Use of organic phosphonic or phosphinic acids, or of oxides, hydroxides or carboxylic acid salts of metals as thermal stabilizers for plasticized polyhydroxyalcanoates

摘要

The invention provides for the use of a compound selected from (a) a compound having the structural formula:
where R' is R or OH, and R is a branched or unbranched saturated C 1 -C 30 group, a branched or unbranched unsaturated C 2 -C 30 group, an aromatic group, or a saturated or unsaturated cycloaliphatic group; or (b) oxides, hydroxides, and saturated or unsaturated carboxylic acid salts of metals from Groups I to V of the Periodic Table; as a thermal stabilizer of polyhydroxyalkanoate (PHA) by including the compound in a PHA-containing composition for forming a pellet to inhibit the degradation of PHA during exposure of the composition to temperatures which cause PHA degradation, wherein the PHA-containing composition comprises a plasticizer compound selected from phosphoric acid derivatives, phosphonic acid derivatives and phosphites.