CN1118273C - 用于薄膜制品的可复位襻状闭合系统 - Google Patents

用于薄膜制品的可复位襻状闭合系统 Download PDF

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CN1118273C
CN1118273C CN95195942A CN95195942A CN1118273C CN 1118273 C CN1118273 C CN 1118273C CN 95195942 A CN95195942 A CN 95195942A CN 95195942 A CN95195942 A CN 95195942A CN 1118273 C CN1118273 C CN 1118273C
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R·戈布兰
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Abstract

一种用于一次性尿片(20)等的压敏胶粘闭合系统，其中压敏胶粘性固定襻(4)与非粘连性薄型尿片底衬(2)可剥离地粘合，底衬(2)已经过处理以提高其表面能，而且用剥离材料，在分散的区域，最好以极性溶剂进行了印花。剥离材料底衬在呈卷状时防止发生粘连，并可使压敏胶粘固定襻在从底衬上去除时不损坏底衬。

Description

用于薄膜制品的可复位襻状闭合系统
                              技术领域
本发明涉及改良型一次性产品，即具有可重新固定的压敏胶粘性固定襻，例如尿片、失禁症病人用产品、一次性衣服、妇女卫生产品等。
                              背景技术
要求防水的一次性尿片或失禁症用制品及其它一次性服装通常具有一层不透水层。该不透水层通常是一次性服装的最外层。为了改善一次性服装的牢度和舒适性并尽可能降低成本，不渗透层通常是一层极薄的薄膜，或者与一般由热塑性聚合物(例如聚乙烯之类的聚烯烃聚合物、共聚物或共混物)构成的薄膜层层合。同样很薄的这一聚合物薄膜通常同时被用作粘性表面，压敏胶粘固定襻与之粘合以闭合一次性尿片或其它服装。通常，压敏胶粘性固定襻的一端永久性地粘合于服装某一边缘的聚合物膜上，固定襻另一端宜设计成可除去地固定于靠近服装另一边缘的服装的外表面。固定襻的此第二或自由末端通常与热塑性薄膜或形成不透水层的薄膜层粘合。
上述系统的一个问题是，为了牢固而永久性地固定胶粘片的第一末端，固定襻的压敏胶粘剂必须具有足够强的粘性，以致于如果要从一次性服装上去除固定襻的第二末端，就会使聚合物薄膜或薄膜层撕裂。为此，在本领域中已提出了多种解决方法。例如，曾有人提出通过增加底衬的厚度、使用拉伸强度高的聚合物，或两者结合来提高尿片底衬的拉伸强度；美国专利5,147,346(具有高模量加强层的共挤出底衬)，欧洲专利256885B1(提出一种尿片底衬，含有聚丙烯和低密度聚乙烯的混合树脂，厚1至1.5密耳，此厚度范围大于一般市售底衬，其拉伸强度至少为550克)，美国专利5,084,039(提出一种聚乙烯与乙烯丙烯共聚物之类的抗脱离材料的混合物)，还有美国专利4,880,422(提出一种尿片底衬，由聚丙烯和聚乙烯混合物构成以提高襻的固定粘合强度并提高拉伸强度)。虽然这些较高强度的底衬更能抗撕裂，但是它们也比一般的薄型尿片底衬材料更硬、不舒服而且贵的多。
也有人提出，通过使用粘合强度较低或粘性较小的压敏胶粘剂来降低固定襻的粘性剥离强度。虽然，这可能减少尿片底衬撕裂的发生，但也大大增加了襻在使用中脱落或失效的可能性。总之，人们发现很难找到一种可与已有的薄型尿片底衬匹配的压敏胶粘剂，它在各种条件下均具有理想的粘合性能，可重新固定而不会撕裂底衬，而且使底衬使用舒适而且低成本。
作为不同于加强整个尿片底衬的方法，已经提出了很多方法，即只加强与固定襻粘合的底衬部分。例如，美国专利3,867,940(Mesek)提出在尿片底衬上与尿片固定襻粘合部位的内表面或外表面固定一张稀松布(scrim)或膜，由此加强尿片的底衬。这种强化方法是为了在使用或由父母进行调整(例如移动或调整襻的位置)时防止底衬被撕裂或变形。日本实用新型74910(1982)中提出一种修改方案，即用小型压敏粘合襻仅附着于尿片的特定边缘位置处，尿片固定襻自由端多半是放松地附着。
