CN1302179A - 使用粘结膜的多层印刷电路板的制造方法 - Google Patents
使用粘结膜的多层印刷电路板的制造方法 Download PDFInfo
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- CN1302179A CN1302179A CN00133154A CN00133154A CN1302179A CN 1302179 A CN1302179 A CN 1302179A CN 00133154 A CN00133154 A CN 00133154A CN 00133154 A CN00133154 A CN 00133154A CN 1302179 A CN1302179 A CN 1302179A
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Abstract
本发明是使用粘结膜制造良品率高、制造简便并且表面平滑性好的多层印刷电路板的方法。目的在于开发以交替堆积导体电路层和绝缘层的沉积方式简便的制造良品率高的多层印刷电路板的方法。其构成是在使用带有脱模层的支撑基膜和在该脱模层表面上叠层的具有与该表面相同或比该表面小的面积的热流动性、常温固态形状的树脂组合物构成的粘结膜,来制造多层印刷电路板。另外,还利用导电性糊膏进行层间连接,来制造多层电路板。
Description
本发明涉及在交替堆积导体电路层和绝缘层的沉积方式的多层印刷电路板的制造方法中,使用粘结膜,致使良品率提高、制造简单并且表面平滑性好的多层印刷电路板的制造方法。
近年来,在内层电路板的导体层上交替地堆积有机绝缘层的沉积方式的多层印刷电路板的制造技术引人注目。其中,因激光加工技术的发展,广泛采用这样的制造多层印刷电路板的方法,即在内层电路基板上附有热固化性树脂的铜箔,用热固化性树脂覆盖并加热固化,利用激光器和/或钻孔器进行开孔后,通过镀敷形成导体层。本发明人等还在特开平11-87927号公报中披露了电路通孔填孔性在使用有热流动性的树脂组合物的内层电路图形的覆盖性上良好的粘结膜,和使用该粘结膜的同样的多层印刷电路板的制造方法。尽管特开平11-69995号公报披露了在把热固化性树脂进行热固化以前的工艺步骤中,在电路基板上按大约80℃×5秒来真空叠层支撑在支撑基膜上的该树脂组合物层的方法,但却未谈及其后的热固化该树脂组合物的工艺步骤。在电路基板上真空叠层树脂组合物层之后,在剥离支撑基膜后固化该树脂组合物的情况下,在树脂的热固化中附着异物,存在引起以后的断线、短路等不良的问题,以及如图1所示,由于这种工艺方法的沉积基板在通路和/或通孔上不能形成电路和通路,存在设计自由度低,难以使用自动配置布线工具从而在电路设计上具有花费时间的缺点。作为消除这些缺点的方法,众所周知用填孔油墨和导电性糊膏来填充通路和/或通孔的工艺方法。因此如果用图2来说明以往的沉积基板的表面平滑化工艺方法,那么首先在内层电路基板的图形上涂敷或叠层热固化性树脂后,进行热固化。接着,利用激光器和/或钻孔器进行开孔。然后,用碱性氧化剂等粗化处理树脂表面,通过镀敷来形成导体层。在使用带有热固化性树脂的铜箔的情况下,通过镀敷进行孔内的导体连接,形成相同的结构。然后,用丝网印刷在孔内部填充填孔油墨和导电性糊膏,并进行热固化。接着,进行表面研磨,而且,通过再次镀敷来形成导体层,在通路和通孔上可形成电路。在这种以往的方法中,对每个通路和/或通孔的图形都必须高精度地制造填孔用的丝网印刷版,还必须进行表面研磨除去印刷后在表面附近溢出的填孔油墨和导电性糊膏那样的工艺步骤,存在工艺步骤长并复杂的问题。
