JP2009108502A - Joint finishing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint finishing material suppressing the discoloration of an external coating film and preventing the external coating film from being blistered without lowering adhering performance. <P>SOLUTION: This joint finishing material 10A comprises an adhering layer so adhered to wall members as to cover a joint between the wall members, a reinforcing layer formed of at least one layer and arranged outside the adhesive layer, and a cushioning section 16 which is interposed between the adhesive layer and the reinforcing layer and in which a cushioning material 15 is partially installed. The adhesive layer is a reactant of a copolymer obtained by copolymerizing a (meta) acrylic monomer and an isocyanate hardener, does not contain an adhesion grant agent. and has a ball initial adhesion value of 5-24 which is measured by the initial adhesion test method (inclination angle: 30°) according to JIS Z 0237. When the reinforcing layer comprises a plurality of layers, the cushioning section may be formed between any of the plurality of layers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seam treatment material attached to a seam between wall materials such as outer wall boards.

  In many cases, the wall surface of a building is constituted by a plurality of wall materials such as an outer wall board arranged in parallel, and an exterior coating film is provided on the outside by painting. In such a wall surface, an interval between adjacent wall materials changes due to a change in temperature or the like, and as a result, a crack may occur in the exterior coating film.

As a method for solving such a problem, for example, in Patent Document 1, an adhesive layer that is attached so as to cover a joint between wall materials, and a reinforcing layer that includes at least one layer provided outside the adhesive layer, A seam treatment material having a buffer portion formed between the adhesive layer and the reinforcing layer and partially provided with a buffer material is disclosed. By sticking this seam treatment material so as to cover the seam between the wall materials, even if a force that changes the interval between the wall materials acts, such a force is applied between the adhesive layer and the reinforcing layer. Since it is absorbed and relaxed by the buffer part, it hardly reaches the reinforcing layer. Therefore, if a seam treatment material as described in Patent Document 1 is used, cracks in the exterior coating film that occur when the interval between adjacent wall materials changes can be suppressed. Furthermore, since the buffer material is partially provided in the buffer portion, it is possible to suppress the portion of the exterior coating film corresponding to the joint from bulging outward over time.
JP 2006-233611 A

By the way, the tackifier included in the seam treatment material as described in Patent Document 1 usually contains a tackifier for the purpose of improving the sticking property.
However, the tackifier tends to bleed out to the surface of the exterior coating film over time, and the exterior coating film where the tackifier bleeds out is easily cured by ultraviolet rays. Such a phenomenon tends to cause discoloration of the exterior coating film, and has a problem in landscape.
Moreover, when the adhesion layer which does not contain a tackifier is used, the tack value becomes too low, the sticking property is lowered, and the wettability is lowered between the seam treatment material (adhesion layer) and the wall material. In some cases, an air layer was formed, which caused expansion and contraction over time, the air layer spread over the entire tackifier, and the exterior coating film swelled outward easily.

  This invention is made | formed in view of the said situation, and makes it a subject to implement | achieve the seam processing material which suppresses discoloration of an exterior coating film and prevents the swelling of an exterior coating film, without reducing sticking property.

  The first seam treatment material of the present invention includes an adhesive layer adhered so as to cover a seam between wall materials, a reinforcing layer composed of at least one layer provided outside the adhesive layer, the adhesive layer, and the reinforcement The adhesive layer is formed between the copolymer and a copolymer obtained by copolymerizing a (meth) acrylic monomer and an isocyanate-based curing. It is a reaction product with an agent, does not contain a tackifier, and has a ball tack value of 5 to 24 measured according to JIS Z 0237 tack test method (inclination angle 30 °). To do.

  In addition, the second seam treatment material of the present invention includes an adhesive layer that is adhered so as to cover the seam between the wall materials, a reinforcing layer that includes a plurality of layers provided outside the adhesive layer, and the plurality of layers. The adhesive layer is formed between any layers and has a buffer part provided with a buffer material. The adhesive layer is a copolymer obtained by copolymerizing a (meth) acrylic monomer, and an isocyanate-based curing. It is a reaction product with an agent, does not contain a tackifier, and has a ball tack value of 5 to 24 measured according to JIS Z 0237 tack test method (inclination angle 30 °). To do.

