초록

and combinations thereof wherein R.sub.12 contains an internal amine or internal amide group.

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[ We claim:] [1.] A polyoxaester copolymer comprising a polyoxaester copolymer having a first divalent repeating unit of formula IA:EQU [--O--C(O)--R.sub.30 --C(O)--] IA econd divalent repeating unit of the formula IB:EQU [O--C(O)--C(R.sub.1)(R.sub.2)--O--R.sub.3 --O--C(R'.sub.1)(R'.sub.2)--C(O)--]

[ We claim:] [1.] A polyoxaester copolymer comprising a polyoxaester copolymer having a first divalent repeating unit of formula IA:EQU [--O--C(O)--R.sub.30 --C(O)--] IA econd divalent repeating unit of the formula IB:EQU [O--C(O)--C(R.sub.1)(R.sub.2)--O--R.sub.3 --O--C(R'.sub.1)(R'.sub.2)--C(O)--] IB a third repeating unit selected from the group of formulas consisting of:EQU [--O--R.sub.12 --].sub.U, XIV rein therein R.sub.30 is an alkylene, arylene, arylalkylene, substituted alkylene, substituted arylene and substituted alkylarylene provided that R.sub.30 cannot be --[C(R.sub.1)(R.sub.2)].sub.1-2 --O--(R.sub.3)--O--[C(R'.sub.1)(R'.sub.2)].sub.1-2 --; R.sub.1, R'.sub.1, R.sub.2 and R'.sub.2 are independently hydrogen or an alkyl group containing 1 to 8 carbon atoms; R.sub.3 is an alkylene unit or is an oxyalkylene group of the following formula:EQU --[(CH.sub.2).sub.C --O--].sub.D --(CH.sub.2).sub.E -- IV rein C is an integer in the range of from 2 to about 5, D is an integer in the range of from about 0 to about 2,000, and E is an integer in the range of from about 2 to about 5, except when D is zero in which case E will be an integer from 2 to 12; R.sub.12 is an alkylene unit containing from 2 to 8 carbon atoms and containing an internal amine (--N(R.sub.10)--) or amide (--N(R.sub.11)--); R.sub.10 and R.sub.11 are independently hydrogen or an alkyl group containing 1 to 8 carbon atoms; and U is an integer in the range of from 1 to about 2,000.