2, 5-FURANDICARBOXYLIC ACID-BASED POLYESTERS
The invention is directed to a polyester comprising 5-furandicarboxylic acid moieties (A); ethylene glycol moieties (B); 1,4:3,6-dianhydrohexitol moieties (C); alicyclic diol moieties other than the 1,4:3,6-dianhydrohexitol moieties (D); wherein the molar ratio (B)/[(B)+(C)+(D)] is greater than 0.2. The invention aloes relates to a process of preparing the polyester and to its use.
1 . A polyester comprising:
2,5-furandicarboxylic acid moieties (A);
ethylene glycol moieties (B);
1,4:3,6-dianhydrohexitol moieties (C); and
alicyclic diol moieties other than the 1,4:3,6-dianhydrohexitol moieties (D);
wherein the molar ratio (B)/[(B)+(C)+(D)] is greater than 0.2.
2 . The polyester according to claim 1 , wherein the 1,4:3,6-dianhydrohexitol (C) is selected from isosorbide, isomannide, isoidide or mixtures thereof.
3 . The polyester according to claim 2 , wherein the 1,4:3,6-dianhydrohexitol (C) is isosorbide.
4 . The polyester according to claim 1 , wherein the alicyclic diol other than 1,4:3,6-dianhydrohexitol (D) is selected from 1,4-cyclohexanedimethanol, 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol or a mixture thereof.
5 . The polyester according to claim 4 , wherein the wherein the alicyclic diol other than 1,4:3,6-dianhydrohexitol (D) is 1,4-cyclohexanedimethanol.
6 . The polyester according to claim 1 , wherein the molar ratio [(B)/[(B)+(C)+(D)] does not exceed 0.8, preferably the molar ratio (B)/[(B)+(C)+(D)] is from 0.35 to 0.75.
7 . The polyester according to claim 1 , wherein the molar ratio (A)/[(B)+(C)+(D)] is 0.8 to 1.2.
8 . The polyester according to claim 1 having a glass transition temperature of at least 80° C., preferably at least 85° C.
9 . A process of preparation of the polyester according to claim 1 comprising the following steps:
introducing into a reactor monomers comprising 2,5-furandicarboxylic acid or a diester, preferably C 1 -C 2 alkyl diester, thereof (A), ethylene glycol (B), at least one 1,4:3,6-dianhydrohexitol (C), and at least one alicyclic diol other than the 1,4:3,6-dianhydrohexitol (D), and a catalyst, the molar ratio (B)/[(B)+(C)+(D)] being greater than 0.2 and the monomers not comprising aliphatic dicarboxylic acid or a diester thereof and/or terephthalic acid or a diester thereof;
polymerizing the monomers, said step comprising:
oligomerization of the monomers by esterification or transesterification during which the reaction mixture is stirred under inert atmosphere at a temperature of 140° C. to 230° C., preferably 160° C. to 220° C. to produce oligomers;
polycondensation of the oligomers during which the oligomers are stirred under vacuum at a temperature of 230° C. to 300° C., preferably 240° C. to 280° C.; and
collecting the resulting polyester.
10 . A composition comprising the polyester according to claim 1 , the composition optionally comprising at least one additive and/or at least one additional polymer.
11 . A plastic article comprising the polyester according to claim 1 .