CN101466543A - 可顺应和可冲切的轴向定向的标签原料和标签及制备方法 - Google Patents

可顺应和可冲切的轴向定向的标签原料和标签及制备方法 Download PDF

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CN101466543A
CN101466543A CNA2007800219888A CN200780021988A CN101466543A CN 101466543 A CN101466543 A CN 101466543A CN A2007800219888 A CNA2007800219888 A CN A2007800219888A CN 200780021988 A CN200780021988 A CN 200780021988A CN 101466543 A CN101466543 A CN 101466543A
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copolymer
film
label
adhesive
label stock
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CN101466543B (zh
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S·B·达曼
J·舒特
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Avery Dennison Corp
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Avery Dennison Corp
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    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001Combinations of extrusion moulding with other shaping operations
    • B29C48/0018Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B32B7/04Interconnection of layers
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18Manufacture of films or sheets
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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    • C09J7/22Plastics; Metallised plastics
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09J7/243Ethylene or propylene polymers
    • CCHEMISTRY; METALLURGY
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    • G09F3/08Fastening or securing by means not forming part of the material of the label itself
    • G09F3/10Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
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Abstract

可冲切的和可印刷的包括粘合剂的用于制备冲切粘合剂标签的标签原料,以及制备标签原料和冲切标签的方法,被描述。标签原料包括被挤压的轴向定向的单层或多层薄膜和粘合剂层。单层薄膜包括按重量计约25%到80%的丙烯聚合物或共聚物和按重量计约20%到约75%的聚乙烯。当温度约在聚乙烯熔解温度或超过聚乙烯熔解温度时,膜在轴向上被拉伸定向。

Description

可顺应和可冲切的轴向定向的标签原料和标签及制备方法
相关申请的交叉引用
【0001】本申请要求2006年6月14日提交的美国临时专利申请系列号60/804,757和2006年8月28日提交的美国临时专利申请系列号60/823,684的优先权权益。所述的临时专利申请在此处以它们全文引用的方式并入。
发明领域
【0002】本发明涉及标签原料,其是可顺应、可印刷和可冲切的,并涉及制备此种标签原料和冲切标签的方法。更具体地,本发明涉及可冲切和可印刷的粘合剂,其包含标签原料,用于制备标签,并涉及由此得到的冲切标签。
发明背景
【0003】长期以来,已知的生产和分配用于标签的压敏粘合剂标签原料是通过提供一层表面或表面原料材料,用于标签或标记,由一层压敏粘合剂(pressure sensitive adhesive)支持,并且PSA(压敏粘合剂)其反过来通常被释放衬垫或载体覆盖。衬垫或载体在运输和存储过程中保护粘合剂,并在标签被冲切和基体从表面原料材料层剥离后,允许有效地处理一批单个标签,直至到达单个标签在标签生产线上被顺序分配的点。从冲切到分配的时间里,衬垫或载体保持未切割,并可被卷起和打开,用于其上承载的一批单个标签的储存、转运和展开。
【0004】可靠性分配的故障,其典型特征是载体经过围绕它的剥离板后,标签无法从载体上分配或“远离”而用于应用于底物。这种分配故障被认为与标签表面原料材料和衬垫之间的过度释放值有关。分配性(dispensability)还取决于表面原料的刚度。分配故障的特征也可能是标签起皱,原因在于标签从载体转移至底物时,在此分配速度下,标签刚性缺乏。另一个标签应用中的具体需要是在高线速度下,应用聚合膜标签的能力,因为线速度的增加具有明显的节约成本的优势。
【0005】还有一种日益增长的需要是标签膜减厚,以提高标签原料的性能价格比。减厚膜的缺点是轴向刚度变得太低,无法保证标签的良好分配。过去,通过采用具有较高弹性模量和由此较高刚度的材料,已经克服了这个问题。
【0006】聚丙烯,特别是双轴定向聚丙烯(biaxially orientedpolypropylene,(BOPP)),已成功地在减厚应用中使用,原因在于聚丙烯价格相对便宜并显示出足够的刚度以使分配良好。但是,一般而言,聚丙烯显示出轴向和横向都相对高的拉伸模量值,这导致标签不是十分可顺应的,而且聚丙烯不易用压敏标签打印中最常用的基于UV的墨水打印。因此,通常的做法是通过添加打印表层(用共挤压)或可接受印刷的涂层,来改进聚丙烯的可印刷性。但是,这些解决方案增加了生产方法的复杂性和成本。
发明概述
【0007】在一个实施方式中,本发明涉及可冲切和可印刷的包括粘合剂的标签原料,用于粘合剂标签,其包括:
(A)被挤压的轴向定向的单层薄膜表面原料,其具有上表面和下表面,并包括由以下组成的混合物:
(A-1)按重量计约25%至约80%的至少一种丙烯聚合物或共聚物或至少一种丙烯聚合物或共聚物的掺合物,和
(A-2)按重量计约20%至约75%的聚乙烯
其中,轴向定向膜是通过在轴向上拉伸被挤压的膜而得到,拉伸温度从聚乙烯的约熔解温度到丙烯聚合物或共聚物的熔解温度,和
(B)粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘合地连接到表面原料的下表面。
【0008】在另一个实施方式中,本发明涉及可冲切和可印刷的包含粘合剂的标签原料,用于粘合剂标签,其包括:
(A)被挤压的轴向定向的多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层,与所述的底层表面接触,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯
其中,所述的底层丙烯含量大于所述的表层丙烯含量,并且,所述的轴向定向膜是通过拉伸被挤压的膜而得到,拉伸温度从约聚乙烯的熔解温度到丙烯聚合物或共聚物的熔解温度,和
(B)粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘合地连接到所述的表面原料下表面。
【0009】在另一个实施方式中,本发明涉及冲切标签,其从本发明的粘合剂标签原料得到。
【0010】而在另一个实施方式中,本发明涉及用于制备可冲切和可印刷的、包含粘合剂的标签原料的方法,其包括:
(A)挤压单层薄膜,其具有上表面和下表面,并包括由以下组成的混合物:
(A-1)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的被挤压的膜,拉伸温度从约聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,和
(C)将具有上表面和下表面的粘合剂层应用于所述的薄膜下表面,其中所述的粘合剂层上表面被粘连到薄膜下表面,以形成粘合剂标签原料。
【0011】而在另一个实施方式中,冲切标签由上述制备的粘合剂标签原料来制备,其通过
(D)将释放衬垫应用于所述的粘合剂层下表面,和
(E)在所述的粘合剂标签原料里冲切标签,而不在在衬垫里冲切。
【0012】在另一个实施方式中,本发明涉及用于制备轴向定向多层薄膜的方法,其包括:
(A)制备多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层,与所述的底层表面接触,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的多层薄膜,拉伸温度为约或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,和