也有人提出了只在粘合固定襻的游离端的部位附着(如上述日本实用新型74910)，进行较大面积的强化(如Mesek的专利)，例如在美国专利4,643,730中，它提出了一种涂在尿片底衬内表面的光固化涂料。与之类似的，美国专利4,296,750提出在尿片底衬的内表面涂以热熔性胶粘剂来形成大面积的强化。美国专利4,210,144类似地提出，用涂料，例如热熔性胶粘剂类来强化尿片底衬的内表面。欧洲专利80647B1提出将一种薄的塑性材料胶合在尿片底衬的外表面，英国专利2,129,689B中也论述了这一点，后者提出将一条或多条塑料长条胶合在尿片的外侧前缘部分，其中的塑料长条最好是经过压花的，以控制尿片固定襻的粘合强度。
日本公开专利64-77604和实用新型昭和64-37405提出，在尿片底衬的外表面涂以热固化的硅脱模材料和长链烷基脱模材料，分别使得尿片的固定襻既可粘合又可重新固定。
                              发明内容
本发明涉及提供一种改良的系统，用于将高粘性常规尿片固定襻可剥离、可重复地与用作尿片底衬的薄膜之类固定。
本发明的涂有低粘合力粘合剂的底衬粘合闭合系统将参照常规婴儿尿片进行说明，但是，这种闭合系统可以用在其它使用粘性固定襻的一次性应用场合，例如成人失禁症用服装、一次性医用长袍、帽子、包装系统、妇女卫生制品等。
图1描绘了常规尿片的结构。尿片10具有薄的不透水性外部底衬2和透水性内部表层3。底衬2和内部表层3之间是吸附内芯(未示出)。胶粘性固定襻4位于两侧，在底衬2上相对的边缘区7上，并且在尿片的第一末端。在尿片的第二末端，在底衬2上印刷了低粘合力涂层11，它永久性地粘合于薄型尿片底衬2的外表面，由此提供了一个固定襻4的自由末端12可与之粘合、去除和原位重复粘合的表面。低粘合力涂层靠近尿片第二末端的边缘区7，以便在固定襻4的自由末端12与低粘合力涂层粘合时，位于尿片相对末端的两个边缘区7能够重合而闭合尿片。当固定襻4的自由末端12与低粘合力印刷涂层11粘合时，形成腿部孔5，此开孔一般具有可与使用者的双腿形成密闭配合的弹性装置。还可以利用弹性部分6使得尿片的腰部也具有弹性，从而进一步与使用者形成密闭配合。使用前，用涂有剥离涂料的纸或带来保护胶粘性固定襻4的自由末端12的胶粘性表面免受污染，这种纸或带靠近边缘区7一角和第一末端，且在内侧表层3上。
低粘合力印刷涂层11的形状可以是单独的条带或区域，或多根条带或多个区域(例如，各自对应于一个固定襻自由末端12)。一根条带是底衬上印刷了剥离材料的一单独区域。条带11的位置应该是，在将尿片用于使用者时，固定襻的自由末端12能够与条带粘合。条带可以是任意合适的尺寸。图2显示了一种具有较大单根条带21的尿片20。较大的条带为使用者安置固定襻的自由末端提供了较大的靶面积，减少了与底衬上没有印刷低粘合力或可剥离涂料的部分粘合的危险性。
底衬片2是常规形状的，而且一般是聚烯烃薄膜之类(例如聚乙烯薄膜或聚乙烯与其它聚烯烃或热塑性聚合物的混合物，或共挤塑膜，正如本领域所已知的)的不透水性热塑性膜。底衬也可以是两层或多层薄膜，或一张薄膜与无纺或纺织材料之类的层合形式。通常，底衬薄膜2很薄，例如厚度小于50微米的薄膜，小于35微米更好。
底衬2的外表面经处理具有大于约33达因/厘米的表面能，大于约40达因/厘米更好。可以通过适当选择构成底衬外表面的聚合物、添加剂等材料，或通过料片形成后技术，诸如电晕处理、火焰处理、化学打底剂等来获得这样的表面能。较好的是电晕处理。
低粘合力印刷涂料通常是基于水性或极性溶剂的剥离材料，以便能够利用例如平版印刷、凹版印刷、胶版轮转印刷、转筛印刷、喷墨印刷等常规印刷技术进行涂布。较好的是胶版轮转印刷和凹版印刷。也可能使用其它可印刷的剥离材料，例如可固化的100％固体系统。印刷用的剥离材料最好涂成连续的形式(即，100％被剥离材料覆盖的散布区域)，但是，散布区域之间的间隔或不连续也是可以的。如果需要，可以在印刷低粘合力涂料前，在底衬表面的全部或部分区域以无规则或重复方式油墨印刷以装饰性的图案或形状。油墨印刷可以是任意以水性或极性溶剂为基础的油墨，例如美国专利5,302,193；5,310,887；和5,296,275中所述的那些。
