CN1831984A - 用于光盘的保护膜和使用该膜的光盘 - Google Patents

用于光盘的保护膜和使用该膜的光盘 Download PDF

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CN1831984A
CN1831984A CNA2006100747477A CN200610074747A CN1831984A CN 1831984 A CN1831984 A CN 1831984A CN A2006100747477 A CNA2006100747477 A CN A2006100747477A CN 200610074747 A CN200610074747 A CN 200610074747A CN 1831984 A CN1831984 A CN 1831984A
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methyl
pressure sensitive
sensitive adhesive
adhesive layer
diaphragm
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宫田壮
中林正仁
久保田新
关谷昌彥
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Lintec Corp
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Lintec Corp
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Abstract

公开了一种用于光盘的保护膜,其包括可透光衬底膜和在其一侧上形成的压敏粘合剂层,其中可透光衬底膜和压敏粘合剂层之间折射率差为至多0.08,且压敏粘合剂层中的凝胶分数为至少65质量%;并公开了一种光盘,其中保护膜通过压敏粘合剂层粘合于信息记录层上。使用光盘保护膜的目的是保护光盘的信息记录层,尤其是蓝射线盘的信息记录层,其特征在于其决不会对光盘的记录特性产生不利影响,此外还能抑制光盘的金属反射膜和信息记录层的腐蚀。上述的光盘是高可靠的,且不会对光盘的信息记录和复制功能产生任何妨碍。

Description

用于光盘的保护膜和使用该膜的光盘
技术领域
本发明涉及一种用于光盘的保护膜和使用该膜的光盘。尤其是,本发明涉及一种用于光盘的保护膜,该膜用于保护光盘的信息记录层,尤其是蓝射线(Blu-ray)盘(BD)的信息记录层,且决不会对光盘的记录特性产生不利影响,其中每个用于光盘的金属反射膜和信息记录层的腐蚀被抑制;而且涉及一种光盘,其中上述的保护膜通过压敏粘合剂层粘合于信息记录层。
背景技术
近些年来,诸如CD和CD-ROM的信息只读盘、被称作MO或者MD的磁光盘和被称作CD-R的可记录光盘作为光盘已经得到了广泛的应用。目前,上述光盘的记录容量是大约650MB(兆字节),但是已经发展了一系列称作DVD(多功能数码光盘)的光盘,它具有更大的记录容量,特别是包括DVD-ROM(只读DVD)、DVD-R(可刻录DVD)、DVD-RAM(读写DVD)、DVD-RW(可擦写DVD)等的一系列DVD。这些DVD系列中的任何一种是由两个彼此粘合的衬底组成,在实际的应用中具有每一面4.7GB(千兆字节)每双面9.4GB的记录容量。为了记录和复制信息,使用波长大约在630至650nm的红色激光束。
然而,在目前的状况下DVD有以下问题,例如,就高清晰度电视而言,其容量/记录能力仅有大约30分钟。因而,为了DVD的普及,期望DVD具有每一面至少两小时的对高清晰度影像的容量/记录能力。为了这一目的,需要大容量的光盘,并且为了实现这种光盘,通过具有较短波长的激光束记录和复制成为必需的。
