Crosslinking agent for powder coatings
AssigneeThe Sherwin-Williams Company
InventorsGreg D. Shay, James H. Griffith
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Abstract
This invention is directed to low molecular weight, solid addition products having a softening point above 100.degree. F. and the method of preparing same and more particularly to the use of said addition products as crosslinking agents in various polymeric powder coatings, e.g. polyesters. The solid, low molecular weight products are derived from the addition reaction of at least one monohydroxy, single-ring aromatic carbon compound and hexakis (alkoxymethyl) amino-triazine.
Claims12
A curable polymeric powder coating consisting essentially of a polymer containing unreacted carboxyl, anhydride, hydroxy, epoxy or amide functional groups and an effective amount ranging up to about 35% by weight of said polymer of a low molecular weight solid crosslinking agent;
- said crosslinking agent characterized as a non-gelled addition product having a softening point above 100.degree. F. obtained by reacting
- (a) approximately 1.8 to 2.2 moles of at least one monohydroxy aromatic compound having the formula:
- ##STR11## wherein the substituents R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are either the same or different and are selected from the class consisting of hydrogen, alkyl radicals of 1 to 4 carbon atoms, alkoxy radicals of 1 to 4 carbon atoms and NO.sub.2 radicals provided that at least one of the R substituents is hydrogen and
- (b) approximately 1.0 mole of an amino-triazine having the formula:
- ##STR12## wherein the R substituents R.sub.6, R.sub.7, R.sub.8, R.sub.9, R.sub.10 and R.sub.11 are either the same or different and are alkyl radicals of 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.