剥离材料是任何一种能够通过极性或水性溶剂适当地印刷的材料，这种溶剂不会令热塑性底衬变形或将其溶解。合适的剥离材料可以印刷自溶液、分散液、乳液或悬浮液。
选用于固定襻的压敏胶粘剂以能够使襻与底衬的粘合强于与低粘合力印刷材料的为宜，通常，由其产生的与底衬的剥离粘合力比之与剥离材料印刷区域的粘合力至少高1.2倍。襻与低粘合力印刷区域的粘合力可以是适于特定的最终用途的任意有效强度。对尿片而言，固定襻的135°剥离力(如下文所述)至少为70克/25.4毫米(1英寸)，至少100克/25.4毫米更好。在室温下，将固定襻重复用于低粘合力印刷区域上相同或不同位置所施加的135°剥离力在初始剥离力数值的30％以下，20％以下更好。
胶粘剂可以是任何常规压敏胶粘组合物，但是，以基于橡胶树脂的胶粘剂为宜。
固定襻上的压敏胶粘剂最好是粘弹体，此种弹性体是A-B嵌段共聚物，其中的A嵌段和B嵌段的结构为线性、辐射状或星形。A嵌段是单链烯基芳烃，以聚苯乙烯为佳，其分子量在4,000至50,000之间，以7,000至30,000之间为佳。A嵌段的含量以约10％至50％为佳，约10％至30％更好。可以由α甲基苯乙烯，叔丁基苯乙烯和其它环烷化苯乙烯，以及它们的混合物来形成其它合适的A嵌段。B嵌段是弹性共轭二烯，其平均分子量在约5,000至约500,000之间，以约50,000至约200,000更好。弹性体中最好含有约10％至90％，40％至80％更好的以下两者嵌段共聚物之一，即具有B末端的共聚物，例如A-B二嵌段共聚物，或纯粹的B弹性体，最好是具有B末端A-B嵌段的共聚物。
弹性体基胶粘剂的增粘组份通常包含固体的粘性树脂和/或液体增粘剂或增塑剂。较好的是，粘性树脂选自与弹性聚合物或嵌段共聚物中的二烯类B嵌段部分至少部分配伍的树脂。虽然不是最好，但是，粘性树脂中通常可有较少的部分包含与A嵌段配伍的树脂，如果有这种树脂存在，它们通常被称为末端嵌段强化树脂。通常，这种末端嵌段树脂是由芳香族形成的。
用于固定襻粘合剂组合物的合适的液体增粘剂或增塑剂包括环烷油，石蜡油，芳香油，矿物油或低分子量松香树脂，多萜和C5树脂。
压敏胶粘剂中的增粘剂部分通常相对每100份弹性体相20至300份。较好的是，这部分主要为固体增粘剂，但是，为了与聚乙烯表面粘合，胶粘剂中可以有0至25％(重量)，以0至10％(重量)为佳，是液体增粘剂和/或增塑剂。
其它常规压敏胶粘剂也可用在与低粘合力印刷底衬粘合的固定襻上，例如丙烯酸酯基胶粘剂或基于其它二烯或非二烯弹性体或天然橡胶的胶粘剂。
                              附图说明
图1是使用了本发明低粘合力涂料的常规尿片在穿着时的结构透视图。
图2是利用本发明另一种实施方式的常规尿片结构透视图。
                            具体实施方式
从部分固定的涂有剥离涂料的薄膜上的135剥离粘合力
测试板为5.1cm×12.7cm(2英寸×5英寸)的洁净钢板，在5.1cm(2英寸)的两边各粘有一条1.9cm(0.75英寸)的双面胶带。将一张印刷了剥离涂料的薄膜松弛地覆盖在测试板上，使其平整而无任何褶皱。低粘合力剥离涂料印刷薄膜的横向平行于测试板的纵向。将薄膜紧密辊压在双面胶带上，修去超出测试板边缘的多余的薄膜。
用于测试的压敏胶带的胶粘剂组合物为：40％(重量)KratonTM1111(ShellChemcal Co.的一种聚苯乙烯-聚异戊二烯线性嵌段共聚物，其中约含15％二嵌段和85％三嵌段，约含21％苯乙烯)，47％(重量)WingtackTM Plus(GoodyearChemical Co.的一种C5固体增粘树脂)，13％(重量)ShellflexTM371(Shell ChemcalCo.的一种环烷油)，1％(重量)IrganoxTM1076(Ciba-Geigy的一种受阻碍酚性抗氧化剂)。将胶粘剂热熔涂布在102微米(4密耳)，洁净的注塑无光泽/无光泽聚丙烯薄膜(用于注塑薄膜的聚丙烯均聚树脂是#5A95，可购自Shell ChemcalCo.)底衬上。胶粘剂的涂布厚度为44微米。每一条测试带为2.5cm×6.5cm(1英寸×2.5英寸)，在胶带的最后0.6cm(0.25英寸)粘有2.5cm×20.3cm(1英寸×8英寸)的引出端。将胶带的纵向与测试板的纵向平行放置，使胶带距离测试板的各端基本等距，而且位于两侧之间的中部。将胶带放下时不施加任何附加压力。马上用一个2公斤(4.5磅)重的橡胶辊将胶带辊压两次，然后进行测试。
