Abstract: The present invention is directed towards an electrodepositable coating composition comprising a film-forming binder and electrically conductive particles, wherein the electrically conductive particles are present in an amount of at least 25% by weight, based on the total solids weight of the electrodepositable coating composition. The present invention is also directed towards methods of coating a substrate, coatings, and coated substrates.

Abstract: The present invention discloses the fabrication and application of a shape memory polymer possessing transesterification-induced permanent reshaping. The ester-containing crosslinked polymer is obtained by crosslinking ester bearing polymer precursors or by reaction of monomers which yield ester bonds. The transition temperature falls between 20-150° C. The reshaping temperature is tuned by catalyst amount and should be 20° C. above the transition temperature. The breakthrough of the present invention lies in integrating shape memory effect and plastic deformation into the same polymer and triggering the respective function at different occasions. The permanent shape of as synthesized polymer could be modified arbitrarily and cumulatively. Therefore, the hierarchical structure which could not otherwise be obtained due to the limit of mold fabrication process should expand the practical application of SMPs.

Abstract: A curable coating composition having satisfactory low temperature curing property and fast drying speed while maintaining the flexibility and impact resistance of coating films, and also providing the coating films with good anti-corrosion property and good adhesion to a steel substrate; and a process of preparing the curable coating composition.

Abstract: The invention relates to cationic water-dilutable binders comprising a water-soluble bismuth salt or chelate complex B, and a chain-extended epoxy-amine adduct EA which comprises moieties derived from epoxide compounds E2 having at least two epoxide groups per molecule, low molar mass epoxide compounds E3 having two epoxide groups per molecule, amidoamines A41 having at least one amide group and at least one amino group, made from amines A1 having at least two amino groups per molecule and a fatty acid A4, and one or more further amines A1, an amine A2 which has at least one secondary amino group per molecule, an amine A3 having at least one tertiary, and at least one primary amino group per molecule, fatty acids A4, and phenolic compounds A5 having at least two phenolic hydroxyl groups, to a process for their preparation, and to the use thereof as corrosion protection coatings.

Abstract: Provided are: a graft copolymer which can be safely and stably produced with simple operation, while maintaining the characteristics of an amine, and which is lower in the introduction cost than conventional graft copolymers; and a method for producing the graft copolymer. A polyamine graft polymer that is obtained by polymerizing a polyamine derivative, which is obtained by reacting a polymer compound (a) having at least one amino group with a compound (b) having at least one epoxy group, with an ethylenically unsaturated monomer (c). A method for producing a polyamine graft polymer, which comprises a step for adding, for polymerization, an ethylenically unsaturated monomer (c) and a radical polymerization initiator to a polyamine derivative, which is obtained by reacting a polymer compound (a) having at least one amino group with a compound (b) having at least one epoxy group, in a polar solvent.

Abstract: The invention relates to a curing agent for epoxy resins which is an aqueous dispersion of a multifunctional amine AC having more than one primary amino group per molecule, and at least one moiety per molecule derived from the reaction of a compound C containing at least one reactive group which is preferably an epoxide group, with a molecule having at least one blocked primary amino group and at least one group which is reactive towards the at least one reactive group of compound C, which is selected from the group consisting of secondary amino groups >NH, of hydroxyl groups —OH, of mercaptan groups —SH, of amide groups —CO—NHR, where R can be hydrogen or an alkyl group having from one to twelve carbon atoms, of hydroxyester groups, and of acid groups, particularly of carboxyl groups —COOH, sulphonic acid groups —SO3H, and phosphonic acid groups —PO3H2, and preferably, also moieties which are compatible with an epoxy resin, as well as a process for its preparation, and a method of use thereof.

Abstract: A one component precursor for the polymeric foam (OCF) composition comprising a very low amount of free monomeric MDI. The present OCF composition may be obtained without any free MDI removal step, and without the addition of extra solvent to compensate for the substantially lower amount of free MDI, compared with traditional compositions. The present composition comprises a source of free NCO of functionality of at least 2.6, a tri- or higher functional alcohol, all polyols being characterized by a rather low molecular weight and at least a specific mono-functional alcohol as well as an isocyanate end-capped prepolymer of toluene diisocyanate (=end capped TDI). The OCF composition is suitable for being dispensed from a pressurized can with a blowing agent.

