Polyester film, polarizing plate, and image display device

JP2026102721APending Publication Date: 2026-06-23DAI NIPPON PRINTING CO LTD
View PDF 1 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
DAI NIPPON PRINTING CO LTD
Filing Date
2026-03-10
Publication Date
2026-06-23

AI Technical Summary

Benefits of technology

【0010】 本開示のポリエステルフィルム、偏光板及び画像表示装置は、ポリエステルフィルムの厚みを厚くすることなく鉛筆硬度を良好にすることができ、かつ、機能層との密着性を良好にすることができる。

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2026102721000002
    Figure 2026102721000002
  • Figure 2026102721000003
    Figure 2026102721000003
  • Figure 2026102721000004
    Figure 2026102721000004
Patent Text Reader

Abstract

To provide a polyester film with good pencil hardness without increasing its thickness. [Solution] The standard deviation 3σ of the Martens hardness on the surface of the polyester film is 9.0 N / mm 2 More than 36.0N / mm 2 The following is a polyester film.
Need to check novelty before this filing date? Find Prior Art

Claims

1. The standard deviation 3σ of the Martens hardness on the surface of the polyester film is 9.0 N / mm ２ 36.0N / mm or more ２ The following is a polyester film.

2. The polyester film according to claim 1, wherein the standard deviation 3σ of the mean of the elastic deformation power of the surface of the polyester film is 7.0% or less.

3. The polyester film according to claim 1 or 2, wherein the average elastic deformation power of the surface of the polyester film is 40.0% or more.

4. The polyester film according to any one of claims 1 to 3, wherein the in-plane phase difference of the polyester film is 300 nm or more and 1450 nm or less.

5. The polyester film according to any one of claims 1 to 4, wherein the value obtained by dividing the in-plane phase difference of the polyester film by the phase difference in the thickness direction of the polyester film is 0.15 or less.

6. The polyester film according to any one of claims 1 to 5, wherein the thickness of the polyester film is 10 μm or more and 80 μm or less.

7. A polarizing plate having a polarizer, a first transparent protective plate disposed on one side of the polarizer, and a second transparent protective plate disposed on the other side of the polarizer, wherein at least one of the first transparent protective plate and the second transparent protective plate is a polyester film according to any one of claims 1 to 6.

8. An image display device having a display element and a polyester film disposed on the light-emitting surface side of the display element, wherein the polyester film is the polyester film described in any one of claims 1 to 6.

9. The image display device according to claim 8, further comprising a polarizer between the display element and the polyester film.