# US 10,245,811 B2 · Surface-protecting film

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- Number: US 10,245,811 B2
- Document ID: US10245811B2
- Status: Granted
- Kind: B2
- Application number: 15/037,815
- Filed: 2014-11-20
- Published: 2016-10-13
- Granted: 2019-04-02
- Earliest claimed: 2013-11-21
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Tomoyuki Kitajima; Keito Hishinuma
- Web page: https://patentgrep.com/patent/US10245811B2

## CPC

- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 7/06: permitting easy separation
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- C08L 33/06: of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
- C09J 7/22: Plastics; Metallised plastics
- C09J 7/241: {Polyolefin, e.g.rubber}
- C09J 7/38: Pressure-sensitive adhesives [PSA]
- C09J 153/02: Vinyl aromatic monomers and conjugated dienes
- B32B 2250/24: All layers being polymeric
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/412: Transparent
- B32B 2307/748: Releasability
- B32B 2405/00: Adhesive articles, e.g. adhesive tapes
- B32B 2571/00: Protective equipment
- C09J 133/00: Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J 2301/302: the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
- C09J 2301/414: presence of a copolymer
- C09J 2423/006: in the substrate
- C09J 2425/00: Presence of styrenic polymer
- C09J 2433/00: Presence of (meth)acrylic polymer
- C09J 2453/00: Presence of block copolymer
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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)

## Abstract

The surface protective film of the present invention is characterized in that the film comprises a polyolefin-based substrate layer and a pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer contains at least a styrene-based elastomer, an acrylic-based pressure-sensitive adhesive and a tackifier, and in the pressure-sensitive adhesive layer, the styrene-based elastomer is blended in an amount of not less than 50% by mass but not more than 90% by mass based on the total amount of the pressure-sensitive adhesive layer, the acrylic-based pressure-sensitive adhesive is blended in an amount of not less than 1% by mass but not more than 40% by mass based on the total amount of the pressure-sensitive adhesive layer, and the tackifier is blended in an amount of not less than 1% by mass but not more than 49% by mass based on the total amount of the pressure-sensitive adhesive layer.

## Claims

### Claim 1

A surface protective film, comprising:
a polyolefin-based substrate layer and
a pressure-sensitive adhesive layer,
wherein:
the pressure-sensitive adhesive layer comprises:
a styrene-based elastomer,
an acrylic-based pressure-sensitive adhesive, and
a tackifier, and
in the pressure-sensitive adhesive layer,
the styrene-based elastomer is blended in an amount of not less than 50% by mass but not more than 90% by mass based on the total amount of the pressure-sensitive adhesive layer,
the acrylic-based pressure-sensitive adhesive is blended in an amount of not less than 1% by mass but not more than 40% by mass based on the total amount of the pressure-sensitive adhesive layer, and
the tackifier is blended in an amount of not less than 1% by mass but not more than 49% by mass based on the total amount of the pressure-sensitive adhesive layer,
the acrylic-based pressure-sensitive adhesive comprises, as a constituent, a polymer of a structure represented by formula (3),
[C-D-C]n (3),
wherein C represents a polymer block C,
D represents a polymer block D, and
n represents an integer of 1 to 3,
the polymer block C is a polymer block composed of continuous methacrylic ester units, and
the polymer block D is a polymer block composed of continuous acrylic ester units.

### Claim 2

A surface protective film, comprising:
a polyolefin-based substrate layer and
a pressure-sensitive adhesive layer,
wherein:
the pressure-sensitive adhesive layer comprises
a styrene-based elastomer and
an acrylic-based pressure-sensitive adhesive, and
in the pressure-sensitive adhesive layer,
the styrene-based elastomer is blended in an amount of not less than 60% by mass but not more than 90% by mass based on the total amount of the pressure-sensitive adhesive layer, and
the acrylic-based pressure-sensitive adhesive is blended in an amount of not less than 10% by mass but not more than 40% by mass based on the total amount of the pressure-sensitive adhesive layer,
the acrylic-based pressure-sensitive adhesive comprises, as a constituent, a polymer of a structure represented by formula (3),
[C-D-C]n (3),
wherein C represents a polymer block C,
D represents a polymer block D, and
n represents an integer of 1 to 3,
the polymer block C is a polymer block composed of continuous methacrylic ester units, and
the polymer block D is a polymer block composed of continuous acrylic ester units.

