Patent ID: 9737607
Date: 2017-08-22
CPC Classifications: A61K,C08G

Claim:
1. A polymer, comprising a first repeating unit, a second repeating unit, and a third repeating unit, wherein the first repeating unit is the second repeating unit is wherein R 1 is C 1-6 alkyl group; and, the third repeating unit is wherein X is and Y is hydrophilic polymeric moiety, wherein the hydrophilic polymeric moiety is polyethylene glycol moiety, methoxy polyethylene glycol moiety, polyvinylpyrrolidone moiety, polyacrylic acid moiety, or polymethacrylic acid moiety, wherein the first repeating unit has a weight percentage of 5-50 wt %, the second repeating unit has a weight percentage between 10-55 wt %, and the third repeating unit has a weight percentage between 25-75 wt %, based on the total weight of the first repeating unit, the second repeating unit, and the third repeating unit, wherein the hydrophilic polymeric moiety has a grafting ratio between 0.1% and 10%.