CN1126669C - 涂覆的微孔喷墨接受介质和控制墨点直径的方法 - Google Patents
涂覆的微孔喷墨接受介质和控制墨点直径的方法 Download PDFInfo
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Abstract
公开了一种喷墨接受介质,该介质是微孔的,在其一个表面上具有成象层,该成象层是含无定形沉淀的二氧化硅和热解法二氧化硅及粘合剂的涂层。使用该接受介质,可控制含颜料的喷墨油墨的墨点直径,这对于以小皮升体积液滴打印的油墨是有利的。还公开了制造和使用该介质的方法。
Description
发明的领域
本发明涉及涂覆的喷墨接受介质,其涂覆的方式能控制喷至所述介质上的油墨点的铺展,从而形成优良的图象。
发明的背景
在现代生活中图象无所不在。用于警示、教育、娱乐、广告等的图象和数据被施加在各种内部和外部的、垂直和水平的表面上。图象的非限定性例子,包括墙上或车辆侧面上的广告、推出新电影的海报和楼梯边上的警示标志。
近年来,随着价廉并有效的喷墨打印机、给墨体系等的快速发展,使用热和压力喷墨的油墨越来越普遍。
热喷墨硬件可购自许多跨国公司,包括但不限于美国Palo Alto,CA的惠普公司、美国San Diego,CA的Encad公司、美国Rochester,NY的施乐公司、美国Eden Prairie,MN的LaserMaster公司和日本东京的Mimaki Engineering有限公司。由于打印机的制造商为消费者在不断改进其产品,因此打印机的型号和种类快速发生变化。根据最终图象所需的大小,可将打印机制成桌面型的和大尺寸(wide format)的。流行的商业规模热喷墨打印机的非限定性例子,有Encad公司的NovaJet Pro打印机和惠普公司的650C、750C和2500CP打印机。流行的大尺寸热喷墨打印机的非限定性例子,包括惠普公司的DesignJet打印机,其中2500CP是较好的,因为它具有600×600点/英寸(dpi)分辨率,墨点大小约为40皮升左右。
3M推出的Graphic Maker Inkjet软件适用于将互联网、ClipArt或数码照相机的数字图象转换成供热喷墨打印机打印这种图象用的信号。
喷墨油墨也可从许多跨国公司购得,尤其是3M公司推出了8551、8552、8553和8554系列加颜料的喷墨油墨。使用4种基色:青、品红、黄和黑(通常简称为CMYK)能在数字图象中形成多达256种或更多种颜色。
喷墨打印机用的介质也经历了飞速的发展。由于在工业和消费用途中喷墨成象技术已变得非常流行,使用个人计算机在纸上或其它接受介质上打印彩色图象的能力已由染料基油墨扩展至颜料基油墨。介质必须适应这种变化。由于用热喷墨打印头分配以前,颜料颗粒包含在分散液中,因此颜料基油墨能提供更耐久的图象。
喷墨打印机已被广泛用于大尺寸电子打印用途,例如用于工程制图和建筑制图。由于喷墨打印机容易操作并且经济,因此这种成象方法具有优良的成长潜力,使打印工业有望制造大尺寸、能按要求成象、显示质量好的图案。
因此,用于打印图案的喷墨系统的部件可归纳成三大类:
1.计算机、软件、打印机;
2.油墨;
3.接受介质。
计算机、软件和打印机用于控制油墨滴的大小、数量和位置,并输送接受介质使之通过打印机。油墨中含有形成图象的着色剂和该着色剂的载体。接受介质提供接受并容纳油墨的场所。喷墨图象的质量与总的系统有关。但是在喷墨系统中,油墨和接受介质的组成及其相互作用是非常重要的。
图象质量是观看的公众和付款客户想要得到的并直接看到的。从形成图象的设备来看,打印商店对喷墨介质/油墨体系提出许多其它较不明显的要求。同样,根据图象的用途,其放置环境可对介质和油墨提出其它要求。
根据PCT国际专利公布WO97/17207(Warner等),现有的喷墨接受介质上直接涂覆一层二元接受层,它以3MTM ScotchcalTM 3657-10不透明成象介质和3MTM ScotchcalTM TM3637-20透明成象介质的牌号由3M公司推向市场。
