CN1246134A - 取向共挤薄膜 - Google Patents
取向共挤薄膜 Download PDFInfo
- Publication number
- CN1246134A CN1246134A CN98802126A CN98802126A CN1246134A CN 1246134 A CN1246134 A CN 1246134A CN 98802126 A CN98802126 A CN 98802126A CN 98802126 A CN98802126 A CN 98802126A CN 1246134 A CN1246134 A CN 1246134A
- Authority
- CN
- China
- Prior art keywords
- film
- polypropylene
- ethylene copolymer
- layer
- skin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered 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
- B32B27/08—Layered 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
- C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2314/00—Polymer mixtures characterised by way of preparation
- C08L2314/06—Metallocene or single site catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Manufacturing & Machinery (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Wrappers (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
本发明为一种取向多层薄膜,包括至少一层外层,所述外层包括占所述外层的50至100%(重)的密度为0.900—0.935g/cm3和CDBI为50—95%的乙烯共聚物,所述外层与聚丙烯芯层接触,通过共挤所述乙烯共聚物和所述聚丙烯层然后取向制备所述薄膜。所述共挤层可在绷架拉伸设备上单轴或双轴取向,没有传统齐格勒-纳塔型线性低密聚乙烯中固有地存在低分子量无定形聚合物馏分所导致的困难。保持双轴取向聚丙烯膜的光学性质,同时降低热合温度,改善热封合强度和热粘性。
Description
发明背景
发明领域
本发明涉及一种取向的多层膜,包括至少一层乙烯基聚合物。更具体地,本发明涉及多层薄膜,其中至少一层是乙烯基无规共聚物,所述薄膜在拉伸取向之前共挤塑。
现有技术
取向的多层薄膜是一类重要的工业产品,主要适用于包裹或包装各种商品。特别地,已知取向的全同立构聚丙烯薄膜因其高防护性能、透明度和劲度而尤为适用。用于取向薄膜的聚丙烯典型地为全同立构均聚物,或为用不同的全同立构聚丙烯(如不同熔体流动速率(MFR)或立构规整度)、无规立构聚丙烯、间同立构聚丙烯、有少量乙烯或更高α-烯烃的无规聚丙烯共聚物、和乙烯共聚物改性的全同立构聚丙烯的聚丙烯共混物,参见例如US4 950 720和WO96/02386。如US4921749及相关技术中所述,也可加入其它组分如石油树脂以改变诸如热合性、透气性和劲度等性能。这种取向聚丙烯特别是双轴取向聚丙烯(BOPP)有许多理想的性能。然而,其中没有极好的热粘性和热合性,因为这种薄膜在适用于有效工业实施的操作温度下缺少重要的热合性和热粘性。
因此,已使用或提出各种聚合物层作为双轴取向聚丙烯薄膜的热合层。其中工业应用且在专利文献中教导的是聚烯烃,基于乙烯和丙烯。过去优选用于BOPP的热合层典型地是高丙烯含量的聚烯烃,例如有1-20%(重)乙烯的丙烯-乙烯共聚物、乙烯和丁烯最多各约10%(重)的丙烯-乙烯-丁烯三元共聚物、及其与其它烯烃聚合物的共混物。参见例如US4 643 945(LLDPE与丙烯的三元共聚物)和US4 921 749(丙烯-乙烯共聚物)及前面所列的其它文献。选择这些聚合物来降低热合层和芯层的化学异同性使它们之间良好粘结,但导致需要随后在约120℃或高于约120℃的温度下进行热合,需要与加热元件长时间接触或高热输入以达到所需温度范围。
发明概述
本发明涉及一种取向多层薄膜,包括至少一层外层,所述外层包括占所述外层的50至100%(重)的密度为0.900-0.935g/cm3和CDBI为50-95%的乙烯共聚物,所述外层与聚丙烯芯层接触,通过共挤所述乙烯共聚物和所述聚丙烯层然后取向制备所述薄膜。优选所述乙烯共聚物外层或皮层的MWD(Mw/Mn)为1.8-3.5和MI为0.5-10(ASTM D1238,190℃,2.16kg)。所述共挤层可在绷架拉伸设备上双轴取向,没有传统齐格勒-纳塔型线性低密度聚乙烯中固有地存在低分子量无定形聚合物馏分所导致的困难。基本上消除不希望的加工中与转鼓和夹具粘着及所制膜中存在可萃取物的问题。保持双轴取向聚丙烯膜(BOPP)的光学性质,同时降低热合温度,改善热封合强度和热粘性。因此该乙烯共聚物热封合层为制备用于所有硬、软和可热缩包装的改善的热合BOPP提供经济实用的解决方法。
附图简述
图1为实施例的膜的热合和热粘性曲线图。
发明详述
