CN106687082B - 弹性热熔粘合剂组合物及用其制备的弹性复合物 - Google Patents

弹性热熔粘合剂组合物及用其制备的弹性复合物 Download PDF

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Publication number
CN106687082B
CN106687082B CN201580047869.4A CN201580047869A CN106687082B CN 106687082 B CN106687082 B CN 106687082B CN 201580047869 A CN201580047869 A CN 201580047869A CN 106687082 B CN106687082 B CN 106687082B
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hot melt
melt adhesive
adhesive composition
elastic composite
elastic
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CN106687082A (zh
Inventor
D·B·马尔科姆
K·P·戴维斯
Y·顾
P·雷默斯
T·维特科普夫
K·J·贝克曼
M·S·克罗尔
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HB Fuller Co
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HB Fuller Co
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Abstract

本发明提出了一种热熔粘合剂组合物，所述热熔粘合剂组合物可用于形成可用在一次性吸收制品中的弹性复合物。所述组合物在177℃(350℉)下小于约15,000cps的粘度下具有良好的弹性回复率和高的剥离粘合力。所述低粘度使得以高线速度施加所述热熔粘合剂并且只针对性施加到需要弹性性能的那些区域成为可能。

Description

弹性热熔粘合剂组合物及用其制备的弹性复合物
本专利申请要求2014年9月9日提交的临时提交专利申请号62/048047和62/048066以及2015年6月4日提交的临时专利申请号62/171129的优先权和权益。
背景技术
粘合剂通常用于将基底粘结在一起。在工业粘合剂领域中，通常使用热熔粘合剂来将多种制品粘结在一起，这些制品包括具有非织造基底的一次性吸收制品，例如尿布、训练裤、手术服、泳装、吸收内裤、成人失禁用品、卫生巾和医用敷料(例如，伤口护理产品)。
在一次性吸收制品的制造中可以使用多种热熔粘合剂。例如，在一次性尿布的制造中，热熔粘合剂用于构造(例如，将底片粘结到非织造材料和任选的吸收垫上)、弹性附接(例如，将弹性材料粘结到例如腿部或腰部的底片上)以及芯稳定(例如，将热熔粘合剂施加到吸收芯以增加芯的强度)。
热熔粘合剂也可用于形成可用在一次性制品中的弹性复合物。目前，弹性复合物常被形成在包括以下层的5层构型中：非织造材料、热熔粘合剂、弹性材料、热熔粘合剂、非织造材料。热熔粘合剂将非粘性弹性层粘结到非织造材料以形成复合物。
作为另外一种选择，具有弹性特性的热熔粘合剂可替换弹性材料和粘合剂层两者以形成简化的3层弹性复合物，该复合物可赋予一次性制品的各部分以拉伸特性。
发明内容
