JP2003253222A - Adhesive protecting film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive protecting film which ensures solvent resistance and transparency, has good flexibility and applicability to three- dimensionally curved surfaces, and has excellent easy combustibility. <P>SOLUTION: This substantially transparent adhesive protecting film in which an adhesive layer is disposed on one side of a dehalogenated thermoplastic resin substrate film is characterized in that the dehalogenated thermoplastic resin substrate film preferably having a modulus of 4 to 30 N/15 mm on an elongation of 2% has the laminated structure of an outer layer cross-linked resin film having a distance of 200 to 400 between cross-linked points and obtained by cross-linking a thermoplastic resin preferably with an isocyanate- based cross-linking agent to an inner layer un-cross-linked resin film facing the adhesive layer. The dehalogenated thermoplastic resin substrate film preferably contains a UV light absorbent and a hindered amine-based photostabilizer in amounts of 0.5 to 6.0 pts.wt. and 0.1 to 3.0 pts.wt., respectively, per 100 pts.wt. of the resin. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a pressure-sensitive adhesive protective film, and more particularly to a pressure-sensitive adhesive protective film which is excellent in weather resistance, transparency, solvent resistance, workability and environment. still,
The pressure-sensitive adhesive protective film of the present invention is also referred to as an overlay film and also includes a pressure-sensitive adhesive protective sheet.

[0002]

2. Description of the Related Art Conventionally, a decorative pressure-sensitive adhesive film having a pressure-sensitive adhesive layer provided on the surface of a relatively flexible thermoplastic resin film substrate has been used, for example, in signboards, advertisement towers used outdoors,
Advertising stickers used for shutters, show windows, etc .; Decorative stripe stickers used for vehicles such as automobiles and motorcycles and ships such as motor boats; Display stickers used for traffic signs, road signs, guide boards, etc. It is used for a wide range of applications and is also called marking film.

The adhesive protective film is attached to such a marking film to protect the surface and is used for improving weather resistance. Therefore, the pressure-sensitive adhesive protective film is required to have weather resistance (ultraviolet ray shielding property) and appropriate flexibility so that it can be easily attached to a cubic curved surface. Conventional adhesive protective films are generally vinyl chloride resin film or acrylic resin film as a base material, and after kneading an ultraviolet absorber and the like, one surface is coated with an appropriate pressure-sensitive or heat-sensitive adhesive depending on the application. To form a pressure-sensitive adhesive layer, and is further laminated with a release material such as release paper for the purpose of protecting the pressure-sensitive adhesive layer. At the time of use, the release material is peeled off and attached to a predetermined location. Met.

An adhesive protective film having a vinyl chloride resin film as a base material cannot be processed by a simple incineration facility because hydrogen chloride gas and dioxin are generated when it is incinerated and discarded, and the durability of the incineration facility is further improved. There was a problem of lowering it. When an acrylic resin film is used as the base material, an uncrosslinked type resin is used when a flexible film is manufactured by an extruder from the viewpoint of productivity, and there is a problem that the solvent resistance is poor. It was

For the purpose of improving solvent resistance, for example, a protective layer is obtained from a mixture of a hydroxy group-containing acrylic polyol and a polyfunctional curing agent. An adhesive protective film has been proposed (see Japanese Patent Application Laid-Open No. 2-131940). However, the film described in this publication has a protective layer of 2
It is required that the modulus at% elongation be at least 550 MPa, and the elastic modulus of the entire pressure-sensitive adhesive protective film is necessarily high, so that it is more workable as a normal pressure-sensitive adhesive protective film (overlay protective film). Was in need of improvement.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the conventional pressure-sensitive adhesive protective film, and its purpose is to ensure solvent resistance, transparency, flexibility and tertiary An object of the present invention is to provide an adhesive protective film which has good workability on a curved surface and excellent in incineration.

