Clear coat/color coat finish from a high solids coating composition of a blend of a low molecular weight acrylic polymer and a medium molecular weight acrylic polymer and an alkylated melamine cross-linking agent
Patent 4404248 Issued on September 13, 1983. Estimated Expiration Date: 
December 28, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 28, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 06/334892 filed on 12/28/1981US Classes:428/215, Absolute thicknesses specified427/388.3, Aldehyde-containing precursor427/409, Metal base428/332, Physical dimension specified428/334, Coating layer not in excess of 5 mils thick or equivalent428/335, Up to 3 mils428/460, Next to aldehyde or ketone condensation product428/502Melamine-aldehydeExaminersPrimary: Pertilla, Theodore E.Attorney, Agent or FirmInternational ClassesC09D 133/06 (20060101)C08L 61/20 (20060101) C08L 61/00 (20060101) C08L 33/00 (20060101) C08L 33/06 (20060101) AbstractA substrate that has a finish of a clear coat top layer in firm adherence to a color coat layer containing pigments that is in adherence to the substrate; the clear coat and color coat are formed from a high solids coating composition contains at least 50% by weight of a binder of film-forming constituents in which the constituents are of(A) a medium molecular weight acrylic polymer that has a number average molecular weight of about 5,000-20,000, a hydroxyl content of at least 2% by weight, a glass transition temperature of about -20° C. to +20° C.;(B) a low molecular weight acrylic polymer that has a number average molecular weight of about 500-7,500 a hydroxyl content of at least 2% by weight, a glass transition temperature of about -20° C. to +25° C.; wherein the acrylic polymers are the same or different and contain and alkyl methacrylate, a hydroxy alkyl acrylate or a hydroxy alkyl methacrylate, and optionally, an alkyl acrylate and styrene;(C) an alkylated melamine formaldehyde cross-linking agent; andan acid catalyst;clear coat/color coat finishes are particularly useful as an exterior finish for automobiles, trucks and airplanes.Other References
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