在一个实施例中，本发明包括弹性复合物，该弹性复合物包含第一基底和第二基底；以及第一基底和第二基底之间的热熔粘合剂组合物，由此将第一基底和第二基底永久地彼此粘结并在粘结面积提供弹性，所述热熔粘合剂组合物包含约35重量％至约60重量％的一种或多种苯乙烯嵌段共聚物，其中该一种或多种苯乙烯嵌段共聚物具有至少约30重量％的平均苯乙烯含量、不小于约20的平均MFR(200℃/5kg)、大于约15％的增塑剂以及增粘剂；其中热熔粘合剂组合物具有350℉下小于约15,000cps的粘度。
在一个方面，该弹性复合物包含在350℉下粘度小于约10,000cps的热熔粘合剂组合物。在另一方面，该一种或多种苯乙烯嵌段共聚物具有至少约35重量％的平均苯乙烯含量。在一个不同方面，该弹性复合物包含增粘剂含量为约25重量％至约40重量％的热熔粘合剂组合物。
在另一方面，该弹性复合物包括包含至少一种熔点小于100℃的增粘剂的热熔粘合剂组合物。
在一个方面，该弹性复合物包括非织造的第一基底和第二基底。在一个不同方面，该非织造材料为气流成网、梳理成网和水刺成网的。在另一方面，该非织造材料在幅材横向方向上可延展至大于100％。
在一个方面，使用选自槽式涂布和非接触涂布的施加方法将该弹性复合物的热熔粘合剂施加到基底。在一个不同方面，使用选自丝网印刷、喷涂、梳状垫片槽和凹版辊的施加方法将热熔粘合剂施加到基底。
在另一实施例中，本发明包括具有该弹性复合物的一次性制品。在一个方面，该弹性复合物用于选自耳状物、腰带、腹带和侧板的应用中。在另一方面，一次性制品选自尿布、成人失禁用品、妇女卫生用品和医用绷带。
在一个方面，本发明包括可用于形成粘结的弹性区域的热熔粘合剂组合物，该热熔粘合剂组合物包含约35重量％至约60重量％的一种或多种苯乙烯嵌段共聚物，其中该一种或多种苯乙烯嵌段共聚物具有至少约35％的平均苯乙烯含量和不小于约20的平均MFR(200℃/5kg)、大于约15％的增塑油以及增粘剂，其中该粘合剂组合物具有350℉下小于约15,000cps的粘度。
在一个实施例中，该热熔粘合剂组合物具有不大于约5的粘度比(300℉下的粘度(cps)/350℉下的粘度)。在另一个实施例中，增粘剂为芳香族含量为约5重量％至约20重量％的烃类树脂，并且增塑油为环烷油。
在另一方面，本发明包括可用于形成粘结的弹性区域的热熔粘合剂组合物，该热熔粘合剂组合物包含约40重量％至约55重量％的一种或多种苯乙烯嵌段共聚物，其中该一种或多种苯乙烯嵌段共聚物具有至少约35％的平均苯乙烯含量和不小于约20的平均MFR(200℃/5kg)、约15％至约30％的环烷增塑油以及约30重量％至约40重量％的芳香族改性烃类树脂，其中该粘合剂组合物具有350℉下小于约15,000cps的粘度。
在一个实施例中，该苯乙烯嵌段共聚物中的至少一者具有大于约30重量％的二嵌段含量。在另一个实施例中，该一种或多种苯乙烯嵌段共聚物的平均苯乙烯含量为至少约40重量％。在又一个实施例中，该一种或多种苯乙烯嵌段共聚物具有不小于约30的平均MFR(200℃/5kg)。
在另一方面，该弹性复合物包括基底和可用于形成粘结的弹性区域的热熔粘合剂组合物，该热熔粘合剂组合物包含约35重量％至约60重量％的一种或多种苯乙烯嵌段共聚物，其中该一种或多种苯乙烯嵌段共聚物具有至少约35％的平均苯乙烯含量和不小于约20的平均MFR(200℃/5kg)、大于约15％的增塑油以及增粘剂，其中该粘合剂组合物具有350℉下小于约15,000cps的粘度，并且其中该热熔粘合剂为粘结面积提供弹性。
具体实施方式
本申请人发现了可用于形成弹性复合物的热熔粘合剂组合物，该弹性复合物可用在一次性制品(例如，一次性吸收制品)中。该组合物具有良好的弹性回复率和高的剥离粘合力，并且具有350℉下小于约15,000cps的粘度。低粘度使得以较高的线速度施加热熔粘合剂并且只与需要弹性性能的那些区域对准(即提供区域化施加)成为可能。低粘度还使得在一次性制品生产线中施加热熔粘合剂成为可能。
