Back to results
US 10,479,762 B1Granted
Zwitterionic surfactant containing ethoxylate units
AssigneeKing Fahd University of Petroleum and Minerals
InventorsSyed M. Shakil Hussain, Muhammad Shahzad Kamal
Life of this patent
Estimating the term…
Abstract
Zwitterionic surfactants having a sulfonate head group and an ethoxylated alkyl tail. A method for synthesizing the surfactants via amidation of an ethoxylated carboxylic acid and an amine catalyzed by a fluoride salt as well as a sulfonation reaction using a sultone is provided.
Claims20
A surfactant of formula (I)
- or a tautomer thereof, or a stereoisomer thereof;
- wherein:
- R1 and R2 are independently selected from the group consisting of a hydrogen, an optionally substituted alkyl, and an optionally substituted cycloalkyl;
- R3 and R4 are independently selected from the group consisting of an optionally substituted alkyl, and an optionally substituted cycloalkyl;
- n is an integer in a range of 1-15;
- x is an integer in a range of 5-21;
- y is an integer in a range of 2-5;
- and
- z is an integer selected from 3 and 4.
6 more elements
Dependencies are inferred from the claim text.