| http://www.w3.org/ns/prov#value | - Examples of such acid releasing agents include degradable polyesters such as polylactic acid, polyglycolic acid, polyacrylic acid and copolymers or blends thereof, poly-??-hydroxybutyrate, polylactone, and an anhydride or phosphate ester blended with or grafted to polypropylene, polyethylene or polystyrene, or trimethylsilyl phosphate esters of the formulae CH3SiOP(O) (OR)2 wherein R is a non-hydr
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