Abstract: A method includes (a) contacting at least a portion of a substrate material with a solution comprising a source of copper, wherein the solution is essentially free of a source of a group IIIB metal and a source of a group IVB metal; and (b) after step (a), contacting at least a portion of the substrate with an electrodepositable coating composition comprising (i) a film-forming resin and (ii) a source of yttrium.

Abstract: Disclosed herein are functionalized polymers comprising ethylene and substituted ethylene segments, which have been modified by epoxidation to enhance their crosslinking ability. These functionalized polymers are useful as film forming resins in cathodic electrocoating compositions. Also disclosed herein are aqueous dispersion compositions comprising the functionalized polymers and a process for coating various electrically conductive substrates.

Abstract: This invention teaches a method of coating a vehicle wheel to increase wear resistance which, in its preferred embodiment, includes the steps of providing a vehicle wheel and applying a wear resistant coating between/intermediate a primer and a topcoat. The wear resistant coating is applied to at least the tire bead flange of the vehicle wheel but may be applied to any area of the wheel. It is advantageously comprised of a MIL-P-53022B Type II lead and chromate free, corrosion inhibiting epoxy primer with an addition of 3% polytetrafluoroethylene (PTFE), and is formulated in such a manner so as to allow “wet on wet” application over a cured MIL-P-53084 primer. This application method improves adhesion through surface to surface covalent reaction between the polymerization of polyurethane top coat and the polymerization of intermediate epoxy polyamide wear resistant coating.

Abstract: A pigment dispersing resin is disclosed along with pigment dispersion, electrodepositable coating compositions using the pigment dispersing resin, and methods for applying the electrodepositable coating composition. The pigment dispersing resin consists essentially of the carboxylic acid salt of an aminated bisphenol epoxy resin and an alkoxylated styrenated phenol. Pigment dispersions made from the dispersing resin are especially useful for forming low or no volatile organic content electrocoating baths.

Abstract: A process for forming a multilayer composite coating on a substrate is provided. The process includes forming an electrodeposition coating layer on the substrate by electrodeposition of a curable electrodepositable coating composition over at least a portion of the substrate. Optionally, the coated substrate is heated to a temperature and for a time sufficient to cure the electrodeposition coating layer. A basecoating layer is formed on the electrodeposition coating layer by depositing an aqueous curable basecoating composition directly onto at least a portion of the electrodeposition coating layer. Optionally, the basecoating layer is dehydrated. A top coating layer is formed on the basecoating layer by depositing a curable top coating composition which is substantially pigment-free directly onto at least a portion of the basecoating layer. The top coating layer, the basecoating layer, and, optionally, the electrodeposition coating layer are cured simultaneously.

Abstract: A process for forming a multilayer composite coating on a substrate is provided. The process includes forming an electrodeposition coating layer on the substrate by electrodeposition of a curable electrodepositable coating composition over at least a portion of the substrate. Optionally, the coated substrate is heated to a temperature and for a time sufficient to cure the electrodeposition coating layer. A basecoating layer is formed on the electrodeposition coating layer by depositing an aqueous curable basecoating composition directly onto at least a portion of the electrodeposition coating layer. Optionally, the basecoating layer is dehydrated. A top coating layer is formed on the basecoating layer by depositing a curable top coating composition which is substantially pigment-free directly onto at least a portion of the basecoating layer. The top coating layer, the basecoating layer, and, optionally, the electrodeposition coating layer are cured simultaneously.

Abstract: Provided is an electrodepositable coating composition of a resinous phase dispersed in an aqueous medium, the resinous phase including (a) an active hydrogen-containing, cationic salt group-containing resin; and (b) an at least partially blocked polyisocyanate curing agent. The composition contains an organotin catalyst which is or is derived from a dialkyltin compound having the structure (I): [R1][R2]—Sn?O??(I) where R1 and R2 are the same or different, and each independently represents a monovalent hydrocarbon group wherein the sum of the carbon atoms in R1 and R2 is greater than 8. The catalyst is present in an amount sufficient to effect cure at a temperature at or below 340° F. (171.1° C.). Methods of preparing and using the composition also are provided.

Abstract: A liquid chromatography/mass spectrometry apparatus combines a chromatograph having a liquid delivery part for delivering mixed multiple solvents, and a mass spectrometer having an ionization part for spraying and ionizing. The apparatus has a storing part for storing a relationship between a mixture ratio of the multiple solvents in the liquid delivery part and an optimal or nearly optimal voltage applied to the ionization part, a ratio information acquiring part for computing the mixture ratio over time, a voltage value computing part for computing the optimal or nearly optimal applied voltage at any point, and a voltage controlling part for changing the voltage applied to the ionization part over time. By virtue of the ability to adjust the applied voltage during analysis, the ionization efficiency is always high, and the analysis can be performed with high sensitivity for all of the multiple components in the liquid sample.

