CN117355404A - 热压用缓冲材料 - Google Patents
热压用缓冲材料 Download PDFInfo
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- CN117355404A CN117355404A CN202280035892.1A CN202280035892A CN117355404A CN 117355404 A CN117355404 A CN 117355404A CN 202280035892 A CN202280035892 A CN 202280035892A CN 117355404 A CN117355404 A CN 117355404A
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- 239000000872 buffer Substances 0.000 claims abstract description 33
- 239000003365 glass fiber Substances 0.000 claims abstract description 27
- 239000002861 polymer material Substances 0.000 claims abstract description 27
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Abstract
热压用缓冲材料(10)具有缓冲部(1)。缓冲部(1)包含:在经纱(5a)或纬纱(5b)的至少一者采用了合捻纱的织布(5)、以及附着于构成织布(5)的纤维的表面的聚合物材料(6)。织布(5)的经纱(5a)或纬纱(5b)的至少一者采用的合捻纱是将由玻璃纤维构成的多根膨松纱合捻而形成的。
Description
技术领域
本发明涉及热压用缓冲材料。
背景技术
在制造覆铜层叠板、柔性印刷基板、多层板等印刷基板、IC卡、液晶显示板、陶瓷层叠板、电子部件等精密机器部件(以下统称为“层叠板”)时,会进行加压成型或热压接等热压。
图8为用来说明对印刷基板等进行加压成型或热压接的加压装置的图。此加压装置具备相向的一对热盘13、13。一对热盘13、13为对印刷基板等进行加热·加压的手段。加压装置用一对热盘13、13夹住作为层叠板材料的被加压材料12,并以一定的压力及热对其加压。此时,为了使施加于被加压材料12的热及压力在整个面均匀化,会在热盘13与被加压材料12之间***平板状的缓冲材料11。在图8中,还在缓冲材料11与被加压材料12之间***不锈钢制的镜面板14。
作为缓冲材料11要求的一般特性,可列举出:吸收热盘13及被加压材料12具有的凹凸的缓冲性、用于以使整个加压面内的温度及压力均匀的方式将热及力从热盘13传递到被加压材料12的面内均匀性、用于有效率地将热从热盘13传递到被加压材料12的热传递性、以及可耐受加压温度的耐热性等。
例如,专利文献1中公开了一种热压用缓冲材料,其具备纤维-橡胶复合材料层,该纤维-橡胶复合材料层包含:在经纱及纬纱的至少一者采用由玻璃纤维构成的膨松纱的织布、以及浸渗于该织布中的橡胶。该热压用缓冲材料在纤维-橡胶复合材料层的内部设置有空隙,而能够发挥良好的缓冲性。
现有技术文献
专利文献
专利文献1:日本特开2008-132656号公报
发明内容
发明要解决的问题
一般而言,热压用缓冲材料会重复使用,因此会要求要有耐久性。专利文献1通过喷气加工进行单纱的开纤或合捻纱的膨松,并将具有如毛线般的膨松感的膨松纱(bulkyyarn)用于织布,由此提高织布的空隙率,实现良好的缓冲性。本发明的发明人等尝试了大量使用喷气加工而使其更加膨松,使膨松纱的粗度变得更粗,由此提高缓冲性及耐久性。结果却发现,在此情况下,过多使用的喷气加工会使玻璃纤维折断,虽然初期的缓冲性高,但随着使用次数增多,特性会大幅降低,热压用缓冲材料的耐久性变差。