[0007]

The invention according to claim 1 is
In order to achieve the above object, a substantially transparent pressure-sensitive adhesive protective film having a pressure-sensitive adhesive layer provided on one surface of a dehalogenated thermoplastic resin substrate film, wherein the dehalogenated thermoplastic resin substrate film is , Distance between bridge points 200-400
There is provided a pressure-sensitive adhesive protective film having a laminated structure of an outer-layer cross-linked resin film obtained by cross-linking a thermoplastic resin with the above-mentioned cross-linking agent and an inner-layer uncross-linked resin film facing the pressure-sensitive adhesive layer. The invention according to claim 2 provides the adhesive protective film according to claim 1, wherein the modulus of the dehalogenated thermoplastic resin substrate film at 2% elongation is 4 to 30 N / 15 mm.

According to the third aspect of the invention, the halogen-free thermoplastic resin substrate film is made of at least one of acrylic resin, polyester resin, polycarbonate resin and polyurethane resin. Item 1. An adhesive protective film according to item 1 or 2. Also,
In the invention according to claim 4, the dehalogenated thermoplastic resin substrate film contains 0.5 part to 6.0 parts by weight of an ultraviolet absorber and 100 parts by weight of a hindered amine light stabilizer per 100 parts by weight of the resin. The pressure-sensitive adhesive protective film according to any one of claims 1 to 3, which comprises 1 to 3.0 parts by weight.

The present invention will be described in more detail below. The dehalogenated thermoplastic resin substrate film in the present invention,
The outer layer crosslinked resin film, which is substantially transparent having a laminated structure of the inner layer uncrosslinked resin film,
Dehalogenated thermoplastic resin constituting such a base film, that is, as a thermoplastic resin containing substantially no halogen element, incineration treatment is easy and good weather resistance,
Acrylic resins, polyester resins, polycarbonate resins or polyurethane resins are preferable, and acrylic resins are particularly preferable in terms of good weather resistance.

In the outer layer crosslinked resin film, for example, an acrylic resin having various hydroxyl groups is used and the distance between the crosslinked points is 200 to 200.
It is a resin film obtained by crosslinking with 400 crosslinking agents. As the acrylic resin having a hydroxyl group, a copolymer of a (meth) acrylic acid ester monomer copolymerizable with a hydroxyl group-containing monomer such as 2-hydroxyethyl acrylate or 2-hydroxyethyl (meth) acrylate can be favorably used. . Here, the (meth) acrylic acid ester monomer used as the main component has a carbon number of 1
A (meth) acrylic acid ester of an alcohol having an alkyl group of ˜12, preferably a (meth) acrylic acid ester having an alkyl group of a carbon number of 4 to 12 is used, and specifically, n-butyl (meth) acrylate is used. , 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-octyl (meth) acrylate, (meth)
Examples thereof include isononyl acrylate and lauryl (meth) acrylate. These can be used alone or in combination.

The cross-linking agent used for the outer layer cross-linked resin film in the present invention needs to have a distance between cross-linking points of 200 to 400. Here, the distance between cross-linking points means (weight average molecular weight of cross-linking agent / number of cross-linking functional groups), and when the distance between cross-linking points is shorter than 200, sufficient flexibility cannot be expressed in the base film, When it exceeds 400, the composition becomes too soft and the curability of the cross-linking agent deteriorates, resulting in a marked decrease in productivity. The effect of the specific distance between the cross-linking points is similar to that of the acrylic resin for the polyester resin, the polycarbonate resin, and the urethane resin.

Examples of the cross-linking agent include isocyanate cross-linking agents, aziridine cross-linking agents and epoxy cross-linking agents. In the present invention, when a liquid dehalogenated thermoplastic resin is crosslinked with the above crosslinking agent,
Since the substrate film having good solvent resistance and flexibility as a substrate of the pressure-sensitive adhesive protective film can be easily obtained, the outer layer crosslinked resin film is usually a liquid dehalogenated thermoplastic resin crosslinked with the crosslinking agent. Manufactured. Isocyanate crosslinking agents are preferably used from the viewpoint of good pot life after mixing with the liquid dehalogenated thermoplastic resin, progress of gelation after drying, and the like. As the isocyanate-based cross-linking agent, hexamethylene diisocyanate-based cross-linking agent having good weather resistance is most preferably used.

The number of parts of the isocyanate crosslinking agent added is determined by the OH value of the dehalogenated thermoplastic resin constituting the outer layer crosslinked resin film and -NCO%.
The amount of -NCO added is about 10% by weight over the stoichiometrically reacted amount. Generally, the number of parts added is in the range of 5 to 50 parts by weight with respect to 100 parts by weight of the resin content of the dehalogenated thermoplastic resin.

