Latent catalysts
AssigneeKing Industries, Inc.
InventorsLeonard J. Calbo, Robert D. Coughlin
Life of this patent
Estimating the term…
Abstract
Amino resins, e.g., urea-formaldehyde and melamine-formaldehyde thermosetting resins, are cured with a latent catalyst which is a thermally-decomposable adduct of an aromatic sulfonic acid (e.g., p-toluene sulfonic acid) and a bicyclic oxazolidines (e.g., 1-aza-3,7-dioxa-5-ethylbicyclo (3.3.0) octane. The coating compositions can contain other conventional co-reactants, such as polyols, polyacids, alkyd resins, polyester resins, epoxies, acrylics and the like. Coatings containing the amino resin, co-reactant, and latent catalyst have an acceptable viscosity stability, cure rapidly at temperatures lower than some other latent catalysts, and produce films with no wrinkles.
Claims27
A thermally-decomposable composition comprising a bicyclic oxazolidine adduct of an aromatic sulfonic acid, the adduct having the formula:
- ##STR3## wherein A is phenyl or naphthyl;
- x is 1 to 8;
- y is 0 to 7;
- the sum of x and y is no greater than 8;
- z is 8-x-y when A is naphthyl and z is 6-x-y when A is phenyl;
- q is equal to or greater than about 0.5;
- R is an alkyl, halogen, haloalkyl, or alkoxy group;
- R' is an organic group;
- and R" is hydrogen or a C.sub.1 -C.sub.6 alkyl group.
A composition comprising a curable amino resin and a catalytically effective amount of a thermally-decomposable adduct of an aromatic sulfonic acid and a bicyclic oxazolidine adduct having the general formula:
- ##STR4## wherein A is phenyl or naphthyl;
- x is 1 to 8;
- y is 0 to 7;
- the sum of x and y is no greater than 8;
- z is 8-x-y when A is naphthyl and z is 6-x-y when A is phenyl;
- q is equal to or greater than about 0.5;
- R is an alkyl, halogen, haloalkyl, or alkoxy group;
- R' is an organic radical;
- and R" is hydrogen or a C.sub.1 -C.sub.6 alkyl group.
Dependencies are inferred from the claim text.