因此,鉴于上述问题,本发明的目的在于,提供即使在反复使用的情况下也可维持良好的缓冲性的耐久性优异的热压用缓冲材料。
用于解决问题的方案
为了达成上述目的,本发明的特征在于,为具有缓冲部的热压用缓冲材料,
前述缓冲部包含:
经纱或纬纱中的至少一者采用了合捻纱的织布;以及
附着于构成前述织布的纤维的表面的聚合物材料,
前述合捻纱是将由玻璃纤维构成的多根膨松纱合捻而形成的。
发明的效果
根据本发明,可提供即使在反复使用的情况下也可维持良好的缓冲性的耐久性优异的热压用缓冲材料。
附图说明
图1表示实施方式的热压用缓冲材料。
图2表示通常的玻璃纤维纱。
图3表示由玻璃纤维构成的膨松纱。
图4为表示将多根膨松纱合捻而成的膨松纱复合捻纱的图。
图5为表示另一实施方式的热压用缓冲材料的图。
图6为表示另一实施方式的热压用缓冲材料的图。
图7是将表1绘制成曲线图而成者。
图8为用来说明对印刷基板等进行加压成型或热压接的加压装置的图。
具体实施方式
以下,参照图来详细说明本发明的热压用缓冲材料。
[本实施方式的热压用缓冲材料]
图1表示本实施方式的热压用缓冲材料10。如图1所示,热压用缓冲材料10至少具备缓冲部1。缓冲部1为由织布5以及附着于构成织布5的纤维的表面的聚合物材料6构成的、片状的缓冲构件(缓冲片)。缓冲部1在内部含有空隙7。
在缓冲部1中,织布5的经纱5a或纬纱5b的至少一者为合捻纱。合捻纱是将由玻璃纤维构成的多根膨松纱(texturized yarn)合捻而形成的。以下,将这种合捻纱称为“膨松纱复合捻纱”。图1中,经纱5a为通常的玻璃纤维纱,纬纱5b为膨松纱复合捻纱。需要说明的是,经纱5a也可与纬纱5b同样为膨松纱复合捻纱。
在此,针对膨松纱及膨松纱复合捻纱进行说明。
图2为表示通常的玻璃纤维纱1a的图,图3为表示由玻璃纤维构成的膨松纱1b的图,图4为表示将多根膨松纱合捻而成的膨松纱复合捻纱1c的图。
图2所示的玻璃纤维纱1a为单纱、多根单纤维聚集成束而成的粗纱(rovingyarn)、或将多根单纱或粗纱合捻而成的纱。图3所示的膨松纱1b与图2所示的玻璃纤维纱1a不同,为构成玻璃纱的短纤维彼此以互相缠绕、紊乱的状态而非平行状态并丝而成的占有面积大的纱。换言之,膨松纱具有如毛线般的膨松,因此采用膨松纱的织布与通常的织布不同,内部会含有很多空隙。膨松纱1b因为纱体本身含有很多空隙,因此可使聚合物材料适度地浸渗。
膨松纱1b为对玻璃纤维的纱进行膨松加工而得到的膨体纱(bulked yarn)。膨体纱为进行纱的开纤或合捻纱的膨松而具有如毛线般的膨松感的加工纱。
膨松纱1b除了可采用膨体纱之外,也可采用短纤维纱(staple yarn)、纱条(sliver yarn)等。短纤维纱为将绵状的玻璃短纤维纺成纱状而成者。纱条为将未捻过的膨松的短纤维(条:sliver)加以捻合而成的纱。
本实施方式的膨松纱1b优选将1000根~15000根玻璃纤维的单纤维聚集成束而成。这是为了得到适度的缓冲性及足够的耐久性。单纤维的根数更优选1500根以上,进一步优选2000根以上。进而,单纤维的根数更优选12000根以下,进一步优选10000根以下。另外,在膨松纱为合捻纱的情况下,其捻数太少会有耐久性差的担心,太多则会有缓冲性降低的担心,因此每玻璃纤维的长度1英寸优选0.1~10次,更优选0.5~5次。构成膨松纱的玻璃纤维的单纤维的直径优选为3~11μm。这是因为,单纤维的直径未满3μm的情况下,在制造上会难以加工且单纤维的必要数目变多,而比11μm粗的情况下,纤维会容易折断而对特性造成不良影响。
