Process for the preparation of expandable polyvinylarene particles
AssigneeNova Chemical (International) S.A.
InventorsMichel Florentine Jozef Berghmans, Karel Cornelis Bleijenberg, Alphonsus Catharina Gerardus Metsaars
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Abstract
Process for the preparation of expandable polyvinylarene particles in which compact polyvinylarene particles are impregnated by an inorganic N2- and/or O2-containing gas at a temperature below 95° C. and at a pressure of 100 to 2,000 kPa gauge.
Claims11
Process for the preparation of expandable polvinylarene particles in which compact polyvinylarene particles are impregnated by an inorganic compound selected from the group consisting of N2- and/or O2-containing gas at a temperature below 95° C. and at a pressure of 100 to 2,000 kPa gauge.
Process for the preparation of expandable polyvinylarene particles in which compact polyvinylarene particles containing voids are impregnated by exposing said compact polyvinylarene particles to an inorganic compound selected from the group consisting of N2- and/or O2 containing gas and at a temperature below 95° C. and at a pressure of 100 to 2,000 kPa gauge to maintain the structure and properties of said voids in said compact polyvinylarene particles, wherein said inorganic N2- and/or O2 containing gas contains a low volume of organic compounds and wherein said inorganic N2- and/or O2 containing gas, being less soluble in the polymer matrix compared to said organic compounds, remains essentially in said voids of said compact polyvinylarene particles for an expansion of said particles.
Dependencies are inferred from the claim text.