适用于本发明的乙烯共聚物可商购,并可由基本上单一位的催化剂如金属茂催化剂制备。本文所用术语“基本上单一位的催化剂”意指提供窄分子量分布(MWD)(Mw/Mn)和窄组成分布(通过组成分布宽度指数CDBI计量)的任何烯烃聚合催化剂。商购产品具体地包括由Exxon Chemical Co.,Houston,Texas以EXCEED 350D60(乙烯-己烯共聚物,MI=1.0,密度0.917g/cm3)和377L60(乙烯-己烯共聚物,MI=1.0,密度0.922)出售的金属茂LLDPE树脂(m-LLDPE),及Exxon Chemical Co.以商标EXACT出售和Dow Chemical Company,Midland,Michigan以AFFINITY出售的金属茂塑性体乙烯共聚物,这种塑性体的密度为或高于约0.900。典型的乙烯共聚物包括作为共聚单体的任何C3-C12α-烯烃,优选一或多种C4-C8α-烯烃。共聚单体的含量由所测量的密度确定,密度优选在0.910至0.925g/cm3的范围内,最优选0.915至0.925g/cm3。以MI(聚乙烯熔体指数,ASTMD 1238)计量本发明乙烯共聚物的优选分子量在约0.7-8.0的范围内,最优选0.7-5.0。MWD典型地为约2.0-3.5,优选2.0-2.7。CDBI优选高于约55%,最优选高于65%。适用的乙烯共聚物的熔体指数比(MIR,I21/I2)典型地在约16至约50的范围内。适用于薄膜的乙烯共聚物的其它描述可参见1996年11月22日申请的共同待审美国专利申请No.08/755 105,其描述引入本文供参考。
适用作本发明热合层的其它乙烯共聚物组合物包括聚乙烯共混组合物,其中前面所定义的乙烯共聚物占至少50%(重),其余为较少量的基本上相容的乙烯基均聚物或包括乙烯与一或多种C3-C12α-烯烃、环烯烃、乙烯基芳烃和极性乙烯基单体如降冰片烯、烷基取代的降冰片烯、苯乙烯、烷基取代的苯乙烯、乙酸乙烯酯、丙烯酸、丙烯酸甲酯、丙烯酸丁酯等的共聚物。包括乙烯-α-烯烃共聚物的共混组合物优选为总密度为约0.910至约0.925和MI为约0.7至5.0的那些。对于包括其它乙烯共聚物的共混物,共聚物优选为有2-5%(摩尔)共聚单体和等量MI的那些。具体的共混聚乙烯包括通过齐格勒-纳塔型聚合、基本上单一位的配位聚合、和高压自由基聚合制备的任何LDPE、塑性体、LLDPE、MLDPE或HDPE(本领域中使用的那些术语)。含乙烯基单体的聚合物包括乙烯-乙烯基(EVA)、乙烯-乙烯醇(EVOH)、乙烯-丙烯酸(EAA)、乙烯-丙烯酸甲酯(EMA)等。适用于共混的乙烯共聚物是乙烯含量足以提供确保所述共混组合物在冷却时共混组合物内不发生严重的相分离的乙烯结晶度。
结晶度较低因而密度在或低于约0.915(“VLDPE”)的共聚物,包括某些密度为约0.870至约0.915g/cm3的与C4-C8α-烯烃的塑性体乙烯共聚物特别适用作共混组分,以足以使线速增加的量存在,因为存在熔点较低的低密度共聚物。VLDPE共聚物的存在量优选最多约30%(重),更优选约15-20%(重)。VLDPE及其在薄膜应用中的用途的进一步描述出现在US5 206 075和5 358 792中,这两篇专利均引入本文供参考。
适用的聚丙烯芯层或外层包括已知适用作单轴或双轴取向薄膜的任何全同立构聚丙烯组合物或共混物。背景技术是有益的,引入本文供参考。传统的齐格勒-纳塔型聚丙烯树脂和较新的基本上单一位催化剂的那些均适用,只要有足以确保熔体粘度匹配适用于共挤出的分子量。因此熔体流动速率“MFR”(ASTM D 1238,230℃,2.16kg)为约1.0至约40、优选至10、最优选至6.0的丙烯聚合物是适用的。薄膜级聚丙烯产品Exxon Chemical Co.的ESCORENEPP4592 E7、PP4372和PP 4252 E1特别适用。此外,最多含约15%(摩尔)至少一种非丙烯C2-C8α-烯烃的聚丙烯无规共聚物适用作为可共挤的聚丙烯层,作为芯层、外层或中间层。
共挤薄膜的制备方法为本领域所公知。对于本发明,适用作热合层的乙烯共聚物组合物和聚丙烯组合物分别但同时挤出并在取向之前接合用于共挤塑。因为优选乙烯共聚物或包括该共聚物的共混物的熔体粘度很高足以在挤出聚丙烯薄膜所需工艺温度下保持足够的尺寸稳定性,所以可保持厚和薄膜膜表面的厚度均匀。该乙烯共聚物组合物无低分子量的无定形馏分和熔点足够高可在不粘附于加工设备的情况下极好加工,同时仍保持特别适用的尺寸稳定性。
本发明薄膜的优选制备方法包括共挤法,随后使共挤物取向。虽然工业上已知低熔点聚合物可通过涂布法施涂,其中聚合物以熔融或软化态挤在预成型的较高软化点的聚合物膜上,还已知使用化学上不同的聚合物可能导致层间不够粘。因此,要复合两种不同聚合物时通常推荐使用能粘结两层的补充粘结层(或粘合层)。参见例如J.Stepek,et al,作为包装材料的聚合物(Polymers As Materials ForPackaging),Ch.5,p.346-349(Ellis Horwood Ltd.,1987,English language edition)。
然而,本发明经过观察研究发现:以两或多股物流使用共挤复式挤出机,其中至少一股物流提供所述乙烯共聚物组合物,另一物流提供聚丙烯组合物,同时加入多流道模头使两层相互接触进行缝型模挤塑,然后取向,可在不需补充粘结或粘合层而保持层间极好的粘合和极好的复合薄膜性能的情况下制备薄膜。保持BOPP的极佳透明度,同时降低热合起始温度并在总强度方面增加薄膜的密封性能而不必施加足以软化聚丙烯层的热量。由于本发明热合层聚合物的软化点为约80至100℃,熔点在约100和120℃之间,有效热合温度低于典型的丙烯共聚物热合层,可更快速地加工而增加生产使用中的生产线速度。
本发明薄膜特别包括取向的有热合层A和聚丙烯外层B的双层A/B薄膜,或在聚丙烯芯层B两侧有两层热合层A的三层A/B/A薄膜。附加层或对B层中薄膜进行处理也适用,已知的处理如金属取代或电晕放电处理,加入其它防渗层或粘结层也为本领域所公知,可任意组合用于具体商品。热合层A可在多层薄膜的一侧,可用作另一芯层,或在两侧形成补充热合层。这些复合薄膜都得益于A和B层的粘结改善和复合的层压薄膜对于取向的相容性,特别是单轴取向和双轴取向,如利用绷架拉伸取向法。此外,宽平稳态的热合温度即约110-140℃为精确温控不经济而不适用的工业过程提供显著优点。这两层一起加压和加热形成的热合经受约0.6-3.0lbs的断裂力时因在所述平稳区内剥离可能很不合格。此失败机理为适用于包装业特别是软包装的可剥离性密封提供了极佳特性。通过增加本文所列举的热合层的厚度,和或通过引入一或多个附加共挤粘结或粘合层如包括乙烯或丙烯共聚物的那些,可获得较高的剥离强度(>3.0lb.,例如3.0-6.0lb.)。
