Polymer composition containing polyhydroxyalkanoate and metal compound

Claim 1

A polymer composition comprising a first component which is a polyhydroxyalkanoate (PHA), a second component which is a different PHA or a synthetic polyester which is a polypropiolactone, polybutyrolactone, polyvalerolactone, polycaprolactone or copolymer thereof, a polyactide, a polyester containing a combination of a dicarboxylic acid component and diol, the dicarboxylic acid component being selected from the group consisting of malonic, succinic, glutaric, adipic, pimelic, azelaic, sebacic, fumaric, 2,2-dimethylglutaric, suberic, 1,3-cyclopentane dicarboxylic, 1,4-dicyclohexane-dicarboxylic, 1,3-cyclohexane dicarboxylic, diglycolic, iraconic, maleic, 2,5-norbornane dicarboxylic, ester forming derivatives thereof and combinations thereof and the diol being selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, 1,3-propanediol, 2,2-dimethyl-1,3-propanediol, 1,3 butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 2,2,-trimethyl-1,6-hexanediol, thiodiethanol, 1,3-cyclobutanediol, triethyleneglycol, tetraethyleneglycol, di-, tri-, tetra-propyleneglycol, combinations thereof, a cellulose, cellulose acetate, cellulose butyrate, and the copolymer of succinic acid and butylene glycol, in which 5% to 90% of each of said first and second components are present by weight and 0.1 to 5 phr of at least one transesterification catalyst which is an oxy compound of a metal from Group 11A or 111A or IVA of the Periodic Table, or of a metalloid having a valency of at least 3 from a B Group of the Periodic Table.