(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到所述的多层薄膜下表面。
【0013】在另一个实施方式中,本发明涉及用于制备冲切轴向定向的多层薄膜标签的方法,其包括
(A)制备多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层与所述的底层表面接触,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的多层薄膜,拉伸温度为约或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,
(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到所述的多层薄膜下表面。
(D)将释放衬垫应用于所述的粘合剂层下表面,和
(E)在所述的粘合剂标签原料里冲切标签。
【0014】在一个实施方式中,所述的单层或多层薄膜表面原料的聚乙烯包括低密度聚乙烯。所述的根据本发明得到的标签原料和标签显示出期望的刚度,可顺应性,可分配性和可印刷性特征。
附图简述
【0015】图1A至1C是示意图,其显示了制造用于本发明中的轴向单层薄膜的方法。
【0016】图2A是根据本发明的标签原料的横截面图。
【0017】图2B是根据本发明的另一种标签原料的横截面图。
【0018】图2C是根据本发明的另一种标签原料的横截面图。
【0019】图3A是示意图,其显示了释放涂层和粘合剂在衬垫或载体原料上的应用。
【0020】图3B是示意图,其显示了来自图3A的衬垫或载体原料连接至表面原料。
【0021】图3C是示意图,其显示了来自图3B的表面原料的冲切,用于制造一系列有间隔的粘合剂标签,由衬垫或载体原料承载。
【0022】图3D是示意图,其显示了来自图3C的标签应用于处在通过中的工件。
实施方式说明
【0023】在一个实施方式中,本发明涉及轴向定向的单层和多层薄膜的发现,其可被制备成具有改进的可顺应性、可冲切性、可印刷性和可分配性的特征。如下将有更详细的说明,在一个实施方式中,本发明的所述包含粘合剂的标签原料,其包括:
【0024】(A)被挤压的轴向定向的单层薄膜表面原料,其具有上表面和下表面,并包括由以下组成的混合物:
(A-1)按重量计约25%至约80%的至少一种丙烯聚合物或共聚物或它们两种或两种以上的混合物,和
(A-2)按重量计约20%至约75%的聚乙烯,其中,轴向定向膜是通过在轴向上拉伸被挤压的膜,拉伸温度约从聚乙烯的熔解温度到丙烯聚合物或共聚物的熔解温度,和
【0025】(B)粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘合地连接到表面原料的下表面。
【0026】丙烯均聚物,可被用作单层薄膜的成分(A-1),单独或与丙烯共聚物组合起来,如此处所述,其包括各种丙烯均聚物,例如那些具有熔体流动速率(melt flow rates,MFR)从约1至约20g/10min,由ISO1133(230℃和2.16kg)测定。在另一个实施方式中,可在本发明使用的丙烯均聚物熔体流动速率可从约1至约15g/10min。
【0027】大量可用的丙烯均聚物可从各种来源购买。SABIC PP 500P是一种丙烯均聚物,其熔体流动速率为3.1g/10min、密度为0.905g/cm3和DSC熔点为160℃。SABIC PP 520P是一种丙烯均聚物,其熔体流动速率为10.5g/10min,密度为0.905g/cm3。另一种可用的丙烯均聚物是SABIC PP575P,其熔体流动速率为10.5g/10min,密度为0.905g/cm3和DSC熔点为167℃。其它可用于本发明膜的商用丙烯均聚物包括那些,在表1如下所列的。
表I 商用丙烯均聚物
 
商用名称 公司 熔体流动速率(g/10min)    密度(g/cm3)
WRD5-1057 Union Carbide 12.0 0.90
DX5E66 Union Carbide 8.8 0.90
5A97 Union Carbide 3.9 0.90
Z9470 Fina 5.0 0.89
Z9470HB Fina 5.0 0.89
Z9550 Fina 10.0 0.89
6671XBB Fina 11.0 0.89
3576X Fina 9.0 0.89
3272 Fina 1.8 0.89
SF6100 Montell 11.0 0.90
Stamylan P 17M10 DSM 10.0 0.90
Stamylan P 17U10 DSM 3.0 0.90
 
商用名称 公司 熔体流动速率(g/10min)    密度(g/cm3)
Appryl 3020 BT1 Atofina 1.9 0.905
Appryl 3050 FN1 Atofina 3 0.905
Appryl 3050 MN1 Atofina 5 0.905
Appryl 3060 MN5 Atofina 6 0.902
Bormod HD905CF Borealis 8 0.905
Moplen HP522J Basell 3 0.9
【0028】根据本发明,可用作单层薄膜表面原料一种成分的丙烯共聚物一般包括丙烯共聚物和按重量计达约40%的至少一种α-烯烃,其选自乙烯和包含从4个至约8个碳原子的α-烯烃。可用的α-烯烃实施例包括乙烯、1-丁烯、1-戊烯、4-甲基-1-戊烯、1-己烯、1-庚烯和1-辛烯。更经常地,可用于本发明的丙烯共聚物包括丙烯与乙烯、1-丁烯或1-辛烯的共聚物。可用于本发明的丙烯-α-烯烃共聚物包括无规共聚物以及嵌段共聚物。共聚物的掺合物以及共聚物与丙烯均聚物的掺合物可用于本发明薄膜配方。
【0029】在一个实施方式中,丙烯共聚物是丙烯-乙烯共聚物与含量为按重量计0.2%至约10%或按重量计约3至约6%的乙烯。关于丙烯-1-丁烯共聚物,1-丁烯的含量按重量计至约15%左右是可用的。本发明可用的丙烯-1-辛烯共聚物可包含按重量计至约40%的1-辛烯。
【0030】大量可用的丙烯共聚物可购得,其中一部分列于如下的表2。
表II 商用丙烯共聚物
 
商用名称 公司 %乙烯 %1-丁烯 熔体流动速率(g/10min)    密度(g/cm3)
DS4D05 Union Carbide -- 14 6.5 0.890
DS6D20 Union Carbide 3.2 -- 1.9 0.890
DS6D81 Union Carbide 5.5 -- 5.0 NA
SRD4-127 Union Carbide -- 8 8.0 NA
SRD4-104 Union Carbide -- 11 5.0 NA
SRD4-105 Union Carbide -- 14 5.0 NA
【0031】在一个实施方式中,丙烯均聚物或共聚物,或包含在用于形成单层薄膜的混合物中(A-1)掺合物的数量,可在按重量计约25%至约80%变化。在其他实施方式中,它们掺合物的丙烯均聚物或共聚物的数量可在按重量计从约30%至约80%或从约40%至约80%的范围。而在其他实施方式中,丙烯均聚物或共聚物或它们掺合物的数量可按重量计从约50%到约80%的范围。在另一个实施方式中,其数量按重量计可从约55%至75%。
【0032】在本发明中可用作单层薄膜表面原料的第二种成分包括至少一种聚乙烯。在一个实施方式中,所述的聚乙烯是一种低密度聚乙烯。术语“低密度”用于本申请,其包括密度约0.935g/cm3或更小的聚乙烯。密度约0.850到约0.935g/cm3的聚乙烯通常被称为低密度聚乙烯。可用于本发明的聚乙烯的特点是具有约0.1到约20g/10min范围的熔体流动速率。在另一个实施方式中,可用于本发明的聚乙烯的特点是具有约1到约5或10g/10min的熔体流动速率。
【0033】包括在单层薄膜内的聚乙烯数量按重量计在约20%至约75%的范围。在其它实施方式中,薄膜包含按重量计约20%至约70%,或约20%至约60%的聚乙烯。而在其他实施方式中,薄膜包含按重量计约25%至约50%或约25%至45%的至少一种聚乙烯(A-2)。
【0034】可用于本发明低密度聚乙烯示范例为低密度聚乙烯(the lowdensity polyethylenes,LDPE),线性低密度聚乙烯(the linear low densitypolyethylenes,LLDPE),极低密度聚乙烯(the very low density polyethylenes,VLDPE),超低密度聚乙烯(the ultra low density polyethylenes,ULDPE)和塑性体,其是由单一位点催化剂制备的VLDPE。
【0035】低密度聚乙烯(the low density polyethylenes,LDPE)可包括乙烯均聚物或乙烯与α-烯烃,如1-丁烯、1-己烯和1-辛烯的共聚物,或极性单体,如乙酸乙烯酯、丙烯酸甲酯或丙烯酸乙酯。LDPE均聚物密度可在从约0.920至约0.935的范围。与乙烯聚合的共聚单体数量按重量计一般不超过3.5或4%。
【0036】线性低密度聚乙烯(linear low density polyethylenes,LLDPE)是乙烯和α-烯烃的共聚物。虽然任何含有3个至20个碳原子的α-烯烃可用作LLDPE的共聚单体,但是四种最常用的是1-丁烯、1-己烯、4-甲基-1-戊烯和1-辛烯。在一个实施方式中,LLDPE的特点是具有从约0.915到0.925g/cm3范围的密度。
【0037】极低密度(VLDPE)和超低密度(ULDPE)聚合物通常包含少于4%的共聚单体,其特点是密度小于0.915g/cm3
【0038】使用单一位点催化剂制备的,并在本领域内被称为塑性体的极低密度聚合物通常包含更高数量的共聚单体(即按重量计达到约25%),塑性体的一般特点是具有约为0.912或更小的密度。
