CN1968869A - 用于包装液体或其它类似物的薄膜及制造这种薄膜的方法 - Google Patents

用于包装液体或其它类似物的薄膜及制造这种薄膜的方法 Download PDF

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CN1968869A
CN1968869A CNA2003801109919A CN200380110991A CN1968869A CN 1968869 A CN1968869 A CN 1968869A CN A2003801109919 A CNA2003801109919 A CN A2003801109919A CN 200380110991 A CN200380110991 A CN 200380110991A CN 1968869 A CN1968869 A CN 1968869A
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J·W·德克莱尔
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Technyl - Praxair European Ltd By Share Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/28Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00Use of polyalkenes or derivatives thereof as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/412Transparent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00Packaging equipment or accessories not otherwise provided for
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/26Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/269Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension including synthetic resin or polymer layer or component
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/3154Of fluorinated addition polymer from unsaturated monomers
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/3154Of fluorinated addition polymer from unsaturated monomers
    • Y10T428/31544Addition polymer is perhalogenated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/31935Ester, halide or nitrile of addition polymer
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31855Of addition polymer from unsaturated monomers
    • Y10T428/31938Polymer of monoethylenically unsaturated hydrocarbon

Abstract

一种用于包装液体产品或其它类似物的薄膜,其主要由第一聚烯烃层、接合层和聚三氟氯乙烯(PCTFE)层构成,其特征在于,PCTFE层(3)具有至少10微米(μm)的厚度,由此,通过挤压成层获得所述薄膜(1)。

