| 摘要 |
A charge imbalanced composition comprising: (a) about 10 to 90 mole % of an amphoteric copolymer having the formula <IMAGE> where R=alkyl C1-C4, N=1-6, R1 and R2 are independently alkyl C1-C6, and R3 is H, (b) about 10 to 90 mole % of a polymeric diacid having the formula: <IMAGE> where R is as defined above, and (c) less than about 8 mole % of by-product salts which are the dialkylaminoalkylamine salts of (a) and (b). The composition 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 compound having the formula <IMAGE> where n, R1 and R2 are as defined above, and R3 is H, isolating the product, and hydrolyzing any residual anhydride compound in water to the corresponding diacid compound. |