本申请中所示聚合物特征是在以下条件和方法下进行。MI按ASTMD1238中所述测量。Mw、Mn、Mw/Mn(MWD)均通过凝胶渗透色谱法(GPC)测量,用DRI差示折射指数检测仪,即Waters 150C GPC仪与DRI检测仪。CDBI按WO93/03093的第7和8栏中所述方法测量。聚乙烯和聚丙烯的密度按ASTM D792测量。
实施例
I.TM Long试验:将共挤出结构流延在实验室Killion线上,然后在TM Long线上双轴取向(6×6)制备2层A/B薄膜和3层ABA薄膜,分别包括一和两层最终厚度0.2mil的热合层和0.4厚的聚丙烯芯层。所述乙烯共聚物热合层由EXCEED350D60或377L60树脂挤出,聚丙烯层由PD4252E1挤出,均购自Exxon Chemical Co.。
II.中试生产线试验:在Black Clawson生产线上制备下表1-4的薄膜,在下表1-3中所述绷架上双轴取向。薄膜的性能示于表4中。
表1
用Black Clawson Line制膜的工艺信息* | |||||
A/B 10/90(重量比) | A/B/A 10/80/10(重量比) | ||||
350D60PD4252E1 | 377L60PD4252E1 | A 377L60 B PD4252E1 | |||
薄膜厚度(mils) | 10 | 20 | 10 | 20 | 10 |
A-层:屏障型螺杆:B挤塑机 | |||||
螺杆速度(RPM) | 8 | 8 | 15 | ||
挤出量(lb./hr) | 47 | 47 | 92 | ||
熔体温度(°F/℃) | 550/ | 559/ | 560/ | ||
负载(Amps) | 67 | 56 | 107 | ||
电压 | 25 | 22 | 41 | ||
机头压力(psi/kPa) | 1847 | 1715 | 2950 | ||
B-层:计量型螺杆:A挤塑机 | |||||
螺杆速度(RPM) | 151 | 141 | 131 | ||
挤出量(lb./hr) | 423 | 423 | 368 | ||
熔体温度(°F/℃) | 586 | 585 | |||
负载(Amps) | 128 | 128 | 123 | ||
电压 | 469 | 431 | 406 | ||
机头压力(psi) | 4100 | 4266 | 4186 | ||
挤出量(磅/小时) | |||||
总 | 470 | 470 | 460 | ||
线速(FPM) | |||||
50 | 27 | 43 |
*所有薄膜的螺杆速度和比挤出量相同。3.5inch 30∶1 L/D,42inch Wide Die。Air Knife Pinning。主骤冷辊为87°F(℃),副骤冷辊为75°F(℃)。调节线速获得要求的薄膜厚度。其它所有工艺条件不变。
表2
用于流延薄膜的MD条件* | |||
共挤薄膜 | A/B 10/90 | A/B/A 10/80/10 | |
350D60/PD4252E1 | 377L60/PD4252E1 | A 377L60/B PD4252E1 | |
辊温(°F) | |||
预热 | 270 | ||
慢拉 | 265 | ||
快拉 | 265 | ||
退火 | 250 | ||
冷却 | 68 | ||
MD牵伸 | |||
4/5 | 5 | 5 |
*拉伸缝隙0.032inch。调节牵伸速度获得要求的MD牵伸比。
表3
用于流延薄膜的TD取向条件 | ||||
共挤薄膜 | A/B 10/90 | A/B/A 10/80/10 | ||
350D60/PD4252E1 | 377L60/PD4252E1 | A 377L60B PD4252E1 | ||
初始膜厚(mils) | 10 | 20 | 10 | 20 |
烘箱温度 | ||||
预热 | 315° | |||
拉伸 | 315° | |||
退火 | 300° | |||
线速(ft/min) | ||||
60 | 20 | 60 | 50 | |
TD牵伸 | ||||
6 | 8 | 6 | 6 |
表4双轴取向共挤薄膜的薄膜性能
膜结构 | A/B 10/90 | A/B/A10/80/10 | ||||
典型物质 | 350D60/PD4252E1 | 377L60/PD4252El | A 377L60/B PD4252E1 | |||
初始膜厚(mils) | 10 | 20 | 10 | 10 | 20 | 10 |
MD/TD牵伸比* | ||||||
工程 | 4∶6 | 5∶9 | 3∶8 | 4∶8 | 5∶8 | 5∶6 |
厚度测微计(mils) | ||||||
试验区域均值 | 0.28 | 0.33 | 0.29 | 0.25 | 0.43 | 0.32 |
Measuretech Profiler | ||||||
膜厚均值(mils) | 0.27 | 0.33 | 0.35 | 0.22 | 0.39 | 0.31 |
低 | 0.20 | 0.20 | 0.29 | 0.18 | 0.34 | 0.24 |
高 | 0.39 | 0.54 | 0.52 | 0.28 | 0.58 | 0.43 |
落镖法A | ||||||
(g) | 228 | 168 | 168 | 181 | 263 | 275 |
(g/mil) | 814 | 509 | 579 | 724 | 612 | 859 |
穿刺(内)*** | ||||||
最大力(lb.) | 15.09 | 17.13 | 14.87 | 12.57 | 22.83 | 14.85 |
最大力(lb./mil) | 53.90 | 51.90 | 51.28 | 50.26 | 53.09 | 46.41 |