Description

用于包装液体或其它类似物的薄膜及制造这种薄膜的方法
技术领域
本发明涉及一种用于包装液体产品或其它类似物的薄膜,特别是用于包装液体状的、半液体状的、溶解状的、凝胶状的、乳化状的或其它类似状态的药物和/或化妆产品。
背景技术
在医药领域和化妆品工业中,就透明度而言,对于外部做包装的材料的要求很高,如化学和生物化学活性、吸收力、渗透性等。
当包装中存有液体或其它类似物,而其可能包含这类大量组分,例如极性成分、非极性成分、离子、盐类、油类、表面活性成分、抗菌成分、大分子物等时,这些要求就更高。
虽然,在上述领域,合成包装已经被用于贮存固体原料,但是由于有太高的渗透性、太大的活性、太大的吸收力或其它类似情况,这些包装无法满足贮存液体产品的要求。
迄今为止,医药工业主要使用玻璃包装,因为玻璃是用来贮存这类产品的合适容器,但是玻璃包装也有重大缺点。
例如,象玻璃安瓿是人们知道的,其中贮存一个剂量将被注射的药品或其它类似物,使用之前在安瓿颈部的缩小处,可以将安瓿的顶端折断。
这些已知的玻璃安瓿的不利之处在于,它们易碎且需要小心包装;此外,折断安瓿的顶部并不简单,使用者本身会被玻璃所伤。应当注意到,在折断安瓿的顶部时,极小的玻璃颗粒可能最后留在安瓿的内容物中,这至少是不期望的。
通常,玻璃安瓿和玻璃包装的另一个缺陷是它们不能变形,其结果是它们难于叠放或根本不能不浪费空间地叠放。
不能变形的玻璃包装的另一个缺陷是,在很多情况下,残余的液体将粘附在玻璃内壁,其结果是,当下药使用精确的确定剂量时,可能发生少量偏差。
玻璃包装的不可变形特性的另一个缺陷是,难于使产品以恒定流率流出玻璃包装,例如当医药产品必须以连续流率下药需要另外的泵系统时。
另外,用来贮存注射产品的玻璃小瓶是人们知道的。这些小瓶通过橡皮帽气密封接,该橡皮帽通过例如由铝制成的盖子固定在玻璃上。
将要注射的剂量由设在小瓶内的活塞下药,由此,小瓶的内容物被引导通过内部设有硅层的细管。
虽然这些小瓶使得给出恰当剂量的药品或其它类似物成为可能,但是其构造复杂并且其生产相对昂贵,特别是当小瓶的不同部分需要灭菌时。
此外,在上述管中应用的硅是不希望有的,因为硅可能影响贮存在小瓶中的药品或其它类似物的成分,而对服药的患者带来可能有害的后果。
为了补救上述几个缺点,已经知道薄膜能够用来包装液态或其它类似状态药物或化妆品。但是这些不同的已知薄膜都有特定的主要缺点。
这就是,已经知道PVC(聚氯乙烯)制造的薄膜具有很难或不溶于水的成分,这种被称为非极性组分的物质从所贮存产品吸出进入PVC,其结果是所贮存产品中的这些非极性组分的浓度随时间而降低,因而产品可能丧失其有效特性。
其它的已知薄膜,例如由PE(聚乙烯)、PP(聚丙烯)、聚-1-丁烯(PB)或其它类似物制造的薄膜,又对例如象石腊油之类的某些油可以渗透,当这种包装用于这种油时,该包装将在例如几天后感觉油滑,这会导致不可接受的油损失;还有某些表面活性组分,例如十二烷,会特别迅速地转移穿过PE薄膜或其它类似物。
还有其它的已知薄膜,例如由丙烯腈-甲基丙烯酸酯共聚物制造的薄膜不能用于贮存具有各式各样组分的产品,因为这类薄膜似乎对例如过氧化物衍生物的高反应性没有抵抗力(过氧化物衍生物由于它们的漂白性能而被用于化妆品中),并且因为这类薄膜对水分没有足够的抗渗透性。
最后,还有多层薄膜。
这样的薄膜已知为具有由丙烯腈-甲基丙烯酸酯(A/MA/B)制造的内层,接着是接合层,PCTFE(聚三氟氯乙烯)共聚物层与其粘接。
这些已知薄膜的缺点在于,A/MA/B在通过辐射灭菌的过程中会褪色,其结果是,根据这种薄膜包装的内容物在最后使用时将无法清楚地看到,因此在贮存的产品下药时,可能存在例如大分子沉淀不能用肉眼检测出来。
在另一个已知的PCTFE薄膜中,内层由乙烯丙烯酸(EAA)构成,EAA的缺点在于,它对某些极性和脂肪族成分是可以反应的,因此所述成分不能贮存在这种薄膜中,使其成分在一段时间内不发生改变。
在另一个PCTFE膜中,使用了厚度为7.5μm(微米)用PCTFE共聚物制成的薄膜,其被接合层限定在包装的内侧,其上设有PE层。
这种已知薄膜的缺点在于,试验证明PCTFE共聚物的PCTFE薄膜比PCTFE均聚物制成的薄膜能让更多水蒸气透过。另外,厚度为7.5μm的PCTFE聚合物薄膜层透过水蒸气相当迅速,因此由于水分透过包装蒸发,贮存在该包装中的产品的某些成分的浓度可能增加。
所述用语均聚物在此处的意思是相同分子链组成的聚合物,在这种情况下,三氟氯乙烯除了末端分子以外所有分子都以相同方式共价连接。
发明内容
本发明系指一种包装,其对上述的和其它的缺点提供解决方法。
为此目的,本发明涉及一种用于液体产品或其它类似物的包装,其主要由第一聚烯烃层,接合层和聚三氟氯乙烯(PCTFE)层构成,其中PCTFE层具有至少10微米(μm)的厚度,并且通过挤压成层或共挤压成层获得薄膜。
所述术语聚烯烃在此处理解为主要由碳原子和氢原子构成的聚合物,例如聚乙烯、聚丙烯、1-丁烯、4-甲基戊烷等。
PCTFE层优选地由PCTFE均聚物制成。
PCTFE均聚物层优选地也具有至少50μm的厚度。
这种薄膜的一个优点是,其对液态或其它类似状态的产品,还有气态产品的相对不渗透性,这部分是由于PCTFE层的厚度以及应用PCTFE均聚物的结果。
另一个优点是,依据本发明的薄膜是透明的,并且在电离辐射的作用下不褪色,在其它包装材料中所述电离辐射通常用于灭菌,所述薄膜还有一附加效果是其在通过辐射灭菌后保持最理想的透明状态,因此,包装在所述薄膜内的产品的质量总是能够用肉眼检验。
