KR20190106658A - Pressure-sensitive adhesive sheet roll - Google Patents

Abstract

Provided is an adhesive sheet winding body (1) formed with a long adhesive sheet (10) having a first film (11), an adhesive layer (12), and a second film (13), wound around a cylindrical core (2), wherein a surface on the first film (11) is located inside. The adhesive sheet winding body (11) is characterized in that the adhesive layer (12) is made of acrylic adhesive, has a thickness of equal to or greater than 100 μm, and equal to or less than 1000 μm, and is configured to satisfy the following conditions A or B. Condition A: In a width direction of the adhesive layer (12), a thin film having a thickness which is 2 μm or more thinner than the maximum thickness of the adhesive layer (12) does not exist. Condition B: The thin film exists only in a region within 10% of the total width of both ends in the width direction of the adhesive layer (12), wherein the total width of the thin film is equal to or less than 10% of the total width of the adhesive layer (12). Accordingly, the adhesive sheet winding body (1) is capable of drawing out an adhesive sheet having excellent appearance.

Description

Adhesive sheet winding body {PRESSURE-SENSITIVE ADHESIVE SHEET ROLL}

This invention is equipped with the adhesive layer which has a comparatively thick thickness, and relates to the adhesive sheet winding body suitable for use with a display body (display), for example.

Generally, the thickness of the adhesive layer of an adhesive sheet is adjusted suitably according to the use. For example, as an adhesive sheet used for manufacture of a display using a display module, what has a comparatively thick adhesive layer may be selected. In such a use, an adhesive layer is embedded in the space | gap between the protective panel which comprises the said display, and a display body module from a viewpoint of improving the image quality of a display. Here, as the protective panel, a frame-like printed layer is also present on the display module side. At this time, by using what has a comparatively thick thickness as an adhesive layer, the said adhesive layer is followed suitably to the said step | step, and the problem, such as the reflection loss of the light in the vicinity of a step | step, is suppressed by this.

In addition, Patent Document 1 discloses a double-sided adhesive sheet having an acrylic pressure-sensitive adhesive layer having a thickness of 280 μm or more as a double-sided adhesive sheet for fixing a member constituting a portable electronic device.

Japanese Unexamined Patent Publication No. 2015-147873

By the way, while an adhesive sheet is normally manufactured in the state of elongate, it is wound by a cylindrical or cylindrical core material, and becomes an adhesive sheet winding body. Here, in the adhesive sheet provided with the comparatively thick adhesive layer as mentioned above, when it is set as an adhesive sheet winding body, a visual problem tends to arise. For example, many wrinkles may be generated in the adhesive sheet drawn out from such an adhesive sheet winding body.

This invention is made | formed in view of the above actual conditions, and an object of this invention is to provide the adhesive sheet winding body which can feed out the adhesive sheet which has the outstanding external appearance.

In order to achieve the said objective, First, this invention is laminated | stacked on the surface side opposite to the 1st film, the adhesive layer laminated | stacked on the single side | surface side of the said 1st film, and the said 1st film in the said adhesive layer. A long pressure-sensitive adhesive sheet comprising a second film is a pressure-sensitive adhesive sheet wound body formed by winding a cylindrical or cylindrical core material with the surface on the first film side inward, wherein the pressure-sensitive adhesive layer is an acrylic pressure-sensitive adhesive. It is comprised and the thickness of the said adhesive layer is 100 micrometers or more and 1000 micrometers or less, and satisfy | fills the following conditions A or conditions B, The adhesive sheet winding object is provided (invention 1).

Condition A: In the width direction of the said adhesive layer, the low film thickness part which is 2 micrometers or more thinner than the maximum thickness of the adhesive layer in the said width direction does not exist;

Condition B: The low film thickness part is present only in a region within 10% of the full width from both ends in the width direction of the pressure sensitive adhesive layer, and the sum of the widths of the low film thickness part is 10% of the total width of the pressure sensitive adhesive layer. Is less than

In the adhesive sheet wound body which concerns on the said invention (invention 1), the low-film-thickness part mentioned above does not exist, or the low-film-thickness part mentioned above exists only in the area | region within 10% of the full width from both ends of the width direction of an adhesive layer, respectively. While present, the total of the width is 10% or less of the total width of the pressure-sensitive adhesive layer, whereby a pressure-sensitive adhesive sheet having a good appearance in which generation of wrinkles is suppressed can be fed.

In the said invention (invention 1), it is preferable that at least one of the said 1st film and the said 2nd film is a peeling film (invention 2).

In the said invention (invention 1, 2), it is preferable that the thickness of the said 1st film is the same as the thickness of the said 2nd film, or is thicker than the thickness of the said 2nd film (invention 3).

In the said invention (invention 1-3), it is preferable that the storage elastic modulus at 23 degrees C of the said adhesive layer is 0.001 Mpa or more and 5 Mpa or less (invention 4).

In the said invention (invention 1-4), it is preferable that the gel fraction of the said acrylic adhesive is 30% or more and 80% or less (invention 5).

In the said invention (invention 1-5), it is preferable that the dispersion | variation in the film thickness of the said adhesive layer is less than 2% (invention 6).

In the said invention (invention 1-6), it is preferable that the Young's modulus in 23 degreeC of the said 1st film is 0.01 GPa or more and 20 GPa or less (invention 7).

In the said invention (invention 1-7), it is preferable that the winding number of the said adhesive sheet is three or more rounds (invention 8).

According to the adhesive sheet winding body which concerns on this invention, the adhesive sheet which has the outstanding external appearance can be fed.

1 is a perspective view of an adhesive sheet wound body according to an embodiment of the present invention.
It is sectional drawing of the adhesive sheet which comprises the adhesive sheet winding body which concerns on one Embodiment of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described.

The perspective view of the adhesive sheet winding body which concerns on one Embodiment of this invention is shown in FIG. As shown in FIG. 1, in the adhesive sheet winding body 1 which concerns on this embodiment, the elongate adhesive sheet 10 is wound by the cylindrical or cylindrical core material 20. As shown in FIG.

2, sectional drawing of the adhesive sheet 10 in this embodiment is shown. As shown in FIG. 2, the adhesive sheet 10 in this embodiment has the 1st film 11, the adhesive layer 12 laminated | stacked on the single side | surface side of the 1st film 11, and the adhesive layer ( The 2nd film 13 laminated | stacked on the surface side opposite to the 1st film 11 in 12) is provided.

Here, in the adhesive sheet winding body 1 which concerns on this embodiment, the adhesive sheet 10 is wound by the core material 20 with the surface by the side of the 1st film 11 inside.

In the adhesive sheet winding body 1 which concerns on this embodiment, the thickness of the adhesive layer 12 is 100 micrometers or more and 1000 micrometers or less. And the adhesive sheet winding body 1 which concerns on this embodiment satisfy | fills the following conditions A or conditions B. FIG.

Condition A: In the width direction of the adhesive layer 12, the low film thickness part which is 2 micrometers or more thinner than the maximum thickness of the adhesive layer 12 in the said width direction does not exist.

Condition B: While the said low film thickness part exists only in the area | region within 10% of full width from the both ends of the width direction of the adhesive layer 12, the sum total of the width | variety of the said low film thickness part is the whole of the adhesive layer 12 10% or less of the width.

In the adhesive sheet winding body 1 which concerns on this embodiment, although satisfy | filling the above-mentioned condition A or condition B, although the adhesive layer 12 has thickness which is 100 micrometers or more, the adhesion which generation | occurrence | production of a wrinkle was suppressed The sheet 10 can be fed out. That is, according to the adhesive sheet winding body 1 which concerns on this embodiment, the adhesive sheet which has a favorable external appearance can be fed. In addition, in this specification, the diameter of the core material 20 shall mean the outer diameter of the said cylinder when the core material 20 is cylindrical.

When the low film thickness part mentioned above exists in the area | region exceeding 10% of full width from the both ends of the width direction of the adhesive layer 12, the ratio of the part which the wrinkle in the adhesive layer 12 generate | occur | produced becomes large very much, The external appearance of the adhesive sheet 10 to be taken out becomes unacceptable. From the viewpoint of effectively suppressing the occurrence of wrinkles and allowing the pressure-sensitive adhesive sheet having a better appearance, the region where the low-film thickness portion exists in the case where the low-film thickness portion described above exists is an adhesive layer (12). It is preferable that it is an area within 5% of the full width, and it is especially preferable that it is an area within 4% from both ends of the width direction of the width | variety).

Moreover, even when the sum total of the width | variety of the low film thickness part mentioned above exceeds 10% of the full width of the adhesive layer 12, the ratio of the part which the wrinkle in the adhesive layer 12 generate | occur | produced becomes very large, and is extracted The external appearance of the adhesive sheet 10 becomes unacceptable. From the viewpoint of effectively suppressing the occurrence of wrinkles and allowing the pressure-sensitive adhesive sheet 10 having a better appearance, the sum of the widths of the low-film thickness portions in the case where the low-film thickness portion described above is present is an adhesive. It is preferable that it is 8% or less of the whole width of the layer 12, and it is especially preferable that it is 4% or less.

In addition, in the adhesive sheet winding body 1 which concerns on this embodiment, the length of the part which satisfy | fills the above-mentioned condition A or condition B with respect to the full length (length of the feeding direction) of the adhesive sheet 10 to be fed ( It is preferable that the ratio of the length of an extraction direction) is 50% or more, It is especially preferable that it is 75% or more, Furthermore, it is preferable that it is 100%. When the said ratio is 50% or more, generation | occurrence | production of a wrinkle is suppressed effectively and it becomes easy to feed out the adhesive sheet 10 which has a more favorable external appearance. Moreover, in the adhesive sheet winding body 1 which concerns on this embodiment, the adhesive sheet 10 may be equipped with both the part which satisfy | fills condition A, and the part which satisfy | fills condition B. FIG.

In the present specification, the wrinkles generated in the pressure-sensitive adhesive sheet drawn from the pressure-sensitive adhesive sheet winding body refer to any of the wrinkles generated by deformation of at least a portion of the pressure-sensitive adhesive sheet and the folded wrinkles resulting from bending of the pressure-sensitive adhesive sheet. .

1. Configuration of PSA Sheet Winding Body

(1) pressure-sensitive adhesive layer

The thickness of the adhesive layer 12 in this embodiment is 100 micrometers or more. When the thickness of the adhesive layer 12 is 100 micrometers or more, the adhesive sheet 10 in this embodiment becomes a thing preferable for the use for which the adhesive layer of comparatively thick thickness is calculated | required. From such a viewpoint, it is preferable that the thickness of the adhesive layer 12 is 140 micrometers or more, and it is especially preferable that it is 180 micrometers or more. On the other hand, the upper limit of the thickness of the pressure-sensitive adhesive layer 12 is not particularly limited, but is usually 1000 µm or less, preferably 500 µm or less, particularly preferably 300 µm or less.

