JP2019065189A - Pressure sensitive adhesive tape - Google Patents

Abstract

To provide a pressure sensitive adhesive tape suitably used when an adherend such as a carpet of an aircraft is fixed to an aircraft body, capable of easily conducting position adjustment of the adherend during fixing operations, and exhibiting good adhesive force to the adherend after fixing.SOLUTION: The pressure sensitive adhesive tape has a non-adhesive masking member on at least one surface of an acrylic pressure sensitive adhesive layer, having tensile storage elastic modulus of the pressure sensitive adhesive layer at 23°C of 5.0×10to 1.0×10Pa, a percentage of an area of a part of a surface of the pressure sensitive adhesive layer covered by the non-adhesive masking member of 5 to 11%, and percentage of minimum height from the surface of the pressure sensitive adhesive layer to the non-adhesive masking member based on thickness of the pressure sensitive adhesive layer is 14 to 50%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pressure sensitive adhesive tape.

  Adhesive tapes and adhesive tapes are easier to construct than adhesives and are superior in construction speed, and are used in various fields such as construction materials such as mortars, and fiber materials such as electronic devices, textiles, and knits. It is done. In particular, building materials and fiber materials often have rough surfaces, and in these applications, the ability to conform to rough surfaces and adhesion are improved by providing an adhesive layer on the substrate. . In addition to high adhesion, in general, adhesive tapes used for building materials and interior materials for transportation fields such as automobiles, aircrafts and railway vehicles are also required to have excellent flame retardancy.

  With regard to interior materials in the transportation field, in recent years, it has been considered to use a double-sided adhesive tape when securing a member such as an aircraft carpet to an aircraft frame. Since members such as carpets are regularly replaced, they have sufficient adhesiveness when using carpets, but they can be easily peeled off when carpets are replaced, and they can be detached from the aircraft housing etc. There is a demand for an adhesive tape that does not cause adhesive residue on the adherend side.

  For example, Patent Document 1 has a pressure-sensitive adhesive layer on both sides of a base having hand-cutting properties, the ratio of the adhesive strength of both pressure-sensitive adhesive layers is in a predetermined range, and a predetermined flammability test standard. A double sided adhesive tape is disclosed that meets. The double-sided pressure-sensitive adhesive tape is excellent in hand-kneading, flame retardancy and releasability in a well-balanced manner, and is suitable for use in fixing aircraft members such as aircraft carpets. The double-sided pressure-sensitive adhesive tape described in Patent Document 1 is suitably used for laminating a floor material of an aircraft and a carpet, and the pressure-sensitive adhesive of the surface to be attached to the carpet side is very high and the surface to be attached to the floor side It is stated that it is preferable that the pressure-sensitive adhesive adheres to the floor surface appropriately and can be peeled off without adhesive residue at the time of carpet replacement.

JP, 2015-143353, A

  When securing a carpet of an aircraft to an aircraft housing using a double-sided adhesive tape, it is preferable that the carpet can be easily positioned during the securing operation so as to be able to cope with a positional deviation. However, if the adhesion between the carpet and the pressure-sensitive adhesive on the surface of the double-sided pressure-sensitive adhesive tape on the side of the carpet is too strong, it becomes difficult to adjust the position of the carpet and the workability is lowered. Although the double-sided pressure-sensitive adhesive tape described in Patent Document 1 has the ability to fix the carpet of an aircraft, the ease of adjusting the position of the carpet has not been studied.

  The present invention has been made in view of the above problems, and is suitably used, for example, when fixing an adherend such as a carpet of an aircraft to an aircraft casing, and facilitates position adjustment of the adherend at the time of fixing operation. It is an object of the present invention to provide a pressure-sensitive adhesive tape which can be carried out and which exhibits good adhesion to an adherend after fixation.

The present inventors have found that the above-mentioned problems can be solved by using a pressure-sensitive adhesive tape having a predetermined configuration provided with a non-adhesive masking member on at least one surface of an acrylic pressure-sensitive adhesive layer. Completed the invention of
[1] A non-adhesive masking member is provided on at least one surface of the acrylic pressure-sensitive adhesive layer, and the tensile storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer is 5.0 × 10 ^{4 to} 1.0 X 10 ⁷ Pa, the ratio of the area of the surface of the pressure-sensitive adhesive layer covered with the non-adhesive masking member is 5 to 11%, and the thickness of the pressure-sensitive adhesive layer The pressure-sensitive adhesive tape, wherein the ratio of the minimum height from the surface of the pressure-sensitive adhesive layer to the non-adhesive masking member is 14 to 50%.
[2] The pressure-sensitive adhesive layer contains a (meth) acrylic acid ester-based polymer (A) and a non-halogen phosphoric acid ester-based flame retardant (B), and the above (B) relative to 100 parts by mass of the (A) component The pressure-sensitive adhesive tape according to the above [1], wherein the content of the component is 1.0 to 60 parts by mass.
[3] The non-halogen phosphate ester flame retardant (B) is selected from the group consisting of hydroxyphenyl phosphate, resorcinol bisphenyl phosphate, bisphenol A bis diphenyl phosphate, and resorcinol bis di-2, 6-xylenyl phosphate The pressure-sensitive adhesive tape according to the above [2], which is one or more of the following.
[4] The pressure sensitive adhesive tape according to any one of the above [1] to [3], wherein the thickness of the pressure sensitive adhesive layer is 0.1 to 2.0 mm.
[5] The sense according to any one of the above [1] to [4], wherein the temperature at which the tensile storage modulus of the pressure-sensitive adhesive layer is 1.0 × 10 ⁴ Pa or less is 205 ° C. or less Pressure sensitive adhesive tape.
[6] The pressure-sensitive adhesive tape according to any one of the above [1] to [5], wherein the pressure-sensitive adhesive layer further contains fine particles.
[7] The pressure-sensitive adhesive tape according to any one of the above [1] to [6], wherein the pressure-sensitive adhesive layer further contains a tackifying resin.
[8] The sense according to any one of the above [1] to [7], which has the non-adhesive masking member on one surface of the pressure-sensitive adhesive layer and a substrate on the other surface. Pressure sensitive adhesive tape.
[9] The pressure sensitive adhesive tape according to the above [8], further having a removable adhesive layer on the substrate.

ADVANTAGE OF THE INVENTION According to this invention, it is used suitably, for example, when fixing the carpet of an aircraft to an aircraft housing, position adjustment of a carpet can be performed easily at the time of fixing operation, and after fixing, it expresses good adhesion to a carpet. Pressure sensitive adhesive tape can be provided.
The pressure-sensitive adhesive tape of the present invention is a double-sided adhesive tape provided with a non-adhesive masking member on one surface of the pressure-sensitive adhesive layer and satisfying the predetermined requirements, and having a removable adhesive layer on the other surface. Furthermore, in the case of carpet replacement of an aircraft, there is an effect that the adhesive residue to the aircraft housing is small and the removability is excellent.

It is a cross-sectional schematic diagram which shows one Embodiment of the pressure-sensitive adhesive tape of this invention. It is a cross-sectional schematic diagram which shows one Embodiment in the case of pressure-bonding the pressure-sensitive adhesive tape of this invention to a to-be-adhered body. It is explanatory drawing for demonstrating the non-adhesive masking member which consists of a 2-axis synthetic resin filament tape. It is explanatory drawing for demonstrating the non-adhesive masking member which consists of a synthetic resin filament tape of 3 axis | shafts.