优选地,所述接合层也由共聚物构成,该共聚物以聚烯烃和甲基丙烯酸缩水甘油酯(glycidyl methacrylate)制成,例如乙烯甲基丙烯酸缩水甘油酯共聚物(EGMA),其提供的优势在于,所述接合层几乎不会受包装产品的迁移组分的影响,因此薄膜层的复合体不会破裂。
由此获得的薄膜复合物的优点是,所用材料在它们处于在薄膜中的状态时,化学上几乎是惰性的并且吸收相当少量的组分或者根本不吸收。
与此相关联的优点是,包装产品的成分随时间变化很小,这归功于依据本发明的包装薄膜的惰性和从该薄膜所能获得的良好密封性,其结果是包装产品将有更长的存放期。
除了用于包装液体产品或其它类似物的薄膜外,本发明的目的还在于一种使制造这种薄膜成为可能的方法。
迄今为止,还不知道有用于制造如上所述具有较大厚度的PCTFE薄膜的方法。
为此目的,本发明涉及一种方法,其能够用于制造如前述权利要求中任何一项所述的薄膜,由此,挤压接合层,其特征在于,接合层和上述PCTFE薄片与聚烯烃层一起在第一辊和第二辊之间进行挤压,由此PCTFE薄片被层压到接合层上。
依据本发明方法的一个优点是,通过以层压手段将接合层与PCTFE薄片粘合,无论何种厚度的PCTFE薄片都能使用。
与挤压成层的应用相关联的另一个优点是,在制造薄膜时,接合层、PCTFE以及可能所用的聚烯烃之间的粘度差别不必予以考虑,因为这些物质可能在不同的时刻被挤压,因此众多种类的聚烯烃可以被应用,同样也有众多种类的物质可以被用作接合层。
附图说明
为了更好地说明本发明的特点,将用于包装液体产品或其它类似物的依据本发明薄膜的下述优选实施例,还有用于制造上述薄膜的依据本发明方法的一些优选实施例仅以一个示例进行描述,该示例没有任何限定,带有附图作为参考,其中:
图1是剖面图,示意性表示依据本发明的薄膜;
图2表示用于制造依据本发明的薄膜的方法;
图3表示图2的一种变型。
具体实施方式
图1表示用于包装液体产品或其它类似物的依据本发明的薄膜1,其主要由第一层2和PCTFE层3构成,中间设有接合层4。
第一层2(该层被特别设计成包装中内容物的接触层)由透明的、不腿色的并且惰性的合成层构成,在这种情况下,其由例如PE、PP和/或PB的聚烯烃构成。
第一层2的厚度可在5μm和大约1000μm之间变化,优选厚度约为20到50μm。
PCTFE层3优选地由PCTFE均聚物构成,并且具有至少10μm的厚度,优选的是至少50μm。
就象第一层2那样,接合层4由透明的并且不腿色合成材料构成,例如乙烯和甲基丙烯酸缩水甘油酯的共聚物,其具有3到50μm的厚度,或优选的是3到10μm的厚度。
这样的薄膜1特别适合用于包装液态或其它类似状态的医药或化妆产品,所述产品可能含有各式各样的组分,包括例如油类,如石腊油;大分子溶液,如蛋白质等。
因为PE、PP和/或PB优选地被用作第一层2,其合成材料可以例如在热的作用下被焊接,包装能以简单方式被快速密封。
因此,薄膜1可被用作例如小袋形状的包装或替代玻璃安瓿,用于任何上述的成分。
当然,完全可以在薄膜1的外侧,特别是在PCTFE层3上覆盖其它层,例如刚性合成层,以加强薄膜1,或者覆盖其它功能性覆盖物。
在PCTFE层3的外侧,再次设置接合层4和聚烯烃层2来制造对称的薄膜也是可能的,这样就产生能够双面使用的薄膜1。
在薄膜1的内侧,特别是在聚烯烃层2上,设置额外的功能层也是可能的,例如由PE或其它类似物的三聚物制成的层,其可能使薄膜1更好地焊接到自身或为薄膜1提供另外的焊接强度。
另外,应当注意到,接合层4不仅可以应用EGMA共聚物,其它物质或多种物质的组合也可以应用,是否采用取决于设计薄膜1的目的。
其它可能的接合层由例如乙烯-甲基丙烯酸酯-甲基丙烯酸缩水甘油酯三聚物;乙烯-丙烯酸酯共聚物;乙烯三聚物;酯丙烯基团和甲基丙烯酸缩水甘油酯;以及其它物质构成,也包括双层的或多层的接合层。
上述薄膜1可以通过装置5及其后所述方法,以简单方式制造。
用于制造依据本发明的薄膜1的装置5在图2中示出,其主要由挤压装置6和彼此相对设置的两个辊7和8构成,其中在所述两个辊之间设有纵向通道9,其宽度稍小于或等于将要制造的薄膜1的厚度。
辊7和8都优选地设置有热调节和驱动器,它们未在图中示出,其中第二辊8在此情况下覆盖有柔性材料,例如橡胶。
另外,装置5还包括输送辊10,其上缠有PCTFE均聚物薄片11。
通过上述装置制造薄膜1的方法很简单,方法如下。
将PE、PP和/或PB与EGMA以已知方式同时挤压到第一辊7上,由此形成PE或其它类似物与EGMA共聚物的双层薄片12。
由于第一辊7在两个辊7和8之间通道9的方向上旋转而且两辊7和8反向旋转的结果使形成的双层薄片12被带走。
PCTFE薄片11从驱动辊10被引导至第二辊8上,并且在第一辊7与第二辊8之间被紧压在双层薄片12的EGMA共聚物的一侧,由此,PCTFE薄片11与双层薄片12被层压成型,这样便产生薄膜1,其中EGMA共聚物层形成上述的接合层4,并且第一辊7和第二辊8的设定温度在粘合双层薄片12与PCTFE薄片11中起主要作用。
在图3中示出依据此方法的一种变型,EGMA共聚物被挤压在聚烯烃薄片13与PCTFE薄片11之间,所述聚烯烃薄片13部分展开在第一辊7上,而PCTFE薄片11则被引导至第二辊8上。在两个辊7-8之间,不同的薄片11、13和EGMA层被层压成型。
本发明决不受作为示例给出并在附图中描绘的上述实施例所限制;相反,根据本发明用于包装液体产品或其它类似物的这种薄膜和可以被用来制造这种薄膜的方法,可以以各种形状和尺寸以及依照不同变型来制作,同时仍然保持在本发明范围内。

