure, with reactive or different polarity functions, are controlled. Said process comprises the step of polymerizing vinyl aromatic monomers by means of an Atom Transfer Radical Polymerization (ATRP) reaction with an Activator ReGenerated by Electron Transfer (ARGET), the reaction being carried out at a temperature comprised between 25&#xb0; C. and 110&#xb0; C. in an inert gas atmosphere in the presence of a complex catalyst containing a cupric halide and a multidentate amine ligand, feeding to the reaction an organic initiator having two geminal halogens, an alkali metal (bi)carbonate, a solvent pair of an aliphatic alcohol and an acetic ester of the same aliphatic alcohol and possibly ascorbic acid, provided that no initiator is used with three or more active halogens, or polyvinyl monomers or inimers.

Polymerization process for the synthesis of vinyl aromatic polymers with a controlled structure

A method for synthesizing regioregular polyesters, starting from asymmetric diols, may provide the polymer ordered structure and advantageous physical-chemical properties. Such methods can make it is possible to obtain regioregular polyesters having high glass transition temperatures Tand crystalline properties. In the case in which the asymmetric diols are used in a pure enantiomeric form, with respect to the chiral carbon bound to the secondary hydroxyl, through the above-mentioned method it is possible to obtain regioregular and stereoregular polyesters, which may have thermal and crystalline properties further ameliorative with respect to non-chiral regioregular polymers.

Method of regioselective synthesis of polyesters from asymmetric diols

The present invention relates to polymeric compositions that can be used for producing packaging with dynamic cushioning, with a pleasant touch, with reduced abrasive power, in which the expanded particles constituting the packaging adhere well to one another and do not come detached during use. Said compositions comprise: a) from 70% to 90% by weight of a vinyl aromatic polymer and/or copolymer, calculated with respect to (a)+(b); b) from 10% to 30% by weight of an ethylene-vinyl acetate copolymer (EVA) containing a percentage that ranges from 10% to 30% by weight of vinyl acetate, calculated with respect to (a)+(b); c) from 3 to 10 parts by weight of a blowing agent, calculated on 100 parts of component a) added to component b); said copolymer (b) being distributed in the polymer (a) in the form of particles having an average volumetric diameter ranging from 1 nm to 2000 nm. The compositions described and claimed do not include styrene-butadiene or styrene-isoprene block copolymers, hydrogenated or non-hydrogenated; thermoplastic polyurethanes, polystyrene-butadiene grafted polymers or styrene core-shell polymers.

Expandable vinyl aromatic composition containing functionalized ethylene-vinyl acetate copolymer

The application relates to an expandable polymeric composition with an enhanced processability, which comprises a polymeric base, an expanding agent, and an additive with a plasticizing effect; said polymeric composition being characterized in that:

Expandable vinyl aromatic polymeric compositions

The present invention relates to vinyl polymers having certain characteristics which confer flame-retardant properties to the polymer and their polymeric compositions with other vinyl polymers.

Vinyl polymers having a flame-retardant function

The present invention relates to a self-extinguishing polymeric composition comprising: a) a stabilizing polymeric composition containing i) from 80% to 99.5% by weight of one or more vinylaromatic polymers compatible with each other; and ii) from 0.5% to 20% by weight of at least one block copolymer containing: 1) at least one vinylaromatic polymer block compatible N with (i) and constituting a weight quantity equal to or higher than 15% by weight with respect to the whole block copolymer, and 2) at least one vinyl copolymer block containing epoxy groups so that there is from 0.7% to 19% by weight of oxirane oxygen calculated on the total of block copolymer; and b) from 0.03 phr by weight to 10 phr by weight, calculated on the basis of component (a), of at least one halogenated flame retardant.

Self-extinguishing polymeric composition

A cationic polymerization process for the synthesis of nano-structured polymers containing graphene which comprises reacting graphite oxide dispersed in a solvent by means of ultrasounds, with at least one vinyl monomer and at least one vinyl aromatic monomer, in the presence of at least one strong inorganic acid and suitable for activating a cationic polymerization, wherein: &#x2014;said graphite oxide contains from 5% to 60% by weight of bound oxygen, &#x2014;said vinyl monomer contains at least one carboxylic group wherein the ratio between oxygen bound to the oxide and carboxylic groups ranges from 1:10 to 10:1 in moles per mole, and&#x2014;the ratio between said vinyl aromatic monomer and the sum of the quantity of graphite oxide and vinyl monomer containing carboxylic groups ranges from 50% to 99% by weight.

Cationic polymerization process for the synthesis of nano-structured polymers containing graphene

A process for the preparation of vinylaromatic (co)polymers grafted on an elastomer comprising a rigid matrix consisting of vinylaromatic polymers or copolymers and of an elastomeric phase dispersed in the matrix in form of particles with a strictly bimodal distribution which comprises the functionalization of a first elastomeric fraction by means of a catalytic system containing a stable free radical initiator and subsequently the polymerization of the thus obtained mixture also in presence of a second non functionalized elastomeric fraction.

Process for the preparation of high impact vinylaromatic (co)polymers grafted on an elastomer

A process for the preparation of vinylaromatic (co)polymers grafted on an elastomer in a controlled way, comprising the dissolving of an elastomer, such as polibutadiene, in a mixture consisting of a monomer and of a solvent in the presence of a polymerization catalytic system, which comprises an initiator of free radicals and a stable initiator of free radicals. The mixture obtained in this way is heated to a temperature of about 100&#xb0; C. to functionalize the rubber, then more monomer is added and the temperature is raised to start the polymerization reaction.

Process for the preparation of vinylaromatic (co)polymers grafted on an elastomer in a controlled way

Process for the preparation of block copolymers, based on vinylaromatic monomers and monomers deriving from (meth)acrylic acid by means of radicalic polymerization which comprises polymerizing the monomers at a temperature higher than or equal to 120&#xb0; C., in the presence of a radicalic initiating system comprising a compound having general Formula (I) 

Process for the preparation of block copolymers

Mass-continuous process for the production of vinylaromatic polymers which comprises feeding a reaction mixture containing at least one vinylaromatic monomer to at least one tubular reactor of the PFR type and operating with a recycling ratio, referring to the recycling flow-rate/feeding flow-rate, of less than 4.

Process for the production of vinylaromatic polymers, optionally containing an ethylenically unsaturated nitrile

Polymeric compositions

A thermoplastic composition based on a polyolefin and a vinyl aromatic polymer, having an improved combination of physical, mechanical and thermal properties, comprising:

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Aldo Longo