Expandable Granulates Based on Vinyl-Aromatic Polymers Having an Improved Expandability and Process For the Preparation Thereof
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United States of America Patent
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Issued Date -
Oct 9, 2008
app pub date -
Oct 18, 2006
filing date -
Oct 18, 2005
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Abandoned
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Abstract
Expandable granulates having a composition based on vinyl-aromatic polymers, essentially consisting of: 65-99.8% by weight of a copolymer obtained by polymerizing85-100% by weight of one or more vinyl-aromatic monomers having general formula (I) and 0.15% by weight of an alpha-alkylstyrene;0-25% by weight, calculated with respect to the polymer (a), of carbon black;at least one of the following products: 0.01-5% by weight of graphite having an average diameter ranging from 0.5 to 50 .mu.m; 0.01-5% by weight of oxides and/or sulfates and/or lamellar dichalcogenides of metals of groups IIA, IIIA, IIIB, IVB or VIIIB, 0.01-5% by weight of inorganic derivatives of silicon of the lamellar type;0-5% by weight, calculated with respect to the polymer (a), of a nucleating agent;1-6% by weight, calculated with respect to the total, of an expanding agent.
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