最高能量(in-lb.) | 7.60 | 5.17 | 7.07 | 4.72 | 7.43 | 8.54 |
最高能量(in-lb./mil) | 27.13 | 15.67 | 24.37 | 18.86 | 17.28 | 26.70 |
穿刺(外)*** | ||||||
最大力(lb.) | 11.34 | 14.62 | 9.75 | 10.04 | 18.05 | 15.02 |
最大力(lb./mil) | 40.51 | 44.31 | 33.62 | 40.15 | 41.97 | 46.94 |
最高能量(in-lb.) | 4.89 | 4.09 | 3.67 | 3.38 | 5.73 | 8.88 |
最高能量(in-lb./mil) | 17.48 | 12.40 | 12.64 | 13.50 | 13.33 | 27.75 |
拉伸@屈服(psi) | ||||||
MD | 6 882 | 6 985 | 6 673 | 7 233 | 7 560 | 5 430 |
TD | 15 111 | 42 866 | 24 924 | 27 599 | 38 341 | 11 954 |
200%MD | 0 | 0 | 11 461 | 0 | 0 | 0 |
表4(续)双轴取向共挤薄膜的薄膜性能
极限拉伸(psi) | ||||||
MD | 19 029 | 19 231 | 12 937 | 18 846 | 23 621 | 16 046 |
TD | 34 750 | 65 936 | 45 231 | 47 845 | 66 173 | 25 988 |
伸长@屈服(%) | ||||||
MD | 4.1 | 4.3 | 4.2 | 4.2 | 4.5 | 4.2 |
TD | 5.9 | 5.6 | 5.3 | 5.6 | 5.9 | 5.8 |
断裂伸长率(%) | ||||||
MD | 133 | 140 | 239 | 155 | 142 | 145 |
TD | 26 | 15 | 17 | 19 | 21 | 31 |
初始膜厚(mils) | 10 | 20 | 10 | 10 | 20 | 10 |
1%正割(psi) | ||||||
MD | 304 830 | 337 830 | 318 670 | 303 170 | 349 000 | 278 170 |
TD | 461 330 | 1 153 670 | 748 670 | 788 170 | 975 330 | 383 330 |
埃尔曼多夫撕裂** | ||||||
MD(g) | 1 | 2 | 2 | 1 | 2 | 2 |
MD(g/mil) | 4 | 6 | 6 | 5 | 5 | 6 |
TD(g) | 0 | 1 | 0 | 0 | 1 | 1 |
TD(g/mil) | 0 | 3 | 0 | 0 | 2 | 3 |
收缩率(%) | ||||||
MD | 57 | 58 | 58 | 64 | 72 | 42 |
TD | 79 | 82 | 88 | 86 | 86 | 71 |
雾度(%) | 0.63 | 0.77 | 1.07 | 0.97 | 0.97 | 1.20* |
光泽度(45) | 93 | 90 | 88 | 87 | 88 | 92* |
COF(kf) | ||||||
(I/I) | 无试样 | 0.49 | 0.46 | 0.43 | 0.39 | >1.0 |
(I/O) | 0.51 | 0.43 | 0.40 | 0.40 | ||
(O/O) | 0.52 | 0.53 | 0.49 | 0.44 | ||
WVTR(gm×mil/100″sq/day) | 0.34 | 0.35 |
*工程牵伸比在试验期间测定。实际牵伸比由产生的薄膜测定。
**撕裂值是基于使用200g摆锤。ASTM规定要由20-60%摆锤重之间的读数获得撕裂值。该撕裂值太低,这是不可能的。
***使用2个HDPE热合滑润垫片。
III.共挤和流延一2层粘带,然后双轴取向,制备以下实施例1-4的薄膜。流延是在Black-Clawson作业线上进行,取向是在中试绷架拉伸生产线上进行。表5中描述了所得薄膜,表6中概括了中试绷架拉伸生产线上使薄膜取向所用条件。
该共挤薄膜的性能与无热合层的双轴取向聚丙烯薄膜相似。例如,该产品保持了极好的光学性质(雾度和光泽度),埃尔曼多夫撕裂基本相等(0.10g/mil)。乙烯共聚物热合层仅0.03至0.12mil(0.7-3.0μ),但显微镜观察表明该热合层与聚丙烯一致牵伸。沿纵向(MD)和横向(TD)测量热粘性和热合性能,参见图1。虽然高度取向,所加入的封合仍表现出极好的外观而无可观察到的收缩。对于这些实施例,在工业上完全可接受的中等力度下出现封合失败,失败机理主要是因剥离而非撕裂或断裂。在列举的中等力度水平下失败的方式说明对许多包装应用中要求可剥离密封的实用性。热粘性测量结果(也在图1中)说明在110-120℃之间有适用的热封合值,明显优于包括聚丙烯共聚物的热合层所要求的那些温度。
表5
A/B共挤结构的实例
在中试绷架拉伸生产线上双轴取向
共挤试样# | m-LLDPE | 聚丙烯 | 取向,TD×MD | 最终膜厚,mil |
1 | 10%350D60 | 90%PD4252E1 | 5×9 | 0.33 |
2 | 10%377L60 | 90%PD4252E1 | 5×8 | 0.39 |
3 | 10%350D60 | 90%PD4252E1 | 4×6 | 0.27 |
4 | 10%377L60 | 90%PD4252E1 | 3×8 | 0.35 |
表6b.MD取向
共挤试样# | En’g.取向 | 薄膜输入速度,ft/s(m/s) | 预热辊,℃ | 牵引辊,℃ | 退火辊,℃ | 骤冷辊,℃ |
1 | 5 | 10( ) | 132 | 126 | 120 | 21 |
2 | 5 | 10( ) | 132 | 126 | 120 | 21 |