使用InstronTM张力测试仪测试样品的剥离力。整个剥离过程中以135度角进行测试，十字头速度恒定为每分钟30.5cm(12.5英寸)。给出的均为按宽度方向的剥离粘合力值(克/2.54cm)。实施例1和比较实施例1
对一卷25.4微米(1密耳)厚的，一面经电晕处理过的压花聚乙烯尿片底衬薄膜(Clopay Corporation的“MICROFLEXTM”)在其未经电晕处理的一面进行电晕处理，以形成约0.0038N/cm(38达因/厘米)的表面能。不对这些薄膜的两面都进行电晕处理，因为这样做会使薄膜粘连而不能绕成卷状。
然后在实施例1的薄膜上，如图1所示，在分散的区域中以固含量为5％的“HITACTM”RA-11水溶液(Mayzo，Inc.，Norcross，Georgial的一种改性聚氨酯剥离材料)进行凹版印刷并于49℃(120)烘干。用于印刷剥离材料的辊筒为140型(140 Ruling Mill Cell V-Shape Plain Diagonal Line Direct HeavyApplication)，可购自International Engraving Corporation，Cedar Grove，NewJersey。线速度为12米/分钟(40英尺/分钟)。较理想的是，只涂以足量的剥离材料以使薄膜的印刷区域具有一致的剥离特性。利用设计更合理的设备和过程可以更精确地控制剥离材料的涂布重量。
为了比较(比较实施例1)，聚乙烯尿片底衬薄膜样品被印刷以上述剥离材料，但在印刷剥离材料前，没有在未经电晕处理的这一面进行电晕处理。
如上制备的每张印刷了剥离涂料的薄膜，在其剥离涂料印刷区用5条测试胶带测试135度剥离粘合力。结果列于表I。
                           表I
    测试胶带     实施例1(135°剥离粘合力)    比较实施例1(135°剥离粘合力)
    1     99     64
    2     109     847
    3     101     787
    4     118     622
    5     112     734
数据显示，在同一实施例I薄膜上同一位置剥离多条胶带后，剥离粘合力并不明显增加。这表明，几乎没有或完全没有剥离材料转移到测试胶带的胶粘层上。相反，没有电晕处理过的比较实施例1薄膜样品在剥离多条测试胶带后表现出明显的剥离粘合力上升，并且可观察到严重的薄膜拉伸现象。这表明，剥离材料没有充分与比较实施例1的薄膜粘合，因而使得剥离材料转移到了测试胶带的胶粘层。
还测试了将同一测试胶带从同一剥离涂料印刷薄膜样品上剥离后再在薄膜上的相同位置，即胶带最初粘贴的位置重复粘贴4次的135度剥离粘合力。结果列于表II。
                            表II
     实施例1(135°剥离粘合力)   比较实施例1(135°剥离粘合力)
    初剥离     99     66
    第一次重复粘贴     106     96
    第二次重复粘贴     108     125
    第三次重复粘贴     104     146
    第四次重复粘贴     120     164
数据显示，实施例1的印刷了剥离涂料的薄膜其剥离粘合力值没有明显的增加(增加值在试验偏差的范围内)。这表明几乎没有或完全没有剥离涂料转移到测试胶带的胶粘层。对于印刷了剥离涂料的比较实施例1薄膜，发现了较为明显的剥离粘合力增加(是最初剥离粘合力值的2.5倍)。这表明有较为严重的剥离涂料向测试胶带胶粘层转移现象。
