Polyester and molded article
Disclosed is a polyester and molded article. The polyester includes residues of formula (i), formula (ii), and formula (iii): in which R 1 is an arylene group; R 2 is a C 2 -C 6 straight-chain hydrocarbylene group; and * represents a linking bond. The polyester has a number average molecular weight not less than 15,000 and has a degree of dispersion ranged from 2.95 to 5.70.
1. A polyester, comprising residues of formula (i), (ii), and formula (iii):
wherein R 1 is an arylene group;
R 2 is a C 2 -C 6 straight-chain hydrocarbylene group; and
* represents a linking bond,
wherein the polyester has a number average molecular weight not less than 15,000 and has a degree of dispersion ranged from 2.95 to 5.70.
2. The polyester of claim 1 , wherein R 1 is
or a combination thereof.
3. The polyester of claim 1 , wherein R 2 is a C 2 -C 4 straight-chain hydrocarbylene group.
4. The polyester of claim 3 , wherein R 2 is a C 2 straight-chain hydrocarbylene group.
5. The polyester of claim 1 , wherein the number average molecular weight is 15,000 to 25,000.
6. The polyester of claim 5 , wherein the number average molecular weight is 16,000 to 23,000.
7. The polyester of claim 1 , wherein the degree of dispersion is 3.00 to 4.50.
8. The polyester of claim 7 , wherein the degree of dispersion is 3.10 to 4.50.
9. The polyester of claim 8 , wherein the degree of dispersion is 3.13 to 4.50.
10. The polyester of claim 1 , wherein the residue of formula (iii) is 10 mol % to 90 mol % of a sum of the residue of formula (ii) and the residue of formula (iii).
11. The polyester of claim 10 , wherein the residue of formula (iii) is 20 mol % to 80 mol % of a sum of the residue of formula (ii) and the residue of formula (iii).
12. A molded article, comprising the polyester of claim 1 .
13. The molded article of claim 12 , wherein R 1 is
or a combination thereof.
14. The molded article of claim 12 , wherein R 2 is a C 2 -C 4 straight-chain hydrocarbylene group.
15. The molded article of claim 14 , wherein R 2 is a C 2 straight-chain hydrocarbylene group.
16. The molded article of claim 12 , wherein the number average molecular weight is 15,000 to 25,000.
17. The molded article of claim 16 , wherein the number average molecular weight is 16,000 to 23,000.
18. The molded article of claim 12 , wherein the degree of dispersion is 3.00 to 4.50.
19. The molded article of claim 12 , wherein the residue of formula (iii) is 10 mol % to 90 mol % of a sum of the residue of formula (ii) and the residue of formula (iii).
20. The molded article of claim 19 , wherein the residue of formula (iii) is 20 mol % to 80 mol % of a sum of the residue of formula (ii) and the residue of formula (iii).