CN100480305C - 聚酯薄膜 - Google Patents
聚酯薄膜 Download PDFInfo
- Publication number
- CN100480305C CN100480305C CNB200480026336XA CN200480026336A CN100480305C CN 100480305 C CN100480305 C CN 100480305C CN B200480026336X A CNB200480026336X A CN B200480026336XA CN 200480026336 A CN200480026336 A CN 200480026336A CN 100480305 C CN100480305 C CN 100480305C
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- film
- polyester film
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- fine particles
- 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.)
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- 229920006267 polyester film Polymers 0.000 title claims abstract description 38
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 25
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical group OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 7
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 6
- 229920001577 copolymer Polymers 0.000 claims description 6
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- KKEYFWRCBNTPAC-UHFFFAOYSA-N terephthalic acid group Chemical group C(C1=CC=C(C(=O)O)C=C1)(=O)O KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims description 6
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 5
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- ORLQHILJRHBSAY-UHFFFAOYSA-N [1-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1(CO)CCCCC1 ORLQHILJRHBSAY-UHFFFAOYSA-N 0.000 claims description 4
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- 235000012204 lemonade/lime carbonate Nutrition 0.000 claims description 4
- KYTZHLUVELPASH-UHFFFAOYSA-N naphthalene-1,2-dicarboxylic acid Chemical class C1=CC=CC2=C(C(O)=O)C(C(=O)O)=CC=C21 KYTZHLUVELPASH-UHFFFAOYSA-N 0.000 claims description 3
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- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
