RESIN COMPOSITION AND USE THEREOF

• US 20120277355A1
• Filed: 06/14/2012
• Published: 11/01/2012
• Est. Priority Date: 07/09/2004
• Status: Abandoned Application

• Current Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Original Assignee: Mitsui Chemicals Incorporated (Mitsui Chemicals)
• Inventors: Hirose, Toshiyuki, SHIBUYA, Atsushi
• Application Number:
  US13/523,322
• Publication Number:
  US 20120277355A1
• Time in Patent Office: Days
• US Class Current: 524/102
• CPC Class Codes: C08K 5/0008 Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• CPC Class Codes: C08K 5/3435 Piperidines
• CPC Class Codes: C08K 5/49 Phosphorus-containing compounds C08K5/0091 takes precedence
• CPC Class Codes: C08L 23/0823 Copolymers of ethene with aliphatic cyclic olefins
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G11B 2007/0006 adapted for scanning different types of carrier, e.g. CD & DVD

Abstract

A resin composition suitable for an optical element in which the moldability, thermal resistance, mechanical strength, and low birefringence are not impaired, the deterioration is hardly generated although the laser light nearby the UV is used, change in the optical properties during the use are extremely small, particularly the light transmittance is maintained high, and a foreign substance is hardly deposited on a surface of the molded product such as an optical element. In addition, an optical element obtained by molding the resin composition, and an optical pickup device using the optical element. The thermoplastic resin composition contains the polymer having a specific structure and two kinds of specific optical stabilizers in a specific mass ratio among a hindered amine light stabilizer having the molecular weight of 400 to 5,000.

Claims

1. An optical element which is obtained by molding a thermoplastic resin composition comprising Polymer [A-1] represented by Formula (1), Compound [B-1], and Compound [B-2], wherein the total amount of Compound [B-1] and Compound [B-2] included is from 0.3 to 5 parts by mass relative to 100 parts by mass of Polymer [A-1], and the mass ratio [B-1]/[B-2] is from 1/10 to 10/1:

2. The optical element as claimed in claim 1, wherein Compound [B-1] has a structure represented by Formula (2):

3. The optical element as claimed in claim 1, wherein the thermoplastic resin composition is further comprised of 0.01 to 1 parts by mass of a phosphorous stabilizer, relative to 100 parts by mass of Polymer [A-1] or Polymer [A-2].

4. The optical element as claimed in claim 1, wherein the thermoplastic resin composition is further comprised of 0.05 to 5 parts by mass of a hydrophilic stabilizer, relative to 100 parts by mass of Polymer [A-1] or Polymer [A-2].

5. The optical element as claimed in claim 1, further comprising an optical path difference providing structure.

6. The optical element as claimed in claim 1, wherein the optical element is used for an optical pickup device.

7. The optical element as claimed in claim 6, wherein the optical element is used for an optical pickup device which employs a plurality of light sources of different wavelength and is capable of recording or playing back information on an optical information recording medium of various kinds having a different substrate thickness.

8. The optical element as claimed in claim 6, wherein the optical element is used for an optical pickup device having the light sources which at least one of the wavelength is from 390 nm to 420 nm.

9. The optical element as claimed in claim 1, wherein at least one part of the optical element is held by an actuator to be movable.

16. An optical pickup device employing the optical element of claim 6.

10. An optical element which is obtained by molding a thermoplastic resin composition comprising Polymer [A-1] represented by Formula (1), Compound [B-1], and Compound [B-2], wherein the total amount of Compound [B-1] and Compound [B-2] included is from 0.3 to 5 parts by mass relative to 100 parts by mass of Polymer [A-1], and the mass ratio [B-1]/[B-2] is from 1/10 to 10/1:

11. The optical element as claimed in claim 10, further comprising an optical path difference providing structure.

12. The optical element as claimed in claim 10, wherein the optical element is used for an optical pickup device.

13. The optical element as claimed in claim 12, wherein the optical element is used for an optical pickup device which employs a plurality of light sources of different wavelength and is capable of recording or playing back information on an optical information recording medium of various kinds having a different substrate thickness.

