Random block copolymers having the formula: ##STR1## wherein R.sub.1 is --CH.dbd.CH-- or (--CH.sub.2 --).sub.j, in which j is zero or an integer from one to eight; R.sub.2 is selected from hydrogen, straight and branched alkyl and alkylaryl groups containing up to 18 carbon atoms and derivatives or biologically...http://www.google.de/patents/US5658995?utm_source=gb-gplus-sharePatent US5658995 - Copolymers of tyrosine-based polycarbonate and poly(alkylene oxide)
