JPH04323286A - Sheet for adhesion - Google Patents

Abstract

PURPOSE:To obtain a sheet having high peeling strength in layer of interlaced material of fibers and excellent creep characteristics, comprising a sheet of interlaced material of fiber consisting essentially of fine fiber having a noncircular section prepared by dividing a layer split type conjugate fiber composed of plural thermoplastic polymers as a ground fabric. CONSTITUTION:The objective sheet obtained by using a fiber sheet which comprises an interlaced material of fiber consisting essentially of fine fiber having a noncircular section prepared by at least partially dividing a layer split type conjugate fiber composed of plural thermoplastic polymers such as polyethylene terephthalate or nylon as a ground fabric, having <=1 denier fineness (preferably 0.8-0.001 denier average fineness) and has >=3kg/25mm ply separation strength, as a ground fabric, providing at least one side of the ground fabric with a tacky agent layer and laminating a release sheet to the tacky agent layer.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to adhesive sheets used in the manufacture of buildings and structures.

0002

[Prior Art] Conventionally, adhesive tapes used for packaging, which are made of a base cloth made of woven fabric or other fabric and coated with a rubber adhesive, and double-sided adhesive tapes, which are made by laminating release paper on a pressure-sensitive adhesive sheet. It has been known. In addition, adhesive tapes using nonwoven fabric as the base fabric are also available, for example, as disclosed in Japanese Utility Model Application Publication No. 2-53950.
No. 2-149275, Japanese Utility Model Application No. 3-1
This method has been proposed in Publication No. 1040, etc. however,
No effective proposals have been made regarding adhesive sheets provided with a strong adhesive layer.

0003

[Problems to be Solved by the Invention] In conventional adhesive sheets based on textile fabrics, even if adhesives with excellent adhesive properties are used, the peel strength between the base fabric and the adhesive layer is weak. It cannot be used as a structural adhesive tape. On the other hand, adhesive tapes with non-woven fabric as the base fabric show a somewhat high value in terms of peel strength between the base fabric and the adhesive layer, but the intralayer peel strength (structural destruction strength) of non-woven fabric is low, making the adhesive tape If strong shear stress or tensile stress is applied to the structural material bonded via the adhesive, there is a problem in that the nonwoven fabric layer easily peels off.

As a means to solve the above problem, attempts have been made to use a base fabric obtained by incorporating a commonly used acrylic resin binder or synthetic rubber binder into a nonwoven fabric.
It was not possible to obtain a base fabric that maintains flexibility, increases interlayer peel strength, and has improved creep properties.

[0005] An object of the present invention is to provide a pressure-sensitive adhesive sheet that has high strength in interlayer peeling (structural destruction) of the base fabric and excellent creep properties.

[0006]

[Means for Solving the Problems] The present invention provides at least two
Layered split composite fibers made of different types of thermoplastic polymers,
The base fabric is a fiber sheet consisting of an entangled body of fibers mainly consisting of fine fibers with a non-circular cross section with a fineness of 1 denier or less and having a delamination strength of 3 kg/25 mm or more, which is at least partially split. Provide an adhesive layer on at least one side,
Moreover, the adhesive sheet is formed by laminating a release sheet on the adhesive layer.

The base fabric used for the adhesive sheet of the present invention is polyester such as polyethylene terephthalate, polybutylene terephthalate, isophthalic acid copolymerized polyethylene terephthalate, 6-nylon, 66-nylon, 6
10-Physical properties from thermoplastic polymers such as polyamides such as nylon, polyolefin polymers such as polyethylene, polypropylene, ethylene propylene copolymers, ethylene vinyl acetate copolymers, or their saponified products, polyester elastomers, polycarbonates, etc. Alternatively, a fiber obtained by selecting two or more polymers with different chemical properties and spinning them into a layered split composite fiber in which each polymer is joined in layers in the cross section of the fiber, and finally at least a portion is split. A splittable conjugate fiber which forms ultrafine fibers with a non-circular cross section having a fineness of 1 denier or less, preferably an average fineness of 0.8 to 0.001 denier, is used as the main fiber. By using non-circular cross-section fibers formed by splitting layered split composite fibers, they are easier to bend and twist than normal round or triangular cross-section fine fibers of the same fineness.
Since a highly entangled fiber body can be formed without using strong entanglement treatment means, fiber sheets with high interlayer peel strength can be produced with less damage to the fibers due to entanglement treatment. Furthermore, if the fineness of the split fine fibers is outside the above range, it may not be possible to entangle the fibers to obtain sufficient interlayer peel strength, or the strength of the fine fibers may decrease, making it impossible to obtain sufficient interlayer peel strength.