目前在此情况下,在使用具有波长大约为405nm的蓝色激光束方面进行了研究。然而,使用具有这样短波长的蓝色激光束使得缩小道距和凹坑尺寸(pit size)成为可能,却造成了因为短波长引起的聚焦深度变浅的问题,因此不可能将目前使用的标准和方法应用于其中各个厚度为0.6mm的衬底(衬底的总厚度为1.2mm)彼此粘合的DVD系列。这样,人们尝试,例如,在厚度为1.1mm的衬底上形成的信息记录层上粘合可透光保护膜,所述可透光保护膜由与衬底相同的原材料构成且厚度为0.1mm。在这种情况中,对使用能量束-可固化的粘合剂或压敏粘合剂作为保护膜的粘合方法进行了研究,且在这种情况中要求粘合剂和胶粘剂决不能对光盘的记录或复制功能带来妨碍。
在上述方法中,使用能量束-可固化粘合剂的粘合方法造成易产生不均匀厚度的问题,因为采用普通旋涂方法来涂布前述粘合剂。与前述不同,使用压敏粘合剂可以实现高度精确的厚度。
用于光盘的保护膜被粘合到一侧,在该侧上用于进行光盘记录和复制的光束是入射的。通过利用使用用于光盘的压敏粘合剂的传统的保护膜所生产的光盘使得用于保护膜的衬底和压敏粘合剂层之间的折射率相差大(一般地,压敏粘合剂层的折射率小于衬底的折射率)。因此,当激光束入射和从记录表面反射时,激光束的折射和反射在压敏粘合剂层和衬底膜之间的界面上产生,因此降低信号的强度或者对信号水平以干扰形式产生有害的影响。考虑到上述因素,衬底膜和压敏粘合剂层之间的折射率差优选为尽可能的小(例如,参考已公开的日本专利申请No.67468/2000(平成12))。
然而,因为压敏粘合剂层相比于衬底膜一般具有低的折射率,为了减小衬底膜和压敏粘合剂层之间的折射率差,考虑将具有高折射率的组分混入构成压敏粘合剂层的压敏粘合剂。然而,与具有高折射率的组分混合的压敏粘合剂在高温和高湿度的环境下由于析出具有高折射率组分的原因,增加了腐蚀每一个构成粘合体的金属反射膜或者信息记录层的风险。
发明内容
在这样的情况下,本发明的目的是提供一种用于光盘的保护膜,它用于保护光盘的信息记录层,尤其是蓝-射线盘(BD)的信息记录层,且其决不会对光盘的记录特性产生不利影响,其中抑制了每个用于光盘的金属反射膜和信息记录层的腐蚀;且同时提供了一种光盘,其中上述保护膜通过压敏粘合剂层粘合到信息记录层。
本发明的其它的目的通过下面所公开的详述变得显而易见。
为了实现上述目的,本发明人积累了广泛深入的研究结果。结果,发现了该目的可以通过用于光盘的保护膜来实现,所述保护膜用压敏粘合剂层配置在可透光衬底膜的一侧上,所述压敏粘合剂层与上述衬底膜的折射率差为至多某给定值并具有至少某给定值的凝胶分数,优选地压敏粘合剂层由含有(甲基)丙烯酸酯共聚物作为树脂质组分的压敏粘合剂组成,所述的(甲基)丙烯酸酯共聚物具有源于带有芳氧基烷基和/或芳烷基的(甲基)丙烯酸酯的结构单元。本发明通过前述研究结果和信息来完成。就是说,本发明提供如下内容。
1.一种用于光盘的保护膜,其包括可透光衬底膜和在其一侧上形成的压敏粘合剂层,其中可透光衬底膜和压敏粘合剂层之间的折射率差为至多0.08,且压敏粘合剂层的凝胶分数为至少65质量%。
2.如前述条款1所述的用于光盘的保护膜,其中构成压敏粘合剂层的压敏粘合剂由作为树脂质组分的(甲基)丙烯酸酯共聚物组成。
3.如前述条款2所述的用于光盘的保护膜,其中(甲基)丙烯酸酯共聚物具有源于带有芳氧基烷基和/或芳烷基的(甲基)丙烯酸酯的结构单元。
4.如前述条款2或3所述的用于光盘的保护膜,其中(甲基)丙烯酸酯共聚物具有在500,000到2,000,000范围的重均分子量。
5.如前述条款2-4中任一项所述的用于光盘的保护膜,其中在(甲基)丙烯酸酯共聚物中的未交联组分中的分子量为至多10,000的组分的比例为至多30质量%。
