Rheology modifier for improved viscosity loss on tinting in paint formulations containing organo-phosphorus-funcntionalized latexes

A composition comprising:

• (i) polymer particles comprising structural units of an organo-phosphorus monomer;
• and
• (ii) a hydrophobically modified oxyalkylene-urethane polymer having a hydrophobic fragment represented by Structure I:
• where the dotted line represents the point of attachment of the fragment to the hydrophobically modified oxyalkylene-urethane polymer;
• Ar1 is unsubstituted phenyl, naphthyl, phenyl-O—CH2—, phenyl-CH2—O—CH2—, or naphthyl-O—CH2—;
• or phenyl, naphthyl, phenyl-O—CH2—, phenyl-CH2—O—CH2—, or naphthyl-O—CH2— substituted with from 1 to 3 C1-C6 alkyl or alkoxy groups;
• Ar2 is phenyl, phenyl-OCH2CH2—, phenyl-(OCH2CH2)y—, benzyl, naphthyl, naphthyl-CH2—, naphthyl-OCH2CH2— or naphthyl-(OCH2CH2)y—, wherein the phenyl or naphthyl portion of Ar2 is unsubstituted or substituted with from 1 to 3 C1-C6 alkyl groups, and wherein y is from 2 to 10;
• each R1 is independently H or C1-C6-alkyl;
• X is O or NR2, wherein R2 is H, C1-C6-alkyl, phenyl, or benzyl;
• m is from 1 to 20;
• and
• n is from 0 to 100.