JP2019156878A - Adhesion sheet wound body - Google Patents

Abstract

To provide an adhesion sheet wound body capable of feeding an adhesion sheet having excellent appearance.SOLUTION: There is provided an adhesion sheet wound body 1 in which, a long-sized adhesion sheet 10 comprising a first film 11, an adhesion layer 12, and a second film 13, is wound around a columnar or cylindrical core material 20 in a state in which a surface on the first film 11 side is inside, the adhesion layer 12 is formed of an acrylic pressure sensitive adhesion, thickness of the adhesion layer 12 is 100 μm or greater and 1000 μm or smaller, and following condition A or B is satisfied: a condition A is that, in a width direction of the adhesion layer 12, there is no low film thickness part which is thinner than a maximum thickness of the adhesion layer 12 in the width direction by 2 μm or larger; a condition B is that, the low film thickness part exists in only a region within 10% of whole width from both ends of the adhesion layer 12 in the width direction, and a total of the width of the low film thickness part is 10% or smaller of whole width of the adhesion layer 12, in the adhesion sheet wound body 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pressure-sensitive adhesive sheet roll suitable for use in a display body (display), for example, having a pressure-sensitive adhesive layer having a relatively thick thickness.

  In general, the thickness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet is appropriately adjusted according to the application. For example, a pressure-sensitive adhesive sheet used for manufacturing a display using a display module may be selected to have a relatively thick pressure-sensitive adhesive layer. In such an application, an adhesive layer is embedded in the gap between the protective panel and the display module constituting the display from the viewpoint of improving the image quality of the display. Here, as the protective panel, a panel having a frame-like printed layer as a step on the display module side is also used. At this time, by using a pressure-sensitive adhesive layer having a relatively thick thickness, the pressure-sensitive adhesive layer can be made to follow the step well, thereby suppressing the problem of light reflection loss near the step. Has been done.

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

Japanese Patent Laying-Open No. 2015-147873

  By the way, the pressure-sensitive adhesive sheet is usually manufactured in a long state and is wound around a columnar or cylindrical core material to form a pressure-sensitive adhesive sheet roll. Here, in the pressure-sensitive adhesive sheet having a relatively thick pressure-sensitive adhesive layer as described above, a problem in appearance is likely to occur when the pressure-sensitive adhesive sheet is wound. For example, a large number of wrinkles may occur in the pressure-sensitive adhesive sheet fed out from such a pressure-sensitive adhesive sheet roll.

  This invention is made | formed in view of the above actual conditions, and it aims at providing the adhesive sheet winding body which can pay out the adhesive sheet which has the outstanding external appearance.

In order to achieve the above object, first, the present invention includes a first film, a pressure-sensitive adhesive layer laminated on one side of the first film, and a surface of the pressure-sensitive adhesive layer opposite to the first film. A long pressure-sensitive adhesive sheet comprising a second film laminated on the side is wound on a cylindrical or cylindrical core member with the surface on the first film side facing inward The pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive, and the thickness of the pressure-sensitive adhesive layer is 100 μm or more and 1000 μm or less, and satisfies the following condition A or condition B Condition A: There is no low film thickness portion that is 2 μm or more thinner than the maximum thickness of the pressure-sensitive adhesive layer in the width direction in the width direction of the pressure-sensitive adhesive layer;
Condition B: The low film thickness portion exists only in a region within 10% of the entire width from both ends in the width direction of the pressure-sensitive adhesive layer, and the total width of the low film thickness portion is that of the pressure-sensitive adhesive layer. Provided is a pressure-sensitive adhesive sheet roll characterized by being 10% or less of the total width (Invention 1).

  In the pressure-sensitive adhesive sheet roll according to the invention (Invention 1), the above-described low film thickness portion does not exist, or the above-described low film thickness portion is within 10% of the entire width from both ends in the width direction of the pressure-sensitive adhesive layer. When the total width is 10% or less of the total width of the pressure-sensitive adhesive layer, the pressure-sensitive adhesive sheet having a good appearance in which the generation of wrinkles is suppressed can be fed out.

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

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

  In the said invention (invention 1-3), it is preferable that the storage elastic modulus in 23 degreeC 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 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 3 rounds or more (invention 8).

  According to the pressure-sensitive adhesive sheet roll according to the present invention, a pressure-sensitive adhesive sheet having an excellent appearance can be fed out.

It is a perspective view of the adhesive sheet winding body concerning one 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.

Hereinafter, embodiments of the present invention will be 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, the pressure-sensitive adhesive sheet roll 1 according to the present embodiment is formed by winding a long pressure-sensitive adhesive sheet 10 around a columnar or cylindrical core member 20.

  Moreover, in FIG. 2, sectional drawing of the adhesive sheet 10 in this embodiment is shown. As shown in FIG. 2, the pressure-sensitive adhesive sheet 10 in this embodiment includes a first film 11, a pressure-sensitive adhesive layer 12 laminated on one side of the first film 11, and a first film 11 in the pressure-sensitive adhesive layer 12. And a second film 13 laminated on the opposite surface side.

  Here, the pressure-sensitive adhesive sheet roll 1 according to the present embodiment is formed by winding the pressure-sensitive adhesive sheet 10 around the core material 20 with the surface on the first film 11 side inward.

In the pressure-sensitive adhesive sheet roll 1 according to this embodiment, the thickness of the pressure-sensitive adhesive layer 12 is 100 μm or more and 1000 μm or less. The pressure-sensitive adhesive sheet roll 1 according to this embodiment satisfies the following condition A or condition B.
Condition A: There is no low film thickness portion that is 2 μm or thinner in the width direction of the pressure-sensitive adhesive layer 12 than the maximum thickness of the pressure-sensitive adhesive layer 12 in the width direction.
Condition B: The low film thickness portion exists only in a region within 10% of the entire width from both ends in the width direction of the pressure-sensitive adhesive layer 12, and the total width of the low film thickness portion is the pressure-sensitive adhesive layer 12. It is 10% or less of the entire width.

  In the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, by satisfying the condition A or the condition B described above, the pressure-sensitive adhesive in which the generation of wrinkles is suppressed despite the thickness of the pressure-sensitive adhesive layer 12 being 100 μm or more. The sheet 10 can be fed out. That is, according to the pressure-sensitive adhesive sheet roll 1 according to this embodiment, a pressure-sensitive adhesive sheet having a good appearance can be fed out. In the present specification, the diameter of the core material 20 refers to the outer diameter of the cylinder when the core material 20 is cylindrical.

  When the low film thickness portion described above is present in a region exceeding 10% of the entire width from both ends in the width direction of the pressure-sensitive adhesive layer 12, the ratio of the wrinkled portion in the pressure-sensitive adhesive layer 12 becomes very large and is fed out. The appearance of the pressure-sensitive adhesive sheet 10 becomes unacceptable. From the viewpoint of effectively suppressing the occurrence of wrinkles and allowing the pressure-sensitive adhesive sheet to be fed out with a better appearance, the region where the low-thickness portion is present when the low-thickness portion described above is present, A region within 5% of the entire width from both ends in the width direction of the pressure-sensitive adhesive layer 12 is preferable, and a region within 4% is particularly preferable.

  In addition, even when the total width of the low-thickness portions described above exceeds 10% of the total width of the pressure-sensitive adhesive layer 12, the ratio of wrinkled portions in the pressure-sensitive adhesive layer 12 becomes very large, and the pressure-sensitive adhesive is fed out. The appearance of the sheet 10 becomes unacceptable. From the viewpoint of effectively suppressing the generation of wrinkles and allowing the pressure-sensitive adhesive sheet 10 to be fed out with a better appearance, the total width of the low-thickness portions when the low-thickness portions described above are present. However, it is preferable that it is 8% or less of the full width of the adhesive layer 12, and it is especially preferable that it is 4% or less.

  In the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, the length of the portion that satisfies the above-described condition A or condition B (length in the feed-out direction) with respect to the entire length of the pressure-sensitive adhesive sheet 10 that is fed out (length in the feed-out direction). ) Is preferably 50% or more, particularly preferably 75% or more, and more preferably 100%. When the ratio is 50% or more, generation of wrinkles is effectively suppressed, and the pressure-sensitive adhesive sheet 10 having a better appearance can be easily fed out. In the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, the pressure-sensitive adhesive sheet 10 may include both a portion that satisfies the condition A and a portion that satisfies the condition B.

  In the present specification, the wrinkles generated in the pressure-sensitive adhesive sheet drawn out from the pressure-sensitive adhesive sheet roll body are any of wrinkles generated as a result of at least a part of the pressure-sensitive adhesive sheet being distorted and bending wrinkles generated as a result of the pressure-sensitive adhesive sheet being bent. It shall be said.

1. Configuration of pressure-sensitive adhesive sheet roll (1) Pressure-sensitive adhesive layer The thickness of the pressure-sensitive adhesive layer 12 in this embodiment is 100 μm or more. When the thickness of the pressure-sensitive adhesive layer 12 is 100 μm or more, the pressure-sensitive adhesive sheet 10 in the present embodiment is suitable for applications requiring a relatively thick pressure-sensitive adhesive layer. From such a viewpoint, the thickness of the pressure-sensitive adhesive layer 12 is preferably 140 μm or more, and particularly preferably 180 μm 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, and particularly preferably 300 μm or less.