【0039】线性低密度聚乙烯可购得。大量LLDPE可以从Dex Plastomers购得,通用商品名称为“Stamylex”。例如,Stamylex 1016LF是一种1-辛烯线性低密度聚乙烯,其熔体流动速率为1.1g/10min,密度约为0.919g/cm3,DSC熔点为123℃;Stamylex 1026F是一种1-辛烯线性低密度聚乙烯,其熔体流动速率为2.2,密度为0.919g/cm3,DSC熔点为123℃;Stamylex 1046F是一种1-辛烯线性低密度聚乙烯,其熔体流动速率为4.4g/10min,密度为0.919g/cm3,DSC熔点为122℃;Stamylex 1066F是另一种1-辛烯线性低密度聚乙烯,其熔体流动速率为6.6g/10min,密度为0.919g/cm3,DSC熔点为124℃。
【0040】可用的LLDPE也可Borealis A/S(丹麦)购得,商品名称为
Figure A200780021988D0017094647QIETU
。例如,Borstar FB 4230是双峰线性低密度聚乙烯薄膜级,其密度为0.923g/cm3,熔解温度(ISO 11357/03)为124℃,熔体流动速率(190℃/2.16kg)为0.4g/10min(ISO 1133);Borstar FB 2310是高分子量聚乙烯薄膜级,其密度为0.931g/cm3,熔体流动速率(190℃/2.16kg)为0.2g/10min,熔解温度为127℃。可用的LLDPE可从Dow化学公司购得,包括Dowlex 2042E,其是乙烯/辛烯-1共聚物,其密度为0.930g/cm3,熔体指数(ASTM D1238)为1g/10min;Dowlex 2035G,其密度为0.919g/cm3,熔体指数为6g/10min和Dowlex SC2107,其是另一种乙烯/辛烯-1共聚物。
【0041】一个可用的LDPE实施例是Borealis A/S的HimodTM FT 5270。这种材料的密度为0.927g/cm3,熔体流动速率(190℃/2.16kg)为0.75g/10min,熔解温度为115℃。
【0042】在一个实施方式中,本发明单层薄膜表面原料的第二种成分包括至少一种中等或高密度聚乙烯。中等密度聚乙烯(Medium densitypolyethylenes,MDPE)通常密度在约0.935和0.940g/cm3之间。术语“高密度聚乙烯”(high density polyethylene)或“HDPE”是指密度约为0.940到约0.965g/cm3的聚乙烯。
【0043】可用于本发明薄膜的塑性体是的乙烯与α-烯烃的极低密度共聚物和三元共聚物,这些塑性体的特点是密度约为0.912g/cm3或更小。这些共聚物典型地包含约2至约30%或约5至约25%的α-烯烃。如上文已述,所述的α-烯烃包括1-丁烯、1-戊烯、1-己烯、1-庚烯、1-辛烯、1-癸烯和1-十二烯。特别可用的α-烯烃包括1-丁烯和1-己烯。乙烯三元共聚物的一个实施例是乙烯-1-己烯-1-丁烯。这些低密度乙烯共聚物可通过使用单一位点金属茂催化剂(single-site metallocene catalysts)将乙烯与α-烯烃共聚合来获得。这种共聚物可从Exxon Mobil化学公司、Basell和Dow化学公司购得。
【0044】可用的乙烯塑性体实施例包括EXACT系列塑性体,其可从Exxon-Mobil化学公司购得,其包括线性乙烯-丁烯共聚物,如EXACT 3024,其密度约0.905gms/cc,熔体指数约4.5g/10min;EXACT 3027,其密度约0.900gms/cc,熔体指数约3.5g/10min;EXACT 4011,其密度约0.888gms/cc,熔体指数约2.2g/10min;EXACT 4049,其密度约0.873gms/cc,熔体指数约4.5g/10min;和乙烯-己烯共聚物,如EXACT 4150,其密度约0.895gms/cc,熔体指数约3.5g/10min。
【0045】乙烯塑性体,如Dow化学公司出售的的商品名称为Affinity,也可应用于本发明。这些塑性体被认为是根据美国专利号5272236生产,其指导在此以全文引用的方式并入。所述的乙烯塑性体包括乙烯与至少一种C3-C20α-烯烃和/或C2-C20乙炔不饱和单体和/或C4-C18α-烯烃的共聚体。
【0046】这些乙烯塑性体的实施例包括:Affinity PF 1140,其密度约0.897gms/cc,熔体流动指数约0.5g/10min;Affinity PF 1146,其密度约0.90gms/cc,熔体指数约1g/10min;Affinity PL 1880,其密度约0.902gms/cc,熔体指数约1.0g/10min;Affinity EG 8100,其密度约0.87gms/cc,熔体指数约1g/10min;Affinity EG 8150,其密度约0.868gms/cc,熔体指数约0.5g/10min;Affinity EG 8200,其密度约0.87gms/cc,熔体指数约5g/10min和Affinity KC 8552,其密度约0.87gms/cc,熔体指数约5g/10min。
【0047】三元共聚物的实施例是Exxon的Exact 3006(一种乙烯-丁烯-己烯三元共聚物,其密度为0.910g/cm3,M.F.I.为1.2g/10min);Exact 3016(一种乙烯-丁烯-己烯三元共聚物,其密度为0.910g/cm3,M.F.I.为4.5g/10min);Exact 3033(一种乙烯-丁烯-己烯三元共聚物,其密度为0.900g/cm3(g/cc),M.F.I.为1.2g/10min(g/10′)),Exact 3034(一种乙烯-丁烯-己烯三元共聚物,其密度为0.900g/cm3(g/cc),M.F.I.为3.5g/10min(g/10′));DowAffinity PL 1840(一种乙烯-丙烯-丁烯三元共聚物);Dow Affinity PL 1845(一种乙烯-丙烯-丁烯三元共聚物);Dow Affinity PL 1850(一种乙烯-丙烯-丁烯三元共聚物)和Exxon Mobil ZCE 2005(一种乙烯-丙烯-丁烯三元共聚物)。
【0048】在一个实施方式中,本发明使用的可用于薄膜的聚乙烯包括聚乙烯,其熔体流动速率(melt flow rate,MFR)根据ISO 1133测定在约0.1至约20的范围,更常见的,在约1到约10的范围内。在另一个实施方式中,在温度(200℃-240℃)和挤压机剪切速率的挤压条件下,聚乙烯和丙烯均聚物或共聚物具有大约相同粘度是可取的。
【0049】在一个实施方式中,表面原料薄膜可成核。各种成核剂可被并入本发明使用的薄膜配方,成核剂的添加数量应足以对晶体结构提供可取的修饰,而不会对薄膜可取的性质产生不利影响。一般认为利用成核剂是可取的,其可用以修饰晶体结构并提供大量相当小的晶体或球晶以改进薄膜的透明度(清晰度)。添加到薄膜配方里的成核剂数量不应对膜的清晰度产生有害作用。加入本发明薄膜配方的成核剂数量通常相当小,从约500或从约750或从约850ppm。成核剂可能存在的数量至5000,或至约3000,或至约1000。
【0050】此前用于聚合物薄膜的成核剂包括矿物成核剂和有机成核剂。矿物成核剂的实施例包括炭黑、二氧化硅、高岭土和滑石。已被建议的可用于聚烯烃薄膜的有机成核剂,其中包括脂肪一碱价酸盐或二碱价酸盐或芳基烷基酸盐,如琥珀酸钠、戊二酸钠、己酸钠、4-甲基戊酸纳、苯乙酸铝和肉桂酸钠。芳香族和脂环族羧酸的碱金属和铝盐,如苯甲酸铝、苯甲酸钠或钾、β-萘酚钠、苯甲酸锂和叔丁基苯甲酸铝也是可用的有机成核剂。Wijga在美国专利号3207735、3207736和3207738以及Wales在美国专利号3207737和3207739,其所有都在1966年9月21日获得专利权,其表明脂肪族的、脂环族的和芳香族羧酸的、二元羧酸的或更高的多元羧酸、相应的酸酐和金属盐是对聚烯烃有效的成核剂。他们进一步指出,苯甲酸类化合物,特别是苯甲酸钠,是成核剂最好的实施方式。
【0051】在一个实施方式中,成核剂是山梨醇衍生物或磷酸酯。取代的山梨醇衍生物,如二(亚苄基)和二(烷基亚苄基)山梨醇,其中烷基基团包含大约2至大约18个碳原子,其是可用的成核剂。更具体地,山梨醇衍生物,如1,3,2,4-二亚苄基山梨醇和1,3,2,4-二-对-甲基亚苄基山梨醇是对聚丙烯有效的成核剂。可用的成核剂可从多种来源购得。Millad 8C-41-10,Millad 3988和Millad 3905是可从Milliken化学有限公司购买的山梨醇成核剂。
【0052】其它山梨醇和木糖醇缩醛是聚烯烃和其它热塑性塑料典型的成核剂。二亚苄基山梨醇(Dibenzylidene sorbitol,DBS)在美国专利号4016118中被Hamada等人首次公开作为一种对聚烯烃有效的成核和澄清剂。从那时起,大量的山梨醇和木糖醇缩醛被公开。代表性的美国专利包括:Kawai等人,美国专利号4314039,关于二(甲基亚苄基)山梨醇;Mahaffey,Jr.,美国专利号4371645,关于山梨醇双缩醛,其至少有一个氯或溴取代;Kobayashi等人,美国专利号4532280,关于二(甲基或乙基取代亚苄基)山梨醇;Rekers,美国专利号5049605,关于二(3,4-二甲基亚苄基)山梨醇,其包括取代基形成碳环。这些专利此处以引用方式并入。这些专利此处以引用方式并入。
【0053】用于本发明的轴向定向的单层薄膜还可能包含防结块剂。防结块剂添加至薄膜配方,减少了在卷裹过程中膜结块的趋势,调节薄膜的滑动和抗静电性能,并允许其从卷轴上平滑的展开。任何在以往技术领域里描述的防结块剂可包括在本发明的薄膜配方中,其作为可用添加剂修饰聚合物薄膜,特别是烯烃聚合物的性质。平均粒子大小约2微米或更小的二氧化硅可用于这一目的,只需要少量(例如,1000至5000ppm)的精制二氧化硅。几种基于合成二氧化硅的防结块剂可从俄亥俄州阿克伦A.Schulman公司购得,通用商品名称为
Figure A200780021988D00211