还测试了同一测试胶带从5份实施例或比较实施例样品上剥离的135度剥离粘合力。结果列于表III。
                           表III
 薄膜样品      实施例1(135°剥离粘合力)    比较实施例1(135°剥离粘合力)
    1     90     56
    2     82     23
    3     83     14
    4     90     9
    5     80     8
以上数据显示，同一测试胶带从5份实施例1薄膜样品上剥离，其剥离粘合力几乎没有差异。这表明几乎没有或完全没有剥离材料转移到测试胶带的胶粘层。相反，在印刷剥离材料前未经电晕处理的比较实施例1胶带，其剥离粘合力急遽下降。
还测试了将两组层合件(每组4份实施例1的胶带/薄膜)在38℃(100)分别老化4小时和24小时后的与剥离涂层剥离粘合力。热老化不引起明显的剥离粘合力改变。结果列于表IV。
             表IV
   实施例1(135°剥离粘合力)
    初值     68
    4小时，38℃     102
    24小时，38℃     98
实施例2
如实施例1所述制备一卷印刷了剥离涂料的聚乙烯尿片底衬薄膜，所不同的是，所用的剥离材料是有机聚硅醚-聚脲共聚物。此共聚物由有机聚硅醚二胺与二异氰酸酯和二胺链延伸剂缩聚而成。硅氧烷二胺片段的分子量约为5,000，根据美国专利5,214,119和5,290,615制备。然后将硅氧烷二胺与“JEFFAMINETM”DU-700(Texaco Co.提供)，1，3-二氨基戊烷，和二异氰酸异佛尔酮酯反应生成含约20％(重量)硅氧烷，25％(重量)“JEFFAMINETM”片段和55％(重量)硬片段的聚合物。用固含量5％的异丙醇溶液对此有机聚硅醚-聚脲进行印刷，在60℃(140)干燥。线速度为21米/分钟(70英尺/分钟)。如实施例1所述，用5条胶带测试与同一印刷了剥离涂料的薄膜的135度剥离粘合力。结果列于表V。
           表V
    测试胶带        实施例2(135°剥离力)
    1     89
    2     90
    3     92
    4     94
    5     96
以上数据显示，在同一薄膜样品的同一位置剥离多条测试胶带后，剥离粘合力并不明显增加。
还测试了将同一测试胶带从同一剥离涂料印刷薄膜样品上剥离后再在薄膜上的相同位置，即胶带最初粘贴的位置重复粘贴4次的135度剥离粘合力。结果列于表VI。
                表VI
       实施例2(135°剥离力)
    初次剥离     85
    第一次重复粘贴     70
    第二次重复粘贴     74
    第三次重复粘贴     81
    第四次重复粘贴     71
以上数据显示，将测试胶带多次重复粘贴于实施例2薄膜上相同区域，即胶带最初粘贴的位置后，剥离粘合力几乎没有差异。
还测试了同一测试胶带从5份实施例2的剥离涂料印刷薄膜上剥离时的135度剥离粘合力。结果列于表VII。
            表VII
    薄膜样品        实施例2(135°剥离力)
    1     78
    2     79
    3     75
    4     76
    5     79
以上数据显示，同一测试胶带从多份实施例2薄膜样品上剥离时，剥离粘合力几乎没有差异。
还测试了将两组层合件(每组4份实施例2的胶带/薄膜)在38℃(100)分别老化4小时和24小时后的剥离粘合力。热老化不引起明显的剥离粘合力改变。结果列于表VIII。
            表VIII
          实施例1(135°剥离粘合力)
    初值     78
    4小时，38℃     69
    24小时，38℃     87
实施例3-6
