Total Research & Technology Feluy

Totalenergies Onetech Belgium

Laetitia Urbanczyk

Philippe Lodefier

Jacques Michel

Jean-Claude Deleye

Stéphane Nowe

Martine Slawinski

Armelle Sigwald

Pascal Charlier

Serge Eon

Thierry Marcoux

Antonio Guinovart

Matthieu Adam-Berret

Jose-Maria Pere

Elodie Perche

Nicolas Lambricht

Stephane Nowe

Michel Cassart

Magali Vachaudez

Amelio Iacolina

José-Maria Pere

The present invention is related to expandable vinyl aromatic polymers comprising comminuted coke, said comminuted coke having an average stack height (Lc) of carbon crystallites at least 4 nm, a volume median particle diameter (D50) comprised between 1 and less than 5 &#x3bc;m and being characterized by a span (D90&#x2212;D10)/D50 below 2.5 Molded parts produced from the expandable vinyl aromatic polymers prove low thermal conductivities for a low foam density.

Expandable vinyl aromatic polymers

The invention relates to a process and an installation to produce a monovinylaromatic polymer (3) comprising post-consumer recycled polystyrene (PCR-PS) wherein the process comprises the steps of mixing the PCR-PS (5) and the monovinylaromatic monomer (7) within a dissolver (9) to dissolve the PCR-PS (5) in the monovinylaromatic monomer (7) so as to produce a polymerization mixture (13); and a step of filtering the polymerization mixture (13) that includes continuously redirecting at least a part of the stream of the filtered polymerization mixture (17) back to the dissolver (9) and mixing it with the polymerization mixture (13) so as to continuously reduce the content of insoluble material in the polymerization mixture (13) contained in the dissolver (9).

Process for producing monovinylaromatic polymer incorporating post-consumer recycled polystyrene, monovinylaromatic polymer incorporating post-consumer recycled polystyrene and articles produced thereof

The invention relates to a process and an installation to produce a monovinylaromatic polymer () comprising post-consumer recycled polystyrene (PCR-PS) wherein the process comprises the steps of mixing the PCR-PS () and the monovinylaromatic monomer () within a dissolver () to dissolve the PCR-PS () in the monovinylaromatic monomer () so as to produce a polymerization mixture (); and a step of filtering the polymerization mixture () that includes continuously redirecting at least a part of the stream of the filtered polymerization mixture () back to the dissolver () and mixing it with the polymerization mixture () so as to continuously reduce the content of insoluble material in the polymerization mixture () contained in the dissolver ().

Expandable vinyl aromatic polymers may contain comminuted graphite with a polymodal particle size distribution. Foams obtained from such expandable vinyl aromatic polymers have a reduced thermal conductivity at a reduced foam density.

Expandable vinyl aromatic polymers containing graphite particles having a polymodal particle size distribution

Expandable vinyl aromatic polymers may contain comminuted needle petroleum coke with a polymodal particle size distribution. Foams obtained from such expandable vinyl aromatic polymers have a reduced thermal conductivity at a reduced foam density.

Expandable vinyl aromatic polymers comprising platelet needle coke particles

The present invention discloses an expandable vinyl aromatic polymer comprising:

An expandable vinyl aromatic polymer may include a matrix of a vinyl aromatic polymer, 1-10% of an expanding agent, 0.1 to 5% talc, carbon black, and 0 to 20% fillers. The expanding agent may be englobed in the matrix. The talc may have a mean diameter above about 8 &#x3bc;m as measured by Laser Mastersizer according to standard ISO 13320-1. The BET of the talc may be in the range 0.5-25 m/g. The carbon black may be present in a proportion sufficient for a foamed material obtained from the expandable vinyl aromatic polymer to have a thermal conductivity &#x3bb; of about 34 mW/m&#xb0; K or lower. The fillers may be homogeneously distributed in the matrix.

Growing community of inventors

La Louvière, Belgium

Laetitia Urbanczyk