这些材料是防结块母料(masterbatch),包括自由流动颗粒,其包括丙烯均聚物或共聚物和所述的合成二氧化硅。例如,PolybatchABPP-05包括在丙烯均聚物中占5%的合成二氧化硅;ABPP-10包括在丙烯均聚物中占10%的合成二氧化硅和ABPP-05SC包括5%合成二氧化硅和无规丙烯共聚物。当防结块剂被用于本发明多层薄膜的制备时,防结块剂一般只添加到表层配方。可用的防结块剂是Ampacet的Seablock 1和Seablock 4。
【0054】在另一个实施方式中,薄膜组合物可包含至少一种操作助剂(the processing aid)。该操作助剂的作用在于促进挤压。这些操作助剂包括六氟碳聚合物。一个可购买到的可用操作助剂实施例是Ampacet 10919,其是Ampacet公司产品,被确定为是六氟碳聚合物。另一个可用的操作助剂实施例是Ampacet 401198。操作助剂典型性的使用浓度按重量计直到约1.5%,或从约0.5%至1.2%。在另一个实施方式中,操作助剂存在的量按重量计至约0.25%,在一种实施方式中按重量计约0.03%至约0.15%。
【0055】用于本发明的薄膜组合物还可能包含其他添加剂和粒状填料,以修饰薄膜的性质。例如,着色剂可被包括在薄膜中,如TiO2,CaCO3等。例如,少量TiO2的存在结果产生白色的表面原料。防结块剂也可以包括在配方中。AB-5是一种防结块浓缩物,可从俄亥俄州阿克伦的Schulman公司购得,其包括在95%低密度聚乙烯中有5%固体合成无定形二氧化硅。ABPP05SC是一种防结块浓缩物,可从Schulman公司购得,其包含5%合成无定形二氧化硅抗丙烯共聚物。存在于配方中防结块剂(二氧化硅)的用量可在约500至5000ppm范围。
【0056】在一些实施方式中,特别地是当希望薄膜透明时,薄膜无惰性粒状填料材料,虽然由于杂质等原因,极少量的粒状填料可存在于薄膜中。术语“无”(free of)在此处使用,拟指薄膜包含按重量计小于约0.1%粒状填料材料。在希望制备透明薄膜时,无粒状填料的薄膜是特别有用的,其可具有低混浊度的特征,例如,小于10%甚至小于6%的混浊度。混浊度或清晰度使用本领域已知的BYK-Gardne混浊度光泽仪来测定。
【0057】表3中的下列实施例说明了一些制备本发明使用的轴向定向的单层薄膜可用的成分。除非在以下的实施例、权利要求和其他书面说明中另有说明,所有的份数和比例都是按重量计算,温度是摄氏度,压力是达到或接近大气压力。
表III 示例性薄膜配方
                  丙烯聚合物                乙烯聚合物
实施例      名称             用量           名称                 用量
                            (Amt)                               (Amt)
                            (%w)                               (%w)
1       Sabic PP 575P        60          Stamylex 1066F         40
2       Sabic PP 575P        60          Stamylex 1016LF        40
3       Sabic PP 575P        60          Stamylex 1026F         40
4       Sabic PP 500P        60          Stamylex 1016F         40
5       Sabic PP 500P        60          Stamylex 1066F         40
6       Sabic PP 500P        70          Stamylex 1066F         30
7       Sabic PP 500P        80          Stamylex 1016LF        30
8       Sabic PP 520P        40          Dowlex SC2107          60
9       Sabic PP 500P        45          Stamylex 1066F         55
10      Sabic PP 520P        35          Dowlex SC2107          65
11      Sabic PP 520P        30          Dowlex SC2107          70
12      Sabic PP 571P        50          Stamylex 1026F         50
13      Sabic PP 571P        55          Stamylex 1026F         45
14      Sabic PP 571P        45          Stamylex 1026F         55
15      Sabic PP 520P        50          Stamylex 1026F         50
16      Sabic PP 520P        45          Stamylex 1026F         55
17      Sabic PP 520P        40          Stamylex 1026F         60
18      Sabic PP 520P        25          Stamylex 1026F         75
19      Sabic PP 520P        60          Dowlex SC2107          40
【0058】可用于本发明的单层薄膜是通过本领域普通技术人员熟知的挤压技术制备,薄膜厚度可从约0.5密尔(mils)(12.5微米)至约3、4或5密尔(mils)。更经常地,薄膜厚度约2至约3密尔(mils)。已发现,这种减厚的薄膜显示出可取的刚度和模量值,以提供在高速分配时可冲切/可分配的并是可顺应的薄膜。在一个实施方式中,薄膜只在轴向上被定向拉伸。
【0059】如上所述,本发明使用的单层薄膜是在轴向已被定向的薄膜。在一个实施方式中,轴向定向薄膜是通过在轴向上热拉伸薄膜而获得,拉伸比为至少2:1。在本发明的其它实施方式中,膜被热拉伸的比例至少约3:1、或至少5:1或至少约6:1、或至少约7:1至约9:1或10:1。在一个实施方式中,膜被热拉伸的比例为6:1至约9:1。
【0060】本发明的一个特点是热拉伸在温度约为聚乙烯的熔解温度至形成薄膜的混合物中使用的丙烯聚合物或共聚物熔解温度的范围内进行。术语“熔解温度”此处使用是指聚合物DSC熔点(DIN 53765)。已发现,在约或超过聚乙烯的熔解温度且低于丙烯聚合物的熔解温度下,进行热拉伸操作,可获得改进的可冲切性和可印刷性。因此,典型的拉伸温度,取决于具体使用的聚乙烯,其可在约115℃至145℃的范围内。在其他实施方式中,采用的拉伸温度为在约125℃或超过约125℃。在如此高的温度下拉伸通常也会产生低收缩薄膜(例如,举例来说,在70℃下,收缩率小于2%)。
【0061】在一个实施方式中,单层薄膜(或下文所述的本发明多层薄膜),已在轴向被定向拉伸,而在加热的条件下,其经过加热退火辊,在此情况下,被拉伸的薄膜被退火或热变定。热变定或退火操作之后,薄膜经过冷却辊,以完成拉伸和热变定操作。在热变定步骤(如拉伸一步)所用的温度取决于掺合物中使用的具体的聚合物,这些温度可从约100℃到约150℃的范围。用于热拉伸和热变定步骤的温度可能会大致相同,但在某些情况下,热变定的温度低于热拉伸使用的温度。在一个实施方式中,退火辊的温度可从约100℃到约140℃;在另一个实施方式中,退火温度可从约110℃到约135℃。
【0062】在一个实施方式中,被挤压的单层薄膜,其是轴向定向的,可用图1A-1C所描述和图示的一般方法制备。聚合物组合物被融化,融化的进料通过挤压冲模190被挤压,如图1A所示意。被挤压的薄膜被投入冷却的第一铸造辊191,继而围绕冷却的第二铸造辊192,通过剥离辊193被推进。第二冷却辊并非总是需要的。
【0063】如上所述,薄膜刚度对标签在高线速度下的正确分配是重要的。图1B显示了热拉伸站,其中通过以如上所述的拉伸比在轴向上定向薄膜,平型原料M在轴向的刚度被增加。轴向拉伸也增加了薄膜的MD拉伸模量,这有助于尺寸稳定性和良好的印刷套准。正如上文指出,观察到在约或超过聚合物混合物中聚乙烯成分的熔解温度进行拉伸,结果可改进薄膜的可冲切性和可印刷性。
【0064】平型原料M围绕预热辊201和202经过后,其中预热辊201和202软化原料,然后平型原料在热定向辊对205和206之间拉伸,后者以预热辊201和202旋转速度的倍数旋转,其相对应于所希望的拉伸比,例如7:1。拉伸后,所述的原料经过退火辊209和210,在其中原料被退火或热变定,并且,最后,原料经过冷却辊212来完成热拉伸操作。随后,原料可能会被接受为图1C所示的卷形式。
【0065】表四的下列实施例A-V说明了用于本发明的轴向定向单层薄膜的制备。利用如上所述的一般方法制备薄膜,采用表四指定的铸造、预热、拉伸和退火温度以及拉伸比。对照薄膜,如实施例C-A至C-F所确定,也利用同样的设备制备,但是采用较低的拉伸温度。
表IV 膜制备
                          温度(℃)
薄膜     薄膜配方     铸造辊      预热辊     拉伸辊      退火  拉伸比   卡尺(μm)
A        实施例1      65          105        125        110   7:1      57
B        实施例3      63          105        125        110   9:1      48