如美国专利5,271,765所述,喷墨油墨一般是全部或部分水基的。这些油墨的典型接受介质是普通纸或最好是特殊的喷墨接受纸,该纸经处理或涂覆以改进其接受性能或由其形成的图象的质量,例如如美国专利5,213,873所述。
已公开了许多适合于涂覆在塑料上,使之能接受喷墨油墨的喷墨接受组合物。其在字幕片方面的用途是本领域已知的。这些字幕片由透明的塑料材料(如聚酯)组成,但这种材料单独不能接受水性油墨,因此需要涂覆接受层。这些接受层通常由水溶性聚合物的混合物组成,这些水溶性聚合物能吸收组成喷墨油墨的水性混合物。如美国专利4,379,804、4,903,041和4,904,519例举的那样,这些接受层通常是亲水性层,包含聚乙烯基吡咯烷酮或聚乙烯醇。还已知如美国专利4,649,064、5,141,797、5,023,129、5,208,092和5,212,008所述,在接受层中交联亲水性聚合物的方法。如美国专利5,084,338、5,023,129和5,002,825所述,其它涂料组合物含有吸水性颗粒,如无机氧化物。喷墨纸的接受涂层也发现有相似的性能,如美国专利4,935,307和5,302,437所述,这种涂层同样含有颗粒(如玉米淀粉)。
许多这些喷墨接受介质形成图象的缺点在于它们具有水敏性聚合物层。即使随后经层压,它们仍含有水溶性或水可溶胀层。这种水敏性层随时间的推移会受到水分的作用,导致图象受损并使层压物脱层。另外,这些亲水性涂层的一些常见的组成含有水溶性聚合物,不适应室外环境中受到热量和UV照射的作用,从而限制了其室外寿命。最后,这些材料打印后的干燥速率显得太慢,因为在干燥前,涂层仍是塑性的,或者甚至会部分溶解在油墨溶剂(主要是水)中,使得图象容易受损,并且干燥前会发粘。
近年来,使用微孔薄膜作为喷墨接受介质来克服部分或全部上述缺点已日益引起人们注意。如果该薄膜是油墨的吸收剂,打印后油墨会通过毛细作用吸入薄膜的孔隙中,感觉上干燥非常快,因为油墨离开了打印图象的表面。该薄膜无需含有水溶性或水可溶胀的聚合物,因此可以具有抗热性和抗紫外光性能,不会受到水的损害。
如果材料本身是疏水性的,则多孔薄膜不一定对水基油墨具有接受性。使之具有亲水性的方法例举在例如PCT公布WO92/07899中。
由于某些薄膜材料(如购自PPG Industries的TeslinTM,一种填充二氧化硅的聚烯烃微孔薄膜和美国专利4,861,644例举的薄膜类型)本身的性能,它们就会是水性油墨的接受剂。但这种材料可能产生的问题是,当使用染料基油墨时,图象密度会较低,该图象密度取决于干燥后孔隙中保留的着色剂的量。避免该问题的一种方法是如PCT WO92/07899所述,在打印后熔凝该薄膜。
如美国专利5,605,750所述,其它方法是用接受层涂覆微孔薄膜。
如上所述,油墨和介质之间的关系是图象质量的关键。目前打印机的精度达到600×600dpi,喷墨液滴的尺寸比以前更小。如前面所述,对于这种dpi精度的典型液滴尺寸约为40皮升,这是以前用于宽行喷墨打印机140皮升液滴尺寸的1/3。打印机厂家正在尽量使用更小的液滴尺寸,如10-20皮升。对于加颜料的喷墨油墨,喷墨液滴的尺寸决定着包含在每个液滴中并施加至介质上某预定区域颜料颗粒的量。
当喷墨液滴与接受介质接触时,同时发生两种现象,即喷墨液滴垂直地扩散至介质中并水平地在接受介质表面上扩散,结果使液滴铺展。
但是,当颜料基喷墨油墨的颜料颗粒大小合适,与具有合适孔径的薄膜一起使用时,会产生某种程度的颗粒过滤在薄膜表面的现象,结果形成良好的密度和颜色饱和度。但是,如果由于“条纹现象”(此时保持的油墨不足以产生合适的点染图象),以致墨点放大(dot-gain)程度较小,则图象仍非常差。如果墨点尺寸太小,则介质移动或打印头喷嘴失误造成的误差就会产生条纹现象。在较大液滴尺寸的打印机中不会遇到这种问题。因为较大的墨点尺寸可掩盖此前的打印失误。但是,如果墨点太大,则会失去边界清晰度,而边界清晰度高就能提高dpi图象精度。因此控制墨点直径的能力是喷墨接受介质的重要性能。
美国专利5,605,750例举了施涂在填充二氧化硅的微孔薄膜(如TeslinTM)上的假勃姆石涂层。该涂层包含孔径为10-80埃的假勃姆石氧化铝颗粒。该文献还公开了一层附加的羟基丙基甲基纤维素保护涂层。
发明的概述
