Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1987-09-02
1990-01-09
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428656, 428901, 428704, 427 98, 252513, B32B 900
Patent
active
048927767
ABSTRACT:
An improved circuit board material having a support layer, an electrical resistance layer and a conductive layer. The circuit board material has a resistance of at least about 500 ohms/square. The circuit board material is formed by electro-plating the electrical resistance layer on the conductive layer. The conductive layer is desirably activated prior to electro-deposition of the electrical resistance layer thereon. The conductive layer is activated by contacting with an activating agent such as benzotriazole electrolytic chromate and the like. A preferred electro-plating bath for electro-deposition of the electrical resistance layer comprises about 0.5 mole per liters nickel hypophosphite. The disclosed electro-plating bath functions at ambient temperatures and is effectively temperature independent. Circuit boards can be formed from the circuit board material through a process involving only two etching steps.
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PCT Application No. WO 86/07100 published 12/4/86.
Chemical Abstracts, vol. 84, No. 18, No. 84: 128056Z.
Chemical Abstracts, vol. 90, No. 4, No. 90: 78332N.
Ohmega Electronics, Inc.
Robinson Ellis P.
Ryan P. J.
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