弹性复合物
弹性复合物可包括第一基底和热熔粘合剂组合物。热熔粘合剂组合物赋予第一基底弹性。
作为另外一种选择，弹性复合物可包括第一基底、第二基底和热熔粘合剂组合物。热熔粘合剂组合物存在于第一基底和第二基底之间，将这两种基底永久地彼此粘结并在粘结面积提供弹性。
基底中的至少一者选自非织造材料和聚合物膜。
可使用任何非织造材料。非织造材料可为弹性非织造材料(例如，芯壳类)。非织造材料可包含由以下材料制成的纤维：一种或多种聚合物(例如，PET(聚对苯二甲酸乙二醇酯)、PBT(聚对苯二甲酸丁二醇酯)、尼龙、聚丙烯和聚乙烯)、一种或多种天然纤维(例如，人造丝纤维素、棉纤维素、大麻和粘胶纤维)或它们的组合。非织造材料可通过多种不同的方法(包括例如气流成网、湿法成网、纺粘或熔喷)形成。可使纤维梳理成网(例如，用梳子)，使得纤维以特定方向取向。这些纤网可以任何方式(包括例如水刺、化学粘合、针刺或热粘合)粘结在一起。在一个实施例中，非织造材料由气流成网、梳理成网和水刺成网的聚丙烯和聚乙烯纤维的共混物组成。
可使用任何聚合物膜。聚合物膜可选自聚乙烯、聚丙烯、聚乙烯共聚物、聚丙烯共聚物和PET。
第一基底和第二基底可为非织造材料。非织造材料可具有小于40克/平方米(gsm)、小于35gsm或甚至小于约30gsm的基重。非织造材料在幅材横向方向上可延展至大于100％。
各种后处理诸如用带槽轧辊处理(即活化)可用于调整复合物的机械特性(如延展性)。
可使用多种施加方法(包括槽式涂布、非接触涂布、梳状垫片涂布、喷涂(包括螺旋喷涂和随机喷涂)、丝网印刷、发泡(例如，使用化学发泡剂或Nordson
Figure BDA0001239696050000041
分配设备)、螺旋辊、凹辊、挤出和熔喷)将热熔粘合剂施加到第一基底和/或第二基底。
可将热熔粘合剂施加到一种基底。
作为另外一种选择，可将热熔粘合剂施加到第一基底，然后使热熔粘合剂接触第二基底以形成复合物。压力、张力和/或线速度可有助于形成粘结复合物。复合物可在一次性制品的制造过程中形成。作为另外一种选择，复合物在一次性制品的制造过程之前形成。
在一个实施例中，弹性复合物通过使用不连续施加方法施加热熔粘合剂形成。热熔粘合剂施加方法可选自梳状垫片涂布和喷涂。作为另外一种选择，任何其他涂布方法均可用于产生不连续涂层。在一个实施例中，在整个吸收制品上粘结弹性区域以竖条纹模式与不含粘合剂的区域交替。这些竖条纹可能更像细条纹。在一个实施例中，粘结弹性区域的条纹宽2至约10mm，不含粘合剂区域的条纹宽0.5至约5mm或甚至条纹宽0.5至约3mm。具有不含粘合剂的区域或使用热熔粘合剂不连续施加的方法来形成弹性复合物可利于为复合物提供透气性。
热熔粘合剂组合物
热熔粘合剂可为压敏粘合剂(即，在室温下具有一定粘性)。热熔粘合剂组合物可为浅色并且可具有良好的热稳定性。在冷却膜中，热熔粘合剂可为透光的(即半透明的)，或作为另外一种选择，热熔粘合剂可为不透明的。制造之后，热熔粘合剂可具有小于约3或甚至小于约2的初始熔融加德纳颜色(Molten Gardner Color)。作为另外一种选择，可将热熔粘合剂着色为不透明颜色，诸如粉色、蓝色、白色、灰色等。
热熔粘合剂组合物在施加温度下具有低粘度。该粘度可为约177℃(350℉)下不大于约15,000cps、约177℃(350℉)下不大于约10,000cps、约177℃(350℉)下不大于约7,500cps，或甚至177℃(350℉)下不大于约5,000cps。当根据2-峰滞后测试方法进行测试时，热熔粘合剂组合物在50％滞后之后产生不大于约20％、不大于约12％、不大于约10％或甚至不大于约8％的变形。
