JPH07313551A - Release tape for disposable paper diaper - Google Patents

Abstract

PURPOSE:To protect and temporarily attach release tapes up to use time, and smoothly separate at separating time by constituting a separation processing layer arranged on a base material out of a specific silicon type separation processing agent, setting the separating force not more than a specific value, and setting shearing adhesive strength not less than a specific value. CONSTITUTION:In release tapes E for a disposable paper diaper, a separation processing layer arranged on a base material is composed of a silicon type separation processing agent containing three-dimensionally formed organopolysiloxane by 10 to 40wt.%, and separating force to be defined next is set not more than 200g/25mm, and shearing adhesive strength is set not less than 1000g/25mm. Here, the separating force to be defined is 180 deg. separating) adhesive strength measured in 300mm/min by a tesilon type universal testing machine within 3 minutes after sticking fastener tapes F by a round trip of a 2 Kg roller onto the separation processing layer of respective specimens (a length 70mm X a width 50 mm) fixed on a stainless plate. The shearing adhesive strength is the one similarly measured by pulling them in the shearing direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a part of an adhesive tape for a disposable paper diaper, and the adhesive surface of the fastener tape is protected by peeling it so that the adhesive surface of the fastener tape is protected from the paper diaper manufacturing process to the time of use. It is an object to provide a release tape having a release treatment layer that can be applied.

[0002]

2. Description of the Related Art Although a generally used silicone release agent is used as a release treatment layer for a conventional release tape for disposable diapers, a shear adhesive strength with a fastener tape is reduced, and therefore a paper diaper is manufactured. The fastener tape peeled off in the line, and the adhesive surface of the fastener tape was contaminated before mounting or using the disposable diaper, resulting in a significant decrease in adhesiveness.

[0003]

On the other hand, when a long-chain alkyl-based release treatment agent is used as a release treatment agent, the above-mentioned drawbacks are solved, but the mother tries to remove the fastener tape when using a disposable diaper. At times, there is a problem that the peeling force is very high and peeling is difficult.

[0004]

In order to solve the above-mentioned problems, the present invention has examined the control of the peeling force of a silicone-based release treating agent, and as a result, a specific silicone-based release treating agent was used, and a further specific release agent was used. It was made to achieve the purpose by selecting the force and the shear adhesive force.

That is, according to the present invention, the release treatment layer provided on the substrate contains 10 to 4 three-dimensional organopolysiloxane.
For disposable paper diapers, which is composed of a silicone-based release treatment agent containing 0% by weight, and has a release force defined in the text of 200 g / 25 mm or less and a shear adhesive force of 1000 g / 25 mm or more. Provide release tape.

[0006]

The silicone-based release treating agent is said to exhibit releasability because the methyl group of the side chain of the helical structure of dimethylpolysiloxane faces the outside of the helix. However, the arrangement of the methyl groups is disturbed by mixing of the three-dimensional organopolysiloxane, and the original releasability is lost. The present invention is based on this idea, and the three-dimensional polyorganosiloxane is 10-40.
By using the silicone-based release treatment agent containing by weight, not only in the paper diaper production line, but also before use, it provides a shearing holding force to protect the adhesive surface of the fastener tape, and when the mother uses the paper diaper The peeling can be performed smoothly.

In the present invention, the silicone-based release treating agent constituting the release-treated layer is a usual silicone-based release treating agent containing 10 to 40% by weight of a three-dimensional organopolysiloxane. Here, as the usual silicone-based release treating agent, dimethylpolysiloxane is mainly used, and either an addition reaction type or a condensation reaction type can be used.

The three-dimensional organopolysiloxane contained in the above silicone release treatment agent has an average composition formula of [R ₃ SiO _0.5 ] _a [R ₂ SiO] _b [RSi
O _1.5 ] _c [SiO ₂ ] _d (In the formula, R represents a monovalent hydrocarbon group, a, b, c and d each represent a mole fraction of each siloxane unit, and a = 0.1 to
0.6, b = 0 to 0.45, c = 0 to 0.3, d = 0.3 to 0.8,
However, an organopolysiloxane represented by a / d = 0.3 to 2.0) can be preferably used.