一般的合捻纱指的是将多根纱合捻而成者,作为本发明的合捻纱的图4所示的膨松纱复合捻纱1c指的是,将多根(图4中为三根)图3所示的膨松纱1b合捻而形成者。也即,用于本发明的膨松纱复合捻纱是将多根膨松纱合捻而成的,与例如将合捻纱进一步合捻并最后进行膨松加工而成的膨松纱有明确的区别。需要说明的是,为了得到良好的缓冲性及足够的耐久性,膨松纱复合捻纱的单纤维的总根数优选为3000根~100000根。单纤维的根数优选为4500根以上,更优选为6000根以上。另外,单纤维的根数更优选为80000根以下,进一步优选为60000根以下。进而,膨松纱复合捻纱的捻数可设定为例如每膨松纱长度1英寸为1~4次。
为了提高缓冲部1的缓冲性,只要增加织布5的经纱5a或纬纱5b的单纤维的根数即可,但单纯增加时,会因压缩而容易扁平化,缓冲部1的耐久性会降低。因此,本发明的发明人等为了得到良好的缓冲性及足够的耐久性,不只是单纯地使织布5的经纱5a或纬纱5b的至少一者为膨松纱,还进一步将多根膨松纱合捻而形成膨松纱复合捻纱1c。
缓冲部1为片状物。缓冲部1的厚度太薄就会有缓冲性不良的担心,太厚则会有热传递性不良的担心。因此,虽然用途不同也会有差异,但缓冲部1的适当的厚度设定在例如0.5~5.0mm的范围内为宜。此外,在将两层以上的缓冲部1层叠而使用的情况下,以将合计厚度设定在0.5~5.0mm的范围内为宜。
回到图1进行说明。在缓冲部1中,在构成织布5的纤维的表面附着有聚合物材料6。聚合物材料6适度地进入膨松纱复合捻纱所具有的空隙7及编织结构的空隙7内,但并未完全填满空隙7,因此缓冲部1中残存有空隙7。因此,本实施方式的热压用缓冲材料10会发挥良好的缓冲性。进而,本实施方式的热压用缓冲材料10是膨松纱复合捻纱织成的,为织布的形状,因此与无纺布相比较,单位面积重量精度良好,面内均匀性优异。另外,本实施方式的热压用缓冲材料10因为是织布的形状,因此厚度可比无纺布薄,可使得热传递性也优异。
聚合物材料6并没有特别的限制,可采用合成橡胶或合成树脂。作为聚合物材料6,具体而言,合成橡胶可列举:氟橡胶、EPM、EPDM、氢化丁腈橡胶(hydrogenated nitrilerubber)、硅橡胶、丙烯酸橡胶、丁基橡胶等,合成树脂可列举:氟树脂、聚酰亚胺树脂、聚酰胺树脂、聚醚醚酮树脂等。聚合物材料优选具有高于加压温度的热分解温度(5%重量减少温度)及玻璃化转变温度。从此观点来说,特别优选的聚合物材料为氟橡胶及聚酰亚胺树脂。
聚合物材料在保护玻璃纤维的同时将纤维的接点(除了经纱与纬纱的接点之外,也包含构成膨松纱的长丝纤维彼此的接点)结合。因此,采用聚合物材料6的热压用缓冲材料10可减少反复使用于热压时的玻璃纤维的破损,且抑制织布5的所谓的溢浆,可维持良好的缓冲性。
(缓冲部1的缓冲性)
将以230℃的温度、0.01kgf/cm2的加压力压缩热压用缓冲材料10时的厚度表示为t1,将以230℃的温度、40kgf/cm2的加压力压缩热压用缓冲材料10时的厚度表示为t2时,热压用缓冲材料10的缓冲性Fn可表示为(t1-t2)×1000/t2。
需要说明的是,以上述的加压试验条件对热压用缓冲材料10进行压缩时的厚度t1、t2可用Instron万能材料试验机(Instron公司制)、AUTOGRAPH精密万能试验机(株式会社岛津制作所制)等具有压缩功能的试验机测定出。
如此测定而算出的缓冲性Fn优选为400以上。在这样的范围内时,可对热压用缓冲材料10赋予足够的缓冲性。Fn值的更优选的范围为420以上,更优选的范围为450以上。
(膨松纱复合捻纱的灼烧减量)
为了抑制织布5的溢浆而维持热压用缓冲材料10的良好的特性,使聚合物材料6附着于构成缓冲部1的织布5的纤维的表面。优选设定聚合物材料6的附着量使得:在进行灼烧减量试验时,从热压用缓冲材料10取出的附着有聚合物材料6的膨松纱复合捻纱的灼烧减量(LOI:Loss on Ignition)在5~30质量%。需要说明的是,灼烧减量更优选为8质量%以上。此外,灼烧减量更优选为25质量%以下。所谓的灼烧减量试验,是指高温加热从热压用缓冲材料10取出的膨松纱复合捻纱,测定使聚合物材料6的成分的一部分挥发后的膨松纱复合捻纱的重量变化的试验。
