Aliphatic polyester polyether copolymer, process for producing the same and aliphatic polyester composition using the copolymer
View Patent ↗An aliphatic polyester polyether copolymer is provided having an aliphatic polyester moiety comprising 35 to 50 molar % of an aliphatic diol unit, 35 to 50 molar % of an aliphatic dicarboxylic acid unit and 0 to 30 molar % of an aliphatic oxycarboxylic acid unit and a polyether moiety, wherein η sp /C is not less than 1.40 and the ratio by weight of the polyether moiety to the aliphatic polyester polyether copolymer is 0.1 to 90% by weight.
1. An aliphatic polyester polyether copolymer, which comprises:
an aliphatic polyester moiety, comprising:
35 to 50 molar % of an aliphatic diol unit,
35 to 50 molar % of an aliphatic dicarboxylic acid unit, and
0 to 30 molar % of an aliphatic oxycarboxylic acid unit; and
poly-1,3-propanediol represented by the following formula:
wherein η sp /C is not less than 1.40 and the ratio by weight of said poly-1,3-propanediol to the aliphatic polyester polyether copolymer is 0.1 to 90% by weight.
2. The aliphatic polyester polyether copolymer according to claim 1 , wherein said aliphatic polyester moiety is an aliphatic polyester comprising 35 to 49.9 molar % of an aliphatic diol unit, 35 to 49.95 molar % of an aliphatic dicarboxylic acid unit and 0.1 to 30 molar % of an aliphatic oxycarboxylic acid unit.
3. The aliphatic polyester polyether copolymer according to claim 1 , wherein a monomer unit having at least three hydroxyl groups and/or carboxyl groups is contained within a range of from 0.001 molar % to 5 molar % to the aliphatic dicarboxylic acid unit.
4. The aliphatic polyester polyether copolymer according to claim 1 , wherein the aliphatic oxycarboxylic acid unit comprises units of lactic acid and/or glycolic acid.
5. The aliphatic polyester polyether copolymer according to claim 1 , wherein the aliphatic diol unit comprises units of 1,4-butanediol and/or ethylene glycol.
6. The aliphatic polyester polyether copolymer according to claim 1 , wherein the aliphatic dicarboxylic acid unit comprises units of succinic acid and/or adipic acid.
7. The aliphatic polyester polyether copolymer according to claim 1 , which exhibits a breaking extension in a tensile test of not less than 400% and strength at breaking point of not less than 15 MPa.
8. The aliphatic polyester polyether copolymer according to claim 1 , wherein peak temperature for each of tan δ and loss modulus G″ in a dynamic viscoelasticity test is not higher than −30° C.
9. The aliphatic polyester polyether copolymer according to claim 1 , which exhibits a storage modulus and a loss modulus G″ within a measuring temperature range of −50 to 60° C. in a dynamic viscoelasticity test are from 1×10 5 Pa to 1×10 10 Pa and from 1×10 4 Pa to 1×10 8 Pa, respectively.
10. The aliphatic polyester polyether copolymer according to claim 1 , wherein a consumed oxygen amount in a biodegradability test of an aerobic and closed type is not more than 6-fold of that of polybutylene succinate.
11. A process for producing an aliphatic polyester polyether copolymer, comprising polycondensing an aliphatic diol, an aliphatic dicarboxylic acid or a derivative aliphatic oxycarboxylic acid and poly-1,3-propanediol in the presence of a catalyst,
wherein said aliphatic oxycarboxylic acid is condensed in an amount of 0.1 to 100 part(s) by weight to 100 parts by weight of said aliphatic dicarboxylic acid.
12. The process for producing an aliphatic polyester polyether copolymer according to claim 11 , wherein said catalyst comprises a germanium compound.
13. The process for producing an aliphatic polyester polyether copolymer according to claim 12 , wherein the amount of said germanium compound used is not more than 500 ppm to the theoretical yield of the resulting copolymer.
14. The process for producing an aliphatic polyester polyether copolymer according to claim 12 , wherein germanium oxide is dissolved in an aqueous solution of the aliphatic oxycarboxylic acid and a polycondensation reaction is carried out.
15. An aliphatic polyester composition, which is prepared by a process comprising melting and blending: (A) an aliphatic polyester polyether copolymer according to claim 1 ; (B) an aliphatic polyester having a number average molecular weight of 10,000 to 300,000 comprising an aliphatic diol unit, an aliphatic dicarboxylic acid unit and an aliphatic oxycarboxylic acid unit; and (C) polylactic acid having a number average molecular weight of not less than 30,000.
16. The polyester composition according to claim 15 , wherein the amount of the aliphatic polyester polyether copolymer (A) is 1 to 50 part(s) by weight to 100 parts by weight in total of 1 to 99% by weight of the aliphatic polyester (B) and 99 to 1 part(s) by weight of polylactic acid (C).
17. The polyester composition according to claim 15 , wherein said aliphatic polyester polyether copolymer (A) comprises a monomer unit having at least three hydroxyl groups and/or carboxyl groups in an amount within a range of from 0.001 molar % to 5 molar % to said aliphatic dicarboxylic acid unit.
18. The polyester composition according to claim 15 , wherein said aliphatic polyester polyether copolymer (A) comprises units of lactic acid and/or glycolic acid.
19. The polyester composition according to claim 15 , wherein said aliphatic polyester polyether copolymer (A) comprises units of 1,4-butanediol and/or ethylene glycol.
20. The polyester composition according to claim 15 , wherein said aliphatic polyester polyether copolymer (A) comprises units of succinic acid and/or adipic acid.
21. The aliphatic polyester polyether copolymer according to claim 1 , wherein said poly-1,3-propanediol contains 4 to 1,000 repeating units.
22. The aliphatic polyester polyether copolymer according to claim 1 , wherein said poly-1,3-propanediol contains 10 to 500 repeating units.
23. The aliphatic polyester polyether copolymer according to claim 1 , wherein said poly-1,3-propanediol contains 20 to 50 repeating units.
24. The process for producing an aliphatic polyester polyether copolymer according to claim 11 , wherein said poly-1,3-propanediol contains 4 to 1,000 repeating units.
25. The process for producing an aliphatic polyester polyether copolymer according to claim 11 , wherein said poly-1,3-propanediol contains 10 to 500 repeating units.
26. The process for producing an aliphatic polyester polyether copolymer according to claim 11 , wherein said poly-1,3-propanediol contains 20 to 500 repeating units.
27. The polyester composition according to claim 15 , wherein said poly-1,3-propanediol contains 4 to 1,000 repeating units.
28. The polyester composition according to claim 15 , wherein said poly-1,3-propanediol contains 10 to 500 repeating units.
29. The polyester composition according to claim 15 , wherein said poly-1,3-propanediol contains 20 to 500 repeating units.