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Molding materials containing (a) optionally thermoplastic(s), (b) amorphous polyolefin radically grafted with a silane containing olefinic double bond(s) and 1-3 alkoxy groups directly attached to silicon, and (c) a reinforcing agent, not including materials in which less than 28 parts barium sulfate to 100 parts (a + b) is used as component (c). Molding materials contain: (a) 0-98 wt.% of one or more thermoplastics, (b) 2-100 wt.% essentially amorphous polyolefin radically grafted with a silane containing olefinic double bond(s) and 1-3 alkoxy groups directly attached to silicon, to give a grafted polyolefin with a melt viscosity of 100-50,000 mPa.s at 190 degrees C, and (c) 0.5-400 parts weight (pts. wt.) reinforcing agent to 100 pts. wt. (a) + (b), but not including such materials in which less than 28 pts. wt. barium sulfate is used as the reinforcing agent. An Independent claim is also included for the production of these materials comprising (1) incorporating additive (c) into a melt of the grafted polymer (b), or (2) incorporating (c) into a melt of the amorphous polyolefin and then grafting by adding the unsaturated silane and a radical source, or (3) mixing the compositions obtained in (1) or (2) with component (a), and/or (4) crosslinking the silane-grafted polyolefin (b) in the mixture.