Patent ID: 8058377

Claim:
A polymer dispersant composition, comprising: a polymer made from the following monomer groups: (a) polyoxyalkylene monomer represented by structural formula wherein each of R 1 and R 2 individually represent a hydrogen atom or methyl group; R 3 represents hydrogen or â€”(CH 2 ) m (CO) n O(AO) p X 1 group; AO represents an oxyalkylene group having 2 to 4 carbon atoms; â€œmâ€ represents an integer of 0 to 2; â€œnâ€ represents an integer of 0 or 1; â€œpâ€ represents an average number of the total oxyalkylene groups added and is an integer of from 5 to 200; and X 1 represents a hydrogen atom or alkyl group, respectively; (b) acrylic acid monomer represented by structural formula wherein each of R 4 , R 5 â€² and R 6 individually represent a hydrogen atom, a methyl group or â€”(CH 2 ) q C(O)OM 1 , respectively; â€œqâ€ represents an integer from 0 to 2; M 1 represents a hydrogen atom, an alkali metal, or an alkali earth metal, respectively; (c) phosphate monoester monomer represented by structural formula wherein R 7 represents a hydrogen atom or a methyl group; R 8 represents an alkylene group having 2 to 4 carbon atoms; â€œrâ€ is an integer of from 1 to 30; M 2 represents a hydrogen atom, an alkali metal or an alkali earth metal, respectively; and (d) phosphate diester monomer represented by structural formula wherein each of R 9 and R 11 individually represent a hydrogen atom or methyl group; each of R 10 and R 12 individually represent an alkylene group having 2 to 4 carbon atoms; each of â€œsâ€ and â€œtâ€ individually represent an integer of from 1 to 30; M 3 represents a hydrogen atom, an alkali metal or an alkali earth metal, respectively; and (e) phosphate triester monomer represented by structural formula wherein each of R 13 , R 15 , and R 17 individually represent a hydrogen atom or methyl group; R 14 , R 16 and R 18 each individually represent an alkylene group having 2 to 4 carbon atoms; each of â€œwâ€, â€œxâ€ and â€œyâ€ individually represent an integer of from 1 to 30, respectively; and wherein the foregoing monomers (a), (b), (c), (d), and (e) are present in the following molar ratios, whereby the numerator and denominator numbers in a given range add up to 100, as follows: (i) the molar ratio of monomers (a)+(b) to monomers (c)+(d)+(e) is in the range of 94-98/2-6; (ii) the molar ratio of monomer (a) to monomer (b) is in the range of 20-60/40-80; (iii) the molar ratio of monomer (c) to monomers (d)+(e) is in the range of 50-100/0-50; and (iv) the molar ratio of monomers (d) and (e) to all monomers (a) through (e) is in the range of 0-2/98-100.