  Here, the (meth) acrylic monomer preferably contains 1 to 5% by mass of a monomer having a carboxyl group in 100% by mass of the (meth) acrylic monomer.

ADVANTAGE OF THE INVENTION According to this invention, the seam processing material which suppresses discoloration of an exterior coating film and prevents the swelling of an exterior coating film can be implement | achieved, without reducing adhesiveness.
Moreover, according to the joint processing material of this invention, the crack of an exterior coating film can be prevented.
Furthermore, since the seam treatment material of the present invention has an appropriate ball tack value even if it does not contain a tackifier, workability can be improved since the sticking property is good.

Hereinafter, the present invention will be described in detail.
The seam treatment material of the present invention has an adhesive layer, a reinforcing layer, and a buffer portion formed therebetween.
The seam-treated material of the present invention has a ball tack value of 5 to 24 measured according to the tack test method of JIS Z 0237 (inclination angle 30 °). When the ball tack value is lower than 5, the sticking property is liable to be lowered, and the wettability is lowered and an air layer is formed between the seam treatment material and the wall material when sticking to the seam between the wall materials. As a result, the air layer is expanded and contracted over time, and the exterior coating film tends to bulge outward. On the other hand, if the ball tack value is higher than 24, the seam treatment material that is usually wound up in a roll shape is peeled off, and the buffer part may be destroyed. Tends to decrease.

Here, the seam treatment material of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a plan view showing a seam treatment material 10A of the present embodiment, and FIG. 2 is a cross-sectional view showing a state where the seam treatment material 10A of FIG.
The seam treatment material 10 </ b> A in this example covers the seam C between the wall materials W, that is, the adhesive layer 11 that is stuck so as to straddle the adjacent wall materials W, and the reinforcement provided on the outside of the adhesive layer 11. It has a band-like shape having a width W ₁ of 5 cm and the layer 12.

The adhesive layer 11 is a reaction product of a copolymer obtained by copolymerizing a (meth) acrylic monomer and an isocyanate curing agent.
Further, the pressure-sensitive adhesive layer 11 used in the present invention does not contain a tackifier. According to the present invention, since the seam treatment material is prepared using an adhesive layer that does not contain a tackifier, there is no risk of the tackifier bleeding out on the surface of the exterior coating film, and the discoloration of the exterior coating film over time Can be suppressed.
In the present invention, “(meth) acrylate” refers to one or both of methacrylate and acrylate.

  The (meth) acrylic monomer is not particularly limited as long as it has a functional group capable of reacting with an isocyanate curing agent described later. For example, (meth) acrylic acid, 2-hydroxyethyl (meth) acrylate , Methyl (meth) acrylate, ethyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, benzyl (meth) acrylate, ethoxyethyl (meth) acrylate, butoxyethyl (Meth) acrylate, cyclohexyl (meth) acrylate, isoboronyl (meth) acrylate and the like can be mentioned. Among these, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, methyl (meth) acrylate, and (meth) acrylic acid are preferable. These (meth) acrylic monomers are preferably used in combination of two or more.

Moreover, as a (meth) acrylic-type monomer, it is preferable to use together the monomer which has a carboxyl group. Thereby, the adhesion layer with strong peeling strength can be comprised.
(Meth) acrylic acid is mentioned as a monomer containing a carboxyl group. 1-100 mass% is preferable in 100 mass% of (meth) acrylic-type monomers, and, as for content of the monomer containing a carboxyl group, 2-3 mass% is more preferable. If the lower limit of the content is smaller than the above value, the reaction between the copolymer and the isocyanate curing agent described later may not proceed smoothly. On the other hand, if the upper limit value of the content is larger than the above value, it becomes hard and tack is lowered.

