CN1965046B - 增强液体调色剂对聚合物基材粘附性的底漆涂料 - Google Patents

增强液体调色剂对聚合物基材粘附性的底漆涂料 Download PDF

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CN1965046B
CN1965046B CN2005800182329A CN200580018232A CN1965046B CN 1965046 B CN1965046 B CN 1965046B CN 2005800182329 A CN2005800182329 A CN 2005800182329A CN 200580018232 A CN200580018232 A CN 200580018232A CN 1965046 B CN1965046 B CN 1965046B
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R·库珀
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Abstract

提供底漆涂料用于聚合物基材上以增强液体调色剂对电子照相印刷设备中印刷用基材的粘附性。该底漆涂料是水性的，并且包括乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体和选自脂族聚氨酯分散体、氢化烃松香或松香酯分散体和无定形的丙烯酸类聚合物分散体的相容性粘附增强剂。该涂料也可以包括添加剂如湿润剂、防粘连剂、消光剂和蜡。该底漆涂料可以涂覆于各种各样的聚合物基材上，这些基材包括聚丙烯、双轴取向的聚丙烯、聚对苯二甲酸乙二醇酯和聚氯乙烯。

Description

增强液体调色剂对聚合物基材粘附性的底漆涂料
本发明涉及在聚合物基材上使用的底漆涂料，更具体地说，涉及增强液体调色剂对聚合物薄膜的粘附性的底漆涂料，设计该聚合物薄膜以使用电子照相印刷设备来印刷。
近年来，利用液体电子照相体系的请求式数字印刷机的使用已变得普遍。在此类体系中，液体调色剂图像形成于光敏滚筒上，然后电转移到中间转移橡皮布(blanket)或带上以在纸或聚合物薄膜片或薄膜幅上印刷。供静电印刷机使用的液体调色剂的实例在美国专利No.5,407,771中进行了描述，使用此类液体调色剂的印刷机可以从惠普公司以商品名HP Indigo商购。因为聚合物薄膜是防潮、挠性的并且可以是透明或不透明的，所以与纸相比它们通常优选用在静电成像中。然而，液体调色剂无法较好地转移和/或较好地粘附到此类薄膜或纸基材上，除非它们已采用涂料或底漆处理(也称为“优化”)来增强液体调色剂的粘附性。已开发出许多涂料或底漆用于基材如聚合物薄膜，它们使薄膜的表面更易于接纳液体调色剂。例如，已知呈溶液态的聚酰胺树脂可用在此类聚合物薄膜上。然而，因为聚酰胺溶于溶剂中，当溶剂蒸发时，这可能导致环境问题。另外，该溶液在低温下难以处理，原因在于聚酰胺往往损失溶解性。在印刷之前，该涂料在储存中也具有有限的保存期限。
已开发出基于乙烯-丙烯酸共聚物的其它涂料。如美国专利No.5,789,123所述，基于乙烯-丙烯酸共聚物的涂料用来增强液体调色剂对聚合物基材如双轴取向的聚丙烯、聚对苯二甲酸乙二醇酯和聚氯乙烯的粘附性。然而，基于乙烯-丙烯酸共聚物的涂料必须连同附加的预涂料(precoating)一起使用，后者要求用来在该涂料和聚合物基材之间形成粘结。
因此，本领域仍需要一种底漆涂料，其能够为各种各样的聚合物基材提供良好的液体调色剂粘附性而不需要施涂附加的预涂料，其在宽的温度范围内是稳定的并且易于处理，并且具有延长的保存期限。
本发明的实施方案通过提供在各式各样的聚合物基材如聚丙烯、双轴取向的聚丙烯(BOPP)、聚对苯二甲酸乙二醇酯、聚酰胺、双轴取向的聚酰胺和聚氯乙烯上使用的底漆涂料来满足那些需要。该涂料在不需要附加的预涂料的情况下为这些聚合物基材提供增强的液体调色剂粘附性，尤其是为使用电子照相印刷设备印刷的那些基材。
