| 摘要 |
1379961 Etching WESTERN ELECTRIC CO Inc 13 June 1972 [14 June 1971 19 May 1972] 27557/72 Heading B6J A polyimide surface is etched with an aqueous solution of ethylene diamine and a basic compound selected from the group consisting of (a) a carbonate, hydroxide, cyanide, borate, phosphate, pyrophosphate, sulphite, sulphide or silicate of an alkali metal such as sodium, potassium, lithium, rubidium or caesium; (b) a carbonate, hydroxide, cyanide, borate or sulphide of ammonia; (c) alkali metal alkoxides where the alkylate portion has 1-4 carbons; (d) a quaternary ammonium hydroxide of the formula (R1, R2, R3, R4)-N-OH, where R1 and R2 are each an alkyl group of 1-4 carbons, R3 is an alkyl or alkenyl group of 1-18 carbons, and R4 is an alkyl or alkenyl group of 1-18 carbons, a phenyl, an alkyl-phenyl group where the alkyl portion has 1-18 carbons, a benzyl, or an alkyl-benzyl group where the alkyl portion has 1-18 carbons. A preferred basic compound is sodium hydroxide. The polyimide etched is made from the anhydride of pyromellitic acid and 4,4<SP>1</SP>-diaminodiphenyl ether. After etching to roughen its surface, the polyimide is subjected to electroless plating. |