6.如前述条款1-5中任一项所述的用于光盘的保护膜,其中可透光衬底膜是聚碳酸酯基树脂膜。
7.如前述条款1-6中任一项所述的用于光盘的保护膜,其在405nm波长时的光透射率为至少87%。
8.一种光盘,其包括如前述条款1-7中任一项所述的用于光盘的保护膜,且所述保护膜通过压敏粘合剂层粘合到形成在光盘衬底至少一侧上的信息记录层上。
具体实施方式
根据本发明的用于光盘的保护膜意图保护信息记录层,且它由可透光衬底膜和在其一侧上形成的压敏粘合剂层所构成。本发明中,可透光衬底被用作上述的衬底膜。在此所提到的术语“可透光”意为对光盘所用的激光束有透明性,其中所述光盘施用前述保护膜。一般地,使用透过380到780nm波长范围内的可见光的膜。作为可透光衬底膜,可用的膜包括诸如丙烯酸基树脂、聚烯烃基树脂、聚碳酸酯基树脂和降冰片烯基树脂的透明树脂。然而,从防止弯曲等的能力的观点来看优选热膨胀系数与施用保护膜的光盘的热膨胀系数接近的树脂。因此,通常采用与衬底相同材料的树脂。因为目前聚碳酸酯基树脂通常用作用于光盘的树脂质衬底,聚碳酸酯基树脂膜通常也用于本可透光衬底膜。
优选地,可透光衬底膜具有尽可能平坦的表面,且可更不易引起双折射。当引起双折射时,该衬底不利地损害聚集的激光束的聚光因子(light condensingfactor)。而且优选地,厚度的不均匀尽可能小。厚度的不均匀是降低激光束的聚光因子的原因。而且,为了保护膜的表面即使当膜的表面与驱动器的光头接触时也不受到损伤,可以根据期望在与压敏粘合剂层相对的衬底膜的表面上安置一个刻痕防止层。根据用于施用了本发明保护膜的光盘的激光束的波长,适当任选可透光衬底膜的厚度,一般的范围在50至100μm,优选地50至90μm。
在根据本发明的用于光盘的保护膜中,可透光衬底膜和压敏粘合剂层之间的折射率差为至多0.08是必需的。当折射率差为至多0.08时,当激光束入射和从记录表面反射时,激光束的反射在压敏粘合剂层和衬底膜之间的界面上更不易产生,因此抑制了信号强度的降低或者作为干扰施加在信号水平的不利影响。上述的它们之间的折射率差优选为至多0.07,更优选为至多0.065。
就此而言,聚碳酸酯膜和聚甲基丙烯酸甲酯膜的近似折射率分别为1.58和1.49。
可透光衬底膜和压敏粘合剂层之间的折射率差通过使用阿贝(Abbe)折射率计(由Atago Co.,Ltd制造,商品名为阿贝折射计1T)测量它们的折射率,并且求出它们之间的差来确定。
在根据本发明的用于光盘的保护膜中,压敏粘合剂层的凝胶分数为至少65质量%是必需的。当其凝胶分数为至少65质量%时,可最小化未交联的组分,同时抑制由于未交联的组分的析出而腐蚀光盘中的金属反射膜和信息记录层。其凝胶分数优选为至少70质量%,更优选为至少75质量%,虽然未限定其上限,但是通常为约质量90%。
上述凝胶分数通过下述的方法测量。
<压敏粘合制层的凝胶分数>
用刮刀式涂胶机将构成压敏粘合剂层的压敏粘合剂施用到重可剥离膜(heavy releasable film)的剥离处理表面(由LINTEC公司制造,商品名为“SP-PET381031”),然后该膜在90℃加热大约1分钟使该粘合剂交联,以生产出厚度约25μm的压敏粘合剂层。该这样制成的层与轻可剥离膜(light releasable film)(由LINTEC公司制造,商品名为“SP-PET38GS”)层合以获得用于测量凝胶分数的薄片样品。所得到的薄片样品在23℃且相对湿度为50%的条件下放置一个星期,然后剥离该压敏粘合剂层,使用Soxhlet萃取器用乙酸乙酯回流萃取大约16个小时。风干不溶部分,然后在100℃下干燥10小时,在23℃且相对湿度为50%的条件下放置3个小时进行湿度调节。然后,通过测量样品的质量,通过下面的式子来计算其凝胶分数:
凝胶分数(%)=(干燥和湿度调节后不溶部分的质量)/(萃取前压敏粘合剂的质量)×100
