JP2003193026A - Peeling treating agent and peeling part using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a peeling treating agent easily peeling a pressure-sensitive adhesive layer during peeling without producing a large sound during the peeling while having high holding properties during fixing without causing problems about environmental hygiene, disaster prevention, safety, or the like, without deteriorating holding power even when repeating fixing and peeling even several times, and to provide a peeling part using the same. <P>SOLUTION: The peeling treating agent comprises (A) a polyorganosiloxane of a three-dimensional structure comprising 0.5-20 mol% of siloxane units having epoxy group in one molecule, (B) a polyorganosiloxane of a two-dimensional structure having epoxy group in one molecule and (C) a photo-curing catalyst. The peeling part is obtained by composing a peeling treating agent layer of the peeling treating agent. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peeling treatment agent used for a peeling portion of a disposable diaper and a peeling portion using the same.

[0002]

2. Description of the Related Art Generally, at a peeling portion of a paper diaper to which an adhesive tape is fixed, while the diaper is attached,
The adhesive tape is hard to peel off to prevent leakage and displacement,
On the other hand, when the diaper is attached / detached, the adhesive tape is required to be easily peeled from the diaper.

For this reason, conventionally, as the adhesive of the adhesive tape, one which can easily obtain high adhesion is used, while a reinforcing film is provided on the front part of the paper diaper in order to facilitate the peeling, and the adhesive is adhered to the surface when fixed. It has been performed to apply a long-chain alkyl-based peeling treatment agent having a high holding property such that the tape is hard to peel off.

However, although this long-chain alkyl-based release treating agent has excellent properties (high retention at the time of fixing and easy peeling at the time of detaching) capable of satisfying the above-mentioned requirements, it is attempted to remove the adhesive tape from the reinforcing film. When doing, there was a difficulty in making a loud noise. Such a peeling sound not only awakens or surprises the sleeping baby and the people around it, but also the person who handles the diaper often feels uncomfortable.

On the other hand, when a solvent-diluted addition reaction type silicone release treatment agent which is widely used for adhesive tapes is used,
At the time of peeling, the above-mentioned sound is not generated, and the chart pattern of the peeling force becomes smooth. However, the shear adhesive strength of the pressure-sensitive adhesive tape to the adhesive layer is weak, and the pressure-sensitive adhesive tape is easily peeled off during fixing. Besides,
Since a large amount of solvent is used during manufacturing, there are problems in terms of environmental hygiene, disaster prevention and safety, and energy saving.

[0006]

As described above, the long-chain alkyl-based peeling treatment is used in applications such as a peeling portion of a paper diaper, which requires high retention at the time of fixing and easy peeling at the time of desorption. Agents have been used. However, although this long-chain alkyl-based release treating agent has high retainability at the time of fixing and easy release at the time of desorption, there is a problem that a loud noise is produced at the time of releasing. On the other hand, solvent-diluted addition reaction type silicone release agents have good sound deadening properties, but lack high retention when fixed, and use a large amount of solvent during manufacturing, which further contributes to environmental hygiene and disaster prevention and safety. Had problems in terms of energy saving.

Further, recently, in order to further improve the convenience, it has been strongly demanded that the high holding power is not impaired even if adhesion (fixing) and peeling of the adhesive tape are repeated many times.

The present invention has been made in consideration of such a point, and has a high holding property at the time of fixing, and at the time of peeling, it can be easily peeled without making a loud sound, and An object of the present invention is to provide a release treatment agent that does not have any problems in terms of environmental hygiene and disaster prevention safety, and that does not impair the holding power even if fixing and peeling are repeated many times and a peeling section using the same. I am trying.

[0009]

Means for Solving the Problems The present inventor has conducted extensive studies to achieve the above object, and as a result, has a three-dimensional structure containing 0.5 to 20 mol% of siloxane units having an epoxy group in one molecule. By using two specific types of UV-curable silicones, namely, polyorganosiloxane of 2 and polyorganosiloxane with a two-dimensional structure having an epoxy group in one molecule, high retention at the time of fixing and excellent sound-damping release property In addition, since it is a solvent-free type, it is possible to solve problems such as environmental hygiene and disaster prevention safety, and it is possible to maintain high holding power even if fixing and peeling are repeated. Heading out, the present invention has been completed.