作为灼烧减量的试验方法,首先从热压用缓冲材料采取出边长为50mm的正方形的样品,从该样品拔出10根膨松纱复合捻纱。也即,准备10根长50mm的膨松纱复合捻纱。将这些试料充分干燥后,以装在坩埚内的状态进行秤重。将此时的重量表示为ma。
然后,将装有试样的坩埚放入马弗炉,以约650℃加热约一小时后,秤量装有试样的坩埚的重量。将此时的重量表示为mb。
若将坩埚的质量表示为mc,则灼烧减量LOI可用下式表示。
LOI=(ma-mb)/(ma-mc)×100
[另一实施方式的热压用缓冲材料]
热压用缓冲材料10只要至少具备缓冲部1即可,也可只具备缓冲部1。热压用缓冲材料10的缓冲部1可为一层,也可为多层。
图5为表示另一实施方式的热压用缓冲材料10a的图。如图5所示,在热压用缓冲材料10a中,在缓冲部1的表面借助粘接层部3而层叠有表层部2。表层部2主要是为了赋予热压用缓冲材料脱模性而设置。表层部2的材料可使用合成树脂薄膜、或是在由织布所构成的基材的表面侧涂布脱模性树脂而形成者等。尤其,为了能够承受高温加压,优选使用即使在高温使用时尺寸稳定性也良好、不会变形、密接而脱模性良好的材料。此外,表层部2的厚度优选例如为0.1~0.5mm。另外,粘接层部3以采用与缓冲部1相同的聚合物材料为宜。
图6为表示另一实施方式的热压用缓冲材料10b的图。如图6所示,在热压用缓冲材料10b中,两层缓冲部1借助粘接片部4而层叠。此外,在各缓冲部1的上下的表面分别借助粘接层部3而层叠有表层部2。缓冲部1是使聚合物材料浸渗于玻璃纤维制的织布中而构成的,因此其厚度有限制,为像这样将两层缓冲部1层叠的构成时,具有可使缓冲部1的总厚度更厚的优点。另外,缓冲部1间的粘接虽然也可以只利用粘接剂进行,但在此情况下,会有粘接剂填埋缓冲部1的编织结构的间隙而导致缓冲性降低的情况。因此,优选采用粘接片部4。需要说明的是,粘接片部4例如为在由通常的玻璃纤维纱1a所构成的平织的织布涂布粘接剂而构成的片状的粘接层。该粘接剂与缓冲部1同样地采用聚合物材料为宜。为了防止从侧面起的纤维绽开、绒毛脱落,可用耐热树脂被覆所制造的热压用缓冲材料的侧面。
[实施方式的热压用缓冲材料的制造方法]
首先,准备经纱或纬纱的至少一者为膨松纱复合捻纱的织布。膨松纱复合捻纱是将由玻璃纤维构成的膨松纱(glass bulky yarn:玻璃膨体纱)多根合捻而形成的。织布的编织方式并没有限制,可采用例如平织、斜纹织、其它公知的编织方式。
接着,使聚合物材料(氟橡胶或聚酰亚胺树脂等)附着于构成织布的纤维的至少表面。例如,在聚合物材料为氟橡胶的情况下,可将织布浸渍于以规定的浓度将未硫化氟橡胶溶解而成的未硫化氟橡胶溶液后,使其充分地干燥,由此使氟橡胶附着于构成织布的纤维的表面,而制作出缓冲部(缓冲片)1。此外,在聚合物材料为聚酰亚胺树脂的情况下,例如可将规定的浓度的聚酰亚胺树脂清漆涂布于织布,然后使其充分地干燥,由此使聚酰亚胺树脂附着于构成织布的纤维的表面,而制作出缓冲部(缓冲片)1。
聚合物材料的附着量以设置为例如20~300g/m2为宜。聚合物材料的附着量可通过用树脂辊、橡胶辊、金属辊等拧挤来调整。此外,聚合物材料的附着量如上所述优选设置成使得在进行灼烧减量试验时,从热压用缓冲材料取出的附着有聚合物材料的膨松纱复合捻纱的灼烧减量在5~30质量%。
如此操作而得到的在纤维的表面附着有聚合物材料的织布由于成为纤维被固定且被覆盖的状态,因此即使是在高温下使用,也可维持织布的形状及空隙。因此,即使在重复使用的情况下也可确保良好的缓冲性。
热压用缓冲材料在具有表层部(表层片)2的情况下,例如可采用如下的表层片:在作为基材的片材的成为表面侧的一面涂布成为表层部2的聚酰亚胺树脂,并使之干燥后,在成为粘接面侧的另一面涂布作为粘接层部3的氟橡胶或聚酰亚胺树脂,然后使之干燥而得到的表层片。