Abstract: With the use of a lead-free cationic electrodeposition coating composition containing a sulfonium-modified epoxy resin, an amine-modified novolak-type epoxy resin, and a blocked isocyanate curing agent as a binder resin, wherein the content of volatile organic components is 1% by weight or less, the coating liquid conductivity is 1000 to 2500 ?S/cm, and the minimum film-forming temperature of the coated layer electrodeposited on an object to be coated is 20 to 35° C., electrodeposition coating is carried out at or above the temperature which is lower by 2° C. than the minimum film-forming temperature and at or below the temperature which is higher by 6° C. than the minimum film-forming temperature.

Abstract: The present invention is directed to a curable electrodepositable coating composition having a resinous phase dispersed in an aqueous medium. The resinous phase includes (a) one or more ungelled, active hydrogen-containing cationic salt group-containing resins which are electrodepositable on a cathode; (b) one or more at least partially blocked polyisocyanate curing agents; (c) at least one substantially non-volatile antioxidant; and (d) at least one volatile antioxidant. The present invention also provides a process for electrodeposition using the coating and substrates coated therewith.

Abstract: The present invention relates to a device and to a method for coating bicycle components. According to the invention, the device has at least one power supply unit, at least one liquid tank and at least one conveying means for the bicycle components to be coated. On the power supply unit, there are at least two electrodes that are connected to the bicycle components and arranged in the liquid tank. In the liquid tank, there is also a carrier solution having a prescribed proportion of a coating substance, where the electric circuit to the power supply unit is closed when at least one component is at least partially brought into contact with the liquid. The coating substance is deposited at least as a function of a prescribed electric current.

Abstract: A cured multilayer coating provides improved edge corrosion resistance to a substrate. The method of making the cured multilayer coating includes applying by electrophoretic deposition a first curable coating composition to the substrate to establish a coated substrate. The coated substrate is then subjected to an amount of energy sufficient to cause the coated substrate to become a conductive coated substrate. Next, a second curable coating composition is applied to the conductive coated substrate to establish a multicoated substrate. The multicoated substrate is then subjected to an amount of energy sufficient for cross-linking the first and second curable coating compositions to make the cured multilayer coating. The cured multilayer coating has less than 40 rust spots as measured by an Edge Corrosion Test, while a surface roughness, Ra, of the cured multilayer coating is maintained at or below 13 &mgr;in (4.29 nm).

Abstract: Waterborne cathodic electrodeposition (CED) coating compositions comprising resin solids and optionally pigments, fillers and conventional coating additives, wherein said CED coating compositions comprise at least one bismuth compound in a quantity of 0.1 to 2.5 wt. %, calculated as bismuth and relative to resin solids content, together with at least one dicarboxylic acid selected from among acyclic dicarboxylic acids with 3 to 7 carbon atoms and dicarboxylic acids with 8 to 10 carbon atoms comprising a cyclic structural unit in a quantity of 3 to 15 equivalent-%, relative to the acid equivalents present in the CED coating composition.

Abstract: The invention provides a cationic electrodeposition method requiring the immersion of a conductive substrate in a coating composition, applying a voltage between an anode and the conductive substrate, and removing the substrate from the coating composition. The coating composition of the invention comprises, in an aqueous medium, an aqueous dispersion of a resin composition comprising: (A) a polymer having at least one primary carbamate group and one or more quaternary ammonium groups, (B) a carbamate functional reactive additive which is generated insitu during the production of polymer (A) and (C) a compound having a plurality of active methylol or methylalkoxy groups that are reactive with said carbamate groups.

Abstract: Waterborne sanitary can coating composition, derived from at least (a) epoxy resin, derived from phenol derivatives and epichlorohydrin, which has been converted into a cationic NH2 containing form by reaction with amine, an amine adduct or ammonia and subsequently has been converted into corresponding ammonium salt by addition of organic acid, (b) a phenol-formaldehyde resin as curing agent, (c) polyketone resin, having a number average molecular weight Mn of at least 500, and (d) water, containing minor amounts of organic solvents. Coated tin plate coils on which said waterborne sanitary compositions have been applied and coated cans, obtained from the coated tin plate coil.