本发明开发了一种多层印刷电路板的制造方法,该方法是在把带有支撑基膜的粘结膜的树脂组合物层高良品率地热固化在电路板上时,特别是可排除热固化的树脂组合物表面上的异物混入,并且简便地制造表面平滑性良好的多层印刷电路板。
本发明人等发现,通过使热固化性树脂组合物直接接触外部空气直至热固化,就可解决问题,并消除异物附着于固化中的树脂的缺点。就是说,本发明是使用带有脱模层的支撑基膜和在该脱模层表面上叠层的具有与该表面相同或比该表面小的面积的热流动性、常温固态形状的热固性树脂组合物构成的粘结膜,来制造多层印刷电路板的方法,该多层电路板的制造方法包括以下的必须工艺步骤:
1)在图形加工过的电路板的单面或双面上的至少该图形加工部分上,在直接覆盖重叠粘结膜的树脂组合物层的状态下,并在真空条件下进行加热、加压并进行叠层的工艺步骤;
2)在带有支撑基膜的状态下热固化该树脂组合物的工艺步骤;另外,
3)在至少剥离支撑基膜后,利用激光器和/或钻孔器进行开孔的工艺步骤,或在利用激光器和/或钻孔器开孔后,至少剥离支撑基膜,露出树脂组合物层的工艺步骤;
4)对该树脂组合物表面进行粗化处理的工艺步骤;
5)在该粗化表面上进行镀敷,形成导体层的工艺步骤;
此外,在利用导电性糊膏来进行层间连接的情况下,是使用具有脱模层的支撑基膜和与该脱模层表面叠层、并具有与该表面相同或比该表面小的面积的热流动性、常温固态的热固性树脂组合物构成的粘接膜来制造多层印刷电路板的方法,该多层电路板的制造方法包括以下的必须工艺步骤:
1)在图形加工过的电路基板的单面或双面上的至少该图形加工部分上,在直接覆盖重叠粘结膜的树脂组合物层的状态下,并在真空条件下进行加热、加压并进行叠层的工艺步骤;
2)在热固化该树脂组合物后,利用激光器和/或钻孔器进行开孔的工艺步骤;
3)在孔内填充导电性糊膏的工艺步骤;
4)至少在支撑基膜剥离后,进行热固化导电性糊膏的工艺步骤;或在热固化导电性糊膏后,进行至少剥离支撑基膜,露出树脂组合物层的工艺步骤;
5)对该树脂组合物表面进行粗化处理的工艺步骤;
6)接着在该粗化表面上进行镀敷,形成导体层的工艺步骤。
图1是以往的沉积基板剖面图。
图2是从上到下依次表示以往的平滑化工艺步骤。
图3是从上到下依次说明包括通过本发明的支撑基膜剥离产生的平滑化和随后的镀敷层及电路形成的多层印刷电路板的制造方法的流程。
作为本发明的常温固态的热固化性树脂组合物,没有特别限定,只要是以热固化性树脂和/或高分子为主要构成成分,并通过加热进行软化,并且是有薄膜形成效能的树脂组合物,而且,通过热固化可满足耐热性、电特性等层间绝缘材料所要求的特性的物质就可以。例如,可列举出环氧树脂系、丙烯酸树脂系、聚酰胺树脂系、聚酰胺酰亚胺树脂系、聚氰酸酯树脂系、聚酯树脂系、热固化型聚苯醚树脂系等,也可以把它们组合两种以上来使用,也可以形成具有多层结构的粘结膜。其中,作为层间绝缘材料,就可靠性和成本性良好的环氧树脂系来说,可列举特开平11-87927号公报技露的环氧树脂组合物。
可以采用以带有脱模层基膜作为支撑体,在把溶解在预定有机溶剂中的树脂透明涂料涂敷在脱模层上后,通过加热和/或喷吹热风来使溶剂干燥作成常温固态形状的热固化性树脂组合物的众所周知的方法来制作粘结膜。作为支撑基膜,可列举出聚乙烯、聚氯乙烯等聚烯烃、聚对苯二甲酸乙二醇酯等聚酯、聚碳酸酯、以及脱模纸和铜箔、铝箔那样的金属箔等。作为支撑基膜的厚度,一般为10~100μm。作为脱模层,可以使用与树脂透明涂料一致的众所周知的(聚)硅氧烷系、非(聚)硅氧烷系,而厚度一般在3μm以下。常温固态的热固化性树脂组合物的厚度在叠层的内层电路板的导体厚度以上,一般在导体厚度+(10~120)μm的范围内。常温固态的热固化性树脂组合物和支撑基膜构成的本发明的粘结膜原封不动的或在树脂组合物的另一面上还叠层脱模保护膜,通过卷成筒状来储存。