热压用缓冲材料在具有粘接片部(粘接片)4的情况,例如可采用如下的粘接片4:在作为基材的片材的两面涂布氟橡胶或聚酰亚胺树脂,然后使之干燥后而得到的粘接片4。粘接片部4也可为不具有基材的薄膜。
热压用缓冲材料为层叠多层片状物而成的结构的情况下,可通过将缓冲部1与其它片状物层叠(例如将表层部(表层片)2、缓冲部(缓冲片)1、粘接片部4、缓冲部(缓冲片)1、表层部(表层片)2层叠),并通过热压使其一体化而制造。
本发明的热压用缓冲材料可在印刷基板等层叠板的制造中在进行加压成型或热压接时,与以往一样地在如图8所示的方法中使用。也即,通过以将本实施方式的热压用缓冲材料10***热盘13与被加压材料12之间的状态进行热压,由此可使施加于被加压材料12的热及压力在整个面均匀化。
实施例1
以下,示出制造实施例及比较例的缓冲材料并调查缓冲性而得的结果、以及进行灼烧减量试验的结果。需要说明的是,实施例1~2及比较例1~4为包含有表层片及粘接片的构成,比较例5不包含表层片及粘接片等而只由缓冲片构成。
(实施例1)
准备将四根玻璃纱(E玻璃纤维,单纤维直径6μm,单纤维总根数800根,支数67.5tex)合捻并进行膨松加工而得到的膨松纱三根,并准备将该三根膨松纱合捻而得到的膨松纱复合捻纱(单纤维总根数9600根)。准备将该膨松纱复合捻纱用于织布的纬纱而成的双重织膨体玻璃布作为织布材料。使氟橡胶浸渗于该玻璃布中而作为缓冲基材。准备两层该缓冲基材。另外,准备将氟橡胶涂布于平织玻璃布的两面而成的粘接片。进而,准备两层将聚酰亚胺树脂涂布于平织玻璃布的一面并将粘接用的氟橡胶涂布于相反面而得到的表层片。将这些材料以从上而下依次为表层片、缓冲基材、粘接片、缓冲基材、表层片的顺序层叠,通过进行热压使之一体化而得到热压用缓冲材料的样品。
(实施例2)
除了使用玻璃纱(E玻璃纤维,单纤维直径9μm,单纤维总根数400根,支数67.5tex)作为膨松纱复合捻纱(单纤维总根数4800根)之外,以与实施例1一样的方法制作出热压用缓冲材料,而得到样品。
(比较例1)
将四根与实施例1相同的玻璃纱合捻并进行膨松加工而得到的膨松纱(单纤维总根数3200根)用作织布的纬纱,得到双重织膨体玻璃布,准备该双重织膨体玻璃布作为织布材料。也即,使用的膨松纱不是膨松纱复合捻纱。使氟橡胶浸渗于该玻璃布中而作为缓冲基材。准备六层该缓冲基材。另外,准备五层与实施例1一样的粘接片。进而,准备两层与实施例1一样的表层片。将这些材料以从上而下依次为表层片、缓冲基材、粘接片、缓冲基材、粘接片、缓冲基材、粘接片、缓冲基材、粘接片、缓冲基材、粘接片、缓冲基材、表层片的顺序层叠,通过热压使其一体化而得到热压用缓冲材料的样品。
(比较例2)
将对玻璃纱(E玻璃纤维,单纤维直径9μm,单纤维总根数7800根,支数1390tex)进行膨松加工而得到的膨松纱用作为织布的纬纱,得到双重织膨体玻璃布,准备该双重织膨体玻璃布作为织布材料。也即,使用的膨松纱未进行合捻,进而也不是膨松纱复合捻纱。使用该双重织膨体玻璃布,得到与实施例1一样的构成的热压用缓冲材料的样品。
(比较例3)
准备四根将两根与实施例1相同的玻璃纱合捻而得到的纱,并准备对将该四根纱合捻而得到的纱(单纤维总根数6400根)进行膨松加工而得到的膨松纱。也即,并非将膨松纱合捻而成的膨松纱复合捻纱,而是对合捻的纱进行膨松加工而成为膨松纱。准备将该膨松纱用于织布的纬纱而得到的双重织膨体玻璃布作为织布材料。使用该双重织膨体玻璃布,得到与实施例1一样的构成的热压用缓冲材料的样品。
(比较例4)
使用单位面积重量为450g/m2的聚间亚苯基间苯二甲酰胺(polymetaphenyleneisophthalamide)制无纺布作为缓冲基材。使用三层缓冲基材、两层与实施例1中使用者相同的粘接片、两层与实施例1中使用者相同的表层片,以从上而下依次为表层片、缓冲基材、粘接片、缓冲基材、粘接片、缓冲基材、表层片的顺序层叠,通过热压而一体化,得到热压用缓冲材料的样品。
(比较例5)
