Tertiary aminoalcohols as low VOC additives for paints and coatings
View Patent ↗Provided are polyhydroxy-diamine compounds for use as neutralizing agents for paints and coatings. The compounds are of the formula (I): and salts thereof, wherein R 1 and R 2 are as defined herein.
1. A method for reducing the volatile organic compound content of an aqueous based paint or coating that contains a neutralizing agent, a binder, water, and a pigment, the method comprising using as the neutralizing agent an effective amount of a compound of formula (I):
or salt thereof, wherein R 1 and R 2 are independently C 1 -C 10 alkyl.
2. A method according to claim 1 wherein R 1 is C 1 -C 6 alkyl.
3. A method according to claim 1 wherein R 1 is C 1 -C 4 alkyl.
4. A method according to claim 1 wherein R 2 is C 1 -C 6 alkyl.
5. A method according to claim 1 wherein R 2 is C 1 -C 4 alkyl.
6. A method according to claim 1 wherein R 1 and R 2 are both selected from methyl, ethyl, and propyl.
7. A method according to claim 1 wherein the compound of formula (I) is: 2-(dimethylamino)-2-(hydroxymethyl)-1,3-propanediol; 2-(diethylamino)-2-(hydroxymethyl)-1,3-propanediol; 2-(dipropylamino)-2-(hydroxymethyl)-1,3-propanediol; or 2-[bis(2-methylpropyl)amino]-2-(hydroxymethyl)-1,3-propanediol.
8. A method according to claim 1 wherein the compound of formula (I) is: 2-(dimethylamino)-2-(hydroxymethyl)-1,3-propanediol.
9. An aqueous based paint or coating comprising a neutralizing agent, a binder, a carrier, and a pigment, wherein the neutralizing agent is a compound of formula (I):
or salt thereof, wherein R 1 and R 2 are independently C 1 -C 10 alkyl.
10. An aqueous based paint or coating according to claim 9 further comprising one or more additional ingredients selected from: leveling agents, surfactants, rheology modifiers, co-solvents, corrosion inhibitors, defoamers, co-dispersants, additional aminoalcohol compounds, and biocides.
11. A method according to claim 1 wherein R 1 is methyl, ethyl or propyl.