Claims (12)

1.一种用于包装液体产品或类似物的薄膜,其主要由第一聚烯烃层、接合层和聚三氟氯乙烯(PCTFE)层构成,其特征在于,所述PCTFE层(3)具有至少10微米(μm)的厚度并且由此薄膜(1)通过挤压层叠而获得。
2.如权利要求1所述的薄膜,其特征在于,所述薄膜通过将所述聚烯烃层(2)与所述接合层(4)共挤压层叠到所述PCTFE层(3)上获得。
3.如权利要求1或2中任一所述的薄膜,其特征在于,所述PCTFE层由PCTFE均聚物制成。
4.如前述权利要求中任一所述的薄膜,其特征在于,所述PCTFE层具有至少20μm的厚度。
5.如前述权利要求中任一所述的薄膜,其特征在于,所述接合层(4)由聚烯烃和甲基丙烯酸缩水甘油酯的共聚物形成。
6.如权利要求5所述的薄膜,其特征在于,所述接合层(4)由乙烯和甲基丙烯酸缩水甘油酯的共聚物(EGMA)形成。
7.一种可用于制造前述权利要求中任一所述的薄膜的方法,其中,挤压所述接合层,其特征在于,所述接合层(4)和上述PCTFE的薄片(11)与聚烯烃层(2)一起在第一辊(7)与第二辊(8)之间被挤压,由此,所述PCTFE薄片(11)被层压到所述接合层(4)上。
8.如权利要求7所述的方法,其特征在于,为了形成两层的薄片(12),所述接合层(4)与聚烯烃的层(2)一起被挤压在上述第一辊(7)上。
9.如权利要求7所述的方法,其特征在于,所述接合层(4)在所述辊(7-8)之间被挤压,由此,聚烯烃薄片(13)在第一辊(7)上被引导,而PCTFE薄片(11)则在第二辊(8)上被引导。
10.如权利要求7到9中任一所述的方法,其特征在于,至少所述第一辊(7)设有热调节。
11.如权利要求7到10中任一所述的方法,其特征在于,所述第二辊(8)覆盖以橡胶。
12.如权利要求7到11中任一所述的方法,其特征在于,所述第二辊(8)设有热调节。
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