本发明适合于使用宽行喷墨打印机和颜料基油墨产生的图象。本发明通过在喷墨接受介质上控制喷墨小液滴的墨点直径来解决高精度喷墨打印系统中的条纹问题。
本发明的一个方面是一种喷墨接受介质,它是一种微孔介质,在其一个主表面上具有一层成象层,所述成象层是无定形沉淀的二氧化硅和粘合剂的涂层。所述粘合剂最好是水基乙烯-丙烯酸分散液和其它有机液体。所述涂层最好还包含无定形沉淀的二氧化硅和热解法二氧化硅的混合物。
成象层通过施涂不同重量比的二氧化硅和粘合剂和不同的涂层重量而制得,使得干燥后的成象层能控制颜料基喷墨油墨的墨点直径。具体地说,可控制在单个喷墨液滴中颜料颗粒的墨滴直径,以便最大限度地减少喷墨接受介质上不合需求的油墨条纹现象。
与无成象层的基片相比,使用本发明可通过控制二氧化硅/粘合剂的重量比来增加不同颜色油墨的墨点直径。
本发明另一方面是在微孔介质上施涂成象层形成喷墨接受介质的方法,所述成象层是无定形沉淀的二氧化硅和热解法二氧化硅及粘合剂的混合物的涂层,以及将喷墨油墨液滴打印在喷墨接受介质上形成墨点的方法,墨点含有颜料颗粒,在成象层上墨点的尺寸有所放大(in size)。
本发明的特征在于将颜料颗粒保留在或接近接受介质的成象表面上,同时使油墨的载体液穿过微孔介质。
本发明另一个特点是成象层与油墨中的颜料颗粒相互作用,从而以目前可得到的最小液滴尺寸来扩大墨点直径的外貌。
本发明的优点在于它能使接受介质上的墨点水平铺展,同时使载体液垂直地穿过介质排除掉,使最小的液滴尺寸变成墨点时扩大。使用本发明介质,可以使用最小体积的液滴,使其中的颜料颗粒在图象中最大限度地被看见,而不会对图象的目视边界清晰度产生不利的影响。若不控制墨点的直径,颜料颗粒沉积在介质上时会发生“堆叠”。本发明控制墨点直径,可控制颜料颗粒在大面积介质的成象表面上的铺展,不会损失目视的边界清晰度。
本发明另一个优点在于,在使用目前能得到的最大dpi的打印机和油墨的情况下,能使图象的外观误差最小。
下面结合本发明的实例说明其它特征和优点。
本发明的实例
微孔材料
喷墨接受介质由具有成象主表面和相反主表面的微孔薄膜制得。该材料最好是亲水性的,能从成象主表面上除去油墨中的载体液。
微孔薄膜可具有不同的孔径、组成、厚度和孔容。适用于本发明的微孔薄膜应具有适当的孔容,能完全吸收施涂在喷墨记录介质亲水层上的喷墨油墨。应注意这些孔隙必须是油墨可进入的。换句话说,孔隙区相互之间以及其与成象表面涂层之间无通道相连的微孔薄膜(即闭孔薄膜)难以获得本发明的优点,其作用与根本无孔隙的薄膜相似。
在ASTM D792中孔容定义为(1-薄膜的体积密度/薄膜聚合物的实体密度)×100。如果聚合物的实体密度是未知的,则可用已知密度的液体浸泡该薄膜,比较浸泡前后的重量来测定。对于亲水性微孔聚合物薄膜,典型的孔容为10-99%,通常为20-90%。
孔容与薄膜厚度一起决定该薄膜的油墨体积容量。薄膜的厚度还会影响薄膜的挠性、耐久性和尺寸稳定性。对于一般的用途,薄膜12的厚度可约为0.01-0.6mm(0.5mil-约30mil)或更厚。厚度较好约为0.04-0.25mm(约2-10mil)。
典型喷墨打印机的液体体积约为40-150皮升/滴,尽管预料打印机的液滴大小甚至可小到10-20皮升(这种情况也适用于本发明)。因此,本发明适用于小于150皮升的液滴尺寸。典型的分辨率为每厘米118-283滴。高分辨率的打印机提供更小的墨点体积。实际结果表明,每种颜色的沉积体积为每平方厘米1.95-2.23微升。多色体系中的实心覆盖可高达300%(使用欠色分离(undercolor removal)),所以体积沉积为每平方厘米5.85-6.69微升。
亲水性微孔聚合物薄膜的孔径小于使用该喷墨记录介质的喷墨打印机的普通液滴尺寸。孔径可为0.01-10微米,宜为0.5-5微米,这些孔隙在膜片的至少一个面上。
薄膜的孔隙(指孔隙式样)无需穿透薄膜的整个厚度,仅需达到足够的深度以产生所需的孔容。因此,薄膜的性能可以是不对称的,其一面具有上述性能,而另一面是或多或少多孔的,甚至可以是无孔隙的。在这种情况下,具有孔隙的一面必须具有足够的孔容,能吸收穿过成象层的油墨液体。