下面,使用图3具体地说明本发明的工艺步骤。首先,在图形加工完的电路基板上的单面或双面上的至少该图形加工部分,在直接覆盖重叠粘结膜的树脂组合物层的状态下,在真空条件下进行加热、加压进行叠层中,使用ニチゴ-·モ-トン(株)制真空敷帖器、(株)名机制作所制真空加压式叠层器、日立テクノエンジニァリンゲ(株)制真空滚轮式干涂料器等市场销售的真空叠层机。在上述粘结膜上存在保护膜的情况下,在除去保护膜后,在真空条件下,从支撑基膜侧一边加压、加热一边粘贴树脂组合物层。由于叠层时的树脂流动是在内层电路的导体厚度以上的条件下进行叠层的,所以可良好地进行内层电路图形的覆盖。具体地说,根据需要预热薄膜和内层电路板,压接温度为70~130℃,压接压力为1~11kgf/cm2,在10毫巴以下的减压下进行叠层也可以。叠层可以是分批式,也可以是滚轮的连续式。
接着,在带有支撑基膜的状态下热固化该树脂组合物。由此,在固化中的树脂表面上没有尘土和异物附着的情况,即消除了以往的异物附着问题,也不需要清洁炉等昂贵的设备。然后,在带有支撑基膜下,或在没有支撑基膜下,利用激光器或钻孔器来进行开孔。热固化的条件因树脂而有所不同,但可在100~200℃下10~90分钟的范围内选择。其中,从略微的低温向高温的分步硫化从加工质量方面看较好。为了在后面的开孔工艺步骤中孔形状的均匀性和导电性糊膏使用的情况下,对糊膏中含有的有机溶剂等的耐受性,热固化是必须的。就开孔来说,使用市场销售的二氧化碳气体、UV-YAG、受激准分子等激光器开孔机和/或钻孔机,按众所周知的方法在规定的位置上进行开孔。优选在开孔后通过喷射擦洗那样的机械处理和软腐蚀等化学处理来洗净孔内部。本发明的粘结膜通过在支撑基膜上带有脱模层,故在热固化性树脂组合物的热固化后可以容易地剥离。
在本发明方案1和3的工艺步骤中,在上述工艺步骤后,按照特开平11-87927号公报披露的以往工艺方法和与图2相同的工艺步骤来制造多层印刷电路板。另一方面,在使用导电性糊膏进行层间连接的本发明的第二工艺步骤中,在孔内填充导电性糊膏。作为导电性糊膏,除了市场销售的银糊膏、铜糊膏等金属粉糊膏外,可以使用含有导电性粒子的糊膏等。就填充来说,在目前市场销售的导电性糊膏的特性上,丝网印刷是一般的特性,但并不限于此。在内层电路基板两面上必须印刷的情况下,可选择两面同时印刷或单面印刷后进行热固化,并对里面进行印刷的方法。在印刷中,由于树脂组合物层和同时开孔的支撑基膜起到高精度接触掩模的作用,所以具有对孔部分以外的树脂组合物表面完全没有导电性糊膏的附着的良好特征。由此,利用以往难以使用的导电性糊膏就可进行有选择的电连接。此外,由于对小直径通路的埋入性的提高,在印刷后进入减压处理工艺步骤也可以。
接着,在支撑基膜剥离后热固化导电性糊膏的工艺步骤,或在热固化导电性糊膏之后,支撑基膜剥离,以使树脂组合物层露出。通过在支撑基膜上带有脱模层,所以本发明的粘结膜在热固化性树脂组合物和/或导电性糊膏的热固化后可以很容易地剥离。热固化的条件因树脂和导电性糊膏有所不同,可在100~200℃下10~90分钟的范围内选择。然后,在以往的工艺方法中,在对孔内部填充填孔油墨或导电性糊膏时,必须有研磨除去孔表面附近溢出部分的工艺步骤,但在本发明的工艺方法中,如上所述,由于没有对孔部分以外的树脂组合物表面的导电性糊膏的附着,所以可以省略研磨工艺步骤。剥离支撑基膜时脱模层也同时被剥离,但根据情况,有剥离层的一部分残留在树脂组合物层上的情况。即使该情况下,用以下的粗化工艺步骤,也可以除去附着的剥离层。
