Polylactic acid resin composition and polylactic acid resin molded body

Patent metadata

Field	Value
Publication number	US-9550876-B2
Application number	US-200913003263-A
Country	US
Kind code	B2
Filing date	Apr 16, 2009
Priority date	Jul 10, 2008
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

Disclosed is a polylactic acid resin composition having excellent bleed resistance and molecular weight retention ratio. A polylactic acid resin molded body is also disclosed. The polylactic acid resin composition contains a polylactic acid resin (a), a metal hydrate (b) having an alkali metal-containing substance content of not more than 0.2% by mass, and a phosphazene derivative (c). The polylactic acid resin molded body is obtained by molding the polylactic acid resin composition. Specifically, a polylactic acid molded body can be produced by filling a melt of the polylactic acid resin composition into a mold at a temperature in the range from glass transition temperature of said polylactic acid resin (a) to 110° C. and molding the melt therein.

First claim

The invention claimed is:

1. A polylactic acid resin composition containing a polylactic acid resin (a), a metal hydrate (b) having an alkali metal-containing substance content of not more than 0.2% by mass, and a phosphazene derivative (c),
wherein said metal hydrate (b) is aluminum hydrate,
wherein said phosphazene derivative (c) primarily comprises a cyclophosophazene compound having a phenoxy group,
wherein said polylactic acid resin (a) comprises a copolymer of L-lactic acid and D-lactic acid, and wherein a weight-average molecular weight of said polylactic acid resin (a) is more than 100,000, and
wherein a mass ratio of said polylactic acid resin (a) to said metal hydrate(b), expressed as (a)/(b), is 52.5/44.5 to 53/44.5, and a mass ratio of said polylactic acid resin (a) to said phosphazene derivative (c), expressed as (a)/(c), is 53/2 to 52.5/2.5.

2. The polylactic acid resin composition according to claim 1 , wherein a content of said phosphazene derivative (c) is 3.7-4.8 parts by mass with respect to 100 parts by mass of said polylactic acid resin (a).

3. The polylactic acid resin composition according to claim 1 , wherein a weight-average molecular weight of said polylactic acid resin (a) is from 140,000 to 210,000.

4. The polylactic acid resin composition according to claim 1 , further comprising an agent for inhibiting hydrolysis in a content of 0.05-7 parts by mass with respect to 100 parts by mass of the polylactic acid resin (a).

5. The polylactic acid resin composition according to claim 4 , wherein the agent for inhibiting hydrolysis is selected from the group consisting of a polycarbodiimide compound and a monocarbodiimide compound.

6. The polylactic acid resin composition according to claim 1 , further comprising an antidrip agent.

7. The polylactic acid resin composition according to claim 6 , wherein the antidrip agent comprises polytetrafluoroethylene.

8. The polylactic acid resin composition according to claim 1 , further comprising an inorganic filler in a content of 3-50 parts by mass with respect to 100 parts by mass of the polylactic acid resin (a).

9. The polylactic acid resin composition according to claim 8 , wherein the inorganic filler comprises silica.

10. The polylactic acid resin composition according to claim 8 , wherein the inorganic filler comprises glass fiber.

11. A polylactic acid resin molded body formed by molding the polylactic acid resin composition of claim 1 .

12. A method for manufacturing a polylactic acid resin molded body comprising:
(1) a process of dissolving and kneading a polylactic acid resin (a), a metal hydrate (b) having an alkali metal-containing substance content of not more than 0.2% by mass and a phosphazene derivative (c), wherein a mass ratio of said polylactic acid resin (a) to said metal hydrate (b), expressed as (a)/(b), is 52.5/44.5 to 53/44.5, and a mass ratio of said polylactic acid resin (a) to said phosphazene derivative (c), expressed as (a)/(c), is 53/2 to 52.5/2.5, wherein said polylactic acid resin (a) comprises a copolymer of L-lactic acid and D-lactic acid, and wherein a weight-average molecular weight of said polylactic acid resin (a) is more than 100,000, and wherein said metal hydrate (b) is aluminum hydrate, to obtain a melt of a polylactic acid resin composition, and
(2) a process of filling said melt in a mold at temperature in the range from glass transition temperature of said polylactic acid resin (a) to 110° C. and molding it.

13. A polylactic acid resin composition containing a polylactic acid resin (a), a metal hydrate (b) having an alkali metal-containing substance content of not more than 0.2% by mass, and a phosphazene derivative (c),
wherein said metal hydrate (b) is aluminum hydrate,
wherein said phosphazene derivative (c) primarily comprises a cyclophosphazene compound having phenoxy group,
wherein a weight-average molecular weight of said polylactic resin (a) is more than 100,000, and
wherein a mass ratio of said polylactic acid resin (a) to said metal hydrate (b), expressed as (a)/(b), is 52.5/44.5 to 53/44.5, and a mass ratio of said polylactic acid resin (a) to said phosphazene derivative (c), expressed as (a)/(c), is 53/2 to 52.5/2.5.

14. A method for manufacturing a polylactic acid resin molded body comprising:
(1) a process of dissolving and kneading a polylactic acid resin (a), a metal hydrate (b) having an alkali metal-containing substance content of not more than 0.2% by mass and a phosphazene derivative (c), wherein a mass ratio of said polylactic acid resin (a) to said metal hydrate (b), expressed as (a)/(b), is 52.5/44.5 to 53/44.5, and a mass ratio of said polylactic acid resin (a) to said phosphazene derivative (c), expressed as (a)/(c) is 53/2 to 52.5/2.5, wherein a weight-average molecular weight of said polylactic acid resin (a) is more than 100,000, and wherein said metal hydrate (b) is aluminum hydrate, to obtain a melt of a polylactic acid resin composition, and (2) a process of filling said melt in a mold at temperature in the range from glass transition temperature of said polylactic acid resin (a) to 110° C. and molding it.

Assignees

• Kiuchi Yukihiro
• Yanagisawa Tsunenori
• Iji Masatoshi
• Inoue Kazuhiko
• Serizawa Shin
• Nec Corp

Inventors

• Kiuchi Yukihiro
• Yanagisawa Tsunenori
• Iji Masatoshi
• Inoue Kazuhiko
• Serizawa Shin

Classifications

• C08K3/22 Primary

  of metals · CPC title

• C08K5/5399

  Phosphorus bound to nitrogen · CPC title

• C08K13/02

  Organic and inorganic ingredients · CPC title

• C08L67/04 Primary

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence) · CPC title

• C08J5/00

  Manufacture of articles or shaped materials containing macromolecular substances (manufacture of semi-permeable membranes B01D67/00 - B01D71/00) · CPC title