Patent ID: 6172167
Filing Date: 2001-01-09
Classification: C08G

Abstract:
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:.paren open-st.CB--VB.paren close-st.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: ##STR9##wherein:X may or may not be present and, if present, represents an oxygen;Z.sub.1 and Z.sub.2 are the same or different and represent a group with the general formula:.paren open-st.(CR'R"").sub.p --Q--(CR'R"").sub.q.paren close-st..sub.x 'wherein x.gtoreq.1;R' and R"" are the same or different and represent an H, CH.sub.3, hydrocarbyl or substituted hydrocarbyl with protected O, N, and/or S functionality;p and q are different or the same and can each be .gtoreq.0, assuming that p+q.gtoreq.1, andQ is selected from the group consisting of hetero-atoms and hetero-atom-containing groups;R.sub.1 represents an H, --OH group or --COOH group; which group has reacted in the general formula I to an ester bond;R.sub.2 is hydrogen or hydrocarbyl or substituted hydrocarbyl with protected O, N, and/or S functionality with a maximum of 30 carbon atoms; andVB 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: ##STR10##wherein R.sup.5 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.