  The variation in the film thickness of the pressure-sensitive adhesive layer 12 in this embodiment is preferably less than 2%, particularly preferably 1% or less, and further preferably 0.1% or less. The variation in the thickness of the pressure-sensitive adhesive layer 12 is less than 2%, so that the distinction between the low-thickness portion and the other portions becomes clearer, and the pressure-sensitive adhesive layer 12 has the above-described conditions regarding the low-thickness portion. It will be easy to satisfy. The details of the variation measuring method are as described in the test examples described 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, particularly preferably 0.005 MPa or more, from the viewpoint of further reducing the generation of wrinkles. It is preferable that it is 0.01 MPa or more. The storage elastic modulus is preferably 5 MPa or less, more preferably 1 MPa or less, particularly preferably 0.5 MPa or less, and further preferably 0.18 MPa or less. The upper limit of the storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer 12 is not more than the above, so that even when the pressure-sensitive adhesive sheet 10 in this embodiment is affixed to an adherend having a step on the surface, In this case, the pressure-sensitive 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 pressure-sensitive adhesive layer 12 in the present embodiment is composed of an acrylic pressure-sensitive adhesive. Thereby, the adhesive sheet 10 in this embodiment becomes easy to exhibit desired adhesive force. Specific examples of the acrylic pressure-sensitive adhesive are not limited as long as the pressure-sensitive adhesive layer 12 can be formed to the above-described thickness. Further, the acrylic pressure-sensitive adhesive may be any of an emulsion type, a solvent type or a solventless type, and may be either a crosslinked type or a non-crosslinked type.

  Further, the acrylic pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 may be an active energy ray-curable pressure-sensitive adhesive or an active energy ray non-curable pressure-sensitive adhesive. 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 where the pressure-sensitive adhesive sheet roll 1 in the present embodiment is manufactured. It may be one that has been cured, or one that has not been cured by active energy rays. Among these, the acrylic pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 in the present embodiment is preferably an active energy ray-curable pressure-sensitive adhesive, and in particular, the pressure-sensitive adhesive sheet roll 1 in the present embodiment is manufactured. It is preferable that the active energy ray has not been cured yet. Although such an adhesive is relatively soft before curing, even if the adhesive layer 12 is made of such an adhesive and the thickness thereof is relatively thick, the adhesive in this embodiment is used. According to the sheet winding body 1, generation of wrinkles can be effectively suppressed. Therefore, the pressure-sensitive adhesive sheet roll 1 in the present embodiment has the pressure-sensitive adhesive layer 12 that is an active energy ray-curable pressure-sensitive adhesive, and is still cured with active energy rays in a state where the pressure-sensitive adhesive sheet roll 1 is manufactured. It is suitable when it is comprised from what is not.

  As described above, by using the active energy ray-curable acrylic pressure-sensitive adhesive that has not yet been cured with active energy rays in the state in which the pressure-sensitive adhesive sheet roll 1 according to this embodiment is manufactured, the pressure-sensitive adhesive in this embodiment is used. The sheet 10 is suitable for application to an adherend having a step on the surface. That is, the adhesive layer 12 is stuck to an adherend in a state where the active energy ray is not cured, and after the adhesive layer 12 is made to follow the step well, the active energy ray is cured. The cohesive strength of the layer 12 is sufficiently high. Thereby, even when the cured pressure-sensitive adhesive layer 12 is attached to the adherend and placed under high-temperature and high-humidity conditions, it is possible to satisfactorily suppress the occurrence of bubbles, floats, peeling, etc. in the vicinity of the steps. be able to.

  Below, the adhesive layer 12 in this embodiment is comprised by the active energy ray-curable acrylic adhesive, and especially the adhesive sheet manufactures the adhesive sheet winding body 1 in this embodiment. The case where the active energy ray has not been cured yet in the applied state will be described. 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”). The composition may be referred to as an adhesive composition P). In addition, it is preferable that the said adhesive composition P further contains a photoinitiator (D) depending on necessity. Moreover, in this specification, (meth) acrylic acid means both acrylic acid and methacrylic acid. The same applies to other similar terms. Further, the term “polymer” includes the concept of “copolymer”.

(1-1) (Meth) acrylic acid ester copolymer (A)
The (meth) acrylic acid ester copolymer (A) preferably contains a reactive group-containing monomer having in its molecule a reactive group that reacts with the crosslinking agent (B) as a monomer unit constituting the polymer. . Thereby, the reactive group derived from the reactive group-containing monomer can react with the crosslinking agent (B).

  Examples of the reactive group-containing monomer include a monomer having a hydroxyl group in the molecule (hydroxyl group-containing monomer), a monomer having a carboxy group in the molecule (carboxy group-containing monomer), and a monomer having an amino group in the molecule (amino group-containing monomer). Etc.) are preferred. Among these, a hydroxyl group-containing monomer that is excellent in reactivity with the crosslinking agent (B) and has little adverse effect on the adherend is particularly preferable.

  Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, (meth And (meth) acrylic acid hydroxyalkyl esters such as 3-hydroxybutyl acrylate and 4-hydroxybutyl (meth) acrylate. Among them, the (meth) acrylic acid ester copolymer (A) is obtained by reacting the hydroxyl group with the crosslinking agent (B) and copolymerizing with other monomers. Ethyl or 4-hydroxybutyl (meth) acrylate is preferred. These may be used alone or in combination of two or more.

  The (meth) acrylic acid ester copolymer (A) preferably contains a hydroxyl group-containing monomer as a lower limit of 1% by mass or more as a monomer unit constituting the polymer, and preferably contains 5% by mass or more. More preferably, the content is preferably 10% by mass or more, and more preferably 12% by mass or more. Further, the (meth) acrylic acid ester copolymer (A) preferably contains a hydroxyl group-containing monomer as an upper limit of 30% by mass or less, particularly 25% by mass or less as a monomer unit constituting the polymer. It is preferable to contain 20% by mass or less.

  The (meth) acrylic acid ester copolymer (A) contains a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group as a monomer unit constituting the polymer. Can be expressed. Examples of the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and (meth) acrylic acid n-. Butyl, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, (meth) acrylic acid Examples include n-dodecyl, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like. Among these, from the viewpoint of further improving the adhesiveness, a (meth) acrylic acid ester having 4 to 8 carbon atoms in the alkyl group is preferable, and 2-ethylhexyl (meth) acrylate is particularly preferable. In addition, these may be used independently and may be used in combination of 2 or more type.

  The (meth) acrylic acid ester copolymer (A) may contain 40% by mass or more of a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms as the monomer unit constituting the polymer. The content is preferably 50% by mass or more, more preferably 60% by mass or more. Moreover, it is preferable to contain 90 mass% or less of the (meth) acrylic acid alkyl ester whose carbon number of an alkyl group is 1-20, It is preferable to contain especially 80 mass% or less, Furthermore, 70 mass% or less is contained. Is preferred.

  The (meth) acrylic acid ester copolymer (A) also preferably contains a monomer having an alicyclic structure in the molecule (an alicyclic structure-containing monomer) as a monomer unit constituting the copolymer. Since the alicyclic structure-containing monomer is bulky, it is presumed that the presence of the alicyclic structure-containing monomer in the polymer increases the distance between the polymers, and the resulting pressure-sensitive adhesive can be made excellent in flexibility. . Even if it is a case where the adhesive sheet 10 in this embodiment is stuck on the adherend which has a level | step difference on the surface because a (meth) acrylic acid ester copolymer (A) contains an alicyclic structure containing monomer, it is adhesion When the agent layer 12 is pasted, the step can be satisfactorily followed.

  The carbocyclic ring of the alicyclic structure in the alicyclic structure-containing monomer may have a saturated structure or may have an unsaturated bond in part. The alicyclic structure may be a monocyclic alicyclic structure or a polycyclic alicyclic structure such as a bicyclic ring or a tricyclic ring. From the viewpoint of increasing the distance between the obtained (meth) acrylic acid ester copolymer (A) and effectively exhibiting the flexibility of the pressure-sensitive adhesive, the alicyclic structure is a polycyclic alicyclic structure. (Polycyclic structure) is preferable. Furthermore, considering the compatibility between the (meth) acrylic acid ester copolymer (A) and other components, the polycyclic structure is particularly preferably bicyclic to tetracyclic. In addition, from the viewpoint of effectively exerting the flexibility of the pressure-sensitive adhesive as described above, the carbon number of the alicyclic structure (refers to all the carbon numbers of the portion forming the ring, and a plurality of rings are independent. The total number of carbon atoms) is usually preferably 5 or more, particularly preferably 7 or more. On the other hand, the upper limit of the number of carbon atoms in the alicyclic structure is not particularly limited, but it is preferably 15 or less and particularly preferably 10 or less from the viewpoint of compatibility as described above.

  Examples of the alicyclic structure include a cyclohexyl skeleton, dicyclopentadiene skeleton, adamantane skeleton, isobornyl skeleton, 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, cubane skeleton, basketn skeleton, Hausan skeleton, spiro skeleton, etc. are included, and among them, more excellent durability is exhibited. Those containing a dicyclopentadiene skeleton (carbon number of alicyclic structure: 10), adamantane skeleton (carbon number of alicyclic structure: 10) or isobornyl skeleton (carbon number of alicyclic structure: 7) are particularly preferable. Contains isobornyl skeleton Preference is.