  The method for copolymerizing the (meth) acrylic monomer is not particularly limited, and known methods such as radical polymerization such as solution polymerization, suspension polymerization, and emulsion polymerization can be used. Among these, solution polymerization is preferable, and a copolymer is obtained by allowing the polymerization to proceed at a polymerization temperature of 60 ° C. or higher and a boiling point of the (meth) acrylic monomer or lower in the presence of a polymerization initiator.

Since the seam treatment material of the present invention does not contain a tackifier in the pressure-sensitive adhesive layer as described above, there is no risk that the tackifier will bleed out on the surface of the exterior paint film, and the discoloration of the exterior paint film over time Can be suppressed. Further, even when an adhesive layer that does not contain a tackifier is used, since the ball tack value of the seam treatment material is 5 to 24, the sticking property is good and the wettability is excellent. It becomes difficult to form an air layer between the wall materials, and swelling of the exterior coating film can be prevented.
In order to set the ball tack value within the above range, for example, the glass transition temperature of a copolymer obtained by copolymerizing a (meth) acrylic monomer may be −40 to −70 ° C. The glass transition temperature of the copolymer is preferably -50 to -65 ° C.
In addition, the glass transition temperature of a copolymer can be adjusted with the kind of (meth) acrylic-type monomer, and its compounding quantity. Moreover, the glass transition temperature of a copolymer can be calculated | required from the formula of FOX shown to following formula (1).
1 / Tg = Σ (Wi / Tgi) (1)
In the formula (1), Wi is a mass fraction of each (meth) acrylic monomer i constituting the copolymer, and Tgi is a homopolymer glass of each (meth) acrylic monomer i. It is a transition temperature, and Tg and Tgi are values expressed in absolute temperature (K). Tgi is widely known as a characteristic value of each homopolymer. For example, a value described in “POLYMER HANDBOOK, THIRD EDITION” may be used.

  Moreover, it is preferable that the molecular weight of the said copolymer will be 400,000-1 million, and 500,000-800000 are more preferable. When the molecular weight of the copolymer is less than 400,000, the cohesive force is reduced, and deviation may occur after sticking. On the other hand, when the molecular weight of the copolymer exceeds 1,000,000, the viscosity becomes high and gelation tends to occur and coating becomes difficult.

  The isocyanate curing agent that reacts with the copolymer is a polyisocyanate compound having a plurality of isocyanate groups, and specifically, aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI) and biuret, and toluene diisocyanate (TDI). ) And aromatic polyisocyanates such as xylene diisocyanate (XDI). Of these, toluene diisocyanate (TDI) is preferably used.

In the reaction of the copolymer and the isocyanate curing agent, 0.3 to 3.0 parts by mass (in terms of solid content) of the isocyanate curing agent is used with respect to 100 parts by mass of the copolymer, and 50 to 100. What is necessary is just to make it react at ° C. Thus, an adhesive layer is formed by the reaction product obtained by reacting the copolymer and the isocyanate curing agent.
The thickness of the adhesive layer 11 shown in FIGS. 1 and 2 is preferably about 10 to 50 μm.

On the other hand, the reinforcing layer 12 is formed of rubber 13 in which a nonwoven fabric 14 is disposed inside in this example. Examples of the rubber 13 include acrylic rubber, polychloroprene rubber, and polyurethane rubber. The nonwoven fabric 14 is made of nylon, polyester, rayon, polyacrylic ester, polypropylene, vinylon, polyethylene, polyurethane, cupra, or the like. The reinforcing layer 12 in this example is formed to a thickness of about 100 to 200 μm, and the nonwoven fabric 14 has a mass per unit area of 10 to ²⁰ g / m ² .