[0008] In addition, when it is desired to increase the interlayer peel strength of the fiber sheet and improve the creep property, it is possible to use fibers made of a polymer having a melting point at least 30°C lower than the melting point of the splittable composite fibers, or The conjugate fibers whose union forms at least a portion of the fiber surface are mixed into the layered splittable conjugate fibers as thermal binder fibers, and the fibers are bonded and fixed with the thermal binder fibers. The amount of thermal binder fibers mixed is 5 to 30% by weight of the fiber sheet, and if the amount of thermal binder fibers mixed is large, the fiber sheet will be hardened and its flexibility as a base fabric of the adhesive sheet will decrease.

[0009] Fibers mainly composed of splittable composite fibers are made into a fiber web by a conventional method such as a dry method or a wet method, and the fiber web is laminated in one layer or a plurality of layers, or the fiber web is coated on one or both sides of a textile fabric. After lamination, the fiber sheet is treated by an entangling method such as a needle punch method or a high-pressure water treatment method, so that the interlayer peel strength of the obtained fiber sheet is at least 3 kg/
The fibers are highly entangled to form a fiber entangled body having a length of 25 mm. If the interlayer peeling strength of this fiber sheet does not reach 3 kg/25 mm, the stress applied to the adhesive may cause structural destruction of the fiber sheet, or the creep properties may deteriorate, making it impossible to use it as a structural adhesive sheet. .

In order to increase the interlayer peeling strength of a fiber sheet, for example, an active agent or one component of the fibers is added to the fiber aggregate such as a fiber web made using layered split composite fibers before the entanglement treatment. Split by mechanical, physical, or chemical means, such as treatment in warm water containing a treatment agent such as a swelling agent, heat treatment, or high-pressure water entanglement treatment with hot water containing a treatment agent. At least a portion of the composite fiber is divided into fine fibers. In addition, the thickness of the obtained fiber sheet is appropriately selected depending on the application, but is usually 0.4~
A range of 3 mm is preferred.

[0011] Also, the apparent density of the fiber sheet is 0.10
~0.40g/cm3, and JIS L-1096,
6.20.1 It is preferable that the bending resistance value measured by method A (Gurley method) is 3000 mgf or less, preferably in the range of 2000 to 150 mgf when converted to a base fabric thickness of 1 mm. The apparent density of the fiber sheet is 0.10g/cm3
If it is less than this, shape stability, creep properties, interlayer peeling strength, etc. may be impaired. In particular, a fiber sheet with a low apparent density and a high bending resistance value is undesirable because it produces corrugated cardboard-like folds. In addition, if the apparent density exceeds 0.40 g/cm3, the adhesive will not penetrate into the fiber sheet, resulting in no anchoring effect, and the adhesive strength with the adhesive and flexibility as a base fabric may be impaired. There is. Furthermore, if the bending resistance value of the fiber sheet exceeds 3000 mgf, the fiber sheet may become hard and the shaping properties of the adhesive tape may deteriorate. Further, a fiber sheet having a bending resistance value of less than 150 mgf is not preferable because it has poor shape stability and creep properties, and may have a reduced interlayer peel strength. Intralayer peel strength is 3Kg
By using a fiber sheet that satisfies /25mm or more as the base fabric, it has excellent flexibility, morphological stability, and creep properties, and the adhesive strength between the adhesive layer and the base fabric can be increased, making it an adhesive sheet. It can be done.

The adhesive used in the present invention is selected from commonly used adhesives such as acrylic adhesives, silicone adhesives, and rubber adhesives depending on the object to be adhered. The method of forming an adhesive layer on a fiber sheet is, for example,
A method in which an adhesive solution or dispersion is applied to a fiber sheet by a roll coating method, a spray method, a curtain coating method, etc. A method in which a melted adhesive is applied to a fiber sheet by a roll coating method, A method in which an adhesive layer is applied on a release paper For example, a method of forming a fiber sheet and transferring it onto a fiber sheet. Furthermore, a release sheet is applied to the surface of the adhesive to obtain an adhesive sheet.