That is, the release treating agent of the invention according to claim 1 of the present application is (A) a polyorganosiloxane having a three-dimensional structure containing 0.5 to 20 mol% of a siloxane unit having an epoxy group in one molecule, (B). ) A polyorganosiloxane having a two-dimensional structure having an epoxy group in one molecule, and (C) a photocuring catalyst.

The stripping agent of the invention according to claim 2 of the present application is the stripping agent of the invention of claim 1 in which (A)
The compounding ratio of the component and the component (B) is 99: 1 to 50:50 by weight.

The stripping agent of the invention of claim 3 of the present application is the stripping agent of the invention of claim 1 or 2, wherein the component (C) is a diaryl iodonium salt. .

In the peeling portion of the invention according to claim 4 of the present application, in the peeling portion where the pressure-sensitive adhesive layer and the peeling treatment agent layer are releasably adhered, the peeling treatment agent layer is (A). 1
0.5 to 20 siloxane units having an epoxy group in the molecule
A polyorganosiloxane having a three-dimensional structure containing mol%,
It is characterized by comprising (B) a polyorganosiloxane having a two-dimensional structure having an epoxy group in one molecule, and (C) a release treatment agent containing a photocuring catalyst.

The peeling portion of the invention of claim 5 of the present application is the peeling portion of the invention of claim 4, wherein the pressure-sensitive adhesive layer and the peeling treatment agent layer are peeled at a peeling speed of 300 mm / min. The peeling force of is not less than 500 gf / 25 mm.

According to a sixth aspect of the present invention, in the peeling portion of the fourth or fifth aspect of the present invention, the pressure-sensitive adhesive layer is composed of a hot-melt type adhesive containing rubber as a main component. It is characterized by that.

In the release treating agent of the present invention, (A) 1
0.5 to 20 siloxane units having an epoxy group in the molecule
By using the polyorganosiloxane having a three-dimensional structure containing mol% and the polyorganosiloxane having a two-dimensional structure having an epoxy group in one molecule in combination, it is possible to achieve a heavy release of the silicone-based release treatment agent and to achieve good noise reduction. It is possible to maintain the property, and it is excellent in both the high retention property at the time of fixing and the sound absorbing peeling property. Further, since it is an ultraviolet curable type, problems such as environmental hygiene and disaster prevention safety due to the use of a solvent such as a conventional release treatment agent can be solved. Further, the high holding power at the time of fixing is maintained even after the adhesion and peeling of the pressure-sensitive adhesive layer and the peeling treatment agent layer are repeated many times.

In the peeling portion of the present invention, since the peeling treatment agent layer is constituted by the peeling treatment agent which is excellent and maintains both the high retaining property at the time of fixing and the muffling peeling property as described above, peeling occurs at the time of fixing. It is difficult, and can be easily peeled without making a loud noise when peeling,
Moreover, these characteristics are not greatly impaired even if fixing and peeling are repeated many times.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The release treatment agent of the present invention is (A) a polyorganosiloxane having a three-dimensional structure containing 0.5 to 20 mol% of a siloxane unit having an epoxy group in one molecule, (B) 1
It contains a two-dimensional polyorganosiloxane having an epoxy group in the molecule and (C) a photocationic curing catalyst.

The polyorganosiloxane of component (A) is
(M unit represented by the following general formula [I]), the following general formula [I
The D unit represented by I] and the following general formula [III]
0.5 to 20 mol% of at least one of the T units, preferably
1.0 to 15 mol%, more preferably 1.0 to 10 mol%
It is a polyorganosiloxane with a three-dimensional structure and has the general formula
As the structural unit other than [I] to [III], a general formula
In each of [I] to [III], X is substituted with R.
M unit, D unit and T unit, and Q unit (Si
O ₂) Is mentioned. The ratio of these constituent units is
The general formulas [I] to [III] are not limited to
The total number (that is, polymerization
The degree) is usually about 30 to 200.