14. The optical element as claimed in claim 12, wherein the optical element is used for an optical pickup device having the light sources which at least one of the wavelength is from 390 nm to 420 nm.

15. The optical element as claimed in claim 10, wherein at least one part of the optical element is held by an actuator to be movable.

17. An optical pickup device employing the optical element of claim 12.

18. An optical element which is obtained by molding a thermoplastic resin composition comprising Polymer [A-2] which has an alicyclic structure on at least one moiety of repeated structural units, Compound [B-1], and Compound [B-2], wherein the total amount of Compound [B-1] and Compound [B-2] included is from 0.3 to 5 parts by mass relative to 100 parts by mass of Polymer [A-2], and the mass ratio [B-1]/[B-2] is from 1/10 to 10/1,

wherein, Compound [B-1] is a hindered amine light stabilizer having the molecular weight of 400 or more to less than 1,000, and Compound [B-2] is a hindered amine light stabilizer having the molecular weight of 1,000 or more to 5,000 or less.

19. The optical element as claimed in claim 18, wherein Compound [B-1] has a structure represented by Formula (2):

20. The optical element as claimed in claim 18, wherein the thermoplastic resin composition is further comprised of 0.01 to 1 parts by mass of a phosphorous stabilizer, relative to 100 parts by mass of Polymer [A-1] or Polymer [A-2].

21. The optical element as claimed in claim 18, wherein the thermoplastic resin composition is further comprised of 0.05 to 5 parts by mass of a hydrophilic stabilizer, relative to 100 parts by mass of Polymer [A-1] or Polymer [A-2].

22. The optical element as claimed in claim 18, further comprising an optical path difference providing structure.

23. The optical element as claimed in claim 18, wherein the optical element is used for an optical pickup device.

24. The optical element as claimed in claim 23, wherein the optical element is used for an optical pickup device which employs a plurality of light sources of different wavelength and is capable of recording or playing back information on an optical information recording medium of various kinds having a different substrate thickness.

25. The optical element as claimed in claim 23, wherein the optical element is used for an optical pickup device having the light sources which at least one of the wavelength is from 390 nm to 420 nm.

26. The optical element as claimed in claim 18, wherein at least one part of the optical element is held by an actuator to be movable.

33. An optical pickup device employing the optical element of claim 23.

27. An optical element which is obtained by molding a thermoplastic resin composition comprising Polymer [A-2] which has an alicyclic structure on at least one moiety of repeated structural units, Compound [B-1], and Compound [B-2], wherein the total amount of Compound [B-1] and Compound [B-2] included is from 0.3 to 5 parts by mass relative to 100 parts by mass of Polymer [A-2], and the mass ratio [B-1]/[B-2] is from 1/10 to 10/1,

wherein, Compound [B-1] is a hindered amine light stabilizer having the molecular weight of 400 or more to less than 1,000, and Compound [B-2] is a hindered amine light stabilizer having the molecular weight of 1,000 or more to 5,000 or less, and

wherein the optical element is used as an optical component useful for a laser optical system having the wavelength of 350 to 450 nm.

28. The optical element as claimed in claim 27, further comprising an optical path difference providing structure.

29. The optical element as claimed in claim 27, wherein the optical element is used for an optical pickup device.

30. The optical element as claimed in claim 29, wherein the optical element is used for an optical pickup device which employs a plurality of light sources of different wavelength and is capable of recording or playing back information on an optical information recording medium of various kinds having a different substrate thickness.

31. The optical element as claimed in claim 29, wherein the optical element is used for an optical pickup device having the light sources which at least one of the wavelength is from 390 nm to 420 nm.

32. The optical element as claimed in claim 27, wherein at least one part of the optical element is held by an actuator to be movable.

34. An optical pickup device employing the optical element of claim 29.