The three-dimensional organopolysiloxane is in the range of 10 to 40% by weight, preferably 15 to 35.
It is compounded in the range of weight%. If it is less than 10% by weight, the necessary shear adhesive strength cannot be obtained, and if it exceeds 40% by weight, it becomes too heavy and peeling becomes difficult, which is not preferable.

In the present invention, the peeling force defined below is 200 g / 25 mm or less, preferably 30 to 180 g / 25 mm, and shearing is performed by blending a specific amount of the specific three-dimensional organopolysiloxane as described above. Adhesion strength is 1000
The object of the present invention can be achieved by designing to be g / 25 mm or more, preferably 2000 to 4000 g / 25 mm. If the peeling force exceeds 200g / 25mm, it may be difficult to remove the release tape smoothly during peeling. If the shear adhesive force is less than 1000g / 25mm, the release tape may come off from the fastener tape. Not preferable.

The peeling force defined here is a fastener tape (manufactured by Nitto Denko Corporation) with one reciprocation of a 2 kg roller on the peeling treatment layer of each sample piece (length 70 mm × width 50 mm) fixed on a stainless steel plate. Attach the product name Nitonup F-150K),
300 minutes with Tensilon universal tester within 3 minutes after pasting
The 180 ° peel adhesion measured in mm / min.

The shearing adhesive strength was determined by a fastener tape (25 mm) with a reciprocating 2 kg roller on the release treatment layer of each sample piece (length 70 mm × width 50 mm) fixed on a stainless steel plate.
× 25mm) (Nitto Denko Corporation, trade name Nitonap F-150K)
Is applied, and within 3 minutes after application, the shear adhesive strength is measured by pulling in the shear direction at 300 mm / min with a Tensilon universal testing machine.

In the release tape of the present invention, it is preferable that a silicone-based release treating agent containing a predetermined amount of the above-mentioned three-dimensional organopolysiloxane is coated on any base material without solvent. When it is high, it can also be obtained by adding a small amount of an organic solvent to reduce the viscosity, coating this on a substrate and then drying it. After that, ultraviolet irradiation or the like may be performed. The coating amount of the silicone-based release treating agent is usually 0.01 to 10 g / m ² ,
It is preferably 0.1 to 3 g / m ² .

The substrate on which the release treatment layer is provided is not particularly limited, and may be, for example, polypropylene-containing plastic described in JP-A-63-112704, a laminate of polypropylene and polypropylene-containing plastic, or polyester. Various plastic films, tapes, etc. are preferably used.

The substrate such as the film or tape is preferably subjected to surface treatment such as corona treatment in advance in order to prevent the release treatment agent applied to the surface thereof from falling off, and at least as an index of treatment strength. Surface tension 38dyne
/ cm ³ or more is preferable.

The pressure-sensitive adhesive layer of the fastener tape to which the release tape of the present invention is adhered is not particularly limited as long as it is an adhesive substance containing rubber as a main component, but in the present invention, it is particularly ABA type or AB type block copolymer (A is a thermoplastic block, B is a rubber block, for example, styrene-isoprene-styrene copolymer, styrene-butadiene-styrene copolymer, styrene-ethylene-butadiene-styrene copolymer, styrene -Butadiene copolymers or hydrogenated products thereof are preferred.

An application example using the release tape of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing each part of a diaper A, in which B is a back sheet,
C is the top sheet of the belt, D is the frontal tape,
E is a release tape of the present invention, and F is a fastener tape. FIG. 2 is an explanatory view showing a state in which a release portion is constituted by the release tape E and the fastener tape F of the present invention, and the silicone-based release treatment layer 2 is coated on the base material 1 of the present invention. The release tape E and the fastener tape F provided with the pressure sensitive adhesive layer 4 on the base material 3 are adhesively fixed at the interface between the layers 2 and 4 so as to be peelable.