3 | 4 | 10( ) | 132 | 126 | 120 | 21 |
4 | 3 | 10( ) | 132 | 126 | 120 | 21 |
表6b.TD取向
共挤试样# | Eng’g.取向 | 预热辊,℃ | 拉伸辊,℃ | 退火辊,℃ |
1 | 9× | 132 | 160 | 149 |
2 | 8× | 132 | 160 | 149 |
3 | 6× | 132 | 157 | 149 |
4 | 8× | 132 | 157 | 149 |
Claims (8)
1.一种取向多层薄膜,包括至少一层外层,所述外层包括密度为0.900-0.935g/cm3和CDBI为50-95%的乙烯共聚物占所述外层的50至100%(重),所述外层与聚丙烯芯层接触,通过共挤所述乙烯共聚物和所述聚丙烯层然后取向制备所述薄膜。
2.权利要求1的薄膜,其中所述薄膜双轴取向,所述乙烯共聚物的密度为0.910-0.935g/cm3,MWD为1.8-3.5,和MI为0.5-10。
3.权利要求2的薄膜,其中所述乙烯共聚物的密度为0.915-0.925g/cm3。
4.权利要求1的薄膜,其中所述外层为聚乙烯共混组合物,包括50-99%(重)所述乙烯共聚物和1-50%(重)基本上相容的乙烯基均聚物或包括乙烯与一或多种C3-C12α-烯烃、环烯烃、乙烯基芳烃和极性乙烯基单体的共聚物,所述共混组合物的总密度为约0.910至约0.925和MI为约0.7至5.0。
5.权利要求4的薄膜,其中所述基本上相容的乙烯基共聚物最多占总共混物的约30%(重),为包括一或多种C4-C8α-烯烃的密度约0.880至约0.915g/cm3的乙烯共聚物。
6.权利要求1的薄膜,其中所述聚丙烯层主要由全同立构聚丙烯均聚物或聚丙烯无规共聚物组成。
7.权利要求6的薄膜,包括两层所述外层和至少一层与所述外层至少之一接触的聚丙烯层。
8.权利要求1的薄膜,其中所述第二外层为聚丙烯。
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/806,182 US6094889A (en) | 1997-02-25 | 1997-02-25 | Method of form and seal packaging |
US84773097A | 1997-04-28 | 1997-04-28 | |
US90521197A | 1997-08-01 | 1997-08-01 | |
US08/806,182 | 1997-08-01 | ||
US08/847,730 | 1997-08-01 | ||
US08/905,211 | 1997-08-01 | ||
US5525397P | 1997-08-11 | 1997-08-11 | |
US60/055,253 | 1997-08-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
CN1246134A true CN1246134A (zh) | 2000-03-01 |
Family
ID=27489708
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN98802126A Pending CN1246134A (zh) | 1997-02-25 | 1998-02-24 | 取向共挤薄膜 |
Country Status (12)
Country | Link |
---|---|
EP (2) | EP0963408B1 (zh) |
KR (1) | KR20000075588A (zh) |
CN (1) | CN1246134A (zh) |
AT (1) | ATE326501T1 (zh) |
AU (1) | AU740922B2 (zh) |
BR (1) | BR9807499A (zh) |
CA (1) | CA2278364A1 (zh) |
DE (1) | DE69834551T2 (zh) |
ES (1) | ES2264199T3 (zh) |
NO (1) | NO994081L (zh) |
NZ (1) | NZ336351A (zh) |
WO (1) | WO1998037140A1 (zh) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011054133A1 (en) * | 2009-11-09 | 2011-05-12 | Exxonmobil Chemical Patents Inc. | Polymeric films and methods to manufacture same |
CN102079418A (zh) * | 2010-07-26 | 2011-06-01 | 刘燕 | 多层共挤仿纸液体包装膜 |
CN102139552A (zh) * | 2010-01-29 | 2011-08-03 | 何凌 | 聚丙烯双向拉伸薄膜及其制备方法 |
CN102190824A (zh) * | 2010-03-15 | 2011-09-21 | 江苏彩华包装集团公司 | 可热封功能性拉伸薄膜 |
WO2012058789A1 (en) * | 2010-11-05 | 2012-05-10 | Exxonmobil Chemical Patents Inc. | Polymeric films and methods to manufacture the same |
CN102686390A (zh) * | 2009-11-12 | 2012-09-19 | 巴培斯阿玛利亚有限公司 | 用于纸张的包装 |
CN102863919A (zh) * | 2011-07-04 | 2013-01-09 | 孟孟 | 无底涂聚丙烯双向拉伸薄膜及其制备方法 |