凝胶分数可以通过树脂质组分的交联度来调节,例如,在生产(甲基)丙烯酸酯共聚物时。
此外,优选上述压敏粘合剂层在25℃具有至少10-4Pa的储能模量。当25℃时其储能模量为至少104Pa,粘附于光盘的保护膜的保持性能(hold property)增强。虽然未限定其储能模量的上限,但是为约106Pa。优选在25℃储能模量为104Pa至105Pa。上述的储能模量通过以下的方法测量。
<压敏粘合剂层在25℃的储能模量>
在25℃、1Hz使用粘弹性测量装置(由Rheometrics Co.,Ltd制造,商品名为DYNAMIC ANALYZER RDA II)测量厚度大约600μm的压敏粘合剂层的储能模量。
在根据本发明的用于光盘的保护膜中,优选采用由(甲基)丙烯酸酯共聚物作为树脂质组分组成的丙烯酸类压敏粘合剂,所述共聚物作为构成压敏粘合剂层的压敏粘合剂适合光学应用。
作为(甲基)丙烯酸酯共聚物,优选的示意性的共聚物具有(A)源于含芳氧烷基和/或芳烷基的(甲基)丙烯酸酯的且具有提高折射率作用的结构单元,(B)源于(甲基)丙烯酸酯的结构单元,所述(甲基)丙烯酸酯具有调节玻璃化转变温度的作用和其中酯部分中的烷基带有1至20个碳原子,(C)源于具有带有活性氢的官能团的单体且具有给予交联点的作用的结构单元和(D)如希望被引入的且包含源于不同于前述的单体的结构单元的共聚物。
在(甲基)丙烯酸酯共聚物中,形成上述源于含芳氧烷基和/或芳烷基的(甲基)丙烯酸酯的结构单元(A)的单体(a)由至少一种选自通式(I)所表示的(甲基)丙烯酸酯的物质举例证明:
其中R1是氢原子或甲基;A是具有6到20个全部碳原子且可具有取代基的芳基或芳氧基;R4是具有1到4个碳原子且可以具有羟基的亚烷基;和n是0、1或大于1的整数。
作为上述的由具有6至20个全部的碳原子且可具有取代基的A所示的芳基或芳氧基,可以提到的是苯基、1-萘基、2-萘基、苯氧基、1-萘氧基和2-萘氧基,每一个都可以在环上带有,例如,至少一个具有1到10个碳原子的烃基。由具有1到4个碳原子且可以具有羟基的R2所示的亚烷基可以是直链或支链的,且特别举例说明的是亚甲基、亚乙基、1,2-亚丙基、1,3-亚丙基、2-羟基-1,3-亚丙基和四亚甲基。优选地,n为约0到10。
作为上述由通式(I)所表示的(甲基)丙烯酸酯,提到的是(甲基)丙烯酸2-苯氧乙酯、(甲基)丙烯酸2-(2-苯氧乙氧基)乙酯、(甲基)丙烯酸2-羟基-3-苯氧丙酯、(甲基)丙烯酸2-(4-异丙苯氧基)乙酯、(甲基)丙烯酸2-(1-萘氧基)乙酯、(甲基)丙烯酸2-(2-萘氧基)乙酯、(甲基)丙烯酸苯甲酯、(甲基)丙烯酸苯乙酯、(甲基)丙烯酸3-苯丙酯、(甲基)丙烯酸1-萘甲酯、(甲基)丙烯酸2-萘甲酯、对枯基苯氧基(甲基)丙烯酸酯乙二醇(para-cumyl phenoxy(meth)acrylateethylene glycol)等。任何一种(甲基)丙烯酸酯可以单独或与至少一种其他的丙烯酸酯联合使用,并且因为提高折射率而不明显升高待生成的(甲基)丙烯酸酯共聚物的玻璃化转变温度(Tg)的能力而特别优选(甲基)丙烯酸2-苯氧乙酯。
形成结构单元(B)、源于(甲基)丙烯酸酯、具有调节玻璃化转变温度的功能、且其中酯部分中的烷基带有1至20个碳原子的单体(b)举例为(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸异丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸己酯、(甲基)丙烯酸环己酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸十四烷基酯、(甲基)丙烯酸十六烷基酯、(甲基)丙烯酸十八烷基酯等。上述任何一种(甲基)丙烯酸酯可以单独使用或与至少一种其他的丙烯酸酯联合使用。
