CN1018150B - 卫生巾 - Google Patents

卫生巾

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CN1018150B
CN1018150B CN88104638A CN88104638A CN1018150B CN 1018150 B CN1018150 B CN 1018150B CN 88104638 A CN88104638 A CN 88104638A CN 88104638 A CN88104638 A CN 88104638A CN 1018150 B CN1018150 B CN 1018150B
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sanitary towel
parts
copolymer
flank sheet
tape splice
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CN1031477A (zh
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拉尔夫·科普曼
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Personal Products Co
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Abstract

一种具有用来包着内裤的裤裆部分的侧翼片的卫生巾，包括一个固定到一个翼片的多孔薄膜面层上的粘合胶带接头，其自由端在折叠状态下叠置在对面的翼片上。在胶带接头上的粘合剂涂层是一种具有一个每英寸宽度75-140英两的对钢的粘附力值的A-B-A/A-B聚合物，它给胶带接头提供可靠的附着性能同时能够在分离时基本上不会撕裂多孔薄膜面层。

Description

本发明涉及一种具有用来包过内裤的裤裆部分的侧翼片的卫生巾，更具体来说涉及一种用来将这些侧翼片固定一起在折叠位置的粘接胶带接头。
具有用来复盖在内裤的外裤裆部分的侧翼片的卫生巾曾被建议作为一种改进附着可靠性和保护内裤边缘防止沾污的装置，美国专种4，608，047公开了一种这类的卫生巾，其侧翼片在它们复盖着内裤的外裤裆部分的部位内相互迭盖。在一个最佳实施例中，折片配有将它们固定就位的装置，如将一种压敏粘合剂这样来设置使折片在其相叠处相互粘合，或是粘附在内裤的外裤裆部分，或者同时两者。
美国专利4，285，243公开了一种同类的卫生巾，其每一侧翼片配有粘附装置，因而，当这些侧翼片折叠盖着内裤的外表面时每一翼片被粘附固定在位。翼片可能相叠，使一个固定到另一个上而另一个则固定到内裤上，或者这些翼片可以只是相互紧靠着，每个翼片独自粘附固定到内裤上。本发明指向一种具有侧翼片卫生巾，这些翼片是通过事先附着在一个翼片上的一单条粘接胶带固定定位复盖在内裤的外裤裆部位上的。卫生巾要使用时，首先将不带胶带的翼片包过内裤的裤裆部分，跟着盖上带胶带接头的第二翼片。侧翼片和胶带接头要有足够的长度来保证胶带接头可靠地粘附到相对的翼片上。
为便于应用，胶带接头装在卫生巾的透液包层上，这包层在卫生巾就位时是朝外的。一种特别推荐的卫生巾用一种多孔聚乙烯薄膜作为透 液包层，这种薄膜在跟粘接胶带接头的连接上带来一个独特的问题。一方面聚乙烯薄膜的成份和大的开孔面积要求一种比较强的粘合剂来保证可靠地粘附到多孔薄膜材料上。另一方面，薄膜很薄，由于孔的存在很很容易撕裂。这样，提供一种在这个用途中有效的粘合剂方是遇到很多困难的。
