Salt-free aqueous dispersions of water soluble (co) polymers based on cationic monomrs, method for making same and uses thereof

A salt-free aqueous dispersion of a water-soluble copolymer obtained from a monomer composition comprising, per 100 parts by moles:

• (a) from 0.5 to 99.5 parts by moles of at least one monomer of formula (I):
• 14
• in which:
• R1 represents H or —CH3;
• R2 represents —CH3;
• —C2H5;
• —C3H7 or —C4H9;
• and
• the compound (I) is optionally quaternized on one of the nitrogens, which is symbolized by the fact that the R3, X− and + entities associated with this nitrogen are between square brackets;
• when the compound (I) is quaternized on just one nitrogen, R3 and X− have the following meanings:
• (1) R3 represents —CH2C6H5;
• and X− represents Cl− or CH3OSO3−;
• or
• (2) R3 represents —(CH2)pCH3 with p an integer from 3 to 11;
• and X− represents Br− or I−;
• when the compound (I) is quaternized on both nitrogens, the two X− entities can be identical or different and the two R3 entities can be identical or different, in which case:
• (3) R3 represents —CH2—C6H5;
• and X− represents Cl−;
• or
• (4) R3 represents —(CH2)pCH3 with p an integer from 3 to 11;
• and X− represents Br− or I−;
• (5) among the compounds (I) quaternized on both nitrogens and having the two R3 entities different, if one of the R3 entities represents —CH3, —C2H5 or —C3H7;
• and X− represents Cl− or CH3OSO3−, the other represents —CH2C6H5, the associated X− representing Cl−, or represents —(CH2)pCH3 with p an integer from 3 to 11, the associated X− representing Br− or I−;
• (b) from 99.5 to 0.5 parts by moles of at least one water-soluble monomer chosen from:
• those of formula (II):
• 15
• in which:
• R8 represents H or —CH3;
• R9 and R10, which are identical or different, each independently represent H or C1-5 alkyl;
• those of formula (III):
• 16
• in which:
• R11 represents H or —CH3;
• A1 represents —O— or —NH—;
• B1 represents —CH2CH2—, —CH2CH2CH2— or —CH2CHOHCH2—;
• R12, R13 and R14 each independently represent hydrogen, C1-C6 alkyl, C1-C6 hydroxyalkyl, C5-C12 cycloalkyl, C6-C12 aryl or C7-C12 alkylaryl;
• X1− represents a monovalent anion;
• carboxylic acids comprising ethylenic unsaturation, sulfuric acids comprising ethylenic unsaturation, sulfonic acids comprising ethylenic unsaturation, and their derivatives;
• those of the formula (IV):
• 17
• in which:
• R1 represents H or —CH3;
• R2 represents —CH3;
• —C2H5 or —C3H7;
• and
• the compound (IV) is optionally quaternized on one of the nitrogens, which is symbolized by the fact that the R3, X− and + entities associated with this nitrogen are between square brackets;
• R3 represents —CH3, —C2H5 or —C3H7;
• and
• X− represents Cl− or CH3OSO3−;
• and
• when the compound (IV) is quaternized on both nitrogens, the two X− entities can be identical or different and the two R3 entities can be identical or different;
• it being possible for said monomer composition to include, per 100 parts by moles of (a)+(b):
• (c) up to 30 parts by moles of at least one hydrophobic monomer;
• and/or
• (d) up to 10 parts by moles of at least one crosslinking monomer;
• (e) up to 30 parts by moles of at least one amphiphilic monomer.