Patent ID: 6042893
Filing Date: 2000-03-28
Classification: C08G,C09D,Y10T

Abstract:
A process for coating a conductive substrate comprising contacting said substrate with a curable conductive coating composition comprising:(i) a blocked reactive component wherein said blocked reactive component is a blocked isocyanate or a blocked isothiocyanate;(ii) a functional compound reactive with said blocked reactive component, said functional compound containing active hydrogen;(iii) a catalyst for promoting the reaction of said blocked reactive component with said functional compound wherein said catalyst is:(a) based on a first reaction product of manganese, cobalt, nickel, copper, zinc, germanium, antimony, or bismuth, or the oxides thereof with a reactant, wherein said reactant is a mercaptan, or an organic acid, wherein said organic acid is hexanoic, oxalic, adipic, lactic, tartaric, salicylic, thioglycolic, succinic, or mercapto succinic acid, or the reaction product of copper or germanium, or the oxides thereof with a lower aliphatic acid, said first reaction product in combination with a triorganotin compound or,(b) a second reaction product of manganese, germanium, antimony or bismuth of the oxides thereof and said reactant, or the reaction product of germanium or the oxides thereof with a lower aliphatic acid, said second reaction product being in combination with a monorgano or diorgano tin compound,for promoting the reaction of said blocked isocyanate or blocked isocyanate with said functional compound;wherein said triorganotin compound comprises R.sub.3 SnA wherein each R is a hydrocarbyl group bonded directly to tin through carbon and may be the same or different, branched or unbranched, saturated or unsaturated, substituted or unsubstituted comprising C.sub.1 to about C.sub.18 alkyl, C.sub.6 to about C.sub.20 aryl, cycloalkyl, alkaryl, vinyl and allyl, A is a carboxylate, --O--SnR.sub.3, --S--SnR.sub.3, --O--SnR.sub.2 X, --O--SnRX.sub.2, --SR, ##STR5## X, in which R is as defined above, R.sup.3 is a divalent hydrocarbyl group which may be saturated or unsaturated, branched or unbranched, substituted or unsubstituted, aryl C.sub.6 to about C.sub.20, alkyne of about C.sub.4 to about C.sub.20, ""p"" represents a polymer of about 5 to about 1000 repeating units, X is an anion comprising chlorine, bromine, iodine, fluorine, hydroxyl, carboxyl, alkoxy, hydride, sulfonate, toluene sulfonate, C.sub.1 to about C.sub.5 alkyl sulfonate, phosphate, silicate, carbonate and isocyanate, andpassing an electric current between the substrate and a counter-electrode in electrical contact with said coating until a coating thickness is deposited on said substrate and curing said coating.