C        实施例3      63          105        135        110   9:1      52
D        实施例4      60          105        125        110   7:1      54
E        实施例5      60          105        125        110   7:1      46
F        实施例2      67          105        125        110   7:1      48
G        实施例3      63          105        125        110   7:1      52
H        实施例8      65          110        125        105   6:1      61
I        实施例8      65          110        125        105   8:1      59
J        实施例10     65          105        125        105   8:1      59
K        实施例11     65          110        125        105   8:1      64
L        实施例12     65          110        125        105   6:1      58
M        实施例13     65          110        125        105   6:1      59
N        实施例13     65          110        125        105   8:1      59
O        实施例14     65          110        125        105   6:1      59
P        实施例14     65          110        125        105   8:1      60
Q        实施例15     65          110        125        105   6:1      68
R        实施例15     65          110        125        105   8:1      61
S        实施例16     65          110        125        105   6:1      59
T        实施例16     65          110        125        105   8:1      59
U        实施例17     65          110        125        105   6:1      62
V        实施例17     65          110        125        105   8:1      67
对照薄膜制备
对照薄膜
C-A      实施例1      65          105        105        110   7:1      56
C-B      实施例5      60          105        105        95    7:1      44
C-C      实施例4      60          105        105        100   7:1      57
C-D      实施例2      67          105        105        110   7:1      49
C-E      实施例12     65          110        120        105   6:1      58
C-F      实施例14     65          110        115        105   8:1      38
C-G      实施例10     65          105        120        105   6:1      57
【0066】轴向定向的多层薄膜也可用于本发明。所述的多层薄膜一般应包括:
【0067】(A)底层,其具有上表面和下表面,包括至少一种丙烯聚合物或共聚物和至少一种聚乙烯聚合物的混合物,和
【0068】(B)至少一个表层,在所述的底层上表面之上或者在底层的上下表面的两者之上,其中所述的表层包括
按重量计约25%至约80%的至少一种丙烯均聚物或共聚物
或至少一种丙烯均聚物或共聚物的掺合物,和
按重量计约20%至约75%的至少一种聚乙烯其中所述的轴向定向多层薄膜的获得是通过在轴向拉伸多层薄膜,拉伸温度从聚乙烯的熔解温度至丙烯聚合物或共聚物的熔解温度。上述关于单层薄膜组合物的讨论也适用于表层。这就是说,上述可用于单层薄膜组合物也可用于表层或多个表层。
【0069】在一个实施方式中,在底层中的丙烯均聚物或共聚物的含量大于在表层中的丙烯均聚物或共聚物的含量。因此,用于底层的混合物可能包括按重量计约30%或约50%或约60%左右甚至约70%至约95%或甚至99%的聚丙烯,约1或5%至约70%的聚乙烯。例如,在本发明的一个实施方式中,底层包括按重量计约60%的丙烯均聚物和按重量计约40%的LLDPE,表层包括约40%的丙烯均聚物或无规丙烯共聚物和约60%的LLDPE。
【0070】一般来说,底层与表层或多个表层相比,相对较厚。因此,在一个实施方式中,底层的厚度是表层厚度约5至10倍或更高倍数。例如,两层薄膜的厚度比(底层:第一表层),包括50:5、45:10和45:5;对于三层薄膜,(第一表层:底层:第二表层)5:50:5等。
【0071】在一个实施方式中,多层薄膜包括底层和至少一个表层,可能用本领域已知的共挤压在一起的各层或层压预制层的方法制备。共压出物层可从一个合适的已知类型的共挤压冲模中同时挤压而形成,各层以永久结合状态互相粘附。在一些实施方式中,底层与表层或多个表层相比,可能相对较厚。
【0072】在一个实施方式中,用于底层的丙烯均聚物或共聚物与用于表层(多个表层)的丙烯均聚物或共聚物相同;在另一个实施方式中,所述的丙烯均聚物或共聚物是不同的。同样地,在一个实施方式中,用于底层的聚乙烯与用于表层(多个表层)的聚乙烯相同,或用于底层的聚乙烯可不同于用于核心层的聚乙烯。对于不同的聚乙烯可被用于底层混合物和表层混合物的情况,在薄膜定向中采用的拉伸温度至少是较低熔点聚乙烯的熔解温度。
【0073】上文所述可用于单层薄膜的任何丙烯均聚物和共聚物和聚乙烯可用于多层薄膜的底层和表层或多个表层。
【0074】多层薄膜可用本领域普通技术人员已知的方法制备。代表性地,薄膜在温度120℃至约290℃之间或从约150℃至约260℃之间挤压。一个制备多层薄膜的可用方法是在230℃挤压。共挤压的多层薄膜是在轴向以如上所述单层薄膜相同的方式在相同条件下定向。也就是说,多层薄膜拉伸定向在温度约或超过底层和表层(多个表层)聚乙烯(多种聚乙烯)的熔解温度下进行。如果有一种以上类型的聚乙烯包括在多层薄膜中,薄膜在温度达到或超过聚乙烯最高熔点下被拉伸。拉伸定向的多层薄膜随后可如同上文所述关于单层薄膜一样被退火或热定型。因此,关于图1A、1B和1C如上所述的方法也适用于多层薄膜。
【0075】在如上所述的共挤压轴向定向的多层薄膜中,其中底层包含一个增加数量的丙烯均聚物或共聚物,这种底层的特点是,与获得较低数量聚丙烯的底层相比,具有较高的刚度。此外,在一个实施方式中,令人满意的表层或多个表层和底层的粘附,是在底层和表层或多个表层之间不需要一种粘合剂时,其是粘牢的。
【0076】下列实施例AA显示了根据本发明的轴向定向的多层薄膜。
实施例AA
【0077】实施例19的薄膜配方和实施例8的薄膜配方通过共挤冲模同时挤压而被共挤压,并且,两层以永久结合的状态互相粘附。每层的厚度调整为两层薄膜在其拉伸后总厚度约60微米,底层厚度为表层厚度的10倍。随后,所述的两层薄膜被预热、拉伸和退火,采用上文所述的单层薄膜方法,利用铸造温度65℃、预热温度110℃、拉伸温度125℃和退火温度105℃。拉伸比为8:1。以这种方式获得的定向两层薄膜的特点是厚度为61微米。
【0078】在另一个实施方式中,本发明涉及用于制备轴向定向多层薄膜标签原料的方法,其包括:
(A)制备多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层与所述的底层表面接触,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的多层薄膜,拉伸温度为约或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,和
(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到所述的多层薄膜下表面。
【0079】在一个实施方式中,(B)中得到的拉伸定向多层薄膜被退火或热定型,然后应用(C)中所述的粘合剂层。
【0080】按如上所述制备用于本发明的相对较厚薄膜的特点之一,是所述的厚薄膜轴向刚度足够高,以提供改进的性能,如高速可分配性;横向刚度足够低,以提供冲切标签,其是可顺应的。在一个实施方式中,薄膜MD刚度是至少20mN,在其他实施方式中,MD刚度是至少25、或至少28或至少30或甚至35mN。上述的薄膜横向(the cross direction,CD)刚度远远低于MD。因此,例如,在一个实施方式中,MD刚度是CD刚度的至少2到3倍。在其他实施方式中,MD刚度是CD刚度的约3到约5倍。