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- YIMQCDZDWXUDCA-UHFFFAOYSA-N [4-(hydroxymethyl)cyclohexyl]methanol Chemical compound OCC1CCC(CO)CC1 YIMQCDZDWXUDCA-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
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- 238000005809 transesterification reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
提供一种白色的聚酯薄膜,其维持实用上充分的可见光区域的反射性能,即使添加高浓度的无机微粒子也稳定能够制膜,对由光源发出的热引起的尺寸变化也稳定。一种共聚聚酯及无机微粒子形成的组合物所构成的聚酯薄膜,上述组合物中的无机微粒子的比例为30~50重量%,上述薄膜的85℃的热收缩率在纵向和横向都为0.7%以下,且150℃的热收缩率在纵向和横向都为5.0%以下,并且波长400~700nm下的平均反射率为90%以上。
Description
技术领域
本发明涉及一种聚酯薄膜。更详细地说是涉及白色聚酯薄膜,特别适于作反射板用的白色聚酯薄膜。
背景技术
白色聚酯薄膜作为喷墨、热敏转印、胶版印刷等印刷记录接收片材的基材被广泛应用。一般制备这种白色聚酯薄膜是通过在聚酯中含有无机微粒子或含有非相溶树脂而进行的。
近年来,由于印刷精度提高,印刷物的鲜明性得到了提高,需要提供更高质感的白色聚酯薄膜。为了响应这种需求,特开平4-153232号公报及特开平6-322153号公报提出了添加多种类型的无机微粒子或一并添加无机微粒子和非相溶树脂的方案。然而对于这些技术,也需要提高它的鲜明性及高质感。特别是在便利店等的商店店名标识和用于商品广告的内照式电装饰招牌方面,为了提高宣传效果而使用多根萤光灯光源,使招牌表面的明亮度达到1000勒克斯以上,或者使用色彩丰富的氖管,想方设法使招牌表现的设计构思更加显眼,提高宣传效果,该内照式电装饰招牌使用用于提高照明度的反射板。还有,在液晶显示器方面,当照亮显示面时,一般采用在显示器的背面安放光源的背光源式,但近年像特开昭63-62104号公报公示的那样的侧光源方式,由于为薄型且可均匀照明的优点而被广泛地应用。这种侧光源方式从具有某种厚度的丙烯酸板等的边缘进行冷阴极管等的照明,由于网点印刷,照明光被均匀分散,能够得到具有均一亮度的画面。如果用这种方式,则由于不是在画面的背面而是在边缘部位设置照明,所以可以比背光源方式更薄。
为了防止照明光跑向画面背面,必须在画面背面放置反射板,要求这种反射板薄并具有对光的高反射性。正如大家所知,作为合乎这种目的的液晶显示反射板用的白色聚酯薄膜,从加工容易度并且价廉的方面考虑,含有氧化钛。然而,如特公平8-16175号公报记载,只添加非相溶树脂、氧化钛等,在提高反射率方面有限,可以说画面的亮度不充分。
添加高浓度的氧化钛等无机粒子可以期待反射率的提高。然而,例如添加50重量%后的情况下,因为粒子浓度非常高,所以容易发生破裂,使得制膜非常困难,根据情况还会有不能制膜的状况。另外,为了降低粒子浓度非常高的情况下的破裂频率,现在的方法将聚酯树脂进行共聚,但这种情况下热收缩率非常高,只能得到热尺寸稳定性极差的薄膜。
发明内容
本发明的目的在于解决有关问题,提供白色聚酯薄膜,其维持实用上充分的可见光区域的反射性能,并且,即使添加高浓度的无机微粒子也稳定能够制膜,对于来自光源的热所引起的尺寸变化也稳定。
本发明的另外的目的在于提供一种具有如上所述的特性,并且最适合用作太阳能电池的后板、液晶显示器及内照式电装饰招牌的反射板用基材的聚酯薄膜。
本发明的更进一步的其它目的和优点可以从下面的说明了解。
根据本发明,本发明的上述目的及优点通过聚酯薄膜来实现,其特征在于,第一,其由共聚聚酯及相对该组合物为30~50重量%的无机微粒子形成的组合物构成,其中共聚聚酯的主要的二羧酸成分是对苯二甲酸,主要的二醇成分是乙二醇,而且共聚成分是选自间苯二酸、萘二羧酸及环己烷二甲醇中的至少一种,
其在85°时的热收缩率不论纵向还是横向都在0.7%以下,而且150°时的热收缩率不论纵向还是横向都在5.0%以下,并且在波长400~700nm下的平均反射率在90%以上。
用上述组合物,可以对以前拉伸制膜非常困难的含高浓度无机微粒子的薄膜稳定地制膜,并能得到具有上述特性的白色聚酯薄膜。
具体实施方式
本发明的聚酯薄膜可是由单层组成的单层薄膜,也可以是由多层组成的层压薄膜。