[Pressure-sensitive adhesive tape]
The pressure-sensitive adhesive tape of the present invention (hereinafter, also simply referred to as "pressure-sensitive adhesive tape") is formed on at least one surface of an acrylic pressure-sensitive adhesive layer (hereinafter, also simply referred to as "pressure-sensitive adhesive layer"). The pressure-sensitive adhesive layer has an adhesive masking member, and the tensile storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer is 5.0 × 10 ^{4 to} 1.0 × 10 ⁷ Pa. And, the ratio of the area of the portion coated with the non-adhesive masking member on the surface of the pressure-sensitive adhesive layer is 5 to 11%, and the pressure-sensitive adhesive to the thickness of the pressure-sensitive adhesive layer The ratio of the minimum height from the surface of the agent layer to the non-adhesive masking member is 14 to 50%.
The pressure-sensitive adhesive tape of the present invention having the above-described configuration can easily adjust the position of the carpet at the time of the fixing operation, for example, when the carpet of the aircraft is used when fixing it to the aircraft housing (hereinafter It is also referred to as “position adjustment function.”) After fixing, it exhibits good adhesion to the carpet.

The structure of the pressure-sensitive adhesive tape of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing an embodiment of the pressure-sensitive adhesive tape of the present invention. The pressure-sensitive adhesive tape 10 in FIG. 1 has a non-adhesive masking member 12 on one surface 11 a of the pressure-sensitive adhesive layer 11. In FIG. 1, the non-adhesive masking member 12 is laminated so as to protrude from the pressure-sensitive adhesive layer surface 11 a, and the non-adhesive masking member 12 is a pressure-sensitive adhesive at the contact portion with the pressure-sensitive adhesive layer 11. Layer surface 11a is partially covered.

The pressure-sensitive adhesive tape 10 of the present invention can be used by bonding at least the surface of the pressure-sensitive adhesive tape 10 on the side having the non-adhesive masking member 12 to an adherend. It is good to be known.
First, the pressure-sensitive adhesive tape 10 may be temporarily adhered to an adherend. Specifically, the surface of the pressure-sensitive adhesive tape 10 having the non-adhesive masking member 12 is attached to the adherend 20, and the surface 11a of the pressure-sensitive adhesive layer 11 partially contacts the adherend 20. The pressure sensitive adhesive tape 10 may be subjected to relatively weak pressure. At this time, by having the non-adhesive masking member 12, the pressure-sensitive adhesive tape 10 can be easily peeled off even if it is once adhered to the adherend, and the position adjustment can be freely performed. For example, in the carpet fixing operation described later, temporary bonding is performed by placing the carpet on the floor.
It is preferable to perform the main bonding after the sticking position is determined. The main adhesion is to firmly adhere the pressure-sensitive adhesive tape 10 to the adherend 20 in order to adhere the pressure-sensitive adhesive tape 10 to the adherend 20 for a long period of time. Specifically, if relatively strong pressure is applied to the pressure-sensitive adhesive tape 10 by pressing or the like, and the non-adhesive masking member 12 intrudes into the pressure-sensitive adhesive layer 11 as shown in FIG. Good. Thus, the pressure-sensitive adhesive layer 11 has a large contact area with respect to the adherend 20 and adheres so as to be pressed against the adherend 20, and the pressure-sensitive adhesive tape 10 is firmly adhered to the adherend 20. It will be For example, in fixing work of the carpet to be described later, the main bonding is performed by pressing the carpet placed on the floor from above.
By the above mechanism, in the pressure-sensitive adhesive tape 10, the position adjustment up to the final determination of the sticking position of the adherend can be easily performed, and after the position adjustment is completed, pressure may be applied. Thus, the adherend can be firmly adhered.

The pressure-sensitive adhesive tape of the present invention is preferably a double-sided pressure-sensitive adhesive tape. In that case, what becomes a base-material-less double-sided adhesive tape is mentioned, for example. The substrate-less double-sided pressure-sensitive adhesive tape has no substrate for supporting the pressure-sensitive adhesive layer 11, and both surfaces 11a and 11b of the pressure-sensitive adhesive layer 11 serve as adhesive surfaces to be adhered to adherends. A configuration having the adhesive masking member 12 may be mentioned. The surface 11 b of the pressure-sensitive adhesive layer 11 may further have a non-adhesive masking member, a releasable adhesive layer (not shown), and the like.
When the pressure-sensitive adhesive tape of the present invention is a double-sided pressure-sensitive adhesive tape, as shown in FIG. 1, the non-adhesive masking member 12 is provided on one surface 11 a of the pressure-sensitive adhesive layer 11. It is more preferable that it is the structure which has the material 13, and is a structure which further has the removable adhesive layer 14 on the base material 13. For example, when the double-sided pressure-sensitive adhesive tape of the above configuration is used when fixing a carpet of an aircraft to an aircraft housing, the pressure-sensitive adhesive layer 11 side of the double-sided pressure-sensitive adhesive tape is adhered to the carpet. Bond the face to the aircraft housing. Thereby, while being able to express the position adjustment function at the time of the fixing operation of a carpet, and the adhesive force after fixation, the adhesive residue to an aircraft housing is small at the time of carpet replacement, and removability becomes favorable.
A release sheet (not shown) may be laminated on the pressure-sensitive adhesive layer side or the releasable adhesive layer side of the pressure-sensitive adhesive tape 10 for surface protection before using the adhesive tape.

In the pressure-sensitive adhesive tape of the present invention, the ratio of the area of the surface of the pressure-sensitive adhesive layer covered by the non-adhesive masking member (hereinafter also referred to as "coverage") is 5 to 11%. If the coverage is less than 5%, even if the non-adhesive masking member is laminated on the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape, the surface on the pressure-sensitive adhesive layer side of the adhesive tape is the adherend It sticks strongly, and position adjustment becomes difficult. On the other hand, when the coverage exceeds 11%, the position adjustment of the adherend is easy, but the adhesion after pressure bonding is reduced.
From the above viewpoint, the coverage of the pressure-sensitive adhesive layer surface is preferably 6 to 10%, more preferably 7 to 8%.
In addition, "the area of the part currently coat | covered by the non-adhesive masking member" means the area currently coat | covered effectively by the material which comprises a non-adhesive masking member. For example, as described later, when using a member having an opening such as a mesh or a net as the non-adhesive masking member, the opening in the area of the non-adhesive masking member laminated on the surface of the pressure-sensitive adhesive layer The area of the part is not included in "the area of the part covered by the non-adhesive masking member".

In the pressure-sensitive adhesive tape according to the present invention, the ratio of the minimum height from the surface of the pressure-sensitive adhesive layer to the non-adhesive masking member relative to the thickness of the pressure-sensitive adhesive layer (from the surface of the pressure-sensitive adhesive layer to the non-adhesive masking member Minimum thickness / pressure-sensitive adhesive layer thickness) is 14 to 50%. Even if the non-adhesive masking member is laminated on the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape, if the proportion is less than 14%, the surface on the pressure-sensitive adhesive layer side strongly adheres to the adherend, Position adjustment becomes difficult. On the other hand, when the ratio exceeds 50%, the adhesive strength after pressure bonding is reduced. The ratio is preferably 14.6% or more, and preferably 40% or less, more preferably 30% or less.
In the present specification, “the thickness of the pressure-sensitive adhesive layer” means the thickness of the portion of the pressure-sensitive adhesive layer where the non-adhesive masking member is not laminated, and is the thickness indicated by x in FIG. . The “minimum height from the pressure-sensitive adhesive layer surface to the non-adhesive masking member” means the thickness of the lowest portion of the non-adhesive masking member 12 protruding from the pressure-sensitive adhesive layer surface 11 a in FIG. means. More specifically, it will be described in the section of the non-adhesive masking member described later.
The thickness of the pressure-sensitive adhesive layer can be measured by the method described in the examples described later.

(Acrylic pressure sensitive adhesive layer)
The pressure-sensitive adhesive layer in the pressure-sensitive adhesive tape of the present invention is a pressure-sensitive adhesive layer formed from an acrylic pressure-sensitive adhesive composition, and contains at least an acrylic polymer.
The pressure-sensitive adhesive layer preferably contains at least a (meth) acrylic acid ester-based polymer (A) from the viewpoint of obtaining a good adhesive force. Furthermore, from the viewpoint of flame retardancy, the pressure-sensitive adhesive layer more preferably contains the (meth) acrylic acid ester polymer (A) and the non-halogen phosphoric acid ester flame retardant (B). The (meth) acrylic acid ester-based polymer (A) and the non-halogen phosphoric acid ester-based flame retardant (B) will be described later.

