Curing amino resins with aromatic sulfonic acid oxa-azacyclopentane adducts
AssigneeKing Industries, Inc.
InventorLeonard J. Calbo
Life of this patent
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Abstract
Amino resins, e.g., urea-formaldehyde and melamine-formaldehyde thermosetting resin systems, are cured with thermally-decomposable adducts of aromatic sulfonic acids and oxa-azacyclopentanes. The resin products cured with these adducts provide surface coatings having superior water resistance properties. The cured compositions can include other conventional ingredients capable of co-reacting with the amino resins, such as polyols, polyacids, alkyd resins, polyester resins, epoxies, acrylics and the like, to provide compositions curable to products having a wide range of properties.
Claims26
A composition comprising a convertible amino resin selected from the group consisting of amino- or imino-group containing compounds condensed with an aldehyde, dialdehyde and aldehyde precursor and a catalytically effective amount of a thermally-decomposable adduct of an aromatic sulfonic acid, said adduct being of the general formula:
- ##STR3## wherein A is phenyl or naphthyl and x is a whole number of from 1 to 8, y is a whole number of from 0 to 7, the sum of x and y being no greater than 8, and z is 8-x-y when A is naphthyl and 6-x-y when A is phenyl;
- q is a positive number equal to or greater than about 0.5;
- R is alkyl, halogen, haloalkyl or alkoxy;
- and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and R.sup.7, independently, are hydrogen, alkyl, halogen, haloalkyl or alkoxy.
A coating composition, the constituents of which comprise (i) an alkoxylated melamine formaldehyde resin;
- and (ii) a dinonylnaphthalene disulfonic acid.multidot.oxa-azacyclopentane adduct wherein the acid component of the adduct comprises 0.1-6% by weight, based on the weight of resin solids.
Dependencies are inferred from the claim text.