OPTICAL FILM AND PROCESS FOR PRODUCING THE SAME

• US 20120301676A1
• Filed: 02/22/2011
• Published: 11/29/2012
• Est. Priority Date: 03/05/2010
• Status: Abandoned Application

• Current Assignee: Daicel Corporation
• Original Assignee: Daicel Corporation
• Inventors: Ushida, Hiroaki, Hayashi, Masaki
• Application Number:
  US13/577,820
• Publication Number:
  US 20120301676A1
• Time in Patent Office: Days
• US Class Current: 428/148
• CPC Class Codes: G02B 1/105 Protective coatings
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 1/16 having an anti-static effect, e.g. electrically conducting coatings
• CPC Class Codes: Y10T 428/24413 Metal or metal compound
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof

Abstract

A hardcoat layer is a cured layer comprising a curable resin-precursor, a thermoplastic resin, and a fine particle having an average primary particle size of 1 to 100 nm, and the hardcoat layer is formed on at least one side of a transparent film. The thermoplastic resin may be a thermoplastic resin (particularly, a cellulose derivative) nonreactive to the curable resin-precursor. The ratio of the metal oxide fine particle is about 0.5 to 4 parts by weight relative to 100 parts by weight of the curable resin-precursor. The metal oxide fine particle may comprise at least one fine particle selected from the group consisting of antimony tin oxide, tin oxide, and zinc oxide. The curable resin-precursor may comprise a tetra- or more-functional precursor. The optical film of the present invention has excellent anti-glareness or anti-Newton-ring property and also has excellent abrasion resistance and mechanical properties.

Claims

1. An optical film comprising:

a transparent film; and

a hardcoat layer formed on at least one side of the transparent film,

wherein the hardcoat layer is a cured layer comprising;

a curable resin-precursor;

a thermoplastic resin; and

a metal oxide fine particle having an average primary particle size of 1 to 100 nm.

2. An optical film according to claim 1, wherein the thermoplastic resin is nonreactive to the curable resin-precursor.

3. An optical film according to claim 1, wherein the thermoplastic resin comprises a cellulose derivative.

4. An optical film according to claim 1, wherein the ratio of the metal oxide fine particle is 0.5 to 4 parts by weight relative to 100 parts by weight of the curable resin-precursor.

5. An optical film according to claim 1, wherein the metal oxide fine particle comprises at least one fine particle selected from the group consisting of antimony tin oxide, antimony oxide, tin oxide, and zinc oxide.

6. An optical film according to claim 1, wherein the curable resin-precursor comprises a tetra- or more-functional precursor.

7. An optical film according to claim 1, wherein the hardcoat layer has an uneven surface structure having an arithmetic average roughness (Ra) of 0.03 to 0.15 μ

m and an average spacing of concavo-convexes (Sm) of 50 to 300 μ

m.

8. An optical film according to claim 1, wherein the hardcoat layer is substantially free from a flocculating agent.

9. An optical film according to claim 1, which has a haze of 0.3 to 4%.

10. An optical film according to claim 1, which further comprises a low-refraction layer formed on the hardcoat layer.

11. A process for producing an optical film recited in claim 1, which comprises:

applying a coating composition on at least one side of a transparent film to form a coating layer, wherein the coating composition comprises a curable resin-precursor, a thermoplastic resin, and a metal oxide fine particle having an average primary particle size of 1 to 100 nm;

drying the coating layer; and

then

curing the curable resin-precursor of the dried coating layer by irradiating the dried layer with an active energy ray.

12. A process according to claim 11, wherein the coating composition is substantially free from a flocculating agent.