One-package polyurethane top coat composition

Stock material or miscellaneous articles – Composite – Of polyamidoester

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4284258, 4274071, 427409, 525124, 525127, 525131, 525157, 525509, 525520, B32B 2700

Patent

active

059810742

ABSTRACT:
A non-yellowing one-package polyurethane coating composition containing an oxime-blocked polyisocyanate, an isocyanate-reactive material, and an imino-functional amino resin is provided. The coating composition is applied onto an acid-cured base coat and cured. The clear coat produced in this manner has good yellowness resistance and intercoat adhesion.
Articles such as multi-layered coated substrates are prepared using the coating method of this invention. The coated substrates typically contain an acid-cured first layer and an adjacent layer derived from a curable composition containing an oxime-blocked polyisocyanate, an isocyanate-reactive material, and an imino-functional amino resin.

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patent: 4846946 (1989-07-01), Mauer et al.
patent: 4873298 (1989-10-01), Ryntz
patent: 5155201 (1992-10-01), Gardon et al.
patent: 5178915 (1993-01-01), Moyle et al.
International Search Report for International Patent Application No. PCT/US94/00431.
"High Solids Amino Crosslinking", brochure of American Cyanamid Company (1991).
Nylen and Sunderland, Modern Surface Coatings, Interscience Publishers (1965) pp. 189-196.

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