当根据剥离力测试方法进行测试时，热熔粘合剂组合物具有良好的粘合力。在一些实施例中，热熔粘合剂具有大于约100克/英寸、大于约200克/英寸或甚至大于约300克/英寸的剥离粘合力。
热熔粘合剂组合物包含一种或多种苯乙烯嵌段共聚物、增粘剂和大于约15重量％的增塑剂。
热熔粘合剂组合物可具有粘度比(149℃(300℉)下的粘度(cps)/177℃(350℉)下的粘度)不大于约7.5、不大于约6、不大于约5或甚至不大于约4的粘度曲线。低粘度比可表明在较高的线速度下具有改善的加工性，因为随着热熔粘合剂冷却，其粘度增长得越来越慢。
热熔粘合剂组合物可包含具有至少一部分芳香族含量和环烷油的增粘剂。
苯乙烯嵌段共聚物
热熔粘合剂包含一种或多种苯乙烯嵌段共聚物。
苯乙烯嵌段共聚物包括芳香族乙烯基聚合物嵌段和共轭双烯聚合物嵌段、氢化共轭双烯聚合物嵌段或它们的组合。这些嵌段可以多种构型(包括例如直链、支链、径向、星型嵌段以及它们的组合)排列。芳香族乙烯基聚合物嵌段可衍生自多种芳香族乙烯基化合物，包括例如苯乙烯、α-甲基苯乙烯、β-甲基苯乙烯、邻-、间-、对-甲基苯乙烯、叔丁基苯乙烯、2,4,6-三甲基苯乙烯、单氟苯乙烯、二氟苯乙烯、单氯苯乙烯、二氯苯乙烯、甲氧基苯乙烯、1,3-乙烯基萘、乙烯蒽、茚、苊烯以及它们的组合。双烯聚合物嵌段可衍生自多种含双烯化合物，包括例如异戊二烯、丁二烯、己二烯、2,3-二甲基-1,3-丁二烯、1,3-戊二烯和它们的氢化型式，以及它们的组合。
可用的苯乙烯嵌段共聚物包括例如二嵌段、三嵌段和多嵌段共聚物，包括例如苯乙烯-丁二烯、苯乙烯-丁二烯-苯乙烯、苯乙烯-异戊二烯、苯乙烯-异戊二烯-苯乙烯、苯乙烯-乙烯/丁烯、苯乙烯-乙烯/丁烯-苯乙烯、苯乙烯-乙烯/丙烯、苯乙烯-乙烯/丙烯-苯乙烯、苯乙烯-乙烯-乙烯/丙烯-苯乙烯、法呢烯苯乙烯和它们的组合，以及它们的氢化或官能化型式。
一种或多种苯乙烯嵌段共聚物具有至少约30重量％、至少约35重量％、至少约40重量％或甚至约35重量％至约45重量％的平均苯乙烯含量。
例如，如果热熔组合物包含两种苯乙烯嵌段共聚物A和B。聚合物A以25重量％存在，其中苯乙烯含量为35％；聚合物B以25重量％存在，其中苯乙烯含量为45重量％。则一种或多种苯乙烯嵌段共聚物的平均苯乙烯含量按照下列方式计算：0.5(35)+0.5(45)＝40重量％。
根据ASTM D 1238(200℃/5kg)并以dg/分钟计，一种或多种苯乙烯嵌段共聚物具有不小于约20dg/分钟、不小于约25dg/分钟或甚至不小于约30dg/分钟的平均熔融流动速率(MFR)。苯乙烯嵌段共聚物的平均MFR按照与计算平均苯乙烯含量类似的方式计算。
热熔粘合剂可包含至少一种苯乙烯嵌段共聚物，其中苯乙烯含量为至少约40重量％。
该组合物具有大于40重量％、大于45重量％、约35重量％至约60重量％或甚至约40重量％至约50重量％的总苯乙烯嵌段共聚物含量。
苯乙烯嵌段共聚物可为不含二嵌段的纯三嵌段共聚物。作为另外一种选择，苯乙烯嵌段共聚物可包含一部分二嵌段。苯乙烯嵌段共聚物可包含大于30％的二嵌段含量。
可用的苯乙烯嵌段共聚物包括：购自德克萨斯州休斯顿的台橡公司(TSRC Dexco,Houston,Texas)的VECTOR 6241(直链，苯乙烯-丁二烯-苯乙烯，纯三嵌段共聚物，43重量％苯乙烯，MFR(200℃/5kg)＝23dg/分钟)、VECTOR 8508(直链，苯乙烯-丁二烯-苯乙烯，纯三嵌段共聚物，29重量％苯乙烯，MFR(200℃/5kg)＝12dg/分钟)和VECTOR 4411(直链，苯乙烯-异戊二烯-苯乙烯，纯三嵌段共聚物，44重量％苯乙烯，MFR(200℃/5kg)＝40dg/分钟)，以及购自台湾台北的李长荣化学工业股份有限公司(LCY CHEMICAL CORP.,Taipei,Taiwan)的GLOBALPRENE 3545(直链，苯乙烯-丁二烯-苯乙烯嵌段共聚物，63％二嵌段，45重量％苯乙烯，MFR(190℃/5kg)＝55)。
