Low surface tension surfactants based on amino alcohol and their use
View Patent ↗The invention provides low surface tension surfactants based on amino alcohol and also provides for their use in aqueous coating formulations, said surfactants being preparable by reacting at least one secondary amine of formula (I): with at least one diepoxide of formula (IV): and/or with at least one triepoxide of formula (IV): in essentially equivalent amounts of amine hydrogen atoms and epoxide groups.
1. An amino alcohol of the formula (V) or (VI)
in which
R 1 and R 2 independently of each other are each a branched or unbranched, saturated or unsaturated C 1 -C 30 hydrocarbyl radical, or a group of the formula (II):
R 3 —X—(CH 2 ) a — (II)
in which
R 3 is a branched or unbranched, saturated or unsaturated hydrocarbon C 1 -C 30 group optionally substituted by at least one hydroxyl group and wherein at least one of the carbon atoms is optionally replaced be a heteroatom,
X is a residue selected from the group consisting of —O—C(O)—, —(O)C—O—, —NH—C(O)—, —(O)C—NH, —(CH 3 )N—C(O)—, —(O)C—N(CH 3 )—, —S(O 2 )—O—, —O—S(O 2 )—, —S(O 2 )—NH—, —NH—S(O 2 )—, —S(O 2 )—N(CH 3 )—, and —N(CH 3 )—S(O 2 )—, and
a is an integer between 1 and 4,
m is 1 to 3,
n is 1 to 2,
R 5 is a branched or unbranched, saturated or unsaturated residue with or without a hydroxyl group or other heteroatom substituents and containing 1 to 30 carbon atoms; and
R 6 is a branched or unbranched, saturated or unsaturated residue with or without a hydroxyl group or other heteroatom substituents and containing 1 to 30 carbon atoms.
2. The amino alcohol as claimed in claim 1 wherein
R 1 and R 2 independently of each other are each a branched or unbranched, saturated or unsaturated C 1 -C 10 hydrocarbyl radical, or a group of the formula (II):
R 3 —X—(CH 2 ) a — (II)
in which
R 3 is a branched or unbranched, saturated or unsaturated hydrocarbon C 1 -C 10 group optionally substituted by at least one hydroxyl group,
X is a residue selected from the group consisting of —O—C(O)—, —(O)C—O—, —NH—C(O)—, —(O)C—NH, —(CH 3 )N—C(O)—, —(O)C—N(CH 3 )—, —S(O 2 )—O—, —O—S(O 2 )—, —S(O 2 )—NH—, —NH—S(O 2 )—, —S(O 2 )—N(CH 3 )—, and —N(CH 3 )—S(O 2 )—, and
a is an integer between 1 and 4,
m is >1.5 to 2.54,
n is >1.5 to 2.
3. The amino alcohol as claimed in claim 1 wherein
R 1 and R 2 are independently of one another a branched or unbranched alkylene group having 3 to 6 carbon atoms, anchor R 3 —X—(CH 2 ) a —where R 3 is a branched or unbranched alkyl group having 2 to 8 carbon atoms, X is —(O)C—NH—, and a is 3, and R 5 and R 6 are independently of one another branched or unbranched alkylene groups having 3 to 6 carbon atoms, and
n is 2, and
m is 2.
4. A method for reducing the surface tension in an aqueous formulation while at the same time inhibiting the re-formation of a foam for a long period of time which comprises adding an effective amount of at least one amino alcohol according to claim 1 in amounts from about 0.05% to about 5%.
5. An aqueous formulation which comprises at least one amino alcohol as claimed in claim 1 and water.
6. The aqueous formulation as claimed in claim 5 , which is a surface coating, paint, printing ink or varnish.
7. A car polish which comprises the aqueous formulation according to claim 5 .