因此本发明的一个目的在于提供一种改良的卫生巾，它具有侧折片，其上带有用来将这些侧折片围绕着内裤的外裤裆部分固定住的粘附装置。本发明还有一个目的在于提供一种卫生巾，它具有侧折片，这些折片通过一个从一个折片的边缘伸展出来的胶带接头固定到另一折片的表面上。本发明又另一个目的在于提供一种用来固定一种卫生巾的折片的粘接胶带接头，它提供对一个多孔薄膜面层的可靠的粘附而能够在分离时不会大范围地撕裂这些面层材料。本发明的这些以及其他的目的，从随后的描述和权利要求中将表达得更为清楚。
本发明的卫生巾的基本结构包含一个一面包着一种不透潮气的衬底材料、另一面包着一种透潮气的多孔聚合物薄膜的吸收体芯子。这卫生巾包括含有延长的衬底和面层材料的侧折片。固定在一个侧折片的面层材料上的一个胶带接头伸展越过该折片，并含有一片防粘的纸来保护在胶带接头自由端上的外露粘合表面。这胶带接头和侧折片要伸展得足够长使胶带接头的自由端在包过内裤的裤裆部分时伸展到相对的侧折片的表面上并固定在那里。
胶带接头的衬底材料是用诸如薄膜、纸或织物，其上涂有一种粘结物质，这粘结物质的基础是A-B-A与A-B嵌段共聚物的混合物，配上一种增粘树脂并具有一个从约每厘米宽为837至1563克的对钢的粘附力。这种粘合剂配方很好地粘附到多孔聚合物薄膜上而在需要时还能干净地分离，不给薄膜材料带来显著的撕裂。
图1是一个卫生巾的顶视图，示出按本发明的胶带接头的设置部位
图2是通过图1的卫生巾的中心的横剖视图，示出卫生巾的构造。
图3是图1的卫生巾附着到内裤上的底视图，侧折片折叠起来并被胶带接头固定住。
在图1中总的以10表示的本发明的卫生巾含有一个中央长形吸收体部分11，它可以是基本上长方形或如图所示的砂漏形。侧翼片或折片12与13从中央部分的纵向侧缘横向伸展。胶带接头14粘附在翼片12上，接头如图所示那样伸展越过翼片的边缘。在胶带接头自由端上的外露粘合表面用一片防粘纸15保护着，从图2可清楚地看出。
卫生巾的基本结构在沿图1的线2-2取的图2的剖视图上示出。中央吸收体元件16封闭在衬底片17和一张透液面层片18之间。衬底与面层片在沿卫生巾外缘19处用热封或粘结方法封接在一起。此外，衬底与面层片最好在横跨翼片贴近中央吸收体元件的区域20处封接在一起。
吸收体元件最好是木浆原料或其它卫生巾用的常规吸收材料。衬底片最好用诸如聚乙烯的聚合物薄膜，也可以用适用于此用途的任何不透潮气的材料。本发明的透潮气面层18是一层薄的多孔聚合物薄膜。胶带接头最好含有一个如聚酯薄膜的基材21，采用在下面将更充分地描述的粘接物质22来涂敷在其上。
多孔聚烯烃薄膜，特别是聚为烯与聚乙烯，一直是广泛地用来作为吸收的包层材料，因为这些薄膜价廉，不吸收并且容易生产。适用的薄膜的厚度一般是从1到30密耳，最好是3到10密耳，开孔面积约为30到60%，特别适宜用作包皮材料的是美国专利4，490，679所描述的共挤塑的聚乙烯与乙烯乙酸乙烯酯（EVA）多孔薄膜，这种薄膜的平均开孔面积约为42%，厚度约为4.5密耳，重量约为每平方码一英两。孔口的平均等效直径约为0.016英寸，平均中心距离约为0.028英吋。薄膜的用作贴身侧的聚乙烯的一侧的熔点比薄膜的EVA的一侧高，这就允许薄膜进 行热粘合而同时保持结构上的牢固性。薄膜的外面的聚乙烯组份可用碳酸钙进行褪光而EVA组份可加二氧化钛颜料来增加薄膜的不透明度。
在图2上进一步示出，上述的卫生巾可在衬底材料的中央纵向部分的外面上包括一条或多条粘附条带23来将卫生巾直接附着在内裤上。如存在这些粘附条带，在卫生巾使用前它们要被防粘纸24保护着。可用于本发明的卫生巾的这些结构元件与材料是卫生巾常规使用的并且是该行业熟悉的。而且在结构上与材料的选用上很多变化是可能的并且包括在本发明的范围之内。
图3示出在使用中的卫生巾的定位设置，在图中卫生巾10附着在内裤30的裤裆部分上，侧折片12与13折叠包裹着内裤的下端。胶带接头14的去掉防粘纸15的自由端附着到折片13的多孔薄膜表面上来将折片12与13固定在它们的折叠好的位置上。如要将卫生巾卸除，胶带接头14一定要从折片13的表面脱开，而在本发明以前，这样的折卸常常导致多孔薄膜包皮材料撕裂。