Since the adhesive sheet of the present invention uses a highly flexible fiber sheet with high interlayer peeling strength, it has good adhesion to adherends and can be used as flooring and wall materials in buildings and structures. It is useful for fixing floor mats, carpets, etc., fixing automobile seats and interior materials, fixing name plates of electrical equipment, fixing wiring equipment, fixing artificial turf, heavy packaging/packing, fixing molded products, etc.

[0014] The fibers used in the present invention will be explained below with reference to the drawings. FIG. 1 is a schematic diagram of a fiber sheet for base fabric, and is a schematic diagram of a fiber sheet in which fibers mainly consisting of fine fibers 2 split from a layered splittable conjugate fiber 1 are entangled. FIG. 2 is a schematic cross-sectional view of a layered split type conjugate fiber, which is a conjugate fiber formed by bonding two types of polymer components I (3) and polymer II (4) with different properties in a layered manner.

[0015]

[Operation] The present invention is characterized by the fact that at least a part of the layered split-type composite fiber is split to form an aggregate of fibers mainly consisting of fine fibers with a non-circular cross section. By entanglement, a fiber sheet having a delamination strength of 3 kg/25 mm or more can be obtained. By using the fiber sheet as a base fabric, it is possible to obtain a pressure-sensitive adhesive sheet that is highly flexible, has excellent shape stability and creep properties, and has high adhesive strength between the fiber sheet and the pressure-sensitive adhesive.

[0016]

[Example] Next, embodiments of the present invention will be explained with reference to Examples. In addition, parts and percentages in the examples refer to weight unless otherwise specified.

[0017] The method for measuring the intralayer peeling strength is as follows:
A thick rubber plate was pasted with rubber adhesive on one side or both sides of the sample cut to 200 mm in length.
After being left in an atmosphere of ℃ and 65% RH for one day, the rubber plate -
The end of the sample or rubber plate-rubber plate is fixed to the chuck of a tensile tester, pulled at a speed of 20 cm/min, the average value is read from the graph of recorded peel strength, and that value is calculated as intralayer peeling (structural destruction). ) made powerful.

Example 1 Polyethylene terephthalate with a solution viscosity [η]=0.68 and 6-nylon with a melt flow rate of 4.9 g/10 at 275° C. and 325 g were charged into each melting system and melted. , a composition ratio of 50:50 was supplied to the spinning head, and a 16-component layered segmented polymer stream was formed through a 4-element static mixer, and the spinning temperature was 290°C.
Spun at a winding speed of 1000 m/min, stretched in hot water,
A layered split type conjugate fiber with a single fiber fineness of 2 dr was obtained by heat setting and each component was bonded in layers.

After mechanically crimping the layered split-type composite fibers, a fiber oil was applied and the fibers were cut into fibers of 38 mm in length, passed through a card machine and a random webber to form a fiber web with an average basis weight of 70 g/m2, and then 3 After laminating the sheets, the needle penetration density was set to 200 punches/cm2 using a #40 needle.
The fiber sheet was then needle-punched alternately from both sides. This fiber sheet was immersed in 90°C hot water containing a surfactant for 30 minutes.
The fibers were treated for minutes to split most of the splittable conjugate fibers to obtain fine fibers with a flat cross section (calculated fineness of 0.125 dr). Next, the orifice diameter is 0.1 mm, and the orifice interval is 1 m.
80℃ containing surfactant using a high-pressure water treatment machine of
of hot water, the first stage has a water pressure of 25 kg/cm2, the second stage has a water pressure of 50 kg/cm2, and the third and fourth stages have a water pressure of 95 kg/cm2.
The fiber sheet is entangled with a cm2 high-pressure water stream, dried,
Press heat treatment was performed using a hot drum surface and a wire mesh. The physical properties of the obtained fiber sheet were as follows. Average basis weight 235g/m2, apparent density 0.21g/cm3, average thickness
1.12mm, strong intralayer peeling
3.1Kg/25mm, Gurley method bending resistance
Average 205mgf (1mm thickness conversion value),

Using this fiber sheet as a base fabric, an acrylic adhesive film formed on a release paper was applied to both sides of the base fabric by a transfer method, and a release sheet was further laminated to obtain an adhesive sheet. When this adhesive sheet was used to fix floors and wall panels in buildings, it had good adhesion to adherends, and there was no deformation of the fixed part due to creep, resulting in good fixation.

