Polycarbonate composition and optical product formed therefrom

Patent metadata

Field	Value
Publication number	US-11773259-B2
Application number	US-202017432196-A
Country	US
Kind code	B2
Filing date	Nov 25, 2020
Priority date	Dec 4, 2019
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

Provided is a polycarbonate composition comprising a polycarbonate and a light blocking agent, and an optical product formed therefrom. The polycarbonate composition has a low yellow index, unlike conventional yellowish blue light-blocking products, and thus various colors can be implemented. Accordingly, it is possible to provide optical products with various colors, and the polycarbonate composition is very suitable for spectacles required to have high transparency and to block blue light that is harmful to eyes.

First claim

The invention claimed is:

1. A polycarbonate composition, comprising:
a polycarbonate; and
a light blocking agent,
wherein 5YT420 calculated by the following Equation 1 is 2.5 to 71:
5 YT 420=(5* Y )+ T 420  <Equation 1>

wherein in Equation 1:
Y is a yellow index measured according to ASTM D1925 for a specimen having a thickness of 3 mm formed from the polycarbonate composition, and
T420 is a transmittance at 420 nm measured according to ASTM D1003; and
wherein YT410 calculated by the following Equation 2 is 2 to 13:
YT 410= Y+T 410  <Equation 2>

wherein in Equation 2:
Y is a yellow index measured according to ASTM D1925 for a specimen having a thickness of 3 mm formed from the polycarbonate composition, and
T410 is a transmittance at 410 nm measured according to ASTM D1003.

2. The polycarbonate composition of claim 1 ,
wherein the 5YT420 calculated by the Equation 1 is 60 to 66.

3. The polycarbonate composition of claim 1 ,
wherein the transmittance at 420 nm measured according to ASTM D1003 for a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0.1 to 47%.

4. The polycarbonate composition of claim 1 ,
wherein the transmittance at 410 nm measured according to ASTM D1003 for a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0.01 to 6.0%.

5. The polycarbonate composition of claim 1 ,
wherein the yellow index measured according to ASTM D1925 for a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0.1 to 11.5.

6. The polycarbonate composition of claim 1 ,
wherein an impact strength measured according to ASTM D256 for a specimen having a thickness of 6.35 mm formed from the polycarbonate composition is 680 to 800 J/m.

7. The polycarbonate composition of claim 1 ,
wherein an amount of total volatile organic compounds released for 15 minutes at 280° C. in a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0 to 210 ppm.

8. A polycarbonate composition, comprising:
a polycarbonate; and
a light blocking agent,
wherein 5YT420 calculated by the following Equation 1 is 2.5 to 71:
5 YT 420=(5* Y )+ T 420  <Equation 1>

wherein in Equation 1:
Y is a yellow index measured according to ASTM D1925 for a specimen having a thickness of 3 mm formed from the polycarbonate composition, and
T420 is a transmittance at 420 nm measured according to ASTM D1003,
wherein the light blocking agent comprises a compound of Chemical Formula 1:

wherein in Chemical Formula 1:
R 1 is hydrogen, halogen, a hydroxyl group or a cyano group; and
R 2 to R 6 are each independently hydrogen, halogen, a hydroxyl group, a cyano group, or a C1 to C5 alkoxy group, provided that at least one of R 2 to R 6 is halogen, a hydroxyl group, a cyano group, or a C1 to C5 alkoxy group.

9. The polycarbonate composition of claim 8 , wherein the R 1 is hydrogen.

10. The polycarbonate composition of claim 8 ,
wherein at least one of R 2 to R 6 is a C1 to C5 alkoxy group, and the rest are hydrogen, halogen, a hydroxyl group, a cyano group, or a C1 to C5 alkoxy group.

11. The polycarbonate composition of claim 8 ,
wherein 2 to 4 of R 2 to R 6 are C1 to C5 alkoxy groups, and the rest are hydrogen.

12. The polycarbonate composition of claim 1 ,
wherein the light blocking agent is included in an amount of 0.001 to 0.500 wt % based on a total weight of the polycarbonate and the light blocking agent.

13. The polycarbonate composition of claim 1 ,
wherein the polycarbonate comprises a repeating unit of Chemical Formula 2:

wherein in Chemical Formula 2:
R 7 to R 10 are each independently hydrogen, a C1 to C10 alkyl group, a C1 to C10 alkoxy group, or halogen; and
Z is a C1 to C10 alkylene group that is unsubstituted or substituted with phenyl, a C3 to C15 cycloalkylene group that is unsubstituted or substituted with a C1 to C10 alkyl group, O, S, SO, SO 2 , or CO.

14. An optical product comprising the polycarbonate composition of claim 1 .

15. The optical product of claim 14 , wherein the optical product is a spectacle lens.

16. The polycarbonate composition of claim 8 , wherein:
the transmittance at 420 nm measured according to ASTM D1003 for a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0.1 to 47%; and
the transmittance at 410 nm measured according to ASTM D1003 for a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0.01 to 6.0%.

17. The polycarbonate composition of claim 8 ,
wherein the yellow index measured according to ASTM D1925 for a specimen having a thickness of 3 mm formed from the polycarbonate composition is 0.1 to 11.5.

18. The polycarbonate composition of claim 8 ,
wherein an impact strength measured according to ASTM D256 for a specimen having a thickness of 6.35 mm formed from the polycarbonate composition is 680 to 800 J/m.

19. An optical product comprising the polycarbonate composition of claim 8 .

20. The optical product of claim 19 , wherein the optical product is a spectacle lens.

Assignees

• Lg Chemical Ltd

Inventors

• Yang Young In
• Jeon Byoungkue
• Hong Mooho
• Cho Seongmi
• Lee Hoyong
• Jung Jihye

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08K5/315 Primary

  Compounds containing carbon-to-nitrogen triple bonds · CPC title

• G02B1/041 Primary

  Lenses · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08K5/005

  Stabilisers against oxidation, heat, light, ozone · CPC title