层压薄膜至少有一层由上述共聚体和无机微粒子组成的上述组合物形成,例如,可以是由两层构成的层压薄膜,其中一层由上述组合物形成,另一层通过由上述共聚聚酯和无机微粒子构成的、且该无机微粒子占0~30重量%的组合物构成。
共聚聚酯
上述共聚聚酯,其主要的二羧酸成分是对苯二甲酸,主要的二醇成分是乙二醇,而且共聚成分是选自间苯二酸、萘二酸及环己烷二甲醇中的至少一种。
共聚成分的比例相对于所有的二羧酸成分或所有的二醇成分,优选为1~30摩尔%,更优选为3~25摩尔%,进一步优选为5~20摩尔%,特别优选7~15摩尔%。不足1摩尔%,含无机微粒子的层的拉伸应力变高,不能制膜;超过30摩尔%,热尺寸稳定性欠缺,导致制膜困难。
如上所述,共聚成分是间苯二甲酸、萘二羧酸例如2,6-萘二羧酸、或环己烷二甲醇例如1,4-环己烷二甲醇。通过使用这样的共聚聚酯,即使是含高浓度的无机微粒子的组合物也稳定能够制膜,因此优选使用。共聚聚酯的融点优选250℃以下,更优选245℃以下,最优选240℃以下。
无机微粒子
无机微粒子相当于组合物的含量为30~50重量%。无机微粒子不足30重量%,则难以得到充分的光线反射率和白度。超过50重量%,制膜时易发生断裂。
无机微粒子的平均粒径优选0.1~3.0μm,更优选0.2~2.5μm,特别优选0.3~2.0μm。不足0.1μm,则分散性极端恶化,引起粒子凝聚,因此容易导致生产工序上的困难,在薄膜上形成粗大突起,有可能产生光泽不好的薄膜,不优选。超过3.0μm,则薄膜表面变糙,光泽下降,这也不优选。作为无机微粒子,优选例如:硫酸钡、氧化钛、碳酸钙或二氧化硅。这些可以使用一种或两种以上一起使用。对于氧化钛可以列举出金红石型氧化钛和锐钛矿型氧化钛。使用金红石型氧化钛时,由光线引起的聚酯薄膜黄变减少,可以抑制色差的变化,故优选。金红石型氧化钛使用硬脂酸等脂肪酸或其衍生物等以使分散性提高时,可以提高薄膜的光泽度,故优选。而且金红石型氧化钛由于在其添加到聚酯前,用精制工艺调整粒径,去除粗大粒子,故优选。对于这种精制工艺的工业化方法,可以使用的粉碎方法如:喷射式粉碎机、球磨机,还可以使用分级方法如:干式或湿式离心分离机。可以组合两种以上的方法,也可以分阶段精制。
使共聚聚酯中含有无机微粒子的方法可以举出下面的例子:
通过在共聚聚酯合成时的酯交换反应或酯化反应结束前添加、或在缩聚反应开始前添加的方法,或者在共聚聚酯中添加并熔融混合的方法,在任一种方法中都制备出添加了大量惰性粒子的主颗粒,将它与不含添加剂的共聚聚酯混合,使之含有一定量添加物的方法;或者是直接使用上述主颗粒的方法。
再者,在上述共聚聚酯合成时添加的无机微粒子是氧化钛的情况时,优选做成将其分散在乙二醇的浆料,添加在反应系中。
在共聚聚酯中,优选减少无机微粒子的粗大凝聚粒子的个数。为了这个目的,制膜时使用的过滤器,优选使用由线径在15μm以下的不锈钢丝线构成的,网眼平均大小优选在10~100μm、更优选为20~50μm的无纺布型过滤器,将熔融的共聚聚合物组合物过滤。
如上所述,无机微粒子也可以多种并用,例如:可以在金红石型氧化钛中并用锐钛矿型氧化钛。另外,在氧化钛中也可以并用硫酸钡、碳酸钙、二氧化硅。
这种共聚聚酯组合物也可以含有荧光增白剂或紫外线吸收剂。在含有的情况下,荧光增白剂的浓度相对于组合物,优选为0.005~0.2重量%,更优选0.01~0.1重量%。作为荧光增白剂可以使用例如:OB-1(イ—ストマン公司生产)、Uvitex-MD(チバガイギ—公司生产)、JP-Conc(日本化学工业所生产)。
荧光增白剂的含量不足0.005重量%时,做成反射板后的照度提高不明显,减弱了添加的效果;超过2%时,荧光增白剂特有的颜色就表现出来,因此不优选。
紫外线吸收剂没有特别指定其种类,优选以未反应的形态使用环状亚氨酸酯和选自环状亚氨酸酯的至少一种化合物。作为此环状亚氨酸酯,使用如在特开昭59-12952号公报上记载的,作为其自身紫外线吸收剂公知的化合物。
紫外线吸收剂的添加量相对共聚聚酯,优选0.1~5重量%,更优选0.2~3重量%。其量小于0.1重量%,则防紫外线恶化的效果小,超过5重量%,则聚酯的制膜特性降低,不优选。
另外,构成本发明聚酯薄膜的上述组合物,优选基本上不含有基本上与共聚聚酯不相溶性的树脂成分。所谓基本上不含有是指相对于组合物为0~1重量%,优选0~0.5重量%。
热收缩率
本发明的聚酯薄膜在85℃的热收缩率在纵横向上都在0.7%以下,优选0.6%以下,更优选0.5%以下,并且,150℃的热收缩率在纵、横向上都在5.0%以下,优选在4.5%以下,更优选在4.0%以下。并且,热收缩率的平衡优选为,(纵向85℃的热收缩率)/(横向85℃的热收缩率)之比,用绝对值表示在1.0~3.0的范围内。超过这个范围,即使热收缩率显示上述值,因易产生褶皱故不优选。