然后,粗化处理该树脂组合物表面,接着,在其上层上通过镀敷形成导体层。作为粗化方法,除了高锰酸盐、重铬酸盐、臭氧、过氧化氢/硫酸、硝酸等的氧化剂的化学药品处理外,还可列举抛光轮、喷沙器等的机械研磨和等离子体腐蚀等。在这样的树脂组合物表面上形成凹凸的锚位后,通过无电解、电解镀敷等镀敷来形成导体层。然后,按照众所周知的减层法和半加层法,即使在通路和通孔上也可以不受制约地形成电路。此外,形成与粗化处理后导体层相反图形的镀敷抗蚀剂,仅用无电解镀敷来形成导体层电路也可以。通过把以上的工艺步骤作为必要的工艺步骤的加工方法,可不需要表面研磨并除去以往方法中必须的通路和/或通孔的每个图形的填孔所用的丝网印刷版、以及在印刷后表面附近发现的填孔油墨和导电性糊膏的那些工艺步骤,从而可以缩短工艺步骤、减少成本。
【实施例】
示出以下实施例来具体地说明本发明,但本发明并不限于此。
【粘结膜制造例】在甲基-乙基甲酮中一边搅拌一边加热溶解液状双酚A型环氧树脂(油化壳环氧(シェルエポキシ)(株)制‘埃比科特环氧树脂(エピコ-ト)828EL’[商品名])20份、溴化双酚A型环氧树脂(东都化成(株)制‘YDB-500’)20份、甲酚酚醛清漆型环氧树脂(大日本油墨(インキ)化学(株)制‘埃比克劳恩(エピクロン)N-673[商品名])20份、末端环氧化聚丁二烯橡胶(ナガセ化成工业(株)制‘テナレックスR-45EPT’)15份,然后添加溴化苯氧树脂透明涂料(不挥发部分40wt%,东都化成(株)制‘YPB-40-PXM40’)50份、作为环氧固化剂的2,4-二氨基-6-(2-甲基-1-咪唑啉乙基)-1,3,5-三嗪·异氰脲酸加成物4份、以及微粉碎二氧化硅2份、三氧化锑4份、碳酸钙5份,制作树脂组合物透明涂料。在25μm厚度的带聚硅氧烷脱模层的聚对苯二甲酸乙二醇酯薄膜(东洋メタライシンゲ(株)制 セラピ-ルBK’)上,用模压涂料器以使干燥后的树脂厚度达到70μm地涂敷该透明涂料,并在80~120℃中进行干燥,获得粘结膜。
【实施例1】
1)在图形加工过的510×340mm的玻璃环氧树脂的双面电路板上(板厚度0.4mm,导体厚度35μm),使制造例1得到的粘结膜为507×336mm的尺寸,将树脂侧作成图形面,并单张贴在基板两面上。接着,利用モ-トン·インタ-ナショナル·イン コ-ポレティド制真空涂抹器725,在真空度1毫巴、温度80℃、15秒模压下两面同时进行叠层。
2)在100℃下进行30分钟热固化,然后在170℃下再进行30分钟热固化。
3)在支撑基膜剥离后,利用市场销售的二氧化碳激光器和钻孔机在规定的位置上进行开孔。剥离可非常轻松容易地进行,在树脂表面上未发现异物附着等缺陷。
4)用高锰酸盐的碱性氧化剂粗化处理树脂组合物表面,
5)进行无电解和电解铜镀敷,按照减层法获得四层印刷电路板。
【实施例2】
1)在图形加工过的510×340mm的玻璃环氧树脂的双面电路板上(板厚度0.4mm,导体厚度35μm),使制造例1得到的粘结膜为507×336mm的尺寸,将树脂侧作成图形面,并单张贴在基板两面上。接着,利用モ-トン·インタ-ナショナル·イン コ-ポレティド制真空涂抹器725,在真空度1毫巴、温度80℃、15秒模压下两面同时进行叠层。
2)在130℃下进行30分钟热固化后,利用市场销售的二氧化碳激光器和钻孔机在规定的位置上进行开孔。激光通路路径为150μm,通孔孔径为200μm。然后,通过喷射擦洗处理来洗净孔内部。