CN104736625A (zh) * | 2012-10-26 | 2015-06-24 | 埃克森美孚化学专利公司 | 聚合物共混物和由其制得的制品 |
CN105150648A (zh) * | 2015-09-21 | 2015-12-16 | 公主岭华美塑料制品有限公司 | 一种聚乙烯/聚丙烯/聚乙烯三层共挤上吹薄膜及其制备方法 |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6237308B1 (en) * | 1999-05-14 | 2001-05-29 | Glopak Inc. | High-speed pouch forming, sealing and filling machine, method of operation, and multi-layer film therefore |
US20020009579A1 (en) | 1999-05-17 | 2002-01-24 | Yves Quintin | Multi-layer film structure for use with a high-speed pouch forming, filling and sealing machine |
ES2181564B1 (es) * | 2000-12-27 | 2004-06-16 | Extrusion De Resinas Vinilicas, S.A. | Film termo-retractil. |
US20040105994A1 (en) * | 2002-12-03 | 2004-06-03 | Pang-Chia Lu | Thermoplastic film structures with a low melting point outer layer |
US20060068200A1 (en) | 2004-09-24 | 2006-03-30 | Cleckner Michael D | Surface-treated multi-layered polymer film |
US8617717B2 (en) | 2006-06-09 | 2013-12-31 | Exxonmobil Chemical Patents Inc. | Heat sealable films from propylene and α-olefin units |
GB0716457D0 (en) | 2007-08-23 | 2007-10-03 | Innovia Films Ltd | Naked collation package |
US20120034444A1 (en) | 2009-04-10 | 2012-02-09 | Dow Globel Technologies LLC | High performance sealable coextruded biaxially oriented polypropylene film |
SG11201605238UA (en) | 2013-12-31 | 2016-07-28 | Dow Global Technologies Llc | Multilayered films, methods of manufacture thereof and articles comprising the same |
US20150231862A1 (en) * | 2014-02-19 | 2015-08-20 | Dow Global Technologies Llc | Multilayered polyolefin films, methods of manufacture thereof and articles comprising the same |
WO2015123827A1 (en) | 2014-02-19 | 2015-08-27 | Dow Global Technologies Llc | High performance sealable co-extruded oriented film, methods of manufacture thereof and articles comprising the same |
US20150231861A1 (en) * | 2014-02-19 | 2015-08-20 | Dow Global Technologies Llc | Multilayered polyolefin films, methods of manufacture thereof and articles comprising the same |
CN104029452A (zh) * | 2014-05-21 | 2014-09-10 | 江苏优珀斯材料科技有限公司 | 增大摩擦系数的hdpe有色膜 |
AR102954A1 (es) | 2014-12-19 | 2017-04-05 | Dow Global Technologies Llc | Una estructura de capa múltiple, un método para producir la misma, y un envasado que comprende la misma |
CN105922689B (zh) * | 2016-05-05 | 2017-11-24 | 永新股份(黄山)包装有限公司 | 一种高粘度自粘性表面保护膜及其制造方法 |
AR113268A1 (es) * | 2017-10-10 | 2020-03-11 | Dow Global Technologies Llc | Películas poliméricas orientadas de manera uniaxial y artículos fabricados a partir de estas |
CN110128706B (zh) * | 2019-04-19 | 2022-01-07 | 广东中烟工业有限责任公司 | 一种可降解无规共聚bopp组合物及其应用 |
