Mica-reinforced polyolefin compositions comprising a maleammic silane modifier

Claim 1

Polyolefinic compositions comprising from 30% to 90% by weight of an olefinic homopolymer or copolymer and from 70% to 10% by weight of mica pretreated by the addition on its surface of from 0.01% to 7% by weight, referred to the weight of the mixture of polymer and mica, of at least one compound having the general formula ##STR8## wherein z is an integer equal to 0 or 1; X, when z is 1 is a radical of formula ##STR9## or an aromatic, cycloaliphatic or heterocyclic divalent radical, while when z is 0, X is an aliphatic, aromatic or heterocyclic radical containing a functional, aminic, or epoxy, mercaptan, ester, vinyl or halogen group; R 1 is hydrogen; and Y is a silane group of formula --Si(Z).sub.n in which Z is an alkoxyl hydrolyzable group containing from 1 to 6 carbon atoms; and n is an integer from 1 to 3, extremes included.