Polimeri Europa S.p.a.

Versalis S.p.a.

Alessandra Simonelli

Antonio Ponticiello

Dario Ghidoni

Loris Zamperlin

Alessandro Casalini

Riccardo Felisari

Attilio Arienti

Andrea La Piccirella

Compositions based on self-extinguishing expandable vinyl aromatic polymers in granules comprising: a. a polymeric matrix and, homogeneously englobed in the polymeric matrix, b. 3-10% by weight, calculated with respect to the polymer (a), of an expanding system; c. 0.005-5% by weight, calculated with respect to the polymer (a), of a brominated flame-retardant agent; d. 0.001-2% by weight, calculated with respect to the polymer (a), of a synergic additive; e. 0.005-5% by weight, calculated with respect to the polymer (a), of at least one stabilizing additive selected from: i. pyrophosphates of alkaline or alkaline earth metals, an ammonium group or a unit deriving from melamine; ii. melamine polyphosphate; iii. partially or completely salified polycarboxylic acids; iv. citrates of alkaline or alkaline earth metals; v. polyfunctional alcohols with 2 or more alcohol functions; vi. esters of poly-functional alcohols.

Compositions of self-extinguishing expandable vinyl aromatic (co)polymers and process for their preparation

Process for the preparation of beads of expandable vinyl aromatic polymers by means of polymerization in aqueous suspension, which comprises polymerizing at least one vinyl aromatic monomer in aqueous suspension in the presence of a peroxide initiator system, active at a temperature higher than 800 C, an expanding agent, and in the presence of: &#x2014;an amide having the general formula RCONHCH&#x2014;CHNHCOR(I) a flame retardant system comprising a brominated additive with a bromine content higher than 30% by weight.

Process for the preparation of expandable vinyl aromatic polymers with a reduced thermal conductivity by polymerization in suspension

Expandable particle composite material suitable for the preparation of expanded materials having a density lower than 40 g/l and a content of closed cells of at least 60%, including heterophase cavities and/or heterophase domains, whose matrix is a synthetic thermoplastic resin having at least 60% by weight of a vinyl aromatic polymer and in which an expanding system is contained, together with a heterogeneously distributed graphite material, having a graphitization degree, calculated by means of the Maire and Mering formula, of at least 0.2.

Composite material based on vinylaromatic polymers having enhanced thermal insulation properties and process for the preparation thereof

Process for improving the insulating capacity of expanded vinyl aromatic which includes:

Process for improving the insulating capacity of expanded vinyl aromatic polymers and the products thus obtained

Process for improving the insulating capacity of expanded vinyl aromatic which comprises:

Process or improving the insulating capacity of expanded vinyl aromatic polymers and the products thus obtained

Expandable vinylaromatic polymers which comprise: a) a matrix obtained by polymerizing 50-100% by weight of one or more vinylaromatic monomers and 0-50% by weight of a copolymerizable monomer; b) 1-10% by weight, calculated with respect to the polymer (a) of an expanding agent englobed in the polymeric matrix; c) 0.01-20% by weight, calculated with respect to the polymer (a) of carbon black distributed in the polymeric matrix having an average diameter ranging from 30 to 2000 nm, a surface area ranging from 5 to 40 m/g, a sulfur content ranging from 0.1 to 2000 ppm and an ash content ranging from 0.001 to 1%.

Growing community of inventors

Mantova, Italy

Alessandra Simonelli