| abstract |
1,186,218. Coated sheet material. DYNAMIT NOBEL A.G. 8 June, 1967 [8 June, 1966 (2)], No. 26614/67. Heading B2E. [Also in Divisions B5 and H1] A substrate for use in the manufacture of a printed circuit comprises a laminate of a plurality of resin-impregnated sheets, a surface of which laminate is covered with a layer of an acrylonitrile-butadiene-styrene polymer or of poly-4-methyl pentene. The laminate may be formed from cellulose paper, cotton fabric, glass fibre fabric, or synthetic fibre fabric impregnated with a phenol-formaldehyde resin, an epoxide resin or an unsaturated polyester resin. The polymer layer may be applied to the laminate by dipping, spraying, or casting. The surface of the polymer layer is roughened, e.g. by treatment with chromosulphuric acid, before a metal (e.g. copper) foil pattern is applied thereto, e.g. by electrodeposition. |