RESIN COMPOSITION, MOLDED ARTICLE, AND PRODUCTION METHODS THEREOF

• US 20100227963A1
• Filed: 01/17/2007
• Published: 09/09/2010
• Est. Priority Date: 01/18/2006
• Status: Abandoned Application

• Current Assignee: Teijin Chemicals Ltd. (Teijin Limited), Teijin Limited
• Original Assignee: Teijin Chemicals Ltd. (Teijin Limited), Teijin Limited
• Inventors: Suzuki, Hirotaka, Toyohara, Kiyotsuna, Matsuno, Yuichi, Kondo, Fumitaka, Ino, Keiichiro, Hironaka, Katsuhiko
• Application Number:
  US12/161,295
• Publication Number:
  US 20100227963A1
• Time in Patent Office: Days
• US Class Current: 524/451
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08K 5/51 Phosphorus bound to oxygen
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 25/04 Homopolymers or copolymers of styrene
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: C08L 69/00 Compositions of polycarbonates; Compositions of derivatives of polycarbonates

Abstract

There are provided a resin composition comprising a polylactic acid which (i) comprises a poly-L-lactic acid (component B-1) and a poly-D-lactic acid (component B-4), (ii) has a weight ratio of the component B-1 to the component B-4 (component B-1/component B-4) of 10/90 to 90/10, and (iii) shows a proportion of melt peaks at 195° C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%; a molded article of the resin composition; and methods for producing the resin composition and the molded article.

Claims

1. A resin composition comprising 100 parts by weight of thermoplastic resin (component A) and 1 to 200 parts by weight of polylactic acid (component B), wherein

(i) the component B comprises a polylactic acid (component B-1) that comprises 90 to 100 mol % of L-lactic acid unit and 0 to 10 mol % of D-lactic acid unit and/or units other than lactic acid and a polylactic acid (component B-4) that comprises 90 to 100 mol % of D-lactic acid unit and 0 to 10 mol % of L-lactic acid unit and/or units other than lactic acid,

(ii) the weight ratio of the component B-1 to component B-4 (component B-1/component B-4) in the component B is within a range of 10/90 to 90/10, and

(iii) the component B in the resin composition shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%.

2. The composition of claim 1, wherein the component A is at least one resin selected from the group consisting of an aromatic polycarbonate resin, a polyester resin, a polyolefin resin and a styrene resin.

3. The composition of claim 1, wherein the component A is an aromatic polycarbonate resin.

4. The composition of claim 3, wherein the aromatic polycarbonate resin is bisphenol A based polycarbonate resin.

5. The composition of claim 1, wherein the component B in the resin composition shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 70%.

6. The composition of claim 1, comprising 0.01 to 5 parts by weight of crystal nucleating agent (component C) based on 100 parts by weight of the component B.

7. The composition of claim 6, wherein the crystal nucleating agent (component C) is talc.

8. The composition of claim 1, comprising 0.3 to 200 parts by weight of inorganic filler (component D) based on 100 parts by weight of the component A.

9. The composition of claim 1, comprising 0.01 to 5 parts by weight of terminal blocking agent (component E) based on 100 parts by weight of the component B.

17. A molded article comprising the composition of claim 1.

18. The molded article of claim 17, which is an injection-molded article.

19. The molded article of claim 17, which is an automobile part, an electric/electronic part, an electrical equipment exterior part, an office automation equipment exterior part or an optical disk substrate.

10. A method for producing a resin composition by melt-kneading 100 parts by weight of thermoplastic resin (component A) and 1 to 200 parts by weight of polylactic acid (component B), wherein

(i) the component B comprises a polylactic acid (component B-1) that comprises 90 to 100 mol % of L-lactic acid unit and 0 to 10 mol % of D-lactic acid unit and/or units other than lactic acid and a polylactic acid (component B-4) that comprises 90 to 100 mol % of D-lactic acid unit and 0 to 10 mol % of L-lactic acid unit and/or units other than lactic acid,

(ii) the weight ratio of the component B-1 to component B-4 (component B-1/component B-4) in the component B is within a range of 10/90 to 90/10, and

(iii) the component B shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%.

11. The method of claim 10, wherein the component B shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 70%.

12. The method of claim 10, wherein the component B is obtained by melt-kneading the component B-1 and the component B-4 at 245 to 300°

C.

13. The method of claim 10, wherein melt-kneading is carried out in the presence of 0.01 to 5 parts by weight of crystal nucleating agent (component C) based on 100 parts by weight of the component B.

