Composite dielectric material composition, and film, substrate, electronic part and molded article produced therefrom

A composite dielectric material composition comprising a heat-resistant, low-dielectric polymeric material (I) that is a resin composition comprising one or two or more resins having a weight-average absolute molecular weight of at least 1,000, wherein the sum of carbon atoms and hydrogen atoms in all of said resins in said dielectric material composition is at least 99% of the total number of atoms in all of said resins, and a filler (II), wherein said heat-resistant, low-dielectric polymeric material is a copolymer in which a non-polar α-olefin base (co)polymer segment and/or a non-polar conjugated diene base (co)polymer segment are chemically combined with a vinyl aromatic (co)polymer segment containing a monomer of divinylbenzene, and is a thermoplastic resin which shows a multi-phase structure wherein a dispersion phase formed by one segment is finely dispersed in a continuous phase formed by another segment,

• and wherein said heat-resistant, low-dielectric polymeric material in pulverized form is insoluble in xylene of 120° C.