| abstract |
The invention described herein provides a mixture comprising a polymer molecule or salt thereof wherein the polymer molecule in the mixture comprises covalently bonded subunits L, K, and M, wherein the average molecular weight of the polymer molecules in the mixture Is from about 50 kDa to about 200 kDa, and the molar percentage of subunit M relative to the total amount of subunits in the mixture is about 90.5 to about 96 mole%, and the molar percentage of subunit K relative to the total amount of subunits in the mixture Is from about 2.8 to about 7.3 mole percent, and the mole percentage of subunit L relative to the total amount of subunits in the mixture is from about 1.2 to about 2.2 mole percent. |