### Claim 3

A surface protective film, comprising:
a polyolefin-based substrate layer, and
a pressure-sensitive adhesive layer,
wherein:
the pressure-sensitive adhesive layer, comprising:
a styrene-based elastomer and
an acrylic-based pressure-sensitive adhesive, and
optionally a tackifier, and
in the pressure-sensitive adhesive layer,
the styrene-based elastomer is blended in an amount of not less than 50% by mass but not more than 90% by mass based on the total amount of the pressure-sensitive adhesive layer,
the acrylic-based pressure-sensitive adhesive is blended in an amount of not less than 1% by mass but not more than 40% by mass based on the total amount of the pressure-sensitive adhesive layer, and
the tackifier, if present, is blended in an amount of not more than 49% by mass based on the total amount of the pressure-sensitive adhesive layer,
the acrylic-based pressure-sensitive adhesive comprises, as a constituent, a polymer of a structure represented by formula (3),
[C-D-C]n (3),
wherein C represents a polymer block C,
D represents a polymer block D, and
n represents an integer of 1 to 3,
the polymer block C is a polymer block composed of continuous methacrylic ester units, and
the polymer block D is a polymer block composed of continuous acrylic ester units.

### Claim 4 (depends on 1)

The surface protective film of claim 1,
wherein the styrene-based elastomer has
a styrene content of not less than 5% by mass but not more than 30% by mass, and
a diblock copolymer content of not more than 50% by mass,
based on the total amount of the styrene-based elastomer.

### Claim 5 (depends on 1)

The surface protective film of claim 1,
wherein the pressure-sensitive adhesive layer has a thickness of not more than 10 μm.

### Claim 6 (depends on 1)

The surface protective film of claim 1,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 7 (depends on 4)

The surface protective film of claim 4,
wherein the pressure-sensitive adhesive layer has a thickness of not more than 10 μm.

### Claim 8 (depends on 4)

The surface protective film of claim 4,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 9 (depends on 5)

The surface protective film of claim 5,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 10 (depends on 2)

The surface protective film of claim 2,
wherein the styrene-based elastomer has
a styrene content of not less than 5% by mass but not more than 30% by mass, and
a diblock copolymer content of not more than 50% by mass,
based on the total amount of the styrene-based elastomer.

### Claim 11 (depends on 2)

The surface protective film of claim 2,
wherein the pressure-sensitive adhesive layer has a thickness of not more than 10 μm.

### Claim 12 (depends on 2)

The surface protective film of claim 2,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 13 (depends on 10)

The surface protective film of claim 10,
wherein the pressure-sensitive adhesive layer has a thickness of not more than 10 μm.

### Claim 14 (depends on 10)

The surface protective film of claim 10,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 15 (depends on 11)

The surface protective film of claim 11,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 16 (depends on 3)

The surface protective film of claim 3,
wherein the styrene-based elastomer has
a styrene content of not less than 5% by mass but not more than 30% by mass, and
a diblock copolymer content of not more than 50% by mass,
based on the total amount of the styrene-based elastomer.

### Claim 17 (depends on 3)

The surface protective film of claim 3,
wherein the pressure-sensitive adhesive layer has a thickness of not more than 10 μm.

### Claim 18 (depends on 3)

The surface protective film of claim 3,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.

### Claim 19 (depends on 16)

The surface protective film of claim 16,
wherein the pressure-sensitive adhesive layer has a thickness of not more than 10 μm.

### Claim 20 (depends on 16)

The surface protective film of claim 16,
wherein the pressure-sensitive adhesive layer is laminated by a co-extrusion method.