Polylactic acid, resin composition, and resin molded product
View Patent ↗A polylactic acid has a terminal-modified structure represented by the following formula (1): wherein in the formula (1), R represents a residue of an organic phosphorus compound containing an epoxy group, and n represents an integer from 100 to 5000.
1. A polylactic acid having a terminal-modified structure represented by the following formula (1):
where in the formula (1),
R represents a residue of an organic phosphorus compound containing an epoxy group, and
n represents an integer from 100 to 5000;
wherein the polylactic acid having a terminal-modified structure is a reaction product of a terminal-unmodified polylactic acid and the organic phosphorus compound, an amount of the organic phosphorus compound being 0.2 to 5 parts by weight with respect to the terminal-unmodified polylactic acid.
2. The polylactic acid having a terminal-modified structure according to claim 1 , wherein the organic phosphorus compound is selected from a phosphonate compound, a phosphinate compound, a phosphine oxide compound, and a phosphite compound.
3. The polylactic acid having a terminal-modified structure according to claim 1 , wherein a terminal modification rate of the polylactic acid is 50% or more.
4. The polylactic acid having a terminal-modified structure according to claim 1 , wherein a terminal modification rate of the polylactic acid is 80% or more.
5. The polylactic acid having a terminal-modified structure according to claim 1 , wherein n is from 500 to 3000.
6. The polylactic acid having a terminal-modified structure according to claim 1 , wherein the organic phosphorus compound has an aromatic ring structure.
7. The polylactic acid having a terminal-modified structure according to claim 2 , wherein the organic phosphorus compound is selected from the following formulae:
8. A resin composition having the polylactic acid having a terminal-modified structure of claim 1 .
9. The resin composition according to claim 8 , wherein the organic phosphorus compound is selected from a phosphonate compound, a phosphinate compound, a phosphine oxide compound, and a phosphite compound.
10. The resin composition according to claim 8 , wherein a terminal modification rate of the polylactic acid having a terminal-modified structure is 50% or more.
11. The resin composition according to claim 8 , wherein the organic phosphorus compound has an aromatic ring structure.
12. A resin molded product having the polylactic acid having a terminal-modified structure of claim 1 .
13. The resin molded product according to claim 12 , wherein the organic phosphorus compound is selected from a phosphonate compound, a phosphinate compound, a phosphine oxide compound, and a phosphite compound.
14. The resin molded product according to claim 12 , wherein a terminal modification rate of the polylactic acid having a terminal-modified structure is 50% or more.
15. The resin molded product according to claim 12 , wherein the organic phosphorus compound has an aromatic ring structure.
16. A resin composition comprising a polylactic acid having a terminal-modified structure, and an organic phosphorus compound containing an epoxy group, wherein the polylactic acid having a terminal-modified structure is a reaction product of a terminal-unmodified polylactic acid and the organic phosphorus compound, an amount of the organic phosphorus compound being 0.2 to 5 parts by weight with respect to the terminal-unmodified polylactic acid.