根据本发明的一个方面，提供用于增强液体调色剂对聚合物基材粘附性的底漆涂料。该底漆涂料包含以下物质的混合物：乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体；和选自脂族聚氨酯乳液、氢化烃松香或松香酯乳液和无定形的丙烯酸类聚合物乳液的相容性粘附增强剂。所谓的“粘附增强剂”是指该组分可增强涂料对该涂料涂覆的基材的粘附性。
底漆涂料优选还包括湿润剂，后者优选选自醇和表面活性剂。该底漆涂料也优选包括消光剂。该消光剂可以包括，例如，无定形二氧化硅。
底漆涂料也优选包括选自交联剂、蜡、二氧化硅、金属氢氧化物及其混合物的防粘连剂。当防粘连剂包括金属氢氧化物时，涂料优选包括大约0.05到大约1.0wt％金属氢氧化物。当防粘连剂是交联剂时，涂料优选包括大约0.05到5wt％交联剂。优选的交联剂是蜜胺甲醛树脂。
当防粘连剂包括蜡时，涂料优选包括大约4到15wt％蜡。
优选地，底漆涂料包含大约60到95wt％共聚物分散体。该分散体通常包含35％总固体含量。当粘附增强剂包括脂族聚氨酯分散体时，涂料优选包含大约5到40％该分散体，该分散体包含33％总固体含量。当粘附增强剂包括氢化烃松香或松香酯分散体时，涂料优选包含大约10到40wt％基于55％总固体含量的氢化烃松香或松香酯分散体。当调色剂粘附增强剂包括无定形的丙烯酸类聚合物分散体时，涂料优选包含大约5到40wt％基于35％总固体含量的该无定形的丙烯酸类聚合物分散体。
优选通过将涂料涂覆到基材的至少一个主表面上，然后优选将该涂料干燥而将底漆涂料涂覆到聚合物基材上。优选地，聚合物基材选自聚丙烯、双轴取向的聚丙烯、流延聚丙烯、聚对苯二甲酸乙二醇酯、聚酰胺、双轴取向的聚酰胺和聚氯乙烯。
在一个实施方案中，涂覆底漆涂料的方法包括在涂覆底漆涂料之前用火焰处理或电晕放电处理对基材的至少一个主表面进行处理。
通常，将底漆涂料涂覆到聚合物基材上，使得当干燥时，它形成厚度为大约0.1到大约2微米，更优选大约0.3到大约0.5微米的涂层。然后可以通过将液体调色剂从数字印刷设备施涂到聚合物基材的涂覆表面上来印刷该涂覆的基材而不需要附加的预涂料。
因此，本发明的特征是提供底漆涂料和将该涂料涂覆到聚合物基材上的方法，当使用电子照相印刷设备用液体调色剂油墨印刷该涂覆的聚合物基材时，该底漆涂料会为该涂覆的聚合物基材提供增强的调色剂粘附性。这一特征以及本发明的其它特征和优点将通过以下详细说明变得显而易见。
本发明的底漆涂料提供许多优于现有涂料的优点，在于它为许多不同的聚合物基材提供增强的液体调色剂粘附性。另外，该涂料不需要使用任何附加的底漆或预涂料来达到适当的粘附，并且因为它包含水基组合物，所以避免了溶剂型涂料的问题。
底漆涂料基于乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体，这确保了油墨图像到基材上的良好转移。该共聚物显示对烯属聚合物的良好粘附，原因在于此类聚合物通常是用于液体调色剂组合物的粘结剂。该共聚物应该具有足够的热粘着度以确保在印刷期间当图像接触到基材时，在通常操作温度(120℃到140℃)下该图像会从印刷用橡皮布上迁移。优选地，该共聚物包含大约65到95wt％乙烯和大约5到35wt％丙烯酸或甲基丙烯酸。该共聚物可以具有大约2,000到50,000的数均分子量。优选如下将该共聚物制备成分散体：在压力反应器中在碱(base)如氨或碱(alkali)的存在下用水相加热固体聚合物，以致该碱与该聚合物上的酸基反应，并且一旦熔融，该聚合物形成胶状分散体。底漆涂料包含大约60到95wt％该分散体，后者包含35％总固体含量。用于本发明的适合的乙烯-丙烯酸分散体可以从Michelman以名称Prime 4990R.E.商购。
虽然乙烯-丙烯酸或甲基丙烯酸共聚物显示良好的油墨可转移性，但是通常它们不具有足够的对非极性聚合物基材如聚丙烯或聚对苯二甲酸乙二醇酯的粘附性。因此，底漆涂料还包括粘附增强剂，其与乙烯-丙烯酸或甲基丙烯酸共聚物分散体相容并且增加对底层基材的粘附性而不会不利地影响油墨图像到基材的转移。粘附增强剂优选呈分散体形式，该分散体包含聚氨酯、氢化烃松香或松香酯或无定形的丙烯酸类聚合物。当涂料包括聚氨酯分散体时，该涂料优选包括大约5到40wt％的含33％总固体含量的该分散体。适合的聚氨酯分散体可以从NeoResins以名称
Figure S05818232920061207D000042