  As the alicyclic structure-containing monomer, a (meth) acrylic acid ester monomer containing the above skeleton is preferable. Specifically, cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, (meth) Examples include adamantyl acrylate, isobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and dicyclopentenyloxyethyl (meth) acrylate. Among them, (meth) acryl that exhibits superior durability. Dicyclopentanyl acid, adamantyl (meth) acrylate or isobornyl (meth) acrylate is preferred, and isobornyl (meth) acrylate is particularly preferred. These may be used individually by 1 type and may be used in combination of 2 or more type.

  When the (meth) acrylic acid ester copolymer (A) contains an alicyclic structure-containing monomer as a monomer unit constituting the polymer, the (meth) acrylic acid ester copolymer (A) is an alicyclic ring. It is preferable to contain 3% by mass or more of the formula structure-containing monomer, particularly preferably 5% by mass or more, and more preferably 8% by mass or more. The (meth) acrylic acid ester copolymer (A) preferably contains 35% by mass or less of an alicyclic structure-containing monomer as a monomer unit constituting the polymer, and particularly 25% by mass or less. It is preferable to contain 15% by mass or less. When the content of the alicyclic structure-containing monomer is in the above range, the resulting pressure-sensitive adhesive has a more excellent step following ability.

  The (meth) acrylic acid ester copolymer (A) also preferably contains a monomer having a nitrogen atom in the molecule (nitrogen atom-containing monomer) as a monomer unit constituting the 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. By allowing the nitrogen atom-containing monomer to be present in the polymer as a structural unit, the reaction between the acrylic ester copolymer (A) and the crosslinking agent (B) is promoted, or the adhesive is polar, The adhesiveness of the pressure-sensitive adhesive to a polar surface such as can be improved.

  Examples of the nitrogen atom-containing monomer include a monomer having a tertiary amino group, a monomer having an amide group, a monomer having a nitrogen-containing heterocycle, and the like. Among these, a monomer having a nitrogen-containing heterocycle is preferable.

  Examples of the monomer having a nitrogen-containing heterocyclic ring include N- (meth) acryloylmorpholine, N-vinyl-2-pyrrolidone, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidine, N- (meth) acryloyl. Pyrrolidine, N- (meth) acryloylaziridine, aziridinylethyl (meth) acrylate, 2-vinylpyridine, 4-vinylpyridine, 2-vinylpyrazine, 1-vinylimidazole, N-vinylcarbazole, N-vinylphthalimide, etc. Among them, N- (meth) acryloylmorpholine is preferred from the viewpoint of improving the cohesive force of the resulting pressure-sensitive adhesive in addition to adhesion to a polar surface such as a glass surface, and improving blister resistance. N-acryloylmorpholine is preferred.

  Examples of the nitrogen atom-containing monomer other than the above-mentioned monomer having a nitrogen-containing heterocyclic ring include (meth) acrylamide, N-methyl (meth) acrylamide, N-methylol (meth) acrylamide, N-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-vinylcaprolactam, dimethylaminoethyl (meth) acrylate, and the like can also be used. The above nitrogen atom containing monomers may be used individually by 1 type, and may be used in combination of 2 or more type.

  When the (meth) acrylic acid ester copolymer (A) contains a nitrogen atom-containing monomer as a monomer unit constituting the polymer, the (meth) acrylic acid ester copolymer (A) is a nitrogen atom-containing monomer. Is preferably contained in an amount of 1% by mass or more, particularly preferably 2% by mass or more, and more preferably 5% by mass or more. Further, the (meth) acrylic acid ester copolymer (A) preferably contains 40% by mass or less of a nitrogen atom-containing monomer as a monomer unit constituting the polymer, and particularly preferably contains 25% by mass or less. More preferably, it is preferably contained in an amount of 15% by mass or less. When the content of the nitrogen atom-containing monomer is within the above range, the adhesion of the obtained pressure-sensitive adhesive to a polar surface such as a glass surface is effectively improved.

  The (meth) acrylic acid ester copolymer (A) may contain other monomers as monomer units constituting the polymer, if desired. The other monomer is preferably a monomer that does not contain a reactive functional group. Examples of such other monomers include (meth) acrylic acid alkoxyalkyl esters such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, vinyl acetate, and styrene. These may be used alone or in combination of two or more.

  The polymerization aspect of the (meth) acrylic acid ester copolymer (A) may be a random copolymer or a block copolymer.

  The weight average molecular weight of the (meth) acrylic acid ester copolymer (A) is preferably 100,000 or more as a lower limit, particularly preferably 200,000 or more, and more preferably 300,000 or more. . When the lower limit of the weight average molecular weight of the (meth) acrylic acid ester copolymer (A) is not less than the above, the cohesive force of the obtained pressure-sensitive adhesive can be effectively improved. Further, the weight average molecular weight of the (meth) acrylic acid ester copolymer (A) is preferably 1,000,000 or less as an upper limit, particularly preferably 850,000 or less, and more preferably 700,000 or less. Is preferred. When the upper limit of the weight average molecular weight of the (meth) acrylic acid ester copolymer (A) is not more than the above, it is possible to suppress the storage elastic modulus of the obtained pressure-sensitive adhesive from becoming too high. In addition, the weight average molecular weight in this specification is the value of standard polystyrene conversion measured by the gel permeation chromatography (GPC) method.

  In the adhesive composition P, the (meth) acrylic ester copolymer (A) may be used alone or in combination of two or more.

(1-2) Crosslinking agent (B)
The crosslinking agent (B) can crosslink the (meth) acrylic acid ester copolymer (A) by heating the pressure-sensitive adhesive composition P, and can satisfactorily form a three-dimensional network structure. Thereby, the cohesive force of the obtained adhesive improves more and it becomes easy to adjust a gel fraction and a storage elastic modulus to a suitable range.

  As said crosslinking agent (B), what is necessary is just to react with the reactive functional group which (meth) acrylic acid ester copolymer (A) has, for example, isocyanate type crosslinking agent, epoxy type crosslinking agent, amine type Crosslinking agent, melamine crosslinking agent, aziridine 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 Agents and the like. Here, as described above, since the (meth) acrylic acid ester copolymer (A) preferably contains a hydroxyl group-containing monomer as a constituent monomer unit, the crosslinking agent (B) has excellent reactivity with a hydroxyl group. It is preferable to use an isocyanate-based crosslinking agent. In addition, a crosslinking agent (B) can be used individually by 1 type or in combination of 2 or more types.

  The isocyanate-based crosslinking agent contains at least a polyisocyanate compound. Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate, etc. , And their biuret bodies, isocyanurate bodies, and adduct bodies that are a reaction product with low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Among these, trimethylolpropane-modified aromatic polyisocyanate, particularly trimethylolpropane-modified tolylene diisocyanate is preferable from the viewpoint of reactivity with hydroxyl groups.

  The content of the crosslinking agent (B) in the pressure-sensitive adhesive composition P is preferably 0.01 parts by mass or more with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer (A), particularly 0. It is preferably 0.05 parts by mass or more, more preferably 0.1 parts by mass or more. Further, the content is preferably 3 parts by mass or less, particularly preferably 2 parts by mass or less, and further preferably 1 part by mass or less. When the content of the crosslinking agent (B) is in the above range, the degree of crosslinking becomes appropriate, and the gel fraction and the storage elastic modulus of the pressure-sensitive adhesive layer can be easily adjusted to a suitable range.

(1-3) Active energy ray-curable component (C)
When the adhesive composition P contains the active energy ray-curable component (C), the adhesive obtained by crosslinking (thermal crosslinking) the adhesive composition P becomes an active energy ray-curable adhesive. . In this adhesive, the active energy ray-curable components (C) are polymerized to each other by curing by irradiation with active energy rays after the adherend is pasted, and the polymerized active energy ray-curable components (C) are (meth) acrylic. It is presumed that the acid ester copolymer (A) is entangled with the crosslinked structure (three-dimensional network structure). Thereby, it becomes easy to favorably raise the gel fraction and storage elastic modulus of the adhesive after curing. The pressure-sensitive adhesive having such a higher-order structure has a high cohesive force and a high film strength, and therefore is excellent in the step following property under high temperature and 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 with active energy rays and can obtain the above-described effects, and may be any of a monomer, an oligomer, or a polymer. It may be a mixture of Among these, a polyfunctional acrylate monomer excellent in compatibility with the (meth) acrylic acid ester copolymer (A) and the like can be preferably exemplified.

  Examples of polyfunctional acrylate monomers include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth) acrylate. , Neopentyl glycol adipate di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl di (meth) acrylate, ethylene oxide modified diphosphate ( (Meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyl di (meth) acrylate, ethoxylated bisphenol A diacrylate, 9,9-bis [4- (2-acrylic) Bifunctional type such as yloxyethoxy) phenyl] fluorene; trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate , Trifunctional type such as propylene oxide modified trimethylolpropane tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, ε-caprolactone modified tris- (2- (meth) acryloxyethyl) isocyanurate; Tetrafunctional type such as (meth) acrylate and pentaerythritol tetra (meth) acrylate; pentafunctional type such as propionic acid-modified dipentaerythritol penta (meth) acrylate; dipentaerythritol And hexafunctional types such as hexole (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate. Among these, di (acryloxyethyl) isocyanurate, tris (acryloxyethyl) isocyanurate, ε-caprolactone modified tris- (2- A polyfunctional acrylate monomer containing an isocyanurate structure in the molecule such as (meth) acryloxyethyl) isocyanurate is preferable, and a polyfunctional acrylate monomer having a trifunctional or higher functionality and an isocyanurate structure in the molecule is more preferable. 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. Further, from the viewpoint of compatibility with the (meth) acrylic acid ester copolymer (A), the polyfunctional acrylate monomer preferably has a molecular weight of less than 1000.

