Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-08-16
1978-08-08
Pertilla, Theodore E.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260834, 427 27, 428416, 428417, 428418, 428436, 428460, C08L 6124, C08L 6302
Patent
active
041056132
ABSTRACT:
High quality, aqueous-based, heat-curable, primer coating compositions substantially free of organic solvents are disclosed. Said primer compositions include (a) from about 30% to about 75% by weight of a resinous binder which is a mixture of (i) from about 10% to about 60% by weight of finely divided epoxy resin, including blends thereof, having a weight average molecular weight of from about 900 to about 8000 and an epoxide equivalent weight of from about 450 to about 4000, and (ii) from about 5% to about 30% by weight of dispersible, methylated methoxymethyl urea resin which is a crosslinking agent having a formaldehyde:urea molar ratio of 2.2-2.8:1, methanol:urea molar ratio of 1.3-2.0:1, and toluene tolerance of at least 50 weight percent, (b) from about 25% to about 70% by weight of water, and, if desired, (c) up to about 30% by weight of pigment, including a combination of pigments. The pH of the coating compositions should be at least about 9, and the pH control or adjustment may be provided, for example, by a water-soluble amine, such as dimethyl ethanol amine. It is desirable for the compositions to include a surfactant. Said coating compositions are particularly suitable for use as adherent, corrosion resistant primers for metal substrates, such as steel and aluminum.
REFERENCES:
patent: 2856094 (1958-10-01), Gloyer et al.
patent: 3509086 (1970-04-01), Rohrbacher, Jr.
patent: 3561003 (1971-02-01), Lanham et al.
patent: 3666138 (1972-05-01), Morris, Jr. et al.
patent: 3844998 (1974-10-01), Jeffery et al.
patent: 3879324 (1975-04-01), Timmons
Clope Richard W.
Glaser Milton A.
Pertilla Theodore E.
The Dexter Corporation
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