WO2021181167A1 (en) * | 2020-03-12 | 2021-09-16 | Braskem S.A. | Biaxially oriented polypropylene multilayer film and methods thereof |
WO2023069083A1 (en) * | 2021-10-20 | 2023-04-27 | Amcor Flexibles North America, Inc. | Packaging film |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
MX9200724A (es) * | 1991-02-22 | 1993-05-01 | Exxon Chemical Patents Inc | Mezcla termosellable de polietileno o plastomero de muy baja densidad con polimeros a base de polipropileno y pelicula termosellable asi como articulos hechos con aquellas. |
ES2122334T5 (es) * | 1993-11-12 | 2004-07-16 | Exxonmobil Chemical Patents Inc. | Peliculas termosellables y articulos fabricados a partir de las mismas. |
CA2202942A1 (en) * | 1996-04-19 | 1997-10-19 | Janet Rivett | Multilayer films having improved inter-layer adhesion |
EP0906181A1 (en) * | 1996-05-20 | 1999-04-07 | Union Camp Corporation | Coextruded blown film and products made using the same |
-
1998
- 1998-02-24 CN CN98802126A patent/CN1246134A/zh active Pending
- 1998-02-24 DE DE69834551T patent/DE69834551T2/de not_active Expired - Lifetime
- 1998-02-24 EP EP98910042A patent/EP0963408B1/en not_active Expired - Lifetime
- 1998-02-24 CA CA002278364A patent/CA2278364A1/en not_active Abandoned
- 1998-02-24 AT AT98910042T patent/ATE326501T1/de not_active IP Right Cessation
- 1998-02-24 ES ES98910042T patent/ES2264199T3/es not_active Expired - Lifetime
- 1998-02-24 AU AU64384/98A patent/AU740922B2/en not_active Withdrawn - After Issue
- 1998-02-24 BR BR9807499A patent/BR9807499A/pt not_active Application Discontinuation
- 1998-02-24 KR KR1019997007648A patent/KR20000075588A/ko not_active Application Discontinuation
- 1998-02-24 WO PCT/US1998/003562 patent/WO1998037140A1/en active IP Right Grant
- 1998-02-24 EP EP03075729A patent/EP1318173A1/en not_active Withdrawn
- 1998-02-24 NZ NZ336351A patent/NZ336351A/xx unknown
-
1999
- 1999-08-24 NO NO994081A patent/NO994081L/no not_active Application Discontinuation
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011054133A1 (en) * | 2009-11-09 | 2011-05-12 | Exxonmobil Chemical Patents Inc. | Polymeric films and methods to manufacture same |
CN102686390B (zh) * | 2009-11-12 | 2016-03-09 | 巴培斯阿玛利亚有限公司 | 用于纸张的包装 |
CN102686390A (zh) * | 2009-11-12 | 2012-09-19 | 巴培斯阿玛利亚有限公司 | 用于纸张的包装 |
CN102139552A (zh) * | 2010-01-29 | 2011-08-03 | 何凌 | 聚丙烯双向拉伸薄膜及其制备方法 |
CN102139552B (zh) * | 2010-01-29 | 2014-03-12 | 何凌 | 聚丙烯双向拉伸薄膜及其制备方法 |
CN102190824A (zh) * | 2010-03-15 | 2011-09-21 | 江苏彩华包装集团公司 | 可热封功能性拉伸薄膜 |
CN102079418A (zh) * | 2010-07-26 | 2011-06-01 | 刘燕 | 多层共挤仿纸液体包装膜 |
