Heat activated tertiary amine urethane catalysts
View Patent ↗This invention concerns a compound formed from a tertiary amine-carboxylic acid salt, where the carboxylic acid and tertiary amine are selected such that the catalyst salt is blocked at room temperature and becomes unblocked at an elevated temperature. The compound is useful as a heat activated urethane catalyst.
1. A tertiary amine-carboxylic acid salt that is blocked at room temperature and becomes unblocked at an elevated temperature, wherein the tertiary amine is N,N-dimethyl-2-(2-aminoethoxy)ethanol and the carboxylic acid is oxalic acid.
2. The acid salt of claim 1 , wherein the tertiary amine further comprises N,N-dimethylcyclohexylamine, pentamethyldiethlenetriamine, pentamethyldipropylentriamine, tetramethyldipropylenetriamine, dimethylaminoethoxyethanol, N,N,N′-trimethylaminoethyl-ethanolamine, 2-(dimethylamino)-ethanol, or a combination thereof.
3. The acid salt of claim 1 , wherein the tertiary amine further comprises dimethylaminoethoxyethanol, N,N,N′-trimethylaminoethyl-ethanolamine, 2-(dimethylamino)-ethanol, or a combination thereof.
4. The acid salt of claim 1 , wherein the carboxylic acid further comprises a second carboxylic acid that contains less than 30 carbons.
5. The acid salt of claim 1 , wherein the carboxylic acid further comprises salicylic acid.
6. The acid salt of claim 1 , wherein the tertiary amine and the carboxylic acid are present in a mole ratio of about 1:1.
7. The acid salt of claim 1 , wherein the mole ratio of tertiary amine to carboxylic acid is less than about 1.5.
8. The acid salt of claim 1 , wherein the mole ratio of tertiary amine to carboxylic acid from about 0.9:1 to about 1.1.
9. The acid salt of claim 1 , wherein the acid salt produces a carbonyl absorbance of at 1730-1680 cm −1 of at least 0.5 above 135° C.
10. The acid salt of claim 1 , wherein the mole ratio of tertiary amine to carboxylic acid is less than 2:1.