The polyorganosiloxane as the component (B) is a polyorganosiloxane having a two-dimensional structure having M units represented by the following general formula [I]) and / or D units represented by the following general formula [II]. Examples of the constitutional units other than the general formulas [I] and [II] include M units and D units in which X is substituted with R in the general formulas [I] and [II]. The ratio of these structural units is not particularly limited, but the total number (that is,
The degree of polymerization) is usually about 20 to 200, and the content of M unit represented by the following general formula [I] and / or D unit represented by the following general formula [II] is 0.5 to 30 mol%. Is the range.

R ₂ XSiO _0.5 ... [I] RXSiO ... [II] XSiO _1.5 ... [III]

In the general formulas [I] to [III], R is
One kind or two or more kinds may be present in the molecule, and it is a hydrocarbon group having 1 to 10 carbon atoms. Specifically, methyl,
Alkyl groups such as ethyl, propyl, butyl, pentyl, hexyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl; cycloalkyl groups such as cyclohexyl; alkenyl groups such as vinyl and allyl; aryl groups such as phenyl; 2-phenyl ethyl,
Examples thereof include aralkyl groups such as 2-phenylpropyl; halogenated alkyl groups such as chloromethyl and trifluoropropyl. In addition, X is an epoxy group,
There is no particular limitation as long as the ring-opening cationic polymerization proceeds with the photocuring catalyst as the component (C). Specific examples include a γ-glycidyloxypropyl group, a β- (3,4-epoxycyclohexyl) ethyl group, a β- (4-methyl-3,4-epoxycyclohexyl) propyl group, and the like.

The polyorganosiloxane of each of the above components (A) and (B) may be used alone or in combination of two or more.

In the present invention, it is particularly preferable to use, as the polyorganosiloxane of each of the components (A) and (B), one in which R is a methyl group in the above general formulas [I] to [III].

In the present invention, the compounding ratio (A) :( B) of the polyorganosiloxane as the component (A) and the polyorganosiloxane as the component (B) is 99: 1 to 50:50 by weight.
When the blending amount of the polyorganosiloxane of the component (B) is less than the above range, the peeling force is sufficient but the effect of improving the peeling noise becomes small. On the contrary, if the amount of the polyorganosiloxane as the component (B) exceeds the above range, the peeling noise may be improved but the peeling force may be insufficient. A more preferable range of the compounding ratio (A) :( B) of both components is 95: 5 to 60:40.

In place of the component (A), at least one of M units represented by the general formula [I], D units represented by the general formula [II] and T units represented by the general formula [III] is used.
When a polyorganosiloxane having a three-dimensional structure containing less than 0.5 mol% of a seed is blended, the peeling noise can be reduced, but at the same time, the peeling force is also reduced, and a sufficient holding function at the time of fixing is obtained. Not obtained, conversely exceeding 20 mol% 3
Even if the polyorganosiloxane having a dimensional structure is blended, the peeling force is sufficient, but the peeling noise is not improved.

Known photocuring catalysts as the component (C) are known.
It is possible to use Ar, but especially Ar₂I⁺X^-
The diaryl iodonium salt represented by
Be done. However, Ar represents an aryl group, X^-as,
SbF₆ ^-, AsF₆ ^-, BF_Four ^-, PF₆ ^-, SbCl₆ ^-, H
SO_Four ^-, ClO_Four ^-, [B (C₆H_Five)_Four]^-, [B (C
₆F_Five) _Four]^-, [B (C₆H_FourCF₃)_Four]^-, [(C₆H_Five)₂B
F₂]^-, [C₆H_FiveBF₃]^-, [B (C₆H₃F₂)_Four]^-Such
Is mentioned. In the present invention, particularly bis (dodecyl)
Phenyl) iodonium hexafluoroantimonate
Is preferably used.

