Aqueous Base varnish
Patent No. U.S. 6,565,979 B1
E. I. du Pont de Nemours and Company has been granted a patent for an aqueous base lacquer composition comprising at least one polymer selected from the group consisting of linear polyethylene oxide homopolymers, branched polyethylene oxide homopolymers, linear polypropylene oxide homopolymers, branched polypropylene oxide homopolymers, linear polyethylene/polypropylene oxide copolymers with randomly distributed ethylene oxide and propylene oxide units, branched polyethylene/polypropylene oxide copolymers with randomly distributed ethylene oxide and propylene oxide units. The polymers have terminal hydroxyl groups and, optionally, are partly or completely etherified with C1-C4-alkanols. The polymers have an average molecular weight from more than 1,000 to 8,000. The aqueous base lacquer composition has a solids content comprising 0.5-15% of the polymers. The aqueous base lacquer composition enables a clear lacquer having a reduced wetting limit to be applied over the aqueous base lacquer composition.