在这些中,特别优选丙烯酸正丁酯和/或丙烯酸2-乙基己酯,其作为压敏粘合剂能提供适当的Tg。
形成结构单元(C)的、源于具有带有活性氢的官能团的单体的且其具有给予交联点的作用的单体(c)举例为羟烷基(甲基)丙烯酸酯诸如2-羟乙基(甲基)丙烯酸酯、2-羟丙基(甲基)丙烯酸酯、3-羟丙基(甲基)丙烯酸酯、2-羟丁基(甲基)丙烯酸酯、2-羟丁基(甲基)丙烯酸酯和4-羟丁基(甲基)丙烯酸酯;丙烯酰胺类诸如丙烯酰胺、甲基丙烯酰胺、N-甲基丙烯酰胺、N-甲基甲基丙烯酰胺、N-羟甲基丙烯酰胺和N-羟甲基甲基丙烯酰胺;单烷基氨基烷基(甲基)丙烯酸酯诸如单甲基氨基乙基(甲基)丙烯酸酯、单乙基氨基乙基(甲基)丙烯酸酯、单甲基氨基丙基(甲基)丙烯酸酯和单乙基氨基丙基(甲基)丙烯酸酯;和烯键式不饱和羧酸诸如丙烯酸、甲基丙烯酸、巴豆酸、马来酸、衣康酸和柠康酸。上述任何单体可以单独使用或者与至少一种其它单体联合使用。
形成结构单元(D)的、源于另一单体的、且如希望被引入的单体(d)举例为乙烯基酯诸如乙酸乙烯酯和丙酸乙烯酯;烯烃诸如乙烯、丙烯和异丁烯;卤代烯烃诸如氯乙烯和偏二氯乙烯;苯乙烯类单体诸如苯乙烯和α-甲基苯乙烯;二烯基单体诸如丁二烯、异戊二烯和氯丁二烯;腈基单体诸如丙烯腈和甲基丙烯腈,以及N,N-二烷基取代的丙烯酰胺类诸如N,N-二甲基丙烯酰胺的N,N-二甲基甲基丙烯酰胺。上述任何单体可以单独使用或者与至少一种其它单体联合使用。
在丙烯酸类压敏粘合剂中,根据要形成的压敏粘合剂层中的折射率、凝胶分数、如希望的各个压敏粘合剂的Tg,适当任选地选择待用作树脂质组分的(甲基)丙烯酸酯共聚物中的各个结构单元的含量。一般,(A)单元的含量为0到99.9质量%,(B)单元的含量为0到99.9质量%,(C)单元的含量为0.1到20质量%,(D)单元的含量为0到5质量%。优选地,(A)单元的含量为40到90质量%,(B)单元的含量为10到60质量%,(C)单元的含量为0.1到5质量%,(D)单元的含量为0到5质量%。
在上述的丙烯酸类压敏粘合剂中,不具体限定待用作树脂质组分的(甲基)丙烯酸酯基共聚物的聚合***,可以是任何无规、嵌段和接枝共聚物。优选地,从防止对光盘的不利影响并保证其可靠性的方面考虑,就重均分子量而言,共聚物的分子量在500,000到2,000,000的范围内。
通过凝胶渗透色谱法(GPC)测量前述重均分子量,以聚苯乙烯表示。
另外,从抑制金属反射膜、信息记录层等的腐蚀的方面考虑,优选使(甲基)丙烯酸酯基共聚物中非交联组分中的低分子量共聚物的含量最小化。更具体地,非交联组分中分子量为10,000或更小的组分比例优选为至多30质量%,特别优选为至多25质量%,基于非交联组分计。术语“(甲基)丙烯酸酯基共聚物中的非交联组分”指在上述凝胶分数测量中用乙酸乙酯萃取的组分。
(甲基)丙烯酸酯共聚物的玻璃化转变温度(Tg)一般为-60到-10℃,优选为-50到-20℃。
在本发明中,该(甲基)丙烯酸酯共聚物可单独使用或与至少一种其它种类联合使用。
可通过常规的方法生产(通过聚合)本发明中的(甲基)丙烯酸酯共聚物。使用的溶剂是,例如乙酸乙酯、甲苯等。使用的聚合引发剂是,例如偶氮二(异丁腈)、过氧化苯甲酰等。对条件不作具体限定的聚合反应一般在50到90℃的条件下进行2到30小时。
本发明中使用的丙烯酸类压敏粘合剂可包含交联剂。对其无具体限定,可根据按照本发明施加了保护膜的光盘的各个反射膜和信息记录层的类型,任意从迄今在丙烯酸类压敏粘合剂中常采用的那些交联剂里选择使用,例如聚异氰酸酯化合物、环氧树脂、密胺树脂、尿素树脂、二醛、羟甲基聚合物、金属螯合化合物、金属醇盐和金属盐。不具体限定交联剂的含量,一般基于100质量份(甲基)丙烯酸酯共聚物,为0.01到20质量份。