And between the adhesion layer 11 and the reinforcement layer 12, the buffer part 16 in which the buffer material 15 was partially provided is formed, and the buffer part 16 is the part in which the buffer material 15 exists, and other than that It consists of parts. In this example, a square cushioning material 15 made of silicone resin and having a thickness of about 2 to 8 μm and a side length X of 2 mm is regularly provided in a staggered manner with a span S of 1 mm. The buffer part 16 is formed.
Further, the buffer section 16 of this example, the center in the width direction of the seam processing member 10A, is provided in the width W ₂ than the seam C. Then, both end portions in the width direction of the seam processing member 10A has a cushioning material absence portion 17 having a width W ₃ of the buffer material 15 is not present at all. In this example, the width _{W 2} 3 cm, a width _{W 3} is a 1 cm.

  When such a seam treatment material 10A is adhered along the seam C of the wall material W as shown in FIG. 2, when a force that widens the interval between the wall materials W is applied, the seam treatment material 10A is in direct contact with the wall material W. The pressure-sensitive adhesive layer 11 extends following the spread. However, since the adhesive layer 11 and the reinforcing layer 12 are not fixed to each other in the portion where the buffer material 15 is provided, the force that widens the interval between the wall materials W is absorbed and relaxed by the buffer material 15, The reinforcing layer 12 is hardly reached. Therefore, even when such a force is applied, the exterior coating film (not shown) formed by painting on the outside of the reinforcing layer 12 does not crack.

Further, when the buffer material 15 is partially provided in this manner in the buffer portion 16, not only can the crack of the exterior coating film be prevented, but also the exterior coating film corresponding to the joint C swells outward over time. It can also be suppressed. Although the reason why such a swelling suppressing effect is manifested is not clear, it is considered that some action that induces swelling is alleviated in a portion of the cushioning portion 16 where the cushioning material 15 does not exist. Such a swelling suppression effect is more effectively exhibited when the area ratio of the portion provided with the buffer material 15 in the buffer portion 16 having a length of 1 m is 20 to 90%.
In addition, you may use an adhesive agent for the adhesion of 10 A of seam treatment materials as needed. Further, a base treatment or undercoating may be applied to the target portion of the wall material W before sticking.

In addition, as in the example of FIG. 1, when the square cushioning material 15 having a certain size is scattered in a staggered manner with a certain span S, the length X of one side of the cushioning material 15 is 2 to 2. When the span S is 1 to 4 mm at 6 mm, both the crack suppression effect and the swelling suppression effect of the exterior coating film are very excellent. Further, as shown in FIG. 3, the cushioning material 15 may be provided in a pattern in which circular cushioning materials 15 having a certain size are scattered in a staggered pattern. D is at 2 to 6 mm, span shown in the figure _{S 1} 2 to 9 mm, the spans indicated by _{S 2} is a 2 to 6 mm, and suppression blister and crack inhibition effect of the outer coating are both very excellent. Further, as long as the cushioning material 15 is partially provided in the cushioning portion 16, the shape, size, span, and the like are not limited, and the arrangement pattern thereof is a regular pattern such as a staggered pattern as well as a regular pattern. It may be a pattern with no sex. Further, the shape and size of each cushioning material 15 may be different.
Further, as shown in FIGS. 4 and 5, the portion of the buffer portion 16 where the buffer material 15 is provided and the portion where the buffer material 15 is not provided are patterns reversed from those in FIGS. 1 and 3. Alternatively, as shown in FIG. 6, the buffer material 15 may be provided intermittently in the buffer portion 16.

  The buffer material 15 can be provided by gravure printing. That is, using a transfer roll in which recesses corresponding to the arrangement pattern of the buffer material 15 are formed, the raw material liquid of the buffer material 15 is poured into the recesses of this transfer roll, and the excess raw material liquid is removed with a spatula or the like. It may be transferred to the surface of the layer 11 or the reinforcing layer 12.

