Composition of electrically insulating, thermally conductive polymeric resin, based on styrenic compounds with balanced properties

摘要

A thermoconductive polymer (TCP) resin composition (i) or (ii) comprising components (I) and (II): (i) from 40 to 72% by volume of at least one matrix polymer (I) as component (I); 28 to 60% by volume of a heat-conducting filler (II) as component (II) having a weight average particle diameter (D50) of 0.1 to 200 μm, consisting of at least one aluminosilicate as component (II-1) combined with at least one additional component (II-2) selected from the group consisting of: multi-walled carbon nanotubes, graphite and boron nitride, where the volume ratio between components (II-1) and (II-2) is from 30: 1 to 0.1: 1; or (ii) from 40 to 65% by volume of at least one matrix polymer (I) as component (I); 35 to 60% by volume of a heat conductive filler (II) as component (II) having a weight average particle diameter (D50) of 0.1 to 200 µm consisting of at least one aluminosilicate; wherein the matrix polymer (I) comprises styrenic polymers (I ') selected from the group consisting of: ABS resins (acrylonitrile-butadiene-styrene), ASA resins (acrylonitrile-styrene-acrylate) and elastomeric block copolymers of structure (S - (B / S)) nS where S is a vinyl aromatic block that forms a hard phase, (B / S) is a random copolymer block of vinyl aromatic monomer and a conjugated diene that forms a soft phase, and n are natural numbers of 1 to 10, wherein the elastomeric block copolymer has a monomer composition comprising 25 to 60% by weight (based on the elastomeric block copolymer) of diene and 75 to 40% by weight (based on the copolymer in elastomeric block) of vinyl aromatic compound, the glass transition temperature Tg of block S is higher than 25 ° C and that of block (B / S) is lower than 25 ° C, and the proportion of the hard phase in the block copolymer elastomeric is 5 to 40% by weight and the relative amount of bonds 1,2 of the polydiene, based on the sum of 1,2 and 1,4 cis / trans bonds, is less than 15%; and wherein the sum of components (I) and (II) total 100% by volume, and wherein the surface of the aluminosilicate is treated with a coupling agent.