The pressure-sensitive adhesive layer has a tensile storage modulus at 23 ° C. of 5.0 × 10 ^{4 to} 1.0 × 10 ⁷ Pa. When the tensile storage modulus at 23 ° C. is out of this range, it becomes difficult to develop sufficient cohesion. The tensile storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer is preferably 1 × 10 ^{5 to} 6 × 10 ⁷ Pa, more preferably 3 × 10 ^{5 to} 5 × 10 ⁷ from the viewpoint of making the adhesiveness better. More preferably, it is 3.5 × 10 ⁵ to 8 × 10 ⁵ Pa.
The tensile storage elastic modulus of the pressure-sensitive adhesive layer can be measured under the conditions of a measurement frequency of 10 Hz and a set temperature rising rate of 10 ° C./min in a tensile mode using a dynamic viscoelasticity measuring apparatus, Can be measured by the method described in the examples.

The tensile storage modulus of the pressure-sensitive adhesive layer decreases as the temperature is raised, but when the temperature is raised, the tensile storage modulus is 1.0 × 10 ^4. It is preferable that the temperature which becomes Pa is 205 degrees C or less. When the temperature at which the tensile storage elastic modulus of the pressure-sensitive adhesive layer is 1.0 × 10 ⁴ Pa is 205 ° C. or less, the flame retardancy is improved. Although the principle is not clear, it is estimated as follows.
The pressure-sensitive adhesive layer is more fluid when heated, and partially drops when it is further heated from that state. However, when the dripping temperature becomes low, the dripping matter burns first, and the non-halogen phosphate ester flame retardant (B) is combined to burn the entire pressure-sensitive adhesive layer. It is estimated that the flame retardancy of the pressure-sensitive adhesive layer is improved. Then, the pressure-sensitive adhesive layer, a tensile storage modulus 1.0 × 10 ⁴ Pa or less is in a state of being softened or fluidized, the tensile storage elastic modulus is 1.0 × 10 ⁴ Pa or less When the temperature is low, the dropping temperature also decreases, and it is estimated that the flame retardancy of the pressure-sensitive adhesive layer is improved.
Further, the temperature at which the tensile storage modulus is 1.0 × 10 ⁴ Pa is preferably 200 ° C. or less in order to further enhance the flame retardancy. On the other hand, the lower limit value of the temperature at which the tensile storage elastic modulus is 1.0 × 10 ⁴ Pa is not particularly limited, but practically, 160 ° C. or more is preferable, 170 ° C. or more is more preferable, 180 ° C. or more Is more preferred.
The temperature at which the tensile storage elastic modulus is 1.0 × 10 ⁴ Pa is within the above range, for example, by adjusting the mass average molecular weight of the (meth) acrylate polymer (A) as described later. Is possible.

  The thickness of the pressure-sensitive adhesive layer is preferably 0.1 mm or more, more preferably 0.2 mm or more, still more preferably 0.25 mm or more, still more preferably 0.3 mm or more, preferably 2.0 mm or less. More preferably, it is 1.5 mm or less, still more preferably 1.2 mm or less, and still more preferably 1.0 mm or less. When the thickness of the pressure-sensitive adhesive layer is 0.1 mm or more, sufficient adhesive force can be secured, and when the thickness is 2.0 mm or less, the position adjusting function of the pressure-sensitive adhesive layer is good, and the following on the adherend surface Sex is also good.

<(Meth) Acrylate Polymer (A)>
The pressure-sensitive adhesive layer preferably contains at least a (meth) acrylic acid ester-based polymer (A) from the viewpoint of obtaining a good adhesive force.
The (meth) acrylic acid ester-based polymer (A) can be obtained, for example, by polymerizing an acrylic pressure-sensitive adhesive composition containing the following polymerizable monomer (a), and the weight of the following polymerizable monomer (a) It is union.

[Polymerizable monomer (a)]
As a polymerizable monomer (a), a (meth) acrylic-acid alkylester type monomer can be mentioned, for example. In the present specification, “(meth) acrylic acid alkyl ester” means “acrylic acid alkyl ester or methacrylic acid alkyl ester”. Other similar terms are similar.
[(Meth) acrylic acid alkyl ester type monomer]
The (meth) acrylic acid alkyl ester-based monomer in the present invention is an ester of (meth) acrylic acid and an aliphatic alcohol, and the carbon number of the alkyl group of the aliphatic alcohol is preferably 2 to 14, more preferably Is preferably an alkyl ester derived from an aliphatic alcohol of 4 to 10. The glass transition temperature (Tg) of a pressure-sensitive adhesive layer does not become high too much that carbon number of an alkyl group is in the said range, and adhesive force becomes favorable. In addition, the tensile storage elastic modulus at 23 ° C. and the temperature at which the tensile storage elastic modulus becomes 1.0 × 10 ⁴ Pa can be easily adjusted within the above ranges.

Specific (meth) acrylic acid alkyl ester type monomers include, for example, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate , T-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, nonyl Examples include (meth) acrylate, decyl (meth) acrylate, undecyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, and tetradecyl (meth) acrylate.
Among these, hexyl (meth) acrylate, heptyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and n-octyl (meth) acrylate are preferable, and 2-ethylhexyl (meth) acrylate is more preferable.
The (meth) acrylic acid alkyl ester monomers may be used alone or in combination of two or more.

The content of the (meth) acrylic acid alkyl ester type monomer in the polymerizable monomer (a) is preferably 80% by mass or more, more preferably 85% by mass or more, still more preferably 88% by mass or more, and preferably Is 99% by mass or less, more preferably 97% by mass or less, and still more preferably 95% by mass or less. By setting the content in the above range, the tensile storage elastic modulus at 23 ° C. and the temperature at which the tensile storage elastic modulus becomes 1.0 × 10 ⁴ Pa can be easily adjusted in the above range. It is also possible to improve the adhesion of the pressure-sensitive adhesive layer.

[Polar group-containing monomer]
In the present invention, the pressure-sensitive adhesive layer has a Tg, a tensile storage modulus at 23 ° C., and a temperature and the like at which the tensile storage modulus is 1.0 × 10 ⁴ Pa, and the like. From the viewpoint of improving the cohesion, a polar group-containing monomer may be used as the polymerizable monomer (a). The polar group-containing monomer is preferably used in combination with the (meth) acrylic acid alkyl ester-based monomer described above.
Examples of polar group-containing monomers include (meth) acrylic acid and carboxylic acids containing a vinyl group such as itaconic acid;
2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, caprolactone modified (meth) acrylate, polyoxyethylene (meth) acrylate, and polyoxypropylene (meth) acrylate Vinyl monomers having a hydroxyl group such as
(Meth) acrylonitrile, N-vinylpyrrolidone, N-vinylcaprolactam, N-vinyl lauryl lactam, (meth) acryloyl morpholine, (meth) acrylamide, dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, N-butoxy Mention may be made of nitrogen-containing vinyl monomers such as methyl (meth) acrylamide and dimethylaminomethyl (meth) acrylate.
Among these, (meth) acrylic acid and carboxylic acids containing a vinyl group such as itaconic acid are preferable, (meth) acrylic acid is more preferable, and acrylic acid is more preferable.
These polar group-containing monomers may be used alone or in combination of two or more.