3)在激光通路和通孔内,通过丝网印刷来填充市场销售的银糊膏。印刷是在单面印刷后在130℃下进行10分钟热固化,然后再对里面进行同样的印刷。
4)在170℃进行30分钟热固化后,剥离支撑基膜。剥离可非常轻松容易地进行。
5)用高锰酸盐的碱性氧化剂粗化处理树脂组合物表面,
6)进行无电解和电解铜镀敷,按照减层法获得四层印刷电路板。
【实施例3】
1)在图形加工过的510×340mm的玻璃环氧树脂的双面电路板上(板厚度0.8mm,导体厚度35μm),使制造例1得到的粘结膜为507×336mm的尺寸,将树脂侧作成图形面,并单张贴在基板两面上。接着,利用(株)名机制作所制真空模压机‘MVLP’,在真空度1毫巴、温度80℃、压力5kg、15秒模压下两面同时进行叠层。
2)在130℃下进行30分钟热固化后,利用市场销售的二氧化碳激光开孔机在规定的位置上进行激光通路路径150μm的开孔。
3)在激光通路内,通过丝网印刷来填充市场销售的铜糊膏。印刷是在单面印刷后,在130℃下进行10分钟热固化,然后对里面再进行同样的印刷。
4)在支撑基膜剥离后,在170℃中进行60分钟热固化。
5)用高锰酸盐的碱性氧化剂粗化处理树脂组合物表面,
6)然后形成与该导体层相反图形的镀敷抗蚀剂,仅按无电解镀敷来形成导体电路层,获得四层印刷电路板。
从实施例1的结果可见,如果按照本发明的方法使用粘结膜,可以简便地进行清洁的绝缘层的形成。另外,再从实施例2、3的结果可见,采用实施例2、3可省略以往必要的通路和/或通孔的每个图形的孔埋入使用的丝网印刷版和表面研磨工艺步骤,可以按简便的沉积法来制造表面平滑性好的多层印刷电路板。
按照本发明的方法,使用粘结膜,按良品率高、简便的沉积方法就可以制造多层印刷电路板。
Claims (3)
1.一种多层印刷电路板的制造方法,该方法是使用带有脱模层的支撑基膜和在该脱模层表面上叠层的具有与该表面相同或比该表面小的面积的热流动性、常温固态形状的树脂组合物构成的粘结膜,来制造多层印刷电路板的方法,该方法包括以下的必须工艺步骤:
(1)在图形加工过的电路板的单面或双面上的至少该图形加工部分上,在直接覆盖重叠粘结膜的树脂组合物层的状态下,并在真空条件下进行加热、加压并进行叠层的工艺步骤;
(2)在带有支撑基膜的状态下热固化该树脂组合物的工艺步骤;
(3)在至少剥离支撑基膜后,利用激光器和/或钻孔器进行开孔的工艺步骤,或在利用激光器和/或钻孔器开孔后,至少剥离支撑基膜,使树脂组合物层露出的工艺步骤;
(4)对该树脂组合物表面进行粗化处理的工艺步骤;和
(5)接着在该粗化表面上进行镀敷,形成导体层的工艺步骤。
2.一种多层印刷电路板的制造方法,该方法是使用带有脱模层的支撑基膜和在该脱模层表面上叠层的具有与该表面相同或比该表面小的面积的热流动性、常温固态形状的树脂组合物构成的粘结膜,来制造多层印刷电路板的方法,该方法包括以下的必须工艺步骤:
(1)在图形加工过的电路板的单面或双面上的至少该图形加工部分上,在直接覆盖重叠粘结膜的树脂组合物层的状态下,并在真空条件下进行加热、加压并进行叠层的工艺步骤;
(2)在使该树脂组合物热固化后,利用激光器和/或钻孔器进行开孔的工艺步骤;
(3)在孔内填充导电性糊膏的工艺步骤;
(4)至少在支撑基膜剥离后,进行热固化导电性糊膏的工艺步骤;或在热固化导电性糊膏后,进行至少剥离支撑基膜,露出树脂组合物层的工艺步骤;
(5)对该树脂组合物表面进行粗化处理的工艺步骤;和
(6)接着在该粗化表面上进行镀敷,形成导体层的工艺步骤。
