JP3827624B2 - Self-adhesive sheet and method for producing the same - Google Patents

Self-adhesive sheet and method for producing the same Download PDF

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Publication number
JP3827624B2
JP3827624B2 JP2002220851A JP2002220851A JP3827624B2 JP 3827624 B2 JP3827624 B2 JP 3827624B2 JP 2002220851 A JP2002220851 A JP 2002220851A JP 2002220851 A JP2002220851 A JP 2002220851A JP 3827624 B2 JP3827624 B2 JP 3827624B2
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weight
parts
self
adhesive sheet
sheet
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JP2004059762A (en
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宏朗 榛沢
陽介 鈴木
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Denka Co Ltd
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Denki Kagaku Kogyo KK
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Description

【0001】
【発明の属する技術分野】
本発明は、空調機用配管、ガス管、水道管等の管の外周に巻き付けられて管を保護する自己粘着性シートに係り、特に不用意に巻き戻されないと共に巻き付け作業のし易い自己粘着性シートに関する。
【0002】
【従来の技術】
自己粘着性シートとして、本出願人は、特開2001−3008号公報で、アニールの設定温度で粘着力を0.294〜0.589N/10mm(30〜60gf/10mm)に設定できるものを開示した。
【0003】
【発明が解決しようとする課題】
しかしながら、上記公報の手段による自己粘着性シートは、テープの引剥力(巻戻力、JIS Z 0237に準拠)が2.5N/10mm程度と強すぎてしまった。管材保護用の自己粘着性シートとして求められる巻戻力は、1.0〜1.5N/10mmがよいとされている。
【0004】
本発明の目的は、上記従来品の欠点を解消すべく発明された自己粘着性シートを提供するものである。
【0005】
本発明は、上記に鑑み発明されたものであって、塩化ビニル系重合体100重量部、可塑剤5〜80重量部、粘着付与剤3〜20重量部及び改質剤1〜10重量部を混合した組成物をシート状に形成し、以下の(1)〜(3)を具備する自己粘着性シートである。
(1)粘着付与剤の軟化点より4℃低い温度〜該軟化点より15℃低い温度の範囲に設定された温度でアニールをする。
(2)シート表面に中心線平均粗さRa1.0〜1.8μmのシボを設ける。
(3)巻戻力が1.0〜1.5N/10mmである。
【0006】
ここで、前記シボは、自己粘着性シートの巻戻力を弱めるために設けられたものであり、これにより、シボのない自己粘着性シートの巻戻力より低い値の巻戻力を得ることができる。このシボを設ける手段としては、シート形成時のカレンダ工程時にその表面に細かい凹凸のあるエンボスロールを設ける手段がある。
【0007】
このシボとしては、好ましくは、前記シート表面が表面粗さ(中心線平均粗さ)Ra1.0〜1.8μmであることが好ましい。この表面粗さの値を特定したのは、あまりに小さいと、シボを設けた意味がなく、あまりに大きいと巻戻力が小さくなりすぎるためである。巻戻力があまりに小さくなると、テープ状にして巻き戻す際に、不用意に巻き戻されてしまい、作業し難くなるためである。
【0008】
本発明における塩化ビニル系重合体は、ポリ塩化ビニルの他、塩化ビニル−酢酸ビニル共重合体、塩化ビニル−エチレン共重合体、塩化ビニル−プロピレン共重合体、塩素化ポリエチレン等や、これらの混合物を含むものを使用できる。ここで、塩化ビニル系重合体の重合度は700〜3000のものを使用できるが、加工性の問題から1700〜3000の高重合度の重合体がよく、この場合、低重合度(700〜1700)の場合に比べて初期弾性率が高く、風合いのよいシートを得ることができる。また、700〜1700の低重合度の場合、改質剤を配合すれば加工性を改善できる。なお、改質剤は1〜10重量部配合するのが好ましく、具体的にはMBS、EVA、塩素化ポリエチレン等があり、高重合度の場合に配合してもよいのは勿論である。
【0009】
本発明における可塑剤としては、エステル系可塑剤、ポリエステル系可塑剤等を使用でき、好ましくはエステル系高分子量可塑剤である。可塑剤の具体的な例としては、フタル酸ジヘプチル(DHP)、フタル酸ジ−2−エチルヘキシル(DOP)、フタル酸ジ−n−オクチル(n−DOP)、フタル酸ジイソデシル(DIDP)、ベンジルブチルフタレート(BBP)、トリメリット酸トリ−2−エチルヘキシル(TOTM)、アジピン酸ジ−2−エチルヘキシル(DOA)、トリクレジルフォスフェート(TCP)、ベンジルオクチルアジペート(BOA)、ジフェニルクレジルフォスフェート(DPCP)若しくはアジピン酸ジイソデシル等がある。なお、これらの混合物を使用でき、可塑剤によって粘着力が異なるのは勿論である。