It is preferable that the dispersion | variation in the film thickness of the adhesive layer 12 in this embodiment is less than 2%, It is preferable that it is especially 1% or less, Furthermore, it is preferable that it is 0.1% or less. When the variation in the film thickness of the pressure-sensitive adhesive layer 12 is less than 2%, the distinction between the low-film thickness portion and other portions described above becomes clearer, and the pressure-sensitive adhesive layer 12 satisfies the above-described conditions regarding the low-film thickness portion. It becomes easy to do it. In addition, the detail of the measuring method of the said deviation is as having described in the test example mentioned later.

The storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer 12 in the present embodiment is preferably 0.001 MPa or more, more preferably 0.005 MPa or more, and more preferably 0.01 MPa, from the viewpoint of further reducing occurrence of wrinkles. It is preferable that it is above. Moreover, it is preferable that the said storage elastic modulus is 5 Mpa or less, It is more preferable that it is 1 Mpa or less, It is especially preferable that it is 0.5 Mpa or less, Furthermore, it is preferable that it is 0.18 Mpa or less. When the adhesive sheet 10 in this embodiment is affixed on the to-be-adhered body which has a level | step difference on the surface because the upper limit of the storage elastic modulus at 23 degrees C of the adhesive layer 12 is the said below, The adhesive layer 12 follows the step more favorably. In addition, the test method of the said storage elastic modulus is as showing to the test example mentioned later.

The adhesive layer 12 in this embodiment is comprised from the acrylic adhesive. Thereby, the adhesive sheet 10 in this embodiment is easy to exhibit a desired adhesive force. As a specific example of the said acrylic adhesive, it is not limited as long as the adhesive layer 12 can be formed in the thickness mentioned above. Moreover, any of an emulsion type, a solvent type, or a non-solvent type may be sufficient as an acrylic adhesive, and any of a crosslinking type or a non-crosslinking type may be sufficient.

Moreover, an active energy ray curable adhesive may be sufficient as the acrylic adhesive which comprises the adhesive layer 12, and an active energy ray non-curable adhesive may be sufficient as it. When the acrylic pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is an active energy ray-curable pressure-sensitive adhesive, the pressure-sensitive adhesive is already active energy ray-cured in a state in which the pressure-sensitive adhesive sheet wound body 1 in the present embodiment is manufactured. It may be sufficient or it may be a thing which has not hardened active energy ray. Among these, it is preferable that the acrylic adhesive which comprises the adhesive layer 12 in this embodiment is an active-energy-ray-curable adhesive, In particular, the adhesive sheet winding body 1 in this embodiment was manufactured. It is preferable that the active energy ray has not yet been cured in the state. Although such an adhesive is a relatively flexible thing before hardening, even when the adhesive layer 12 consists of such an adhesive and its thickness is comparatively thick, it is the adhesive sheet wound body 1 in this embodiment. According to this, generation of wrinkles can be effectively suppressed. Therefore, the adhesive sheet wound body 1 in this embodiment is still active energy ray in the state in which the adhesive layer 12 is an active energy ray curable adhesive, and the adhesive sheet wound body 1 was manufactured. It is preferable when it is comprised by what is not hardened | cured.

As mentioned above, in the state which the adhesive sheet winding body 1 in this embodiment was manufactured, by using the active-energy-ray-curable acrylic adhesive which is not hardened | cured yet, in this embodiment, The adhesive sheet 10 becomes a suitable part to affix on the to-be-adhered body which has a level | step difference on the surface. That is, the adhesive layer 12 is affixed on a to-be-adhered body in the state which has not hardened | cured by the active energy ray, and the adhesive layer 12 is followed suitably with respect to a level | step, and then hardened | cured an active energy ray, and the adhesive layer 12 ) The cohesion force is sufficiently high. Thereby, even when the adhesive layer 12 after hardening is put on high-temperature, high-humidity conditions in the state affixed on the to-be-adhered body, generation | occurrence | production of foam | bubble, lifting, peeling, etc. in a step vicinity can be suppressed favorably.

Below, the adhesive layer 12 in this embodiment is comprised from the active energy ray hardenable acrylic adhesive, and the said adhesive is a state especially where the adhesive sheet winding body 1 in this embodiment was manufactured. The case where it has not yet hardened | cured active energy ray in the following is demonstrated. Such an adhesive layer 12 is, for example, an adhesive composition containing a (meth) acrylic acid ester copolymer (A), a crosslinking agent (B) and an active energy ray curable component (C) (hereinafter referred to as "adhesive composition P"). May be constituted by an adhesive formed by crosslinking (thermal crosslinking). In addition, it is preferable that the said adhesive composition P contains a photoinitiator (D) further as needed. In addition, in this specification, (meth) acrylic acid means both acrylic acid and methacrylic acid. Other similar terms are also the same. In addition, the "polymer" shall also include the concept of a "copolymer."

(1-1) (meth) acrylic acid ester copolymer (A)

It is preferable that the (meth) acrylic acid ester copolymer (A) contains the reactive group containing monomer which has a reactive group reacting with a crosslinking agent (B) in a molecule | numerator as a monomer unit which comprises the said polymer. Thereby, it becomes possible for the reactive group derived from a reactive group containing monomer to react with a crosslinking agent (B).

As said reactive group containing monomer, the monomer (hydroxyl group containing monomer) which has a hydroxyl group in a molecule | numerator, the monomer (carboxy group containing monomer) which has a carboxyl group in a molecule | numerator, the monomer (amino group containing monomer) which has an amino group in a molecule | numerator, etc. are mentioned preferably. . Among these, the hydroxyl group containing monomer which is excellent in the reactivity with a crosslinking agent (B), and has little bad influence to a to-be-adhered body is especially preferable.

As a hydroxyl-containing monomer, (meth) acrylic-acid 2-hydroxyethyl, (meth) acrylic-acid 2-hydroxypropyl, (meth) acrylic-acid 3-hydroxypropyl, (meth) acrylic acid 2-hydroxybutyl, (Meth) acrylic-acid hydroxyalkyl esters, such as 3-hydroxybutyl (meth) acrylic acid and 4-hydroxybutyl (meth) acrylic acid, etc. are mentioned. Especially, (meth) acrylic acid 2-hydroxyethyl or (meth) acrylic acid 4 from the point of the reactivity with the crosslinking agent (B) of the hydroxyl group in the (meth) acrylic acid ester copolymer (A) obtained, and copolymerizability with another monomer. -Hydroxybutyl is preferred. These may be used independently and may be used in combination of 2 or more type.

It is preferable that a (meth) acrylic acid ester copolymer (A) contains 1 mass% or more of hydroxyl group containing monomers as a lower limit as a monomer unit which comprises the said polymer, It is more preferable to contain 5 mass% or more, Especially It is preferable to contain 10 mass% or more, and also it is preferable to contain 12 mass% or more. Moreover, it is preferable that a (meth) acrylic acid ester copolymer (A) contains 30 mass% or less of hydroxyl group containing monomers as an upper limit, and especially 25 mass% or less as a monomer unit which comprises the said polymer, Furthermore, it is preferable to contain 20 mass% or less.

(Meth) acrylic acid ester copolymer (A) can express preferable adhesiveness by containing the (meth) acrylic-acid alkylester whose C1-C20 alkyl group of an alkyl group is a monomer unit which comprises the said polymer. Examples of the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms of the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and n-butyl (meth) acrylate. N-pentyl acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, n-dodecyl (meth) acrylate, (meth) acrylic acid Myristyl, palmityl (meth) acrylate, stearyl (meth) acrylate, etc. are mentioned. Especially, from a viewpoint of improving adhesiveness further, the (meth) acrylic acid ester of C4-C8 of an alkyl group is preferable, and 2-ethylhexyl (meth) acrylic acid is especially preferable. In addition, these may be used independently and may be used in combination of 2 or more type.

It is preferable that (meth) acrylic acid ester copolymer (A) contains 40 mass% or more of (meth) acrylic-acid alkylesters of 1-20 carbon atoms of an alkyl group as a monomer unit which comprises the said polymer, and especially 50 mass% It is preferable to contain as mentioned above, Furthermore, it is preferable to contain 60 mass% or more. Moreover, it is preferable to contain 90 mass% or less of (meth) acrylic-acid alkylesters with 1-20 carbon atoms of an alkyl group, It is preferable to contain especially 80 mass% or less, Furthermore, it is preferable to contain 70 mass% or less.

It is also preferable that the (meth) acrylic acid ester copolymer (A) contains the monomer (alicyclic structure containing monomer) which has an alicyclic structure in a molecule | numerator as a monomer unit which comprises the said copolymer. Since an alicyclic structure containing monomer is bulky, it exists in the polymer, and it is estimated that the space | interval between polymers is widened, and the adhesive obtained can be made excellent in flexibility. When the (meth) acrylic acid ester copolymer (A) contains an alicyclic structure containing monomer, even when the adhesive sheet 10 in this embodiment is affixed on the to-be-adhered body on a surface, the adhesive layer 12 It can follow suitably the said step at the time of sticking.

The carbon ring of the alicyclic structure in an alicyclic structure containing monomer may be a saturated structure, or may have a unsaturated bond in one part. In addition, the alicyclic structure may be a monocyclic alicyclic structure, or may be a polycyclic alicyclic structure such as two rings or three rings. It is preferable that the said alicyclic structure is polycyclic alicyclic structure (polycyclic structure) from a viewpoint of extending the mutual distance of the obtained (meth) acrylic acid ester copolymer (A), and showing the flexibility of an adhesive effectively. Moreover, in consideration of the compatibility of a (meth) acrylic acid ester copolymer (A) and another component, it is especially preferable that the said polycyclic structure is 2 to 4 rings. In addition, from the viewpoint of effectively exerting the effect of the flexibility of the pressure-sensitive adhesive as described above, the carbon number of the alicyclic structure (it refers to all the carbon number of the portion forming the ring, and when a plurality of rings are independently present, It is preferable that it is five or more normally, and it is especially preferable that it is seven or more. On the other hand, the upper limit of the carbon number of the alicyclic structure is not particularly limited, but is preferably 15 or less, particularly preferably 10 or less from the viewpoint of compatibility as described above.