增粘剂
热熔粘合剂包含增粘剂。增粘剂在室温下可为流体或固体。合适的增粘剂类别包括例如芳香族、脂肪族和环脂族烃类树脂、混合的芳香族和脂肪族改性烃类树脂、芳香族改性脂肪族烃类树脂以及它们的氢化型式；萜烯、改性萜烯，以及它们的氢化型式；天然松香、改性松香、松香酯，以及它们的氢化型式；低分子量聚乳酸；以及它们的组合。可用的天然和改性松香的例子包括脂松香、木松香、妥尔油松香、蒸馏松香、氢化松香、二聚松香和聚合松香。可用的松香酯的例子包括例如浅色木松香的甘油酯、氢化松香的甘油酯、聚合松香的甘油酯、天然和改性松香的季戊四醇酯，包括浅色木松香的季戊四醇酯、氢化松香的季戊四醇酯、妥尔油松香的季戊四醇酯和松香的酚改性季戊四醇酯。
可用的增粘剂可以多种商品名商购获得，包括例如来自德克萨斯州休斯顿的埃克森美孚化工公司(Exxon Mobil Chemical Company,Houston,Texas)的商品名ESCOREZ系列，包括ESCOREZ 5400(芳香族含量为1％)、ESCOREZ 5600(芳香族含量为9.8％)、ESCOREZ5690(芳香族含量为10％)和ESCOREZ 5615(芳香族含量为9.9％)；来自田纳西州金斯波特的伊士曼化工公司(Eastman Chemical,Kingsport,Tennessee)的商品名EASTOTAC系列，包括EASTOTAC H-100R和EASTOTAC H-100L；来自宾夕法尼亚州艾斯顿的克雷威利碳烃特殊化学品公司(Cray Valley HSC,Exton,Pennsylvania)的商品名WINGTACK系列，包括WINGTACK86、WINGTACK EXTRA和WINGTACK 95；以及来自田纳西州金斯波特的伊士曼化工公司(Eastman Chemical Company,Kingsport,Tennessee)的商品名PICCOTAC和KRISTALEX系列，包括例如PICCOTAC 8095和KRISTALEX 3100。
热熔粘合剂可不含熔点大于约110℃、大于约120℃或甚至大于约130℃的末端嵌段树脂。
热熔粘合剂组合物可包含具有一定芳香族含量的至少一种增粘剂。增粘剂可具有大于5重量％、大于20重量％、大于50重量％、约5重量％至约20重量％或甚至约7.5重量％至约15重量％的芳香族含量。利用核磁共振(NMR)光谱测量芳香族含量。
该组合物可包含熔点小于100℃或甚至小于95℃的增粘剂。
热熔粘合剂组合物可包含至少约20重量％、至少约25重量％、约10重量％至约50重量％、约15重量％至约40重量％或甚至约20重量％至约37重量％的增粘剂。
增塑剂
热熔粘合剂组合物包含增塑剂。合适的增塑剂包括例如环烷油、石蜡油(例如，环烷烃油)、矿物油、邻苯二甲酸酯、己二酸酯、烯烃低聚物(例如，聚丙烯、聚丁烯和氢化聚异戊二烯的低聚物)、聚丁烯、聚异戊二烯、氢化聚异戊二烯、聚丁二烯、苯甲酸酯、动物油、植物油(例如，蓖麻油、大豆油如高油酸豆油)、油的衍生物、脂肪酸的甘油酯、聚酯、聚醚、乳酸衍生物以及它们的组合。