【0010】
ここで、上記可塑剤が5〜80重量部の範囲内で配合されるのは、5重量部未満であると可塑剤としての効果が発現せず80重量部より多くなると組成物自体の弾性力や引張強度が低下してしまうためである。
【0011】
また、本発明における粘着付与剤としては、ロジン系樹脂、テルペン系樹脂、脂肪族系石油樹脂、芳香族系石油樹脂、脂環族系石油樹脂、クロマン樹脂、スチレン系樹脂、アルキルフェノール樹脂、キシレン樹脂等を使用できるが、好ましくはテルペン系樹脂や脂肪族系石油樹脂がよく、試験した結果、これらの樹脂に限って高い粘着力を得ることができた。具体的な例としては、テルペン樹脂であるYSレジンPX−1000(安原油脂社製)、脂肪族系石油樹脂であるエスコレッツ(エッソ化学社製)がよい。なお、水添ロジン、水添ロジンエステル、さらには脂肪族系石油樹脂等の樹脂でも水添系の樹脂は、加工性が高いが粘着力が高くならないため高い粘着力を必要とする場合には粘着付与剤としては好ましくない。
【0012】
ここで、上記粘着付与剤が3〜20重量部の範囲内で配合されるのは、3重量部未満であると高い粘着力が発現せず20重量部より多くなると粘着力が高くなりすぎて剥離粘着力をも高くなってしまうためである。
【0013】
なお、本発明の自己粘着シートに難燃剤を配合した場合には、その基材の難燃性が減殺されることなく粘着力を有するのは勿論のことである。
【0014】
本発明に係る自己粘着性シートは、次の工程で製造される。すなわち、他の発明としての自己粘着性シートの製造方法は、塩化ビニル系重合体100重量部、可塑剤5〜80重量部、粘着付与剤3〜20重量部及び改質剤1〜10重量部を混合し、この混合した組成物をシート状に形成し、さらにこのシートに対して前記粘着付与剤の軟化点より4℃低い温度〜該軟化点より15℃低い温度の範囲に設定された温度でアニールをすることを特徴とするものである。
【0015】
この発明において、アニールの温度を前記粘着付与剤の軟化点より4℃低い温度〜該軟化点より15℃低い温度の範囲に設定したのは、アニールの設定温度によって巻戻力を低く調整できることを見出したためである。
【0016】
【実施例】
以下、本発明の実施例について詳細に説明する。
【0017】
表1に本発明にかかる自己粘着性シートの各実施例と各比較例を示す。表1における中心線平均粗さRa(単位:μm)は、JIS B 0601、JIS B 0633に準拠して測定したものであり、巻戻力は、このアニールを行った自己粘着性シートをJIS Z 0237に準拠して測定した値であり、300mm/分の速度で引き剥がして測定した。表1の作業性は、テープの自重で巻ほぐれるか、または、巻きが重すぎる場合を×、テープの自重で巻きほぐれないが引き剥がしが軽い、または、巻きが若干重い場合を△、テープの自重で巻きほぐれなく、引き剥がし及び巻きが適度である場合を○にした。
【0018】
【表1】

Figure 0003827624
【0019】
ここで、表1の実施例1の自己粘着性シートは、重合度1300のポリ塩化ビニル樹脂(大洋塩ビ社製)100重量部、可塑剤としてのDOP(ジェイプラス社製)55重量部、粘着付与剤としてのC59石油樹脂(エッソ化学社製、軟化点94℃)10重量部、改質剤としてのMBS(日本合成ゴム社製)2重量部、安定剤としてのCa−Zn系安定剤(水澤化学社製)2重量部、滑剤としてのSt酸(日本油脂社製)0.2重量部、さらにMMA(鐘淵化学工業社製)2重量部が配合されている。
【0020】
本実施例1は、上記配合物を混合し、カレンダ工程により厚さ150μmのフィルムに成形する。このフィルムを巻芯に巻き取った後、90℃(上記粘着付与剤の軟化点より4℃低い温度)の環境下で8時間放置するアニールを行った。なお、この時のカレンダ工程で、エンボスロールにて表1に示す中心線平均粗さ(単位:μm)を与えている。
【0021】
本実施例1にあっては、要求される巻戻力を得ることができた。そのため、不用意に巻き戻されないと共に巻き付け作業のし易い自己粘着性シートを得ることができた。
【0022】
比較例1、2及び実施例2、3は、実施例1の製造方法において、カレンダ工程時のエンボスロールを変えて中心線平均粗さRaの値を変えたものである。Raが1.0〜1.8の範囲なら巻戻力が要望される範囲内であり作業性も良好であるが、この範囲を外れると作業性が悪かった。
【0023】
比較例3、4及び実施例4は、実施例1の製造方法において、アニールの温度を変えたものである。アニールの設定温度が前記粘着付与剤の軟化点から該軟化点より15℃低い温度の範囲に設定されていると、巻戻力が要望される範囲内であり、作業性も良好であるが、この範囲を外れると作業性が悪かった。
【0024】
【発明の効果】
本発明にあっては、塩化ビニル系重合体100重量部、可塑剤5〜80重量部、粘着付与剤3〜20重量部及び改質剤1〜10重量部を混合した組成物をシート状に形成し、以下の(1)〜(3)を具備する自己粘着性シートである。
(1)粘着付与剤の軟化点より4℃低い温度〜該軟化点より15℃低い温度の範囲に設定された温度でアニールをする。
(2)シート表面に中心線平均粗さRa1.0〜1.8μmのシボを設ける。
(3)巻戻力が1.0〜1.5N/10mmである。