A third component such as polyester diol may be added to the outer layer crosslinked resin as a softening additive. The amount of the compounding part is preferably 2 to 50 parts by weight with respect to 100 parts by weight of the resin content. When a pigment is blended, a generally used organic pigment having good weather resistance is preferably used.

As the acrylic resin constituting the inner layer uncrosslinked resin film, those obtained by polymerizing various (meth) acrylic monomers can be used. Usually, as the (meth) acrylic acid ester monomer used as the main component, Is a (meth) acrylic acid ester of an alcohol having an alkyl group having 1 to 12 carbon atoms, preferably 4 to 1 carbon atoms
A (meth) acrylic acid ester having 2 alkyl groups is used, and specifically, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth)
Examples thereof include isooctyl acrylate, n-octyl (meth) acrylate, isononyl (meth) acrylate, and lauryl (meth) acrylate. These can be used alone or in combination.

Further, in the present invention, in order to secure weather resistance (ultraviolet ray shielding property), an ultraviolet absorber is added to 100 parts by weight of each thermoplastic resin constituting the outer layer crosslinked resin film and the inner layer uncrosslinked resin film. Is 0.5 to 6.
It is preferably contained in an amount of 0 part by weight. If it is less than 0.5 parts, the weather resistance (UV shielding property) is not sufficiently expressed,
When it is more than 6.0 parts, the physical properties of the film are adversely affected. Specific examples of the ultraviolet absorber include benzophenone,
Examples thereof include benzotriazole and cyanoacrylate type.

In order to further improve the weather resistance, a hindered amine light stabilizer is added to 100 parts by weight of each thermoplastic resin constituting the outer layer crosslinked resin film and the inner layer uncrosslinked resin film in combination with an ultraviolet absorber. 0.1-3.
It is preferable to use 0 parts by weight together.

Specific preferred examples of the hindered amine light stabilizer include the following. 1) 2,2,4,4-Tetramethylpiperidyl-4-benzoate 2) Bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate 3) Tris (2,2,6,6-tetramethyl- 4-piperidyl)
Phosphite 4) 1,3,8-triaza 7,7,9,9-tetramethyl-3-n
-Octylspiro [4,5] decane-2,4-dione 5) 1,2,3,4-tetra (4-carbonyloxy 2,2,6,6-
Tetramethylpiperidyl) -butane 6) 1,3,8-triaza 7,7,9,9-tetramethyl-2,4-
Dioxosepyro [4,5] decane 7) tri (4-acetoxy-2,2,6,6-tetramethylpiperidyl) amine 8) 4-acetoxy-2,2,6,6-tetramethylpiperidyl 9) 4-stearoyl Oxy-2,2,6,6-tetramethylpiperidyl 10) 4-benzyloxy-2,2,6,6-tetramethylpiperidyl 11) 4-phenylcarbamoyloxy-2,2,6,6-tetramethylpiperidyl

In the dehalogenated thermoplastic resin base film of the present invention, other general-purpose additives (antistatic agent, antiblocking agent, antioxidant, inorganic filler, There is no problem that the organic filler etc.) is blended.

The thickness of the resin base film is generally 20 to 150 μm, preferably 40 to 80 μm for the inner layer uncrosslinked resin film layer. If the thickness is less than 20 μm, the film itself is too soft to be applied and the strength is insufficient. If the thickness exceeds 150 μm, the film becomes hard and the followability to the adherend such as a cubic curved surface is deteriorated. The outer layer crosslinked resin film layer is generally 2 to 30 μm, preferably 3 to 10 μm.
μm. If it is thinner than 2 μm, the solvent resistance is not sufficient,
If it is thicker than 30 μm, the productivity will deteriorate.