可用的市售增塑剂包括购自印第安纳州印第安纳波利斯的卡路美特殊产品合伙人公司(Calumet Specialty Products Partners,LP,Indianapolis,Indiana)的CALSOL550环烷油、购自纽约州柏油村的索诺邦公司(Sonneborn,Tarrytown New York)的KAYDOLOIL矿物油、购自德克萨斯州休斯顿的埃克森美孚化工公司(Exxon Mobil ChemicalCompany,Houston,Texas)的PARAPOL聚丁烯、购自德国路德维希港的巴斯夫公司(BASF,Ludwigsjhafen,Germany)的OPPANOL聚异丁烯、购自英国萨里郡的Petrochem Carless公司(Petrochem Carless Limited,Surrey,England)的KRYSTOL 550矿物油、购自安大略省密西沙加的加拿大石油润滑剂公司(Petro Canada Lubricants Inc.,Mississauga,Ontario)的PURETOL 35和15两种矿物油以及购自杜邦先锋公司(Pioneer Dupont)的PLENISH。
增塑剂可为环烷油。作为另外一种选择，增塑剂包含芳香基团或环烷基团。
增塑剂以至少约15重量％、至少约18重量％、约10重量％至约30重量％或甚至约15重量％至约25重量％的量存在于热熔粘合剂组合物中。
蜡
热熔粘合剂组合物可包含蜡。可用的蜡类别包括例如石蜡、微晶蜡、高密度低分子量聚乙烯蜡、副产物聚乙烯蜡、聚丙烯蜡、费托蜡、氧化费托蜡、官能化蜡诸如酸、酸酐和羟基改性的蜡、动物蜡、植物蜡(例如，大豆蜡)以及它们的组合。可用的蜡在室温下为固体并且优选地具有50℃至170℃的环球软化点。可用的蜡可商购自多个供应商，包括来自德克萨斯州休斯敦的维斯特莱克化学公司(Westlake Chemical Corporation,Houston,Texas)的商品名EPOLENE N和C系列，包括例如EPOLENE N-21；以及来自瑞士穆顿兹的科莱恩国际公司(Clariant International Ltd.,Muttenz,Switzerland)的商品名LICOCENE系列，例如TP LICOCENE PP 6102。
热熔粘合剂组合物可包含不大于约8.0重量％、不大于约5重量％、约1重量％至约7.5重量％、或甚至约1重量％至约5重量％的蜡。
附加组分
热熔粘合剂组合物任选包含附加组分，包括但不限于例如发泡剂、稳定剂、抗氧化剂、附加聚合物(例如，烯烃类聚合物(如丙烯均聚物、丙烯共聚物、乙烯均聚物、乙烯共聚物等)、官能化聚合物(如酸、酸酐和羟基改性聚合物)、无定形聚α烯烃)、粘合促进剂、紫外光稳定剂、腐蚀抑制剂、气味吸收剂/中和剂、着色剂(例如，颜料(如，二氧化钛、炭黑以及它们的混合物)和染料)、芳香剂、填充剂(例如，纳米颗粒、碳酸钙、粘土、滑石、热解法二氧化硅)、表面活性剂、湿度指示剂、超吸收物、挤出涂层、加工助剂以及它们的组合。
热熔粘合剂可包含约0.05重量％至约2.0重量％的颜料，或甚至约0.05重量％至约0.5重量％的颜料。
可用的抗氧化剂包括例如季戊四醇四[3,(3,5-二叔丁基-4-羟基苯基)丙酸酯]、2,2'-亚甲基双(4-甲基-6-叔丁基苯酚)、亚磷酸盐(包括例如三-(对-壬基苯基)-亚磷酸盐(TNPP)和双(2,4-二-叔丁基苯基)4,4'-二亚苯基-二膦酸盐)、二-硬脂基-3,3'-硫代二丙酸酯(DSTDP)以及它们的组合。可用的抗氧化剂可以多种商品名商购获得，包括例如商品名IRGANOX系列，包括例如IRGANOX 1010、IRGANOX 565和IRGANOX 1076受阻酚抗氧化剂和IRGAFOS 168亚磷酸盐抗氧化剂(这些抗氧化剂均可购自新泽西州弗洛勒姆帕克的巴斯夫公司(BASF Corporation,Florham Park,New Jersey))，以及ETHYL 702 4,4'-亚甲基双(2,6-二叔丁基苯酚)。当存在抗氧化剂时，热熔粘合剂组合物优选包含约0.1重量％至约2重量％的抗氧化剂。
一次性制品
本发明的热熔粘合剂组合物和弹性复合物可掺入到任何合适的制品中，这些制品包括个人护理衣物、医用衣服和工业工作服。