In the above example, the cushioning material non-existing portions 17 are formed at both ends, but they are not necessarily formed.
Moreover, although the reinforcement layer 12 of this example is formed from the rubber | gum 13 by which the nonwoven fabric 14 is arrange | positioned inside, the reinforcement layer does not need to have a nonwoven fabric and may be two or more layers.
Furthermore, the widths W ₁ , W ₂ , W _3, etc. of each part can be set as appropriate according to the width of the joint C, the structure of the joint C, and the like. Moreover, you may provide a release paper suitably in the exposed surface of the adhesion layer 11. FIG.

FIG. 7 exemplifies still another embodiment. The seam treatment material 10 </ b> F includes a first reinforcing layer in which the reinforcing layer 12 has a two-layer structure and the nonwoven fabric 14 is arranged inside the rubber 13. 12a is not only provided, but also a second reinforcing layer 12b made of rubber is provided inside thereof, and not only between the adhesive layer 11 and the reinforcing layer 12, but also between the first reinforcing layer 12a and 1 is different from the seam treatment material 10A of FIG. 1 in that a buffer portion 16 is provided between the second reinforcing layer 12b.
The first reinforcing layer 12a preferably has a thickness of about 100 to 200 μm, and the second reinforcing layer 12b has a thickness of about 20 to 50 μm.

  In such a seam treatment material 10F, the first reinforcement layer 12a and the second reinforcement layer 12b are not fixed to each other in the portion where the cushioning material 15 is provided. Therefore, when this seam treatment material 10F is adhered to the seam of the wall material, when a force that widens the interval between the wall materials acts, such a force is applied to the adhesive layer 11 and the second reinforcing layer 12b in the same manner. Although acting, it is absorbed by the buffer material 15 and hardly reaches the first reinforcing layer 12a. Therefore, even when the exterior coating film is formed on the outside and a force that increases the interval between the wall materials acts, the exterior coating film on the outside of the reinforcing layer 12 is hardly cracked. Furthermore, even in the case of this example, since the buffer material 15 is partially present, it is possible to prevent the exterior coating film from swelling with time, as well as cracking of the exterior coating film.

As described above, since the seam treatment material of the present invention does not contain a tackifier in the adhesive layer, discoloration of the exterior coating film over time can be suppressed. In addition, even if it does not contain a tackifier, the ball tack value can be maintained at an appropriate value, so the sticking property is good and the wettability is excellent, and an air layer is formed between the seam treatment material and the wall material. This makes it difficult to swell the outer coating film. Therefore, if such a seam treatment material is used, workability can be improved.
Further, according to the seam treatment material of the present invention, even if a force that changes the interval of the wall material acts, such a force is applied between the adhesive layer and the reinforcing layer or a plurality of layers constituting the reinforcing layer. Therefore, even if the interval between adjacent wall materials changes, cracking of the exterior coating film can be suppressed. Furthermore, since the buffer material is partially provided in the buffer portion, it is possible to suppress the portion of the exterior coating film corresponding to the joint from bulging outward over time.

EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these.
[Example 1]
<Preparation of reaction product for forming adhesive layer>
As a (meth) acrylic monomer, a mixture of 67.5% by mass of n-butyl acrylate (BA), 30.0% by mass of 2-ethylhexyl acrylate (2-EHA), and 2.5% by mass of acrylic acid (AA) A monomer mixed solution was prepared by dissolving 0.1 part by mass of azobisisobutyronitrile as a polymerization initiator in 100 parts by mass. 30% by mass of the monomer mixture was dissolved in 70% by mass of ethyl acetate, and initial polymerization was performed with stirring at the boiling point of ethyl acetate for 2 hours. Subsequently, the remaining 70% by mass of the monomer mixture was subjected to drop polymerization over 3 hours while maintaining the boiling point temperature. Furthermore, 0.1 part by mass of azobisisobutyronitrile was added and polymerization was performed for 5 hours (total polymerization time: 10 hours). Thereafter, 80 parts by mass of ethyl acetate was added while cooling to obtain a copolymer. The glass transition temperature of the copolymer calculated from the above formula (1) was −57 ° C.
To 100 parts by mass of the obtained copolymer, 1.2 parts by mass (in terms of solid content) of toluene diisocyanate (manufactured by Nippon Polyurethane Industry Co., Ltd., “Coronate L”) is added as an isocyanate curing agent, and dried at 80 ° C. for 30 minutes. And allowed to stand at room temperature for 3 days to obtain a reaction product.

