Composition comprising a polyester-polyether polymer, a transition metal catalyst, and an active material

A polymer composition, comprising:

• a polyether-polyester copolymer in a form of a powder having a mass median diameter D50 of less than 1000 μm,
• a transition metal catalyst, and
• a desiccant comprising one or more of a silica gel, a zeolite, a desiccant clay, an activated carbon, an alkali metal salt, an alkaline earth metal salt, and mixtures thereof in an amount of 0.1 wt.-% or more,
• wherein the polyether-polyester copolymer comprises:
• polyether segments wherein at least one polyether segment contains at least one polytetramethylene oxide segment;
• (ii) polyester segments;
• (iii) bridging elements of the structure —CO—R2-CO—, wherein R2 represents an optionally substituted bivalent hydrocarbon residue consisting of 1 to 100 carbon atoms;
• and
• (iv) one or two end-caps having a formula selected from:
• wherein the different monomers are distributed randomly, in blocks, or in a combination of random and block, and
• R1 is an optionally substituted aliphatic hydrocarbon residue of 1 to 24 carbon atoms, an optionally substituted olefinic hydrocarbon residue of 2 to 24 carbon atoms, or an optionally substituted aromatic hydrocarbon residue of 6 to 14 carbon atoms;
• said hydrocarbon residues are optionally substituted with one or more groups independently selected from the group consisting of C1-C5-alkoxy, nitro, cyano, sulfo, and combinations thereof;
• b is an integer between 1 and 250;
• a is an integer between 1 and 250;
• and
• c is an integer between 1 and 70.