Polymer compositions comprising a vinyl polymer and a combination of at least two metal complexes wherein the complexing agent of the first complex is attached to the metal through oxygen and the metal is a transition metal, and the complexing agent of the second complex is attached to the metal through...http://www.google.com.au/patents/US4939194?utm_source=gb-gplus-sharePatent US4939194 - Controllably and swiftly degradable polymer compositions and films and other products made therefrom