  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 acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polybutadiene acrylate, and silicone acrylate.

  The weight average molecular weight of the acrylate oligomer is preferably 50,000 or less, and preferably 40,000 or less. The weight average molecular weight is preferably 1,000 or more, and particularly preferably 3,000 or more. These acrylate oligomers may be used alone or in combination of two or more.

  In addition, as the active energy ray-curable component (C), an adduct acrylate polymer in which a group having a (meth) acryloyl group is introduced into a side chain can also be used. Such an adduct acrylate-based polymer uses a copolymer of (meth) acrylic acid ester and a monomer having a crosslinkable functional group in the molecule, and a part of the crosslinkable functional group of the copolymer. , A (meth) acryloyl group and a compound having a group that reacts with a crosslinkable functional group can be reacted.

  The weight average molecular weight of the adduct acrylate polymer is preferably 50,000 or more, particularly preferably 100,000 or more. The weight average molecular weight is preferably 900,000 or less, particularly preferably 500,000 or less.

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

  The content of the active energy ray-curable component (C) in the pressure-sensitive adhesive composition P improves the cohesive strength of the resulting pressure-sensitive adhesive, increases the gel fraction and the storage elastic modulus to a suitable range, and increases the temperature and humidity. From the standpoint of excellent step following performance under conditions, the lower limit is preferably 1 part by mass or more, preferably 3 parts by mass with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer (A). More preferably, it is more preferably 5 parts by mass or more. On the other hand, the content is 50 parts by mass or less as an upper limit from the viewpoint of preventing the active energy ray-curable component (C) from phase-separating with the (meth) acrylic acid ester copolymer (A). Is more preferably 20 parts by mass or less, and more preferably 10 parts by mass or less considering the viewpoint of further improving the initial step following ability.

(1-4) Photopolymerization initiator (D)
When ultraviolet rays are used as the active energy ray used to cure the active energy ray-curable adhesive, the adhesive composition P preferably further contains a photopolymerization initiator (D). By containing the photopolymerization initiator (D) in this way, the active energy ray-curable component (C) can be efficiently polymerized, and the polymerization curing time and the amount of active energy ray irradiation can be reduced. it can.

  Examples of such photopolymerization initiator (D) include benzozoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, and 2,2-dimethoxy. 2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl 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, '-Diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethyl Thioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, oligo [2-hydroxy-2-methyl-1 [4- (1-methylvinyl) phenyl] propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and the like. Among these, it is more preferable to use a phosphine oxide-based photopolymerization initiator because it can perform a sufficient curing reaction even through a resin plate containing an ultraviolet absorber. For example, 2,4,6-trimethylbenzoyl It is particularly preferred to use -diphenyl-phosphine oxide. These may be used alone or in combination of two or more.

  The content of the photopolymerization initiator (D) in the adhesive composition P is preferably 0.1 parts by mass or more as a lower limit with respect to 100 parts by mass of the active energy ray-curable component (C), In particular, the amount is preferably 1 part by mass 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 For the adhesive composition P, if desired, various additives usually used for acrylic adhesives, such as silane coupling agents, ultraviolet absorbers, antistatic agents, and tackifiers. Antioxidants, light stabilizers, softeners, fillers, refractive index adjusters, and the like can be added. In addition, the below-mentioned polymerization solvent and dilution solvent shall not be contained in the additive which comprises the adhesive composition P.

  Here, when the pressure-sensitive adhesive composition P contains a silane coupling agent, the resulting pressure-sensitive adhesive has improved adhesion to a glass member or a plastic plate.

  As the silane coupling agent, an organosilicon compound having at least one alkoxysilyl group in the molecule, having good compatibility with the (meth) acrylic acid ester copolymer (A) and having light transmittance Is preferred.

  Examples of the silane coupling agent include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 2- ( 3,4-epoxycyclohexyl) silicon compounds having an epoxy structure such as ethyltrimethoxysilane, mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethoxymethylsilane Amino group-containing silicon such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane Compound, 3-chloropropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, or at least one of them, and alkyl group-containing silicon such as methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane Examples include condensates with compounds. Among these, 3-glycidoxypropyltrimethoxysilane is preferable from the viewpoint that the adhesiveness between the pressure-sensitive adhesive layer 12 and the glass member or the plastic plate can be effectively improved. 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 is preferably 0.01 parts by mass or more with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer (A). In particular, it is preferably 0.05 parts by mass or more, and more preferably 0.1 parts by mass or more. Further, the content is preferably 2 parts by mass or less, particularly preferably 1 part by mass or less, and further preferably 0.5 parts by mass or less.

(1-6) Gel fraction In the pressure-sensitive adhesive sheet roll 1 according to this embodiment, the gel fraction of the acrylic pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is preferably 30% or more, and 40% or more. It is more preferable that it is 45% or more. Here, when the adhesive layer 12 is active energy ray-curable, the gel fraction mentioned here refers to the gel fraction before the adhesive layer 12 is irradiated with active energy rays. When the lower limit value of the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is as described above, the cohesive force of the pressure-sensitive adhesive is increased, and the step following property under high-temperature and high-humidity conditions is further improved. In particular, when the pressure-sensitive adhesive layer 12 is active energy ray-curable, the pressure-sensitive adhesive layer 12 is cured by irradiation with active energy rays, and the cohesive force is further increased. The property is further improved.

  Moreover, the gel fraction of the acrylic pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 is preferably 80% or less, particularly preferably 70% or less, and further preferably 60% or less. When the upper limit value of the gel fraction is as described above, the pressure-sensitive adhesive does not become too hard, and the initial level-step following property is more excellent. Here, the measuring method of the gel fraction of acrylic adhesive (before active energy ray irradiation) is as showing in the test example mentioned later.

  In the pressure-sensitive adhesive sheet roll 1 according to this embodiment, when the pressure-sensitive adhesive layer 12 is active energy ray-curable, the gel fraction of the acrylic pressure-sensitive adhesive obtained by curing the pressure-sensitive adhesive layer 12 by irradiation with active energy rays. Is preferably 40% or more, particularly preferably 55% or more, and more preferably 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 value of the gel fraction after curing is the above, the step following property under high temperature and high humidity conditions becomes more excellent.

  When the pressure-sensitive adhesive layer 12 is active energy ray curable, the gel fraction of the acrylic pressure-sensitive adhesive obtained by curing the pressure-sensitive adhesive layer 12 by irradiation with active energy rays is preferably 90% or less. In particular, it is preferably 80% or less, and more preferably 70% or less. It can prevent that the adhesive force of the adhesive layer 12 after hardening falls, and durability deteriorates that the upper limit of the gel fraction after hardening is the above. The method for measuring the gel fraction of the above-mentioned cured acrylic pressure-sensitive adhesive (after irradiation with active energy rays) is as shown in the test examples described later.

  In addition, when the pressure-sensitive adhesive layer 12 is active energy ray-curable, the gel fraction after the active energy ray curing is improved in cohesion as compared with the gel fraction before the active energy ray curing of the pressure-sensitive adhesive layer 12. From the viewpoint of ensuring the step following performance under the durability condition, it is preferably increased by 5 points or more, particularly preferably increased by 10 points or more, more preferably increased by 15 points or more. . Further, from the viewpoint of securing the adhesive force after curing the active energy ray and ensuring the step following property under the durability condition, the above-described increase in the gel fraction is preferably suppressed to 35 points or less, particularly 30 points or less. It is preferable to be suppressed, and further it is preferable to be suppressed to 25 points or less.

(1-7) Production of Adhesive Composition Adhesive composition P produced (meth) acrylic acid ester copolymer (A), and obtained (meth) acrylic acid ester copolymer (A). If desired, it can be produced by mixing a crosslinking agent (B), an active energy ray-curable component (C), a photopolymerization initiator (D), and an additive.

  The (meth) acrylic acid ester copolymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer by an ordinary radical polymerization method. The polymerization of the (meth) acrylic acid ester copolymer (A) is preferably carried out by a solution polymerization method using a polymerization initiator if desired. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, and the like. Two or more kinds may be used in combination.

  Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more kinds may be used in combination. Examples of the azo compound include 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 1,1′-azobis (cyclohexane 1-carbonitrile), 2 , 2′-azobis (2,4-dimethylvaleronitrile), 2,2′-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2′-azobis (2-methylpropionate) 4,4′-azobis (4-cyanovaleric acid), 2,2′-azobis (2-hydroxymethylpropionitrile), 2,2′-azobis [2- (2-imidazolin-2-yl) Propane] and the like.

  Examples of organic peroxides include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, and di (2-ethoxyethyl) peroxy. Examples include dicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxybivalate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide and the like.

  In addition, 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, the solution of the (meth) acrylic acid ester copolymer (A) is optionally mixed with a crosslinking agent (B) and an active energy ray-curable component (C ), A photopolymerization initiator (D), an additive, and a diluting solvent are added and mixed thoroughly to obtain an adhesive composition P (coating solution) diluted with the solvent. When any of the above components is used in a solid state or when precipitation occurs when mixed with other components in an undiluted state, the component is used alone as a dilution solvent. It may be dissolved or diluted and then mixed with other components.

  Examples of the dilution 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, Alcohols such as 1-methoxy-2-propanol, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone, and cyclohexanone, esters such as ethyl acetate and butyl acetate, and cellosolve solvents such as ethyl cellosolve are used.