The method for obtaining the inner layer uncrosslinked resin film in the present invention is not particularly limited, and for example, the dehalogenated thermoplastic resin is extruded using a T-die,
A method of calender molding using a calender roll is adopted. Further, the outer layer crosslinked resin film, for example, the main agent is a liquid dehalogenated thermoplastic resin to which an ultraviolet absorber, a hindered amine light stabilizer, and other additives are added, if necessary, and the above crosslinking agent is mixed. After that, on the uncrosslinked resin film, a method of coating by a gravure coater, a comma coater, a reverse coater, a knife coater, a spray gun, a screen printing, etc. and heating and drying / curing, is laminated on the inner layer uncrosslinked resin film. It can be obtained in a standing state.

The pressure-sensitive adhesive used in the pressure-sensitive adhesive layer of the present invention may be either an acrylic resin-based or rubber-based pressure-sensitive adhesive, but since the pressure-sensitive adhesive protective film of the present invention is often used outdoors, it has high weather resistance. Acrylic is preferred. A (meth) acrylic acid ester monomer is used as a main raw material in the acrylic pressure-sensitive adhesive, and a (meth) acrylic acid ester of alcohol having an alkyl group having 1 to 12 carbon atoms is used as the (meth) acrylic acid ester monomer. Preferably, a (meth) acrylic acid ester having an alkyl group having 4 to 12 carbon atoms is used, and specifically, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and (meth) acrylic acid. Isooctyl, n-octyl (meth) acrylate, isononyl (meth) acrylate,
Examples thereof include lauryl (meth) acrylate.
These can be used for polymerization alone or in combination.

From the balance of tackiness and cohesiveness, etc.,
The homopolymer has a glass transition temperature (Tg) of −50 ° C. or lower as a main component of (meth) acrylic acid ester, and (meth)
(Meth) acrylic acid esters of lower alcohols such as methyl acrylate and ethyl (meth) acrylate can be used in combination. In addition to these vinyl monomers, monomers copolymerizable with them may be copolymerized. Examples of the monomer include carboxyl group-containing monomers such as (meth) acrylic acid, maleic acid, fumaric acid, and itaconic acid, or anhydrides thereof, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl acrylate, polyoxyethylene (meth). ) Hydroxyl group-containing monomers such as acrylate, polyoxypropylene (meth) acrylate, and caprolactone modified (meth) acrylate.

The pressure-sensitive adhesive used in the present invention may be a solvent-type acrylic pressure-sensitive adhesive polymerized in a solvent,
It may be an emulsion-type pressure-sensitive adhesive polymerized in water.
Further, it may be a bulk polymerization type pressure-sensitive adhesive obtained by irradiating the monomer mixture with ultraviolet rays. The thickness of the adhesive layer is preferably 20 to 50 μm.

In general, the pressure-sensitive adhesive protective film of the present invention is obtained by applying a pressure-sensitive adhesive to a release material by a quantitative coating method such as a reverse coating method, heating and drying the same, and then applying the above halogen-free thermoplastic resin substrate film. It is produced by laminating the inner layer with the uncrosslinked resin film. The release material in this case is not particularly limited and, for example, silicone coated release paper or the like can be used, and it is usually used as it is as a release material in the final product form of the pressure-sensitive adhesive protective film of the present invention.

[0026]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited thereto. The term "parts" means "parts by weight". <Example 1> (Preparation of inner layer uncrosslinked resin film) Cooling tube, stirring device,
In a four-necked flask equipped with a thermometer and a nitrogen inlet tube, n-butyl methacrylate 57 parts and methyl methacrylate 30
Parts, 10 parts of 2-hydroxyethyl methacrylate, 3 parts of acrylic acid and 100 parts of methyl ethyl ketone, and 0.5 parts of azobisisobutyronitrile as a polymerization initiator are charged, and the mixture is stirred at 80 ° C. under a nitrogen atmosphere.
The temperature was raised to, and the resin was polymerized to obtain a resin for forming the inner layer uncrosslinked resin film. This resin had a weight average molecular weight of 70,000 and a glass transition temperature of 47 ° C.

The above resin was dried, and 2 parts of an ultraviolet absorber "Adeka Stab LA-32" (manufactured by Asahi Denka Kogyo Co., Ltd.) and 100 parts of the resin, and a hindered amine light stabilizer "L" were used.
A601 "(manufactured by Asahi Denka Kogyo Co., Ltd.) was added, and an acrylic resin film having a thickness of 40 μm was formed by extrusion molding using a T-type die.

