JP5015872B2 - 貼付剤の製造方法 - Google Patents
貼付剤の製造方法 Download PDFInfo
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- JP5015872B2 JP5015872B2 JP2008184670A JP2008184670A JP5015872B2 JP 5015872 B2 JP5015872 B2 JP 5015872B2 JP 2008184670 A JP2008184670 A JP 2008184670A JP 2008184670 A JP2008184670 A JP 2008184670A JP 5015872 B2 JP5015872 B2 JP 5015872B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Description
(1)
貼付剤の製造方法であって:
支持体の少なくとも片面上に粘着剤層を、および該粘着剤層上に剥離ライナーを備える粘着シートを用意し;
該粘着シートから、凸状押し切り刃で、支持体の少なくとも片面上に粘着剤層を、および該粘着剤層上に剥離ライナーを備える貼付剤を打ち抜く工程を含み;
ここで、該凸状押し切り刃の少なくとも先端部において、凸状押し切り刃の延設方向に直交する断面形状は、角度aは角度bよりも大きいことを特徴とする、製造方法:
ここで、前記断面形状において、角度aは、刃先先端中心部を通って延びる切れ刃中心線に関し、凸状押し切り刃の貼付剤側を向く面の先端部が該切れ刃中心線に対してなす角度であり;
角度bは、刃先先端中心部を通って延びる切れ刃中心線に関し、凸状押し切り刃の貼付剤側を向かない面の先端部が該切れ刃中心線に対してなす角度である;
(2)
該凸状押し切り刃は、該粘着シートを、支持体側から剥離ライナー側へ切断する、請求項1記載の製造方法;
(3)
該粘着シートから、該凸状押し切り刃を有するダイカッターとアンビルロールとを備えるダイカットロールで、該貼付剤を打ち抜く、(1)または(2)記載の製造方法;
(4)
角度aは、15〜47.5度である、(1)〜(3)いずれかに記載の製造方法;
(5)
貼付剤の粘着剤層の端部の少なくとも一部位は、支持体の端部または剥離ライナーの端部よりも、貼付剤の中央部側に位置する、(1)〜(4)いずれかに記載の製造方法;
(6)
角度bは、0〜27.5度である、(1)〜(5)いずれかに記載の製造方法;
(7)
角度aと角度bの合計角度は、15〜55度である、(1)〜(6)いずれかに記載の製造方法;
(8)
貼付剤の剥離ライナーの端部は、貼付剤の支持体の端部から剥離ライナーへ垂下した線分が剥離ライナーと交わる剥離ライナー上の部位よりも、貼付剤の周辺部側に位置する、(1)〜(7)いずれかに記載の製造方法;
(9)
粘着剤層が有機液状成分を含む、(1)〜(8)いずれかに記載の製造方法;および
(10)
粘着剤層の厚さが100μm以上である、(1)〜(9)いずれかに記載の製造方法;
を提供する。
(1)粘着シートの作製
塗工液の調製
トルエン 6.250kg、n−ヘキサン 8.750kg、高分子量ポリイソブチレン(粘度平均分子量4,000,000)1.043kgを秤量し、調合タンクにて24時間以上攪拌した。その後、中分子量ポリイソブチレン(粘度平均分子量55,000) 2.087kg、脂環族飽和炭化水素樹脂 2.087kg、トルエン 0.500kgを秤量し、調合タンクに投入し24時間以上攪拌した。その後、ミリスチン酸イソプロピル 2.282kg、トルエン 2.000kgを秤量し、調合タンクに投入し4時間以上攪拌して塗工液を得た。
粘着シートの調製
塗工液を、バックロールとコンマロールからなるコーターを用いて、剥離ライナーとしての厚さ75μmのポリエチレンテレフタレート(以下「PET」)の軽剥離面に、乾燥後の粘着剤層厚みは160μmとなるよう塗工・乾燥した。得られた粘着面を、支持体としてのPETフィルム/PET不織布積層体のPET不織布面に圧着させ粘着シートを得た。
