Low-foaming amine oxide surfactant concentrate and method of manufacture
First Claim
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1. A low-foaming amine oxide surfactant concentrate having from about amine oxides and which is pourable at room temperature comprising:
- 50-99% of an amine oxide constituent, such constituent including at least one amine oxide having the general structural formula;
##STR13## wherein R1 is selected from an alkyl group having between 6 and 22 carbon atoms, and a substituted aryl group having between 7 and 22 carbon atoms;
R2 is from 0 to 7 moles of alkoxylated units;
n is 0 or 1; and
R3 and R4 are each at least one alkoxylated unit and the total number of alkoxylated units present in R3 and R4 is about 3.5 to 30; and
less than 50% water, wherein said concentrate is essentially free of organic solvents.
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Abstract
A pourable low-foaming alkoxylated amine oxide surfactant concentrate and method for making the concentrate are disclosed. The amine oxide concentrate has novel properties in that it is both highly concentrated and pourable at ambient temperatures. The amine oxides of the amine oxide concentrate include from about 3.5-30 moles of alkoxylated units and may be based on ether and/or fatty tertiary amine precursors. The low foaming properties and pourability of the amine oxide surfactant concentrate make the invention ideal for low-foam applications and for use in surfactant formulations.
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Citations
22 Claims
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1. A low-foaming amine oxide surfactant concentrate having from about amine oxides and which is pourable at room temperature comprising:
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50-99% of an amine oxide constituent, such constituent including at least one amine oxide having the general structural formula;
##STR13## wherein R1 is selected from an alkyl group having between 6 and 22 carbon atoms, and a substituted aryl group having between 7 and 22 carbon atoms;R2 is from 0 to 7 moles of alkoxylated units; n is 0 or 1; and R3 and R4 are each at least one alkoxylated unit and the total number of alkoxylated units present in R3 and R4 is about 3.5 to 30; and
less than 50% water, wherein said concentrate is essentially free of organic solvents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of making a low-foaming amine oxide surfactant concentrate, said concentrate being essentially free of organic solvents, said concentrate having from about 50-99% actives and being pourable at room temperature comprising the steps of:
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providing a tertiary amine constituent having the general structural formula;
##STR16## wherein R1 is selected from an alkyl group having between 6 and 22 carbon atoms, and a substituted aryl group having between 7 and 22 carbon atoms;R2 is from 0 to 7 moles of alkoxylated units; n is 0 or 1; and R3 and R4 are each at least one alkoxylated unit and the total number of alkoxylated units present in R3 and R4 is about 3.5 to 30; placing the amine constituent in a reaction vessel and heating the amine to a reaction temperature of about 50-70°
C.;adding to the heated amine constituent in the reaction vessel, 100-105 molar percent of hydrogen peroxide present in a solution of water in about equal amounts over a period of about 2-8 hours; reacting the amine and hydrogen peroxide for about 8-48 hours at about 70-80°
C.;adding at any point in the process less than 50% water as necessary to enhance pourability; whereupon a high actives, pourable amine oxide surfactant concentrate is formed. - View Dependent Claims (21, 22)
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Specification