亲水性微孔聚合物薄膜的非限定性例子,包括具有微孔结构的聚烯烃、聚酯、聚卤乙烯和丙烯酸薄膜。这些材料中较好的是如美国专利4,833,172所述购自PPG Industriesde的“Teslin”微孔薄膜,以及如美国专利4,867,881、4,613,441、5,238,618和5,443,727所述通常用作微过滤、打印或液体阻挡薄膜的亲水性微孔薄膜。Teslin微孔薄膜的总厚度约为0.18mm,实验测定的孔容为65.9%。因此该薄膜的油墨体积容量为每平方厘米11.7微升。因此,这种薄膜具有足够的孔容与厚度的组合,能完全吸收大多数打印机沉积的油墨(甚至300%的覆盖),而无需考虑吸湿层中吸附的量。
薄膜还可含有本领域普通技术人员已知的各种添加剂。这些添加剂的非限定性例子包括二氧化硅、滑石粉、碳酸钙、二氧化钛或者其它聚合物添加剂。它还可含有改进涂层特性、表面张力、表面光洁度和硬度的添加剂。
可使用市售的或经压延的薄膜。可使用常规的材料加工设备和压力来压延薄膜,使得压延后产生的压延介质比压延前具有更高的光泽度。使压延后的介质在Byk-Gardner Gloss Meter上进行的85°光泽度测量值约为15-35单位,最好约为20-35单位是可以接受的。最好在涂覆上成象层以后压延薄膜,尽管也可以在涂覆以前进行压延。
成象层
成象层包含粘合剂和无定形沉淀的二氧化硅,最好包含至少一种粘合剂和无定形沉淀的以及热解法的二氧化硅的混合物。
二氧化硅与粘合剂的重量百分比可约为3.5∶1-2∶1,最好约3.0∶1-2.25∶1。发现这种最好的比例可使打印在接受介质上的图象具有最大的墨点直径,而不会损害目视边界清晰度。
涂覆重量(微孔介质上的干重)可约为10-300mg/ft2(108-3300mg/m2),较好约30-200mg/ft2(330-220mg/m2)。发现这种较好的涂覆重量范围能使墨点直径最大而不会影响目视边界清晰度。
粘合剂可以是能涂覆在微孔材料上并能与其所含的二氧化硅颗粒一起粘合在该材料上的水基或有机溶剂基粘合剂体系中的任何一种。粘合剂最好是抗水的,但仍可以用其水基分散液进行涂覆。这种粘合剂的非限定性例子包括乙烯-丙烯酸共聚物及其盐,苯乙烯-丙烯酸共聚物及其盐和其它含(甲基)丙烯酸部分的聚合物。较好的是,粘合剂是水基乙烯-丙烯酸分散液,名为Michem Prim4983R树脂,购自Michelman Inc.,9080 Shell Road,Cincinnati,OH45236-1299。
粘合剂将二氧化硅留在成象层中。发现二氧化硅会与油墨中的颜料颗粒和与颜料颗粒关联的分散剂相互作用。适用于本发明的二氧化硅可以是仅用无定形沉淀的二氧化硅,也可以是与热解法二氧化硅混合的无定形沉淀的二氧化硅。
这种二氧化硅的初级粒径约为15nm-6微米。粒径会具有很大的范围,因为本发明可使用两种不同类型的二氧化硅。可以加入的热解法二氧化硅的粒径比无定形沉淀的二氧化硅的粒径小得多,当两者均使用时,在二氧化硅混合物中热解法二氧化硅占较少的比例。当两种二氧化硅存在于混合物中时,二氧化硅的重量比(无定形:热解法)一般大于约1∶1,最好大于约3∶1。
无定形沉淀的二氧化硅可以购自Fegussa Corporation of RidgefieldPark,NJ,USA,其商品为FK-310。
热解法二氧化硅可以Cab-o-sil二氧化硅的商品名购自Cabot Corp.OfTuscola,IL USA,也可以Aerosil MOX 170二氧化硅的商品名购自DegussaCorporation of Ridgefield Park,NJ,USA。
通过改变二氧化硅/粘合剂的比例可控制墨点直径。与其上面无成象层的对照基片相比,将成象层中二氧化硅与粘合剂的重量百分比由约2.0∶1增至3.5∶1,可使青色颜料的墨点直径增加约32%-83%,使品红油墨的墨点直径增加约55%-104%,使黄色油墨的墨点直径增加约29%-48%,使黑色油墨的墨点直径增加约35%至90%。增加值的不同取决于油墨配方和二氧化硅与粘合剂的重量比。但是本领域的普通技术人员会认识到,二氧化硅/粘合剂重量比的调节在获得本发明的优点方面是很有作用的。
任选的粘合剂层和剥离衬里