As an alicyclic structure, for example, a cyclohexyl skeleton, a dicyclopentadiene skeleton, an adamantane skeleton, an isobornyl skeleton, a cycloalkane skeleton (cycloheptane skeleton, cyclooctane skeleton, cyclononane skeleton, cyclodecane skeleton, Cycloundecane skeleton, cyclododecane skeleton, etc.), cycloalkene skeleton (cycloheptene skeleton, cyclooctene skeleton, etc.), norbornene skeleton, norbornadiene skeleton, cuban skeleton, vasketein skeleton, Haussein skeleton, spiro The thing containing a skeleton etc. are mentioned, Especially, the dicyclopentadiene skeleton (C10 of alicyclic structure), Adamantane skeleton (C10 of alicyclic structure) or iso which exhibits more excellent durability is mentioned. It is preferable to contain a bornyl skeleton (carbon number of an alicyclic structure: 7), and it is especially preferable to contain an isobornyl skeleton.

As said alicyclic structure containing monomer, the (meth) acrylic acid ester monomer containing the said skeleton is preferable, Specifically, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, and (meth) acrylic acid Methyl, isobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, dicyclopentenyl oxyethyl (meth) acrylate, and the like, and among them, (meth) acrylate, which exhibits superior durability. Clofentanil, adamantyl (meth) acrylate, or isobornyl (meth) acrylate is preferable, and isobornyl (meth) acrylate is particularly preferable. These may be used individually by 1 type and may be used in combination of 2 or more type.

When (meth) acrylic acid ester copolymer (A) contains an alicyclic structure containing monomer as a monomer unit which comprises the said polymer, (meth) acrylic acid ester copolymer (A) has 3 mass of alicyclic structure containing monomers. It is preferable to contain% or more, It is preferable to contain especially 5 mass% or more, Furthermore, it is preferable to contain 8 mass% or more. Moreover, it is preferable that (meth) acrylic acid ester copolymer (A) contains 35 mass% or less of alicyclic structure containing monomers as a monomer unit which comprises the said polymer, and it is especially preferable to contain 25 mass% or less, Furthermore, it is preferable to contain 15 mass% or less. When content of an alicyclic structure containing monomer exists in the said range, it becomes the thing more excellent in the level | step difference followability of the adhesive obtained.

It is also preferable that the (meth) acrylic acid ester copolymer (A) contains the monomer (nitrogen atom containing monomer) which has a nitrogen atom in a molecule | numerator as a monomer unit which comprises the said copolymer. In addition, the amino group containing monomer illustrated as a reactive group containing monomer shall be remove | excluded from the said nitrogen atom containing monomer. The presence of a nitrogen atom-containing monomer as a structural unit in the polymer promotes the reaction of the acrylate ester copolymer (A) and the crosslinking agent (B), imparts polarity to the pressure sensitive adhesive, and adhesion of the pressure sensitive adhesive to polar surfaces such as glass surfaces. Can increase.

As said nitrogen atom containing monomer, the monomer which has a tertiary amino group, the monomer which has an amide group, the monomer which has a nitrogen containing heterocyclic ring, etc. are mentioned, Especially, the monomer which has a nitrogen containing heterocyclic ring is preferable.

As a monomer which has a nitrogen-containing heterocyclic ring, N- (meth) acryloyl morpholine, N-vinyl-2-pyrrolidone, N- (meth) acryloyl pyrrolidone, N- (meth ) Acryloylpiperidine, N- (meth) acryloylpyrrolidine, N- (meth) acryloylaziridine, aziridinylethyl (meth) acrylate, 2-vinylpyridine, 4-vinylpyridine, 2 -Vinylpyrazine, 1-vinylimidazole, N-vinylcarbazole, N-vinylphthalimide, etc. are mentioned, Especially, in addition to adhesiveness to polar surfaces, such as a glass surface, the cohesion force of the adhesive obtained also improves. N- (meth) acryloyl morpholine is preferable, and N-acryloyl morpholine is preferable from a viewpoint of improving the blister resistance.

Moreover, as nitrogen atom containing monomers other than the monomer which has a nitrogen containing heterocyclic ring mentioned above, it is (meth) acrylamide, N-methyl (meth) acrylamide, N-methylol (meth) acrylamide, N, for example. -tert-butyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-ethyl (meth) acrylamide, N, N-dimethylaminopropyl (meth) acrylamide, N-isopropyl ( (Meth) acrylamide, N-phenyl (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, N-vinyl caprolactam, dimethylaminoethyl (meth) acrylate, etc. can also be used. The above nitrogen atom-containing monomers may be used alone, or may be used in combination of two or more thereof.

When the (meth) acrylic acid ester copolymer (A) contains a nitrogen atom-containing monomer as the monomer unit constituting the polymer, the (meth) acrylic acid ester copolymer (A) is 1% by mass or more of the nitrogen atom-containing monomer It is preferable to contain, It is preferable to contain especially 2 mass% or more, Furthermore, it is preferable to contain 5 mass% or more. Moreover, it is preferable that a (meth) acrylic acid ester copolymer (A) contains 40 mass% or less of nitrogen atom containing monomers as a monomer unit which comprises the said polymer, It is preferable to contain 25 mass% or less especially, Furthermore, It is preferable to contain 15 mass% or less. When content of a nitrogen atom containing monomer exists in said range, the adhesive force to polar surfaces, such as the glass surface of the adhesive obtained, improves effectively.

(Meth) acrylic acid ester copolymer (A) may contain another monomer as a monomer unit which comprises the said polymer as desired. As another monomer, the monomer which does not contain the reactive functional group is preferable. As such another monomer, (meth) acrylic-acid alkoxy alkyl esters, such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, vinyl acetate, styrene, etc. are mentioned, for example. These may be used independently and may be used in combination of 2 or more type.

A random copolymer may be sufficient as the superposition | polymerization aspect of a (meth) acrylic acid ester copolymer (A), and a block copolymer may be sufficient as it.

It is preferable that the weight average molecular weight of a (meth) acrylic acid ester copolymer (A) is 100,000 or more as a lower limit, It is especially preferable that it is 200,000 or more, Furthermore, it is preferable that it is 300,000 or more. If the lower limit of the weight average molecular weight of the (meth) acrylic acid ester copolymer (A) is more than the above-mentioned, the cohesion force of the adhesive obtained can be improved effectively. Moreover, it is preferable that the weight average molecular weight of a (meth) acrylic acid ester copolymer (A) is 1 million or less as an upper limit, It is preferable that it is especially 850,000 or less, Furthermore, it is preferable that it is 700,000 or less. If the upper limit of the weight average molecular weight of a (meth) acrylic acid ester copolymer (A) is below the above, it can suppress that the storage elastic modulus of the adhesive obtained becomes too high. In addition, the weight average molecular weight in this specification is a value of standard polystyrene conversion measured by the gel permeation chromatography (GPC) method.

In addition, in the adhesive composition P, (meth) acrylic acid ester copolymer (A) may be used individually by 1 type, and may be used in combination of 2 or more type.

(1-2) Crosslinking Agent (B)

A crosslinking agent (B) crosslinks a (meth) acrylic acid ester copolymer (A) by the heating of the adhesive composition P, and it becomes possible to form a three-dimensional network structure favorably. Thereby, the cohesion force of the adhesive obtained is improved more, and it becomes easy to adjust a gel fraction and storage elastic modulus to a preferable range.

What is necessary is just to react with the reactive functional group which the (meth) acrylic acid ester copolymer (A) has as said crosslinking agent (B), For example, an isocyanate type crosslinking agent, an epoxy type crosslinking agent, an amine type crosslinking agent, a melamine type crosslinking agent, an aziridine type crosslinking agent , Hydrazine crosslinking agent, aldehyde crosslinking agent, oxazoline crosslinking agent, metal alkoxide crosslinking agent, metal chelate crosslinking agent, metal salt crosslinking agent, ammonium salt crosslinking agent and the like. Here, since it is preferable that (meth) acrylic acid ester copolymer (A) contains a hydroxyl group containing monomer as a structural monomer unit, as an crosslinking agent (B), the isocyanate type crosslinking agent which is excellent in reactivity with a hydroxyl group is used here. It is preferable. In addition, a crosslinking agent (B) can be used individually by 1 type or in combination of 2 or more type.

Isocyanate type crosslinking agent contains a polyisocyanate compound at least. As a polyisocyanate compound, For example, aromatic polyisocyanate, such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate, aliphatic polyisocyanate, such as hexamethylene diisocyanate, isophorone diisocyanate, hydrogenated diphenylmethane Alicyclic polyisocyanates such as diisocyanate and the like and reactants with low molecular weight active hydrogen-containing compounds such as biuret, isocyanurate, and ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane and castor oil. Adduct body etc. are mentioned. Among them, trimethylolpropane-modified aromatic polyisocyanates, especially trimethylolpropane-modified tolylene diisocyanate, are preferable from the viewpoint of reactivity with hydroxyl groups.

It is preferable that content of the crosslinking agent (B) in adhesive composition P is 0.01 mass part or more with respect to 100 mass parts of (meth) acrylic acid ester copolymers (A), It is especially preferable that it is 0.05 mass part or more, Furthermore, 0.1 It is preferable that it is more than a mass part. Moreover, it is preferable that the said content is 3 mass parts or less, It is especially preferable that it is 2 mass parts or less, Furthermore, it is preferable that it is 1 mass part or less. When content of a crosslinking agent (B) exists in the said range, the grade of crosslinking becomes suitable and it becomes easy to adjust the gel fraction and storage elastic modulus of an adhesive layer to a preferable range.

(1-3) Active energy ray curable component (C)

When the adhesive composition P contains an active energy ray curable component (C), the adhesive obtained by crosslinking (thermal crosslinking) the adhesive composition P becomes an active energy ray curable adhesive. This adhesive is an active energy ray curable component (C) superposing | polymerizing with each other by hardening by active energy ray irradiation after adherend adherend, and the polymerized active energy ray curable component (C) is a (meth) acrylic acid ester copolymer It is estimated that it is intertwined with the crosslinked structure (three-dimensional network structure) of (A). Thereby, it becomes easy to raise the gel fraction and storage elastic modulus of the adhesive after hardening favorable. Since the adhesive which has such a higher order structure has high cohesion force and exhibits a high film strength, it becomes more excellent in the step | step traceability under high temperature, high humidity conditions.

The active energy ray curable component (C) is not particularly limited as long as it is a component that is cured by irradiation of an active energy ray and the above effects are obtained, and any of monomers, oligomers, or polymers may be used, or a mixture thereof. Especially, the polyfunctional acrylate type monomer excellent in compatibility with (meth) acrylic acid ester copolymer (A) etc. is mentioned preferably.

