Title:
OPTICAL FILM HAVING COVER FILM
Document Type and Number:
Japanese Patent JP2023006651
Kind Code:
A
Abstract:
To provide an optical film having a cover film appropriate for removing one cover film from a thin optical film having an adhesive layer while preventing the other cover film from separating and an end portion of the optical film from cracking, while appropriate for preventing the adhesive layer from separating from the optical film at bending.SOLUTION: An optical film X1 having a cover film includes an optical film 10, adhesive layers 20 and 30 and cover films 40 and 50. The optical film 10 is 100 μm thick of less, the adhesive layers 20 and 30 are 5 to 100 μm thick, the cover film 40 is 40 to 80 μm thick H4, the cover film 50 is 40 to 80 μm thick H5, and a ratio (H4/H5) is 1 or less. The adhesive layers 20 and 30 have storage modulus of 20 to 100 kPa. First peel force of the cover film 40 is 10 gf/25 mm or less. A ratio of the first peel force is 0.9 or less with regard to second peel force when separating the cover film 50.SELECTED DRAWING: Figure 1
Inventors:
MIURA DAISEI
NODA MINAKO
TAKARADA SHO
NODA MINAKO
TAKARADA SHO
Application Number:
JP2021109360A
Publication Date:
January 18, 2023
Filing Date:
June 30, 2021
Export Citation:
Assignee:
NITTO DENKO CORP
International Classes:
B32B27/00; C09J7/38; G02B5/30
Attorney, Agent or Firm:
Hiroyuki Okamoto
Shinichi Uda
Shinichi Uda