Composition constituting the surface layer of a sheet type plastic body for covering purposes and process for manufacturing the sheet type plastic bodies containing it

The invention relates to a composition constituting a surface layer applied on a sheet type plastic base body optionally constituted by a support and one or more polymer based films, which composition consists of a mixture of soft polyvinyl chloride with additives, polymers and optionally of inorganic filler material. The composition is characterized by that it contains the following components: a) One or more polymers advantageously vinylidene chloride copolymer or ethylene vinylacetate copolymer having glass transition temperature (Tg) lower by 15 to 42 °C than T g of the polymer in the upper layer of the sheet type plastic body, b) One or more polymers advantageously a polyvinyl chloride based mixture or a polyvinyl chloride vinyl acetate copolymer based mixture having T g higher by 25 to 45 °C than T g of the of the polymer in the upper layer of the sheet type plastic body, c) One or more polymers advantageously methyl-methacrylate copolymer having T g higher by at least 70 °C than T g of the polymer in the upper layer of the sheet type plastic body and optionally d) a powdered inorganic filler material. The invention relates also to a process for manufacturing a sheet type plastic body applicable for covering purposes containing the above mentioned composition as microheterogeneous surface layer of even thickness applied onto a sheet type plastic body optionally containing a support and one or more polymer based films. The process is characterized by that the above mentioned composition is layered in one or more stages onto the heat treated form stable sheet type plastic body constituting the base, the layer is heat treated in at least three stages optionally applying simultaneously pressure.