本发明的弹性复合物可用于多种应用和结构中以改善舒适度和贴合性，所述多种应用和结构包括例如一次性吸收制品，包括例如尿布、训练裤、泳装、吸收内裤、成人失禁用品、卫生巾、医用敷料(例如，伤口护理产品和绷带)、手术垫、医用长袍、帽子、手套、手术单、面罩、实验服、连衣工作服、肉类包装产品以及吸收制品的部件，包括例如吸收元件、吸收芯材、防渗层(例如，背片)、薄纸(例如，包装薄纸)、集液层以及织造和非织造幅材层(例如，被套、吸收薄纸)。
本发明的弹性复合物可用于使一次性制品的许多区域具有弹性，这些一次性制品包括腿箍、腰部物(waist portions)、腹带和侧板和紧固片/耳状物。本发明的弹性复合物还可用于使一次性制品的任何部分、一次性制品的一部分或多部分或甚至整个一次性制品具有弹性。
实例
表中的组合物量均以重量％计。
测试程序
除非另外指明，否则用于实例和整篇说明书的测试程序包括以下程序。
粘度测试方法
根据标题为“Standard Test Method for Apparent viscosity of Adhesivesand Coating Materials(粘合剂和涂布材料表观粘度的标准测试方法)”(1988年10月31日)的ASTM D-3236，使用美国博勒飞公司的RVDV 2型Thermosel粘度计(BrookfieldThermosel viscometer Model RVDV 2)和27号转子来测定粘度。结果以厘泊(cps)记录。
熔融加德纳颜色
测试热熔粘合剂(在熔融态中)，通过相对于ASTM D-1544中所述的熔融加德纳颜色标准比较样品的颜色来确定熔融加德纳颜色。该比较使用可得自马里兰州贝塞斯达的太平洋科学公司(Pacific Scientific,Bethesda,Maryland)的装配了照明设备的GardnerDelta比较仪进行。
测试层合结构制备
在177℃(350℉)的施加温度、10.5牛顿/厘米(N/cms)(6磅/线性英寸(PLI))的辊隙压力和至少6.1米/分钟(m/min)(20英尺/分钟)的运行速度下，通过在两种非织造*基底之间连续槽式涂布弹性热熔粘合剂组合物来制备测试层合结构。所制备的层合结构中粘合剂涂层重量为100克/平方米(gsm)，粘合剂宽度为至少7.6cm(3英寸)。制备了足够量的层合物，使得至少能够收集1.5m(60英寸)的代表性层合结构用于测试。
*所用的非织造材料经梳理成网、水刺成网，并且包含50/50(PET/PP)。其具有29g/m2的基重、93克/厘米2(600克/英寸2)的横向拉伸强度、CD断裂伸长率＝
剥离力测试方法
根据上述测试层合结构制备方法，通过在两种基底之间涂布粘合剂来制备测试层合物。利用标题为“Test Method for Determining Peel Resistance of Adhesive(T-Peel Test Method)(用于确定粘合剂抗剥离性的测试方法(T-剥离测试方法))”的ASTMD1876-01测定剥离力，不同之处在于测试在10秒内以每分钟30.5cm(12英寸/分钟)而不是每分钟25.4cm(10英寸/分钟)的速率运行，并且重复运行7次而不是在ASTM D1876中所规定的10次。在INSTRON型测试仪器上运行样品。测试样品的宽度为2.54cm(1英寸)，长度为至少10.16cm(4英寸)。记录10秒内剥离的平均剥离力，结果以克记录。在制备层合物至少24小时之后，测量初始剥离力。
2-峰滞后测试方法
根据上述测试层合结构制备方法，通过在两种基底之间涂布热熔粘合剂来制备测试层合物。通过沿幅材横向方向将层合物切割成宽度为1英寸、长度为至少3英寸，制备测试样品。在制备非织造层合物至少24小时之后进行测试。