As a polyfunctional acrylate type monomer, 1, 4- butanediol di (meth) acrylate, 1, 6- hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, polyethyleneglycol, for example Di (meth) acrylate, neopentyl glycol adipate di (meth) acrylate, hydroxy pivalate neopentyl glycol di (meth) acrylate, dicyclopentanyldi (meth) acrylate, caprolactone modified dicyclopentenyldi (Meth) acrylate, ethylene oxide modified di (meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyldi (meth) acrylate, ethoxylated bisphenol A diacrylate, 9,9 Bifunctional types such as -bis [4- (2-acryloyloxyethoxy) phenyl] fluorene; Trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate, propylene oxide modified trimethylolpropane Trifunctional types such as tri (meth) acrylate, tris (acryloxyethyl) isocyanurate and ε-caprolactone modified tris- (2- (meth) acryloxyethyl) isocyanurate; Tetrafunctional types, such as diglycerin tetra (meth) acrylate and pentaerythritol tetra (meth) acrylate; 5-functional types, such as propionic acid modified dipentaerythritol penta (meth) acrylate; Six functional types, such as dipentaerythritol hexa (meth) acrylate and caprolactone modified dipentaerythritol hexa (meth) acrylate, etc. are mentioned. Among the above-mentioned, from a viewpoint of the level | step difference tracking property under the high temperature, high humidity conditions of the adhesive obtained, di (acryloxyethyl) isocyanurate, tris (acryloxyethyl) isocyanurate, (epsilon) -caprolactone modified tris- (2- (meth The polyfunctional acrylate monomer which contains an isocyanurate structure in molecule | numerators, such as (acryloxyethyl) isocyanurate, is preferable, It is trifunctional or more and polyfunctional acryl which contains an isocyanurate structure in a molecule | numerator. The rate monomer is more preferable, and ε-caprolactone modified tris- (2- (meth) acryloxyethyl) isocyanurate is particularly preferable. These may be used individually by 1 type and may be used in combination of 2 or more type. Moreover, from a compatibility viewpoint with a (meth) acrylic acid ester copolymer (A), the thing of molecular weight less than 1000 is preferable for a polyfunctional acrylate type monomer.

As the active energy ray-curable component (C), an active energy ray-curable acrylate oligomer can also be used. Examples of such acrylate oligomers include polyester acrylates, epoxy acrylates, urethane acrylates, polyether acrylates, polybutadiene acrylates, and silicone acrylates.

It is preferable that it is 50,000 or less, and, as for the weight average molecular weight of the said acrylate oligomer, it is preferable that it is 40,000 or less. Moreover, it is preferable that the said weight average molecular weight is 1,000 or more, and it is especially preferable that it is 3,000 or more. These acrylate oligomers may be used individually by 1 type, or may be used in combination of 2 or more type.

Moreover, as an active energy ray curable component (C), the adduct acrylate type polymer in which the group which has a (meth) acryloyl group was introduce | transduced into the side chain can also be used. Such adduct acrylate polymer is a copolymer of (meth) acrylic acid ester and a monomer having a crosslinkable functional group in a molecule, and a part of the crosslinkable functional group of the copolymer is a (meth) acryloyl group and It can obtain by making the compound which has group which react with a crosslinkable functional group react.

It is preferable that it is 50,000 or more, and, as for the weight average molecular weight of the said adduct acrylate polymer, it is especially preferable that it is 100,000 or more. Moreover, it is preferable that the said weight average molecular weight is 900,000 or less, and it is especially preferable that it is 500,000 or less.

The active energy ray curable component (C) may be selected from one of the above-mentioned polyfunctional acrylate monomers, acrylate oligomers and adduct acrylate polymers, or may be used in combination of two or more thereof. It can also be used in combination with other active energy ray curable components.

Content of the active energy ray curable component (C) in the adhesive composition P improves the cohesion force of the adhesive obtained, raises a gel fraction and storage elastic modulus to a preferable range, and is excellent in the step | step trackability in high temperature, high humidity conditions. It is preferable that it is 1 mass part or more as a lower limit with respect to 100 mass parts of (meth) acrylic acid ester copolymers (A), It is more preferable that it is 3 mass parts or more, It is especially preferable that it is 5 mass parts or more. On the other hand, from the viewpoint of preventing the active energy ray-curable component (C) from being phase separated from the (meth) acrylic acid ester copolymer (A), the content is preferably 50 parts by mass or less as an upper limit, more preferably 20 parts by mass or less. It is preferable that it is preferably 10 parts by mass or less from the viewpoint of further improving the initial step trackability.

(1-4) Photoinitiator (D)

When using an ultraviolet-ray as an active energy ray used for hardening an active energy ray curable adhesive, it is preferable that adhesive composition P contains a photoinitiator (D) further. By containing a photoinitiator (D) in this way, an active energy ray curable component (C) can be superposed | polymerized efficiently and the polymerization curing time and the irradiation amount of an active energy ray can be reduced.

As such a photoinitiator (D), for example, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, Dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1 -Hydroxycyclohexylphenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (Hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiary -Butyl anthraquinone, 2-aminoanthraquinone, 2-methyl thioxanthone, 2-ethyl thioxanthone, 2-chloro thioxanthone, 2,4-dimethyl thioxanthone, 2,4-diethyl thioxanthone , Benzyl dimethyl ketal, acetophenone dimethyl De, p-dimethylaminobenzoic acid ester, oligo [2-hydroxy-2-methyl-1 [4- (1-methylvinyl) phenyl] propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine Oxide and the like. Among these, since a sufficient curing reaction can be performed even beyond the resin plate containing a ultraviolet absorber, it is more preferable to use the photoinitiator of a phosphine oxide type, For example, 2,4,6-trimethylbenzoyl Particular preference is given to using diphenyl-phosphine oxide. These may be used independently and may be used in combination of 2 or more type.

It is preferable that it is 0.1 mass part or more as a lower limit with respect to 100 mass parts of active energy ray curable components (C), and, as for content of the photoinitiator (D) in adhesive composition P, it is especially preferable that it is 1 mass part or more. Moreover, it is preferable that it is 30 mass parts or less as an upper limit, and it is especially preferable that it is 15 mass parts or less.

(1-5) various additives

To the adhesive composition P, various additives normally used for acrylic adhesives, for example, a silane coupling agent, an ultraviolet absorber, an antistatic agent, a tackifier, antioxidant, a light stabilizer, a softener, a filler, a refractive index adjuster, etc. are added to it as desired. can do. In addition, the polymerization solvent and dilution solvent mentioned later shall not be included in the additive which comprises the adhesive composition P. FIG.

Here, when adhesive composition P contains a silane coupling agent, the adhesive obtained will improve adhesiveness with a glass member or a plastic plate.

As a silane coupling agent, as an organosilicon compound which has at least one alkoxysilyl group in a molecule | numerator, compatibility with (meth) acrylic acid ester copolymer (A) is good and it is preferable to have a light transmittance.

Examples of such silane coupling agents include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, and 3-glycidoxypropyltrimethoxy. Silicon compounds having an epoxy structure such as silane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mer Mercapto group-containing silicon compounds such as captopropyldimethoxymethylsilane, 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) Amino group-containing silicon compounds such as -3-aminopropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, or at least one of these, methyltriethoxysilane and ethyltrie Methoxysilane, methyltrimethoxysil The condensate of alkyl group containing silicon compounds, such as a column and ethyl trimethoxysilane, etc. are mentioned. Among these, 3-glycidoxy propyl trimethoxysilane is preferable from a viewpoint which can improve the adhesiveness of the adhesive layer 12, a glass member, and a plastic plate effectively. These may be used individually by 1 type and may be used in combination of 2 or more type.

When the adhesive composition P contains a silane coupling agent, the content thereof is preferably 0.01 parts by mass or more, particularly preferably 0.05 parts by mass or more, based on 100 parts by mass of the (meth) acrylic acid ester copolymer (A). It is preferable that it is 0.1 mass part or more. Moreover, it is preferable that the said content is 2 mass parts or less, It is preferable that it is especially 1 mass part or less, Furthermore, it is preferable that it is 0.5 mass part or less.

(1-6) Gel fraction

In the adhesive sheet winding body 1 which concerns on this embodiment, it is preferable that the gel fraction of the acrylic adhesive which comprises the adhesive layer 12 is 30% or more, It is more preferable that it is 40% or more, It is especially preferable that it is 45% or more Do. Here, when the adhesive layer 12 is active energy ray curable, a gel fraction here means the gel fraction before irradiating an active energy ray with respect to the said adhesive layer 12. As shown in FIG. If the lower limit of the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is the above, the cohesive force of the pressure-sensitive adhesive becomes high, and the step tracking ability under high temperature and high humidity conditions becomes more excellent. In particular, when the pressure-sensitive adhesive layer 12 is active energy ray curable, the pressure-sensitive adhesive layer 12 is cured by active energy ray irradiation, and the cohesion force is higher, so that the step tracking ability under high temperature and high humidity conditions is further excellent. .

Moreover, it is preferable that the gel fraction of the acrylic adhesive which comprises the adhesive layer 12 is 80% or less, It is especially preferable that it is 70% or less, Furthermore, it is preferable that it is 60% or less. If the upper limit of a gel fraction is the above, an adhesive will not become hard too much and it will become more excellent in an initial stage followability. Here, the measuring method of the gel fraction of an acrylic adhesive (before active energy ray irradiation) is as showing to the test example mentioned later.

In the adhesive sheet winding body 1 which concerns on this embodiment, when the adhesive layer 12 is active energy ray curable, the gel fraction of the acrylic adhesive which hardens the adhesive layer 12 by irradiation of an active energy ray is 40 It is preferable that it is% or more, It is especially preferable that it is 55% or more, Furthermore, it is preferable that it is 65% or more. The gel fraction of the acrylic pressure-sensitive adhesive after curing is higher than the gel fraction before curing. Therefore, when the lower limit of the gel fraction after curing is the above, the step tracking ability under high temperature and high humidity conditions becomes more excellent.

Moreover, when the adhesive layer 12 is active energy ray curable, it is preferable that the gel fraction of the acrylic adhesive which hardens the adhesive layer 12 by irradiation of an active energy ray is 90% or less, especially 80% It is preferable that it is the following, Furthermore, it is preferable that it is 70% or less. If the upper limit of the gel fraction after hardening is the above, the adhesive force of the adhesive layer 12 after hardening may fall, and durability can be prevented from deteriorating. The measuring method of the gel fraction of the acrylic adhesive (after active energy ray irradiation) after hardening mentioned above is as showing to the test example mentioned later.

Moreover, compared with the gel fraction before active energy ray hardening of the adhesive layer 12 in the case where the adhesive layer 12 is active energy ray curable, the gel fraction after active energy ray hardening is durable conditions by cohesion force improvement. From the standpoint of securing the step-following ability under the following, it is preferable to be raised by 5 points or more, particularly preferably by 10 points or more, and more preferably by 15 points or more. In addition, from the viewpoint of securing the adhesive strength after active energy ray curing and securing the step trackability under the durable conditions, it is preferable that the increase in the gel fraction described above is suppressed to 35 points or less, particularly preferably to 30 points or less. Furthermore, it is preferable to be suppressed to 25 points or less.