(Preparation of Dehalogenated Thermoplastic Resin Base Film) On the other hand, the acrylic paint "Planit U # 50"
0 "[polymer containing (meth) acrylic acid ester-based monomer as a main component, manufactured by Dainippon Paint Co., Ltd.] 100 parts, UV absorber" Adeka Stab LA-32 "(Asahi Denka Kogyo)
Co., Ltd.), 2 parts, hindered amine light stabilizer "LA
601 "(manufactured by Asahi Denka Kogyo Co., Ltd.) was added to the base compound, and an isocyanate cross-linking agent" Coronate HL "(weight average molecular weight 854, functional group number 4, cross-linking distance 21) was added.
5. A coating solution containing 20 parts of Nippon Polyurethane Co., Ltd. was applied onto the uncrosslinked acrylic resin film with a reverse coater, dried and cured to obtain an outer layer crosslinked resin film having a dry thickness of 5 μm. It was

Then, a two-pack cross-linking acrylic adhesive is
A silicon coater-type release paper was coated with a comma coater to a dry thickness of 30 μm to form a film. This was laminated on the uncrosslinked acrylic resin film on which the outer layer crosslinked resin film was laminated to obtain the desired adhesive protective film (total thickness excluding release paper: 75 μm).

<Example 2>"SumijourHT" (weight average molecular weight 690, number of functional groups 3, distance between crosslinking points 230, Sumitomo Bayer Urethane) was used as an isocyanate crosslinking agent.
A target adhesive protective film was obtained in the same manner as in Example 1 except that the amount was 18 parts.

<Example 3> (Preparation of inner layer uncrosslinked resin film) Cooling tube, stirring device,
In a four-necked flask equipped with a thermometer and a nitrogen inlet tube, 45 parts of n-butyl methacrylate and 30 parts of methyl methacrylate.
Parts, 20 parts of 2-hydroxyethyl methacrylate, 5 parts of acrylic acid and 100 parts of methyl ethyl ketone, and 0.5 part of azobisisobutyronitrile as a polymerization initiator are charged, and the mixture is stirred at 80 ° C. under a nitrogen atmosphere.
The temperature was raised to, and the resin was polymerized to obtain a resin for forming the inner layer uncrosslinked resin film. This resin had a weight average molecular weight of 65,000 and a glass transition temperature of 55 ° C. An inner layer uncrosslinked resin film and an outer layer crosslinked resin film were obtained in the same manner as in Example 1 except that the above resin was used, and the target adhesive protective film was obtained using the same adhesive.

<Example 4> In Example 1 (Preparation of dehalogenated thermoplastic resin substrate film), the coating material in the main component was polyester based "Planit U # 555".
A target adhesive protective film was obtained in the same manner as in Example 1 except that the product was changed to (Dainippon Paint Co., Ltd.).

<Comparative Example 1> In the same manner as in Example 1, except that the outer layer crosslinked resin film was not used in (Preparation of dehalogenated thermoplastic resin substrate film) of Example 1, the purpose of the invention is as follows. An adhesive protective film was obtained (total thickness 70 μm excluding release paper).

<Comparative Example 2> The cross-linking agent was "Sumijour N3".
200 "(weight average molecular weight 450, number of functional groups 3, distance between crosslinking points 150, manufactured by Sumitomo Bayer Urethane Co., Ltd.) was changed to 15 parts to obtain an adhesive protective film in the same manner as in Example 1. <Comparative Example 3> The cross-linking agent was "Desmodur TPLS2010 / 1" (weight average molecular weight 1680,
An adhesive protective film was obtained in the same manner as in Example 1 except that the number of functional groups was 4, the distance between cross-linking points was 420, and the amount was 30 parts by Sumitomo Bayer Urethane Co., Ltd.

<Comparative Example 4> In Example 1 (Preparation of dehalogenated thermoplastic resin substrate film), the outer layer cross-linked resin film was not used at all, and the ultraviolet absorber "Adeka Stab LA-32" (Asahi) was used. Denka Kogyo Co., Ltd.) 0.3 parts per 100 parts of acrylic paint "Planit U # 500" [polymer mainly composed of (meth) acrylic acid ester monomer, manufactured by Dainippon Paint Co., Ltd.] An adhesive protective film was obtained in the same manner as in Example 1 except that the amount was reduced to 10 parts (total thickness excluding release paper: 70 μm).