The compounding amount of such a photocationic curing catalyst as the component (C) is not particularly limited, but is usually
The amount is 0.3 to 10 parts by weight, preferably 0.5 to 6.0 parts by weight, based on 100 parts by weight of the total of the components (A) and (B). If the amount of the photocuring catalyst is less than 0.3 parts by weight, the reaction (curing) properties of the polyorganosiloxanes of the components (A) and (B) will decrease, and if it is added in excess of 10 parts by weight, it will react (curing). ) The effect of improving the property becomes small.

In addition to the above components, the release treatment agent of the present invention improves the compatibility between the polyorganosiloxanes of the components (A) and (B) and the photo-curing catalyst of the component (C), and removes them. For the purpose of controlling characteristics, for example, Japanese Patent Laid-Open No. 4-12
Polyether compounds as described in JP-A-6767, alkylphenols having 8 to 16 carbon atoms and phenol-alkyl-substituted organodisiloxanes as described in JP-A-3-115425, JP-A-4-11
You may mix | blend (alpha) -methyl styrene type compounds, a p- substituted styrene compound, etc. which are described in the 678 gazette.

Next, the peeling portion of the present invention will be described.
The peeling section of the present invention has a peeling treatment agent layer made of the above-mentioned peeling treatment agent, and a pressure-sensitive adhesive layer that is releasably adhered to the surface thereof.

As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, an adhesive containing rubber or acrylic as a main component can be mentioned. From the viewpoint of environmental hygiene, disaster prevention safety, energy saving, etc., hot melt is used. Preferred are styrene-isoprene block copolymers, styrene-isoprene-styrene block copolymers, styrene-butadiene-styrene block copolymers, styrene-ethylene-butadiene-styrene block copolymers, and the like. Those containing a hydrogenated substance as a main component are preferably used.

The pressure-sensitive adhesive layer is formed by coating the above-mentioned pressure-sensitive adhesive on a support by a conventional method.

On the other hand, the release treatment agent layer is formed by applying the above-mentioned release treatment agent on a support and then irradiating it with ultraviolet rays.

The type of the support is not particularly limited, and includes polyolefins such as polyethylene and polypropylene, plastic films such as polyester, nylon and cellophane, paper base materials such as high-quality paper, Clupak paper and glassine paper, non-woven fabrics or woven fabrics. A cloth base material such as cloth or a composite base material in which these cloth base materials and a plastic film are laminated can be appropriately selected and used according to the application. In the present invention, among them, a polyethylene film is preferably used because of its softness and good feel to the touch. If necessary, these support materials may be subjected to surface treatment such as corona discharge treatment, embossing, printing or the like.

To apply the release treating agent to the above support, a known coating apparatus such as a direct gravure coater, an offset gravure coater, a bar coater, a die coater can be used. The form of application is not particularly limited, and for example, it may be applied to the entire one surface of the support, or may be applied partially only to the portion in contact with the pressure-sensitive adhesive layer. Further, the coating amount of the release treatment agent is usually 0.1 to 5 g /
m ² , preferably 0.1 to ² g / m ² . Coating amount is 0.1g / m ²
If it is less than the above range, it becomes difficult to apply it uniformly on the surface of the support, and uneven coating and pinholes are likely to occur.
Further, even when the coating amount exceeds 5 g / m ² , the peeling property does not change so much.

Further, when the release treatment agent is coated on the support in this way and then irradiated with ultraviolet rays, for example, known ultraviolet irradiation such as a high pressure mercury lamp with electrodes, a metal halide lamp, or an electrodeless microwave lamp is used. A device can be used.

In the peeling portion of the present invention, the peeling force when peeling the pressure-sensitive adhesive layer and the peeling treatment agent layer at a peeling speed of 300 mm / min is 500 in order to obtain a high holding property at the time of fixing.
It is preferably set to gf / 25 mm or more.

The peeling portion of the present invention can be widely applied as a peeling portion structure for a disposable diaper, a sanitary napkin, a medical tape, a packaging tape and the like.