厚度
本发明的聚酯薄膜厚度优选25μm~250μm,更优选30μm~220μm,特别优选40μm~200μm。小于25μm,光线反射率低,超过250μm,难以预料反射率的提高,故不优选。
光学性质
本发明的聚酯薄膜光线反射率,作为波长400~700nm下的平均反射率在90%以上,优选在92%以上,更优选在94%以上。用上述构成可以达到这种反射率,但当不具备这种反射率时,作为反射板使用时就不能得到充分的反射效率。
而且,本发明的聚酯薄膜优选光学浓度在1.2以上,并且在400~700nm波长区域的绝对正反射率的平均值在2.0以上。
层构成
正如前面所述,本发明的聚酯薄膜可以由单层薄膜构成也可以由多层薄膜构成。在由多层构成时,例如:可以由A层和B层形成的两层构成,也可以由A层、B层、A层形成的三层或A层、B层、C层形成的三层构成。另外也可以由四层以上构成。考虑制作上的容易度和效果,特别优选形态为单层、二层、A层/B层/A层形成的三层。还有为了在薄膜的单面或双面赋予其它功能,可以将其它层进一步层压,形成层压薄膜。这里所谓的其它层是指,例如:透明的聚酯薄膜、金属薄膜、硬涂层、墨水接受层等。
制备方法
下面举一例说明由多层构成的层压薄膜的制备方法。单层薄膜的情况也可以依据这种方法进行制备。
为了制备层压薄膜,使用夹钳式送料机构的同时利用多层挤压法制备层压未拉伸薄膜。即,将形成A层的聚合物的熔融物和形成B层的聚合物的熔融物用夹钳式送料机构按照A层/B层/A层进行层压,在压模上展开实施挤压。这时,用夹钳式送料机构层压的聚合物维持被层压的形态。从压模压出的片材在铸件转鼓上冷却固化,形成未拉伸状态的层压薄膜。
将这种未拉伸状态的可拉伸的层压薄膜,用轧辊加热或红外线加热等进行加热、在纵向上拉伸,得到纵拉伸薄膜。这种拉伸优选利用两个以上的轧辊之间的圆周速度差来进行。拉伸温度要比聚酯的玻璃化转变温度(Tg)高,优选在比Tg高20~40℃的温度下进行。拉伸倍数依据薄膜要求的特性而改变,其优选2.5~4.0倍,更优选2.8~3.9倍。不足2.5倍时,薄膜的厚度斑点变大,得不到良好的薄膜;超过4.0倍时,制膜过程中易发生断裂,不优选。
接下来,对纵拉伸薄膜依次实施横向拉伸、热定型、热松弛等处理,得到双轴定向薄膜。这些处理是一边移动薄膜一边进行的,此为优点。横向拉伸的处理优选从比聚酯的玻璃化转变温度(Tg)高10℃以上的温度开始进行,并且一边升温至比Tg高(10~70)℃的温度一边进行。横向拉伸过程中的升温可以是连续的也可以间断的(逐次的),通常逐次升温。例如:沿着薄膜的移动方向将拉幅机的横向拉伸区域分为多个,对每个区域流动规定温度的加热介质,由此进行升温。横向拉伸的倍数依据薄膜要求的特性而不同,优选2.5~4.5倍,更优选2.8~3.9倍。不足2.5倍,则薄膜的厚度斑点变大,得不到良好的薄膜;超过4.0倍,则制膜过程中易发生断裂,不优选。
横向拉伸后的薄膜可以在把住两端的情况下,直接在低于聚酯融点(Tm)20~80℃(Tm-20~80℃)的温度下,以固定幅度或减少10%以下的幅度下进行热处理,使热收缩率降低。高于这个温度,则薄膜的平面性恶化,厚度斑点增大。还有,热处理温度低于(Tm-80)℃,则热收缩率有时变大。再者,热定型后,在薄膜温度返回到常温的过程中,为了调整(Tm-20~80)℃以下区域的热收缩量,优选将把住的薄膜两端切掉,调整薄膜的纵向牵引速度,使其在纵向上松弛。作为松弛的方法,调整拉幅机出口侧的轧辊组的速度。作为松弛的比例,相对于拉幅机的薄膜线速度降低轧辊组的速度,优选降低速度0.1~1.2%,更优选0.2~1.0%,最优选0.3~0.8%,实施松弛。用这种松弛方法可以调整纵向的热收缩率。在直至切掉两端的过程中减小薄膜横向方向的宽度,可以得到所期望的热收缩率。
根据本发明,可以提供具有下面特性的白色聚酯薄膜:维持实用上充足的可见光区域的反射性能,即使添加高浓度无机微粒子也稳定能够制膜,相对于由来自光源的热引起的尺寸变化稳定。本发明的聚酯薄膜最适合作为光线的反射板如太阳能电池的后板,液晶显示器和内照式电装饰招牌之类的平板显示器的反射板或印刷记录接收片材的反射板。
实施例
下面用实施例详述本发明。另外,用以下的方法测定各特性值。
(1)薄膜厚度
用电测微计(アンリツ制K-402B)对薄膜样品测量10个点的厚度,将平均值做为薄膜厚度。
(2)各层的厚度