<Manufacture of seam treatment material>
The width W ₁ of the configuration shown in FIGS. 1 and 7 to produce a 5cm seam processing material was wound into a roll.
The adhesive layer was formed from the reaction product obtained previously, and the thickness was 20 μm. The reinforcing layer was a non-woven fabric made of polypropylene (12 g / m ² ) disposed inside the acrylic rubber and had a two-layer structure with a thickness of 150 μm.
Between the first reinforcing layer 12a and the second reinforcing layer 12b, provided such a buffer portion width W ₂ becomes 3 cm, on either side of the buffer section width W ₃ of the buffer material absence portion 1cm It was provided so that. Moreover, the buffer part was formed by providing the buffer material which consists of squares partially. The buffer material was provided in a staggered manner on the surface of the reinforcing layer by gravure printing of a silicone resin (“SRX-370” manufactured by Toray Dow Corning Silicone Co., Ltd.). In addition, the thickness ratio of the buffer material was 5 μm, the length X of one side was 2 mm, the span S was 2 mm, and the area ratio of the buffer member provided in the buffer part having a length of 1 m was 36%.
The obtained seam treatment material was subjected to the following measurements and various evaluations. The results are shown in Table 1.

<Measurement / Evaluation>
(Measurement of ball tack value)
According to the tack test method of JIS Z 0237, the ball tack value of the seam-treated material was measured at an inclination angle of 30 ° using an inclined ball tack apparatus (“Ball Tack Tester” manufactured by Tester Sangyo Co., Ltd.).

(Evaluation of blistering of exterior coating film: temperature / cool cycle test)
Two slate plates were arranged, and the seam treatment material obtained in each example was adhered to the joint so that the adhesive layer side was in contact with the slate plate. Thereafter, an acrylic resin paint was applied to the outside of the seam treatment material to form an outer coating film having a thickness of 500 μm, and the test piece was left for 14 days.
The obtained test piece was held at −5 ° C. for 4 hours and then held at 65 ° C. for 4 hours as one cycle, for a total of 40 cycles.
Then, the presence or absence of the swelling of the part corresponding to the joint in an exterior coating film was evaluated visually.
Table 1 shows the case where no blistering was observed by visual observation, and the case where it was recognized as x.

(Evaluation of discoloration of exterior coating film)
A test piece was produced in the same manner as the evaluation of the blistering of the exterior coating film, and this test piece was allowed to stand at 80 ° C. for 200 hours.
Table 1 shows the case where no discoloration was visually observed as ◯ and the case where the discoloration was observed as x.

(Evaluation of workability)
The state of the buffer portion when the seam treatment material wound in a roll shape was peeled by 1 m at room temperature was visually evaluated.
Table 1 shows the case where no abnormality was observed in the buffer portion of the seam treatment material by visual observation, and the case where breakage was found in a part of the buffer portion of the seam treatment agent as x.

[Examples 2 and 3]
As shown in Table 1, a copolymer and a reaction product were prepared in the same manner as in Example 1 except that the kind of (meth) acrylic monomer and the blending amount thereof were changed, and a seam treatment material was produced. Various measurements and evaluations were performed. The results are shown in Table 1.

[Comparative Examples 1 and 2]
As shown in Table 1, a copolymer was prepared in the same manner as in Example 1 except that the kind of (meth) acrylic monomer and the blending amount thereof were changed.
To 100 parts by mass of the obtained copolymer, 1.2 parts by mass of toluene diisocyanate (in terms of solid content) as an isocyanate curing agent, and a rosin resin (Arakawa Chemical Industries, “Superester A-100” as a tackifier) ] 20.0 parts by mass was added, dried at 80 ° C. for 30 minutes, and then allowed to stand at room temperature for 3 days to obtain a reaction product.
A seam-treated material was produced in the same manner as in Example 1 except that the reactant thus obtained was used, and various measurements and evaluations were performed. The results are shown in Table 1.