  The concentration / viscosity of the coating solution thus prepared is not particularly limited as long as it can be coated, and can be appropriately selected depending on the situation. For example, it dilutes so that the density | concentration of the adhesive composition P may be 10-60 mass%. In addition, when obtaining a coating solution, addition of a dilution solvent etc. is not a necessary condition, and if a viscosity etc. which can be coated with the adhesive composition P are not necessary, a dilution solvent does not need to be added. In this case, the adhesive composition P becomes a coating solution using the polymerization solvent of the (meth) acrylic acid ester copolymer (A) as a dilution solvent.

(2) First film The first film 11 may be a desired base material to be attached to an adherend via the pressure-sensitive adhesive layer 12, or a release sheet as described later. The material of the first film 11 is not particularly limited. The first film 11 may be composed of a resin-based sheet whose main component is a resin-based material, or may be composed of a paper-based material.

  As the resin component relating to the resin-based sheet, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, ethylene-norbornene copolymer, polyolefin such as norbornene resin, polyester such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, Examples thereof include resins such as polyvinyl chloride, vinyl chloride copolymer, polyimide, polyetherimide, polycarbonate, polyphenylene sulfide, and liquid crystal polymer. These resin sheets may be a sheet composed of a single layer, or may be a sheet in which a plurality of layers of the same type or different types are laminated. 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 a paper base such as glassine paper, coated paper, and high-quality paper, and a thermoplastic resin such as polyethylene laminated on the paper base. Laminated paper is mentioned.

  It is preferable that the 1st film 11 is a peeling sheet by which the peeling process is given to the single side | surface (especially surface which touches the adhesive layer 12) of the sheet | seat consisting of the resin-type sheet | seat or paper-type material mentioned above. Examples of the release agent used for the release treatment include alkyd, silicone, fluorine, unsaturated polyester, polyolefin, and wax release agents.

  The thickness of the first film 11 in the present embodiment is preferably 50 μm or more, particularly preferably 75 μm or more, and more preferably 125 μm or more from the viewpoint of further suppressing the generation of wrinkles. The thickness of the first film 11 is preferably 1000 μm or less, particularly preferably 500 μm or less, and more preferably 250 μm or less. When the upper limit of the thickness of the first film 11 is not more than the above, the pressure-sensitive adhesive sheet 10 is excellent in rollability.

  The first film 11 may have a thickness equal to that of the second film 13. Alternatively, the first film 11 may be thicker than the second film 13. In particular, when the first film 11 has a thickness greater than that of the second film 13, the pressure-sensitive adhesive sheet 10 in which the generation of wrinkles is effectively suppressed can be fed out.

  The Young's modulus at 23 ° C. of the first film 11 is preferably 0.01 GPa or more, particularly preferably 0.1 GPa or more, and more preferably 1 GPa or more. The Young's modulus is preferably 20 GPa or less, particularly preferably 10 GPa or less, and more preferably 8 GPa or less. When the Young's modulus at 23 ° C. of the first film 11 is 0.01 GPa or more, the first film 11 has a predetermined strength, and the pressure-sensitive adhesive layer 12 easily satisfies the above-described conditions regarding the low film thickness portion. It becomes. In addition, since the Young's modulus at 23 ° C. of the first film 11 is 20 GPa or less, the first film 11 is suppressed from having excessive rigidity, and the pressure-sensitive adhesive sheet 10 is easily wound. The pressure-sensitive 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 second film 13 may be a desired base material to be attached to an adherend via the pressure-sensitive adhesive layer 12, or a release sheet as described later. The material constituting the second film 13 may be the same as that of the first film 11. Moreover, when the 2nd film 13 becomes a peeling sheet, it may be the structure similar to the 1st film 11 as a peeling sheet.

  The thickness of the second film 13 is preferably 2 μm or more, particularly preferably 5 μm or more, and more preferably 25 μm or more. The thickness of the second film 13 is preferably 200 μm or less, more preferably 150 μm or less, particularly preferably 90 μm or less, and further preferably 60 μm or less. When the thickness of the second film 13 is in the above-described range, the pressure-sensitive adhesive sheet 10 is excellent in handleability.

  The Young's modulus at 23 ° C. of the second film 13 is preferably 0.01 GPa or more, particularly preferably 0.1 GPa or more, and more preferably 1 GPa or more. The Young's modulus is preferably 10 GPa or less, particularly preferably 8 GPa or less, and further preferably 5 GPa or less. When the Young's modulus at 23 ° C. of the second film 13 is 0.01 GPa or more, the second film 13 has a predetermined strength. When the second film 13 is, for example, a release sheet, the second film 13 When peeling 13 from the adhesive layer 12, it becomes easy to peel off. Moreover, it is suppressed that the 2nd film 13 becomes what has excessive rigidity because the Young's modulus in 23 degreeC of the 2nd film 13 is 10 GPa or less, and suppresses generation | occurrence | production of the wrinkle by winding effectively. 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) Core material The core material 20 in this embodiment has a columnar shape or a cylindrical shape. The diameter of the core material 20 in the present embodiment is preferably 9 cm or more, particularly preferably 10 cm or more, and further preferably 15 cm or more. When the diameter of the core material 20 is 9 cm or more, the pressure-sensitive adhesive layer 12 easily satisfies the above-described conditions regarding the low-thickness portion. Further, the diameter of the core member 20 is preferably 100 cm or less, particularly preferably 50 cm or less, and further preferably 40 cm or less. When the diameter of the core material 20 is 100 cm or less, it is easy to sufficiently increase the number of turns of the pressure-sensitive adhesive sheet 10.

  In addition, the length of the core member 20 in this embodiment (the length in the rotation axis direction when the pressure-sensitive adhesive sheet 10 is wound) is not particularly limited, but is the same as the width of the pressure-sensitive adhesive sheet 10 or from the width. Is also preferably large.

  The material which comprises the core material 20 will not be restrict | limited especially if it has sufficient intensity | strength for winding the adhesive sheet 10, A conventionally well-known thing can be used. Examples of the material include metal, resin, and wood. Among these materials, resins are preferable, and polypropylene is particularly preferable.

  The Young's modulus at 23 ° C. of the core material 20 is preferably 0.1 GPa or more, particularly preferably 0.2 GPa or more, and more preferably 0.5 GPa or more. The Young's modulus is preferably 500 GPa or less, more preferably 250 GPa or less, particularly preferably 200 GPa or less, and further preferably 1 GPa or less. Since the Young's modulus at 23 ° C. of the core material 20 is within the above range, the core material 20 can be favorably maintained even when the winding pressure of the pressure-sensitive adhesive sheet 10 is applied to the core material 20. . In addition, the Young's modulus at 23 degreeC of the core material 20 mentioned above shall say what was measured based on JISZ2241: 2011.

(5) Others The length of the pressure-sensitive adhesive sheet 10 (the length in the feeding direction when the pressure-sensitive adhesive sheet 10 is fed out from the pressure-sensitive adhesive sheet roll 1) may be 1 m or more, and particularly 200 m or more. . It has been found by the present inventors that when the pressure-sensitive adhesive sheet 10 has a length of 1 m or more, the aforementioned wrinkles are likely to occur. However, according to the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, the occurrence of wrinkles can be effectively suppressed even in such a case. In addition, about the upper limit of the length of the adhesive sheet 10, it does not specifically limit, It can set to required length, also considering the handleability of the adhesive sheet winding body 1. FIG.

  In the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, the number of turns of the pressure-sensitive adhesive sheet 10 may be three or more, particularly 10 or more. It has been found by the present inventors that the pressure-sensitive adhesive sheet 10 fed out from the pressure-sensitive adhesive sheet roll 1 tends to have wrinkles when the number of turns is three or more. However, according to the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, even if the number of windings is three or more, the above-described wrinkle generation can be effectively suppressed. The upper limit of the number of turns is not particularly limited, and can be appropriately set from the viewpoint of the required length and amount of the pressure-sensitive adhesive sheet 10 and the handleability of the pressure-sensitive adhesive sheet roll 1.

2. Manufacturing method of pressure-sensitive adhesive sheet roll body The manufacturing method of the pressure-sensitive adhesive sheet roll body 10 according to the present embodiment is particularly limited as long as the pressure-sensitive adhesive layer 12 that satisfies the conditions for the low-thickness portion can be formed. Instead, a conventionally known method can be employed.

  First, as an example of the method for producing the pressure-sensitive adhesive sheet 10 in the present embodiment, first, the surface of the first film 11 has been described above on one surface (the surface subjected to the separation treatment when the separation treatment is performed). A coating solution of the adhesive composition P is applied. The obtained coating film is heat-treated to thermally crosslink the pressure-sensitive adhesive composition P to form the pressure-sensitive adhesive layer 12. Then, the adhesive film 12 is laminated by laminating one surface of the second film 13 (the surface subjected to the peeling treatment when the peeling treatment is performed) on the surface opposite to the first film 11 in the pressure-sensitive adhesive layer 12. A sheet 10 can be formed. You may cure the adhesive layer 12 as needed. In this manufacturing method, the first film 11 and the second film 13 may be interchanged.

