Polyamide resin film and resin laminate using the same

Patent metadata

Field	Value
Publication number	US-12031028-B2
Application number	US-201917256055-A
Country	US
Kind code	B2
Filing date	Dec 26, 2019
Priority date	Feb 1, 2019
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

The present invention relates to a polyamide resin film having improved UV shielding function by using a polyamide resin having a backbone chain of alternative structure of two types of polyamide segments; and a resin laminate using the polyamide resin film.

First claim

The invention claimed is:

1. A polyamide resin film comprising: a polyamide resin containing a backbone chain formed by alternative bonding of a first polyamide segment containing a first aromatic amide repeating unit, and a second polyamide segment containing a second aromatic amide repeating unit having a structure different from the first aromatic amide repeating unit,
wherein a transmittance of ultraviolet light with a wavelength of 388 nm for a film specimen having a thickness of 45 μm or more and 55 μm or less is 15% or less, and
wherein a UV-cut slope (dT/dλ) for the film specimen having a thickness of 45 μm or more and 55 μm or less as measured according to ASTM E424 is at least 0.25 in the range of 10% to 80% transmittance,
wherein the backbone chain includes an alternating repeating unit represented by Chemical Formula 3,

in the Chemical Formula 3,
A is the first polyamide segment, and
B is the second polyamide segment, and
wherein a haze value measured according to ASTM D1003 for a film specimen having a thickness of 45 μm or more and 55 μm or less is 1.5% or less.

2. The polyamide resin film of claim 1 , wherein
the first aromatic amide repeating unit is a repeating unit represented by Chemical Formula 1:

in the Chemical Formula 1,
Ar 1 is a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 20 carbon atoms.

3. The polyamide resin film of claim 1 , wherein
the second aromatic amide repeating unit is a repeating unit represented by Chemical Formula 2:

in the Chemical Formula 2,
Ar 2 is a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 20 carbon atoms.

4. The polyamide resin film of claim 1 , wherein
the first polyamide segment includes a block of the first aromatic amide repeating units, and the second polyamide segment includes a block of the second aromatic amide repeating units.

5. The polyamide resin film of claim 1 , wherein
the polyamide resin has a weight average molecular weight of at least 330000 g/mol.

6. The polyamide resin film of claim 1 , wherein
the polyamide resin has a relative viscosity of at least 45,000 cps as measured according to ASTM D 2196.

7. The polyamide resin film of claim 1 , wherein
based on the total repeating units contained in the polyamide resin, a content of the second aromatic amide repeating unit is 5 mol % to 60 mol %.

8. The polyamide resin film of claim 1 , wherein
the first aromatic amide repeating unit is a repeating unit represented by Chemical Formula 1:

in the Chemical Formula 1,
Ar 1 is a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 20 carbon atoms, and
the second aromatic amide repeating unit is a repeating unit represented by Chemical Formula 2:

in the Chemical Formula 2,
Ar 2 is a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 20 carbon atoms, and
wherein based on the total repeating units contained in the polyamide resin, a content of the first aromatic amide repeating unit is 60 mol % to 95 mol %, and a content of the second aromatic amide repeating unit is 5 mol % to 40 mol %.

9. The polyamide resin film of claim 1 , wherein
the first polyamide segment has a number average molecular weight of 100 g/mol to 5000 g/mol.

10. The polyamide resin film of claim 1 , wherein
the alternating repeating unit represented by Chemical Formula 3 is a repeating unit represented by Chemical Formula 4:

in the Chemical Formula 4,
Ar 1 and Ar 2 are each independently a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, or a substituted or unsubstituted heteroarylene group having 2 to 20 carbon atoms,
a1 and a2 are each independently an integer of 1 to 10, and
b1 and b2 are each independently an integer of 1 to 5.

11. The polyamide resin film of claim 1 , wherein
the first aromatic amide repeating unit is an amide repeating unit derived from a combination of a 1,4-aromatic diacyl compound and an aromatic diamine compound.

12. The polyamide resin film of claim 11 , wherein
the 1,4-aromatic diacyl compound includes terephthaloyl chloride, or terephthalic acid, and
the aromatic diamine compound includes 2,2′-bis(trifluoromethyl)-4,4′-biphenyldiamine.

13. The polyamide resin film of claim 1 , wherein
the second aromatic amide repeating unit includes an amide repeating unit derived from a combination of a 1,2-aromatic diacyl compound and an aromatic diamine compound, or a repeating unit derived from a combination of a 1,3-aromatic diacyl compound and an aromatic diamine compound.

14. The polyamide resin film of claim 13 , wherein
the 1,2-aromatic diacyl compound includes phthaloyl chloride, or phthalic acid,
the 1,3-aromatic diacyl compound includes isophthaloyl chloride or isophthalic acid, and
the aromatic diamine compound includes 2,2′-bis(trifluoromethyl)-4,4′-biphenyldiamine.

15. The polyamide resin film of claim 1 , further comprising an ultraviolet light stabilizer dispersed in the polyamide resin.

16. The polyamide resin film of claim 15 , wherein
the ultraviolet light stabilizer includes one or more compounds selected from the group consisting of a triazine-based UV absorber, a triazole-based UV absorber, and a HALS-based UV absorber.

17. The polyamide resin film of claim 16 , wherein
the triazole-based UV absorber includes a compound represented by Chemical Formula 11:

in the Chemical Formula 11,
R 1 and R 2 are each independently hydrogen or an alkyl group having 1 to 20 carbon atoms.

18. A resin laminate comprising:
a substrate including the polyamide resin film of claim 1 ; and
a hard coating layer formed on at least one side of the substrate.

Assignees

• Lg Chemical Ltd

Inventors

• Choi Il Hwan
• Tae Young Ji
• Park Soonyong
• Park Youngseok
• Ryu Bi Oh

Classifications

• B32B2307/412

  Transparent · CPC title

• B32B2307/71

  Resistive to light or to UV · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• C08L2203/20

  use in electrical or conductive gadgets · CPC title

• C08K5/3492

  Triazines · CPC title