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.
Claims22
A method of forming a polymeric coating on a substrate which comprises applying to the substrate an effective amount of a curable polymeric powder consisting essentially of a polymer containing carboxyl, anhydride, hydroxyl, epoxy or amide functional groups and up to about 35% by weight of said polymer of a low molecular weight crosslinking agent and subsequently curing said polymeric powder onto the substrate at temperatures ranging up to about 400.degree. F.;
- said crosslinking agent characterized as a low molecular weight, non-gelled, solid 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 R 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 radicals 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.