CN102079418B (zh) * | 2010-07-26 | 2014-03-26 | 刘燕 | 多层共挤仿纸液体包装膜 |
WO2012058789A1 (en) * | 2010-11-05 | 2012-05-10 | Exxonmobil Chemical Patents Inc. | Polymeric films and methods to manufacture the same |
CN102863919A (zh) * | 2011-07-04 | 2013-01-09 | 孟孟 | 无底涂聚丙烯双向拉伸薄膜及其制备方法 |
CN104736625A (zh) * | 2012-10-26 | 2015-06-24 | 埃克森美孚化学专利公司 | 聚合物共混物和由其制得的制品 |
CN104736625B (zh) * | 2012-10-26 | 2018-07-20 | 埃克森美孚化学专利公司 | 聚合物共混物和由其制得的制品 |
CN105150648A (zh) * | 2015-09-21 | 2015-12-16 | 公主岭华美塑料制品有限公司 | 一种聚乙烯/聚丙烯/聚乙烯三层共挤上吹薄膜及其制备方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1318173A1 (en) | 2003-06-11 |
NO994081L (no) | 1999-10-25 |
DE69834551T2 (de) | 2007-05-03 |
ES2264199T3 (es) | 2006-12-16 |
CA2278364A1 (en) | 1998-08-27 |
NZ336351A (en) | 2001-01-26 |
EP0963408B1 (en) | 2006-05-17 |
NO994081D0 (no) | 1999-08-24 |
AU740922B2 (en) | 2001-11-15 |
WO1998037140A1 (en) | 1998-08-27 |
AU6438498A (en) | 1998-09-09 |
ATE326501T1 (de) | 2006-06-15 |
BR9807499A (pt) | 2000-03-21 |
EP0963408A1 (en) | 1999-12-15 |
KR20000075588A (ko) | 2000-12-15 |
DE69834551D1 (de) | 2006-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN1246134A (zh) | 取向共挤薄膜 | |
US6423420B1 (en) | Oriented coextruded films | |
JP5883360B2 (ja) | 積層フィルム組成物、それらから作製される包装品、および使用方法 | |
JP6284685B2 (ja) | ポリマー組成物および押出被覆された物品 | |
JP2001513035A (ja) | 延伸され、同時押出されたフィルム | |
AU762522B2 (en) | Multi-layer film with enhanced lamination bond strength | |
US8709610B2 (en) | Biaxially oriented film which could be thermally laminated with paper and other substrates | |
JP6030947B2 (ja) | ポリオレフィン系無延伸多層フィルム | |
MXPA02005888A (es) | Composiciones a base de polipropileno y peliculas y etiquetas formadas a partir de ellas. | |
JP6457402B2 (ja) | ポリオレフィン系無延伸多層フィルム | |
EP2780414B1 (en) | Polymeric blends and methods of using same | |
US20140004336A1 (en) | Polyolefin laminate film for cardboard lamination | |
JPWO2012063914A1 (ja) | ポリオレフィン複合フィルム | |
JP4529100B2 (ja) | 表面保護フィルム | |
JP4588490B2 (ja) | 樹脂組成物およびそれから得られる延伸フィルム | |
JP2020007443A (ja) | 食品用包装フィルムおよび食品用包装体 | |
JP3132373B2 (ja) | 多層フィルム | |
JP3160221B2 (ja) | ポリエチレン系多層フィルム | |
KR100531256B1 (ko) | 폴리올레핀계 공압출 연신 폴리프로필렌(opp) 필름 | |
JP2001071431A (ja) | 多層延伸ポリプロピレン系フィルム | |
JP3199160B2 (ja) | 線状低密度ポリエチレン系複合フイルム | |
TW200406423A (en) | Polypropylene-based wrap film | |
CN104023975B (zh) | 可挤压并可适形的取向聚丙烯标签 | |
US11708483B2 (en) | Heat sealable films | |
WO2023032580A1 (ja) | 多層フィルム、包装材及び包装体 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
WD01 | Invention patent application deemed withdrawn after publication |