Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Reexamination Certificate
2011-06-28
2011-06-28
Tran, Thao T. (Department: 1787)
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
C524S504000
Reexamination Certificate
active
07968206
ABSTRACT:
This invention relates to a method for forming a multi-layer coating, comprising sequentially applying a primer surfacer, a basecoat, and a clear coat composition on an automotive substrate in a wet-on-wet-on-wet manner, and simultaneously curing the applied three layers together in a single baking step, wherein the primer surfacer comprises: a film forming binder, a volatile organic liquid carrier, and pigment(s); and the binder contains about:(a) about 30 to 80% by weight, based on the weight of the binder, of a hydroxyl functional polyester resin;(b) about 10 to 30% by weight, based on the weight of the binder, of a crosslinking agent selected from the group consisting of a melamine resin, a blocked polyisocyanate resin, or a mixture thereof;(c) about 10 to 40% by weight, based on the weight of the binder, of a dispersed graft polymer comprising a non-crosslinked core of acrylic polymer which is substantially non-soluble in non-polar organic solvent and, grafted to the core, one end of an acrylic stabilizer in the form of a macromonomer, said acrylic stabilizer being soluble in a non-polar organic solvent;wherein the composition is, preferably, essentially free of crosslinked nonaqueous dispersion resin particles or crosslinked microgel resin particles or both, and the composition also contains at least one non-polar organic solvent at the time of application.The resulting multi-layered coating film has excellent aesthetic appearance, chipping resistance, sag resistance, and film build even when formed in a three wet layered application method.
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Johnson Jeffery W.
Yuan San C.
E. I. Du Pont de Nemours and Company
Tran Thao T.
Xu Gann G.
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