Patent ID: 9447239
Filing Date: 2016-09-20
CPC Classification: B01D,C02F,C08G,Y02P

Claim Text:
1. A thermosensitive copolymer, comprising: a first repeating unit and a second repeating unit, the first repeating unit having a temperature-sensitive oligomer, the second repeating unit having an ionic moiety and a counter ion bonded to the ionic moiety, the temperature sensitive oligomer being grafted onto the first repeating unit, and the first repeating unit and the second repeating unit being linked to form a polyamino acid backbone; wherein the first repeating unit is represented by Chemical Formula 6-1, and the second repeating unit is represented by Chemical Formula 6-2, A R (a) each independently, but not simultaneously, being hydrogen, (b) a chemical group, the chemical group is selected from the group consisting of at least one of a linear or branched C1 to C6 alkyl group, C3 to C7 cycloalkyl group, and a C6 to C10 aryl group, or (c) combinable to form a nitrogen containing heterocycle, R Ak being a linear or branched C1 to C10 alkyl group, R independently being hydrogen or a C1 to C3 alkyl group, wherein, a mole ratio of the first repeating unit to the second repeating unit is about 1:99 to about 40:60, and the thermosensitive copolymer has a lower critical solution temperature (LCST) of about 10° C. to about 50° C. at a concentration of 0.01 g/ml, and the copolymer is structured to dissolve in water at a temperature lower than 10° C.