R-600商购。其它适合的聚氨酯分散体包括得自Industrial Copolymer Ltd.的Incorez 217和得自ScottBader Company Ltd的TD7037或TD7038。
当调色剂粘附增强剂包括烃松香或松香酯分散体时，涂料包括大约10到40wt％的包含55％固体的该分散体。优选地，使用环球软化点为大约70℃到105℃的氢化烃松香或松香酯。松香或松香酯分散体优选如下形成：将松香或松香酯熔融，然后在水相中使用表面活性剂并搅拌来分散该聚合物。适合的烃树脂分散体可以从Eastman ChemicalResins Inc.以名称Tacolyn 1100商购。其它适合的烃树脂分散体包括同样可以从Eastman Chemical Resins Inc获得的Tacolyn 3166和Tacolyn 4187。
当调色剂粘附增强剂包括无定形的丙烯酸类聚合物分散体时，涂料可以包括大约5到40％的含35％固体的该分散体。该分散体优选如下制备：在升高的温度下，在氨或碱的存在下将无定形的丙烯酸类聚合物溶于水中。适合的无定形的丙烯酸类乳液是得自Neo Resins的Neocryl BT36。
本发明的底漆涂料优选进一步包含湿润剂，用来降低涂料的表面张力以浸湿基材并用来在干燥之前促进涂料的流动和均化。适合的湿润剂包括表面活性剂和醇如异丙醇。优选的表面活性剂包括非离子型基于acetylinic二醇的表面活性剂如得自Air Products的DynolTM604。其它适合的表面活性剂包括聚氧化烯改性的聚甲基硅氧烷，如得自GE Advanced Materials的
Figure S05818232920061207D000051
L-77。
可以包括在底漆涂料中的其它任选的添加剂是消光剂如无定形二氧化硅，其维持无光泽的印刷表面。此类添加剂可以大约2到4wt％的量存在。优选的无定形二氧化硅是可以从Degussa获得的Ace-Matt TS100。如果所使用的基材是有光泽的，可以使用更高量的二氧化硅(高达大约15wt％)来获得无光泽的印刷表面。
因为底漆涂料显示高的热粘着性，所以希望将一种或多种防粘连剂添加到该涂料中以降低在涂覆之后和在储存期间将基材复卷时的残余粘着性。防粘连剂不应该干扰热粘着性的产生和油墨图像到基材的转移。优选的防粘连剂包括交联剂、蜡、二氧化硅、金属氢氧化物及其混合物。优选的交联剂是蜜胺甲醛树脂，其可以大约0.05到5wt％的量存在。其它适合的交联剂包括氢氧化钠、氢氧化钾、氧化锌和聚氮丙啶(Aziridine)。
适合的蜡包括加洛巴蜡、氧化的聚乙烯蜡和褐煤蜡。优选使用的是可以从Michelman，Inc.以名称Lube 160获得的25％固体的加洛巴蜡乳液。该蜡优选以总分散体的大约4到15wt％的量存在。
当将金属氢氧化物作为防粘连剂添加到配制剂中时，它们作为金属离子引入以形成乙烯-丙烯酸或甲基丙酸烯共聚物的部分离子聚合物化。该金属离子可以选自元素周期表第IA、IIA或IIB族的金属离子。优选使用的是以其氢氧化物形式存在的钠或钾离子。该氢氧化物以大约0.05到1wt％的量存在。当使用此类金属氢氧化物时，底漆涂料优选通过形成两种乙烯-丙烯酸分散体来制备；例如基于MichemPrime 4990R.E.的氨分散体和基于相同乙烯-丙烯酸的钠分散体。
优选按40到100份该氨基分散体和0到60份该钠基分散体的比例将该两种分散体和剩余组分共混。
也可以将水(优选软化水)添加到底漆涂料中以降低该涂料的粘度并有助于该涂料的流动。该涂料可以包含0到30wt％软化水。
在将底漆涂料涂覆到聚合物基材上之前，该基材的表面优选经处理以确保该涂料将润湿该薄膜的表面。优选使用常规技术如火焰处理或高压电晕放电处理来处理该薄膜。
以任何适合的方式包括凹版涂布、辊涂、线材涂布、苯胺印刷、喷涂等将底漆涂料涂覆到聚合物基材上。优选这样来涂覆涂料组合物，使得在干燥之后该涂料形成光滑的、均匀分布的厚度大约为0.1到2微米，更优选为大约0.3到0.5微米的层，该层赋予液体调色剂油墨和基材所需的可印刷性和粘附性。在涂覆涂料之后，可以通过热空气、辐射热或可提供透明的、粘着的涂覆薄膜的任何其它合适的手段来干燥该涂料。
为了让本发明可以更容易地理解，提到以下实施例，它们旨在说明本发明，而不应视为限制本发明的范围。
实施例1