[Comparative Examples 3 and 4]
As shown in Table 1, a copolymer and a reaction product were prepared in the same manner as in Example 1 except that the kind of (meth) acrylic monomer and the blending amount thereof were changed, and a seam treatment material was produced. Various measurements and evaluations were performed. The results are shown in Table 1.

The abbreviations in Table 1 indicate the following compounds.
“BA”: n-butyl acrylate,
“2-EHA”: 2-ethylhexyl acrylate,
“MMA”: methyl methacrylate,
“AA”: acrylic acid,

As can be seen from Table 1, the use of the seam treatment material obtained in the examples did not show any blistering of the exterior coating film in the heating / cooling cycle test. Moreover, workability | operativity was favorable and the inhibitory effect of exterior coating-film discoloration was able to be expressed. Such a seam treatment material had good adhesion.
On the other hand, since the seam treatment material obtained in Comparative Examples 1 and 2 contained a tackifier in the adhesive layer, the sticking property was good, but the tackifier surfaced over the surface of the exterior coating film over time. Bleed out to discolor the exterior coating.
Since the seam treatment material (comparative example 3) having a ball tack value of 4 did not contain a tackifier in the adhesive layer, discoloration of the exterior coating film could be suppressed, but the seam treatment material and the wall material ( Due to the air layer formed between the straight plates), the outer coating film was swollen.
Since the seam treatment material (Comparative Example 4) having a ball tack value of 25 did not contain a tackifier in the adhesive layer, discoloration of the exterior coating film could be suppressed, but the buffer portion was brittle and the wall material. It was necessary to be cautious when sticking to the tape, and workability was reduced.

It is a top view which shows an example of the seam processing material of this invention. It is sectional drawing which shows the state which stuck the seam treatment material of FIG. 1 to the seam between wall materials. It is a top view which shows another example of the seam processing material of this invention. It is a top view which shows another example of the seam processing material of this invention. It is a top view which shows another example of the seam processing material of this invention. It is a top view which shows another example of the seam processing material of this invention. It is sectional drawing which shows another example of the seam processing material of this invention.

Explanation of symbols

  W: wall material, C: seam, 10A to 10F: seam treatment material, 11: adhesive layer, 12: reinforcing layer, 12a: first reinforcing layer, 12b: second reinforcing layer, 15: cushioning material, 16: Buffer part

Claims (3)

An adhesive layer adhered to cover the seam between the wall materials, a reinforcing layer composed of at least one layer provided outside the adhesive layer, and formed between the adhesive layer and the reinforcing layer, and a cushioning material A buffer part provided partially,
The adhesive layer is a reaction product of a copolymer obtained by copolymerizing a (meth) acrylic monomer and an isocyanate curing agent, and does not contain a tackifier.
A seam-treated material having a ball tack value of 5 to 24 measured according to a tack test method of JIS Z 0237 (inclination angle 30 °). An adhesive layer adhered to cover a seam between wall materials, a reinforcing layer composed of a plurality of layers provided outside the adhesive layer, and a cushioning material partially formed between any of the plurality of layers And a buffer portion provided in
The adhesive layer is a reaction product of a copolymer obtained by copolymerizing a (meth) acrylic monomer and an isocyanate curing agent, and does not contain a tackifier.
A seam-treated material having a ball tack value of 5 to 24 measured according to a tack test method of JIS Z 0237 (inclination angle 30 °).   The said (meth) acrylic-type monomer contains the monomer which has a carboxyl group 1-5 mass% in the said (meth) acrylic-type monomer 100 mass%, The Claim 1 or 2 characterized by the above-mentioned. The seam treatment material described.

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