将制备的样品条延展至某一张力(例如，50％、100％、150％或200％)，然后回缩至其原有尺度。随后使样品经受具有相同变形的第二次延伸-回缩循环。将十字头速度设定为每分钟50.8cm(20英寸/分钟)。延伸和回缩之间没有停留时间。在INSTRON型测试仪器上运行样品，至少重复3次。根据在拉伸应力降至5克力时回缩曲线上的拉伸应变确定每次循环之后的永久变形。同样记录最大变形处的峰值载荷/应力以及每次循环之间的能量损失百分比。
流变蠕变和回复
使用具有8mm板的平行板几何形状在Texas Instruments AR-G2流变仪上进行流变蠕变和回复。该测试在38℃下恒温运行，其中间隙为300μm。
一经在38℃下达到平衡后，就施加26,800Pa的压力。将样品在此压力下保持20分钟(测试的蠕变部分)。然后将压力释放至0Pa，保持20分钟(测试的回复部分)。
测量张力。在表中记录特定间隔处的值。
表一
比较例1和2是本发明范围之外的组合物(比较例1具有小于15％的增塑剂，比较例2具有平均MFR为12dg/分钟的苯乙烯嵌段共聚物。两者在350℉下的粘度均大于15,000cps)。预计两者用于高速生产线的效果不好。
Figure BDA0001239696050000121
表二
Figure BDA0001239696050000131
Figure BDA0001239696050000141
表三
Figure BDA0001239696050000142
表四
Figure BDA0001239696050000143
Figure BDA0001239696050000151

Claims (11)

1.一种弹性复合物，包含：
第一基底和第二基底；以及
所述第一基底和所述第二基底之间的热熔粘合剂组合物，由此将所述第一基底和第二基底永久地彼此粘结并在所粘结面积中提供弹性，所述热熔粘合剂组合物包含：
35重量％至60重量％的一种或多种苯乙烯嵌段共聚物，其中所述一种或多种苯乙烯嵌段共聚物具有至少30重量％的平均苯乙烯含量、不小于20的在200℃/5kg下测得的平均MFR、
大于15％的增塑剂以及，
增粘剂；
其中所述热熔粘合剂组合物具有177℃(350℉)下小于15,000cps的粘度，并且
其中所述热熔粘合剂组合物不发泡。
2.根据权利要求1所述的弹性复合物，其中所述一种或多种苯乙烯嵌段共聚物具有至少35重量％的平均苯乙烯含量。
3.根据权利要求1所述的弹性复合物，其中所述热熔粘合剂组合物包含至少一种熔点小于100℃的增粘剂。
4.根据权利要求1所述的弹性复合物，其中所述第一基底和第二基底为非织造材料。
5.根据权利要求4所述的弹性复合物，其中所述非织造材料为气流成网、梳理成网和水刺成网的。
6.根据权利要求4所述的弹性复合物，其中所述非织造材料在幅材横向方向上可延展至大于100％。
7.根据权利要求1所述的弹性复合物，其中增粘剂是芳香族含量为5重量％至20重量％的环脂族烃类树脂，增塑剂是环烷油。
8.一种包含权利要求1所述的弹性复合物的一次性制品。
9.根据权利要求8所述的一次性制品，其中所述弹性复合物用于选自耳状物、腰带、腹带和侧板的应用中。
10.一种可用于形成粘结的弹性区域的热熔粘合剂组合物，包含：
35重量％至60重量％的一种或多种苯乙烯嵌段共聚物，其中所述一种或多种苯乙烯嵌段共聚物具有至少35％的平均苯乙烯含量、不小于20的在200℃/5kg下测得的平均MFR，
大于15％的增塑油以及，
增粘剂，
其中所述粘合剂组合物具有177℃(350℉)下小于15,000cps的粘度，
其中所述热熔粘合剂组合物不发泡。
11.根据权利要求10所述的热熔粘合剂组合物，其中所述增粘剂为芳香族含量为5重量％至20重量％的烃类树脂，并且所述增塑油为环烷油。
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