Aqueous silver composition

Compositions – Electrically conductive or emissive compositions – Free metal containing

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106 114, 106 119, 427125, 501 19, 501 20, H01H 122, B05D 102, B05D 512, C09D 524

Patent

active

054926530

ABSTRACT:
Coating compositions of silver flake suspended in predominantly aqueous vehicle is disclosed for laying down a coating of electrically conductive metal on resistive or dielectric substrates useful in the electronics industry. The coating compositions provide an ideal combination of high silver loading and low viscosity for spray painting desired thickness coatings at high speed in a single pass. The novel compositions include silver flake, water soluble polymer binder, water and a substantially completely water soluble, organic co-solvent. The coating compositions have good green strength after drying and may be used to apply an electrically conductive base to enable electroplating plastic or elastomer parts. Optional sintering adhesives can be added to allow high temperature, permanent bonding of the silver to a ceramic substrate. The coating compositions have excellent storage stability such that settled solids can be redispersed readily with brief and/or mild agitation.

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Acrysol.RTM. I-2426 Brochure, Rohm and Haas Co., Philadelphia, PA, Sep. 1989.

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