(1-7) Preparation of Adhesive Composition

Adhesive composition P manufactures a (meth) acrylic acid ester copolymer (A), obtains the (meth) acrylic acid ester copolymer (A), and, if desired, a crosslinking agent (B) and an active energy ray curable component (C). It can manufacture by mixing a photoinitiator (D) and an additive.

A (meth) acrylic acid ester copolymer (A) can be manufactured by superposing | polymerizing the mixture of the monomer which comprises a polymer by a normal radical polymerization method. It is preferable to perform superposition | polymerization of a (meth) acrylic acid ester copolymer (A) by solution polymerization method using a polymerization initiator as needed. As a polymerization solvent, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone etc. are mentioned, for example, You may use two or more types together.

As a polymerization initiator, an azo compound, an organic peroxide, etc. are mentioned, You may use two or more types together. Examples of the azo compound include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), and 1,1'-azobis (cyclohexane 1-). Carbonitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl2,2 ' -Azobis (2-methylpropionate), 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2-hydroxymethylpropionitrile), 2,2 ' -Azobis [2- (2-imidazolin-2-yl) propane] etc. are mentioned.

Examples of the organic peroxide include benzoyl peroxide, t-butylperbenzoate, cumene hydroperoxide, diisopropylperoxydicarbonate, di-n-propylperoxydicarbonate, di (2-ethoxyethyl) peroxydi Carbonate, t-butyl peroxy neodecanoate, t-butyl peroxy pivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide and the like.

Moreover, in the said superposition | polymerization process, the weight average molecular weight of the polymer obtained can be adjusted by mix | blending chain transfer agents, such as 2-mercaptoethanol.

When the (meth) acrylic acid ester copolymer (A) is obtained, a crosslinking agent (B), an active energy ray curable component (C), and a photoinitiator (as desired) are added to the solution of the (meth) acrylic acid ester copolymer (A). By adding D), an additive, and a diluting solvent, and fully mixing, the adhesive composition P (coating solution) diluted with the solvent can be obtained. In addition, in any of the above components, when a solid phase is used or when precipitation occurs when mixed with other components in an undiluted state, the components are dissolved or diluted in advance in a dilution solvent alone. After making it mix, you may mix with another component.

Examples of the diluting solvent include aliphatic hydrocarbons such as hexane, heptane and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, methanol, ethanol, propanol, butanol, and 1- Cellosolve solvents such as alcohols such as methoxy-2-propanol, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone, esters such as ethyl acetate and butyl acetate, and ethyl cellosolve Etc. are used.

The concentration and viscosity of the coating solution prepared in this way may be in a range that can be coated, and is not particularly limited and can be appropriately selected according to the situation. For example, it dilutes so that the density | concentration of adhesive composition P may be 10-60 mass%. In addition, when obtaining a coating solution, addition of a dilution solvent etc. is not a requirement, and if the adhesive composition P is a viscosity etc. which can be coated, it is not necessary to add a dilution solvent. In this case, the adhesive composition P becomes a coating solution which uses the polymerization solvent of a (meth) acrylic acid ester copolymer (A) as a dilution solvent as it is.

(2) the first film

The 1st film 11 may be a desired base material affixed on a to-be-adhered body via the adhesive layer 12, and the peeling sheet as mentioned later may be sufficient. The material of the first film 11 is not particularly limited. The 1st film 11 may be comprised with the resin sheet which has a resin material as a main component, and may be comprised with the material of paper system.

As resin components related to the resin sheet, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, ethylene-norbornene copolymer, polyolefin such as norbornene resin, polyethylene terephthalate, polyethylene naphthalate, poly Resin, such as polyester, such as butylene terephthalate, a polyvinyl chloride, a vinyl chloride copolymer, a polyimide, a polyetherimide, a polycarbonate, polyphenylene sulfide, a liquid crystal polymer, is mentioned. These resin sheets may be sheets consisting of a single layer, or may be sheets obtained by laminating a plurality of layers of the same kind or different kinds. Among the above, a polyethylene terephthalate film is preferable.

Specific examples of the case where the first film 11 is made of a paper-based material include paper substrates such as glassine paper, coated paper, and high-quality paper, and laminated papers laminated with thermoplastic resin such as polyethylene on the paper substrate. Can be.

It is preferable that the 1st film 11 is a peeling sheet in which peeling process is given to the single side | surface (especially the surface which contact | connects the adhesive layer 12) of the sheet | seat which consists of the resin sheet or paper type material mentioned above. As a peeling agent used for a peeling process, alkyd type, silicone type, fluorine type, unsaturated polyester type, polyolefin type, wax type peeling agent is mentioned, for example.

From the viewpoint of further suppressing the occurrence of wrinkles, the thickness of the first film 11 in the present embodiment is preferably 50 μm or more, particularly preferably 75 μm or more, and further preferably 125 μm or more. Moreover, it is preferable that the thickness of the 1st film 11 is 1000 micrometers or less, It is preferable that it is especially 500 micrometers or less, Furthermore, it is preferable that it is 250 micrometers or less. When the upper limit of the thickness of the 1st film 11 is below the above, the adhesive sheet 10 becomes the thing excellent in the winding property.

Moreover, the 1st film 11 may have the same thickness as the 2nd film 13. Alternatively, the first film 11 may have a thickness thicker than the second film 13. In particular, when the first film 11 has a thickness thicker than the second film 13, it becomes possible to feed the pressure-sensitive adhesive sheet 10 in which generation of wrinkles is effectively suppressed.

It is preferable that the Young's modulus at 23 degrees C of the 1st film 11 is 0.01 GPa or more, It is especially preferable that it is 0.1 GPa or more, Furthermore, it is preferable that it is 1 GPa or more. Moreover, it is preferable that the said Young's modulus is 20 GPa or less, It is especially preferable that it is 10 GPa or less, Furthermore, it is preferable that it is 8 GPa or less. When the Young's modulus at 23 degrees C of the 1st film 11 is 0.01 GPa or more, the 1st film 11 will have predetermined intensity | strength, and the adhesive layer 12 satisfy | fills the conditions mentioned above regarding the low film thickness part. It becomes easy to do it. Moreover, when the Young's modulus at 23 degrees C of the 1st film 11 is 20 GPa or less, it becomes suppressed that the 1st film 11 has excessive rigidity, and it becomes easy to wind the adhesive sheet 10, and At the same time, the adhesive sheet 10 becomes more excellent in handleability. In addition, the said Young's modulus is measured based on JISK7161: 2014, The detail of the measuring method is as having described in the test example mentioned later.

(3) second film

The 2nd film 13 may be a desired base material affixed on a to-be-adhered body via the adhesive layer 12, and the peeling sheet as mentioned later may be sufficient. The material constituting the second film 13 may be the same as the first film 11. Moreover, when the 2nd film 13 turns into a peeling sheet, the structure similar to the 1st film 11 as a peeling sheet may be sufficient.

It is preferable that the thickness of the 2nd film 13 is 2 micrometers or more, It is preferable that it is especially 5 micrometers or more, Furthermore, it is preferable that it is 25 micrometers or more. Moreover, it is preferable that the thickness of the 2nd film 13 is 200 micrometers or less, It is more preferable that it is 150 micrometers or less, It is especially preferable that it is 90 micrometers or less, Furthermore, it is preferable that it is 60 micrometers or less. When the thickness of the 2nd film 13 is the range mentioned above, the adhesive sheet 10 will become the thing excellent in handleability.

It is preferable that the Young's modulus at 23 degrees C of the 2nd film 13 is 0.01 GPa or more, It is preferable that it is especially 0.1 GPa or more, Furthermore, it is preferable that it is 1 GPa or more. Moreover, it is preferable that the said Young's modulus is 10 GPa or less, It is especially preferable that it is 8 GPa or less, Furthermore, it is preferable that it is 5 GPa or less. When the Young's modulus at 23 degrees C of the 2nd film 13 is 0.01 GPa or more, the 2nd film 13 will have predetermined intensity | strength, and when the 2nd film 13 is a peeling sheet, When peeling the said 2nd film 13 from the adhesive layer 12, it becomes easy to peel. Moreover, when the Young's modulus at 23 degrees C of the 2nd film 13 is 10 GPa or less, it becomes suppressed that the 2nd film 13 has excessive rigidity, and it is effective to suppress generation | occurrence | production of the wrinkle by winding. It becomes possible. In addition, the said Young's modulus is measured based on JISK7161: 2014, The detail of the measuring method is as having described in the test example mentioned later.

(4) heartwood

The core material 20 in this embodiment has a cylindrical shape or a cylindrical shape. It is preferable that the diameter of the core material 20 in this embodiment is 9 cm or more, It is preferable that it is especially 10 cm or more, Furthermore, it is preferable that it is 15 cm or more. When the diameter of the core material 20 is 9 cm or more, the adhesive layer 12 will be easy to satisfy the above-mentioned conditions regarding a low film thickness part. Moreover, it is preferable that the diameter of the core material 20 is 100 cm or less, It is especially preferable that it is 50 cm or less, Furthermore, it is preferable that it is 40 cm or less. When the diameter of the core material 20 is 100 cm or less, it becomes easy to increase the winding number of the adhesive sheet 10 sufficiently.

Moreover, the length (length in the rotation axis direction when winding the adhesive sheet 10) of the core material 20 in the present embodiment is not particularly limited, but is the same as or equal to the width of the adhesive sheet 10, or It is preferred to be larger than the width.

The material constituting the core material 20 is not particularly limited as long as it has sufficient strength for winding the adhesive sheet 10, and conventionally known materials can be used. As an example of the said material, a metal, resin, a wood, etc. are mentioned, for example. Among these materials, resins are preferable, and polypropylene is particularly preferable.

It is preferable that the Young's modulus at 23 degrees C of the core material 20 is 0.1 GPa or more, It is especially preferable that it is 0.2 GPa or more, Furthermore, it is preferable that it is 0.5 GPa or more. Moreover, it is preferable that the said Young's modulus is 500 GPa or less, It is more preferable that it is 250 GPa or less, It is especially preferable that it is 200 GPa or less, Furthermore, it is preferable that it is 1 GPa or less. Since the Young's modulus at 23 degrees C of the core material 20 is the said range, even when the winding pressure of the adhesive sheet 10 is applied to the core material 20, the shape of the core material 20 can be kept favorable. Become. In addition, the Young's modulus at 23 degrees C of the core material 20 mentioned above shall say what was measured based on JISZ2241: 2011.