在本发明中,从抑制金属反射膜腐蚀等方面,优选采用包含0.005到10质量%抗氧化剂的丙烯酸类压敏粘合剂。其至少0.005质量%的抗氧化剂含量充分显示出在抑制金属反射膜、信息记录层等腐蚀方面的效果。考虑到增加的含量,其超过10质量%的抗氧化剂含量在增强所述效果方面不是那么有效,因此在这种情况下可能带来不经济的缺点。其含量更优选在0.01到5质量%的范围,特别优选在0.1到3质量%。
上述抗氧化剂无具体限定,可从以前公知的那些抗氧化剂中适当任选地选择使用,如受阻酚基抗氧化剂、胺基抗氧化剂、硫基抗氧化剂、磷基抗氧化剂和醌基抗氧化剂。这些当中,优选使用受阻酚基抗氧化剂。具体地,单环酚基抗氧化剂优选提及的有2,6-二-叔丁基-p-甲酚、丁基羟基苯甲醚、β-(3,5-二-叔丁基-4-羟基苯基)丙酸十八酯等;双环受阻酚基抗氧化剂优选提及的有4,4’-亚丁基双(3-甲基-6-叔丁基-苯酚)、双[3-(3-叔丁基-4-羟基-5-甲基苯基)丙酸3,6-二氧杂辛二酯等;三环酚基抗氧化剂优选提及的有1,1,3-三(2-甲基-4-羟基-5-叔丁基苯基)丁烷等;四环酚基抗氧化剂优选提及的有四[亚甲基-3-(3’-5’-二-叔丁基-4’-羟苯基)丙酸酯]甲烷等。任何上述抗氧化剂可单独使用或与至少一种其它种类的联合使用。
从抑制根据本发明的用于光盘的保护膜的衬底膜和用于光盘的衬底的腐蚀,以及抑制各个光盘的金属反射膜和信息记录层的腐蚀的方面考虑,优选丙烯酸类压敏粘合剂具有的残留溶剂和残留单体的总含量以质量计为至多100ppm。当残留溶剂和残留单体的总含量以质量计为至多100ppm时,保护膜的衬底膜和光盘的衬底的腐蚀被基本抑制。残留溶剂和残留单体的总含量更优选为以质量计至多50ppm,最优选为以质量计至多20ppm。
根据本发明的用于光盘的保护膜中,可将上述丙烯酸类压敏粘合剂直接施用于可透光衬底膜的一侧上以在其上形成压敏粘合剂层。可选择地,可将丙烯酸类压敏粘合剂施用于剥离薄片上形成压敏粘合剂层,此后在衬底膜的一侧上叠加获得的层以从那里转移该层。在这种情况下,当需要时,可如此附着剥离薄片而不剥离,而在使用保护膜时将其剥离。在衬底膜的一侧上所要形成的压敏粘合剂层的厚度一般在约5到60μm的范围,优选约10到30μm。上述的剥离薄片,可提及的有,例如,诸如玻璃纸、铜版纸和高光泽印刷纸的纸衬底,上述纸衬底与诸如聚乙烯的热塑树脂一起层压的层压纸,诸如由聚对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯或聚萘二甲酸乙二醇酯组成的聚酯膜和由聚乙烯或聚丙烯组成的聚烯烃膜的塑料膜,其用诸如有机硅树脂的防粘剂涂覆。不具体限定剥离薄片的厚度,但是一般为约20到150μm。
在将丙烯酸类压敏粘合剂施用于可透光衬底膜的一侧上或剥离薄片上时,一般往里加入诸如乙酸乙酯或甲苯的溶剂,并于此后通过将涂层在70℃或更高温度,优选在80到150℃加热10秒到10分钟而将涂层干燥形成压敏粘合剂层。
优选地,根据本发明的用于光盘的保护膜在405nm的波长下至少具有87%的光透射率,由于它被施用于光盘,尤其是蓝射线盘。在405nm的波长下,当光透射率为至少87%时,有利于入射到蓝射线盘的信息记录层的激光束的透射,和有利于来自记录(recoding)表面的反射光的透射。前述光透射率优选为至少89%,更优选为至少90%。
根据本发明的光盘是这样的光盘,其中用于光盘的保护膜通过压敏粘合剂层粘接到在用于光盘的衬底的至少一侧上形成的信息记录层上。
