Novel sulfobetaine monomers, process for preparing same, and uses thereof

A process for preparing a sulfobetaine monomer of formula (V) and/or its acid form comprising reacting:

• a compound of formula (VI), and
• a compound of formula (VII) and/or one of its salts,
• in the presence of a solubilizing agent which is water,
• optionally in the presence of at least one solubilizing agent of the compound of formula (VII), and
• in the presence of at least one solvent, wherein the said solvent is a compound having a melting temperature below 15° C.,
• wherein the reaction is carried out with an amount of polymerization inhibitor of between 10 and less than 500 ppm relative to the total mass of the compounds of formulas (VI) and (VII),
• In formulas (V), (VI) and (VII):
• R1 and R4 are, independently of each other, —H or —CH3,
• R2 and R3 are, independently of each other, a linear C1-C10 alkyl or branched C3-C10 alkyl or linear C2-C10 alkylene group,
• R5 is —H, or a linear C1-C22 alkyl or branched C3-C22 alkyl group, or R5 forms with R6 a C4-C10 carbon ring, optionally branched,
• R6 is a linear C1-C22 alkyl or branched C3-C22 alkyl group, or R6 forms with R5 a C4-C10 carbon ring, optionally branched,
• X1=—COO—, or —CONH— or —CH2—,
• X2=—COO— or —CONH—,
• n is an integer between 0 and 10,
• wherein
• the compound of formula (VI) is chosen from dimethylaminopropyl methacrylamide, dimethylaminopropyl acrylamide, allyldimethylamine, diallylmethyl amine, dimethylaminoethyl methacrylate, and dimethylaminoethyl acrylate;
• the compound of formula (VII) is 2-acrylamido-2-methylpropane sulfonic acid and/or one of its salts;
• and
• the polymerization inhibitor is mono methyl ether of hydroquinone (MEHQ).