根据本发明实施方案通过混合下列组分制备了若干底漆涂料组合物。
配制剂1
组分                           占总组合物的wt％
乙烯-丙烯酸共聚物分散体1       53.7
烃松香酯分散体2                23.3
异丙醇                         15.4
软化水                         7.6
配制剂2
组分                            占总组合物的wt％
乙烯-丙烯酸共聚物分散体1        90
水基聚氨酯分散体3               10
配制剂3
组分                            占总组合物的wt％
乙烯-丙烯酸共聚物分散体1        80
水基聚氨酯分散体3               20
对比配制剂4
组分                          占总组合物的wt％
乙烯-丙烯酸共聚物分散体1      33.5
异丙醇                        20.0
软化水                        46.5
配制剂5
组分                          占总组合物的wt％
乙烯-丙烯酸共聚物分散体1     76.5
水基聚氨酯分散体3            19.1
软化水                       4.0
表面活性剂4                  0.4
配制剂6
组分                         占总组合物的wt％
乙烯-丙烯酸共聚物分散体1     63.75
水基聚氨酯分散体3            15.9
软化水                       20.05
表面活性剂5                  0.3
配制剂7
组分                        占总组合物的wt％
乙烯-丙烯酸共聚物分散体1    73.4
水基聚氨酯分散体3           18.4
软化水                            3.82
表面活性剂4                       0.38
蜡6                               4.0
配制剂8
组分                              占总组合物的wt％
乙烯-丙烯酸共聚物分散体1          46.7
钠稳定化的乙烯-丙烯酸分散体7      36.7
水基聚氨酯分散体3                 16.6
1得自Michelman的MP4990R.E
2得自Eastman Chemical Resins Inc.的Tacolyn 1100
3得自Neo Resins的Neo Rez R-600
4得自Air Products的Dynol 604
5得自Setre Chemical的Silwet 77
6得自Michelman，Inc.的加洛巴蜡乳液ML 160
7基于MP 4990R.E.的钠分散体(20％固体含量)
使用棒式涂布机并涂覆4微米的湿涂层将配制剂1-4涂覆到聚对苯二甲酸乙二醇酯(PET)薄膜上，该薄膜具有大于53达因/厘米的表面能。使用热空气在大约100℃下干燥这些涂层。然后在Hewlett-Packard Indigo单张纸印刷机上使用液体调色剂油墨印刷全部四个涂覆的基材，并测试底漆对基材的粘附性以及调色剂油墨对该底漆的粘附性。在15分钟之后和24小时之后通过施加根据ISO 2409的粘合带并且在30分钟之后除去该粘合带进行粘附性测试。如果发生任何薄膜(底漆涂层)或调色剂的除去，则该测试记录为失败；没有发生调色剂或涂层的除去则表示通过。
对比配制剂4是唯一失败的配制剂。在所有其它配制剂中，取得薄膜对底漆涂层的总粘附性和调色剂对涂层的总粘附性。结果证实，当与本发明实施方案的配制剂相比时，仅有乙烯-丙烯酸共聚物分散体，即使当连同湿润剂和高表面能薄膜使用时，也不会获得足够的调色剂粘附性。
实施例2