在微孔材料与成象主表面相背的主表面上,接受介质任选地但最好具有一层粘合剂层,并且可以而且最好用剥离衬里保护之。成象以后,可将接受介质粘合在水平的或垂直的内表面或外表面上,用于警示、教育、娱乐、广告等用途。
粘合剂和剥离衬里的选用取决于图象所需的用途。
压敏粘合剂可以是对喷墨接受介质和已具有永久精确图象的该介质预定要放置的物体都有粘合作用的任何常规的压敏粘合剂。压敏粘合剂的一般描述可参阅Satas编的
压敏粘合剂手册2nd Ed(Von Nostrand Reinhold 1989)。压敏粘合剂可从许多厂家购得。较好是购自美国3M公司并一般描述在美国专利5,141,790、4,605,592、5,045,386和5,229,207以及EPO专利公布EP 0 570515B1(Steelman等)中的丙烯酸酯压敏粘合剂。
剥离衬里也是众所周知的,可购自许多厂家。剥离衬里的非限定性例子包括涂覆硅氧烷的牛皮纸、涂覆硅氧烷的聚乙烯涂层纸、涂覆或未涂覆硅氧烷的聚合物材料,如聚乙烯或聚丙烯,以及涂覆有聚合物剥离剂的上面所述的基材聚合物剥离剂,如硅氧烷脲、氨基甲酸酯和长链丙烯酸烷酯,如美国专利3,957,724、4,567,073、4,212,988、3,997,702、4,614,667、5,202,190和5,290,615所述的剥离剂,以及购自Rexam Release of Oakbrook,IL,USA的Polyslik牌衬里和购自P.H.Glatfelter Company of Spring Grove,PA,USA的EXHERE牌衬里。
制造成象层的方法
可在刮刀(带凹口的棒)涂覆机上,以0.002英寸(0.051mm)湿间隙使用约0.5%-6%固体的分散液进行涂覆,或在类似设备上(如以3mil(0.76mm)间隙用0.3-4%的分散液等)进行涂覆,或者使用凹槽辊涂覆机涂覆在TeslinTM薄膜上或含TeslinTM的结构物上,这种结构物如Teslin/粘合剂/剥离衬里的层压物(它可用本领域已知的粘合剂和层压或涂覆方法制得)。在涂覆过程中为避免起泡,可向含1.0-1.4%固体的溶液中加入多达12.5%的溶剂,如甲基乙基酮。
在本方法的一个实例中,将粘合剂涂覆在剥离衬里上,将微孔薄膜层压上去,再涂覆以成象层然后进行压延来制得接受介质。
在本方法的另一个实例中,将微孔材料层压在转移衬里上的粘合剂上,随后在压延前或压延后以及在涂覆成象层前或涂覆成象层后,将其转移至最终剥离衬里上。
最好的制造次序是第一个实例的次序。
本发明的使用
本发明喷墨接受介质可用于需要精确、稳定和快速干燥的喷墨图象的任何场合。图象的实际用途包括标语和旗帜。
压延后,本发明喷墨接受介质具有尺寸稳定性,在10%-90%相对湿度下,在各方向下测得的吸湿膨胀造成的尺寸变化小于1.5%。因此,本发明介质优于涂覆纸,因为在加工或使用过程中纸张容易改变形状或尺寸。
本发明喷墨接受介质可接受各种喷墨油墨制剂,产生能快速干燥和精确的喷墨图案。可根据数个因素(如油墨滴的体积、油墨液体载体组成、油墨种类(颜料或颜料和染料的混合物)、和制造技术(机器速度、分辨率、辊结构等)),来改变喷墨记录介质各层的厚度和组成获得最佳结果。
通常,喷墨油墨制剂含有颜料,这颜料是在掺混有其它溶剂的水中的。水和其它溶剂将颜料载带至成象层中,随后继续进入薄膜,从而快速干燥成象层中的图象,形成精确的图象。
在上述二氧化硅/粘合剂重量比和干涂层重量范围内,发现本发明成象层能控制墨点的直径。令人惊奇的是,当二氧化硅/粘合剂的重量百分比约为2.75∶1,干涂层重量约为130mg/ft2(1430mg/m2)时,发现用液滴体积约40皮升以600dpi进行打印时墨点直径达到最大约150微米的峰值。若将上述任何一个参数显著变大或变小,都会降低墨点直径。本领域的普通技术人员可以使用可接受的重量比和干涂层重量的任何组合,来控制墨点直径,并使条纹现象和不合需求的图象缺陷减至最少。
例如,可将二氧化硅/粘合剂的比例增至约3∶1,并将干涂层的重量减至约32mg/ft2(352mg/m2),使得到的墨点直径比峰值小约75-92%,该范围取决于使用的油墨颜色。
例如,可将二氧化硅/粘合剂的比例减至约2∶1,保持干涂层重量不变,得到的墨点直径与峰值大致相同,但是目视边界清晰度下降。