When the polymerizable monomer (a) contains a polar group-containing monomer, the content thereof in the polymerizable monomer (a) is preferably 1% by mass or more, more preferably 2% by mass or more, still more preferably 3% by mass The content is more preferably 4% by mass or more, and preferably 15% by mass or less, more preferably 12% by mass or less, and still more preferably 10% by mass or less. By adjusting the content of the polar group-containing monomer within the above range, the temperature at which the tensile storage elastic modulus and the tensile storage elastic modulus at 23 ° C. become 1.0 × 10 ⁴ Pa can be easily made within the above range. In addition, the adhesion of the pressure-sensitive adhesive layer can be easily improved.

[Other monomer]
From the viewpoint of adjusting the viscosity of the acrylic pressure-sensitive adhesive composition, as the polymerizable monomer (a), other monomers than the (meth) acrylic acid alkyl ester-based monomer and the polar group-containing monomer may be used.
Examples of other monomers include styrene-based monomers such as styrene, α-methylstyrene, o-methylstyrene, and p-methylstyrene.

  When the polymerizable monomer (a) contains another monomer, the content is preferably 0.5% by mass or more, more preferably 1% by mass or more, from the viewpoint of adjusting the viscosity of the acrylic pressure-sensitive adhesive composition And preferably 10% by mass or less, more preferably 5% by mass or less, still more preferably 3% by mass or less, still more preferably 2% by mass or less.

[Mass average molecular weight]
The (meth) acrylic ester polymer (A) preferably has a mass average molecular weight of 500,000 to 1,500,000. By setting the mass average molecular weight of the (meth) acrylate polymer (A) within such a range, the tensile storage elastic modulus at 23 ° C. and the tensile storage elastic modulus become 1.0 × 10 ⁴ Pa. It becomes easy to adjust the temperature within the above range.
From the above viewpoint, the mass average molecular weight of the (meth) acrylate polymer (A) is more preferably 600,000 or more, still more preferably 700,000 or more, still more preferably 800,000 or more, more preferably 1.4 million Hereinafter, more preferably, it is 1.3 million or less, more preferably, 1.1 million or less, and most preferably 1 million or less.
In the present specification, the mass average molecular weight of the (meth) acrylate polymer (A) is a value measured by gel permeation chromatography (GPC) and converted using a standard polystyrene calibration curve. . Moreover, when it is bridge | crosslinked by the crosslinking agent mentioned later with the mass mean molecular weight of a (meth) acrylic acid ester type polymer (A), the (meth) acrylic acid ester type polymer (A) which is not bridge | crosslinked The weight-average molecular weight of the compound of the formula (I) may be measured, for example, according to the examples described later.
More specifically, a polymer obtained by polymerizing only the polymerizable monomer (a) under the same conditions (the same kind and amount of the photopolymerization initiator and the same curing conditions) as in forming the pressure-sensitive adhesive layer It means the measured mass average molecular weight. Therefore, even when the acrylic pressure-sensitive adhesive composition contains a crosslinking agent, the mass average molecular weight is measured for one obtained by polymerizing the polymerizable monomer (a) without containing the crosslinking agent.

[Crosslinking agent]
The (meth) acrylic acid ester-based polymer (A) is contained in the pressure-sensitive adhesive layer from the viewpoint of improving the cohesion of the pressure-sensitive adhesive layer and from the viewpoint of preparing the gel fraction of the pressure-sensitive adhesive layer. It is preferable to be crosslinked by a crosslinking agent.
As a crosslinking agent, what has 2 or more of vinyl groups is mentioned, Preferably the polyfunctional (meth) acrylate which has 2 or more of (meth) acryloyl groups is mentioned. Such a crosslinking agent is incorporated into the main chain of the (meth) acrylate polymer (A) and crosslinks the main chains to form a network.
Specific examples of the crosslinker include hexanediol di (meth) acrylate, polyethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, ethoxylated bisphenol A di (meth) acrylate and tris (2-hydroxyethyl) isocyanate. Nurate triacrylate, ethoxylated trimethylolpropane triacrylate, proxyed trimethylolpropane triacrylate, proxyed glyceryl triacrylate, neopentyl glycol adipate diacrylate, polyurethane acrylate, epoxy acrylate, polyester acrylate, and liquid hydrogenation 1,2- Polybutadiene diacrylate etc. are mentioned.
Among these, a crosslinking agent having a molecular weight of 400 or more is preferable, and specifically, polyurethane acrylate, polyester acrylate, liquid hydrogenated 1,2-polybutadiene diacrylate and the like are preferable, and liquid hydrogenated 1,2-polybutadiene diacrylate is preferable. Is more preferred.

  When the (meth) acrylate polymer (A) is crosslinked by a crosslinking agent, the amount of the crosslinking agent relative to 100 parts by mass of the polymerizable monomer (a) is preferably 0.1 parts by mass or more, more preferably It is 0.5 parts by mass or more, more preferably 1 part by mass or more, and preferably 5 parts by mass or less, more preferably 2 parts by mass or less. By adjusting the amount of the crosslinking agent within these ranges, it is possible to improve the adhesion of the pressure-sensitive adhesive and to obtain a pressure-sensitive adhesive having an appropriate gel fraction.

[Method for producing (meth) acrylic acid ester based polymer (A)]
Although there is no restriction | limiting in particular in the manufacturing method of a (meth) acrylic-ester type polymer (A), For example, the acrylic adhesive composition containing a polymerizable monomer (a) and a photoinitiator and a crosslinking agent as needed Can be produced by irradiating light for polymerization.
<Photoinitiator>
Examples of the photopolymerization initiator that can be used in the present invention include ketones such as 4- (2-hydroxyethoxy) phenyl (2-hydroxy-2-propyl) ketone [trade name: Darocure 2959, manufactured by Merck Co., Ltd.]; α-hydroxy-α, α-dimethyl-acetophenone (trade name: Darocure 1173, manufactured by Merck), methoxyacetophene, 2,2-dimethoxy-2-phenylacetophene (trade name: Irgacure 651, manufactured by BASF Corp.), and Acetophenones such as 2-hydroxy-2-cyclohexylacetophenone (trade name: Irgacure 184, manufactured by BASF); ketals such as benzyl dimethyl ketal; and others such as halogenated ketones, acyl phosphinoxides, and acyl phosphonates .

  The amount of the photopolymerization initiator relative to 100 parts by mass of the polymerizable monomer (a) is preferably 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, from the viewpoint of reducing the amount of residual monomers described later. The amount is preferably 0.2 parts by mass or more, particularly preferably 0.4 parts by mass or more, and from the viewpoint of preventing a large amount of photopolymerization initiator from remaining in the pressure-sensitive adhesive layer, preferably 5 parts by mass or less More preferably, it is 3 parts by mass or less, more preferably 2 parts by mass or less.

<Non-halogen phosphate ester flame retardant (B)>
The pressure-sensitive adhesive layer preferably further contains a non-halogen phosphoric acid ester flame retardant (B) for the purpose of improving the flame retardancy.
As non-halogen phosphate ester flame retardants, for example, trimethyl phosphate, triethyl phosphate, tripropyl phosphate, tributyl phosphate, tripentyl phosphate, trihexyl phosphate, tricyclohexyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl Phosphate, dimethylethyl phosphate, methyl dibutyl phosphate, ethyl dipropyl phosphate, hydroxyphenyl diphenyl phosphate, resorcinol bis diphenyl phosphate, bisphenol A bis diphenyl phosphate, resorcinol bis di-2, 6-xylenyl phosphate and various substituents The substituted compound etc. are mentioned.
Among these, one or more selected from hydroxyphenyl diphenyl phosphate, resorcinol bis diphenyl phosphate, bisphenol A bis diphenyl phosphate, and resorcinol bis di-2, 6-xylenyl phosphate are preferable, and resorcinol bis diphenyl phosphate, bisphenol A bis One or more selected from diphenyl phosphate is more preferable.

