| abstract |
PCT No. PCT/FI97/00675 Sec. 371 Date May 27, 1999 Sec. 102(e) Date May 27, 1999 PCT Filed Nov. 7, 1997 PCT Pub. No. WO98/21263 PCT Pub. Date May 22, 1998The invention relates to a process for the polymerization or copolymerization of cyclic lactones of hydroxy acids by using as catalysts organometallic iron compounds containing iron salts or iron esters of carboxylic acids having at maximum 18 carbon atoms or some iron complexes. The invention relates preferably to the polymerization of lactide by using an iron acetate catalyst or initiator. |