JPH10168784A - Base paper for electric insulating laminated board - Google Patents
Base paper for electric insulating laminated boardInfo
- Publication number
- JPH10168784A JPH10168784A JP33681896A JP33681896A JPH10168784A JP H10168784 A JPH10168784 A JP H10168784A JP 33681896 A JP33681896 A JP 33681896A JP 33681896 A JP33681896 A JP 33681896A JP H10168784 A JPH10168784 A JP H10168784A
- Authority
- JP
- Japan
- Prior art keywords
- base paper
- wollastonite
- laminate
- laminated board
- dimensional stability
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
Landscapes
- Paper (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、プリント配線板等
の材料である電気絶縁積層板用原紙に関するものであ
り、特に寸法安定性に優れた積層板を製造するのに用い
られる積層板原紙に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base paper for an electrically insulating laminate which is a material for printed wiring boards and the like, and more particularly to a base paper for a laminate used for producing a laminate having excellent dimensional stability. .
【０００２】[0002]
【従来の技術】通常の電気絶縁積層板は、紙にフェノー
ル樹脂、エポキシ樹脂等の熱硬化性樹脂を含浸し、これ
を加熱乾燥して半硬化樹脂のプリプレグにし、このプリ
プレグを複数枚積層し、金属箔と共に熱圧成型すること
により製造される。このようにして得られた積層板は、
通常の電気或いは電子機器に使用するための性能をほぼ
満足しているため民生用電気製品を中心に多く使用され
ている。しかしながら、近年の電気製品の軽薄短小化に
より、電気部品の実装密度が高くなり、プリント配線板
の導体パターンの細線化が進んでいる。また、電気製品
の低価格指向、産業用機器への家電メーカーの参入に伴
い、従来は不可能とされていた分野への紙基材積層板の
使用が広がっている。このため、積層板の加工性、電気
特性は勿論のこと、寸法安定性の改良要求が益々厳しく
なって来ている。紙基材積層板の寸法安定性としては、
特に加熱処理に対する平面方向の寸法安定性が要求さ
れ、加熱時の膨張、加熱冷却による収縮（加熱前の寸法
よりも収縮する）が小さいことが望まれる。プリント基
板の加工工程、例えばパンチング工程では基板をある程
度加熱して軟化させて行う。従って、熱による膨張が大
きいと打ち抜き後の収縮が大きくなり、不都合が生じ
る。2. Description of the Related Art Ordinary electrical insulation laminates are prepared by impregnating paper with a thermosetting resin such as a phenol resin or an epoxy resin, heating and drying the prepreg to form a semi-cured resin prepreg, and laminating a plurality of the prepregs. It is manufactured by hot pressing with a metal foil. The laminate thus obtained is
Since it almost satisfies the performance for use in ordinary electric or electronic equipment, it is widely used mainly for consumer electric products. However, due to the recent trend toward smaller and lighter electrical products, the mounting density of electrical components has increased, and the conductor patterns of printed wiring boards have become thinner. In addition, with the trend toward lower prices for electric products and the entry of home appliance manufacturers into industrial equipment, the use of paper base laminates in fields that were previously impossible has been widespread. For this reason, the demands for improving the dimensional stability as well as the workability and electrical characteristics of the laminate have become more and more severe. As the dimensional stability of paper base laminates,
In particular, dimensional stability in a planar direction with respect to heat treatment is required, and it is desired that expansion during heating and shrinkage due to heating / cooling (shrinkage from dimensions before heating) be small. In a processing step of a printed board, for example, a punching step, the board is heated and softened to some extent. Therefore, if the expansion due to heat is large, the contraction after punching becomes large, which causes inconvenience.
【０００３】積層板の寸法安定性を改良するために、原
紙に要求される特性としては、特に原紙を構成するパル
プ繊維の形状が重要であり、真っ直ぐで厚壁な繊維を使
用するのが良いことが知られている（特開平６−１３６
６８７号公報、特開平３−１４６７９４号公報等）。こ
のようなパルプ繊維を用いることにより、寸法安定性の
改良が行われてきたが、なお高品質を求められているの
が現状であり、さらなる改良が要求されている。[0003] In order to improve the dimensional stability of the laminated board, the characteristics required for the base paper are particularly important in the shape of the pulp fibers constituting the base paper, and it is preferable to use straight and thick-walled fibers. (Japanese Unexamined Patent Publication No. 6-136)
687, JP-A-3-146794, etc.). Although the dimensional stability has been improved by using such pulp fibers, high quality is still required at present, and further improvement is required.
【０００４】[0004]
【発明が解決しようとする課題】本発明者等は、かかる
現状に鑑み積層板の寸法安定性を向上させるために種々
検討した結果、木材パルプと特定のウォラストナイトを
混抄した原紙を用いると、積層板の寸法安定性が飛躍的
に向上することを見出し、本発明を完成させるに至っ
た。本発明の目的は、寸法安定性が良好な積層板を製造
するのに用いられる積層板原紙を提供することにある。In view of the above situation, the present inventors have made various investigations to improve the dimensional stability of a laminated board. As a result, it has been found that a base paper obtained by mixing wood pulp and a specific wollastonite is used. The inventors have found that the dimensional stability of the laminated plate is dramatically improved, and have completed the present invention. An object of the present invention is to provide a laminate base paper used for producing a laminate having good dimensional stability.