FIG. 1 shows an example in which the peeling portion of the present invention is applied to a disposable diaper. In FIG. 1, reference numeral 11 denotes a back sheet of a disposable diaper, and a plastic film 13 having a release treatment agent layer 12 formed on the surface thereof is adhered to the back sheet 11 of the disposable diaper by an adhesive agent 14. . On the other hand, on the top sheet 15 of the belt portion of the disposable diaper, one end of the adhesive tape 18 having the pressure sensitive adhesive layer 17 formed on the tape support 16 is attached to the adhesive 1
Bonded by 9. Then, the pressure-sensitive adhesive layer 17 of the pressure-sensitive adhesive tape 18 is pressed onto the release treatment agent layer 12, whereby the pressure-sensitive adhesive layer 16 and the release treatment agent layer 12 are releasably adhered. The release agent layer 12 may be directly provided on the back sheet 11 of the diaper, or the plastic film 13 may be directly thermocompression-bonded to the back sheet 11 of the diaper without using the adhesive 14. Good.

In such a peeling portion, since the peeling treatment agent layer 12 is composed of a peeling treatment agent having a high retaining property at the time of fixing and a sound-proof peeling property, the adhesive tape 18 is hard to be peeled off at the time of fixing, In addition, upon peeling, the peeling can be easily performed without making a large peeling noise.

[0041]

EXAMPLES Next, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples. In the following description, "part" means "part by weight"
Shall be indicated.

Example 1 As a siloxane unit having an epoxy group, a three-dimensional structure containing 5 mol% of M unit of R in the general formula [I] where R is a methyl group and X is a β- (3,4-epoxycyclohexyl) ethyl group. Structure of polydimethylsiloxane (Silicone (A1)
95 parts and R in the general formula [I] is a methyl group,
X was mixed with 5 parts of polydimethylsiloxane having a two-dimensional structure having M units of β- (3,4-epoxycyclohexyl) ethyl group at both ends of the molecular chain (denoted as silicone (B1)),
Further, 1 part of bis (dodecylphenyl) iodonium hexafluoroantimonate as a photocationic curing catalyst was added to and mixed with this mixture to prepare a release treating agent.

Next, the obtained release treating agent was applied to one side of a polyethylene film having a thickness of 25 μm by an offset gravure coater under the conditions of a coating amount of 1 g / m ² and a coating speed of 20 m / min. (F-450 (H bulb) manufactured by FUSION) was irradiated with ultraviolet rays (light amount 120 W / cm) and cured to form a release treatment layer.

Further, the hot-melt pressure-sensitive adhesive made of styrene-isoprene block copolymer was mixed with polypropylene and polyethylene (weight ratio 6: 4) at 95 μm.
A thick film (width 50 mm, length 150 mm, thickness 95 μm) is applied to one side with a thickness of 45 μm, and an adhesive tape (width 50 mm, length 15
0 mm) was produced.

This adhesive tape was pressure-bonded to the release treatment layer to form a release portion.

Examples 2 to 5 and Comparative Examples 1 to 3 A release treating agent was prepared in the same manner as in Example 1 except that the composition of the release treating agent was changed as shown in Table 1. A body was prepared. An adhesive tape produced in the same manner as in Example 1 was pressure-bonded onto the release-treated layer of this adherend to form a release portion.

In Example 5, instead of the silicone (B1) compounded in the other Examples, R in the general formula [I] was used.
Is a methyl group, X is a β- (3,4-epoxycyclohexyl) ethyl group at both ends of the molecular chain, and in the general formula [II], R is a methyl group and X is β- (3, Two-dimensional polydimethylsiloxane containing 2 mol% of D unit of 4-epoxycyclohexyl) ethyl group (silicone (B2)
2) and Comparative Example 1 were blended in each Example.
An example in which polydimethylsiloxane having a three-dimensional structure is not blended,
In Comparative Examples 2 and 3, the silicone (A
Instead of 1), as a siloxane unit having an epoxy group, in the general formula [I], R is a methyl group and X is β- (3,4-
Epoxycyclohexyl) 0.3 mol% of M unit of ethyl group
25 mol% of the M unit of polydimethylsiloxane having a three-dimensional structure (expressed as silicone (A2)) contained therein and R in the general formula [I] is a methyl group and X is a β- (3,4-epoxycyclohexyl) ethyl group. In this example, the contained polydimethylsiloxane having a three-dimensional structure (denoted as silicone (A3)) is used.