按照实施例1的方法制备一卷印刷有剥离涂料的聚乙烯薄膜，所不同的是薄膜未经电晕处理的一面不进行电晕处理，而涂以某种底料溶液，然后再印刷以剥离涂料。表IX中列出了使用的底料溶液。用International Engraving Corporation，Cedar Grove，New Jersey的200型辊轮(用于胶版印刷的锥形孔)以5％(重量)的溶液进行底料的凹槽辊涂。然后将涂有底料的薄膜在49℃烘干。线速度为12米/分钟。
然后将涂有底料的薄膜凹版印刷以固含量为2％的“HITACTM”RA-11剥离涂料水溶液，再在49℃(120)烘干。线速度为12米/分钟(40英尺/分钟)。印刷剥离涂料所用的辊轮仍然是涂布底料溶液所用的200型辊轮。
如上所述制备另一卷印刷了剥离涂料的聚乙烯尿片底衬薄膜，所不同的是，薄膜上未经电晕处理的一面不是涂以底料溶液，而是对其进行火焰处理。使用的是具有天然气/空气(空气与天然气之比为10.3∶1)预混焰的4300BTU/hr/in的螺带式喷灯。螺带式喷口与薄膜之间的距离为7mm，然后用冷却夹辊处理薄膜。线速度为150米/分钟。由此形成大于52达因/厘米的薄膜表面能。测试了将同一测试胶带从同一剥离涂料印刷薄膜样品上剥离后再在薄膜上的相同位置，即胶带最初粘贴的位置重复粘贴4次的135度剥离粘合力。结果列于表IX。
                                表IX
  实施例3   实施例4   实施例5   实施例6
  处理方法  CP-347W1底料  CP-349W1底料  CP-310W1底料   火焰处理
  初次剥离     236     254     172     252
第一次重复粘贴     266     270     185     253
第二次重复粘贴     301     300     208     257
第三次重复粘贴     304     286     225     286
第四次重复粘贴     340     336     214     289
1CP-347W，CP-349W和CP-310W底料都来自Eastman Chemicl Co.，Kingsport，TN。它们都是粘合力促进剂分散系，该分散系是基于Eastman CPO的水包油型乳液。
以上数据显示，在将同一胶带在同一剥离涂料印刷薄膜样品的相同位置多次重复粘贴时，剥离粘合力略有增加。在剥离时，薄膜发生很轻微的拉伸，然后可复原。
实施例7，和比较实施例2
按照前文实施例1所述的方法制备一卷印刷了剥离涂料的聚乙烯尿片底衬薄膜，所不同的是，在电晕处理后，印刷剥离材料前，用基于极性溶剂的油墨在薄膜上印花。使用的油墨印刷图案是面积为5cm×20cm(2英寸×8英寸)的玩具熊。该油墨印花区的大小与图1所示的一次性尿片中常用的前缘加强条相同。在料片约1.63米(64英寸)的宽度方向，间隔地印以5块图案。然后在印花薄膜的图案内部和周围印刷以剥离涂料，然后烘干。使用的剥离涂料是5％(重量)的“HITACTM”RA-11溶液，使用的是180列激光刻花陶瓷胶版印刷辊筒(45度的无规则刻花)，其体积为3.51×109μm3/cm2(可购自Stork Cellramic)。线速度为183米/分钟。然后将料片宽度方向的5个印刷了剥离涂料的印花图案取作薄膜样品，测试其135度剥离粘合力。测定的是分别将同一测试胶带从每份薄膜样品(共5份)上剥离后再在同一薄膜上的相同位置，即胶带最初粘贴的位置重复粘贴4次的135度剥离粘合力。135度剥离粘合力数据列于下文表X。
                                        表    X
  薄膜样品     1135°剥离力     2135°剥离力     3135°剥离力     4135°剥离力     5135°剥离力
  初次剥离     71     95     75     99     78
第一次重复粘贴     69     107     75     110     75
第二次重复粘贴     85     112     78     100     87
第三次重复粘贴     82     98     87     99     80
第四次重复粘贴     81     107     81     114     85