The content of the non-halogen phosphoric acid ester flame retardant (B) in the pressure-sensitive adhesive layer is preferably 1.0 to 60 parts by mass with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A) is there. If the content is 1.0 parts by mass or more, sufficient flame retardancy can be imparted to the pressure-sensitive adhesive layer, and if it is 60 parts by mass or less, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive layer is inhibited from lowering it can.
The content is preferably 1.5 parts by mass or more, more preferably 2.0 parts by mass or more, and still more preferably 2.5 parts by mass or more from the viewpoint of imparting sufficient flame retardancy to the pressure-sensitive adhesive layer. It is. Further, from the viewpoint of suppressing the decrease in the adhesive strength of the pressure-sensitive adhesive layer, it is preferably 55.0 parts by mass or less, more preferably 50.0 parts by mass or less, still more preferably 45.0 parts by mass or less More preferably, it is 40.0 parts by mass or less.
In addition, since the above-mentioned polymerizable monomer (a) has good reactivity, in the present invention, “100 parts by mass of (meth) acrylic acid ester polymer (A)” and “polymerizable monomer (a)” "100 parts by mass" can be regarded as the same amount. Therefore, “the amount of the non-halogen phosphoric acid ester flame retardant (B) relative to 100 parts by mass of the (meth) acrylic acid ester polymer (A)” produces the (meth) acrylic acid ester polymer (A) It can calculate based on the preparation amount of the polymerizable monomer (a) in the case.

<Other ingredients>
The pressure-sensitive adhesive layer in the present invention and the acrylic pressure-sensitive adhesive composition for forming the same may contain, for example, the following components.
[Particles]
The pressure-sensitive adhesive layer preferably further contains fine particles from the viewpoint of improving adhesion and cohesion.
The volume median particle diameter (D50) of the fine particles is preferably 5 μm or more, more preferably 10 μm or more, still more preferably 15 μm or more, still more preferably 20 μm or more, from the viewpoint of improving the adhesion of the pressure-sensitive adhesive layer. Still more preferably, it is 25 μm or more. Further, from the viewpoint of improving the cohesion of the pressure-sensitive adhesive layer, it is preferably 150 μm or less, more preferably 130 μm or less, still more preferably 120 μm or less, still more preferably 110 μm or less, still more preferably 100 μm or less.
In the present specification, “volume-median particle size (D50)” means a particle size at which the cumulative volume frequency calculated by volume fraction is 50% as calculated from the smaller particle size.

  As the fine particles, inorganic hollow particles such as glass balloon, shirasu balloon and fly ash balloon, organic hollow particles composed of polymethyl methacrylate, acrylonitrile-vinylidene chloride copolymer, polystyrene, phenol resin, etc., glass beads, silica Examples thereof include beads and inorganic fine particles such as synthetic mica, and organic fine particles such as ethyl polyacrylate, polyurethane, polyethylene, and polypropylene.

  When the pressure-sensitive adhesive layer contains fine particles, relative to 100 parts by mass of the (meth) acrylate polymer (A) (that is, 100 parts by mass of the polymerizable monomer (a) in the acrylic adhesive composition) The content of the fine particles is preferably 0.1 parts by mass or more, more preferably 0.3 parts by mass or more, from the viewpoint of improving the adhesion of the pressure-sensitive adhesive layer. In addition, from the viewpoint of suppressing the decrease in the cohesive force of the pressure-sensitive adhesive layer, the content is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, and still more preferably 1 part by mass or less.

[Tackifying resin]
The pressure-sensitive adhesive layer may further contain a tackifying resin from the viewpoint of improving the adhesive strength.
As the tackifying resin, tackifying resins with low polymerization inhibition such as hydrogenated terpene resin, hydrogenated rosin, disproportionated rosin resin, petroleum resin, and hydrogenated petroleum resin are preferable. Among these, hydrogenated petroleum resins are preferable because the tackifying resin has a large number of double bonds, which inhibits the polymerization reaction.
The softening point of the tackifying resin is preferably 120 ° C. or more, more preferably 125 ° C. or more, from the viewpoint of improving the cohesion of the pressure-sensitive adhesive layer.

  When the pressure-sensitive adhesive layer contains a tackifying resin, 100 parts by mass of (meth) acrylate polymer (A) (that is, 100 parts by mass of polymerizable monomer (a) in the acrylic adhesive composition) The content of the tackifying resin with respect to is preferably 3 parts by mass or more, more preferably 5 parts by mass or more, still more preferably 7 parts by mass or more, and still more preferably 9 parts by mass or more. The content is preferably 40 parts by mass or less, more preferably 35 parts by mass or less, still more preferably 30 parts by mass or less, and still more preferably 25 parts by mass or less. While the adhesive force of a pressure-sensitive adhesive layer improves that the quantity of tackifying resin is in the said range, a softness is also improved.

  The pressure-sensitive adhesive layer in the present invention and the acrylic pressure-sensitive adhesive composition for forming the same contain, in addition to the above-mentioned other components, as additives, for example, plasticizers, softeners, pigments, dyes, etc. May be contained.

<Method of forming pressure-sensitive adhesive layer>
The method of forming the pressure-sensitive adhesive layer is not particularly limited, but the polymerizable monomer (a), the non-halogen phosphate ester flame retardant (B), and, if necessary, the photopolymerization initiator, the crosslinking agent, and the tackifying resin It is preferable to form a pressure sensitive adhesive layer, manufacturing a (meth) acrylic-ester type polymer (A) by light-irradiating to the acrylic adhesive composition containing etc ..
Specifically, first, one or more polymerizable monomers (a), non-halogen phosphoric acid ester flame retardant (B), and a photopolymerization initiator, a crosslinking agent, a tackifying resin, etc. Into an acrylic pressure-sensitive adhesive composition.
Next, in order to remove dissolved oxygen in the acrylic pressure-sensitive adhesive composition, generally, an inert gas such as nitrogen gas is supplied to purge oxygen. The pressure-sensitive adhesive layer can be formed by applying the pressure-sensitive adhesive composition to a release sheet such as release paper or a base material described later, and then irradiating with light to polymerize.
It is preferable that the process from the application or impregnation of the pressure-sensitive adhesive composition to the step of irradiating light be performed in an inert gas atmosphere or in a state where oxygen is blocked by a film or the like.

Examples of lamps that can be used for irradiating the acrylic pressure-sensitive adhesive composition with light include low-pressure mercury lamps, medium-pressure mercury lamps, high-pressure mercury lamps, ultra-high pressure mercury lamps, chemical lamps, black light lamps, microwave excitation mercury lamps, A metal halide lamp etc. are mentioned. Among these, chemical lamps are preferred. Although the light irradiation intensity at the time of irradiating light with respect to an acrylic adhesive composition changes with photoinitiators, about 0.1-100 mW / cm < ² > is preferable.

(Non-adhesive masking member)
The material constituting the non-adhesive masking member 12 is not particularly limited as long as it is non-adhesive, and is, for example, a synthetic fiber composed of a natural fiber such as cotton, an olefin resin, polyethylene, polypropylene, polyester, polyethylene terephthalate, etc. A synthetic resin such as the same olefin resin, or any material such as metal can be used. Non-adhesive masking member 12 made of such material, woven from cotton yarn or synthetic resin fiber, mesh or net made of polyethylene, polypropylene or polyethylene terephthalate etc., non-woven fabric composed of polyester fiber, metal such as brass or stainless steel A porous structure such as a metal mesh can be formed.
When a mesh made of various materials is used as the non-adhesive masking member, the mesh of the mesh is coarse from the viewpoint of sufficiently projecting the pressure-sensitive adhesive layer to the surface of the adherend at the time of pressure bonding. Is preferred.

  As shown in FIG. 1, in the pressure-sensitive adhesive tape 10, the non-adhesive masking member 12 protrudes from the pressure-sensitive adhesive layer surface 11a. Further, as long as the non-adhesive masking member 12 partially covers the surface 11a so as to satisfy the coverage and the minimum height, the adhesive force of the pressure-sensitive adhesive layer 11 can be suppressed, and an appropriate shape can be taken. . For example, the shape of the non-adhesive masking member 12 may be a lattice shape, or may be a shape of a net or porous sheet in which circular or other openings are formed in a dispersed manner.

