Patent ID: 6096806
Filing Date: 2000-08-01
Classification: C08G,C08J,C08L,C09D

Abstract:
An autodepositing liquid composition comprising water and:(A) at least about 1.0%, based on the composition, of dispersed or both dispersed and dissolved film forming polymer molecules, said amount including at least about 0.2%, based on the composition, of dispersed molecules each containing at least two 1,2-epoxy moieties, the total amount of all of said dispersed or dissolved and dispersed film forming polymer molecules having the following size distribution characteristics in a dispersion, or dispersion and solution, (the phrase ""dispersion, or dispersion and solution"" being hereinafter abbreviated as ""DDS""):(1) the DDS has a mean light scattering particle size that is at least about 100 but not more than about 300 nm;(2) no more than about 1.0% of the light scattering particles volume in the DDS consists of particles with a diameter larger than about 450 nm;(3) no more than about 25% of the light scattering particles volume in the DDS consists of particles with a diameter larger than about 250 nm;(4) no more than about 50% of the light scattering particles volume in the DDS consists of particles with a diameter larger than about 200 nm; and(5) no more than about 75% of the light scattering particles volume in the DDS consists of particles with a diameter larger than about 175 nm;(B) an emulsifying agent component in sufficient quantity to emulsify any insoluble part of component (A) so that, in the autodepositing liquid composition, no separation or segregation of bulk phases that is perceptible with normal unaided human vision occurs during storage at 25.degree. C. for at least 24 hours after preparation of the autodepositing liquid composition, in the absence of contact of the autodepositing liquid composition with any substance that reacts with the autodepositing liquid composition; and(C) a dissolved accelerator component, selected from the group consisting of acids, oxidizing agents, and complexing agents, sufficient in strength and amount to impart to the autodepositing liquid composition an oxidation-reduction potential that is at least 100 mV more oxidizing than a standard hydrogen electrode.