以上数据显示，同一胶带在同一薄膜样品的相同位置重复粘贴后，剥离能力略有上升。油墨和/或剥离材料没有转移到胶粘层上，而且在剥去胶带时，尿片底衬薄膜没有被撕裂或拉伸。
为了进行比较(比较实施例2)，再制备一卷薄膜，在印花和随后的印刷剥离涂料前没有进行电晕处理。如上所述对该薄膜进行测试。数据归纳于表XI。
                               表    XI
  薄膜样品    图案1    图案2    图案3    图案4    图案5
  初次剥离     171     200     203     229     204
第一次重复粘贴     205     241     239     249     252
第二次重复粘贴     241     289     246     285     278
第三次重复粘贴     279     293     283     310     337
第四次重复粘贴     297     335     304     330
以上数据显示，同一胶带在比较实施例2的印花剥离涂料印刷薄膜样品的相同位置多次重复粘贴后，剥离粘合力有较为明显的上升。各次测试中都有油墨转移到胶带上，这是不合要求的。在剥离时，薄膜的拉伸很轻微，然后能够复原。
在用低粘合力的剥离涂料印花后，所有的实施例薄膜都制成卷状。尽管全部薄膜的印刷表面中有75％以上没有印以低粘合力涂料，这些薄膜卷能够方便地被打开，不发生粘连。
通常，薄膜的印刷面积中至少有10％印刷以剥离涂料。印刷量低于此值时，可能会发生薄膜粘连。

Claims (14)

1.一种压敏胶粘闭合系统，包括至少两个相对的闭合表面和一段压敏胶粘固定襻，该固定襻的第一自由末端通过其第一面上的压敏胶粘层与第一闭合表面的第一面可去除地粘合，所述固定襻的第二相对端与第二相对闭合表面的第一面永久性粘合，其中，至少第一闭合表面的第一面印刷有可固化的100％固体、基于极性溶剂或水的剥离材料，使得固定襻的自由端能够与第一闭合表面上同一或不同的剥离材料印刷位置以至少约70g/25.4mm的135°剥离粘合力可除去地粘合至少两次，所述的第一闭合表面包含一热塑性薄膜或热塑性层合薄膜，薄膜厚度小于约50微米。
2.根据权利要求1所述的压敏胶粘闭合系统，其中的第一闭合表面是热塑性聚烯烃或聚烯烃共混膜或共挤塑膜。
3.根据权利要求2所述的压敏胶粘闭合系统，其中的第一闭合表面是聚乙烯或聚乙烯共混膜或共挤塑膜。
4.根据权利要求1所述的压敏胶粘闭合系统，其中的第一闭合表面在印刷剥离材料前具有大于约33达因/厘米的表面能，剥离材料至少覆盖印刷后第一闭合表面的10％。
5.根据权利要求1所述的压敏胶粘闭合系统，其中的第一闭合表面在印刷剥离材料前具有大于40达因/厘米的表面能。
6.根据权利要求1所述的压敏胶粘闭合系统，其中的剥离材料被印刷成一种连续的印刷图案。
7.根据权利要求6所述的压敏胶粘闭合系统，其中第一闭合表面的第一面是经电晕处理的。
8.根据权利要求1所述的压敏胶粘闭合系统，其中印刷的剥离材料的形式是位于第一闭合表面第一面上部分区域的一根或多根条带，使用者可将固定襻的自由末端粘贴于这些部分。
9.根据权利要求3所述的压敏胶粘闭合系统，其中第一闭合表面薄膜的厚度小于约35微米。
10.根据权利要求3所述的压敏胶粘闭合系统，其中的第一和第二闭合表面包含相同的、构成一次性服装中不透水层的薄膜。
11.根据权利要求10所述的压敏胶粘闭合系统，其中的一次性服装包括尿片，所述固定襻利用所述第二闭合表面上无剥离材料区域的压敏胶粘层与所述第二闭合表面永久性粘合。
12.根据权利要求1所述的压敏胶粘闭合系统，所述的压敏胶粘固定襻包含压敏胶粘剂，所述压敏胶粘剂包含胶粘性A-B型嵌段共聚物弹性体，其中的A嵌段包含单链烯基芳烃，B嵌段是弹性体性共轭二烯。
13.根据权利要求12所述的压敏胶粘闭合系统，其中的剥离材料包含聚氨酯剥离材料。
14.根据权利要求12所述的压敏胶粘闭合系统，其中的剥离材料包含有机聚硅醚-聚脲剥离材料。
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