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The present invention provides a sheet structure comprising a carrier layer and a foamed cover layer which contains polyvinyl chloride, lignocellulosic based components and hollow microspheres, and a method for producing the sheet structure. The sheet structure can be used as an artificial leather, e.g. for flexible automotive interiors.

Titel:	SHEET STRUCTURES CONTAINING NATURAL POLYMERS AND MICROSPHERES
Link:	Zum Volltext
Veröffentlichung:	2022
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20220025576 Publication Date: January 27, 2022 Appl. No: 17/312033 Application Filed: December 02, 2019 Assignees: TMG - Tecidos Plastificados e Outros Revestimentos Para a Indústria Automóvel, S.A. (S. Cosme do Vale, V.N. Famalicão, PT) Claim: 1. A sheet structure comprising a carrier layer and a foamed cover layer which contains polyvinyl chloride, lignocellulosic based components and hollow microspheres, wherein the density of the foamed cover layer is less than 1500 kg/m3. Claim: 2. The sheet structure according to claim 1, wherein the carrier layer is a textile layer. Claim: 3. The sheet structure according to claim 1, wherein the lignocellulosic based components are fibers or particles. Claim: 4. The sheet structure according claim 1, wherein the density of the foamed cover layer is less than 1000 kg/m3. Claim: 5. The sheet structure according to claim 1, wherein the hollow microspheres have been thermally expanded. Claim: 6. The sheet structure according to claim 1, wherein the foamed cover layer does not contain any chemical foaming agent. Claim: 7. The sheet structure according to claim 1, wherein the hollow microspheres make up 15 to 90 vol % of the total volume of the foamed cover layer. Claim: 8. The sheet structure according to claim 1, wherein at least one modification has been carried out selected from the group consisting of a chemical modification of the lignocellulosic based components to decrease their hydrophilicity and a chemical modification of the polyvinyl chloride to increase its hydrophilicity. Claim: 9. The sheet structure according to claim 1, wherein the carrier layer has a thickness of 0.1 to 3.0 mm and a foamed cover layer has a thickness of 0.2 to 5.0 mm. Claim: 10. The sheet structure according to claim 1, wherein the foamed cover layer contains 10 to 45 vol % of polyvinyl chloride, 20 to 70 vol % of lignocellulosic based components and 5 to 65 vol % of hollow microspheres, wherein the polyvinylchloride, the lignocellulosic based components and the hollow microspheres make up 70 to 100 vol % of the total volume of the foamed cover layer. Claim: 11. The sheet structure according to claim 1, which is an artificial leather having a grained surface structure. Claim: 12. A process for preparing a sheet structure comprising the following steps: (a) providing a mixture of lignocellulosic based components, microspheres, and molten polyvinyl chloride, (b) heating the mixture to expand the microspheres, (c) applying the product of step (b) on a carrier layer, and (d) cooling the product of step (c) to obtain the sheet structure. Claim: 13. The process according to claim 12, wherein the mixture of step (a) is provided by mixing a prepaste containing polyvinyl chloride and microspheres with lignocellulosic based components or a pre-paste containing lignocellulosic based components. Claim: 14. A sheet structure obtainable by a process described in claim 12. Claim: 15. The use of a sheet structure according to claim 1 as an artificial leather. Current International Class: 06; 32; 32; 06; 06

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SHEET STRUCTURES CONTAINING NATURAL POLYMERS AND MICROSPHERES