BLOCK COPOLYMERS OF POLYETHYLENGLYCOL-POLIORTOESTER, POLYETHYLENGLYCOL-POLYETHYL-POLYETHYLENE POLYCHETHYL-POLYETHYL-POLYETHYL-POLIORTOESTER.

摘要

A block copolymer of formula I: formula II: or formula III: wherein: m and n are independently an integer of 5 to 500; or and q are independently an integer from 5 to 100; R1 is (C1-C4) alkyl; R2 is (C1-C4) alkyl; R3 is H or (C1-C4) alkyl; and A is -O-R4-, -O-R5-, or a mixture thereof; where: R4 is selected from where t is an input from 1 to 12, R6 is (C1-C4) alkyl, and R7 is H or (C1-C4) alkyl and R5 is where: X is an integer from 1 to 10, and R8 is H or (C1-C6) alkyl.