Copoly(ester-amides) and copoly(ester-urethanes)

Biologically degradable copolymers selected from the group consisting of copoly(esteramide) or copoly(esterurethane), which copolymers consist of building blocks with the following general structure:

• [Parenopenst]CB—VB[Parenclosest]
• wherein CB and VB of different building blocks may be the same or different, and CB represents a block with a constant length and the general formula:
• wherein:
• X may or may not be present and, if present, represents an oxygen;
• Z1 and Z2 are the same or different and represent a group with the general formula:
• [Parenopenst](CR′R″)p—Q—(CR′R″)q[Parenclosest]x′
• wherein x≧1;
• R′ and R″ are the same or different and represent an H, CH3, hydrocarbyl or substituted hydrocarbyl with protected O, N, and/or S functionality;
• p and q are different or the same and can each be ≧0, assuming that p+q≧1, and
• Q is selected from the group consisting of hetero-atoms and hetero-atom-containing groups;
• R1 represents an H, —OH group or —COOH group;
• which group has reacted in the general formula I to an ester bond;
• R2 is hydrogen or hydrocarbyl or substituted hydrocarbyl with protected O, N, and/or S functionality with a maximum of 30 carbon atoms;
• and
• VB represents a block with variable length, which block is formed by one or more monomers from the group which consists of alkanediacids, alkanediacid-chlorides, alkanediols, poly(alkane ether)diols, alkanediacid anhydrides, poly(alkane ether) diacidanhydrides, hydroxy acids (lactones), each of which can occur within one variable block in combination with one or more of the others and/or combination with a diisocyanate,
• with the proviso that when CB is a diamidediol, VB does not have the general formula:
• wherein R5 is selected from the group consisting of linear or branched alkylene having 1 or 2 nonadjacent catenary oxygen or sulfur atoms, and alkenylene;
• cycloalkylene and arylene having up to 25 carbon atoms in the cyclic compounds and from 2 to 25 carbon atoms in the non-cyclic, and a and b are independently zero or one.