| 摘要 |
A charge imbalanced polymer comprising: (a) about 10 to 90 mole % of polymeric units having the formulas <IMAGE> (A) and <IMAGE> (B) where A is present in an amount of about 0.1-0.8 mole, and B is present in an amount of about 0.05-0.4 mole, and where A is 2-6 times B, where R=C1-C4 alkyl, n=1-6, R1 and R2 are independently C1-C6 alkyl, R3 is H or lower alkyl, and R4=C12-C24 alkyl; and (b) about 10 to 90 mole % of a polymeric diacid units having the formula: <IMAGE> where R is as defined above, and (c) about 0-20 mole % of by-product salts which are the dialkylaminoalkylamine and alkylamine salts of acid units of (a) and (b). The charged imbalanced polymer described above is made by: reacting 1 mole of an anhydride compound having the formula <IMAGE> where R is as defined above, with less than 1 mole of a mixture of about 0.1-0.8 mole of a compound having the formula <IMAGE> (A) where n, R1, R2 and R3 are as defined above, and about 0.05-0.4 of a compound having the formula <IMAGE> (B) where R4 is defined above, and where A is 2-6 times B, isolating the product, and hydrolyzing any residual anhydride compound in water to the corresponding diacid compound. |
