	US 12,466,768 B2
	Lightweight composite material having a scratch-resistant surface and method for the production thereof
Klaus Holtmann, Amberg (DE); Marco Süss, Bodenwöhr (DE); and Kirstin Heyen, Hahnbach (DE)
Assigned to GEBRÜDER DORFNER GMBH & CO. KAOLIN—UND KRISTALLQUARZSAND-WERKE KG, Hirschau (DE)
Appl. No. 17/612,506
Filed by Gebrüder Dorfner GmbH & Co. Kaolin—und Kristallquarzsand-Werke KG, Hirschau (DE)
PCT Filed Mar. 31, 2020, PCT No. PCT/EP2020/059116 § 371(c)(1), (2) Date Nov. 18, 2021, PCT Pub. No. WO2020/233880, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 10 2019 113 330.0 (DE), filed on May 20, 2019.
Prior Publication US 2022/0212987 A1, Jul. 7, 2022
Int. Cl. C04B 14/16 (2006.01); C04B 14/06 (2006.01); C04B 26/06 (2006.01); C04B 26/16 (2006.01); C04B 26/18 (2006.01); C04B 103/00 (2006.01); C04B 111/00 (2006.01); C04B 111/60 (2006.01)

CPC C04B 14/16 (2013.01) [C04B 14/06 (2013.01); C04B 26/06 (2013.01); C04B 26/16 (2013.01); C04B 26/18 (2013.01); C04B 2103/0043 (2013.01); C04B 2111/00405 (2013.01); C04B 2111/60 (2013.01)]

20 Claims

1. A composite material comprising a binder and at least one first and at least one second filler,

the first filler having a density of >2 kg/l and a Mohs hardness of >4 and

the second filler having a bulk density of <2.5 kg/l, wherein the particles of the second filler are selected from a group consisting of hollow polymer spheres, polymer granules, hollow glass spheres, synthetic porous glass or ceramic spheres, zeolite, aluminium trihydroxide (ATH), expanded perlite, and pumice stone,

wherein the concentration of the first filler in the composite material decreases starting from a first surface of the composite material in the direction of an opposite second surface of the composite material.