(5) other

The length of the adhesive sheet 10 (the length in the feeding direction when feeding the adhesive sheet 10 from the adhesive sheet wound body 1) may be 1 m or more, in particular 200 m or more. When the PSA sheet 10 has a length of 1 m or more, it has been found by the present inventors that the aforementioned wrinkles are likely to occur. However, according to the adhesive sheet winding body 1 which concerns on this embodiment, even in such a case, generation | occurrence | production of the said wrinkle can be suppressed effectively. Moreover, it does not specifically limit about the upper limit of the length of the adhesive sheet 10, It can set to a required length, also considering the handleability of the adhesive sheet winding body 1.

In the adhesive sheet winding body 1 which concerns on this embodiment, 3 turns or more may be sufficient as the adhesive sheet 10, and especially 10 or more turns may be sufficient. When the number of turns becomes three or more turns, it was found by the present inventors that the adhesive sheet 10 drawn out from the adhesive sheet wound body 1 tends to have wrinkles. However, according to the adhesive sheet winding body 1 which concerns on this embodiment, even if a winding number becomes three or more rounds, generation | occurrence | production of the above-mentioned wrinkle can be suppressed effectively. In addition, the upper limit of the said winding number is not specifically limited, It can set suitably from a viewpoint of the handleability of the length and quantity of the adhesive sheet 10 required, and the adhesive sheet winding body 1 which are needed.

2. Manufacturing method of adhesive sheet winding object

It does not specifically limit as a manufacturing method of the adhesive sheet winding body 1 which concerns on this embodiment as long as it can form the adhesive layer 12 which satisfy | fills the conditions with respect to the low film thickness part mentioned above, A conventionally well-known method It can be adopted.

First, as a manufacturing method of the adhesive sheet 10 in this embodiment, for example, at first, to the single side | surface (the surface in which the said peeling process was carried out when peeling-processed) of the 1st film 11, The coating solution of the above-mentioned adhesive composition P is apply | coated. The obtained coating film is heat-processed, and the adhesive composition P is thermally crosslinked, and the adhesive layer 12 is formed. Subsequently, by laminating the single side (the peeled surface when the peeling treatment is performed) of the second film 13 on the surface on the side opposite to the first film 11 in the pressure-sensitive adhesive layer 12. And the adhesive sheet 10 can be formed. As necessary, curing of the pressure-sensitive adhesive layer 12 may be performed. In this manufacturing method, the first film 11 and the second film 13 may be replaced with each other.

As a method of apply | coating the coating solution of the said adhesive composition P, the bar coat method, the knife coat method, the roll coat method, the blade coat method, the die coat method, the gravure coat method, etc. can be used, for example. When manufacturing the adhesive sheet 10 in this embodiment especially, while selecting the coater used for application | coating of the application | coating solution mentioned above suitably, a coating speed, a position of a coater, and the 1st film 11 By adjusting a relationship (angle or distance) etc. suitably, it becomes easy to form the adhesive layer 12 which does not have a low film thickness part, or the adhesive layer 12 which has a low film thickness part on condition mentioned above. Examples of preferred coaters include slot die coaters, lip coaters, roll knife coaters, curtain coaters, and the like, with slot die coaters being preferred. When using a slot die coater, it becomes easy to form the adhesive layer 12 which satisfy | fills the conditions regarding the low film thickness part mentioned above by adjusting a slot gap suitably.

Moreover, when it is difficult to form the adhesive layer 12 which has a desired thickness by one application | coating of a coating solution as mentioned above, the laminated body which forms an adhesive layer on a process sheet is produced, It has desired thickness by bonding together the surface of the adhesive layer side in the said laminated body, and the surface of the adhesive layer side in the laminated body of the 1st film 11 produced as mentioned above, and an adhesive layer. You may form the adhesive layer 12. In this case, the adhesive sheet 10 can be obtained by bonding the 2nd film 13 to the exposed surface of the adhesive layer 12 which peeled the said process sheet and exposed. Or the laminated body which forms an adhesive layer in the single side | surface (if peel-processed, the said peeling process is carried out) of the 2nd film 13 is produced, The surface of the adhesive layer side in the said laminated body, and the said By bonding together the 1st film 11 produced as mentioned above and the surface of the adhesive layer side in the laminated body of an adhesive layer, the adhesive layer 12 which has a desired thickness is formed, and the 1st film 11 is carried out. You may obtain the adhesive sheet 10 in which the adhesive layer 12 and the 2nd film 13 are laminated | stacked in order.

As described above, the laminate of the first film 11 and the pressure-sensitive adhesive layer, the lamination of the second film 13, the first film 11, and the laminate of the second film 13 and the pressure-sensitive adhesive layer. At least one of the 1st film 11 and the 2nd film 13 at the time of lamination or lamination | stacking of the laminated body of the 1st film 11 and an adhesive layer, and the laminated body of the 2nd film 13 and an adhesive layer. You may apply tension to the.

When tension is applied to the first film 11, the tension is preferably 10 N / m or more, particularly preferably 50 N / m or more, and further preferably 100 N / m or more. Moreover, it is preferable that the said tension is 1000 N / m or less, It is especially preferable that it is 800 N / m or less, Furthermore, it is preferable that it is 500 N / m or less.

Moreover, when tension is applied to the 2nd film 13, it is preferable that the said tension is 1 N / m or more, It is especially preferable that it is 10 N / m or more, Furthermore, it is preferable that it is 50 N / m or more. Moreover, it is preferable that the said tension is 800 N / m or less, It is preferable that it is especially 600 N / m or less, Furthermore, it is preferable that it is 400 N / m or less.

In the case where tension is applied to both the first film 11 and the second film 13, a larger tension is applied to the first film 11 that is inward when the adhesive sheet 10 is wound. It is preferable. Thereby, in the adhesive sheet 10 after releasing from tension, the curvature which makes the 1st film 11 side inward tends to arise, and as a result, the adhesive sheet extracted from the adhesive sheet winding body 1 The occurrence of wrinkles in (10) can be suppressed more effectively. From such a viewpoint, the ratio of the tension applied to the first film 11 to the tension applied to the second film 13 is preferably 1.0 times or more, and particularly preferably 1.2 times or more, Furthermore, it is preferable to make 1.8 times or more. The upper limit of the ratio is not particularly limited, but is about 5 times or less.

The adhesive sheet wound body 1 is obtained by winding the adhesive sheet 10 manufactured as mentioned above to the core material 20. In the said winding, the adhesive sheet 10 is wound by the core material 20 so that the surface by the side of the 1st film 11 of the adhesive sheet 10 may become inner side. In addition, you may perform manufacture of the adhesive sheet 10 and the winding of the manufactured adhesive sheet 10 continuously. That is, while laminating | stacking the 1st film 11, the adhesive layer 12, and the 2nd film 13 in the upstream of a flow direction, lamination | stacking is obtained and obtained downstream in a flow direction. You may wind up the adhesive sheet 10.

At the time of winding mentioned above, you may apply tension with respect to the adhesive sheet 10. It is preferable that the said tension is 10 N / m or more, It is especially preferable that it is 50 N / m or more, Furthermore, it is preferable that it is 100 N / m or more. Moreover, it is preferable that the said tension is 1000 N / m or less, It is especially preferable that it is 800 N / m or less, Furthermore, it is preferable that it is 500 N / m or less. By winding the adhesive sheet 10 while applying the tension in the above-mentioned range, it becomes easy to manufacture the adhesive sheet wound body 1 which was rolled up uniformly without looseness.

3. Usage method of adhesive sheet winding body

The adhesive sheet wound body 1 which concerns on this embodiment can use the extracted adhesive sheet 10 for a desired use. In the adhesive sheet winding body 1 which concerns on this embodiment, the adhesive layer 12 has a comparatively thick thickness of 100 micrometers or more. Therefore, it is preferable to use the adhesive sheet 10 in this embodiment for the use which such a comparatively thick adhesive layer 12 is used.

As an example of the preferable use of the adhesive sheet 10 in this embodiment, the case where a display body is manufactured using the adhesive sheet 10 is mentioned. For example, the said display body is this embodiment which is located between the 1st display component structural member which has a level | step difference at least on the surface of the side bonded together, and the 2nd display body structural member (other display body structural member). It is comprised including what hardened | cured the adhesive layer 12 in an aspect. Here, the said step | step is a level | step difference by the printing layer of a frame view in plan view formed in the said surface of the 1st display body structural member, for example.

When manufacturing the said display body, first, any one of the 1st film 11 and the 2nd film 13 is peeled from the adhesive sheet 10 in this embodiment, and the exposed adhesive layer 12 of An adhesive face is affixed on the surface in which the step | step in a 1st display body structural member exists. At this time, the adhesive layer 12 is affixed so that the said step may follow suitably. Next, the remaining one of the 1st film 11 and the 2nd film 13 is peeled from the adhesive layer 12, and the adhesive face of the exposed adhesive layer 12 and the 2nd display body structural member are bonded together. And when the adhesive layer 12 is comprised from the active energy ray hardenable acrylic adhesive as mentioned above, and is not yet hardened | cured by active energy ray, a 1st display member structural member and a 2nd display body An active energy ray is irradiated to the adhesive layer 12 through at least one of a structural member, and the said adhesive layer 12 is hardened. The display body can be obtained by the above.

The first display member may be a plastic plate, a glass plate, or the like having a frame-like printing layer in plan view, or may be a protective panel made of a laminate including such a glass plate, a plastic plate, or the like. The second display member may be an optical member to be attached to the first display member, a display module, an optical member as part of the display module, or a laminate including the display module.

The active energy ray irradiated to the adhesive layer 12 has both energy in an electromagnetic wave or a charged particle beam, and an ultraviolet-ray, an electron beam, etc. are mentioned specifically ,. Among the active energy rays, ultraviolet rays which are easy to handle are particularly preferable.

Irradiation of the said ultraviolet-ray can be performed by a high pressure mercury lamp, a fusion H lamp, a xenon lamp, etc., It is preferable that the irradiation amount of an ultraviolet-ray is 50 dl / cm <2> or more and 1000 dl / cm <2> or less. It is preferable that the light quantity of an ultraviolet-ray is 50 mJ / cm <2> or more, It is more preferable that it is 80 mJ / cm <2> or more, It is especially preferable that it is 200 mJ / cm <2> or more. Moreover, it is preferable that the light quantity of an ultraviolet-ray is 10000 mJ / cm <2> or less, It is more preferable that it is 5000 mJ / cm <2> or less, It is especially preferable that it is 2000 mJ / cm <2> or less. On the other hand, irradiation of an electron beam can be performed by an electron beam accelerator etc., and the irradiation amount of an electron beam is 10 krad or more and 1000 krad or less are preferable.

