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AssigneePolimerplast
InventorsIgor Victorovich Morozov, Lyubov Dmitrievna Strelkova, Yuliya Vladimirovna Razborova, Pyotr Mikhailovich Traskin, German Valeryevich Gordeyev, Valery Innokentyevich Yemelyanov, Valery Iosifovich Kharitonov, Anatoly Fyodorovich Perevalov, Vladimir Yevgenyevich Popov, Vyacheclav Nikolayevich Kovalev
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A foamed polyvinylchloride (PVC) material is produced by mixing of 100 mass parts of PVC with 0.5-5 mass parts of sodium alkyl sulfonate, molding of the obtained composition and followed by heating for foaming at 190.degree.-300.degree. C. for 3-20 mins. Molding is performed either under 0.5-400 MPa and 20.degree.-170.degree. C., followed by heating to 140.degree.-150.degree. C. in the closed space, or in a free state in the form of 2-16 mm thickness layer. In the latter case the layer before foaming can be subjected to packing.
A process for the foamed polyvinylchloride production, which comprises mixing of powder polyvinylchloride with a polar compound additive, molding of the mixture and the following heating, characterized in that suspension or mass polyvinylchloride is mixed with sodium alkyl sulfonate, taken in amount of 0.5-5 mass parts per 100 mass parts of polyvinylchloride, is molded and is heated in a free state at 190.degree.-300.degree. C. for 3-20 mins.
Dependencies are inferred from the claim text.