Polycarbonate and preparation method thereof

Patent metadata

Field	Value
Publication number	US-12122909-B2
Application number	US-201917261471-A
Country	US
Kind code	B2
Filing date	Aug 9, 2019
Priority date	Aug 10, 2018
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

The present disclosure relates to a polycarbonate and a preparation method thereof, which has a novel structure with an improvement in weather resistance and refractive index, while having excellent mechanical properties.

First claim

What is claimed is:

1. A polycarbonate, comprising a repeating unit represented by Chemical Formula 1:

wherein, in Chemical Formula 1,
X is C 6-60 arylene unsubstituted or substituted with C 1-10 alkyl,
Y is C 1-10 alkylene, and
n is an integer of 2 to 10.

2. The polycarbonate of claim 1 ,
wherein Y is C 1-5 alkylene.

3. The polycarbonate of claim 1 ,
wherein X is one of structures represented by the following structural formulae:

4. The polycarbonate of claim 1 ,
further comprising a repeating unit represented by Chemical Formula 2:

wherein, in Chemical Formula 2,
R 1 to R 4 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, and
Z is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2 , or CO.

5. The polycarbonate of claim 4 ,
wherein R 1 to R 4 are each independently hydrogen, or C 1-4 alkyl.

6. The polycarbonate of claim 4 ,
wherein the repeating unit represented by Chemical Formula 1 is included in an amount of 5 wt % to 50 wt % based on a total weight of the repeating units.

7. The polycarbonate of claim 4 ,
wherein the repeating unit represented by the Chemical Formula 1 is included in an amount of more than 50 wt % and 99 wt % or less based on a total weight of the repeating units.

8. The polycarbonate of claim 1 ,
wherein a refractive index (nD) of the polycarbonate measured in accordance with JIS-K-7142 is 1.58 to 1.70.

9. The polycarbonate of claim 1 ,
wherein a weather resistance index (ΔE) of the polycarbonate is 30 or less, calculated according to Equation 1 by measuring L, a, and b values of a specimen in accordance with ASTM D7869 and measuring L′, a′ and b′ values again after leaving the specimen in 2250 hr weathering condition:
Δ E =√{square root over ((( L′−L ) 2 +( a′−a )+( b′−b ) 2 ))}  [Equation 1].

10. The polycarbonate of claim 1 ,
wherein a melt index of the polycarbonate measured in accordance with ASTM D1238 (300° C., 1.2 kg condition) is 10 g/10 min to 50 g/10 min.

11. A method of preparing the polycarbonate of claim 1 , comprising a step of
polymerizing a composition containing a compound represented by Chemical Formula 3, and a carbonate precursor:

wherein, in Chemical Formula 3,
X is C 6-60 arylene unsubstituted or substituted with C 1-10 alkyl,
Y is C 1-10 alkylene, and
n is an integer of 2 to 10.

12. The method of claim 11 ,
wherein X in Chemical Formula 3 is one of structures represented by the following structural formulae:

13. The method of claim 11 ,
wherein the compound represented by Chemical Formula 3 is one of compounds represented by the following structural formulae:

wherein in the above structural formulae, n is as defined in Chemical Formula 3.

14. The method of claim 11 ,
wherein the composition further contains an aromatic diol compound represented by Chemical Formula 4:

wherein, in Chemical Formula 4,
R 1 to 14 are each independently hydrogen, C 1-10 alkyl, C 1-10 alkoxy, or halogen, and
Z is C 1-10 alkylene unsubstituted or substituted with phenyl, C 3-15 cycloalkylene unsubstituted or substituted with C 1-10 alkyl, O, S, SO, SO 2 , or CO.

15. The method of claim 14 ,
wherein the aromatic diol compound represented by the Chemical Formula 4 is at least one compound selected from the group consisting of bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)sulfoxide, bis(4-hydroxyphenyl)sulfide, bis(4-hydroxyphenyl)ketone, 1,1-bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane (bisphenol A), 2,2-bis(4-hydroxyphenyl)butane, 1,1-bis(4 hydroxyphenyl)cyclohexane (bisphenol Z), 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dichlorophenyl)propane, 2,2-bis(4-hydroxy-3-bromophenyl)propane, 2,2-bis(4-hydroxy-3-chlorophenyl)propane, 2,2-bis(4-hydroxy-3-methylphenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, and 1,1-bis(4-hydroxyphenyl)-1-phenylethane.

16. A molded article comprising the polycarbonate of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Lee Ki Jae
• Yang Young In
• Son Youngwook
• Hong Mooho
• Jeon Byoungkue
• Hwang Young Young

Classifications

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• C08G64/24

  and phenols · CPC title

• C08G64/081 Primary

  containing sulfur · CPC title

• C08L69/00 Primary

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

• C08G64/305

  and alcohols · CPC title