使用实施例1描述的涂覆方法将上述配制剂1、2和3涂覆到电晕放电处理过的双轴取向的聚丙烯薄膜(具有大于40达因/厘米的表面能)上。在Hewlett-Packard Indigo系列1000单张纸印刷机上印刷全部三个涂覆的基材，并在15分钟和24小时之后测试粘附性。全部三个印刷样品通过了如上所述的粘合带测试。在一个独立测试中，当在相同条件下涂覆时，对比配制剂4显示对OPP膜的粘合失败。
实施例3
使用苯胺印刷辊式涂布机以0.7gm/m2的涂料重量将配制剂1涂覆到不透明的聚丙烯合成纸(从YUPO Corporation获得)上。使用红外线加热器在线干燥该涂料然后复卷。然后切开该涂覆的卷并制成薄片。使用惠普公司HP Indigo系列1000单张纸印刷机印刷该薄片。印刷样品通过了如上所述的粘合带测试。
实施例4
在与实施例3相同的条件下将配制剂5涂覆到YUPO不透明聚丙烯合成纸上，并且使用Hewlett-Packard Indigo系列1000单张纸印刷机印刷薄片。印刷样品通过了如上所述的粘合带测试。
实施例5
使用棒式涂布机将配制剂6涂覆到OPP和PET薄膜的透明卷上，其中与涂料的涂覆联机对该透明卷进行了电晕放电处理。使用空气浮选干燥器在70℃的温度下干燥该涂层并在复卷之前使用骤冷辊冷却。对涂覆制品进行如上所述的带粘附性测试，测试通过。然后在卷筒式给纸的Hewlett-Packard Inddio卷筒纸印刷机上印刷该涂覆制品。立即和在24小时之后使用带粘附性测试测试粘附性。该印刷和涂覆的产品通过测试。
实施例6
将配制剂7涂覆到透明和白色的电晕放电处理过的BOPP薄膜、电晕放电处理过的不透明聚丙烯薄膜和光泽纸上。使用装有IR干燥器的Cooper Flexo Reflex Coater涂覆涂料。进入该涂布机的纸幅的温度是16℃并且在干燥以后，当复卷时该纸幅的温度是32℃。对于所有涉及的基材来说，计算的平均干涂层重量为0.215克/m2。在离开机器之后立即使用根据ISO 2409的粘合带并且在30分钟之后除去该粘合带来测试该底漆涂层对基材的粘附性。所有底漆涂层通过测试。
然后在WS4000Hewlett-Packard Indigo按压供纸(press fed)印刷机上印刷该涂覆的基材。为了对比，还印刷相同BOPP的未涂覆基准薄膜样品。
印刷试验测试了以下性能：转移、固定、剥落、印刷清洁器、记忆和输送。转移是指调色剂油墨转移到基材上的质量和涂覆的基材对调色剂的相容性，特别是亮光点、细线和大视野面积。5个不同印刷测试的重复图案运行大约200延米。注意转移的任何缺失。
固定是指油墨对基材的粘附。测试图像将着色的块状区域印于基材上，在印刷之后立即和在1小时的间隔之后测试油墨对基材的粘附性。在15分钟内达到100％粘附认为是良好的。
剥落是指油墨从基材剥离的趋势。这一测试显示基材-涂层-油墨界面的粘附性和挠性。
印刷清洗的数目是指除去任何留在橡皮布或光成像板上的残余调色剂油墨并得到完全清洁的图像所需要的薄片数目。这通过印刷许多A4 100％黄色图像来进行。理想地，应该使用较低的数目，这表明发生了100％油墨从橡皮布转移到基材。
记忆是指进行应力测试来看先前图像的记忆是否转移到下一个基材上。这是另一种来看涂覆的基材是否提供100％的油墨从橡皮布转移的测试方式。
输送是指在印刷期间发生的任何纸幅的送料问题。
测试的结果在下表1中示出。
表1
Figure S05818232920061207D000111
所有的涂覆的基材显示极好的在HP Indigo WS4000印刷机上的可印刷性，但除了未涂覆的基准样品之外，其发现是不可印刷的，即没有印刷品转移到样品上。
实施例7
通过直接凹板印刷在三个不同的薄膜上印刷配制剂7和8。薄膜是双轴取向的聚丙烯(BOPP)和聚对苯二甲酸乙二醇酯(PET)。在HPIndigo Press WS4000印刷机上采用ElectroInk Mark 4.0(HP Indigo)印刷该涂覆的基材。基材输送非常好。没有发现摩擦、粘着性或静电问题。在总体测试期间的油墨可转移性是优异的。直到橡皮布达到50,000以上的分离，油墨转移中都没有发现失败。对大多数测试来说，清洁页和清洁监测器表明该橡皮布不含油墨残余物或背景图象。在高到至少25,000分离的情况下，该橡皮布仍发现不含印刷记忆或重影。基材上底漆和调色剂油墨的粘附性是优异的。使用剥离测试程序采用3M 610带进行测试。