  For example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, or a gravure coating method can be used as a method for applying the coating solution of the adhesive composition P. In particular, when producing the pressure-sensitive adhesive sheet 10 in the present embodiment, the coater used for applying the above-described coating solution is appropriately selected, and the coating speed and the positional relationship (angle and distance) between the coater and the first film 11 are selected. By appropriately adjusting the above, it becomes easy to form the pressure-sensitive adhesive layer 12 having no low-thickness portion or the pressure-sensitive adhesive layer 12 having a low-thickness portion under the above-described conditions. Examples of preferable coaters include a slot die coater, a lip coater, a roll knife coater, a curtain coater and the like, and among them, a slot die coater is preferable. When the slot die coater is used, it is easy to form the pressure-sensitive adhesive layer 12 that satisfies the above-described conditions regarding the low-thickness portion by appropriately adjusting the slot gap.

  Further, when it is difficult to form the pressure-sensitive adhesive layer 12 having a desired thickness by a single application of the coating solution as described above, a laminate formed by forming a pressure-sensitive adhesive layer on the process sheet The body is produced, and the surface on the pressure-sensitive adhesive layer side in the laminate and the surface on the pressure-sensitive adhesive layer side in the laminate of the first film 11 and the pressure-sensitive adhesive layer produced as described above are bonded, The pressure-sensitive adhesive layer 12 having a desired thickness may be formed. In this case, the adhesive sheet 10 can be obtained by bonding the second film 13 to the exposed surface of the adhesive layer 12 that is exposed by peeling the process sheet. Or the laminated body formed by forming an adhesive layer in the single side | surface of the 2nd film 13 (the said peeling-processed surface, when peeling-processed) is produced, and the surface by the side of the adhesive layer in the said laminated body And at the same time as forming the pressure-sensitive adhesive layer 12 having a desired thickness by bonding the surface on the pressure-sensitive adhesive layer side in the laminate of the first film 11 and the pressure-sensitive adhesive layer produced as described above, You may obtain the adhesive sheet 10 in which the 1st film 11, 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 and the second film 13, the first film 11, the laminate of the second film 13 and the pressure-sensitive adhesive layer, or the first Tension may be applied to at least one of the first film 11 and the second film 13 when laminating the laminate of the film 11 and the pressure-sensitive adhesive layer and the laminate of the second film 13 and the pressure-sensitive adhesive layer. .

  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 more preferably 100 N / m or more. The tension is preferably 1000 N / m or less, particularly preferably 800 N / m or less, and more preferably 500 N / m or less.

  Moreover, when applying tension to the second film 13, the tension is preferably 1 N / m or more, particularly preferably 10 N / m or more, and more preferably 50 N / m or more. The tension is preferably 800 N / m or less, particularly preferably 600 N / m or less, and more preferably 400 N / m or less.

  When tension is applied to both the first film 11 and the second film 13, it is preferable to apply a greater tension to the first film 11 that is on the inner side when the pressure-sensitive adhesive sheet 10 is wound. Accordingly, in the pressure-sensitive adhesive sheet 10 after being released from the tension, the warp with the first film 11 side inside tends to occur, and as a result, the wrinkle in the pressure-sensitive adhesive sheet 10 fed out from the pressure-sensitive adhesive sheet roll 1 is obtained. Can be more effectively suppressed. From such a viewpoint, the ratio of the tension applied to the first film 11 with respect to the tension applied to the second film 13 is preferably 1.0 times or more, particularly preferably 1.2 times or more, Further, it is preferably 1.8 times or more. The upper limit of the ratio is not particularly limited, but is about 5 times or less.

  The pressure-sensitive adhesive sheet wound body 1 is obtained by winding the pressure-sensitive adhesive sheet 10 manufactured as described above around the core material 20. In the winding, the pressure-sensitive adhesive sheet 10 is wound around the core material 20 so that the surface of the pressure-sensitive adhesive sheet 10 on the first film 11 side is inside. In addition, you may perform manufacture of the adhesive sheet 10 and winding of the manufactured adhesive sheet 10 continuously. That is, the first film 11, the pressure-sensitive adhesive layer 12, and the second film 13 are laminated upstream in the flow direction, and the pressure-sensitive adhesive sheet 10 wound after the lamination is completed downstream in the flow direction. Times may be performed.

  During the winding described above, a tension may be applied to the pressure-sensitive adhesive sheet 10. The tension is preferably 10 N / m or more, particularly preferably 50 N / m or more, and more preferably 100 N / m or more. The tension is preferably 1000 N / m or less, particularly preferably 800 N / m or less, and more preferably 500 N / m or less. By winding the pressure-sensitive adhesive sheet 10 while applying the tension in the above-described range, it is easy to manufacture the pressure-sensitive adhesive sheet wound body 1 that is wound uniformly without any slack.

3. Usage method of pressure-sensitive adhesive sheet roll The pressure-sensitive adhesive sheet roll 1 according to this embodiment can use the fed pressure-sensitive adhesive sheet 10 for a desired application. In the pressure-sensitive adhesive sheet roll 1 according to the present embodiment, the pressure-sensitive adhesive layer 12 has a relatively thick thickness of 100 μm or more. Therefore, the pressure-sensitive adhesive sheet 10 in the present embodiment is preferably used for applications where such a relatively thick pressure-sensitive 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 display body includes a first display body constituent member having a step on at least a surface to be bonded, a second display body constituent member (another display body constituent member), and a position between them. The pressure-sensitive adhesive layer 12 in this embodiment is cured and configured. Here, the level difference is, for example, a level difference due to a frame-like printed layer provided on the surface of the first display member constituting member in plan view.

  When manufacturing the said display body, first, either the 1st film 11 and the 2nd film 13 are peeled from the adhesive sheet 10 in this embodiment, and the adhesive surface of the exposed adhesive layer 12 is made into 1st. Affixed to the surface of the display member constituting member having a step. At this time, it sticks so that the adhesive layer 12 may follow the said level | step difference favorably. Next, the remaining one of the first film 11 and the second film 13 is peeled off from the pressure-sensitive adhesive layer 12, and the exposed pressure-sensitive adhesive surface of the pressure-sensitive adhesive layer 12 and the second display member constituting member are bonded together. As described above, when the pressure-sensitive adhesive layer 12 is composed of an active energy ray-curable acrylic pressure-sensitive adhesive and has not yet been cured with active energy rays, the first display body configuration The adhesive layer 12 is irradiated with an active energy ray through at least one of the member and the second display member constituting member, and the adhesive layer 12 is cured. Thus, a display body can be obtained.

  The first display member constituting member may be a plastic plate, a glass plate or the like having a frame-like printed layer in a plan view, or a protective panel made of a laminate including the glass plate or the plastic plate. There may be. The second display body constituent member is an optical member to be attached to the first display body constituent member, a display body module, an optical member as a part of the display body module, or a laminate including the display body module. Also good.

  The active energy rays irradiated to the pressure-sensitive adhesive layer 12 have energy quanta in electromagnetic waves or charged particle beams, and specifically include ultraviolet rays and electron beams. Among active energy rays, ultraviolet rays that are easy to handle are particularly preferable.

Irradiation of the ultraviolet rays, a high-pressure mercury lamp, a fusion H lamp, can be carried out by a xenon lamp or the like, the dose of ultraviolet ray is illuminance 50 mW / cm ² or more, and preferably 1000 mW / cm ² or less. Quantity of ultraviolet light is preferably at 50 mJ / cm ² or more, more preferably 80 mJ / cm ² or more, and particularly preferably 200 mJ / cm ² or more. Further, the amount of ultraviolet rays is preferably 10000 mJ / cm ² or less, more preferably 5000 mJ / cm ² or less, particularly preferably 2000 mJ / cm ² or less. On the other hand, the electron beam irradiation can be performed by an electron beam accelerator or the like, and the electron beam irradiation amount is preferably 10 krad or more and 1000 krad or less.

  As described above, the adhesive layer 12 composed of an active energy ray-curable acrylic adhesive is pasted on the first display member constituting member having a step, and then the active energy ray is irradiated to the adhesive layer 12. When the adhesive layer 12 is cured, the cohesive force of the adhesive layer 12 is improved in a state where the adhesive layer 12 follows the step well. Thereby, even when the pressure-sensitive adhesive layer 12 is affixed to the adherend and placed under high temperature and high humidity conditions, it is possible to satisfactorily suppress the occurrence of bubbles, floats, peeling, etc. in the vicinity of the steps. It will be possible.

  The embodiment described above is described for facilitating understanding of the present invention, and is 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.

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

[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-acryloylmorpholine (N-acryloylmorpholine), 10 parts by mass of isobornyl acrylate and 2-hydroxyethyl acrylate 15 parts by mass were copolymerized by a solution polymerization method 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 method mentioned later, it was weight average molecular weight (Mw) 600,000.

Here, the above-mentioned weight average molecular weight (Mw) is a polystyrene-reduced weight average molecular weight measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).
<Measurement conditions>
GPC measurement device: manufactured by Tosoh Corporation, HLC-8020
GPC column (passed in the following order): TSK guard column HXL-H manufactured by Tosoh Corporation
TSK gel GMHXL (× 2)
TSK gel G2000HXL
・ Measurement solvent: Tetrahydrofuran ・ Measurement temperature: 40 ° C.

2. Preparation of Adhesive Composition 100 parts by mass of the (meth) acrylic acid ester copolymer (A) obtained in Step 1 above (converted to a solid content; the same shall apply hereinafter) and trimethylolpropane modification as a crosslinking agent (B) 0.15 parts by mass of tolylene diisocyanate, 5.0 parts by mass of ε-caprolactone-modified tris- (2-acryloxyethyl) isocyanurate as the active energy ray-curable component (C), and a photopolymerization initiator (D) 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide as 0.5 parts by weight and 0.5 part by weight of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent, By stirring and diluting with methyl ethyl ketone, a coating solution of the adhesive composition was obtained.