Example 2 80 parts of the layered split type composite fiber made of polyethylene terephthalate/nylon of Example 1 was used as a thermal binder fiber with a fineness of 2 dr and a fiber length of 38 mm, the core component being polyethylene terephthalate and the sheath component being modified polyester (melting point 1).
35℃) 20 parts of core-sheath type composite fibers were mixed, and a carding machine was used.
A fiber web with an average basis weight of 40g/m2 is made using a random webber, and then laminated with a cross wrapper to obtain an average basis weight of 80g.
/m2 of fiber web, needle-punched alternately from both sides to a needle punch density of 120 punches/cm2 using a #40 needle to obtain a preliminary fiber sheet, and then subjected to fiber division treatment in the same manner as in Example 1, A fiber sheet in which the fiber sheet is entangled with high-pressure water jets, dried, and then press-heat treated with a heated drum surface at 150°C and a wire mesh stretched over the drum surface, and at least a portion of the intersection points of the fibers are fixed with thermal binder fibers. I got it. The physical properties of this fiber sheet were as follows. Average basis weight 93g/m2, apparent density 0.23g/cm3, average thickness
0.40mm, strong intralayer peeling
4.1Kg/25mm, Gurley method bending resistance 3
53mgf (1mm thickness conversion value),

Using this fiber sheet as a base cloth, a melted acrylic adhesive was applied to both sides by roll coating, and a release sheet was further laminated to obtain an adhesive sheet. When this adhesive sheet was used to fix a vehicle interior material, it had good adhesion to the adherend, and there was no deformation of the fixing part due to creep, resulting in good fixation.

Example 3 Layered split type composite fiber 80 made of polyethylene terephthalate nylon of Example 1 cut into fiber length 15 mm
and 20 parts of a core-sheath type composite fiber whose core component is polyethylene terephthalate and whose sheath component is modified polyester (melting point 135°C), cut into pieces with a fineness of 2 dr and a fiber length of 15 mm as a thermal binder fiber, are mixed, and an average of Weight: 50g
A fiber web of /m2 was made and placed on a wire mesh as a fiber aggregate laminated on both sides of a coarse knitted fabric, and a high-pressure water treatment machine with an orifice diameter of 0.1 mm and an orifice spacing of 1 mm was used to prepare a fiber web containing a surfactant. With hot water at 80℃, the first stage has a water pressure of 25 kg/cm2, the second stage has a water pressure of 50 kg/cm2, 3
In the fourth and fourth stages, the fiber aggregate is entangled with a high-pressure water stream of 95 kg/cm2, dried, and then press heat treated with a heated drum surface at 150°C and a wire mesh stretched over the drum surface to form a thermal binder. A fiber sheet was obtained in which at least some of the intersection points of the fibers were fixed with fibers. The physical properties of this fiber sheet were as follows. Average basis weight 190g/m2, apparent density 0.26g/cm3, average thickness
0.73mm, strong intralayer peeling
3.9Kg/25mm, Gurley method bending resistance
386mgf (1mm thickness conversion value),

Using this fiber sheet as a base fabric, an acrylic adhesive film formed on a release paper was applied to both sides of the base fabric by a transfer method, and a release sheet was further laminated to obtain an adhesive sheet. When this adhesive sheet was used for laying and fixing a tile carpet, it had good adhesion to the adherend, and there was no deformation of the fixing part due to creep, resulting in good fixation.

[0025]

Effects of the Invention The adhesive sheet of the present invention is highly flexible, has good adhesion to adherends, has high intralayer peeling strength of the base fabric, and has excellent creep properties, so it has a structure It is suitable for use as a pressure-sensitive adhesive sheet.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a fiber sheet used as the base fabric of the adhesive sheet of the present invention.

FIG. 2 is a schematic cross-sectional view of a layered splittable composite fiber used in the present invention.

[Explanation of symbols]

1 Layered split type composite fiber part, 2. Split fine fiber part, 3 Polymer component I, 4 Polymer component II.

Claims (1)

[Claims] Claim 1: Consists of an entangled body of fibers consisting mainly of fine fibers with a fineness of 1 denier or less and a non-circular cross section, which are made by splitting at least a portion of layered split type composite fibers made of at least two types of thermoplastic polymers. , delamination strength is 3kg/2
An adhesive sheet comprising a fiber sheet having a thickness of 5 mm or more as a base fabric, an adhesive layer provided on at least one surface of the base fabric, and a release sheet laminated on the adhesive layer.