POLYESTER COMPOSITION
A polyester composition includes poly(alkylene furandicarboxylate) and a color-stabilizing agent. The poly(alkylene furandicarboxylate) may be poly(ethylene 2,5-furandicarboxylate). Suitable examples of the color-stabilizing agent in such a composition include the compounds selected from a sterically hindered phenolic compound, a phosphonite compound, a phosphite and combinations thereof. In particular the color-stabilizing agent is a phosphite containing at least one tri-substituted phenyl moiety.
1 . A polyester composition comprising poly(alkylene furandicarboxylate) and a color-stabilizing agent.
2 . The composition according to claim 1 , wherein the color-stabilizing agent is selected from the group consisting of sterically hindered phenolic compounds, phosphonite compounds, phosphites and combinations thereof.
3 . The composition according to claim 2 , wherein the color-stabilizing agent comprises a phosphonite compound, a phosphite or a combination thereof.
4 . The composition according to claim 3 , wherein the color-stabilizing agent comprises a phosphite containing at least one tri-substituted phenyl moiety.
5 . The composition according to claim 1 , wherein the color-stabilizing agent is a phosphite of the formula R′-Q-R″, wherein Q represents a pentaerythritol-phosphite group of formula (III)
and wherein R′ and R″ are 2,6-di(t-butyl)-4-methyl-phenyl groups.
6 . The composition n according to claim 1 , wherein the color-stabilizing agent is present in an amount ranging from 0.01 to 50% wt, preferably from 0.03 to 25% wt, based on the weight of the poly(alkylene furandicarboxylate) and color-stabilizing agent.
7 . The composition according to claim 1 , wherein the poly(alkylene furandicarboxylate) is poly(ethylene 2,5-furandicarboxylate).
8 . The composition according to claim 7 , wherein the poly(ethylene 2,5-furan-dicarboxylate) has a carboxylic end group content in the range of 0 to 122 meq/kg.
9 . The composition according to claim 7 , wherein the poly(alkylene furandicarboxylate) is poly(ethylene 2,5-furandicarboxylate) having a hydroxyl end group content in the range of 30 to 200 meq/kg and/or a furoic acid end group content in the range of 0 to 15 meq/kg.
10 . The composition according to claim 7 , wherein the poly(ethylene 2,5-furandicarboxylate) has a molecular weight expressed as intrinsic viscosity (IV) of at least 0.75 dug, preferably an IV in the range of 0.75 to 1.2 dL/g.
11 . The composition according to claim 7 , wherein the poly(ethylene 2,5-furandicarboxylate) has a crystallinity of at least 40 J/g, measured by Differential Scanning Calorimetry (DSC).
12 . The composition according to claim 7 , wherein the poly(ethylene 2,5-furandicarboxylate) has a melting point of at least 215° C.
13 . The composition according to claim 7 , wherein the poly(ethylene 2,5-furandicarboxylate) has an acetaldehyde content of at most 1 mg/kg, preferably at most 0.5 mg/kg.