将薄膜样品切成三角形,在包埋盒固定后,用环氧树脂包埋。并且将被包埋的样品用超薄切片机(ULTRACUT-S)沿与纵向平行的剖面切成50nm厚的薄膜切片后,使用穿透型电子显微镜,用100KV加速电压观察摄像,从照片测定各层厚度,求得平均厚度。
(3)全光线相对反射率
在分光光度计(岛津制作所生产UV-3101PC)上安装积分球,在400~700nm范围测定以BaSO4白板为100%时的全光线相对反射率。从得到的测定值以2nm为间隔读取反射率。将所得值的平均值作为全光线相对反射率的平均值。将平均值用下面的基准评价。
○:全测定区域内反射率90%以上。
△:在测定区域内平均反射率90%以上,存在一部分反射率不足90%的区域。
X:在全测定区域内平均反射率不足90%。
(4)绝对正反射率
在分光光度计(岛津制作所UV-3101PC)上安装绝对反射率测定装置(岛津制作所生产ASR3105),以5°入射角,在400~700nm进行测定。从得到的测定值以2nm为间隔读取反射率。将所得值的平均值作为绝对正反射率的平均值。
(5)光学浓度
用光学浓度计(X-Rite公司生产商品名“TR-310”)测定薄膜样品的3原色时的V(Visual)光学浓度。
(6)拉伸性
纵向拉伸3.4倍、横向拉伸3.6~3.7倍,进行制膜,这时以下述基准对能否稳定制膜进行评价。
○:1小时以上能够稳定制膜
X:1小时以内发生断裂,不能稳定制膜
(7)热收缩率
将薄膜样品以无张力状态放在温度分别设定为85℃、150℃的恒温箱中保持30分钟,测定加热处理前后的标点间的距离,用下面算式算出热收缩率(85℃热收缩率、150℃热收缩率)。
热收缩率%=((L0-L)/L0)×100
L0:热处理前标点间的距离
L:热处理后标点间的距离
(8)玻璃化转变温度(Tg)、融点(Tm)
用示差扫描热量测定装置(TA Instruments 2100 DSC),以20m/分的升温速度进行测定。
实施例1~4
在表1所示的共聚聚酯中添加表1所示的无机微粒子,分别提供给加热到280℃的2台挤压机,使用将A层和B层成为A/B/A三层的夹钳式送料机构装置,将A层聚合物、B层聚合物混合,保持此层压状态通过压模成形为片状。然后将该薄片用表面温度25℃的冷却转鼓冷却固化,将得到的未拉伸薄膜导至加热到85~98℃的轧辊组,在长度方向(纵向)拉伸3.4倍,用25℃的轧辊组冷却。接着,一边将纵拉伸的薄膜的两端用夹子夹住,一边导入拉幅机在加热到120℃的氛围气中在垂直于纵向的方向(横向)上拉伸3.7倍。其后在表2记录的温度下、在拉幅机内进行热定型,在表2记录的温度下进行纵向松弛、横向变窄(宽度变窄れ),冷却至室温得双轴拉伸薄膜。将这种薄膜作为反射板进行使用时的物性数据如表2记录。
实施例5、6
将实施例1~4中的薄膜的层构成变为单层,将条件设定为表1、2记录的条件,除此之外其它和实施例1相同,得到薄膜。由于将层构成变为了单层,使用了1台挤压机。
比较例1
除了采用表1、2记录的条件外,其它和实施例1相同进行制膜。由于没有实施纵向、横向的松弛,所以热收缩率差。
比较例2
除了采用表1、2记录的条件外,其它和实施实例1相同进行制膜。无机微粒子的含有量少,反射率差。
比较例3
除了采用表1、2记录的条件外,其它和实施实例1相同进行制膜。薄膜厚度不够,反射率差。
比较例4
除了采用表1、2记录的条件外,其它和实施实例1相同进行制膜。使用没经共聚的聚合物,拉伸性极低,制膜时常发生断裂,因此不能制作薄膜。
比较例5
除了采用表1、2记录的条件外,其它和实施实例1相同进行制膜。由于共聚成份的比例低,致使拉伸性降低,因此制膜时常发生断裂。因此不能测定物性。
比较例6
A层中使用在聚对苯二甲酸乙二醇酯中配合有14重量%的碳酸钙的组合物,B层中使用在聚对苯二甲酸乙二醇酯中配合有10重量%为非相溶树脂的聚甲基戊烯树脂、1重量%的聚乙二醇的组合物,除此之外,其它和实施例1相同进行制膜。结果示于表1和表2中。结果是反射率差。
本发明的聚酯薄膜可优选用于代替纸张即卡片、标签、封印、送货发票、影像打印机用的显像纸、喷墨、条形码打印机用显像纸、广告画、地图、无尘纸、指示板、白板、热敏转印、胶版印刷、电话卡、IC卡等各种印刷记录的用途中。本发明的聚酯薄膜作为反射率高图案设计性好的接收片材的基材,还优选用于商品和店铺的宣传或车站向导指示牌等中使用的内照式电装饰招牌。用灯照亮液晶画面的时候,可以构成能得到更明亮画面的反射板用基材,因为由光源的热引起的尺寸变化小,所以可特别优选用于液晶显示器的反射板用基材及太阳能电池的后板。
Claims (9)
