SYNOPSISButyl acrylate, styrene, N,N-dimethylaminoethylmethacrylate, and N-( n -butoxymethyl) acrylamide were copolymerized to prepare a cationic acrylic copolymer (I) containing butoxymethylamide groups. This copolymer can be mixed with an epoxy-amine adduct (11) , acetic acid, and deionized (D.I.) water to form a coemulsion containing two cationic resins. The electrophoretic codeposition of the coemulsion and physical and chemical properties of the deposited film were investigated. The resin composition of film deposited from coemulsion was determined by Fourier transform Infrared (FTIR) quantitative analysis to study the coemulsion and electrophoretic codeposition behavior. The applicability of this two-component coemulsion in primer-surfacer ( pricer) electrodeposition paint was also discussed. The results indicate that at any coemulsion resin composition the resin composition of electrodeposited film is almost equal to the coemulsion resin composition. The throwing power of emulsion increases with increasing applied voltage, as expected. However, the throwing power of coemulsion is almost equal to that of the I1 emulsion but greater than that of the I emulsion. Furthermore, all cured films derived from mixtures of 1/11 show excellent adhesive strength, good hardness, and high levels of salt spray resistance.

SYNOPSIS2-Ethylhexanol-half-blocked-toluene diisocyanate ( 2EH-half-blocked TDI) was first reacted with 2-hydroxyethyl methacrylate (HEMA) to prepare HEMA-TDI-2EH monomer containing blocked-isocyanate groups. This monomer was reacted with butyl acrylate, styrene, and N,N-dimethylaminoethyl methacrylate to prepare an acrylic copolymer 111' containing blocked-isocyanate groups and tertiary amine groups. The acrylic copolymer 111' can be mixed with a n epoxy-amine adduct IV', acetic acid, and deionized (D.I.) water to form an electrodepositable coemulsion. The electrophoretic codeposition of the coemulsion and physical and chemical properties of the codeposited film were investigated. The resin composition of film deposited from coemulsion was determined by Fourier transform infrared ( FTIR ) quantitative analysis to study the coemulsion and electrophoretic codeposition behavior. The applicability of this two-component coemulsion in primer-surface (pricer) electrodepositable paint was also discussed. The results indicate that the deposition yield of cationic acrylic copolymer I11 is greater than that of cationic epoxy resin IV, i.e., the deposition velocity of I11 is faster than that of IV. However, resins I11 and IV can be well codispessed in D.I. water to form stable coemulsions; thus, the resin composition of deposited is almost equal to the coemulsion resin composition. Moreover, the throwing power of coemulsion is almost equal to that of IV emulsion but greater than that of I11 emulsion. The optimum resin compositions of coemulsions for obtaining better gel content of deposited films are between 0.65 and 0.8

SYNOPSIS2,4-Toluene diisocyanate (TDI ) was partially blocked with equimolar mixtures of dimethylaminoethanol (DMAE) and 2-ethylhexanol(ZEH) of different ratios to form the DMAE/ 2EH half-blocked TDIs, which were subsequently reacted with 1 /3 mol trimethylolpropane ( TMP ) to yield the trimethylolpropane-toluene diisocyanate-dimethylaminoethanol/ 2-ethylhexanol ( TMP-TDI-DMAE/ 2EH ) resins having various content of tertiary amine groups. These resins were neutralized with acetic acid and then dispersed in deionized water, resulting in the milky emulsions used for cationic electrodeposition. Some electrodeposition properties, such as deposition yield, conductivity, rupture voltage, and throwing power, of the resins were investigated. In addition, one of the obtained resins (added as a crosslinker) and an amine-epoxy adduct were codispersed in deionized water, and the nature of electrodeposition of the two-component emulsion is discussed.

SUMMARY:A diglycidylether of bisphenol A epoxy resin (DGEBA) was first reacted with 2,4-toluene diisocyanate partially blocked with 2-ethylhexanol (2-EH P. B. TDI) to form modified epoxy resin, and subsequently reacted with different molar ratios of diethanolamine and bis(2-methylisobuty1ketiminoethyl)amine (DKI) (used as ringopening agents) to give diethanolamine/diketimine terminated resins. These resins were hydrolyzed and neutralized with acetic acid to give cationic resins containing various contents of primary amine groups in the terminal polymeric chain. These cationic resins can be dissolved in a suitable solvent and mixed with deionized water to obtain emulsions. The electrodeposition properties and characteristics of the resulting cationic resins were investigated in detail. The effects of hydrophobic solvents, such as hexyl cellosolve (HCS) and toluene, on the deposition properties of the emulsions are discussed. ZUSAMMENFASSUNG:Ein Bisphenol-A-Epoxidharz wurde zunachst rnit Toluylendiisocyanat, dessen eine Isocyanatgruppe rnit 2-Ethylhexanol blockiert war, und dann rnit unterschiedlichen

SYNOPSISThe emulsification and electrodeposition properties of mixtures of polyoxypropylene-(POP) modified cationic epoxy resin ( I11 ) and nonionic trimethylolpropane-toluene diisocyanate-2-ethylhexanol (TMP-TDI-2EH, V ) were investigated and the compositions of their electrodeposited films were obtained by Fourier Transform Infrared ( FTIR) quantitative analysis to study the effects of "soft segment" (oxypropylene groups) contained in resin 111 on the coemulsion and electrophoretic behavior. The results indicate that the deposition yield and throwing power of emulsion of resin I11 are highly dependent on its average molecular weight (Mw). Resin 111 with higher Mw has higher deposition yield but lower throwing power. Moreover, the deposition yield of V/III coemulsion also increases with increasing the M w of 111. On the other hand, the throwing power of V/III coemulsion is not related to the M w of 111 but is influenced by the amount of soft segments in 111. Increasing soft segment content in I11 increases the throwing power of the coemulsion. Furthermore, at the conditions providing stable coemulsion, the composition of the electrodeposited film is almost equal to the resin composition of the coemulsion. INTRODUCTIONTwo or multi-component cationic coatings can provide better storage stability for electrodeposition emulsions and better physical and chemical properties of the electrodeposited films than one-component systems?-'6 In the earlier papers, 1-5 most of the crosslinkers of two-component cationic coatings were uncharged resins; however, the codeposition behavior of uncharged crosslinker and cationic resin is not well understood.In our previous the compositions of the films electrodeposited from coemulsions of cationic resin /cationic crosslinker or cationic resin / CCC 0021-8995/93/C61031-09results indicate that in the "cationic resin/cationic crosslinker" coemulsion system, 6-7 the composition of the deposited film is affected by the individual deposition velocities of the main resin and crosslinker; on the other hand, in the "cationic resin! nonionic crosslinker" coemulsion system,8 the composition of the electrodeposited film is almost equal to the resin composition of the coemulsion.The cationic resins in our studies described above (TDI) .Ethylene glycol mono-n-butyl ether (butyl cellosolve, BCS, Wako EP grade) and acetic acid (Wako first grade) were used in the preparation of electrodeposition emulsion. InstrumentsAn electrodeposition apparatus and a Jasco-7000 FTIR spectrophotometer were employed. The detailed scheme of the electrodeposition apparatus was shown in a previous p~blication.'~ A copper electrode (anode) and aluminum plate (cathode) with a surface area of about 30 cm2 were used. Approximately 200 mL of emulsion was placed in the glass vessel of the electrodeposition apparatus. After deposition, the aluminum plate was rinsed with distilled water and dried in an air circulating oven at lOO"C, then reweighed to obtain the deposition yield of deposited film ( mg/cm2). Synthesis POP-Mod...