# US 2014/0193611 A1 · Surface protection film and optical film with surface protection film

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- Number: US 2014/0193611 A1
- Document ID: US20140193611A1
- Status: Published application
- Kind: A1
- Application number: 14/198,950
- Filed: 2014-03-06
- Published: 2014-07-10
- Earliest claimed: 2006-10-18
- Assignees: Nitto Denko Corporation
- Applicants: Nitto Denko Corporation
- Inventors: Takumi Yutou; Shinichi Takada; Mitsushi Yamamoto; Kazuhito Okumura
- Web page: https://patentgrep.com/patent/US20140193611A1

## CPC

- G02B 1/14: Protective coatings, e.g. hard coatings
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- C09J 7/22: Plastics; Metallised plastics
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- G02B 1/105
- G02B 5/04: Prisms
- G02B 27/0006: {with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B)}
- Y10T 428/24355: Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T 428/24942: including components having same physical characteristic in differing degree
- Y10T 428/28: Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T 428/2848: Three or more layers
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

There are provided an optical surface protection film capable of permitting even a visual inspection of a coated body having a fine roughness, such as a prism sheet, to be performed under the condition that the protection film is attached to the coated body and excelling in adhesion reliability without an optical adverse effect on the coated body, and an optical film with the surface protection film. The optical surface protection film (1) has a base material layer (10) and an adhesive layer (12) stacked on one surface of the base material layer. The surface of the base material layer (10) on the side of the adhesive layer (12) has an arithmetic surface average roughness (Ra2) of 0.65 μm or less. The other surface of the base material layer (10) has an arithmetic surface average roughness (Ra1) of 0.6 μm or more.

## Claims

### Claim 1

An optical surface protection film, comprising:
a substrate layer; and
a pressure-sensitive adhesive layer placed on one side of the substrate layer, wherein
the substrate layer has a pressure-sensitive adhesive layer-side surface with an arithmetic average surface roughness (Ra2) of 0.65 μm or less and another surface with an arithmetic average surface roughness (Ra1) of 0.6 μm or more.

### Claim 2 (depends on 1)

The optical surface protection film of claim 1, wherein it has a haze value of 30 to 75%.

### Claim 3 (depends on 1, 2)

The optical surface protection film of claim 1 or claim 2, wherein the adhesive thickness is 2 to 10 μm.

### Claim 4 (depends on 1)

The optical surface protection film of claim 1, wherein the pressure-sensitive adhesive layer is made of a rubber-based pressure-sensitive adhesive.

### Claim 5 (depends on 1)

The optical surface protection film of claim 1, wherein it is for use in protecting a prism sheet surface.

### Claim 6 (depends on 1)

An optical film with surface protection film, comprising:
an optical film; and
the optical surface protection film of claim 1 attached to one or both sides of the optical film.

### Claim 7 (depends on 1)

A prism sheet with surface protection film, comprising:
a prism sheet; and
the optical surface protection film of claim 1 attached to one or both sides of the prism sheet.