Novel prepolymers useful in biomedical devices

a prepolymer material described by the general chemical formulae

• E(*D*A*D*G).sub.a *D*A*D*E' or
• E(*D*G*D*A).sub.a *D*G*D*E'
• where
• A denotes a divalent polymeric radical chosen from the group of diradicals consisting of:
• ##STR14## wherein R.sup.P denotes a straight or branched alkyl group with 1 to 6 carbon atoms and n provides for a moiety weight of the radical between 2000 and 10,000;
• R.sup.F denotes a fluorinated straight or branched alkyl radical with 1 to 6 carbon atoms and m provides a moiety weight of between 400 and 10,000;
• R.sup.S denotes an alkyl radical or a short chain fluorinated alkyl radical with 1 to 3 carbon atoms;
• and
• p provides a moiety weight of 400 to 10,000;
• D denotes an alkyl diradical, an alkyl cycloalkyl diradical, a cycloalkyl diradical, an alkylaryl diradical or an aryl diradical, with 6 to 30 carbon atoms;
• G denotes an alkyl diradical, a cycloalkyl diradical, an alkyl cycloalkyl diradical, an aromatic diradical or an alkylaromatic diradical with 1 to 40 carbon atoms which may have ether, thio, or amine linkages in the main chain;
• * denotes a urethane or ureido linkage;
• and
• E and E' denote polymerizable unsaturated organic radicals represented by the general chemical formula ##STR15## wherein R.sup.1 denotes a divalent alkylene radical with 1 to 10 carbon atoms;
• R.sup.2 denotes a --H or --CH.sub.3 radical;
• R.sup.3 denotes a --H radical or an alkyl radical with 1 to 6 carbon atoms or a ##STR16## radical where Y is --O--, --S-- or --NH-- and R.sup.4 denotes an alkyl radical with 1 to 12 carbon atoms;
• Z is --O--, or --NH--
• X denotes ##STR17## or ##STR18## AR denotes an aromatic radical with 6 to 30 carbon atoms;
• a is at least 1;
• w is 0 to 6;
• x is 0 or 1;
• y is 0 or 1;
• and
• z is 0 or 1.