As mentioned above, after affixing the adhesive layer 12 which consists of an active energy ray curable acrylic adhesive to the 1st display structure member which has a level | step difference, an active energy ray is irradiated and the said adhesive layer 12 is made into When it hardens | cures, the cohesion force of the adhesive layer 12 improves in the state which the adhesive layer 12 followed suitably with respect to a level | step difference. Thereby, even if the said adhesive layer 12 is set to high-temperature, high-humidity conditions in the state affixed on the to-be-adhered body, it becomes possible to suppress generation | occurrence | production of foam | bubble, lifting, peeling, etc. in a step vicinity vicinity.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

Example

Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples.

Example 1

1. Preparation of (meth) acrylic acid ester copolymer (A)

65 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of 4-acryloyl morpholine (N-acryloyl morpholine), 10 parts by mass of isobornyl acrylate and 15 parts by mass of 2-hydroxyethyl acrylate in the solution polymerization method Copolymerization was carried out to prepare a (meth) acrylic acid ester copolymer (A). The molecular weight of this (meth) acrylic acid ester copolymer (A) was measured by the method of mentioning later, and the weight average molecular weight (Mw) was 600,000.

Here, the weight average molecular weight (Mw) mentioned above is the weight average molecular weight of polystyrene conversion measured (GPC measurement) on condition of the following using gel permeation chromatography (GPC).

<Measurement conditions>

GPC measuring device: manufactured by Tosoh Corporation, HLC-8020

GPC column (passed in the following order): manufactured by Tosoh Corporation

  TSK guard column HXL-H

  TSK gel GMHXL (× 2)

  TSK gel G2000HXL

Measurement solvent: tetrahydrofuran

Measurement temperature: 40 ℃

2. Preparation of Adhesive Composition

100 parts by mass of the (meth) acrylic acid ester copolymer (A) obtained in the above step 1 (in terms of solid content; the same below), 0.15 parts by mass of trimethylolpropane-modified tolylene diisocyanate as the crosslinking agent (B), and an active energy ray curable component 5.0 mass parts of (epsilon) -caprolactone modified tris- (2-acryloxyethyl) isocyanurate as (C), and 2,4,6- trimethylbenzoyl- diphenyl- phosphine oxide 0.5 as a photoinitiator (D). The coating solution of the adhesive composition was obtained by mixing a mass part and 0.5 mass part of 3-glycidoxy propyl trimethoxysilane as a silane coupling agent, stirring it sufficiently and diluting with methyl ethyl ketone.

3. Preparation of Adhesive Sheet

The slot die coater is used for the peeling process surface of the peeling sheet (thickness: 75 micrometers) which peeled the coating solution of the adhesive composition obtained at the said process 2 with the silicone type release agent to the single side | surface of the elongate polyethylene terephthalate film as a 1st film. And applied. And the obtained coating film was dried by heat-processing at 110 degreeC for 3 minutes, and the adhesive layer of thickness 100micrometer and width 1080mm was formed. In addition, at the time of application | coating using a slot die coater, the adhesive layer in the adhesive sheet finally obtained was made to have a low film thickness part shown in Table 1 by adjusting a slot gap. This obtained the 1st laminated body which consists of a structure of a 1st film / adhesive layer (thickness: 100 micrometers, width: 1080 mm).

Moreover, the peeling process surface of the peeling sheet (The Lintec company make, product name "SP-PET752150") which peeled-processed the single side | surface of the elongate polyethylene terephthalate film as a process sheet with the coating solution of the adhesive composition obtained at the said process 2 as a process sheet. Was applied using a slot die coater. And the obtained coating film was dried by heat-processing at 110 degreeC for 3 minutes, and the adhesive layer of thickness 100micrometer and width 1080mm was formed. In addition, at the time of application | coating using a slot die coater, the adhesive layer in the adhesive sheet finally obtained was made to have a low film thickness part shown in Table 1 by adjusting a slot gap. Thereby, the 2nd laminated body which consists of a structure of a process sheet / adhesive layer (thickness: 100 micrometers, width: 1080 mm) was obtained.

Subsequently, the surface of the adhesive layer side in the 1st laminated body obtained as mentioned above and the surface of the adhesive layer side in the 2nd laminated body obtained as mentioned above were bonded together. This obtained the 3rd laminated body which consists of a structure of a 1st film / adhesive layer (thickness: 200 micrometers, width: 1080 mm) / process sheet.

Next, peeling which peeled the single side | surface of the elongate polyethylene terephthalate film as a 2nd film with the silicone type peeling agent with respect to the exposed surface of the adhesive layer exposed by peeling a process sheet from the 3rd laminated body obtained as mentioned above and exposing. The peeling process surface of the sheet (thickness: 75 micrometers) was laminated | stacked. In this lamination, a tension of 300 N / m was applied to the first film in the longitudinal direction, and a tension of 150 N / m was applied to the second film in the longitudinal direction. This obtained the adhesive sheet which consists of a structure of a 1st film / adhesive layer (thickness: 200 micrometers, width: 1080 mm) / 2nd film.

Moreover, it was less than 0.1% when the dispersion | variation in the film thickness of the adhesive layer in the adhesive sheet manufactured as mentioned above was measured by the method mentioned later.

4. Manufacture of adhesive sheet winding body

The adhesive sheet obtained at the said process 3 was wound up to the cylindrical core material (made of polypropylene, Young's modulus: 0.7 kPa) which has a diameter (outer diameter) of 179.4 mm. At this time, while winding so that a 1st film side in an adhesive sheet might become inner side, it wound while applying a tension | tensile_strength of 200 N / m to a longitudinal direction to the adhesive sheet. Moreover, the length of the wound adhesive sheet was 300 m. This obtained the adhesive sheet winding object.

Example 2

When manufacturing a 1st laminated body and a 2nd laminated body, by adjusting the slot gap of a slot die coater, it implemented except having changed so that the adhesive layer in the adhesive sheet finally obtained may have a low film thickness part shown in Table 1. In the same manner as in Example 1, an adhesive sheet wound body was produced.

Example 3

As a 1st film, while using the peeling sheet (thickness: 125 micrometers) which peeled the single side | surface of a long polyethylene terephthalate film with the silicone type peeling agent, the slot of a slot die coater at the time of producing a 1st laminated body and a 2nd laminated body By adjusting the gap, a pressure-sensitive adhesive sheet wound body was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer in the pressure-sensitive adhesive sheet finally obtained had a low film thickness portion shown in Table 1.

Example 4

55 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of 4-acryloyl morpholine (N-acryloyl morpholine), 10 parts by mass of isobornyl acrylate and 25 parts by mass of 2-hydroxyethyl acrylate in the solution polymerization method Copolymerization was carried out to prepare a (meth) acrylic acid ester copolymer (A). When the molecular weight of this (meth) acrylic acid ester copolymer (A) was measured by the above-mentioned method, it was 600,000 in weight average molecular weights (Mw). When preparing the coating solution of an adhesive composition using this (meth) acrylic acid ester copolymer (A), forming an adhesive layer using this coating solution, and producing a 1st laminated body and a 2nd laminated body, By adjusting the slot gap of a die coater, the adhesive sheet winding body was produced like Example 1 except having changed so that the adhesive layer in the adhesive sheet finally obtained may have a low film thickness part shown in Table 1. .

Example 5

By using the cylindrical core material (made of polypropylene, Young's modulus: 0.7 kPa) which has a diameter (outer diameter) of 331.8 mm, and adjusting the slot gap of a slot die coater when manufacturing a 1st laminated body and a 2nd laminated body, The adhesive sheet wound body was produced like Example 1 except having changed so that the adhesive layer in the adhesive sheet finally obtained may not have a low film thickness part.

Comparative Example 1

When manufacturing a 1st laminated body and a 2nd laminated body, by adjusting the slot gap of a slot die coater, it implemented except having changed so that the adhesive layer in the adhesive sheet finally obtained may have a low film thickness part shown in Table 1. In the same manner as in Example 1, an adhesive sheet wound body was produced.

Comparative Example 2

55 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of 4-acryloyl morpholine (N-acryloyl morpholine), 10 parts by mass of isobornyl acrylate and 25 parts by mass of 2-hydroxyethyl acrylate in the solution polymerization method Copolymerization was carried out to prepare a (meth) acrylic acid ester copolymer (A). When the molecular weight of this (meth) acrylic acid ester copolymer (A) was measured by the above-mentioned method, it was 600,000 in weight average molecular weights (Mw). When preparing the coating solution of an adhesive composition using this (meth) acrylic acid ester copolymer (A), forming an adhesive layer using this coating solution, and producing a 1st laminated body and a 2nd laminated body, By adjusting the slot gap of a die coater, the adhesive sheet winding body was produced like Example 1 except having changed so that the adhesive layer in the adhesive sheet finally obtained may have a low film thickness part shown in Table 1. .

Comparative Example 3

When manufacturing a 1st laminated body and a 2nd laminated body, by adjusting the slot gap of a slot die coater, it implemented except having changed so that the adhesive layer in the adhesive sheet finally obtained may have a low film thickness part shown in Table 1. In the same manner as in Example 1, an adhesive sheet wound body was produced.

Test Example 1 (Measurement of Young's Modulus of the First Film and the Second Film)

About the 1st film and the 2nd film used in the Example and the comparative example, using the universal tension test machine (Orientech company make, product name "Tensilon RTA-T-2M") based on JISK7161: 2014, Young's modulus was measured on the conditions of 200 mm / min of tensile velocity in the environment of 23 degreeC and 50% RH. The results are shown in Table 1.

Test Example 2 (Measurement of Storage Elastic Modulus of Adhesive Layer)

Two or more layers of the adhesive layers produced in the Example and the comparative example were laminated | stacked, and it was set as the laminated body of thickness 3mm. From the laminated body of the obtained adhesive layer, the cylinder (height 3mm) of diameter 8mm was punched out, and this was made into the sample.

According to JIS K7244-6: 1999, the storage elastic modulus (G ') (MPa) was measured under the following conditions by the torsion shearing method using a viscoelasticity measuring instrument (product made from REOMETRIC, product name "DYNAMIC ANALYZER"). Was measured. The results are shown in Table 1.

Measuring frequency: 1 Hz

Measuring temperature: 23 ℃

Test Example 3 (Measurement of Deviation in Film Thickness of Adhesive Layer)

The measurement sample which has a dimension of 108 cm x 100 cm was obtained by drawing out an adhesive sheet from the adhesive sheet winding body obtained in Examples 1-5 and Comparative Examples 1-2, and cutting parallel to a width direction. And the 1st film and the 2nd film were peeled from the said measurement sample, and in the remaining adhesive layer, the thickness in one point of the center was measured. For this measurement, a J type digital indicator manufactured by Teklock Corporation was used.

In addition, nine measurement samples were acquired similarly to the above, and the thickness in one point of the substantially center of each adhesive layer was measured similarly to the above.

