Polycarbonate resin for film, method for preparing the same and film including the same

Patent metadata

Field	Value
Publication number	US-10233283-B2
Application number	US-201314026361-A
Country	US
Kind code	B2
Filing date	Sep 13, 2013
Priority date	Dec 27, 2012
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

wherein R1, R2, R3, R4, a, b, c, and d are the same as defined in the specification. The polycarbonate resin for film can exhibit excellent scratch resistance, elongation, chemical resistance and heat resistance, and can be used to prepare a film in roll form without any protective film.

First claim

What is claimed is:

1. A polycarbonate resin for films, comprising:
about 20 mol % to about 60 mol % of a repeat unit represented by Formula 1;
about 10 mol % to about 30 mol % of a repeat unit represented by Formula 2; and
about 30 mol % to about 70 mol % of a repeat unit represented by Formula 3,
wherein the polycarbonate resin has a weight average molecular weight of about 15,000 g/mol to about 60,000 g/mol and a melt index of about 3 g/10 min to about 40 g/10 min,

wherein R 1 and R 2 are the same or different and are each independently substituted or unsubstituted C1 to C6 alkyl, and a and b are the same or different and are each independently an integer ranging from 0 to 4,

wherein R 3 and R 4 are the same or different and are each independently substituted or unsubstituted C1 to C6 alkyl, and c and d are the same or different and are each independently an integer ranging from 1 to 4.

2. The polycarbonate resin for films according to claim 1 , wherein the polycarbonate resin has a pencil hardness of F or higher as measured under a load of 500 g in accordance with ASTM D3362, and a scratch width of less than about 310 μm as measured by a Ball-type Scratch Profile (BSP) test.

3. The polycarbonate resin for films according to claim 1 , wherein the polycarbonate resin has an elongation of about 30% to about 100% as measured at 25° C. in accordance with ASTM D638.

4. The polycarbonate resin for films according to claim 1 , wherein the polycarbonate resin has a transmittance of visible light of about 70% or more as measured by immersing and drying a 3.2 mm thick flat panel specimen in diluents for priming of polycarbonate resins for 2 minutes, and a haze of about 5% or less.

5. A film comprising the polycarbonate resin for films according to claim 1 and having a thickness from about 30 μm to about 2,000 μm.

6. The film according to claim 5 , wherein the film has a thickness from about 30 μm to about 200 μm, an elongation of about 30% to about 100% as measured at 25° C. in accordance with ASTM D638, and a transmittance of visible light of about 70% or more as measured by immersing and drying a 3.2 mm thick flat panel specimen in diluents for priming of polycarbonate resins for 2 minutes.

7. The film according to claim 5 , wherein the film has a thickness from about 30 μm to about 200 μm.

8. The film according to claim 5 , wherein the film has a pencil hardness of F or higher as measured under a load of 500 g in accordance with ASTM D3362, and a scratch width of less than about 310 μm as measured by Ball-type Scratch Profile (BSP) test.

9. The film according to claim 5 , wherein the film exhibits no cracking on an outer appearance thereof when the film is wound into a roll having a diameter of about 10 mm.

10. The polycarbonate resin for films according to claim 1 , wherein the repeat unit represented by Formula 3 comprises 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-diethyl-4-hydroxyphenyl)-propane, 2-bis-(3,5-diisopropyl-4-hydroxyphenyl)-propane, 2,2-bis-(3,5-dibutyl-4-hydroxyphenyl)-propane, and/or a combinations thereof.

11. The polycarbonate resin for films according to claim 1 , wherein the repeat unit represented by Formula 3 comprises 2,2-bis-(3,5-dimethyl-4-hydroxyphenyl)-propane.

12. The polycarbonate resin for films according to claim 11 , wherein a film made of the polycarbonate resin has a scratch width of 240 to 275 μm as measured by a Ball-type Scratch Profile (BSP) test and an elongation of 65% to 85% as measured at 25 20 C. in accordance with ASTM D638.

13. The polycarbonate resin for films according to claim 1 , wherein the polycarbonate resin has a weight average molecular weight of about 25,000 g/mol to about 50,000 g/mol and a melt index of about 6 g/10 min to about 30 g/10 min.

14. The polycarbonate resin for films according to claim 13 , wherein the polycarbonate resin has a weight average molecular weight of 38,500 g/mol to about 50,000 g/mol and a melt index of about 6 g/10 min to 13.5 g/10 min.

Assignees

• Lotte Advanced Mat Co Ltd

Inventors

• Chi Jun Ho
• Kwon O Sung
• Hur Jong Chan
• Kwon Hyuck Man
• Lee Dong Geun
• Chei Woo Suk
• Jang Bok Nam

Classifications

• B29C47/92

  Operations & Transport · mapped topic

• B29C2947/92152

  Operations & Transport · mapped topic

• C08G64/307

  and phenols · CPC title

• B29C47/0021

  Operations & Transport · mapped topic

• B29C2947/92209

  Operations & Transport · mapped topic