当侧翼片12与13围绕内裤外表面折叠时，它们可以迭盖、相靠或离开设置。当这些侧翼片的尺寸是这样来定使它们的端部在折叠形态是分开设置的情况下，胶带接头必须要有足够的长度来横跨这个距离并能可靠地附着在对面的翼片的表面上。这个结构确实有侧翼片粘附到内裤的织物上并相互粘附的优点，从而提高了卫生巾附着的可靠性。
本发明的胶带接头14所用的粘结物质22是好是如美国专利4，554，191所公开的那一种增粘的苯乙烯-异戊二烯-苯乙烯/苯乙烯-异戊二烯嵌段共聚物。如在该专利中所述，诸如在美国专利4，136，071与3，676，202中所公开的A-B-A嵌段共聚物，通过将一定比例组合的A-B与A-B-A嵌段共聚物跟一个高比例的固体增粘树脂混合起来就可以变成高度发粘。另一方案，粘合到可以用一种苯乙烯-异戊二烯-苯乙烯共聚物来生产，只要这种共聚物聚合到如Kraton    1117（一种壳牌化学公司 出售的热塑性的、弹性体的A-B-A/A-B共聚物）一样的正确的A-B/A-B-A嵌段比例。该A-B-A/A-B共聚物可以加高量的各种固体增加粘树脂如烃类、多萜烯或松香酯来增加粘性，并可包括各种抗氧化剂和其它添加剂。这粘结成份可以用挤压法、热烷法、轻压法或溶剂法涂布到基材上。
粘合剂成份最好含有一种弹性体组份，这组份含有约25至85份重量比的一种简单A-B嵌段共聚物，其中A嵌段块是由苯乙烯或苯乙烯同类物构成的而B嵌段块是由异戊二烯构成的，并含有约75至15份的一种A-B-A嵌段共聚物，其中A与B嵌段块如上面所界定的一样。在A-B嵌段共聚物里的A嵌段块最好占A-B共聚物的约10至35%重量比，并且总的A-B与A-B-A共聚物最好含不多于约30%苯乙烯。这弹性体组份跟约100到150份固体增加剂配在一起，该增粘剂的份数是对应于100份重量比的弹性体组份的。粘性层最好含有25至65份A-B共聚物、约75至35份A-B-A共聚物，和约120至140份重量的固体增粘剂树脂，所有都是接100份重量比的A-B-A/A-B弹性体组份计算的。美国专利3，239，478与3，676，202对本发明所采用的弹性体嵌段共聚物提供了一个很好的描述。
一个最佳的粘附层22的配方具有以下的成份：
Krton    1117：100份（kraton    117是一种聚苯乙烯-聚异戊二烯-聚苯乙烯塑性塑料弹性体，蚬壳化学公司出品，被认为是含约35份A-B和65份A-B-A）;
Wingtack    Plus：120份（Wingtack    Plus是一种固体增粘剂树脂，固特巽（Goodyear）轮胎与橡胶公司出品，主要含有由戊间二烯与异戊二烯衍生的聚合结构，软化点约95℃）;
Butye    Zimate：2份（一种抗氧化剂二正丁基二硫代氨基甲酸锌商品名）;
Santovar    A：1份（一种抗氧化剂2，5-二叔戊基对苯二酚的商品名）。
本发明的胶带接头所用的基材最好是一种塑料薄膜、非纺织物、纺织物或纸。推荐的基材是1密耳厚聚酯薄膜。
一种粘接胶带的粘附力的数值被界定为剥离一种原先固定到一个干净的不锈钢板的表面上的压敏粘接胶带所需的力，单位是每英寸带宽的英两数。粘附层22最好具有每英寸宽度、约从75至40英两，最好约为每英寸宽度100-120的粘附力值。这个水平的粘附力，结合这里公开的A-B-A/A-B粘合剂的粘结与脱离性能，提供了对多孔聚合物薄膜的可靠附着并且容易脱离而不引起薄膜材料的大范围撕裂。
从上所述，可以观察到本发明指一种具有包着一层透液多孔薄膜的横向侧翼片的卫生巾的改进，在其中侧翼片在使用过程中被一个粘接胶带接头固定住，这粘接胶带接头含有一种增粘的A-B-A/A-B弹性体共聚物粘合剂配方，其对钢的粘附力的数值约从每英寸宽度75至140英两。对于这里描述的特定实施例可以做出很多变化与改型，但都没有脱离本发明的新颖观念的精神与范围之内。