これにより不用意に巻き戻されないと共に巻き付け作業のし易い自己粘着性シートを提供することができた。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-adhesive sheet that is wound around the outer periphery of a pipe such as a pipe for an air conditioner, a gas pipe, a water pipe, etc., and protects the pipe . about the seat.
[0002]
[Prior art]
As a self-adhesive sheet, the present applicant discloses in Japanese Patent Application Laid-Open No. 2001-3008 that the adhesive force can be set to 0.294 to 0.589 N / 10 mm (30 to 60 gf / 10 mm) at a set temperature of annealing. did.
[0003]
[Problems to be solved by the invention]
However, the self-adhesive sheet by the means of the above publication has a tape peeling force (rewinding force, based on JIS Z 0237) of about 2.5 N / 10 mm, which is too strong. The unwinding force required as a self-adhesive sheet for protecting a pipe material is said to be 1.0 to 1.5 N / 10 mm.
[0004]
The object of the present invention is to provide a self-adhesive sheet that has been invented in order to eliminate the drawbacks of the conventional products.
[0005]
The present invention has been invented in view of the above, and comprises 100 parts by weight of a vinyl chloride polymer, 5 to 80 parts by weight of a plasticizer, 3 to 20 parts by weight of a tackifier, and 1 to 10 parts by weight of a modifier. It is a self-adhesive sheet comprising the mixed composition formed into a sheet and comprising the following (1) to (3).
(1) Annealing is performed at a temperature set in a range of 4 ° C. lower than the softening point of the tackifier to 15 ° C. lower than the softening point.
(2) A texture having a center line average roughness Ra of 1.0 to 1.8 μm is provided on the surface of the sheet.
(3) The unwinding force is 1.0 to 1.5 N / 10 mm.
[0006]
Here, the wrinkles are provided to weaken the rewinding force of the self-adhesive sheet, thereby obtaining a rewinding force with a value lower than the rewinding force of the self-adhesive sheet without wrinkles. Can do. As a means for providing this embossing, there is a means for providing an embossing roll having fine irregularities on its surface during a calendar process during sheet formation.
[0007]
As the texture, the sheet surface preferably has a surface roughness (centerline average roughness) Ra of 1.0 to 1.8 μm. The value of this surface roughness is specified because it is meaningless to provide a texture if it is too small, and the rewinding force is too small if it is too large. This is because if the unwinding force is too small, the tape will be unintentionally unwound when it is rewound, making it difficult to work.