【0081】用于本发明的轴向定向单层和多层薄膜的刚度是采用L&W抗弯曲测试仪(测试方法:ISO 2493)测定。一般来说,以mN的L&W刚度和通过TAPPI T543PM-84测定的Gurley刚度之间的关系是:L+W=1.75×Gurley。
【0082】实施例A-G和AA的薄膜和对比薄膜CA-CF的L+W刚度测试用测试方法ISO 2493测定,结果总结在表四。在测试中,弯曲角度是15°;测量边缘和旋转轴之间的距离是5mm;样品高度是38mm;样品长度足以被钳制和接触,与测量边缘有重叠(典型性的约50mm)。
【0083】本发明的标签原料和标签的优势之一是可用的标签可以被制备成比本领域许多目前使用的标签更薄的标签。因此,已发现,本发明的标签原料和标签包含表面原料,其具有从25至75微米(1至3mils)或从约45至65微米的厚度,可用于高速分配。因此,本发明使用的薄膜(例如薄膜A到G和AA)和对照薄膜(薄膜C-A到C-F)的L&W刚度值被修正至55微米,以提供在这个厚度下的相对效用表示。55微米修正采用下列公式,其中m是所测量的被测薄膜厚度。
MD55=MDmX(55/m)3
【0084】这一计算基于薄膜厚度是均匀的假设,即整个厚度的弹性模量相同。
【0085】上文所述的且可用于本发明的表面原料和标签的薄膜还具有的特点是比在CD上高得多的MD模量。在一个实施方式中,薄膜的MD模量可为约2500MPa或更高,CD模量会低至400或500MPa。在另一实施方式中,MD模量是CD模量的至少3.5或至少4倍。模量是Young=s模量,依照ISO 527-1使用Zwick Z010测量。
【0086】上文所述的和在本发明标签原料和标签制备中使用的表面原料还具有的特点是低收缩。在一个实施方式中,薄膜显示出在70℃小于3%甚至小于2%的收缩。在一个实施方式中,薄膜显示出在70℃小于1%的收缩。在此测试中,在23℃和50%相对湿度下,使薄膜适应后,薄膜的长度被测量,是在70℃下在水中浸泡2分钟之前和之后予以测量,并且用公式计算收缩率:(之前长度-之后长度/之前长度)。
【0087】实施例A至G和对比实施例CA至CD的薄膜收缩率测试结果总结于表五。
【0088】上文所述的和在本发明标签原料和标签制备中使用的表面原料还具有的特点是改进的可印刷性,特别地,使用印刷压敏标签最常用的基于UV的墨水,而不降低其他可取的属性,如可冲切性、收缩等。本发明标签原料和标签的可印刷性测定是用电晕(corona)处理薄膜,采用Vetaphone Corona Plus TF-415以50W-min/m2进行。随后,一层2.1至2.7g/m2来自XSYS的Uvonova Process Magenta UNV30080被应用于IGT C1可印刷性测试仪。墨水是在Primarc Minicure上以30m/min和80W/cm被UV固化,墨水粘附用胶带测试方法直接和在24小时后评估,根据ASTMD3359采用Scotch 810胶带进行。在此项测试中,墨水粘附或锚定的评估是通过运用Scotch 810胶带,通过压到印刷图像上方,然后迅速去除胶带进行。薄膜胶带上的墨水残留量被记录为从0到5的等级,A0"代表墨水完全转移至胶带,A1"代表墨水严重地转移至胶带,A5"代表没有墨水转移到胶带。
【0089】实施例A至G和对比实施例C-A至C-D所述薄膜的墨水粘附测试结果总结于表五。实施例H-V,AA的薄膜和对照薄膜C-E至C-F的墨水粘附测试结果总结于表六。其中显示,实施例A至G的轴向定向薄膜,其在高于聚乙烯的熔解温度的温度下被拉伸定向,与在较低温度被拉伸的C-A至C-D薄膜相比,显示出更好的墨水粘附。
【0090】在一个实施方式中,本发明涉及可冲切和可打印的包含粘合剂的标签原料,用于粘合剂标签。上文已述的薄膜在本发明的标签原料和标签中用作表面原料薄膜。标签原料一般包括上文所述的轴向定向单层或多层薄膜(表面薄膜)和粘合剂层。所述的粘合剂层一般是与单层薄膜表面接触并粘合地连接到其上。防护释放衬垫可附着到粘合剂层的暴露表面。
【0091】图2A显示了本发明的标签原料的一个实施方式,用于制备粘合剂标签。所述的标签通常是指数字20,其包括如上所述的轴向定向单层薄膜表面原料的单层21和粘合剂层22,粘合剂层22粘附地连接到薄膜21的下表面。
【0092】图2B显示了本发明标签原料的另一个实施方式,用于制备粘合剂标签。在此实施方式中,标签原料的表面原料薄膜通常是指数字20A,其包括两层,上文所述的底层25和表层21,其与上文所述的单层薄膜相对应。表面原料,其包括底层25和表层21,在与粘合剂层22接触以前如上所述已被轴向定向,其粘合地连接至底层25的下表面。图2C显示了本发明标签原料的另一个实施方式,通常是指数字20B。标签原料20B包括多层表面原料,其本身包括底层25、在底层两个表面上的表层21和粘合剂层22,粘合剂层22粘合地连接至表层21的下表面。如上所述,表面原料,其包括底层25和表层21,其是在粘合地连接至粘合剂层22之前,已如上所述被轴向定向。
【0093】用于本发明标签原料的粘合剂层,例如在图2A、2B和2C中所显示的,可被直接涂布在所示层的下表面,或粘合剂可从释放衬垫与表面原料的结合来被转移。典型地,粘合剂层的厚度约0.4至约1.6密尔(mils)(10至约40微米)。适用于本发明标签原料的粘合剂是本领域常用的。一般来说,这些粘合剂包括压敏粘合剂、热激活粘合剂,热熔粘合剂等。压敏粘合剂(Pressure-sensitive adhesives,(PSAs))是特别优选地。这些包括基于丙烯酸的粘合剂以及其他高弹体,如天然橡胶或合成橡胶,其包含苯乙烯、丁二烯、丙烯腈、异丁烯和异戊二烯的聚合物或共聚物。PSAs也是本领域熟知的,任何已知的粘合剂都可用于本发明表面标签。在一个优选的实施方式中,PSAs是基于丙烯酸酯,例如,诸如2-乙基己基丙烯酸酯与极性共聚单体,如丙烯酸的共聚物。
【0094】在一个实施方式中,本发明涉及冲切轴向定向的单层薄膜标签的制备,其所用方法包括:
【0095】(A)挤压单层薄膜表面原料,其具有上表面和下表面,并包括由如下组成的混合物:
(A-1)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2)按重量计约20%至约75%的至少一种聚乙烯
【0096】(B)在轴向拉伸定向所述的被挤压的膜,拉伸温度在约或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,
【0097】(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到薄膜下表面。
【0098】(D)将释放衬垫应用于所述的粘合剂层下表面,和
【0099】(E)在所述的粘合剂标签原料里冲切标签。
【0100】在另一个实施方式中,冲切轴向定向的薄膜标签由所述的方法制备,其包括:
【0101】(A)制备多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)使至少一个表层与所述的底层表面接触,其中所述的表层包括由以下组成的混合物:
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯其中所述的底层丙烯含量大于所述的表层丙烯含量
【0102】(B)在轴向定向拉伸所述的薄膜,拉伸温度为约聚乙烯的熔解温度或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,
【0103】(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到所述的多层薄膜下表面,
【0104】(D)将释放衬垫应用于所述的粘合剂层下表面,和
【0105】(E)在所述的粘合剂标签原料里冲切标签。
【0106】如上所述,拉伸定向的薄膜可在应用于粘合剂层之前,被退火或热变定,粘合剂层和释放衬垫可以在一个步骤被连接至单层和多层薄膜表面原料,通过在起始时涂布粘合剂至释放衬垫,随后将暴露的粘合剂表面应用于薄膜表面原料。
【0107】根据本发明进行的标签原料和冲切标签的制造显示于图3A-3D。如上所述,本发明标签原料的制造,根据本发明,使用上文所述的轴向定向单层薄膜作为表面原料,可提供衬垫或载体原料。衬垫或载体30可包括多层衬垫,如根据美国专利号4713273所公开的进行制造,所述的公开在此处以引用方式并入;或可以是常规的衬垫或载体,其由一层纸或薄膜层组成,可以卷的形式提供。如果以前没有提供释放涂层,并且本身并不包括成分用于固有地在其包含粘合剂的面上产生释放表面,衬垫或载体30可在R站被涂布上释放涂料,如图3A所示。如果释放涂层被应用,在应用后,通过任何适合的方法(未显示),其被干燥或固化。如果衬垫或载体30包括塑料压出物,那么在R站应用释放涂层之前,所形成的薄膜可被热拉伸以提供衬垫或载体30的定向。
【0108】释放衬垫或载体的释放表面可被涂布上一层粘合剂,用于随后将粘合剂转移至被衬垫或载体连接的表面原料。当表面原料与衬垫或载体结合时,粘合剂被连接到表面原料。之后,衬垫或载体被去除以暴露粘合剂,其仍保持与表面原料永久的连接。
【0109】因此,如图3A所示,在干燥或固化事先应用于R站的释放涂层之后,粘合剂可应用于S站。这可能是一个串联涂布操作(tandemcoating operation),或粘合剂涂料可能用在一个单独的涂布生产线上。可选地,粘合剂可应用在将释放衬垫或载体30与表面原料31连接之前的某个稍后的时间。衬垫或载体30与表面原料71的连接如图3B所示。可选地,在表面原料和衬垫或载体结合之前,粘合剂可直接涂布在表面原料31上。
【0110】在某些应用中,粘合剂可能是热激活粘合剂或热熔粘合剂,如用于模内标签应用(in-mold label applications),正如区别于压敏粘合剂,在这种情况下,有可能没有必要提供释放衬垫或固有的释放性,这在使用压敏粘合剂时是需要的。
