Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1972-08-18
1977-09-20
Hayes, Lorenzo B.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 296TA, 260 296MN, 260 332R, 260 334R, 260 39P, 260 4221, 260851, 260856, C08L 6120
Patent
active
040496074
ABSTRACT:
A heat-convertible water-soluble coating compostion comprising a partially neutralized tertiary alkanol amine salt of a film-forming addition copolymer of a C.sub.2 -C.sub.8 alkyl acrylate and about 8-15% of acrylic acid which may contain up to 5% of acrylamide. Neutralization is carried out in a small amount of water-miscible organic solvent selected from the group consisting of cellosolve acetate, butyl cellosolve, butanol and mixtures of these. The partially neutralized salt is adapted to cross-link with aminoplast when coated from water medium on a heat resistant substrate at 275.degree.-350.degree. F. The reactive cross-linking aminoplast is also water-soluble and is selected from the group consisting of melamine formaldehyde resin, urea-formaldehyde resin, guanidine formaldehyde resin and the alcohol-modified derivatives of the foregoing aminoplasts. The partially neutralized salt provides the tertiary alkanolamine at a preferred level of 61-65%. In a preferred polymer embodiment, the acid number of the copolymer lies between about 95 to about 125 and the copolymer which is dissolved in the special solvent is simply diluted with water so as to be useful per se as a primer coating for wood, metal, paper, etc., and specially useful with the heat reactive aminoplast as a metal enamel. Enamel coatings have outstanding shelf stability, total solubility in water, outstanding gloss, and superior hardness, excellent impact resistance, good adhesion and excellent bend resistance when compared to a standard alkyl-melamine coating which is applied from conventional organic solvents.
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Hayes Lorenzo B.
ISIS Chemicals, Inc.
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