The peeling force was measured for the peeled portions obtained in each of the above Examples and Comparative Examples. The results are shown in Table 1. Further, the peeling force chart patterns recorded at that time at a peeling speed of 5 m / min are shown in FIGS.

Further, when the magnitude of the peeling noise when the pressure-sensitive adhesive tape was peeled off at a speed of 5 m / min was examined, as shown in Table 1, in all the Examples, the peeling noise was small and good results were obtained. It was In addition, the silicone (B
The peeling noise tended to decrease as the blending amount of 1) or silicone (B2) increased.

[0050]

[Table 1]

As is clear from Table 1 and the like, in the examples, the peeling sound characteristics were good and the peeling force was sufficient, whereas in the comparative example, the peeling force was low when the peeling sound was good. It was confirmed that the peeling noise was not improved when the peeling force was excessive and the peeling force was sufficient.

[0052]

As described above, according to the release treatment agent of the present invention, it is difficult to remove at the time of fixing, and at the time of peeling, it can be peeled off quietly and easily without producing a sound. It is possible to obtain a peeled portion in which the holding force is not impaired even if the step is repeated many times. In addition, since it is solvent-free, it contributes to environmental hygiene and disaster prevention and safety.
Further, it is also excellent in energy saving.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a peeling portion structure of a paper diaper which is an embodiment of a peeling portion of the present invention.

FIG. 2 is a diagram showing a peeling force chart pattern measured for an example of the present invention.

FIG. 3 is a diagram showing a peeling force chart pattern measured for an example of the present invention.

FIG. 4 is a diagram showing a peeling force chart pattern measured for a comparative example of the present invention.

[Explanation of symbols]

12 ... Release agent layer 13 ………… Plastic film 16 ... Tape support 17 ... Pressure-sensitive adhesive layer 18 ... Adhesive tape

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI theme code (reference) C09J 121/00 C09J 7/02 Z 183/04 A41B 13/02 J // C09J 7/02 F term (reference) ) 3B029 BD03 BD07 4J004 AA05 AA11 AB01 AB07 CB03 CC02 EA06 FA08 4J036 AK17 GA24 HA02 JA06 4J040 CA001 EK031 GA11 HD31 JB01 JB08 JB09 KA13 PA23

Claims (6)

[Claims] 1. A polyorganosiloxane having a three-dimensional structure containing (A) 0.5 to 20 mol% of a siloxane unit having an epoxy group in one molecule, and (B) a polyorganosiloxane having a two-dimensional structure having an epoxy group in one molecule. A release treatment agent comprising an organosiloxane and (C) a photocuring catalyst. 2. The release treating agent according to claim 1, wherein the compounding ratio of the component (A) and the component (B) is 99: 1 to 50:50 by weight. 3. The release treating agent according to claim 1, wherein the component (C) is a diaryliodonium salt. 4. In a peeling portion where a pressure-sensitive adhesive layer and a peeling treatment agent layer are releasably adhered to each other, the peeling treatment agent layer comprises (A) 0.5 to 10 siloxane units having an epoxy group in one molecule. Consisting of 10 mol% of a three-dimensional structure polyorganosiloxane, (B) a two-dimensional structure polyorganosiloxane having an epoxy group in one molecule, and (C) a release treatment agent containing a photocuring catalyst. A peeling part characterized by 5. The peeling force when peeling the pressure-sensitive adhesive layer and the peeling treatment agent layer at a peeling speed of 300 mm / min is 500 gf.
The peeling portion according to claim 4, wherein the peeling portion has a thickness of / 25 mm or more. 6. The peeling section according to claim 4, wherein the pressure-sensitive adhesive layer is made of a hot-melt type adhesive containing rubber as a main component.