3. Manufacture of an adhesive sheet The release sheet (thickness: 75 micrometers) which peel-processed one side of the elongate polyethylene terephthalate film as a 1st film with the silicone type release agent from the coating solution of the adhesive composition obtained at the said process 2. The release treatment surface was coated with a slot die coater. And the obtained coating film was dried by heat-processing at 110 degreeC for 3 minute (s), and the adhesive layer of thickness 100 micrometers and width 1080mm was formed. When applying using a slot die coater, the pressure-sensitive adhesive layer in the finally obtained pressure-sensitive adhesive sheet has a low film thickness portion shown in Table 1 by adjusting the slot gap. I made it. 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 coating solution of the adhesive composition obtained in the above step 2 was a release sheet (product name “SP”, manufactured by Lintec Co., Ltd.) on which one side of a long polyethylene terephthalate film as a process sheet was peeled with a silicone-based release agent. -PET752150 ") was applied to the release-treated surface using a slot die coater. And the obtained coating film was dried by heat-processing at 110 degreeC for 3 minute (s), and the adhesive layer of thickness 100 micrometers and width 1080mm was formed. When applying using a slot die coater, the pressure-sensitive adhesive layer in the finally obtained pressure-sensitive adhesive sheet has a low film thickness portion shown in Table 1 by adjusting the slot gap. I made it. This obtained the 2nd laminated body which consists of a structure of a process sheet / adhesive layer (thickness: 100 micrometers, width: 1080mm).

  Then, the surface at the side of the adhesive layer in the 1st laminated body obtained as mentioned above and the surface at the side of the adhesive layer in the 2nd laminated body obtained as mentioned above were bonded. 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 | seat.

  Next, one side of the long polyethylene terephthalate film as the second film is silicone-based with respect to the exposed surface of the pressure-sensitive adhesive layer exposed by peeling the process sheet from the third laminate obtained as described above. A release treatment surface of a release sheet (thickness: 75 μm) that was release-treated with a release agent was laminated. During the lamination, a tension of 300 N / m was applied to the first film in the length direction, and a tension of 150 N / m was applied to the second film in the length direction. Thereby, the adhesive sheet which consists of a structure of a 1st film / adhesive layer (thickness: 200 micrometers, width | variety: 1080 mm) / 2nd film was obtained.

  In addition, 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, it was less than 0.1%.

4). Production of pressure-sensitive adhesive sheet roll The pressure-sensitive adhesive sheet obtained in the above step 3 was wound around a cylindrical core material (made of polypropylene, Young's modulus: 0.7 GPa) having a diameter (outer diameter) of 179.4 mm. At this time, while winding so that the 1st film side in an adhesive sheet might become an inner side, it wound, applying a tension of 200 N / m to the adhesive sheet in the length direction. Moreover, the length of the wound adhesive sheet was 300 m. Thereby, the adhesive sheet winding body was obtained.

[Example 2]
The adhesive layer in the adhesive sheet finally obtained by adjusting the slot gap of the slot die coater when producing the first laminate and the second laminate is a low-thickness portion shown in Table 1. A pressure-sensitive adhesive sheet roll was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive sheet was changed so as to have the following.

Example 3
When using a release sheet (thickness: 125 μm) obtained by releasing one side of a long polyethylene terephthalate film with a silicone-based release agent as the first film, and producing a first laminate and a second laminate Example 1 except that the pressure-sensitive adhesive layer in the finally obtained pressure-sensitive adhesive sheet was changed to have a low-thickness part shown in Table 1 by adjusting the slot gap of the slot die coater. Similarly, a pressure-sensitive adhesive sheet roll was produced.

Example 4
A solution polymerization method was used to copolymerize 55 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of 4-acryloylmorpholine (N-acryloylmorpholine), 10 parts by mass of isobornyl acrylate, and 25 parts by mass of 2-hydroxyethyl acrylate, A (meth) acrylic acid ester copolymer (A) was prepared. When the molecular weight of this (meth) acrylic acid ester copolymer (A) was measured by the method mentioned above, it was weight average molecular weight (Mw) 600,000. Using this (meth) acrylic acid ester copolymer (A), a coating solution of the pressure-sensitive adhesive composition is prepared, and the pressure-sensitive adhesive layer is formed using the coating solution. By adjusting the slot gap of the slot die coater when producing the laminate of No. 2, the pressure-sensitive adhesive layer in the finally obtained pressure-sensitive adhesive sheet has a low film thickness portion shown in Table 1. A pressure-sensitive adhesive sheet roll was produced in the same manner as in Example 1 except for the change.

Example 5
A cylindrical core material (made of polypropylene, Young's modulus: 0.7 GPa) having a diameter (outer diameter) of 331.8 mm is used, and a slot die coat is used when producing the first laminate and the second laminate. The wound adhesive sheet was made in the same manner as in Example 1 except that the adhesive layer in the finally obtained adhesive sheet was changed so as not to have a low film thickness portion by adjusting the slot gap of the Manufactured.

[Comparative Example 1]
The adhesive layer in the adhesive sheet finally obtained by adjusting the slot gap of the slot die coater when producing the first laminate and the second laminate is a low-thickness portion shown in Table 1. A pressure-sensitive adhesive sheet roll was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive sheet was changed so as to have the following.

[Comparative Example 2]
A solution polymerization method was used to copolymerize 55 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of 4-acryloylmorpholine (N-acryloylmorpholine), 10 parts by mass of isobornyl acrylate, and 25 parts by mass of 2-hydroxyethyl acrylate, A (meth) acrylic acid ester copolymer (A) was prepared. When the molecular weight of this (meth) acrylic acid ester copolymer (A) was measured by the method mentioned above, it was weight average molecular weight (Mw) 600,000. Using this (meth) acrylic acid ester copolymer (A), a coating solution of the pressure-sensitive adhesive composition is prepared, and the pressure-sensitive adhesive layer is formed using the coating solution. By adjusting the slot gap of the slot die coater when producing the laminate of No. 2, the pressure-sensitive adhesive layer in the finally obtained pressure-sensitive adhesive sheet has a low film thickness portion shown in Table 1. A pressure-sensitive adhesive sheet roll was produced in the same manner as in Example 1 except for the change.

[Comparative Example 3]
The adhesive layer in the adhesive sheet finally obtained by adjusting the slot gap of the slot die coater when producing the first laminate and the second laminate is a low-thickness portion shown in Table 1. A pressure-sensitive adhesive sheet roll was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive sheet was changed so as to have the following.

[Test Example 1] (Measurement of Young's modulus of the first film and the second film)
About the first film and the second film used in Examples and Comparative Examples, using a universal tensile tester (Orientec Co., Ltd., product name “Tensilon RTA-T-2M”), according to JIS K7161: 2014 The Young's modulus was measured under the conditions of a tensile speed of 200 mm / min in an environment of 23 ° C. and 50% RH. The results are shown in Table 1.

[Test Example 2] (Measurement of storage elastic modulus of adhesive layer)
A plurality of pressure-sensitive adhesive layers prepared in Examples and Comparative Examples were laminated to form a laminate having a thickness of 3 mm. A cylindrical body (height 3 mm) having a diameter of 8 mm was punched out from the obtained laminate of the pressure-sensitive adhesive layer, and this was used as a sample.

About the said sample, based on JISK7244-6: 1999, the storage elastic modulus (G ') (G') under the following conditions is obtained by the torsional shear method using a viscoelasticity measuring device (manufactured by REOMETRIC, product name "DYNAMIC ANALYZER"). MPa). The results are shown in Table 1.
Measurement frequency: 1Hz
Measurement temperature: 23 ° C

[Test Example 3] (Measurement of variation in thickness of adhesive layer)
A pressure-sensitive adhesive sheet was fed out from the pressure-sensitive adhesive sheet roll obtained in Examples 1 to 5 and Comparative Examples 1 and 2, and cut in parallel with the width direction to obtain a measurement sample having a size of 108 cm × 100 cm. And the 1st film and the 2nd film were peeled from the said measurement sample, and the thickness in one point of a substantially center was measured in the remaining adhesive layer. For this measurement, a J-type digital indicator manufactured by Teclock was used.

  Further, nine measurement samples were obtained in the same manner as described above, and the thickness at one point at approximately the center of each pressure-sensitive adhesive layer was measured in the same manner as described above.

  Moreover, the measurement sample was obtained from the adhesive sheet winding body obtained in Comparative Example 3 in the same manner as described above. About the adhesive sheet winding body which concerns on the comparative example 3, according to the result of the test example 5 mentioned later, since the center part is a low film thickness part, it is the same as the above in one point 300 mm away from the center to one side The thickness was measured for 10 measurement samples.

The maximum thickness (T _max ) and the minimum thickness (T _min ) are determined from the ten measurement results obtained as described above, and the average thickness of the ten measurement results (T _AVE ) was calculated. Then, variation 1 (%) and variation 2 (%) are calculated from the obtained formula (1) and formula (2), respectively, and the larger one of these values is the thickness of the pressure-sensitive adhesive layer. Variation (%). The results are shown in Table 1.
Variation 1 (%) = {(T _max −T _AVE ) / T _AVE } × 100 (1)
Variation 2 (%) = {(T _AVE −T _min ) / T _AVE } × 100 (2)

[Test Example 4] (Measurement of gel fraction)
The pressure-sensitive adhesive sheet is drawn out from the pressure-sensitive adhesive sheet roll obtained in Examples and Comparative Examples, cut into a size of 80 mm × 80 mm, the pressure-sensitive adhesive layer is wrapped in a polyester mesh (mesh size 200), and the mass is precisely measured. The mass of only the adhesive was calculated by weighing with a balance and subtracting the mass of the mesh alone. The mass at this time is M1.