[0018]

EXAMPLES The present invention will be described in detail below with reference to examples. In the text, "%" means% by weight, and "part" means part by weight. Examples 1 to 3 A three-dimensional organopolysiloxane (Shin-Etsu Chemical Co., Ltd.) was added to a toluene solution (solid content: 30%) of an addition reaction type silicone (X-62-2378 manufactured by Shin-Etsu Chemical Co., Ltd.) having a viscosity of 1500 cps at 25 ° C. X-92-140 manufactured by X-92-140) was mixed with a toluene / xylene solution (solid content: 30%) so that the three-dimensional organopolysiloxane was 15%, 25%, 35%. In addition, these solutions contain platinum 1000
ppm is vinyl siloxane (PL-50T manufactured by Shin-Etsu Chemical Co., Ltd.)
The silicone composition 100 as a complex with
To 2 parts as a 2 part catalyst was added. Then, 0.3 g / m ^{2 of} this solution was applied as a release treatment agent on a polyester film having a thickness of 12 μm, and then heat-treated at 120 ° C. for 1 minute to form a release treatment layer to obtain a release tape of the present invention.

Comparative Examples 1 to 2 The blending amount of the three-dimensional organopolysiloxane was 8% and 45
A release tape was obtained in the same manner as in the example except that the percentage was changed.

Using the release tape sample pieces (length 70 mm × width 50 mm) obtained in the examples and comparative examples, the peeling force and the shear adhesive force were measured under the following conditions, and the diaper processing test and the monitor test were performed. The results are shown in Table 1.

[0021] *: Three-dimensional dimethylpolysiloxane content

[Peeling force] A fastener tape (manufactured by Nitto Denko Corporation, trade name Nitonap F-150K) with one reciprocation of a 2 kg roller on the peeling treatment layer of each sample piece fixed on a stainless steel plate.
Was adhered, and the 180 ° peel adhesive strength was measured at 300 mm / min with a Tensilon type universal testing machine within 3 minutes after the application.

[Shearing Adhesion] A fastener tape (25 mm × 25 mm) (25 mm × 25 mm) with a 2 kg roller reciprocating on the release treatment layer of each sample piece fixed on a stainless plate (Nitto F-150K, manufactured by Nitto Denko Corporation) Was adhered, and within 3 minutes after the application, the shear adhesive force was measured by pulling in a shearing direction at 300 mm / min with a Tensilon universal testing machine.

[Paper Diaper Processing Test] Using the obtained release tape, a paper diaper was prepared by a paper diaper processing machine. The detachment of the fastener tape at that time was evaluated according to the following criteria. ○ No detachment in 100 sheets △ 1 to 10 in 100 sheets detached × 10 or more in 100 sheets detached

[Monitor Test] A paper diaper was prepared using the obtained release tape, and a monitor test was conducted for the ease of peeling the fastener tape. The results were evaluated as follows. ○ 8 out of 10 were considered good. Δ 5 to 7 out of 10 were considered good. × 4 or less out of 10 were considered good.

[0026]

EFFECTS OF THE INVENTION The release tape made of the specific release treatment agent of the present invention can protect and temporarily adhere the adhesive surface of the fastener tape from the manufacturing process of the diaper to the time of use, and can be smoothly released at the time of release. Have an effect.

[Brief description of drawings]

FIG. 1 is a schematic view showing an application example of a release tape of the present invention.

FIG. 2 is an explanatory view showing a state where a peeling portion is composed of a release tape E and a fastener tape F of the present invention.

[Explanation of symbols]

 E release tape F fastener tape 1 base material 2 release layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area C09J 7/02 JLJ

Claims (1)

[Claims] 1. A release treatment layer provided on a substrate is composed of a silicone release treatment agent containing 10 to 40% by weight of a three-dimensional organopolysiloxane, and has a release force as defined in the text. Of 200 g / 25 mm or less and a shear adhesive strength of 1000 g / 25 mm or more, release tape for disposable diapers