不具体限定根据本发明的光盘中的衬底,条件是其可用在普通光盘中,并且一般使用聚碳酸酯树脂。根据光盘的总厚度的规格、在信息记录层上待形成的保护膜的厚度等适当任选地选择衬底的厚度,一般在1.05到1.15mm的范围。在衬底上待形成的功能层的结构仅需要普通光盘的结构,不需要具体限定。例如,在ROM情况下(只读存储器),仅需要通过溅射或类似的方法形成作为信息记录层的金属反射膜。在能够写和读的情况下,列举一种层结构,其中,在反射膜上通过使用相位变化类型和光磁类型记录材料形成信息记录层,其是由介电层、记录材料层和介电层组成。作为反射膜使用的有,例如银合金膜、铝膜、铝合金膜或类似物。作为信息记录层中的记录材料,作为相位变化类型使用的有,TeOx、Te-Ge、Sn-Te-Ge、Bi-Te-Ge、Sb-Te-Ge、Pb-Sn-Te等;作为光磁类型的有,Tb-Fe、Tb-Fe-Co、Dy-Fe-Co、Tb-Dy-Fe-Co等。作为信息记录层中的介电层使用的有,例如,SiN、SiO、SiO2、ZnS-SiO2、Ta2O5等。可用于根据本发明的光盘中的蓝激光束特别优选用于高容量的蓝射线盘系列,诸如BD-ROM、BD-R、BD-RAM等。
本发明的工作效应、优点和工业应用概括如下。使用根据本发明的光盘保护膜的目的是保护光盘的信息记录层,尤其是蓝射线盘的信息记录层,其特征在于其决不会对光盘的记录特性产生不利影响,此外还能抑制光盘的金属反射膜和信息记录层的腐蚀。本发明还能提供高可靠性光盘,而不会对光盘的信息记录和复制功能产生任何妨碍。
实施例
在下文中,将根据比较实施例和工作实施例详细描述本发明,然而这些实施例又绝不应限制本发明。
根据下面的方法评价各个比较实施例和工作实施例的不同特性。
(1)压敏粘合剂层的折射率
通过在光盘保护膜中使用阿贝折射计(Atago Co.,Ltd制造,商品名为“阿贝折射计1T”),在25℃的环境下通过钠D束(波长为589.3nm)辐照测量压敏粘合剂层的折射率。
(2)压敏粘合剂层的凝胶分数
根据本说明书正文中的描述进行其测量。
(3)光盘保护膜在405nm的波长下的光透射率
用紫外可见分光光度计(由Shimadzu Corporation制造,商品名称为UV-3100PC)对这样形成的光盘保护膜在405nm的波长下测量光透射率。
(4)光盘保护膜中的反射率的变化率
通过用这样形成的压敏粘合剂层将这样形成的光盘保护膜粘合于银合金膜上制备用于测量反射率的样品。然后,用下面描述的方法测量样品对405nm波长的射线的初始反射率Ra,并测量在相对湿度为85%的环境中被放置1000小时的样品对405nm波长的射线的反射率Rb。
通过来自可透光膜的一侧405nm波长的辐照射线,用紫外可见分光光度计(由Shimadzu Corporation制造,商品名称为UV-3100PC)测量这样形成的光盘保护膜在405nm波长下的反射率。
接着从下面的关系式确定反射率的变化率(Y)。
Y(%)=[(Ra-Rb)/Ra]×100
(5)在非交联组分中具有10,000或更低的重均分子量的(甲基)丙烯酸酯共聚物的比例。
测量在用GPC方法测量凝胶分数时用乙酸乙酯萃取的(甲基)丙烯酸酯共聚物(非交联组分)的重均分子量和分子量分布,并从在图表中获得的峰面积的比值计算其比例。使用GPC装置(由Tosoh Corporation制造,商品名“HLC-8020)和三个串联连接的柱TSKGelGMHXL-TSKGelGMHXL-TSKGel G2000HHLXL(全部由Tosoh Corporation制造)进行GPC测量。
实施例1
向由40质量份的丙烯酸正丁酯、57质量份的丙烯酸2-苯氧基乙酯和3质量份的丙烯酸组成的单体混合物中加入150质量份的乙酸乙酯作为溶剂和0.1质量份的偶氮二(异丁腈)作为聚合引发剂,在氮气氛中在60℃持续17小时进行聚合,以便获得共聚物溶液,所述共聚物溶液具有540,000的重均分子量和-25℃的玻璃化转变温度且其由丙烯酸正丁酯/丙烯酸2-苯氧基乙酯/丙烯酸组成。随后,以100质量份共聚物溶液中的固体组分计,将3.0质量份的聚异氰酸酯基的交联剂(由Toyo InkMfg Co.,Ltd.制造,商品名为BHS-8515)加入其中以制备压敏粘合剂的涂层溶液。