[0008]
The vinyl chloride polymer in the present invention includes polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, chlorinated polyethylene and the like, and mixtures thereof. Can be used. Here, although the degree of polymerization of the vinyl chloride polymer can be 700 to 3000, a polymer having a high degree of polymerization of 1700 to 3000 is preferable from the viewpoint of processability, and in this case, a low degree of polymerization (700 to 1700). ), A sheet having a high initial elastic modulus and a good texture can be obtained. In the case of a low degree of polymerization of 700 to 1700, the workability can be improved by adding a modifier. In addition, it is preferable to mix | blend 1-10 weight part of modifiers, Specifically, there exist MBS, EVA, chlorinated polyethylene, etc. Of course, you may mix | blend in the case of high polymerization degree.
[0009]
As the plasticizer in the present invention, an ester plasticizer, a polyester plasticizer, or the like can be used, and an ester high molecular weight plasticizer is preferable. Specific examples of plasticizers include diheptyl phthalate (DHP), di-2-ethylhexyl phthalate (DOP), di-n-octyl phthalate (n-DOP), diisodecyl phthalate (DIDP), benzylbutyl Phthalate (BBP), trimellitic acid tri-2-ethylhexyl (TOTM), di-2-ethylhexyl adipate (DOA), tricresyl phosphate (TCP), benzyloctyl adipate (BOA), diphenyl cresyl phosphate ( DPCP) or diisodecyl adipate. Of course, a mixture of these can be used, and the adhesive strength varies depending on the plasticizer.
[0010]
Here, the plasticizer is blended in the range of 5 to 80 parts by weight. If the amount is less than 5 parts by weight, the effect as a plasticizer is not exhibited. This is because the tensile strength decreases.
[0011]
The tackifier in the present invention includes rosin resin, terpene resin, aliphatic petroleum resin, aromatic petroleum resin, alicyclic petroleum resin, chroman resin, styrene resin, alkylphenol resin, xylene resin. However, terpene resins and aliphatic petroleum resins are preferred, and as a result of testing, high adhesive strength was obtained only for these resins. As specific examples, YS resin PX-1000 (manufactured by Anru Crude Oil Co., Ltd.) which is a terpene resin and Escorez (manufactured by Esso Chemical Co., Ltd.) which is an aliphatic petroleum resin are preferable. Note that hydrogenated rosin, hydrogenated rosin ester, and even aliphatic petroleum resins such as hydrogenated resins have high processability but do not have high adhesive strength. It is not preferred as a tackifier.
[0012]
Here, the tackifier is blended in the range of 3 to 20 parts by weight. If the amount is less than 3 parts by weight, a high adhesive force is not expressed and if it exceeds 20 parts by weight, the adhesive force becomes too high. This is because the peel adhesive strength is also increased.
[0013]
In addition, when a flame retardant is mix | blended with the self-adhesive sheet of this invention, of course, it has adhesive force, without the flame retardance of the base material being attenuated.
[0014]
The self-adhesive sheet according to the present invention is manufactured by the following steps. That is, the method for producing a self-adhesive sheet as another invention includes 100 parts by weight of a vinyl chloride polymer, 5 to 80 parts by weight of a plasticizer, 3 to 20 parts by weight of a tackifier, and 1 to 10 parts by weight of a modifier. The mixed composition is formed into a sheet shape, and the temperature set in the range of 4 ° C. lower than the softening point of the tackifier to 15 ° C. lower than the softening point with respect to the sheet. It is characterized by annealing.
[0015]
In this invention, the annealing temperature is set in the range of 4 ° C. lower than the softening point of the tackifier to 15 ° C. lower than the softening point because the unwinding force can be adjusted to be lower by the annealing set temperature. This is because they found it.
[0016]
【Example】
Examples of the present invention will be described in detail below.
[0017]
Table 1 shows examples and comparative examples of the self-adhesive sheet according to the present invention. The centerline average roughness Ra (unit: μm) in Table 1 was measured in accordance with JIS B 0601 and JIS B 0633, and the unwinding force was determined by applying the annealed self-adhesive sheet to JIS Z. It was a value measured according to 0237, and was measured by peeling off at a speed of 300 mm / min. The workability shown in Table 1 is x when the tape is unwound by its own weight or when the winding is too heavy, and when the tape is not unwound by its own weight, but the peeling is light or the winding is slightly heavy, Δ The case where peeling and winding were moderate without unwinding due to its own weight was marked as ◯.