1.一种聚酯薄膜,其特征在于,其由通过共聚聚酯和无机微粒子形成的组合物构成,其中上述共聚聚酯的主要的二羧酸成分为对苯二甲酸,主要的二醇成分为乙二醇,并且共聚成分是选自间苯二酸、萘二羧酸及环己烷二甲醇中的至少一种,且相对于所有的二羧酸成分或所有的二醇成分,该共聚成分的比例为5~20摩尔%;上述无机微粒子相对于此组合物为30~50重量%,
其在85℃时的热收缩率不论纵向还是横向都在0.7%以下,而且150℃时的热收缩率不论纵向还是横向都在5.0%以下,
其光学浓度为1.2以上,并且在波长400~700nm下的平均反射率在90%以上,
所述无机微粒子是选自氧化钛、硫酸钡、碳酸钙以及二氧化硅中的一种或两种以上,且平均粒径是0.1~3.0μm的无机粒子。
2.如权利要求1记载的聚酯薄膜,其中组合物含有最多1重量%的与共聚聚酯非相溶性的树脂。
3.如权利要求1记载的聚酯薄膜,其是由2层以上构成,并且其中的至少一层是由权利要求1记载的组合物构成的层压薄膜。
4.如权利要求3记载的聚酯薄膜,其为层压薄膜,该层压薄膜至少具有由权利要求1记载的组合物构成的1层,以及由权利要求1记载的共聚聚酯及相对于此组合物为0~30重量%的无机微粒子形成的组合物所构成的1层。
5.如权利要求3记载的聚酯薄膜,其光学浓度在1.2以上,并且在400~700nm波长区域的绝对正反射率的平均值在2.0以上。
6.如权利要求1记载的聚酯薄膜,其薄膜厚度是25~250μm。
7.如权利要求1记载的聚酯薄膜,其用于反射板。
8.如权利要求1记载的聚酯薄膜,其用于平板显示器的反射板中。
9.如权利要求1记载的聚酯薄膜,其用于印刷记录接收片材中。
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JP2004176042A (ja) | 2002-10-04 | 2004-06-24 | Toray Ind Inc | 容器成形用白色ポリエステルフィルムおよび容器 |
KR100553655B1 (ko) * | 2003-03-12 | 2006-02-24 | 도레이새한 주식회사 | 미세기공 함유 폴리에스테르 필름 |
-
2004
- 2004-05-27 EP EP20040745531 patent/EP1666521B1/en not_active Expired - Fee Related
- 2004-05-27 JP JP2005513810A patent/JP4275138B2/ja active Active
- 2004-05-27 WO PCT/JP2004/007637 patent/WO2005026241A1/ja active Application Filing
- 2004-05-27 US US10/571,094 patent/US7261934B2/en not_active Expired - Fee Related
- 2004-05-27 CN CNB200480026336XA patent/CN100480305C/zh active Active
- 2004-05-31 TW TW093115548A patent/TW200510471A/zh unknown
-
2006
- 2006-03-07 KR KR1020067004684A patent/KR101078637B1/ko active IP Right Grant
Also Published As
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TW200510471A (en) | 2005-03-16 |
US7261934B2 (en) | 2007-08-28 |
JP4275138B2 (ja) | 2009-06-10 |
WO2005026241A1 (ja) | 2005-03-24 |
EP1666521B1 (en) | 2014-03-26 |
US20060263592A1 (en) | 2006-11-23 |
EP1666521A1 (en) | 2006-06-07 |
KR101078637B1 (ko) | 2011-11-01 |
KR20060119936A (ko) | 2006-11-24 |
TWI357424B (zh) | 2012-02-01 |
CN1849365A (zh) | 2006-10-18 |
EP1666521A4 (en) | 2008-01-23 |
JPWO2005026241A1 (ja) | 2006-11-16 |
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