【0111】标签表面原料可以在被冲切至单个标签之前,在印刷站(未显示)被印刷。印刷步骤可发生在衬垫和表面原料结合之前或之后,但应在表面原料冲切至单个标签之前。薄膜必须在印刷步骤之间(例如,在不同颜色逐次印刷之间)保持准确定位(remain in accurate register),以使图象或文字具有较高质量,以及在印刷和随后的冲切中保持准确定位,以使图象或文字正确定位于标签。薄膜在印刷过程中处于拉紧状态(undertension),还可能会在温度上受到一些上升,例如当UV墨水被固化时,并且不能显著地在轴向拉伸。当聚合物薄膜衬垫被使用或不需要衬垫时,表面原料薄膜的MD拉伸性质是特别重要的。
【0112】图3C示意性显示了:在T站处,表面原料31冲切成一系列有间隔的压敏标签32,其被释放衬垫或载体30承载。这一步骤可以通过如下进行,例如,旋转或平板金属刀模以熟知的方式,涉及梯形基质(未显示)废物的剥离或在成形标签周围的修剪,是在当它们被冲切之后(梯子的“梯级”(the“rung”of the ladder)表示连续标签之间的间隔)。然后,标签彼此之间被有间隔的保留在衬垫上,如图所示。在此操作中一个失败的模式涉及较差的冲切标签,其保留在被剥离的基质上。在这种模式中,随释放水平下降,较差的冲切更可导致标签留在所附的基体材料上,并在基体剥离过程中,从衬垫上去除。图3D显示了将标签32应用于经过工件33,通过使用剥回边缘34以分散标签32,通过逐渐从它们之上去除衬垫或载体,从而暴露了标签的粘合剂侧面35,并使标签伸出而与经过工件33接触。
【0113】工件33可构成刚性底材,如玻璃瓶或其它刚性部件,趋向于具有不规则表面,因此要求标签具有弹性并可紧密粘附(顺应)至表面,而没有遮蔽局部表面的凹陷。可选地,工件可以是柔软的、有弹性的底材,如塑料容器,当容器可弯曲时,要求标签可弯曲。
【0114】可以理解的是图3A至3D所述的操作可在不同地点由不同的制造商来执行,或者它们也可以被合并。例如,图3A的步骤可以由衬垫和粘合剂制造商来执行,图3B和3C可由标签制造商以一个连续的过程执行,而不是如图所示的被卷起/展开序列所打断,图3D的步骤可由制成品的包装装置来执行。
【0115】形成标签的表面原料通常是卷曲的,并以卷形式释放,因此,这是已知的“卷原料”或“卷表面原料”(“roll stock”或“roll facestock”)是其一种形式,并且所附的衬垫或载体被称为“卷衬垫”(“roll liner”)。
【0116】上文所述的并用于本发明冲切标签的单层轴向定向薄膜表面原料一个重要的优势是改进的标签可冲切性。例如,已观察到,本发明标签的冲切提供了锋利和清晰的切割,以使标签完全从基质分离,沿切口标签边缘,可得到较低的冲切压力,并且切削工具不一定必须如切割本发明的表面原料标签薄膜所用的那样锋利。未能实现标签和周围基质之间整齐冲切的周边可导致基质在轴向或横向的破裂,并将其与标签一起保留在释放衬垫上。这一缺陷会对应用双重标签或应用标签加基质带(或多条带)至底材产生不利影响。
【0117】采用升高的拉伸温度、由实施例组合物所制备的薄膜的可冲切性,用薄膜冲切形状和对其后将基质从冲切形状分离所需的摩擦能(thefrictional energy,DFE)测定来评估。如下所述,摩擦能的计算是测量在移动试验样品的过程中,冲切形状从基质分离所需的力。低摩擦能值表示层压材料显示出良好的可冲切性。这项测试的指导在如下的美国专利号5961766中有更详细的描述,其在此处以引用的方式并入。
【0118】每种薄膜的测试样,其具有7×10"(17.8×25.4cm)的尺寸,通过冲刀被推进,在此处,在表面原料里切割出10个标签。冲切辊的直径为3英寸(76.2mm),其中有一个膜腔贯穿,周围有10个膜腔。每个模腔长6英寸(152.4mm)(或贯穿),宽(或深)15/16英寸(22.25mm),圆角直径为3/32英寸(2.38mm)。邻近膜腔之间的距离是1/8英寸(3.175mm)。砧辊的直径为5英寸(127mm)。冲模的砧和顶之间的距离为2.2mils(0.0559mm)。冲模压力是300psi(0.2Mpa),冲模速度是15m/min。
【0119】每个测试样片的冲切深度足以穿透薄膜。标签被制成长方形的形状,并排排列在测试样片上,一个标签贯穿,十个深入。标签的长边维度与下一个邻近标签的长边维度平行。标签的尺寸为7/8×6"(22.25mm x 152.4mm),相互之间距离相等。每个标签之间的间距是1/8英寸(3.175mm)。基体,其包括标签周围的废弃表面标签部分,也在冲切过程中形成。
【0120】测试样品由切割冲切测试样片来形成,其沿一个标签长边维度的中线,然后沿下一个相邻标签长边维度的中线。切口互相平行。每个测试样品包括一个标签的一半,下一个相邻标签样品的一半,和标签部分周围的基体。
【0121】将基体从每个样品的冲切标签分离的摩擦能(The frictionalenergy,(DFE))使用修正的TA-XT2结构分析仪测量,其由Stable MicroSystems,Unit 105,Blackdown Rural Industries,Haste Hill,Haslemere,Surrey GU 273AY,England提供。TA-XT2结构分析仪是一种拉仲测试装置。其修正如下:顶端十字头上的夹具(the fixture)被去除,并取代为上部L形支架;上部L形支架的一个臂状物被连接到上层框架;安装在底层的平台被去除,并取代为下部L形支架。每个测试样品的测试是通过将测试样品的基体末端连接至上部L形支架,将每个临近所连接基质末端的标签部分连接至下部L型支架。激活结构分析仪,基体以5mm/s的速度从标签部分分离。
【0122】用于分离基体的力,以及在分离过程中此力沿测试样品长度的转移,使用TA-XT2结构分析仪提供的软件绘曲线图。所绘制图的曲线下区域也使用TA-XT2结构分析仪提供的软件来测定。所绘制的曲线下区域具有克-秒单位。其结果在作出适当的单位修正后(如,将mm改为cm)乘以剥离速度(5mm/sec),摩擦能的结果以克-厘米(g-cm)来提供。较高的摩擦能值与较差的切割表面原料或粘合剂背面有关。
【0123】测试每个薄膜的10个测试样品,并报告这些测试样品的平均值。读出零(0)值表明整齐的切割标签,其冲切后完全从基体上脱离。
【0124】实施例A-V,AA和对比实施例CA至CG薄膜摩擦能测试的结果总结在表五和表六。如其所示,实施例A至G的轴向定向薄膜,其在超过聚乙烯熔解温度的温度下被拉伸定向,显示出良好的可冲切性,而在较低温度拉伸的相关薄膜裂开或不能容易地和整齐地切割。
Figure A200780021988D00371
表VI 薄膜性质
薄膜      L+W刚度(mN)     L+W刚度(mN1)       DFE      墨水粘附
发明        MD                MD             (g.cm)   起始       24H
H           22                16             24       4          4
I           29                23             18       4-5        4
J           24                20             23       4          4-5
K           28                17             14       4-5        4-5
L           28                24             59       4-5        5
M           28                23             59       3-4        5
N           38                30             73       4          4-5
O           22                18             45       3-4        4
P           29                23             29       4          4
Q           31                16             46       4          4-5
R           40                30             28       4-5        4-5
S           28                22             39       3-4        4
T           32                26             78       4-5        4-5
U           31                22             37       4          4-5
V           46                25             11       4-5        5
AA          45                33                      4-5        5
对照
C-E         27                23             97       4-5        5
C-F         12                38             439      3          3
C-G         26                23             154      3-4        4
【0125】虽然发明已被相关实施方式解释,但是可以理解本领域普通技术人员根据阅读说明书而对它们进行各种修改应该是显而易见的。因此,可以理解此处公开的发明拟涵盖这些落入在附加权利要求的范围内的修改。

Claims (43)

1.可冲切和可印刷的包含粘合剂的标签原料,用于粘合剂标签,其包括:
