Process for metallizing substrates using starved-reaction metal-

Details Process for metallizing substrates using starved-reaction metal- Process for metallizing substrates using starved-reaction metal-

1991-08-01

1992-11-10

Powell, William A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156643, 156655, 156668, 156902, 427 98, 428901, B32B 300, B05D 512, B44C 122, B29C 3700

Patent

active

051621444

ABSTRACT:
A unique process metallizes a substrate surface using a reducing agent including a borohydride to reduce, in a starved reaction, metal oxide particles (300) substantially uniformly distributed and at a controlled concentration in a particle-filled resin (204) to produce catalytic island areas (301). The catalytic island areas (301) formed have a surface resistivity greater than 10.sup.6 ohms per square. These catalytic island areas (301) are then electrolessly metallized to a predetermined thickness, such that adjacent catalytic island areas (301) are interconnected and form metallic features, such as pads, vias (213), and conductors (210, 211 and 212). The starved reaction limits the reduction of metal oxide particles (300) to catalytic island areas (301) and prevents migration of reduced metal beyond each of the exposed surfaces of particle-filled resin (204) which are to be metallized.

REFERENCES:
patent: 4564424 (1986-01-01), Cassat et al.
patent: 4565606 (1986-01-01), Cassat
patent: 4590115 (1986-05-01), Cassat

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