将20张单位面积重量为190g/m2的牛皮纸重叠,而得到热压用缓冲材料的样品。
针对各种热压用缓冲材料按照下述的要领进行加压耐久性试验,并测定试验前后的厚度及缓冲性的变化。其结果示于表1中。
[加压耐久性试验条件]
加压力:40kgf/cm2
加压时间:75分钟
温度:230℃
加热时间:60分钟(在30分钟内从25℃升温到规定温度,保持该状态30分钟)
冷却时间:15分钟
样品尺寸:280mm见方
加压机:150t测试加压机(KANSAI ROLL Co.,Ltd.制)
(缓冲性的评价方法)
针对各种样品,分别评价其加压前、以及1次、10次、50次、100次及200次加压后的缓冲性。需要说明的是,比较例5的样品因为不是能够承受反复加压的热压用缓冲材料,因此只进行1次加压。对于各种样品进行下述的加压试验。并且,由以0.01kgf/cm2的加压力压缩时的厚度t1与以40kgf/cm2的加压力压缩时的厚度t2的差(μm)求出压缩缓冲性Fn。其结果示于表1中。图7为将表1绘制成曲线图而成者。
加压力:40kgf/cm2
温度:230℃
预热:以0.05kgf/cm2的加压条件进行2分钟
加压速度:1mm/min
样品尺寸:25mmφ
样品采取位置:从耐久性试验用样品的距离端缘5cm以上的位置选取一处
试验装置:Instron万能材料试验机5565型(Instron Japan Co.,Ltd.制)
需要说明的是,将Fn值400以上的样品评价为缓冲性良好,将10次加压后的Fn值仍在400以上的样品评价为耐久性良好。
[表1]
另外,针对各种热压用缓冲材料进行灼烧减量试验,测定试验后的灼烧减量。其结果也一并示于表1中。需要说明的是,灼烧减量试验针对使用织布的实施例1~2及比较例1~3而进行。
如表1所示,满足本发明的条件的实施例1、2中,在任意加压次数下都具有Fn在400以上的良好的缓冲性。另一方面,比较例1中,虽然即使实施多次加压后缓冲性也不易降低而在耐久性方面优异,但缓冲性本身为低的结果。比较例5则是缓冲性及耐久性都低的结果。此外,至于比较例2~5,虽然初期的缓冲性高,但在一次的试验后缓冲性就极端降低,在10次加压后,为Fn低于400的结果,得不到在重复使用时稳定的缓冲性。
另外,从表1可知,满足本发明的条件的实施例1、2中,灼烧减量为5质量%~30质量%。
产业上的可利用性
根据本发明,可提供即使在反复使用的情况下也能够维持良好的缓冲性的热压用缓冲材料。
附图标记说明
1:缓冲部
1a:玻璃纤维纱
1b:膨松纱
1c:膨松纱复合捻纱
2:表层部
3:粘接层部
4:粘接片部
5:织布
5a:经纱
5b:纬纱
6:聚合物材料
7:空隙
10:热压用缓冲材料
11:缓冲材料
12:被加压材料
13:热盘
14:镜面板
Claims (5)
1.一种热压用缓冲材料,其具有缓冲部,
所述缓冲部包含:
经纱或纬纱中的至少一者采用了合捻纱的织布;以及
附着于构成所述织布的纤维的表面的聚合物材料,
所述合捻纱是将由玻璃纤维构成的多根膨松纱合捻而形成的。
2.根据权利要求1所述的热压用缓冲材料,其中,所述玻璃纤维的单纤维的直径为3~11μm。
3.根据权利要求1或2所述的热压用缓冲材料,其中,构成所述合捻纱的单纤维的总根数为3000根~100000根。
4.根据权利要求1~3中任一项所述的热压用缓冲材料,其中,将以230℃、0.01kgf/cm2的条件压缩所述热压用缓冲材料时的厚度表示为t1、将以230℃、40kgf/cm2的条件压缩所述热压用缓冲材料时的厚度表示为t2时,由下述(1)式求出的Fn为400以上,
Fn=(t1-t2)×1000/t2...(1)。
5.根据权利要求1~4中任一项所述的热压用缓冲材料,其中,从所述热压用缓冲材料取出的附着有所述聚合物材料的所述合捻纱的灼烧减量为5~30%。
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