[0018]
[Table 1]
Figure 0003827624
[0019]
Here, the self-adhesive sheet of Example 1 in Table 1 is 100 parts by weight of a polyvinyl chloride resin having a polymerization degree of 1300 (manufactured by Taiyo PVC Co.), 55 parts by weight of DOP (manufactured by J-Plus) as a plasticizer, adhesive 10 parts by weight of C 5 C 9 petroleum resin (Esso Chemical Co., softening point 94 ° C.) as an imparting agent, 2 parts by weight of MBS (manufactured by Nippon Synthetic Rubber) as a modifier, Ca—Zn based as a stabilizer 2 parts by weight of a stabilizer (manufactured by Mizusawa Chemical Co., Ltd.), 0.2 parts by weight of St acid (manufactured by NOF Corporation) as a lubricant, and 2 parts by weight of MMA (manufactured by Kaneka Chemical Co., Ltd.) are blended.
[0020]
In Example 1, the above blend is mixed and formed into a film having a thickness of 150 μm by a calendar process. After winding this film on a winding core, annealing was performed for 8 hours in an environment of 90 ° C. (temperature 4 ° C. lower than the softening point of the tackifier). In the calendar process at this time, the center line average roughness (unit: μm) shown in Table 1 is given by an emboss roll.
[0021]
In Example 1, the required unwinding force could be obtained. Therefore, it was possible to obtain a self-adhesive sheet that was not carelessly rewound and easy to wind.
[0022]
In Comparative Examples 1 and 2 and Examples 2 and 3, in the manufacturing method of Example 1, the value of the centerline average roughness Ra was changed by changing the embossing roll during the calendar process. If Ra is in the range of 1.0 to 1.8, the unwinding force is within the desired range and the workability is good, but if it is outside this range, the workability is poor.
[0023]
Comparative Examples 3 and 4 and Example 4 were obtained by changing the annealing temperature in the manufacturing method of Example 1. When the set temperature of annealing is set within the range of 15 ° C. lower than the softening point from the softening point of the tackifier, the unwinding force is within the desired range, and the workability is also good. Workability was poor outside this range.
[0024]
【The invention's effect】
In the present invention, a composition in which 100 parts by weight of a vinyl chloride polymer, 5 to 80 parts by weight of a plasticizer, 3 to 20 parts by weight of a tackifier, and 1 to 10 parts by weight of a modifier are mixed into a sheet form. A self-adhesive sheet formed and comprising the following (1) to (3).
(1) Annealing is performed at a temperature set in a range of 4 ° C. lower than the softening point of the tackifier to 15 ° C. lower than the softening point.
(2) A texture having a center line average roughness Ra of 1.0 to 1.8 μm is provided on the surface of the sheet.
(3) The unwinding force is 1.0 to 1.5 N / 10 mm.
As a result, it was possible to provide a self-adhesive sheet that was not carelessly rewound and was easy to wind.

Claims (1)

塩化ビニル系重合体100重量部、可塑剤5〜80重量部、粘着付与剤3〜20重量部及び改質剤1〜10重量部を混合した組成物をシート状に形成し、以下の(1)〜(3)を具備する自己粘着性シート。
(1)粘着付与剤の軟化点より4℃低い温度〜該軟化点より15℃低い温度の範囲に設定された温度でアニールをする。
(2)シート表面に中心線平均粗さRa1.0〜1.8μmのシボを設ける。
(3)巻戻力が1.0〜1.5N/10mmである。
A composition obtained by mixing 100 parts by weight of a vinyl chloride polymer, 5 to 80 parts by weight of a plasticizer, 3 to 20 parts by weight of a tackifier, and 1 to 10 parts by weight of a modifier is formed into a sheet, and the following (1 )-(3) self-adhesive sheet.
(1) Annealing is performed at a temperature set in a range of 4 ° C. lower than the softening point of the tackifier to 15 ° C. lower than the softening point .
(2) A texture having a center line average roughness Ra of 1.0 to 1.8 μm is provided on the surface of the sheet.
(3) The unwinding force is 1.0 to 1.5 N / 10 mm.
JP2002220851A 2002-07-30 2002-07-30 Self-adhesive sheet and method for producing the same Expired - Fee Related JP3827624B2 (en)

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