Component parts produced by thermoplastic processing of polymer/boron nitride compounds, polymer/boron nitride compounds for producing such component parts, method for producing such component parts and use thereof

A method for producing a component part, the component part having a wall thickness of at most 3 mm on at least one part of the component part, comprising injection molding a compound at a melt temperature, the compound comprising a thermoplastically processable polymer material and platelet-shaped hexagonal boron nitride particles, at an injection rate of at most 200 mm/s;

• wherein
• the polymer/boron nitride compound contains no glass fibers;
• the melt temperature of the compound during the injection molding is at least 10° C. and at most 60° C. higher than the melting temperature of the polymer material without heat-conducting filler;
• and either
• (a) (i) the injection molding takes place at a mold temperature of at least 30° C. and at most 120° C. lower than the heat deflection temperature of the polymer material without heat-conducting filler, as measured at 0.45 MPa according to DIN EN ISO 75-1/-2, and
• (ii) the through-plane thermal conductivity of the component part is at least 1 W/m*K and less than 2.5 W/m*K as measured according to DIN EN ISO 22007-4 on disk-shaped injection-molded samples having a thickness of 2 mm;
• or
• (b) (iii) the injection molding takes place at a mold temperature of at least 5° C. and at most 70° C. lower than the heat deflection temperature of the thermoplastically processable polymer without heat-conducting filler, as measured at 0.45 MPa according to DIN EN ISO 75-1/-2, and
• (iv) the through-plane thermal conductivity of the component part is at least 2.5 W/m*K as measured according to DIN EN ISO 22007-4 on disk-shaped injection-molded samples having a thickness of 2 mm.