For example, as shown in FIG. 3, the non-adhesive masking member 12 may be, for example, synthetic resin filament tapes 12a and 12b extending in two directions. In this case, the plurality of filament tapes 12a extending in the first direction (vertical direction in FIG. 3) and the plurality of filament tapes 12b extending in the second direction (horizontal direction in FIG. 3) substantially perpendicular to the first direction are rectangular. The openings 21 are defined, and the filament tapes 12a and 12b form a net 22 which is a porous structure in which a plurality of openings 21 are formed in a distributed manner. P ₁ is the location of the filament tape 12b is only one, the lowest height from the pressure-sensitive adhesive layer 11 of the filament tape. That is, in this embodiment, the minimum height is the length from the pressure-sensitive adhesive layer surface 11a to the upper end of the filament tape 12b. P ₂ is the location where the filament tape 12a is overlapped on the filament tape 12b, the highest height from the pressure-sensitive adhesive layer surface 11a of the filament tape. That is, in this embodiment, the maximum height is the length from the pressure-sensitive adhesive layer surface 11a to the upper end of the filament tape 12a.

Alternatively, for example, as shown in FIG. 4, the non-adhesive masking member 12 may be filament tapes 12a, 12c, 12d made of synthetic resin extending in three directions. In this case, the plurality of filament tapes 12a extending in the first direction (vertical direction in FIG. 4), the plurality of filament tapes 12c obliquely extending at an angle α to the tape 12a, and the tape 12c relative to the tape 12a Consider a plurality of filament tapes 12 d obliquely extending at an angle β (in this embodiment α = β) on the opposite side to the longitudinal axis of 12 a. These define the rectangular opening 23a between the filament tape 12c and the filament tape 12d, and the triangular opening 23b between the filament tape 12a, the filament tape 12c and the filament tape 12d. The filament tapes 12a, 12c and 12d constitute a net 24 which is a porous structure in which a plurality of openings 23a and 23b are formed in a dispersed manner. The angle of α and β may be more than 0 ° and less than 90 °, usually 10 to 80 °, and more preferably 30 to 60 °.
P ₃ is the location of the filament tape 12d is only one, the lowest height from the pressure-sensitive adhesive layer surface 11a of the filament tape. P ₄ is a portion where the filament tape 12c is overlapped on the filament tape 12d, P ₅ is a further portion of the filament tape 12a is overlapped on the filament tape 12c, pressure-sensitive adhesive layer surface of the filament tape It is the highest from 11a. Similar to the embodiment of FIG. 3, the height of the filament is the length measured from the pressure-sensitive adhesive layer surface 11a to the upper end of the filament tape.

  The shape of the opening formed by the non-adhesive masking member 12, that is, the portion of the pressure-sensitive adhesive layer surface 11a exposed to the adherend is not limited to a square or a polygon, and may be any other shape such as a circle. You can also.

  The non-adhesive masking member 12 is required to protrude from the pressure-sensitive adhesive layer surface 11a at the time of position adjustment of the adherend, but at the time of pressure bonding, it is flush with the pressure-sensitive adhesive layer surface 11a. Sink and no longer perform the position adjustment function.

Non-adhesive masking member 12 of the minimum height of non-adhesive masking member 12 from pressure sensitive adhesive layer surface 11a in the adhesive tape of the present invention, that is, the part where the height of non-adhesive masking member 12 is the lowest The height from the pressure-sensitive adhesive layer surface 11a under the surface to the upper end (P _{3 in} FIG. 4) of the non-adhesive masking member 12 is not particularly limited, but is preferably 300 μm or less, more preferably 30 to 300 micrometers, More preferably, it is 100-300 micrometers, More preferably, it is 250-300 micrometers. The adhesion | attachment of the to-be-adhered body surface to the pressure sensitive adhesive layer surface 11a becomes it easy that this minimum height is 300 micrometers or less.

(Base material)
The pressure-sensitive adhesive tape of the present invention may have a non-adhesive masking member on one surface of the pressure-sensitive adhesive layer and a substrate on the other surface.
The base material is not particularly limited, but, for example, a resin film such as polyethylene terephthalate, a resin cloth using polyethylene terephthalate or the like, a foam having an open cell structure, a resin material such as polyvinyl alcohol, polyvinyl acetal, or urethane is used. A moisture-permeable film, an impregnated paper, a coated paper, a high quality paper, a kraft paper, a Japanese paper, a synthetic paper, a laminate product of these, etc. may be mentioned. Among them, polyethylene terephthalate film (PET film) and polyethylene terephthalate cloth (PET cloth) are preferable from the viewpoint of making it difficult for the substrate to be broken at the time of rework.

Examples of the moisture-permeable film include KTF (manufactured by Mitsubishi Resins Co., Ltd.), Espoir (manufactured by Mitsui Chemicals, Inc.), Poram (manufactured by Tokuyama), Tapiren MPF (manufactured by Daika Kogyo Co., Ltd.), Celpore Commercial products such as Sekisui Film Co., Ltd., microporous film (3M Japan Co., Ltd.), PORO (Futamura Chemical Co., Ltd.), Hipore (Asahi Kasei E-Materials Co., Ltd.), etc. are available. . In addition, those mechanically treated with craze are commercially available as, for example, Monotran (manufactured by Nack Co., Ltd.).
Further, the base material may be a release sheet in which one surface of each of the above materials is subjected to release treatment, in which case it is preferable to provide a pressure-sensitive adhesive layer on the release treatment surface.

A release layer, an antistatic layer or the like may be provided on the surface of the base opposite to the surface on which the pressure-sensitive adhesive layer is provided. Moreover, in order to improve the adhesiveness of a base material and a pressure sensitive adhesive layer, you may surface-treat a corona treatment etc. with respect to a base material as needed.
The thickness of the substrate is preferably 20 μm or more, and more preferably 30 to 100 μm. By setting the thickness of the substrate to 20 μm or more, it becomes difficult to cause breakage or the like at the time of rework.

(Removable adhesive layer)
The pressure-sensitive adhesive tape of the present invention is preferably a double-sided pressure-sensitive adhesive tape, and as shown in FIG. 1, the pressure-sensitive adhesive layer 11 has a non-adhesive masking member 12 on one surface and a base 13 on the other surface. It is more preferable to have a configuration in which the removable adhesive layer 14 is further provided on the substrate 13. For example, when using the double-sided pressure-sensitive adhesive tape of the above configuration when fixing a carpet of an aircraft to an aircraft housing, the surface on the pressure-sensitive adhesive layer 11 side of the double-sided pressure-sensitive adhesive tape shown in FIG. Bond the surface on the 14 side to the aircraft housing. Thereby, while being able to express the position adjustment function at the time of the fixing operation of a carpet, and the adhesive force after fixation, the adhesive residue to an aircraft housing is small at the time of carpet replacement, and removability becomes favorable.

In the double-sided pressure-sensitive adhesive tape, the adhesion of the surface on the side of the removable pressure-sensitive adhesive layer 14 is preferably lower than the adhesion of the surface on the side of the pressure-sensitive adhesive layer 11. Specifically, when the adhesive strength of the surface on the side of the removable adhesive layer 14 is F1 and the adhesive strength of the surface on the pressure-sensitive adhesive layer 11 side is F2, F2 / F1 is preferably 1.2 or more, and more Preferably it is 1.5 or more, More preferably, it is 1.8 or more. The upper limit of F2 / F1 is usually 50 or less, preferably 20 or less. In addition, "the adhesive force of the surface at the side of a pressure sensitive adhesive layer" means the adhesive force measured in the state by which the non-adhesive masking member was laminated | stacked on the pressure sensitive adhesive layer surface.
The type of the pressure-sensitive adhesive constituting the removable pressure-sensitive adhesive layer is not particularly limited. For example, a polyurethane-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive can be used. From the viewpoint of achieving both the adhesive strength and the removability, it is desirable to use an acrylic pressure-sensitive adhesive.
The thickness of the releasable adhesive layer is preferably 5 to 200 μm, more preferably 10 to 100 μm, from the viewpoint of achieving both the adhesive strength to the adherend such as an aircraft housing and the like and removability.