(A)被挤压的轴向定向的单层薄膜表面原料,其具有上表面和下表面,并包括:
(A-1)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2)按重量计约20%至约75%的至少一种聚乙烯其中,轴向定向膜是通过在轴向上拉伸被挤压的膜而得到,拉伸温度从约聚乙烯的熔解温度到丙烯聚合物或共聚物的熔解温度,和
(B)粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘合地连接到表面原料的下表面。
2.根据权利要求1所述的标签原料,其中(A-1)是丙烯均聚物。
3.根据权利要求1或2所述的标签原料,其中(A-1)包括丙烯共聚物和至少一种α烯烃,其选自乙烯和包含4到约8个碳原子的α烯烃。
4.根据权利要求1-3任何一项所述的标签原料,其中(A-1)具有约1到约20g/10min的熔体流动速率。
5.根据前述权利要求任何一项所述的标签原料,其中(A-2)是乙烯共聚物。
6.根据前述权利要求任何一项所述的标签原料,其中所述的聚乙烯(A-2)具有约0.935g/cm3或更小的密度。
7.根据前述权利要求任何一项所述的标签原料,其中所述的聚乙烯(A-2)是线性低密度聚乙烯。
8.根据前述权利要求任何一项所述的标签原料,其中所述的聚乙烯(A-2)是乙烯和1-辛烯的共聚物。
9.根据前述权利要求任何一项所述的标签原料,其中所述的聚乙烯(A-2)具有约0.1到约10g/10min的熔体流动速率。
10.根据前述权利要求任何一项所述的标签原料,其中所述的膜还包括至少一种成核剂。
11.根据前述权利要求任何一项所述的标签原料,其中所述的膜(A)已在轴向通过拉伸被定向,拉伸比从约3:1到约10:1。
12.根据权利要求1-10任何一项所述的标签原料,其中所述的膜(A)已在轴向通过拉伸被定向,拉伸比从约6:1到约9:1。
13.根据前述权利要求任何一项所述的标签原料,其中粘合剂层是压敏粘合剂层。
14.根据前述权利要求任何一项所述的标签原料,其中所述的单层薄膜表面原料(A)的L+W MD刚度至少约20mN。
15.根据权利要求1-13任何一项所述的标签原料,其中所述的单层薄膜表面原料A的L+WMD刚度至少约28mN。
16.根据前述权利要求任何一项所述的标签原料,其中所述的单层薄膜表面原料(A)的MD刚度至少是其CD刚度的三倍。
17.根据权利要求1-15任何一项所述的标签原料,其中所述的表面原料(A)已被轴向定向和热定型。
18.可冲切和可印刷的包含粘合剂的标签原料,用于粘合剂标签,其包括:
(A)被挤压的轴向定向的单层薄膜表面原料,其具有上表面和下表面,并包括:
(A-1)按重量计约25至约80%的至少一种丙烯聚合物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2)按重量计约20至约75%的聚乙烯,其密度约0.935或更小
其中,所述的轴向定向膜是通过在轴向上拉伸被挤压的膜而得到,比例为从约6:1到约9:1,拉伸温度从约聚乙烯的熔解温度到丙烯聚合物或共聚物的熔解温度,和
(B)粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘合地连接到表面原料的下表面。
19.根据权利要求18所述的标签原料,其中(A-1)是丙烯均聚物,其具有约1到约20g/10min的熔体流动速率。
20.根据权利要求18或19所述的标签原料,其中(A-2)是乙烯-丁烯共聚物、乙烯-己烯共聚物、乙烯-辛烯共聚物或它们两种或两种以上的混合物。
21.根据权利要求18或19所述的标签原料,其中(A-2)是乙烯-辛烯共聚物。
22.根据权利要求18-21任何一项所述的标签原料,其中所述的聚乙烯(A-2)具有约0.2到约10g/10min的熔体流动速率。
23.根据权利要求18-22任何一项所述的标签原料,其中所述的丙烯聚合物或共聚物(A-1)和所述的聚乙烯(A-2)具有在温度和剪切速率的挤压条件下大约相同的粘度。
24.根据权利要求18-23任何一项所述的标签原料,其中所述的膜(A)具有约20至约50mN的L&W MD刚度。
25.根据权利要求18-23任何一项所述的标签原料,其中所述的膜(A)具有约28-50mN的L&W MD刚度。
26.根据权利要求18-25任何一项所述的标签原料,其中所述的表面原料(A)已被轴向定向和热变定。
27.粘合剂标签,其冲切自根据权利要求1-26任何一项所述的标签原料。
28.用于制备可冲切和可印刷的包含粘合剂的标签原料方法,,其包括:
(A)挤压单层薄膜表面原料,其具有上表面和下表面,并包括由以下组成的混合物:
(A-1)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的被挤压的膜,拉伸温度在约或超过聚乙烯的熔解温度至丙烯聚合物或共聚物的熔解温度,
(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到薄膜下表面。
29.根据权利要求28所述的方法,其中所述的被挤压的膜在轴向上被定向拉伸,拉伸比从约6:1到约10:1。
30.根据权利要求28或29所述的方法,其中所述的拉伸定向膜在应用所述的粘合剂层之前被热定型。
31.根据权利要求28-30任何一项所述的方法,其中所述的聚乙烯具有约0.935g/cm3或更小的密度。
32.根据权利要求28-31任何一项所述的方法,其进一步包括在粘合剂标签原料里冲切标签之前,将释放衬垫应用于粘合剂层下表面。
33.根据权利要求32所述的方法,其中粘合剂层和释放衬垫在一个步骤里应用,通过将在一侧涂布粘合剂层的释放衬垫的粘合剂一侧应用于膜下表面。
34.可冲切和可印刷的包含粘合剂的标签原料,用于粘合剂标签,其包括:
(A)轴向定向的多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯均聚物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层与所述的底层表面接触,,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯其中,所述的轴向定向薄膜是通过在轴向上拉伸被挤压的薄膜而得到,拉伸温度从约聚乙烯的熔解温度到丙烯聚合物或共聚物的熔解温度,和
(B)粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘合地连接到所述的表面原料下表面。
35.根据权利要求34所述的标签原料,其中所述的表面原料被轴向定向和热定型。
36.根据权利要求34或35所述的标签原料,其中至少(A-1)和(A-2b)其中一项所述的聚乙烯,具有约0.935g/cm3或更小的密度。
37.制备冲切轴向定向薄膜标签的方法,其包括:
(A)共挤压多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层与所述的底层表面接触,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的被挤压的薄膜,拉伸温度在约或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,
(C)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到所述的多层薄膜下表面。
(D)将释放衬垫应用于所述的粘合剂层下表面,和
(E)在所述的粘合剂标签原料里冲切标签。
38.根据权利要求37所述的方法,其中所述的拉伸定向薄膜是在应用所述的粘合剂层之前被热定型。
39.根据权利要求37或38所述的方法,其中所述的至少(A-1)和(A-2b)其中一项的聚乙烯,具有约0.935g/cm3或更小的密度。
40.用于制备轴向定向的多层薄膜标签原料的方法,其包括
(A)制备多层薄膜表面原料,其包括:
(A-1)底层,其包括至少一种丙烯聚合物或共聚物和聚乙烯聚合物的混合物,并具有上表面和下表面
(A-2)至少一个表层与所述的底层表面接触,其中所述的表层包括由以下组成的混合物
(A-2a)按重量计约25%至约80%的至少一种丙烯均聚物或共聚物或至少一种丙烯均聚物和至少一种丙烯共聚物的掺合物,和
(A-2b)按重量计约20%至约75%的至少一种聚乙烯
(B)在轴向拉伸定向所述的多层薄膜,拉伸温度在约或超过聚乙烯的熔解温度至丙烯均聚物或共聚物的熔解温度,
(C)退火所述的拉伸定向膜,和
(D)应用粘合剂层,其具有上表面和下表面,其中所述的粘合剂层上表面被粘连到所述的多层薄膜下表面。
41.根据权利要求40所述的方法,其中至少(A-1)和(A-2b)其中一项所述的聚乙烯,具有约0.935g/cm3或更小的密度。
42.根据权利要求34所述的标签原料,其中所述的底层丙烯含量大于所述的表层或多个表层的丙烯含量。
43.根据权利要求37-41任何一项所述的方法,其中所述的底层丙烯含量大于所述的表层或多个表层的丙烯含量。
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EP2049333A1 (en) 2009-04-22
BRPI0711963A2 (pt) 2012-01-17
CN101466543B (zh) 2014-03-19
US20090130360A1 (en) 2009-05-21
US20170226383A1 (en) 2017-08-10
WO2007146986A1 (en) 2007-12-21
WO2007146986B1 (en) 2008-02-07
US9662867B2 (en) 2017-05-30
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BRPI0711963B1 (pt) 2019-09-17
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