Abstract: The present invention provides a method for forming a multilayer coating film, comprising: applying a colored cationic electrodeposition coating composition (A) to a metal substrate by electrodeposition; applying a bright pigment-containing clear coating composition (B) to the electrodeposition coating, which is either uncured or thermally cured; and then curing the uncured electrodeposition coating and the clear coating, or the clear coating.

Abstract: Disclosed is a 3 coat 1 bake coating process for forming an intermediate coated film, a base coated film and a clear coated film on an electrodeopsition coated film, wherein the electrodeposition coating composition is a lead-free cationic electrodeposition coating composition which has a volatile organic content of 1% by weight or less, a metal ion content of 500 ppm or less, a neutralizing acid amount of 10 to 30 mg equivalent based on 100 g of binder resin solid content, and the intermediate coating composition and/or the base coated composition comprises a specific amount of a nonaqueous dispersion resin as a resin component. In the coating process, a baking step is omitted from the conventional intermediate coating process, or from the conventional base coating process, nevertheless comparable appearance with that produced by the conventional 3 coat 3 bake coating process is produced.

Abstract: A composition for electrophoretic deposition of a protective coating. The composition comprises a cationic resin emulsion; and a curative mixed with the cationic resin emulsion. The composition after electrophoretic deposition and curing provides the protective coating that has a concentration of extractable ionic contaminants less than about 200 nanograms/cm2; and a concentration of labile components less than about 36,000 nanograms/cm2.

Abstract: The invention provides a cathodic electrocoat coating composition having (A) a polymer comprising at least one primary carbamate group and at least one cationic salting site, (B) a curing agent having groups that are reactive with said functional groups on (A), and (C) a reactive additive comprising at least one compound having a molecular weight of from 131 to 2000 and comprising at least one primary carbamate group and at least one alkyl group selected from the group consisting of branched alkyl groups of from 5 to 30 carbons, straight chain alkyl groups of more than 10 carbons, and mixtures thereof, wherein one or both of (A) and (B) comprise groups that are reactive with the primary carbamate group of (C).

Abstract: The present invention is directed to electrodepositable coating compositions comprising an at least partially gelled resin or reaction product formed from reacting (i) an epoxy-functional polyester with (ii) an amine. The present invention also includes a method for electrocoating a conductive substrate with the described electrodepositable coating compositions. Additionally, the present invention is directed to a conductive substrate coated according to the described method.

Abstract: The present invention provides a method for forming a multi-layer paint film, comprising:

Abstract: A multi-layer coating film-forming method which comprises coating a cationic electrodeposition coating composition (A) containing a blocked polyisocyanate compound as a crosslinking agent to form a non-cured electrodeposition coating film, coating a water based intercoat coating composition (B1) containing a hydroxyl group and carboxyl group-containing base resin, a blocked polyisocyanate crosslinking agent, a fine aluminum powder and a titanium oxide white pigment onto the non-cured electrodeposition coating film to form a non-cured intercoat coating film, followed by heat curing both coating films simultaneously.

Abstract: A two-component concentrate which includes an aqueous dispersion of a cathodically depositable binder having groups comprising active hydrogen that are cross-linkable using blocked polyisocyanate, as the binder component, and an anhydrous, organic solution of an oxime-blocked isocyanate-functional adduct of aromatic polyisocyanate and at least one compound comprising at least one group capable of addition towards isocyanate and at least one tertiary amino group, as the cross-linking component is used for the preparation of cathodic electrodeposition coating compositions.

Abstract: Novel alkaline polymeric binders, preferably amino epoxy binders, for use in cathodic electrodeposition coatings have a number average molecular mass of 1000 to 3000, an amine value of 150 to 250 mg KOH/g binder and 50 to 230 milliequivalents/100 g binder of beta-hydroxyalkyl urethane groups of the formula HOCnH2nOC(O)NH— where n=2 to 3, as well as processes for making such binders; aqueous compositions, particularly cathodic electrodeposition compositions containing such binders (which provide improved throwing power); and process of using such compositions, particularly on automotive bodies and parts thereof, are disclosed.

Abstract: Disclosed are a cationic electrodeposition coating composition and a process for preparing the same in which the dried coating film of the electrodeposition paint has an epoxy-acrylic double-layered structure for displaying excellent properties, and in which an organic solvent content can be minimized. The cationic electrodeposition coating composition having a resinoid dispersed into an aqueous medium comprises a cationic electrodeposition resin and an organic solvent of less than 2.0 percent by weight based on a dispersed solution of the cationic electrodeposition resin.

