US 12,084,573 B2
Polyamide molding compound with low dielectric loss factor
Doris Abt, Chur (CH); Georg Stoeppelmann, Bonaduz (CH); and Botho Hoffmann, Domat/Ems (CH)
Assigned to EMS-CHEMIE AG, Domat/Ems (CH)
Filed by EMS-CHEMIE AG, Domat/Ems (CH)
Filed on Jun. 15, 2021, as Appl. No. 17/348,481.
Claims priority of application No. 00744/20 (CH), filed on Jun. 22, 2020.
Prior Publication US 2021/0395517 A1, Dec. 23, 2021
Int. Cl. C08L 71/12 (2006.01); C08K 3/40 (2006.01); C08K 7/14 (2006.01)
CPC C08L 71/123 (2013.01) [C08K 3/40 (2013.01); C08K 7/14 (2013.01); C08L 71/12 (2013.01); C08L 2205/025 (2013.01); C08L 2205/035 (2013.01)] 9 Claims
 
1. A thermoplastic molding composition consisting of:
(A) mixture of at least one polyamide (A1) selected as an aliphatic polyamide from the group consisting of PA610, PA612, PA12, PA616 and mixtures thereof, at least one polyphenylene ether (A2), a compatibilizer (A3) or as a mixture of a compatibilizer and a free radical initiator; whereby the compatibilizer is selected from the group consisting of maleic acid, maleic anhydride, fumaric acid, acrylic acid, methacrylic acid, methylmaleic acid, methylmaleic anhydride, itaconic acid, itaconic anhydride, butenylsuccinic acid, butenylsuccinic anhydride, tetrahydrophthalic acid, tetrahydrophthalic anhydride N-phenylmaleimide, malic acid and 2-hydroxynonadecane-1,2,3-tricarboxylic acid, the mono- or diesters of the acids mentioned with C1- to C12-alcohols such as methanol or ethanol, the mono- or diamides of the acids mentioned, which may be substituted on the nitrogen with alkyl or aryl radicals having up to 12 carbon atoms, the salts with alkali or alkaline earth metals such as calcium and potassium and mixtures thereof; and whereby the radical initiator is selected from the group consisting of 1,1-di-tert-butyl-peroxy-3,3,5-trimethylcyclohexane, tert-butyl-peroxy-isopropyl-carbonate, tert-butyl-peroxy-3,3,5-trimethylhexoate, tert-butyl-peracetate, tert-butyl perbenzoate, 4,4-di-tert-butyl peroxy-valeric acid n-butyl ester, 2,2-di-tert-butyl peroxy-butane, dicumyl peroxide, tert-butyl cumyl peroxide, 1,3-bis(tert-butyl peroxyisopropyl) benzene, di-tert-butyl peroxide and mixtures thereof; and optionally an olefinic and/or vinylaromatic polymer (A4);
(B) 10 to 60% by weight of glass filler, selected as glass fibers having a non-circular cross-section and an axis ratio of major to minor cross-sectional axis in the range of from 3 to 5 the glass composition of which comprises 52.0 to 57.0% by weight of silica, 13.0 to 17.0% by weight of aluminum oxide, 15.0 to 21.5% by weight of boron oxide, 2.0 to 6.0% by weight of magnesium oxide, 2.0 to 6.0% by weight of calcium oxide, 1.0 to 4.0% by weight of titanium dioxide, 0 to 1.5% by weight of fluorine, 0 to 0.6% by weight of alkali oxides;
(C) 1 to 8% by weight of an LDS additive as copper tungstate;
(D) 0 to 5% by weight of additives other than components (A), (B) and (C);
wherein 80 to 100% by weight of mixture (A) consists of a mixture (M) of components (A1), (A2) and (A3) and 0 to 20% by weight of component (A4), each based on the sum of components (M) and (A4), and wherein the sum of components (M) and (A4) gives 100% by weight of mixture (A);
and where the mixture (M) consists of from 36 to 92% by weight of component (A2), from 8 to 60% by weight of component (A1) and from 0 to 4% by weight of component (A3), in each case based on the sum of components (A1) to (A3), and where the sum of components (A1) to (A3) gives 100% by weight of the mixture (M); and the sum of components (A) to (D) being 100% by weight of the molding composition.