  Next, the pressure-sensitive adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23 ° C.) for 24 hours. Thereafter, the pressure-sensitive adhesive was taken out, air-dried for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50%, and further dried in an oven at 80 ° C. for 12 hours. After drying, the mass was weighed with a precision balance, and the mass of the pressure sensitive adhesive alone was calculated by subtracting the mass of the mesh alone. The mass at this time is M2. The gel fraction (%) is represented by (M2 / M1) × 100. This derived | led-out the gel fraction (before UV irradiation) of an adhesive. The results are shown in Table 1.

  In addition, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet cut in the same manner as described above was irradiated with ultraviolet rays (UV) under the following conditions through the first film to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing. . About the adhesive of this adhesive layer after hardening, the gel fraction (after UV irradiation) was derived | led-out similarly to the above. The results are shown in Table 1.

<Ultraviolet irradiation conditions>
・ Use high pressure mercury lamp ・ Illuminance 200mW / cm ² , Light quantity 1000mJ / cm ²
・ Uses UVGraph-A1 made by Eye Graphics as UV illuminance / light meter

[Test Example 5] (Measurement of low film thickness portion)
About the pressure-sensitive adhesive sheets prepared in Examples and Comparative Examples, the thickness of the pressure-sensitive adhesive layer at a position of 10 m in the length direction from the end portion that becomes the core material side when wound out of the length-direction end portions, It measured using the constant-pressure thickness measuring device (The product name "PG-201" by a Teclock company). At this time, it measured over the whole width direction of an adhesive layer. And the width | variety (mm) in the width direction of an adhesive layer was measured about the low film thickness part which has a thickness 2 micrometers or more thinner than the measured maximum thickness. The results are shown in Table 1. In Table 1, the width of the low-thickness portion existing in the center portion in the width direction of the pressure-sensitive adhesive layer and the width of the low-thickness portion located at the end portion in the width direction of the pressure-sensitive adhesive layer are described separately. did. 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 width direction of an adhesive layer The average value with the width | variety of the low film thickness part located in the other end side 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 (1080 mm) of an adhesive layer was computed. The results are shown in Table 1.

[Test Example 6] (Evaluation of step following ability)
On the surface of a glass plate (manufactured by NSG Precision, product name “Corning Glass Eagle XG”, length 90 mm × width 50 mm × thickness 0.5 mm), UV curable ink (product name “POS-911 Black”, manufactured by Teikoku Ink Co., Ltd.) ) Was screen-printed in a frame shape (outside: vertical 90 mm × width 50 mm, width 5 mm) so that the coating thickness was 10 μm. Next, irradiation with ultraviolet rays (80 W / cm ² , ^two metal halide lamps, lamp height of 15 cm, belt speed of 10 to 15 m / min) is performed to cure the printed ultraviolet curable ink, and a level difference due to printing (level difference) A stepped glass plate having a thickness of 10 μm) was produced.

  The second film was peeled off from the pressure-sensitive adhesive sheets prepared in Examples and Comparative Examples, and the exposed pressure-sensitive adhesive layer was replaced with a polyethylene terephthalate (PET) film (product name “PET A4300” manufactured by Toyobo Co., Ltd., thickness: 100 μm) easy adhesion layer. Next, the first film is peeled off to expose the pressure-sensitive adhesive layer, and using a laminator (product name “LPD3214”, manufactured by Fuji Plastics Co., Ltd.), each stepped glass plate so that the pressure-sensitive adhesive layer covers the entire frame-shaped printing surface. Laminated. Then, it was autoclaved for 30 minutes under the conditions of 50 ° C. and 0.5 MPa, and left at normal pressure, 23 ° C. and 50% RH for 24 hours. Subsequently, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays through the PET film under the same conditions as in Test Example 4 to cure the pressure-sensitive adhesive layer.

And it stored for 72 hours under the high-temperature, high-humidity conditions of 85 degreeC and 85% RH (endurance test). Thereafter, the presence or absence of bubbles, floats, and peeling at the interface between the printed step and the cured pressure-sensitive adhesive layer was visually confirmed, and the step following ability was evaluated based on the following criteria.
◯: Bubbles, floats and peeling did not occur.
X: At least one of bubbles, floating and peeling occurred.

[Test Example 7] (Evaluation of appearance of adhesive sheet)
7 days after production, the adhesive sheet is fed out from the wound adhesive sheet roll obtained in the examples and comparative examples, and the occurrence of appearance abnormalities such as folding wrinkles and distortion wrinkles is visually observed at a position 10 m from the end on the core side. Confirmed. And the width | variety (mm) in the width direction of the adhesive layer about the said external appearance abnormality was measured. The results are shown in Table 1. In Table 1, the width of the appearance abnormality that occurred at the central portion in the width direction of the pressure-sensitive adhesive layer and the width of the appearance abnormality that occurred at the end portion in the width direction of the pressure-sensitive adhesive layer are shown separately. Moreover, about the width | variety of the appearance abnormality which occurred in the edge part of the width direction of an adhesive layer, the width | variety of the appearance abnormality which occurred in the one end side of the width direction of an adhesive layer, and the other end side of the width direction of an adhesive layer The average value with the width | variety of the appearance abnormality which arose was described.

  Furthermore, the total ratio of the width of the appearance abnormality measured as described above with respect to the total width (1080 mm) of the pressure-sensitive adhesive layer is calculated, and the ratio (%) in the width direction of the appearance abnormality is shown in Table 1.

  In addition, the adhesive sheet was all fed out from the wound adhesive sheet roll obtained in Examples and Comparative Examples after 7 days from the production, and the occurrence of appearance abnormalities such as wrinkles and wrinkles was visually confirmed over the entire length (300 m). did. And the length (m) in the length direction of the adhesive sheet about the said external appearance abnormality was measured. The results are shown in Table 1. In Table 1, the length (m) for the appearance abnormality at the end portion in the width direction of the pressure-sensitive adhesive layer and the length (m) for the appearance abnormality at the center portion in the width direction of the pressure-sensitive adhesive layer are divided. It was described.

Furthermore, the external appearance of the adhesive sheet was evaluated based on the following criteria. The results are shown in Table 1.
A: The ratio (%) in the width direction of the appearance abnormality is less than 7%.
A: Ratio (%) in the width direction of appearance abnormality is 7% or more and less than 10%.
(Triangle | delta): The ratio (%) of the width direction of an appearance abnormality is 10% or more and less than 15%.
X: The ratio (%) in the width direction of the appearance abnormality is 15% or more.

  As can be seen from Table 1, the pressure-sensitive adhesive sheet roll obtained in the Examples was able to pay out a pressure-sensitive adhesive sheet having an excellent appearance.

  The pressure-sensitive adhesive sheet roll of the present invention can be suitably used, for example, for producing a display body (display).

DESCRIPTION OF SYMBOLS 1 ... Adhesive sheet winding body 10 ... Adhesive sheet 11 ... 1st film 12 ... Adhesive layer 13 ... 2nd film 20 ... Core material

Claims (8)

A long film comprising a first film, a pressure-sensitive adhesive layer laminated on one side of the first film, and a second film laminated on the surface of the pressure-sensitive adhesive layer opposite to the first film. The pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet wound body wound around a columnar or cylindrical core member with the surface on the first film side inside,
The pressure-sensitive adhesive layer is composed of an acrylic pressure-sensitive adhesive,
The thickness of the pressure-sensitive adhesive layer is 100 μm or more and 1000 μm or less,
Satisfying the following condition A or condition B Condition A: In the width direction of the pressure-sensitive adhesive layer, there is no low film thickness portion 2 μm or thinner than the maximum thickness of the pressure-sensitive adhesive layer in the width direction;
Condition B: The low film thickness portion exists only in a region within 10% of the entire width from both ends in the width direction of the pressure-sensitive adhesive layer, and the total width of the low film thickness portion is that of the pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet roll is 10% or less of the entire width.   The pressure-sensitive adhesive sheet roll according to claim 1, wherein at least one of the first film and the second film is a release film.   The pressure-sensitive adhesive sheet roll according to claim 1 or 2, wherein the thickness of the first film is equal to the thickness of the second film or thicker than the thickness of the second film.   The pressure-sensitive adhesive sheet roll according to any one of claims 1 to 3, wherein a storage elastic modulus at 23 ° C of the pressure-sensitive adhesive layer is 0.001 MPa or more and 5 MPa or less.   The pressure-sensitive adhesive sheet roll according to any one of claims 1 to 4, wherein a gel fraction of the acrylic pressure-sensitive adhesive is 30% or more and 80% or less.   The pressure-sensitive adhesive sheet roll according to any one of claims 1 to 5, wherein a variation in film thickness of the pressure-sensitive adhesive layer is less than 2%.   The Young's modulus at 23 ° C of the first film is 0.01 GPa or more and 20 GPa or less, The pressure-sensitive adhesive sheet roll according to any one of claims 1 to 6.   The pressure-sensitive adhesive sheet roll according to any one of claims 1 to 7, wherein the number of turns of the pressure-sensitive adhesive sheet is 3 or more.

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