Abstract: The present invention has for its object to provide a basic cationic electrodeposition coating composition with does not detract from either storage stability or bath stability even though it is basic and which does not make the coating equipment such as the electrodeposition tank and associated piping corroded, and a method for producing it. The present invention is directed to a basic cationic electrodeposition coating composition having a hydrogen ion concentration within the range of 7.5 to 12.0 in terms of hydrogen ion exponent (pH), and a method for producing it.

Abstract: The invention relates to thermosetting resinous binder compositions comprising a cationic resin (1) and a cross-linking agent (2), wherein the cationic resin (1) is an epoxy resin/amine adduct with on average more than one primary amine group, and the cross-linking agent (2) is a polyketone with on average more than one 1,4-dioxobutylene groups in the backbone. The invention also relates to the preparation of these compositions, and their use in general and in CED more particularly.

Abstract: The invention provides a cathodic electrocoat coating composition having (A) a polymer comprising at least one primary carbamate group and at least one cationic salting site, (B) a curing agent having groups that are reactive with said functional groups on (A), and (C) a reactive additive comprising at least one compound having a molecular weight of from 131 to 2000 and comprising at least one primary carbamate group and at least one alkyl group selected from the group consisting of branched alkyl groups of from 5 to 30 carbons, straight chain alkyl groups of more than 10 carbons, and mixtures thereof, wherein one or both of (A) and (B) comprise groups that are reactive with the primary carbamate group of (C).

Abstract: The present invention provides novel microfluidic devices and methods that are useful for performing high-throughput screening assays. In particular, the devices and methods of the invention are useful in screening large numbers of different compounds for their effects on a variety of chemical, and preferably, biochemical systems.

Abstract: The invention provides a process for preparing an allophanate-containing compound in the presence of a metal catalyst and a tertiary amine. In a preferred process, the tertiary amine compound also has a hydroxyl group. The hydroxyl group can react with the isocyanate functionality. Also disclosed is a process in which an allophanate-containing compound is prepared with copper acetate monohydrate as a catalyst. The allophanate-containing compound is used as a curing agent in coating compositions, particularly electrocoat coating compositions. The coating compositions are used to coat articles.

Abstract: An electrocoat coating composition comprising an electrodepositable resin that has functionality reactive with isocyanate and a curing agent having at least one allophanate groups is described. The invention also provides a method of applying the composition of the invention to a substrate and curing the applied coating.

Abstract: A motor component covered with a novel electrocoating that fails to detrimentally affects magnetic memory medium provided in a hard disc or other is provided. With enhanced edge covering ratio, an improved insulation coating is easily formed on the motor component. An insulation coating is electrodeposited on an Nd—Fe—B system plastic magnet, a stacked core of silicon steel, a die-cast motor base of aluminum or other motor component through cationic electrodeposition. The electrodeposition paint for use includes 12 ppm or less of tin content in the aqueous solution, 0.5% or less by weight of carbon black content in the aqueous solution, and, instead, has titanium dioxide and/or silicon dioxide added to pigment. The electrodeposited insulation coating, which has a specified thickness, is heated to temperatures ranging between 40° C. and 90° C. After such preliminary curing, temperatures are again heated to between 150° C. and 190° C.

Abstract: A cathodic electrodeposition paint composition for one or two coats finish comprises (a) an amine-modified polyphenol epoxy resin, (b) an acrylic copolymer having ionizable groups, and (c) resin particles having a particle size of less than 1.0 .mu.m comprised of a core of gelled hydrophobic resin and a shell layer of amino group-containing hydrophilic resin. Components (a), (b) and (c) as well as blocked polyisocyanate crosslinker are dispersed in an aqueous medium containing a neutralizing agent. The paint composition is effective for diminishing the occurrence of stripe-like recessed patterns in the finished steel substrate.

Abstract: A motor component covered with a novel electrocoating that fails to detrimentally affects magnetic memory medium provided in a hard disc or other is provided. With enhanced edge covering ratio, an improved insulation coating is easily formed on the motor component. An insulation coating is electrodeposited on an Nd--Fe--B system plastic magnet, a stacked core of silicon steel, a die-cast motor base of aluminum or other motor component through cationic electrodeposition. The electrodeposition paint for use includes 12 ppm or less of tin content in the aqueous solution, 0.5% or less by weight of carbon black content in the aqueous solution, and, instead, has titanium dioxide and/or silicon dioxide added to pigment. The electrodeposited insulation coating, which has a specified thickness, is heated to temperatures ranging between 40.degree. C. and 90.degree. C. After such preliminary curing, temperatures are again heated to between 150.degree. C. and 190.degree. C.