用刮刀涂布机将这样得到的涂层溶液涂敷到释放膜(由LINTEC Corporation制造,商品名为“SP-PET381031”)的释放处理表面,以使干燥后的涂层厚度为20μm。将得到的涂层在90℃下持续干燥约1分钟,然后与作为可透光衬底膜的厚度为80μm的聚碳酸酯膜层合以制备厚度为约100μm的光盘保护膜。在表1中给出这样得到的保护膜的各种特性。
实施例2
除了作为单体混合物使用的混合物为20质量份的丙烯酸正丁酯、77质量份的丙烯酸2-苯氧基乙酯和3质量份的丙烯酸外,重复实施例1中的步骤以制备具有500,000的重均分子量和-22℃的玻璃化转变温度的共聚物溶液,然后制备压敏粘合剂的涂层溶液。随后,通过使用获得的压敏粘合剂的涂层溶液制备厚度为约100μm的光盘保护膜。在表1中给出这样得到的保护膜的各种特性。
比较例1
除了添加的聚异氰酸酯基的交联剂由0.5质量份替代3质量份之外,重复实施例1中的步骤以制备压敏粘合剂的涂层溶液和厚度为约100μm的光盘保护膜。在表1中给出这样得到的保护膜的各种特性。
比较例2
除了不使用丙烯酸2-苯氧基乙酯且丙烯酸正丁酯的用量为97质量份外,重复实施例1中的步骤以制备具有650,000的重均分子量和-41℃的玻璃化转变温度的共聚物溶液,然后制备压敏粘合剂的涂层溶液。
随后,通过使用获得的压敏粘合剂的涂层溶液,以与实施例1中同样的方式获得厚度为约100μm的光盘保护膜。在表1中给出这样得到的保护膜的各种特性。
表1
    实施例1     实施例2     比较例1     比较例2
压敏粘合剂层 凝胶分数(质量%)     82.6     77.4     45.0     74.9
非交联组分中(甲基)丙烯酸酯共聚物(M.W.≤10,000)的比例 22 24 28 20
折射率     1.521     1.540     1.520     1.468
折射率差(Δn) 0.062 0.043 0.063 0.115
保护膜 对波长405nm的射线的光透射率(%) 90.7 90.1 88.5 89.9
反射率的变化率(%)     2.4     1.7     4.5     1.9
衬底膜(聚碳酸酯膜)的折射率为1.583。

Claims (8)

1.一种用于光盘的保护膜,其包括可透光衬底膜和在其一侧上形成的压敏粘合剂层,其中可透光衬底膜和压敏粘合剂层之间折射率差为至多0.08,且压敏粘合剂层中的凝胶分数为至少65质量%。
2.如权利要求1所述的用于光盘的保护膜,其中构成压敏粘合剂层的压敏粘合剂由作为树脂质组分的(甲基)丙烯酸酯共聚物组成。
3.如权利要求2所述的用于光盘的保护膜,其中(甲基)丙烯酸酯共聚物具有源于带有芳氧基烷基和/或芳烷基的(甲基)丙烯酸酯的结构单元。
4.如权利要求2或3所述的用于光盘的保护膜,其中(甲基)丙烯酸酯共聚物具有在500,000到2,000,000范围的重均分子量。
5.如前述权利要求2-4中任一项所述的用于光盘的保护膜,其中在(甲基)丙烯酸酯共聚物中的非交联组分中的分子量为至多10,000的组分的比例为至多30质量%。
6.如前述权利要求1-5中任一项所述的用于光盘的保护膜,其中可透光衬底膜是聚碳酸酯基树脂膜。
7.如前述权利要求1-6中任一项所述的用于光盘的保护膜,其在405nm波长时的光透射率为至少87%。
8.一种光盘,其包括如前述权利要求1-7中任一项所述的用于光盘的保护膜,且保护膜通过压敏粘合剂层粘合到在光盘衬底的至少一侧上形成的信息记录层上。
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JP4658616B2 (ja) 2011-03-23
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