干燥速度可以图象不发粘或轻轻擦拭不会抹去所需的时间来度量。通常,成象后在约2分钟内,较好在约30秒内感觉图象干燥。使用成象层提供墨点直径并且使用微孔介质使图象快速干燥,这些是本发明接受介质的优点,是本领域以前未曾有的。
与未涂覆的微孔材料相比,可使用Jenavert光学显微镜以625倍放大倍数,用带刻度的目镜测定墨点尺寸,并由此得到墨点直径。目镜刻度每个分度的微米图象尺寸事先进行了校准。挑选尽可能接近圆形的墨点,每种颜色的三个墨点沿两个垂直轴测定墨点直径。对每种颜色墨点的这6个直径取平均,得到该颜色墨点的最终直径值。
对于每种打印颜色,墨点直径可约为70-150微米,较好约80-120微米,以便将条纹现象减至最少。即使打印墨滴的体积小至40皮升时,使用本发明成象层也可达到将条纹现象减至最少的目的。
使用各种商业打印技术可形成精确的喷墨图象。这种技术的非限定性例子包括使用热喷墨打印机,如DeskJet牌、PaintJet牌、Deskwriter牌、DesignJet牌和购自Hewlett Packard Corporation of Palo Alto,California的其它打印机。还包括使用压力型喷墨打印机,如购自Seiko-Epson的这种打印机、喷射打印机和连续喷墨打印机。这些市售的打印技术将一定图象的油墨喷射在本发明介质中。在本发明中干燥比施涂在同样无孔介质上的图象层快得多。
本发明介质可用于各种市售的喷墨油墨。应理解这些油墨均各具有不同配方,即使相同油墨组中颜色不同,配方也不同。本发明控制墨点直径的效果对不同的油墨配方(即使对于不同的颜色)是不同的。因此,某些油墨比其它一些油墨更需要本发明方法。这种油墨的非限定性来源包括美国3M公司、EncadCorporation、惠普公司等。这些油墨最好设计成能用于上述和发明背景部分所述的喷墨打印机中,当然需要阅读打印机和油墨说明书确定合适的液滴体积和dpi,以进一步发挥本发明的实用性。例如,在“40皮升”打印机中发生条纹现象的问题可使用本发明很好得到解决。但是,在“大液滴体积”打印机中使用本发明还可对付其它问题。由于本发明的特征是能够控制墨点直径,因此可选取一定的介质以适应一定的油墨和一定的打印机。
下列一些实施例进一步说明本发明的实施方案。
实施例
R定义为干涂层中二氧化硅总重量与树脂的比例。
实施例1-制备成象层
22%固体的预混淤浆的储备溶液
向一个烧杯中加入58.90g Michem Prime 4983R(购自Michelman Inc.,9080 Shell Road,Cincinnati,OH45236-1299)。加入14.99g去离子水并搅拌该分散液。向经搅拌的水基分散液中加入46.61g乙醇。经短时间混合后,大力搅拌该分散液并依次加入热解法二氧化硅Aerosil MOX 170(9.53g)和无定形沉淀的二氧化硅FK-310(30.97g)(两种二氧化硅均购自DegussaCorporation,65 Challenger Road,Ridgefield Park,NJ)。
使用带有分散头的Silverson高速多用途实验室混合机,将混合物搅拌5分钟使之均匀。
用等重量的几份乙醇-水混合物(38g去离子水与12g乙醇)相继稀释该22%预混物淤浆,得到5.5%、2.75%、1.375%和0.6875%固体百分数的溶液。为避免会使结果变化(由于改变粘合剂与二氧化硅的比例)的二氧化硅沉淀,溶液必须立即用于涂覆。
实施例2-制备各种二氧化硅/粘会剂制剂
如实施例1所述制得表中含11%固体的制剂。按1重量份溶液用1重量份溶剂混合物(38g去离子水,12g乙醇)的比例稀释之,并且立即涂覆。
表1:具有各种R比例的制剂
R | Michem Prime4983R | 二氧化硅MOX170 | 二氧化硅FK310 | 乙醇 | 水 | 总计 |
2 | 36.8135 | 4.331 | 14.07573333 | 53.1881 | 142.591667 | 251 |
2.25 | 33.98169231 | 4.497576922 | 14.61710769 | 53.1881 | 144.715523 | 251 |
