Solution for use in the prevention of smear in the manufacture o

Details Solution for use in the prevention of smear in the manufacture o Solution for use in the prevention of smear in the manufacture o

1988-10-24

1990-04-03

Beck, Shrive

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 1412, 106 1413, 106 1415, C04B 902, B22F 700

Patent

active

049137409

ABSTRACT:
A solution and a method of using it for preventing smear in the manufacture of printed circuit boards includes monoethanolamine combined with a fatty acid for neutralizing the active amine except in the presence of relatively high heat, and a surface tension reducing agent. The solution is applied to the printed circuit board as holes are being drilled. The friction of the drill bit on the printed circuit board generates heat which activates the amine allowing it to attack the inner glass epoxy walls of the printed circuit board and prevent smear.

REFERENCES:
patent: 4294729 (1981-10-01), Bakos
patent: 4342607 (1982-08-01), Zado
patent: 4495007 (1985-01-01), Zado
patent: 4557767 (1985-12-01), Hwang
patent: 4749449 (1988-06-01), Scott
patent: 4790912 (1988-12-01), Holtzman

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