虽然为了说明本发明给出了某些代表性实施方案和细节，但是对本领域技术人员来说显而易见的是，在不脱离本发明范围的情况下可以对本文所公开的方法和装置作出各种改变。

Claims (21)

1.用于增强液体调色剂对聚合物基材粘附性的底漆涂料，所述涂料包含以下物质的混合物：
a)60到95wt％的乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体，所述共聚物分散体含35wt％总固体含量；
b)5到40wt％的选自脂族聚氨酯分散体的相容性粘附增强剂，所述分散体包含33wt％总固体含量；和
c)0.05到1.0wt％的金属氢氧化物防粘连剂。
2.权利要求1的底漆涂料，其还包括湿润剂。
3.权利要求2的底漆涂料，其中所述湿润剂选自醇和表面活性剂。
4.权利要求1的底漆涂料，其还包括消光剂。
5.权利要求4的底漆涂料，其中所述消光剂包括无定形二氧化硅。
6.权利要求1的底漆涂料，其包含0.5到5wt％交联剂。
7.权利要求1的底漆涂料，其包含4到15wt％蜡。
8.具有第一和第二主表面的涂覆的聚合物基材，所述基材选自聚丙烯、聚对苯二甲酸乙二醇酯、聚酰胺和聚氯乙烯，其中所述主表面中的至少一个表面上涂有用于增强液体调色剂对其粘附性的底漆涂料，所述涂料包含以下物质的混合物：60到95wt％的乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体，所述共聚物分散体含35wt％总固体含量；5到40wt％的选自脂族聚氨酯分散体的相容性粘附增强剂，所述分散体包含33wt％总固体含量；和0.05到1.0wt％的金属氢氧化物防粘连剂。
9.权利要求8的涂覆的基材，其中所述基材是双轴取向的聚丙烯。
10.权利要求8的涂覆的基材，其中所述基材是双轴取向的聚酰胺。
11.权利要求8-10中任一项的涂覆的基材，其中所述聚合物基材的所述至少一个主表面在向其上涂覆所述底漆涂料之前已经过火焰处理或电晕放电处理。
12.权利要求8-10中任一项的涂覆的基材，其中所述底漆涂料的厚度为0.3到2微米。
13.权利要求12的涂覆的基材，其中所述底漆涂料的厚度为0.5到1微米。
14.将底漆涂料涂覆到聚合物基材上以增强液体调色剂对该聚合物基材粘附性的方法，包括：
1)提供选自聚丙烯、聚对苯二甲酸乙二醇酯、聚酰胺和聚氯乙烯的聚合物基材；所述聚合物基材具有第一和第二主表面；和
2)将底漆涂料涂覆到所述基材的所述主表面中的至少一个表面上；
所述底漆涂料包含以下物质的混合物：60到95wt％的乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体，所述共聚物分散体含35wt％总固体含量；5到40wt％的选自脂族聚氨酯分散体的相容性粘附增强剂，所述分散体包含33wt％总固体含量；和0.05到1.0wt％的金属氢氧化物防粘连剂。
15.权利要求14的方法，其中所述基材是双轴取向的聚丙烯。
16.权利要求14的方法，其中所述基材是双轴取向的聚酰胺。
17.权利要求14-16中任一项的方法，其包括在涂覆所述底漆涂料之前对所述基材的所述至少一个主表面进行火焰处理或电晕放电处理。
18.权利要求14-16中任一项的方法，其包括在涂覆所述涂料到所述基材的所述至少一个主表面上之后干燥所述底漆涂料。
19.印刷聚合物基材的方法，包括：
提供选自聚丙烯、聚对苯二甲酸乙二醇酯、聚酰胺和聚氯乙烯的聚合物基材；所述聚合物基材具有第一和第二主表面，其中所述主表面中的至少一个表面上涂有底漆涂料，所述涂料包含以下物质的混合物：60到95wt％的乙烯和丙烯酸或甲基丙烯酸的共聚物的分散体，所述共聚物分散体含35wt％总固体含量；5到40wt％的选自脂族聚氨酯分散体的相容性粘附增强剂，所述分散体包含33wt％总固体含量；和0.05到1.0wt％的金属氢氧化物防粘连剂；和
将液体调色剂从数字印刷设备施涂到所述聚合物基材的涂覆表面上。
20.权利要求19的印刷聚合物基材的方法，其中所述基材是双轴取向的聚丙烯。
21.权利要求19的印刷聚合物基材的方法，其中所述基材是双轴取向的聚酰胺。
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