試験1および試験2を実施し、粘着シートから、凸状押し切り刃を有するダイカッターとアンビルロールを備えるダイカットロールで貼付剤のサンプルを打ち抜いた。試験1(実施例1〜4及び比較例1〜5)で使用した凸状押し切り刃の先端部のその延設方向に直角な断面形状を図6に示した。試験1では、粘着シートの流れ方向に垂直方向のストレート凸状押し切り刃を有するダイカットロール用いた。試験2(実施例5〜9および比較例6)では、凸状押し切り刃の先端部はその延設方向に略矩形の平面形状を有するダイカットロールを用いた。
粘着シートの支持体面をアンビルロール側に、粘着シートの剥離ライナー面をダイカッター側に配置して粘着シートを切断して、実施例1〜8および比較例1〜6の貼付剤を得た。併せてこのとき、後述の評価基準にて打ち抜き性を評価した。
打ち抜き性
粘着シートから貼付剤を打ち抜いた直後に、下記基準で目視評価した。
〇:正常に打ち抜けている。
△:たまに打ち抜き不良がある。
×:ほぼ打ち抜き不良である。
A.カミソリ刃、木槌、および、アクリル板を準備した。
B.アクリル板上に貼付剤を乗せ、カミソリ刃を貼付剤の支持体の上に垂直に当て、木槌で一回たたき、長さ2cm、幅2cmの略正方形に切断してサンプルを得た。各実施例および比較例につき5個のサンプルを作製した。
C.サンプルそれぞれの断面形状を、デジタルマイクロスコープ(キーエンス製、VHX500)にて観察し(倍率500倍)、下記基準にて評価した。また、試験2においては断面形状撮影も行った。
〇:支持体からライナーに垂下した線分よりも、粘着剤層は内側にある。
△:支持体からライナーに垂下した線分上に、粘着剤層はある。
×:支持体からライナーに垂下した線分上よりも、粘着剤層は外側にある。
試験1の結果を表1に、試験2の結果を表2および図7に示す。
12 支持体
13 粘着剤層
14 剥離ライナー
15 貼付剤
21 粘着シート
22 支持体
23 粘着剤層
24 剥離ライナー
26 凸状押し切り刃
27 貼付剤に向く方向
28 貼付剤に向かない方向
29 硬い台
210 切断方向
211 刃中心線
32 支持体
33 粘着剤層
34 剥離ライナー
35 貼付剤
41 粘着シート
46 凸状押し切り刃
47 ダイカッター
48 アンビルロール
412 アンビルロールの回転軸
52 支持体
53 粘着剤層
54 剥離ライナー
55 貼付剤
59 剥離ライナーへ垂下した線分
513 延出部
514 剥離ライナー端部と支持体端部とが結ぶ線分
Claims (10)
- 貼付剤の製造方法であって:
支持体の少なくとも片面上に粘着剤層を、および該粘着剤層上に剥離ライナーを備える粘着シートを用意し;
該粘着シートから、凸状押し切り刃で、支持体の少なくとも片面上に粘着剤層を、および該粘着剤層上に剥離ライナーを備える貼付剤を打ち抜く工程を含み;
ここで、該凸状押し切り刃の少なくとも先端部において、凸状押し切り刃の延設方向に直交する断面形状は、角度aは角度bよりも大きいことを特徴とする、製造方法:
ここで、前記断面形状において、角度aは、刃先先端中心部を通って延びる切れ刃中心線に関し、凸状押し切り刃の貼付剤側を向く面の先端部が該切れ刃中心線に対してなす角度であり;
角度bは、刃先先端中心部を通って延びる切れ刃中心線に関し、凸状押し切り刃の貼付剤側を向かない面の先端部が該切れ刃中心線に対してなす角度である。 - 該凸状押し切り刃は、該粘着シートを、支持体側から剥離ライナー側へ切断する、請求項1記載の製造方法。
- 該粘着シートから、該凸状押し切り刃を有するダイカッターとアンビルロールとを備えるダイカットロールで、該貼付剤を打ち抜く、請求項1記載の製造方法。
- 角度aは、15〜47.5度である、請求項1記載の製造方法。
- 貼付剤の粘着剤層の端部の少なくとも一部位は、支持体の端部または剥離ライナーの端部よりも、貼付剤の中央部側に位置する、請求項1記載の製造方法。
- 角度bは、0〜27.5度である、請求項1記載の製造方法。
- 角度aと角度bの合計角度は、15〜55度である、請求項1記載の製造方法。
- 貼付剤の剥離ライナーの端部は、貼付剤の支持体の端部から剥離ライナーへ垂下した線分が剥離ライナーと交わる剥離ライナー上の部位よりも、貼付剤の周辺部側に位置する、請求項1記載の製造方法。
- 粘着剤層が有機液状成分を含む、請求項1記載の製造方法。
- 粘着剤層の厚さが100μm以上である、請求項1記載の製造方法。
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