<Production method of pressure sensitive adhesive tape>
The method for producing the pressure-sensitive adhesive tape of the present invention is not particularly limited. The double-sided pressure-sensitive adhesive tape of the configuration shown in FIG. 1 can be produced, for example, by the following method.
First, the acrylic pressure-sensitive adhesive composition is applied onto the substrate 13, and then light is irradiated and polymerized under the above-mentioned conditions to form the pressure-sensitive adhesive layer 11 on the substrate 13. Next, the non-adhesive masking member 12 is laminated on the surface 11 a of the pressure-sensitive adhesive layer so that the coverage is in a predetermined range. On the other hand, it is possible to obtain a double-sided pressure-sensitive adhesive tape by laminating the removable pressure-sensitive adhesive layer 14 on the surface of the substrate 13 on which the pressure-sensitive adhesive layer 11 is not formed. In order to protect the pressure-sensitive adhesive layer 11 and the removable pressure-sensitive adhesive layer 14, a release sheet may be further laminated on the upper surface thereof.
Alternatively, the pressure-sensitive adhesive layer 11 may be formed on the release treatment surface of the release sheet subjected to release treatment, and the non-adhesive masking member 12 may be laminated thereon. Then, the release sheet may be released from the pressure-sensitive adhesive layer 11, and the substrate 13 and the removable adhesive layer 14 may be sequentially laminated on the release surface to produce a double-sided adhesive tape.

<Use>
The pressure-sensitive adhesive tape of the present invention can be used for various adherends. In particular, the adhesive tape of the present invention is suitably used when fixing the carpet of an aircraft to an aircraft housing, and the positioning of the carpet can be easily performed during the fixing operation, and after fixing, good adhesion to the carpet can be obtained. It is expressed. The pressure-sensitive adhesive tape of the present invention is a double-sided pressure-sensitive adhesive tape provided with a non-adhesive masking member on one surface of the pressure-sensitive adhesive layer and having a releasable adhesive layer on the other surface. In addition, it is preferable in that the adhesive residue to the aircraft casing is small at the time of carpet replacement of the aircraft, and the removability is excellent. In addition, the pressure-sensitive adhesive tape of the present invention is also suitable for use in fixing an interior material to a housing such as a car or a railway vehicle.

As said carpet, the well-known common carpet used in aircraft inside is mentioned, For example, the carpet using nylon fiber and olefin fiber is mentioned.
Examples of the material of the aircraft housing include metal alloys such as aluminum alloys and titanium alloys; composite materials of reinforcing fibers such as glass fibers and carbon fibers and matrix resins such as epoxy resins and phenol resins. More preferably, the adhesive tape of the present invention is used to secure the carpet to the floor of an aircraft.

  The present invention will be described in more detail by way of examples, but the present invention is not limited by these examples.

<Evaluation>
[Mass average molecular weight]
The mass average molecular weight of the (meth) acrylate polymer (A) was measured by gel permeation chromatography (GPC) and calculated using a standard polystyrene calibration curve.
In addition, the mass mean molecular weight is obtained by curing only the polymerizable monomer (a) under the same conditions (the same kind and amount of the photopolymerization initiator and the same curing conditions) as the respective examples and comparative examples. It is a mass mean molecular weight measured to acid ester system polymer (A).
[Tensile storage modulus]
The tensile storage elastic modulus of the pressure-sensitive adhesive layer at 23 ° C. was measured under the following measurement conditions using a dynamic viscoelasticity measurement apparatus “DVA-200 / L2” manufactured by IT Measurement & Control Corporation. The temperature tensile storage modulus is 1.0 × 10 ⁴ Pa is gradually allowed to warm to a temperature below the set heating rate, the temperature at which the tensile storage modulus is 1.0 × 10 ⁴ Pa It was measured.
(Measurement condition)
Line length: 3 cm
Sample width: 0.6 cm
Sample thickness: 0.2 cm
Deformation mode: tensile static / dynamic stress ratio: 1.5
Setting strain: 0.10%
Setting temperature rising rate: 10 ° C / min
Measurement frequency: 10 Hz

[Thickness of pressure sensitive adhesive layer]
The thickness of the pressure-sensitive adhesive layer was measured by a dial gauge (manufactured by Mitutoyo Co., Ltd.).

[Percentage of Area Covered by Non-adhesive Masking Member (Coverage Ratio)]
In the present example, the value of 100− (the opening ratio (%) of the non-adhesive masking member) was taken as the coverage.

[Position adjustment function]
The warp of the pressure-sensitive adhesive tape obtained in each example was taken in the longitudinal direction, and cut into 25 mm wide × 300 mm long.
A nylon fiber fabric (300 mm × 300 mm) was prepared as the adherend A of the pressure-sensitive adhesive layer side of the pressure-sensitive adhesive tape on which the non-adhesive masking member was laminated. In addition, SUS No. 304 (400 mm × 400 mm) was prepared as the adherend B on the side of the pressure-sensitive adhesive tape on the side on which the non-adhesive masking member was not laminated.
As an evaluation method of the position adjustment function,
[1] Draw a 300 mm x 300 mm square draft on the adherend B placed on a horizontal surface, arrange five pressure sensitive adhesive tapes cut to a width of 25 mm within the same 300 mm x 300 mm, and arrange them at equal intervals. The surface of the adhesive tape on which the non-adhesive masking member was not laminated was attached to the adherend B.
[2] The release sheet of the pressure-sensitive adhesive tape laminated in the above [1] is peeled off to expose the pressure-sensitive adhesive layer surface on which the non-adhesive masking member is laminated.
[3] The adherend A was gently placed on the surface of the pressure-sensitive adhesive layer exposed in [2].
[4] As discrimination of evaluation, if the diagonal of the adherend A of [3] is held with both hands and can be easily peeled off when pulled up vertically, A, there is sticking to the adherend, It was B if it could be peeled off by applying a force, and C if the sticking could not be peeled off strongly.

〔Adhesive force〕
The adherend A was pressure-bonded to the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive tape obtained in each example on which the non-adhesive masking member was laminated, and the main adhesion was performed, and the adhesive state was confirmed. The adhesion was evaluated according to the following criteria.
A: It adhered very firmly and had high adhesive strength.
B: It adhered firmly and had sufficient adhesive force.
C: Adhesion was insufficient.

〔Flame retardance〕
In the pressure-sensitive adhesive tapes of the respective examples, the laminate before laminating the non-adhesive masking member was cut into 5 cm × 10 cm, and the release sheet was peeled off to obtain a test piece. Attach this test piece to a metal frame and hang it in an 18 liter can, flame the power torch 8 cm indirectly to the lower end of the test piece for 12 seconds, and the one to self extinguish, do not self extinguish with the 8 cm power torch. Ignition lighter A thing which self-extinguishes when it contacts a flame of 4 cm for 12 seconds was set to B. Moreover, let C be one which does not self-extinguish on any condition. In addition, self-extinguishing means extinguishing before burning to the end of the sample.