Claims (10)

1、一种含有一个中央长形吸收体部分的卫生巾，其吸收体部分具有侧翼片从其纵向边缘横向伸展，所述吸收体部分与所述侧翼片在一面上包着一层透液多孔聚合物薄膜，所述侧翼片可围绕所述中央吸收体部分折叠，所述多孔聚合物薄膜表面朝外，其特征在于改进含有将一个涂复有粘结剂的胶带接头固定到所述侧翼片之上，所述胶带接头的一部分伸展越过该侧翼片并这样来设置使该胶带接头的自由端在所述侧翼片围绕中央吸收体部分折叠时伸展盖在另一个所述侧翼片的多孔薄膜表面上，所述胶带接头的粘结剂涂层具有一个从约837至1563克/厘米宽度的对钢的粘附力值。
2、按权利要求1的卫生巾，其特征在于所述胶带接头的所述粘结剂涂层含有一种热塑性弹性体组份和一种树脂组份，所述热塑性弹性体组分含有约25至85份的一种简单的A-B嵌段，其中A嵌段块由苯乙烯或苯乙烯同类物构成而其B嵌段块由异戊二烯构成，并含有约75至15份的一种A-B-A嵌段共聚物，其中的A与B嵌段块如上面所界定的一样，在A-B嵌段共聚物里的A嵌段块占A-B共聚物的约10至35%重量比，而总的A-B与A-B-A共聚物含不多于约30%苯乙烯，所述树脂组份含有约100至150份的一种固体增粘剂，所有所述份数是对应于100份重量比的热塑性弹性体组份的分数。
3、按权利要求2的卫生巾，其特征在于所述粘结剂含有约25至65份的A-B共聚物和约75至35份的A-B-A共聚物。
4、按权利要求3的卫生巾，其特征在于所述粘结剂含有约120至140份重量比的一种固体增粘剂树脂。
5、按权利要求1的卫生巾，其特征在于所述多孔聚合物薄膜是一种聚烯烃薄膜。
6、按权利要求5的卫生巾，其特征在于所述聚烯烃薄膜选自聚丙烯、聚乙烯、和聚乙烯/乙烯乙酸乙烯酯双组份薄膜。
7、按权利要求1卫生巾，其特征在于所述多孔薄膜的厚度是从1至30密耳，其开孔面积是从30至60%。
8、按权利要求7的卫生巾，其特征在于所述薄膜具有一个从3至10密耳的厚度。
9、按权利要求8的卫生巾，其特征在于所述薄膜是共挤塑性聚乙烯/乙烯乙酸乙烯酯，其重量约为每平方码一英两。
10、按权利要求1的卫生巾，其特征在于所述粘结剂具有基本上是以下的配方：
100份聚苯乙烯-聚异戊二烯-聚苯乙烯塑性塑料弹性体
120份由戊间二烯与异戊二烯衍生的聚合物固体增粘剂树脂
2份二正丁基二硫代氨基甲酸锌抗氧化剂
1份2，5二叔戊基对苯二酚抗氧化剂。
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