CN1256231C - 制备多层共挤塑物的方法和由该方法制备的共挤塑物 - Google Patents

制备多层共挤塑物的方法和由该方法制备的共挤塑物 Download PDF

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CN1256231C
CN1256231C CNB998125784A CN99812578A CN1256231C CN 1256231 C CN1256231 C CN 1256231C CN B998125784 A CNB998125784 A CN B998125784A CN 99812578 A CN99812578 A CN 99812578A CN 1256231 C CN1256231 C CN 1256231C
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CN1331735A (zh
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瓦尔特·冈特
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Germany Huta Soft Packaging Co.,Ltd. Huw Tama Ki Phu F Haim branch
Germany: Hu tower Film Co.,Ltd.
Germany: Huta Soft Packaging Co.,Ltd.
Hussein Faye Ana Germany GmbH & Co.KG
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Abstract

一种制备多层共挤塑物的方法，所述多层共挤塑物包含具有粘合剂释放特性的塑料层，产生所述释放特性的材料被置于塑料层内。该方法包括在制备共挤塑物的过程中，在粘合剂层(3、23)的一侧设置第一料片(2、22)，然后设置具有释放特性的塑料层(4、24)，再将该塑料层粘结到第二料片(5、25)上。多层共挤塑物的特征在于以下事实：提供至少两个塑料膜(2、5；22、25)，使粘合剂层(3、23)和具有粘合剂释放特性的另一层(4、24)位于所述的两个塑料膜之间。

Description

制备多层共挤塑物的方法和由该方法制备的共挤塑物
本发明涉及带有塑料层的多层共挤塑物的制备方法，所述塑料层对于粘合剂具有释放特性，产生该释放特性的物质位于所述的塑料层中。
本发明的目的是说明上文概述的一种可有效地制备由一料片、粘合剂、释放层和用于该释放层的另一料片组成的复合材料的方法。
在本发明所建议的该问题的解决方案中，在生产共挤塑物时在放置粘合剂层的那一侧设置第一料片，然后设置具有释放特性的塑料层，后者再与第二料片粘结。
通过这种共挤塑法，至少所述复合材料的基本结构在单一操作中得以制造。
已经证明，如果按照本发明进一步的改进，将所述共挤塑物的各层同时共挤塑，将是特别有利的。
结果是实现了整个层结构的特别有效的生产。
在本发明的特别有益的改进中，通过吹膜法同时挤塑各层。
然而，根据本发明的进一步的改进，通过流延法制备各层也是可能的。
根据本发明的进一步的改进，可以提供基材作为第一料片或第二料片，其中其他各层在单一操作中被挤压到所述基材上。
当所用的料片是难以或不可能与其他所有可被施加到其上的各层在单一操作中同时挤塑的时候(所述料片在单一操作中作为基材发挥作用)，这一方法是特别有利的。
根据本发明的进一步的改进，将塑料膜作为基材提供也是非常有益的，其他各层在单一操作中被挤压到所述塑料膜上。
本发明的进一步的改进的特征在于至少所述的基材是被定向的这一事实。
结果，所得共挤塑物具有适宜的强度特性。
根据本发明的有利的改进，还可将整个共挤塑物定向。
在这种情况下，可被定向的所有层有助于提高共挤塑物的强度特性。
根据本发明的一个有利的改进，多层共挤塑物具有至少两个塑料膜，而粘合剂层和具有粘合剂释放特性的另一层位于所述两个塑料膜之间。
根据本发明的另一有利的改进，在所述塑料膜的任一侧或两侧设置另外的层。
已经证明，如果根据本发明的再进一步的改进，将共挤塑物的至少一部分定向是非常有利的。
本发明通过将基材或共挤塑物成品定向，在强度方面获得了相当大的提高。
本发明的两个实施方案显示在附图中。
图1是显示由四层组成的复合材料的结构的简图；
图2是显示由五层组成的复合材料的简图。
在图1中数字1代表由四层组成的并由所述共挤塑法制备的复合材料。在第一料片2的一侧设置有粘合剂层3，紧接其上是具有释放粘合剂特性的另一层4。该释放层4又被粘结到第二料片5上。如果料片2和料片5都是由可共挤塑的塑料制造的，所有的四层可同时制备，不仅可通过吹膜法也可通过流延法。然而，在该共挤塑法完成后，还可用另外的层覆盖料片2和料片5。
由五层组成的另一复合材料21显示在图2中，其中料片22作为释放层24的基材使用。该释放层24的另一侧是粘合剂层23，后者又被粘结到由塑料制成的料片25上。该料片25作为核芯层，在远离粘合剂层23的那一侧为表层26。这种表层也可作为上述释放层的表层而设置在料片22上。
不同的塑料可作为释放层的基材层而使用。
本发明中，在各种情况下，使用例如20-40μm厚的LDPE、LLDPE、HDPE、PP、mPE、PETP和PS，同时使释放层的实际厚度为5到10μm，取得了好的特性。
PP、OPP、PE、LDPE、LLDPE、mPE、PS和PET已被成功地用于承载粘合剂的所述料片，根据所用的这些材料，其厚度在60～200μm之间。在某些情况下，在所述料片的外侧还设置了另外的涂层以改善印刷性。
在某些情况下，所述料片还被分成了由不同的材料制造的几层。
可挤塑的、永粘性的、基于热熔物和带有适当粘性化填加剂的聚烯烃的粘合剂已被成功地用做了粘合剂。
实施例1
使用SIS、SBS、SEBS和SEP的嵌段共聚物，其在200℃和5kg下的融熔指数为8-65g/10分钟。聚合物的苯乙烯含量在10-35％之间。可通过加入树脂和增塑剂而将粘合剂层的特性加以控制，例如借助于脂族烃树脂、多萜烯树脂、被水解的烃树脂、芳族烃树脂、石腊、微晶腊、聚异丁烯和加工油。
通过首先进行化合操作，将液体组分加工成可挤塑的形式。
挤塑时的温度在100-240℃之间，同时，避免剪切力过高。
实施例2
制备粘合剂层的其它方法包括采用熔融转移技术将UV丙烯酸酯或UV熟化的PSA包含在共挤塑的基材和释放层之间。
由辐射熟化的基本材料是，例如含有整合在其中的光引发剂的丙烯酸酯共聚物。UV交联由用于粘合剂的聚合物基材层完成。
可用树脂或增塑剂将丙烯酸酯共聚物改性，同时粘合剂层的粘性可通过辐射剂量加以控制。
实现交联目的的典型的辐射波长为250-260纳米(UVC)。
丙烯酸酯共聚物的典型加工温度为110-150℃之间。
如果所用的基材是通过共挤塑法被涂敷的基材，为提高强度特性，不仅可对该基材本身进行定向，还可对共挤塑物成品进行定向。
如果整个的结构作为共挤塑物而制备，也可接下来对该共挤塑物进行定向以提高强度特性。

