Patent ES-8602973-A1 (ES)
Title: Coating process by electrodeposition and coating compositions useful in the process.
IPC: C09D5/44
Filed: 1983-11-18
Abstract: A process for coating a conductive substrate wherein the substrate is immersed in a coating composition comprising an aqueous medium and a dispersed coating material, the substrate is made a cathode in an electric circuit, and an electric current is passed between the cathode and a counter-electrode until a desired amount of coating material is deposited on the substrate, characterised in that:- (a) the coating material comprises a film-forming polymer which is sterically stabilised as a dispersion of particles in the aqueous medium and is free from stabilising ionic charges, (b) the film-forming polymer comprises, or is associated with, a polymeric non-ionic hydrophilic moiety which is solvated by the aqueous medium and which contributes to the steric stabilisation of the film-forming polymer particles in the aqueous medium and (c) the dispersion of film-forming polymer particles in the aqueous medium has a 'critical coalescence value (ccv)' which is more negative than -0.3 units where cvv is calculated as follows: ccv=20 d(cct)/Ad (pH) where A is the critical coalescence temperature in K at pH 12 and d/(cct) d pH is the slope of the cct/pH plot at pH 12. (13pp) EPAB- EP-109760 B A process for coating a conductive substrate wherein the substrate is immersed in a coating composition comprising an aqueous medium and a dispersed coating material, the substrate is made a cathode in an electric circuit, and an electric current is passed between the cathode and a counter-electrode until a desired amount of coating material is deposited on the substrate, characterised in that:- (a) the coating material comprises a film-forming polymer which is sterically stabilised as a dispersion of particles in the aqueous medium and is free from stabilising ionic charges, (b) the film-forming polymer comprises, or is associated with, a polymeric non-ionic hydrophilic moiety which is solvated by the aqueous medium and which contributes to the steric stabilisation of the film-forming polymer particles in the aqueous medium and (c) the dispersion of film-forming polymer particles in the aqueous medium has a 'critical coalescence value (ccv)' which is more negative than -0.3 units where cvv is calculated as follows: ccv=20 d(cct)/Ad (pH) where A is the critical coalescence temperature in K at pH 12 and d/(cct) d pH is the slope of the cct/pH plot at pH 12. GBAB- GB2130218 B A process for coating a conductive substrate wherein the substrate is immersed in a coating composition comprising an aqueous medium and a dispersed coating material, the substrate is made a cathode in an electric circuit, and an electric current is passed between the cathode and a counter-electrode until a desired amount of coating material is deposited on the substrate, characterised in that: (a) the coating material comprises a film-forming polymer which is sterically stabilised as a dispersion of particles in the aqueous medium and is free from stabilising ionic charges (b) the film-forming polymer comprises, or is associated with, a polymeric non-ionic hydrophilic moiety which is solvated by the aqueous medium and which contributes to the steric stabilisation of the film-forming polymer particles in the aqueous medium and (c) the dispersion of film-forming polymer particles in the aqueous medium has a 'critical coalescence value (ccv)' as herein defined which is more negative than -0.3 units. USAB- US4460439 A Conductive substrate is coated by making it cathodic in a coating bath contains sterically stabilised film forming polymer dispersed in an aqs. medium free of stabilising ionic charges. The polymer comprises or is assounded with a polymeric non-ionic hydrophilic moiety which is solvated by the aqs. medium and contributes to the stabilisation. - The polymer dispersion has a critical coalescence value which is more negative than -0.3 volts.