2.5 | 31.55442857 | 4.640357143 | 15.08114286 | 53.1881 | 146.535971 | 251 |
2.75 | 29.4508 | 4.7641 | 15.48330667 | 53.1881 | 148.113693 | 251 |
3 | 27.610125 | 4.872375 | 15.8352 | 53.1881 | 149.4942 | 251 |
3.25 | 25.986 | 4.967911765 | 16.14569412 | 53.1881 | 150.712294 | 251 |
3.5 | 24.54233333 | 5.052833333 | 16.42168889 | 53.1881 | 151.795044 | 251 |
从而制得具有不同R值的含5.5%固体的涂覆液。将其涂覆在7293标签材料(购自3M Industrial and Conberter Systems Division of 3M,3M Center,Maplewood,MN 55144-1000,一种含TeslinTM SP700、粘合剂和衬里的标签材料)上。但是,如果涂覆在不使用粘合剂或衬里的TeslineTM SP上,相信也可获得相同的结果。试样具有不同的R值,但是具有相似的涂层重量。
本发明不限于上述实例。权利要求书附于后面。
Claims (25)
1.一种喷墨接受介质,它包括:
在一个主表面上具有成象层的微孔聚合物膜介质,所述成象层是无定形沉淀的二氧化硅和粘合剂的涂层,其特征在于所述微孔聚合物膜介质具有与成象层相通的孔容并且所述孔的体积容量能够吸收施加在成象层上的喷墨油墨。
2.如权利要求1所述的介质,其特征在于所述粘合剂包括含乙烯-丙烯酸共聚物或其盐、苯乙烯-丙烯酸共聚物或其盐或者含(甲基)丙烯酸部分的聚合物的水基分散液。
3.如权利要求1所述的介质,其特征在于所述粘合剂包括水基乙烯-丙烯酸分散液。
4.如权利要求1所述的介质,其特征在于所述成象层中还包含热解法二氧化硅。
5.如权利要求1所述的介质,其特征在于所述无定形沉淀的二氧化硅和热解法二氧化硅的重量比大于1∶1。
6.如权利要求1所述的介质,其特征在于所述二氧化硅和粘合剂的重量比为3.5∶1-2∶1。
7.如权利要求1所述的介质,其特征在于所述成象层的干涂层重量为100-3300mg/m2。
8.如权利要求1-7中任何一项所述的介质,其特征在于当喷墨液滴的体积约为40皮升时,所述成象层上墨点的直径可增加29-104%。
9.如权利要求1-7中任何一项所述的介质,它还包括在成象层背面的主表面上的压敏粘合剂层。
10.如权利要求1-7中任何一项所述的介质,它还包括在成象层背面的主表面上的压敏粘合剂层,以及在该压敏粘合剂层上的剥离层。
11.如权利要求1-7中任何一项所述的介质,其特征在于所述介质是压延的,并且85°光泽度测量值大于15个单位。
12.如权利要求1-7中任何一项所述的介质,其特征在于所述介质是压延的,并具有尺寸稳定性,在相对湿度由10%变化至90%时,在各方向下测得的吸湿膨胀造成的尺寸变化小于1.5%。
13.如权利要求1-7中任何一项所述的介质,其特征在于成象层是防水的。
14.如权利要求1-7中任何一项所述的介质,其特征在于所述微孔聚合物膜介质的孔容为10-99%。
15.如权利要求1-7中任何一项所述的介质,其特征在于所述微孔聚合物膜介质的厚度为0.01-0.6mm。
16.如权利要求1-7中任何一项所述的介质,其特征在于所述微孔聚合物膜介质沿其厚度方向具有不对称的空隙度分布。
17.如权利要求1-7中任何一项所述的介质,其特征在于所述微孔聚合物膜介质的总厚度约为0.18mm,孔容约为65.9%,油墨体积容量约为每平方厘米11.7微升。
18.如权利要求1所述的喷墨接受介质的制备方法,它包括下列步骤:
(a)形成一种微孔聚合物膜介质,它具有喷墨油墨可进入的孔容,该孔容能吸收施涂在成象层上的喷墨油墨;
(b)在该微孔聚合物膜介质上涂覆一层成象层,所述成象层包括无定形沉淀的二氧化硅和粘合剂,从而使成象层与微孔聚合物膜介质的孔容区通过通道相连。