Claims (11)

1.制备多层共挤塑物的方法，所述多层共挤塑物具有塑料层，该层具有释放粘合剂的释放特性，其中产生释放特性的材料位于塑料层内，该方法的特征在于：
在制备共挤塑物的过程中，在粘合剂层(3、23)的一侧设置第一料片(2、22)，然后设置具有释放特性的塑料层(4、24)，再将该塑料层粘结到第二料片(5、25)上；
其中共挤塑物的各层是同时被挤塑的；且
设置另外的层(26)，其位于并粘结到塑料片膜(2、5或22、25)的两侧，从而两个塑料片膜均设置有与塑料膜粘合的另外的层(26)。
2.根据权利要求1的方法，其中共挤塑物的各层是同时被挤塑的。
3.根据权利要求1或2的方法，其中通过吹膜法将各层同时挤塑。
4.根据权利要求1或2的方法，其中通过流延法将各层同时挤塑。
5.根据权利要求1或2的方法，其中提供基材料片(2、5；22、25)作为第一料片或第二料片，将其他各层在单一操作中挤压到所述基材上。
6.根据权利要求1的方法，其中提供塑料膜作为基材料片(2、5；22、25)，将其他各层在单一操作中挤压到所述塑料膜上。
7.根据权利要求1或2的方法，其中至少将所述的基材定向。
8.根据权利要求7的方法，其中将整个共挤塑物进行定向。
9.由按照前述任一项权利要求所述的方法制备的多层共挤塑物，其特征在于，提供至少两个塑料膜(2、5；22、25)，粘合剂层(3、23)和具有粘合剂释放特性的释放层(4、24)位于所述的两个塑料膜之间。
10.根据权利要求9的多层共挤塑物，其中在所述塑料膜的任一侧或两侧设置有另外的表层(26)。
11.根据权利要求9或10的多层共挤塑物，其中该共挤塑物的至少一部分是被定向的。
CNB998125784A 1998-11-06 1999-11-03 制备多层共挤塑物的方法和由该方法制备的共挤塑物 Expired - Fee Related CN1256231C (zh)

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