Abstract: In accordance with the present invention, an electrodepositable composition and a method of electrodeposition using the composition are provided. The electrodepositable composition comprises (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode; (b) a capped polyisocyanate curing agent; and optionally, (c) a metal-containing catalyst. The capped polyisocyanate curing agent comprises a polyisocyanate at least partially capped with a material having the structure: ##STR1## wherein n is a number of 1 to 10; m is a number of 1 to 10 and R is hydrogen or an alkyl or aryl group or substituted alkyl or aryl group having from about 1 to about 30 carbon atoms.

Abstract: The invention relates to cathodically depositable, aqueous electrodeposition coating materials which are characterized in that they contain particles of wax having a diameter of from 1 to 20 .mu.m.

Abstract: An electrodepositable composition is provided comprising (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode; (b) a capped polyisocyanate curing agent; and (c) bismuth diorganodithiocarbamate. Such compositions may be prepared without the use of conventional lead or tin catalysts and exhibit excellent properties as cured coatings.Also provided is a method of electrocoating an electroconductive substrate using the composition of the present invention.

Abstract: A cationic resin having latent primary amine functionality is described. The latent amine functionality is obtained by reacting a cyclic anhydride with an amine compound having two primary amine groups and one secondary amine group. The cationic resin is combined with a curing agent having a plurality of cyclic carbonate groups in an electrocoat bath.

Abstract: A process for forming a cured paint film from a paint containing, as a binder, a resin containing a carbonyl group, or a resin, or a resin mixture containing a carbonyl group and a carboxyl group or a paint containing, as a binder, a resin containing a resin or a resin mixture containing a group which forms a carboxyl group in the subsequent contact step with a hydrazine compound or polyhydrazide compound. The uncured paint film, which contains a carbonyl group, or a carbonyl group and a carboxyl group or a group that forms a carboxyl group, is subjected to a step of curing the paint film by allowing the uncured paint film to contact with a hydrazine compound or a polyhydrazide compound.

Abstract: An electrodepositable coating composition is provided comprising (a) an active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode; (b) a curing agent for transurethanation, transamidation or transesterification curing like at least a partially capped polyisocyanate curing agent; and (c) a catalytic mixture of bismuth and an amino acid or amino acid precursor. Optionally, an auxiliary acid may be present to increase the effectiveness of the amino acid in the mixture with bismuth.

Abstract: An electrodeposition process using an aqueous coating composition comprising a carbamate-functional crosslinking agent and at least one principal resin is described. The carbamate-functional crosslinker is formed by first reacting a polyamine having at least two primary amine groups and at least one secondary amine group with a cyclic carbonate, and then reacting the product of the first reaction with a polyepoxide compound.

Abstract: An electrodepositable composition is provided comprising: (a) active hydrogen-containing, cationic salt group-containing resin electrodepositable on a cathode; (b) at least one at least partially capped polyisocyanate curing agent; (c) at least one metal-containing catalyst; and (d) at least one material having the following general formula: ##STR1## wherein R.sub.1 is alkyl or substituted alkyl having 1 to 18 carbon atoms or aryl or substituted aryl; and R.sub.2 is hydrogen, alkyl or substituted alkyl having 1 to 18 carbon atoms or aryl or substituted aryl. The composition can demonstrate enhanced corrosion resistance at low metal catalyst levels without loss of cured film properties or appearance when electrodeposited and cured over conductive substrates.

Abstract: An electrodepositable composition is provided comprising:(A) a non-gelled cationic resin which is derived from a polyepoxide and which contains in the resin molecule cationic salt groups and active hydrogen groups selected from aliphatic hydroxyl and primary and secondary amino; and present as a separate component(B) a fully capped polyisocyanate curing agent containing substantially no free isocyanate groups. The electrodepositable composition contains from about 0.02 to 1.0 milliequivalents phenolic hydroxyl groups per gram of resin solids, and from about 0.1 to 2.0 milliequivalents beta-hydroxy ester groups per gram of resin solids. The composition provides excellent corrosion resistance when electrodeposited over steel substrates, and does not require lead in the formulation nor the use of a conventional chrome rinse for the steel substrate pretreatment before electrodeposition.