The pressure-sensitive adhesive protective films obtained in the above Examples and Comparative Examples were evaluated by the following methods, and the results are shown in Table 1.

[0037]

[Table 1]

Each evaluation method is as follows. <3rd-order curved surface workability> The adhesive protective film is first adhered to the corrugated board 1 shown in FIG. 1 at the peaks (vertices) of the corrugated board, and then the film is applied to the valleys with a dedicated construction tool, a spatula. The floating state of the film after pushing and 23 ° C. × 3 days was observed and evaluated. ○ ・ ・ It has appropriate flexibility and there were no problems in construction on curved surface adherends. △ ・ Since the film modulus is not appropriate, it is difficult to apply it to curved adherends. × ・ It is impossible to apply it to curved adherends because the film modulus is not appropriate.

<Film flexibility> The prepared adhesive protective film is slit into a width of 15 mm and 2% by a tensile tester.
The modulus at extension was evaluated. <Solvent resistance> Methanol was dropped on the surface of the produced pressure-sensitive adhesive protective film, and the surface state after drying was observed and evaluated. ○ ・ ・ ・ ・ No change on the surface was observed. × ・ ・ ・ ・ Whitening occurred on the surface.

<Determination of incineration possibility> Each of the prepared pressure-sensitive adhesive protective films was sampled in a size of 5 cm square, burned in a closed container, and the gas was further collected into a syringe. Using a gas chromatograph, hydrogen chloride and chlorine gas were generated. Was qualitatively analyzed. ◯: Hydrogen chloride and hydrogen gas were not detected. X ... Hydrogen chloride or hydrogen gas was detected.

<Weather resistance> The prepared adhesive protection film was used for 200 times with a Super UV tester manufactured by Dainippon Plastics Co., Ltd.
After conducting the accelerated exposure test for a time (corresponding to about 5 years), the ultraviolet transmittance was measured.

[0042]

The pressure-sensitive adhesive protective film of the present invention is configured as described above, and the thermoplastic resin substrate film is a substantially transparent one made of a halogen-free thermoplastic resin, and also has an outer layer cross-linking resin. Since the film is obtained by the reaction of a thermoplastic resin and a crosslinking agent having a distance between crosslinking points of 200 to 400, the solvent resistance is good, and the flexibility and the workability on a cubic surface are good. It excels in simple incineration. When the thermoplastic resin substrate film contains a specific proportion of an ultraviolet absorber, particularly when a hindered amine light stabilizer is used in combination, excellent weather resistance is exhibited. In addition, as it does not use halogen-based materials as described above, there is no need for landfill disposal as in the past after using it, and since it is an adhesive protection film that can be incinerated and discarded in a simple incinerator, it is an environmentally friendly product. It is extremely useful practically in this field.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a corrugated plate having a bent surface.

Claims (4)

[Claims] 1. A substantially transparent pressure-sensitive adhesive protective film comprising an adhesive layer provided on one surface of a dehalogenated thermoplastic resin substrate film, wherein the dehalogenated thermoplastic resin substrate film has a crosslinking point. It is characterized by having a laminated structure of an outer layer crosslinked resin film obtained by crosslinking a thermoplastic resin with a crosslinking agent having a distance of 200 to 400, and an inner layer uncrosslinked resin film facing the pressure-sensitive adhesive layer. Adhesive protection film. 2. The adhesive protective film according to claim 1, wherein the dehalogenated thermoplastic resin substrate film has a modulus at 2% elongation of 4 to 30 N / 15 mm. 3. The halogen-free thermoplastic resin substrate film is at least one of acrylic resin, polyester resin, polycarbonate resin and polyurethane resin.
Claim 1 or 2 which consists of a seed.
The adhesive protective film described. 4. The dehalogenated thermoplastic resin substrate film contains 0.5 parts of an ultraviolet absorber per 100 parts by weight of the resin.
Parts to 6.0 parts by weight and 0.1 to 3.0 parts by weight of a hindered amine light stabilizer, and the pressure-sensitive adhesive protective film according to claim 1, wherein