Moreover, the measurement sample was obtained similarly to the above from the adhesive sheet winding body obtained by the comparative example 3. About the adhesive sheet wound body which concerns on the comparative example 3, according to the result of the test example 5 mentioned later, since the center part becomes a low film thickness part, it measures 10 pieces similarly to the above at one point 300 mm from the center to one side. The thickness was measured for the sample.

The maximum thickness T _max and the minimum thickness T _min were determined from the ten measurement results obtained as described above, and the average thickness T _AVE was calculated. And the deviation 1 (%) and the deviation 2 (%) are computed from the following formula (1) and following formula (2), respectively, and the one with a larger value among these is the variation (%) of the film thickness of an adhesive layer. It was set as. The results are shown in Table 1.

Deviation 1 (%) = (T _max -T _AVE ) / T _AVE } × 100. (One)

Deviation 2 (%) = (T _AVE − T _min ) / T _AVE } × 100. (2)

Test Example 4 (Measurement of Gel Fraction)

The adhesive sheet is taken out from the pressure-sensitive adhesive sheet wound body obtained in the examples and the comparative examples, cut into a size of 80 mm × 80 mm, the pressure-sensitive adhesive layer is wrapped with a polyester mesh (mesh size 200), and the mass is precisely balanced. It measured by and subtracted the mass of the said mesh only, and computed the mass only of an adhesive. Let the mass at this time be M1.

Next, the adhesive wrapped with the said polyester mesh was immersed in ethyl acetate for 24 hours at room temperature (23 degreeC). Then, the adhesive was taken out, air-dried for 24 hours in the environment of the temperature of 23 degreeC, and 50% of a relative humidity, and also it dried in 80 degreeC oven for 12 hours. After drying, the mass was weighed by precise balance, and the mass of the pressure-sensitive adhesive was calculated by subtracting the mass of the mesh alone. Let the mass at this time be M2. Gel fraction (%) is represented by (M2 / M1) x100. Thereby, the gel fraction (before UV irradiation) of the adhesive was derived. The results are shown in Table 1.

Moreover, about the adhesive layer of the adhesive sheet cut | disconnected similarly to the above, ultraviolet-ray (UV) was irradiated on the following conditions over the 1st film, the adhesive layer was hardened, and it was set as the adhesive layer after hardening. The gel fraction (after UV irradiation) was derived similarly to the above about the adhesive of the adhesive layer after this hardening. The results are shown in Table 1.

<UV irradiation condition>

Use of high pressure mercury lamp

Illuminance 200 ㎽ / ㎠, light quantity 1000 mJ / ㎠

UV illuminance and photometer use `` UVPF-A1 '' manufactured by iGraphics

Test Example 5 (Measurement of Low Film Thickness)

With respect to the pressure-sensitive adhesive sheets produced in Examples and Comparative Examples, the thickness of the pressure-sensitive adhesive layer at a position of 10 m in the longitudinal direction is determined from the end of the core in the longitudinal direction when it is wound. Manufactured by the company, and a product name "PG-201". At this time, it measured over the whole width direction of an adhesive layer. And the width | variety (mm) in the width direction of the adhesive layer was measured about the low film thickness part which has a thickness thinner 2 micrometers or more than the measured maximum thickness. The results are shown in Table 1. In addition, Table 1 divided and described the width | variety of the low film thickness part which exists in the center part of the width direction of an adhesive layer, and the width | variety of the low film thickness part located in the edge part of the width direction of an adhesive layer. Moreover, about the width | variety of the low film thickness part located in the edge part of the width direction of an adhesive layer, the width | variety of the low film thickness part located in the one end side of the width direction of an adhesive layer, and the low film thickness part located in the other end side of the width direction of an adhesive layer The average value of the widths was described.

Moreover, the ratio (%) of the sum total of the width | variety of the low film thickness part measured as mentioned above with respect to the full width (1080mm) of an adhesive layer was computed. The results are shown in Table 1.

Test Example 6 (Evaluation of Step Followability)

UV curable ink (product made by Teikoku Ink Co., Ltd., product name `` POS-911 ink '') on the surface of a glass plate (NSG Fresh Transfer Co., Ltd., product name "Corning Glass Eagle XG", length 90 mm x width 50 mm x thickness 0.5 mm) Was screen-printed in frame shape (appearance: 90 mm length x 50 mm width, 5 mm width) so that application thickness might be set to 10 micrometers. Subsequently, ultraviolet rays were irradiated (80 W / cm 2, metal halide lamp 2, lamp height 15 cm, belt speed 10-15 m / min), the printed ultraviolet curable ink was cured, and the step by printing (step difference) Height: 10 micrometers) The step difference forming glass plate was produced.

Polyethylene terephthalate (PET) film (Toyobo Co., Ltd. make, product name "PET A4300", thickness: 100 which peels a 2nd film from the adhesive sheet produced by the Example and the comparative example, and has an easily adhesive layer an exposed adhesive layer. It bonded together to the easily bonding layer of (micrometer). Subsequently, the 1st film was peeled off and the adhesive layer was exposed, and it laminated | stacked on each step formation glass plate so that an adhesive layer might cover the whole frame-shaped printing whole surface using a laminator (manufactured by Fujipla Co., product name "LPD3214"). Then, autoclave process was carried out for 30 minutes on 50 degreeC and 0.5 Mpa conditions, and it was left to stand at atmospheric pressure, 23 degreeC, and 50% RH for 24 hours. Subsequently, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays under the same conditions as in Test Example 4 over the PET film to cure the pressure-sensitive adhesive layer.

And it stored for 72 hours on 85 degreeC and 85% RH high temperature, high humidity conditions (durability test). Thereafter, the presence or absence of bubbles, lifting and peeling at the interface between the printing step and the pressure-sensitive adhesive layer after curing was visually confirmed, and the step tracking performance was evaluated based on the following criteria.

(Circle): foam | bubble, lifting, and peeling did not arise.

X: At least one of bubble, lifting and peeling occurred.

Test Example 7 (Evaluation of Appearance of Adhesive Sheet)

A pressure-sensitive adhesive sheet is taken out from the pressure-sensitive adhesive sheet wound body obtained in the examples and the comparative examples after 7 days from the production, and at the position of 10 m from the end to be the core material side, the occurrence of appearance abnormalities such as folded wrinkles and strain wrinkles is visually observed. It was confirmed. And the width | variety (mm) in the width direction of the adhesive layer with respect to the said abnormality abnormality was measured. The results are shown in Table 1. In addition, in Table 1, the width | variety of the external appearance abnormality which generate | occur | produced in the center part of the width direction of an adhesive layer, and the width | variety of the external appearance abnormality which occurred in the width direction edge part of an adhesive layer were described. Moreover, about the width | variety of the external appearance abnormality which generate | occur | produced at the edge part of the width direction of an adhesive layer, the average value of the width | variety of the external appearance abnormality which occurred in the one end side of the width direction of an adhesive layer, and the width | variety of the external abnormality which occurred in the other end side of the width direction of an adhesive layer was described. .

Moreover, the ratio of the sum total of the width | variety of the external appearance or more measured as mentioned above with respect to the full width (1080 mm) of an adhesive layer is computed, and it shows in Table 1 as ratio (%) of the width direction or more of an external appearance or more.

Moreover, all the adhesive sheets are taken out from the adhesive sheet winding body obtained by the Example and the comparative example after 7 days from manufacture, and the appearance abnormalities, such as a folding wrinkle and a deformation | transformation wrinkle, are visually observed over the whole length (300 m). It was confirmed. And length (m) in the longitudinal direction of the adhesive sheet with respect to the said abnormality abnormality was measured. The results are shown in Table 1. In addition, in Table 1, the length (m) about the external appearance abnormality in the edge part of the width direction of an adhesive layer and the length (m) about the external appearance abnormality in the center part of the width direction of an adhesive layer were described and divided.

Moreover, the external appearance of the adhesive sheet was evaluated based on the following criteria. The results are shown in Table 1.

(Double-circle): The ratio (%) of the width direction more than an external appearance is less than 7%.

(Circle): The ratio (%) of the width direction more than an external appearance is 7% or more and less than 10%.

(Triangle | delta): The ratio (%) of the width direction more than an external appearance is 10% or more and less than 15%.

X: The ratio (%) of the width direction more than an external appearance is 15% or more.

As can be seen from Table 1, in the pressure-sensitive adhesive sheet wound body obtained in the example, the pressure-sensitive adhesive sheet having excellent appearance could be extracted.

The adhesive sheet wound body of this invention can be used suitably for manufacture of a display body (display), for example.

1: adhesive sheet winding object
10: adhesive sheet
11: first film
12: pressure-sensitive adhesive layer
13: second film
20: heartwood

Claims (8)

The long adhesive sheet which consists of a 1st film, the adhesive layer laminated | stacked on the single side | surface side of the said 1st film, and the 2nd film laminated | stacked on the surface side opposite to the said 1st film in the said adhesive layer, As an adhesive sheet winding body which makes the surface by the said 1st film side into an inside, and is wound by a cylindrical or cylindrical core material,
The pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive,
The thickness of the said adhesive layer is 100 micrometers or more and 1000 micrometers or less,
The following condition A or condition B is satisfy | filled, The adhesive sheet winding body characterized by the above-mentioned.
Condition A: In the width direction of the said adhesive layer, the low film thickness part which is 2 micrometers or more thinner than the maximum thickness of the adhesive layer in the said width direction does not exist;
Condition B: The low film thickness part is present only in a region within 10% of the full width from both ends in the width direction of the pressure sensitive adhesive layer, and the sum of the widths of the low film thickness part is 10% of the total width of the pressure sensitive adhesive layer. Is less than The method of claim 1,
At least one of the said 1st film and said 2nd film is a peeling film, The adhesive sheet winding body characterized by the above-mentioned. The method of claim 1,
The thickness of the said 1st film is the same as the thickness of the said 2nd film, or is thicker than the thickness of the said 2nd film, The adhesive sheet winding body characterized by the above-mentioned. The method of claim 1,
The storage elastic modulus at 23 degrees C of the said adhesive layer is 0.001 Mpa or more and 5 Mpa or less, The adhesive sheet winding body characterized by the above-mentioned. The method of claim 1,
The gel fraction of the said acrylic adhesive is 30% or more and 80% or less, The adhesive sheet winding body characterized by the above-mentioned. The method of claim 1,
Variation in the film thickness of the said adhesive layer is less than 2%, The adhesive sheet winding body characterized by the above-mentioned. The method of claim 1,
The Young's modulus at 23 degrees C of a said 1st film is 0.01 GPa or more and 20 GPa or less, The adhesive sheet winding body characterized by the above-mentioned. The method of claim 1,
The winding number of the said adhesive sheet is three rounds or more, The adhesive sheet winding body characterized by the above-mentioned.

Images