COMPOSITE MATERIAL BASED ON VINYLAROMATIC POLYMERS HAVING ENHANCED THERMAL INSULATION PROPERTIES AND PROCESS FOR THE PREPARATION THEREOF
First Claim
1. An expandable granular composite material having a polymeric matrix suitable for preparing expanded articles having a density lower than 40 g/l and a content of closed cells of at least 60% as determined according to ASTM D-2856 comprising heterophase domains including materials not completely miscible with said polymeric matrix, and/or cavities, embedded inside the polymeric matrix, wherein said polymeric matrix is a thermoplastic synthetic polymer having at least 60% by weight, with respect to the overall weight of the matrix, of a polymer deriving from a vinyl aromatic polymer, wherein said composite material contains an expanding system and graphite material not homogeneously distributed, having a graphitization degree, calculated by the Maire and Mering formula, of at least 0.2.
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Abstract
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.
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36 Claims
- 1. An expandable granular composite material having a polymeric matrix suitable for preparing expanded articles having a density lower than 40 g/l and a content of closed cells of at least 60% as determined according to ASTM D-2856 comprising heterophase domains including materials not completely miscible with said polymeric matrix, and/or cavities, embedded inside the polymeric matrix, wherein said polymeric matrix is a thermoplastic synthetic polymer having at least 60% by weight, with respect to the overall weight of the matrix, of a polymer deriving from a vinyl aromatic polymer, wherein said composite material contains an expanding system and graphite material not homogeneously distributed, having a graphitization degree, calculated by the Maire and Mering formula, of at least 0.2.
Specification