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US 9,868,839 B2Granted
Process for the production of crosslinked PVC foams and compositions used for the embodiment of said process
AssigneeDiab International AB
InventorsRaffaela Bressan, Eva-Lotta Magdalena Petersson
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Abstract
A process for the production of crosslinked PVC foams includes the preparation of a polymeric mixture based on PVC, isocyanate, anhydride, nucleating agent and a physical blowing agent, heating this mixture in a reaction mold, cooling the polymeric mass thus obtained, opening the mold in order to extract the microcellular embryo, and expanding and completing the crosslinking reactions of the embryo in an oven.
Claims4
A process for production of crosslinked PVC foams, comprising:
- preparing a PVC-based polymeric mixture;
- heating the polymeric mixture in a reaction mold under pressure and producing a polymeric mass;
- cooling the polymeric mass thus obtained and producing a microcellular embryo;
- opening the mold and extracting the microcellular embryo;
- and
- expanding said embryo and subsequently completing crosslinking reactions of said embryo,
- wherein the step of preparing the PVC-based polymeric mixture comprises adding, to said PVC-based polymeric mixture, at least one physical blowing agent (PBA), and
- wherein said embryo is cooled, inside the mold, to a minimum temperature higher than a boiling point of said at least one physical blowing agent.
5 more elements
Dependencies are inferred from the claim text.