Digital Equipment Corporation

Forsythe Cosmetic Group, Ltd.

Kenneth K Sugathan

Carl Horowitz

Felicia Dragnea

Henry B Gordon

Kenneth W Mamayek

Paulose P Thottathil

Richard L Wiedeman

John M Ryan

A method of grafting a conductive, tenacious, and protective coating on a metallic substrate. The metallic substrate, such as steel, aluminum, iron, platinum, silver, nickel, gold, cobalt, copper, copper alloys, or combinations thereof, is contacted with a composition having: (i) one or more polymerizable monomers having at least two functionalities; (ii) one or more graft initiators containing nickel ion in an amount effective to initiate the graft polymerization of the monomers; and (iii) a reducing agent capable of reducing nickel ion to nickel metal. The composition and substrate are heated for a time and at a temperature effective to graft polymerize the monomers and nickel metal onto the substrate and form a conductive, tenacious, and protective coating bonded to the substrate. The coating can also contain elemental phosphorous. Preferably, the coated substrate has a surface resistivity of less than 0.1 ohm per square. The method, coated substrate, and composition are useful for improving the electro-magnetic compatibility (EMC) and electro-static discharge (ESD) protection of electrical enclosures.

Deposition of a conductive and protective coating on a metallic substrate

Dispersions of titanium dioxide pigments with improved long-term resistance to pigment settling and precipitation are disclosed. The pigment dispersions are formed by chemically grafting vinyl and/or acrylic polymers to nitrocellulose in dispersions of nitrocellulose and titanium dioxide pigments. Nitrocellulose forms a loose association with titanium dioxide in dispersion. The chemical grafting improves the precipitation and settling resistance of nitrocellulose, and thus the precipitation and settling resistance of the associated titanium dioxide.

Titanium dioxide dispersions and processes for their production

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Piscataway, NJ, United States of America

Kenneth K Sugathan