14. The method of claim 13, wherein the component C is talc.

15. The method of claim 10, wherein melt-kneading is carried out in the presence of 0.3 to 200 parts by weight of inorganic filler (component D) based on 100 parts by weight of the component A.

16. The method of claim 10, wherein melt-kneading is carried out in the presence of 0.01 to 5 parts by weight of terminal blocking agent (component E) based on 100 parts by weight of the component B.

20. A molded article comprising a polylactic acid (component B) that shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%.

21. The molded article of claim 20, comprising a polylactic acid (component B) that shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 70%.

22. The molded article of claim 20, wherein the component B comprises a polylactic acid (component B-1) that comprises 90 to 100 mol % of L-lactic acid unit and 0 to 10 mol % of D-lactic acid unit and/or units other than lactic acid and a polylactic acid (component B-4) that comprises 90 to 100 mol % of D-lactic acid unit and 0 to 10 mol % of L-lactic acid unit and/or units other than lactic acid, and the weight ratio of the component B-1 to the component B-4 (component B-1/component B-4) is within a range of 10/90 to 90/10.

23. The molded article of claim 20, comprising 0.01 to 5 parts by weight of crystal nucleating agent (component C) based on 100 parts by weight of the component B.

24. The molded article of claim 23, wherein the component C is talc.

25. The molded article of claim 20, which is in a block shape.

26. The molded article of claim 20, comprising 0.3 to 200 parts by weight of inorganic filler (component D) based on 100 parts by weight of the component B.

27. The molded article of claim 20, comprising 0.01 to 5 parts by weight of terminal blocking agent (component E) based on 100 parts by weight of the component B.

28. The molded article of claim 20, which is an automobile part, an electric/electronic part, an electrical equipment exterior part, an office automation equipment exterior part or an optical disk substrate.

29. A method for producing a molded article by molding pellets comprising a polylactic acid (component B) that shows a proportion of melt peaks at 195°

C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 70%.

30. The method of claim 29, wherein the component B comprises a polylactic acid (component B-1) that comprises 90 to 100 mol % of L-lactic acid unit and 0 to 10 mol % of D-lactic acid unit and/or units other than lactic acid and a polylactic acid (component B-4) that comprises 90 to 100 mol % of D-lactic acid unit and 0 to 10 mol % of L-lactic acid unit and/or units other than lactic acid, and the weight ratio of the component B-1 to the component B-4 (component B-1/component B-4) is within a range of 10/90 to 90/10.

31. The method of claim 29, wherein the component B is a polylactic acid obtained by kneading the component B-1 and the component B-4 at 245 to 300°

C.

32. The method of claim 29, wherein the pellets comprise 0.01 to 5 parts by weight of crystal nucleating agent (component C) based on 100 parts by weight of the component B.

33. The method of claim 32, wherein the component C is talc.

34. The method of claim 29, wherein the pellets comprise 0.3 to 200 parts by weight of inorganic filler (component D) based on 100 parts by weight of the component B.

35. The method of claim 29, wherein the pellets comprise 0.01 to 5 parts by weight of terminal blocking agent (component E) based on 100 parts by weight of the component B.

36. The method of claim 29, wherein molding is carried out by injection molding, extrusion, heat molding, blow molding or foam molding.

37. The method of claim 36, wherein injection molding is carried out at a mold temperature of 80 to 130°

C.

38. The method of claim 36, wherein a resin obtained by melting the pellets at 200°

C. or higher is extruded.

39. The method of claim 38, wherein an obtained molded article is heat-treated within a temperature range of its crystallization temperature to melting point.

40. The method of claim 36, wherein after a resin obtained by melting the pellets at 200°

C. or higher is extruded through a slit die to obtain a sheet-shaped extruded article, the extruded article is first heated to its glass transition temperature or higher and then heat-molded.

41. The method of claim 40, wherein an obtained molded article is heat-treated within a temperature range of its crystallization temperature to melting point.

42. The method of claim 36, wherein after a resin obtained by melting the pellets at 200°

C. or higher is molded to form a parison, the parison is first heated to its glass transition temperature or higher and then blow-molded.

43. The method of claim 42, wherein an obtained molded article is heat-treated within a temperature range of its crystallization temperature to melting point.

44. The method of claim 36, wherein a resin obtained by melting the pellets at 160°

C. or higher is foam-molded.

45. The method of claim 44, wherein an obtained molded article is heat-treated within a temperature range of its crystallization temperature to melting point.