19.如权利要求18所述的方法,在涂覆步骤(a)之前或之后它还包括压延微孔聚合物膜介质的步骤。
20.一种在喷墨接受介质上控制墨点直径的方法,它包括下列步骤:
(a)在微孔聚合物膜介质上涂覆一层成象层,形成喷墨接受介质,所述成象层包含无定形沉淀的二氧化硅及粘合剂,并且所述微孔聚合物膜介质具有与成象层相通的孔容,孔的体积容量能够吸收施加在成象层上的喷墨油墨;
(b)将喷墨油墨液滴打印在喷墨接受介质上,在成象层上含有颜料颗粒的墨点的尺寸有所增大。
21.如权利要求20所述的方法,其特征在于所述粘合剂包括水基乙烯-丙烯酸分散液,并且所述二氧化硅和粘合剂的重量百分比为3.5∶1-2∶1。
22.如权利要求20所述的方法,其特征在于所述成象层还包括热解法二氧化硅。
23.如权利要求20-22中任何一项所述的方法,其特征在于成象层的干涂层重量为100-3300mg/m2,当打印的喷墨液滴的体积约为40皮升时,所述成象层墨点直径可增加29-104%。
24.如权利要求20-22中任何一项所述的方法,在打印步骤(b)之前,还包括对喷墨接受介质进行压延的步骤。
25.一种喷墨图象,它包括如权利要求1-7中任何一项所述的介质和在该介质上的喷墨油墨,所述油墨包括颜料颗粒,并且以每滴小于150皮升的体积分散,所述颜料颗粒以受控的量在介质上铺展,所述介质中的控制由二氧化硅/粘合剂的重量百分比和介质上成象层的干涂层重量所决定。
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- 1997-12-11 DE DE1997631490 patent/DE69731490T2/de not_active Expired - Fee Related
- 1997-12-11 BR BR9714783A patent/BR9714783A/pt not_active IP Right Cessation
- 1997-12-11 JP JP2000507116A patent/JP3939922B2/ja not_active Expired - Fee Related
- 1997-12-11 CN CN97182341A patent/CN1126669C/zh not_active Expired - Fee Related
- 1997-12-11 ES ES97954074T patent/ES2230629T3/es not_active Expired - Lifetime
- 1997-12-11 WO PCT/US1997/022653 patent/WO1999007558A1/en active IP Right Grant
- 1997-12-11 KR KR1020007001371A patent/KR100550370B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
JP3939922B2 (ja) | 2007-07-04 |
AU5794698A (en) | 1999-03-01 |
KR100550370B1 (ko) | 2006-02-09 |
BR9714783A (pt) | 2000-07-25 |
KR20010022771A (ko) | 2001-03-26 |
DE69731490D1 (de) | 2004-12-09 |
US6114022A (en) | 2000-09-05 |
EP1003644A1 (en) | 2000-05-31 |
DE69731490T2 (de) | 2005-10-20 |
JP2001513463A (ja) | 2001-09-04 |
WO1999007558A1 (en) | 1999-02-18 |
EP1003644B1 (en) | 2004-11-03 |
ES2230629T3 (es) | 2005-05-01 |
CN1262648A (zh) | 2000-08-09 |
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