Rigid polymer laminate with smooth outer surface for stamping - useful as printed circuit board substrate with glass fibre filled core of thermoplastic aryl ether¨ sulphone¨ polymer

摘要

Laminate has a smooth outer surface contg. thermoplastic polymer (I) free from fibrous or particulate filler and another layer of filler (I), produced separately. The filler (II) comprises mineral filler(s) and/or glass fibres; and (I) has high enough thermal and chemical stability to fix electrical components firmly to the laminate. Pref. (I) is an amorphous polymer with recurring aryl ether sulphone untis of formula -Phe-SO2-Phe-O-Ar-O- (IA) in layer (a) and opt. (b) or with aromatic ether imide units of formula (IB) in layer (a): Phe = p-phenylene; Ar = (i) -Phe-SO2-Phe- or (ii) -Phe-SO2-Phe- and -Phe- in ca. 3:2 - 19:1 molar ratio; or -Phe-Phe-; the bonds of the -O-Z-O- gp. are in the 3,3'-, 3,4'-, 4,3'- and 4,4'- position; Z = -Phe-Phe or pref. -Phe-Cme2-Phe-; R = -Phe-, m-phenylene, -Phe-O-Phe-and/or -Phe-SO2-Phe, pref. m-phenylene. Layer (a) contains ca. 1-10 (wt.)% catalyst (III) for electroless metallisation; or the material is a 3-ply laminate with the configuration (a)-(b)-(a) and layer (b) contains ca. 1-10% (III). (III) pref. is Pd on alumina. USE/ADVANTAGE - Used for printing circuits by the semiadditive, subtractive or esp. additive technique. Produced by laminating extruded layers. (15pp Dwg.No.0/0)