Example 1
The pressure-sensitive double-sided pressure-sensitive adhesive tape of the configuration shown in FIG. 1 was manufactured by the following procedure.
According to the composition described in Table 1, an acrylic pressure-sensitive adhesive composition was prepared by mixing a polymerizable monomer, a non-halogen phosphoric acid ester flame retardant, a crosslinking agent, fine particles and a photopolymerization initiator. The acrylic pressure-sensitive adhesive composition was purged with nitrogen to remove dissolved oxygen.
A spacer is placed on the release-treated surface of a release-treated 50 μm PET film, the pressure-sensitive adhesive composition is applied on the PET film, the PET film is bent, and the release-treated surface is the pressure-sensitive adhesive composition. It covered so that it might touch.
In this state, the lamp intensity of the chemical lamp was adjusted so that the ultraviolet irradiation intensity of the PET film on the coated side was 5 mW / cm ^2, and ultraviolet light was irradiated for 10 minutes to obtain a pressure-sensitive adhesive layer. The thickness of the pressure-sensitive adhesive layer was 1 mm.
On the pressure-sensitive adhesive layer, as a non-adhesive masking member, a polyethylene net (monofilament (MF) diameter 280 μm, warp pitch 15 mm, diagonal thread pitch 25 mm, aperture ratio 92.5) having the three-axis crossing shape of FIG. %) Were stacked. Furthermore, the release sheet for surface protection of a pressure sensitive adhesive layer was laminated | stacked on this, and the pressure sensitive double-sided adhesive tape was obtained.

Examples 2 to 6 and Comparative Examples 1 to 4
A pressure-sensitive double-sided pressure-sensitive adhesive tape was prepared in the same manner as in Example 1, except that the pressure-sensitive adhesive layer was changed to the thickness shown in Table 1 and the non-adhesive masking member described in Table 1 was used. It produced and performed various evaluations.

The materials used in each example are as follows.
<Acrylic pressure-sensitive adhesive composition>
Polymerizable monomer (a1): 2-ethylhexyl acrylate, manufactured by Mitsui Chemicals, Inc. Polymerizable monomer (a2): acrylic acid, manufactured by Mitsui Chemicals, Inc. Flame retardant (B): bisphenol A bisdiphenyl phosphate, Daihachi Chemical Industry Co., Ltd. Co., Ltd. "CR-741"
Crosslinking agent: liquid hydrogenated 1,2-polybutadiene diacrylate, "TEAI-1000" manufactured by Nippon Soda Co., Ltd.
Fine particles: Glass balloon (D50: 55 μm), “Glass Bubbles K-25” manufactured by 3M Japan Co., Ltd.
Photopolymerization initiator: 2,2-dimethoxy-2-phenylacetophenone, "IRGACURE 651," manufactured by BASF Japan Ltd.

<Non-adhesive masking member>
M1: Polyethylene net having a three-axis crossing shape shown in FIG. 4 (monofilament (MF) diameter 280 μm, warp pitch 15 mm, diagonal thread pitch 25 mm, aperture ratio 92.5%)
M2: Polyethylene net (monofilament diameter 280 μm, warp pitch 20 mm, diagonal thread pitch 25 mm, aperture ratio 95%)
M3: Polyethylene net (monofilament diameter 280 μm, warp pitch 10 mm, diagonal thread pitch 25 mm, aperture ratio 90%)
M4: Polyethylene net (monofilament diameter 330 μm, warp pitch 10 mm, diagonal thread pitch 25 mm, aperture ratio 90%)
M5: Polyethylene net (warp: flat yarn thickness 44 μm, width 0.8 mm, warp pitch 10 mm, diagonal thread: flat yarn thickness 44 μm, width 0.8 mm, diagonal thread pitch 25 mm, open area ratio 89%)
M6: Polyethylene net (warp: flat yarn thickness 66 μm, width 0.8 mm, warp pitch 10 mm, diagonal thread: flat yarn thickness 66 μm, width 0.8 mm, diagonal thread pitch 25 mm, open area ratio 89%)
M7: Polyethylene net (warp: monofilament diameter 280 μm, warp pitch 10 mm, diagonal thread: flat yarn thickness 66 μm, width 0.8 mm, diagonal thread pitch 25 mm, opening ratio 84%)
M8: Polyethylene net (monofilament diameter 330 μm, warp pitch 8 mm, diagonal thread pitch 25 mm, aperture ratio 87%)
M9: Polyethylene net (warp: flat yarn thickness 33 μm, width 0.8 mm, warp pitch 10 mm, diagonal yarn: flat yarn thickness 33 μm, width 0.8 mm, diagonal yarn pitch 25 mm, opening ratio 89%)
In the table, MF is a monofilament, FY is an abbreviation of flat yarn, and a number means a diameter of μm.

  As apparent from the results of the examples, the pressure-sensitive adhesive tape of the present invention has the function of adjusting the position of the adherend, and has developed a good adhesive force to the adherend. On the other hand, in the pressure-sensitive adhesive tape of the comparative example, the position adjusting function of the adherend and the adhesive force were not compatible.

ADVANTAGE OF THE INVENTION According to this invention, it is used suitably, for example, when fixing the carpet of an aircraft to an aircraft housing, position adjustment of a carpet can be performed easily at the time of fixing operation, and after fixing, it expresses good adhesion to a carpet. Pressure sensitive adhesive tape can be provided.
The pressure-sensitive adhesive tape of the present invention is a double-sided adhesive tape provided with a non-adhesive masking member on one surface of the pressure-sensitive adhesive layer and satisfying the predetermined requirements, and having a removable adhesive layer on the other surface. Furthermore, in the case of carpet replacement of an aircraft, there is an effect that the adhesive residue to the aircraft housing is small and the removability is excellent.

DESCRIPTION OF SYMBOLS 10 pressure-sensitive adhesive tape 11 pressure-sensitive adhesive layer 11a pressure-sensitive adhesive layer surface 12 non-adhesive masking member 12a-12d filament tape 13 base 14 re-peeling adhesive layer 20 adherend 21, 23a, 23b opening 22, 24 net

Claims (9)

A non-adhesive masking member is provided on at least one surface of the acrylic pressure-sensitive adhesive layer,
The tensile storage elastic modulus at 23 ° C. of the pressure-sensitive adhesive layer is 5.0 × 10 ^{4 to} 1.0 × 10 ⁷ Pa,
The ratio of the area of the portion coated with the non-adhesive masking member on the surface of the pressure-sensitive adhesive layer is 5 to 11%,
And the pressure-sensitive adhesive tape whose ratio of the minimum height from the said pressure-sensitive adhesive layer surface to the said non-adhesive masking member is 14 to 50% with respect to the thickness of the said pressure-sensitive adhesive layer.   The pressure-sensitive adhesive layer contains a (meth) acrylic acid ester-based polymer (A) and a non-halogen phosphate-based flame retardant (B), and the component (B) with respect to 100 parts by mass of the component (A) The pressure-sensitive adhesive tape according to claim 1, wherein the content is 1.0 to 60 parts by mass.   1 type selected from the group consisting of hydroxyphenyl phosphate, resorcinol bis phenyl phosphate, bisphenol A bis diphenyl phosphate, and resorcinol bis di-2, 6-xylenyl phosphate as the non-halogen phosphoric acid ester flame retardant (B) The pressure-sensitive adhesive tape according to claim 2, which is the above.   The pressure-sensitive adhesive tape according to any one of claims 1 to 3, wherein the thickness of the pressure-sensitive adhesive layer is 0.1 to 2.0 mm. The pressure-sensitive adhesive tape according to any one of claims 1 to 4, wherein the temperature at which the tensile storage modulus of the pressure-sensitive adhesive layer is 1.0 x 10 ⁴ Pa or less is 205 ° C or less.   The pressure-sensitive adhesive tape according to any one of claims 1 to 5, wherein the pressure-sensitive adhesive layer further contains fine particles.   The pressure-sensitive adhesive tape according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive layer further contains a tackifying resin.   The pressure-sensitive adhesive tape according to any one of claims 1 to 7, wherein the non-adhesive masking member is provided on one surface of the pressure-sensitive adhesive layer, and the base is provided on the other surface.   The pressure-sensitive adhesive tape according to claim 8, further comprising a removable adhesive layer on the substrate.