3.一种多层印刷电路板的制造方法,该方法是使用带有脱模层的支撑基膜和在该脱模层表面上叠层的具有与该表面相同或比该表面小的面积的热流动性、常温固态形状的树脂组合物构成的粘结膜,来制造多层印刷电路板的方法,其中以,
(1)在图形加工过的电路板的单面或双面上的至少该图形加工部分上,在直接覆盖重叠粘结膜的树脂组合物层的状态下,并在真空条件下进行加热、加压并进行叠层的工艺步骤;
(2)在带有支撑基膜的状态下热固化该树脂组合物的工艺步骤作为必要的步骤形成绝缘层。
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JP2000205132A JP4300687B2 (ja) | 1999-10-28 | 2000-07-06 | 接着フィルムを用いた多層プリント配線板の製造法 |
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US (1) | US6739040B1 (zh) |
EP (1) | EP1096842A3 (zh) |
JP (1) | JP4300687B2 (zh) |
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- 2000-10-23 TW TW089122262A patent/TW507510B/zh not_active IP Right Cessation
- 2000-10-23 KR KR1020000062262A patent/KR20010051189A/ko not_active Application Discontinuation
- 2000-10-25 CN CN00133154A patent/CN1302179A/zh active Pending
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CN102104007B (zh) * | 2009-12-21 | 2013-04-17 | 北大方正集团有限公司 | 一种特种电路板的制造方法和设备 |
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CN104290387A (zh) * | 2013-07-16 | 2015-01-21 | 昆山雅森电子材料科技有限公司 | 天线板专用彩色化油墨保护膜及其制作方法 |
CN104290387B (zh) * | 2013-07-16 | 2016-02-24 | 昆山雅森电子材料科技有限公司 | 天线板专用彩色化油墨保护膜及其制作方法 |
Also Published As
Publication number | Publication date |
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TW507510B (en) | 2002-10-21 |
JP2001196743A (ja) | 2001-07-19 |
US6739040B1 (en) | 2004-05-25 |
EP1096842A2 (en) | 2001-05-02 |
EP1096842A3 (en) | 2003-06-18 |
KR20010051189A (ko) | 2001-06-25 |
JP4300687B2 (ja) | 2009-07-22 |
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