Composition and method for improving the surface insulation resi

Details Composition and method for improving the surface insulation resi Composition and method for improving the surface insulation resi

1992-03-17

1993-05-04

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156656, 156666, 156902, 752 793, 134 3, B44C 122, C23F 100, C09K 1308

Patent

active

052078671

ABSTRACT:
After the stripping or etching away of metal to expose surface areas of insulating resin material in a printed circuit process based upon metal-clad insulating substrate material, the exposed surface areas of insulating material are contacted with a liquid treatment composition, comprised of an aqueous acidic solution containing fluoride ion, effective to remove from the surface areas residual metal species otherwise associated therewith, such that the surface insulation resistance afforded by the insulating surface areas of the printed circuit is improved.

REFERENCES:
patent: 3556883 (1971-01-01), Naito et al.
patent: 4430154 (1984-02-01), Stahl et al.
patent: 4581102 (1986-04-01), Brock
patent: 4978422 (1990-12-01), Letize et al.
patent: 5049234 (1991-09-01), Madhusudhan

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