Total Research & Technology Feluy

Stéphane Nowe

Philippe Lodefier

Laetitia Urbanczyk

Jacques Michel

Jean-Claude Deleye

Nicolas Lambricht

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:

Expandable vinyl aromatic polymers

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.

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Monein, France

Stéphane Nowe