【０００５】[0005]
【課題を解決するための手段】本発明は以下の態様を含
む。 〔１〕 ウォラストナイトを含有するパルプシートであ
る電気絶縁積層板原紙。 〔２〕 ウォラストナイトのアスペクト比が１０以上で
ある〔１〕記載の電気絶縁積層板原紙。 〔３〕 〔１〕または〔２〕記載の積層板原紙に熱硬化
性樹脂を含浸させたプリプレグを少なくとも１枚以上使
用して得られる電気絶縁積層板。The present invention includes the following aspects. [1] A base paper for an electrically insulated laminate, which is a pulp sheet containing wollastonite. [2] The base paper for electrically insulating laminate according to [1], wherein the aspect ratio of wollastonite is 10 or more. [3] An electrically insulated laminate obtained by using at least one prepreg obtained by impregnating a thermosetting resin into the laminate base paper according to [1] or [2].
【０００６】[0006]
【発明の実施の形態】本発明の積層板原紙は、ウォラス
トナイトを含有させることにより積層板としたときの寸
法安定性が向上する。この理由は明らかでないが、弾性
率が高く熱膨張係数の小さいウォラストナイトが、特に
その軸方向において、樹脂の伸縮を効果的に抑制するた
めと推定される。ウォラストナイトとは天然に産出する
或いは人工の白色の繊維状または塊状のカルシウムを含
む珪酸塩で、ＣａＳｉＯ3 またはＣａＯ・ＳｉＯ2の化
学式で表される。ウォラストナイトには、産地によりα
型とβ型の２種類があるが、α型は粒状や粉状が多く、
β型は針状や長柱状が多い。粉砕方法により異なるため
一概には言えないが、一般的にα型はアスペクト比が５
程度、β型はアスペクト比２０程度である。BEST MODE FOR CARRYING OUT THE INVENTION The stencil base paper of the present invention contains wollastonite to improve dimensional stability when formed into a slab. Although the reason is not clear, it is presumed that wollastonite having a high elastic modulus and a small thermal expansion coefficient effectively suppresses expansion and contraction of the resin, particularly in the axial direction. Wollastonite is a naturally occurring or artificial white fibrous or massive calcium-containing silicate represented by the chemical formula of CaSiO 3 or CaO.SiO 2 . For wollastonite, α
There are two types, a type and a β type.
β-type has many needles and long columns. Although it cannot be said unconditionally because it differs depending on the pulverization method, generally the α type has an aspect ratio of 5
The β-type has an aspect ratio of about 20.
【０００７】本発明に使用されるウォラストナイトは、
そのアスペクト比（長径と短径の比）が１０以上が好ま
しい。因みに、アスペクト比が大きいと積層板としたと
きの寸法安定性向上効果が特に優れる。尚、理由は定か
ではないが、アスペクト比の小さいものは平面方向への
配向度が小さいため、基材中の平面方向に配向する成分
（パルプ繊維を含む）が減少するため、アスペクト比の
大きいものほどの効果が得られないものと推定される。
アスペクト比には特に上限はないが、３０程度まで十分
な効果が得られる。ウォラストナイトの長径も特に限定
しないが、例えば３０μｍ〜５００μｍ程度が例示でき
る。The wollastonite used in the present invention is:
The aspect ratio (the ratio of the major axis to the minor axis) is preferably 10 or more. Incidentally, when the aspect ratio is large, the effect of improving the dimensional stability when the laminate is formed is particularly excellent. Although the reason is not clear, those having a small aspect ratio have a small degree of orientation in the plane direction, and the components (including pulp fibers) oriented in the plane direction in the base material are reduced. It is presumed that the effect is not so high.
Although there is no particular upper limit on the aspect ratio, a sufficient effect up to about 30 can be obtained. The major axis of wollastonite is not particularly limited, but may be, for example, about 30 μm to 500 μm.
【０００８】本発明の積層板原紙におけるウォラストナ
イトの含有率は、特に限定するものではないが、原紙の
シート強度、積層板とした時の寸法安定性等を考慮する
ならば５〜１５重量％程度が好ましい。因みに、含有率
が低すぎると寸法安定性の向上効果が十分でない場合も
あり、含有率が高すぎるとシート強度が低下する恐れが
ある。なお、シート強度の低下を補うために紙力増強
剤、湿潤紙力増強剤等を添加することももちろん可能で
あるが、積層板の品質を損じることのないように、種
類、添加量等を慎重に選択する必要がある。さらに、ウ
ォラストナイトと熱硬化性樹脂の親和性を向上させる目
的で、カップリング剤によりあらかじめウォラストナイ
トに表面処理を施しておく、あるいは含浸する樹脂にカ
ップリング剤を混入させることも可能である。ウォラス
トナイトを原紙に含有させる方法としては、抄紙原料に
含有させる方法が例示できる。抄紙原料への添加方法と
しては、パルプスラリーに直接ウォラストナイトを投入
する、あるいはあらかじめ水に分散したウォラストナイ
トを添加する方法があるが、ウォラストナイトは比重が
大きく、沈降しやすいため配管詰まり等の恐れがあり、
前者の方法が好ましい。[0008] The content of wollastonite in the laminated base paper of the present invention is not particularly limited. However, if the sheet strength of the base paper and the dimensional stability of the laminated board are taken into consideration, the content is 5 to 15 wt. % Is preferable. Incidentally, if the content is too low, the effect of improving the dimensional stability may not be sufficient, and if the content is too high, the sheet strength may be reduced. It is of course possible to add a paper strength enhancer, a wet paper strength enhancer, etc. in order to compensate for the decrease in sheet strength.However, the type, amount, etc. should be adjusted so as not to impair the quality of the laminate. You need to choose carefully. Furthermore, in order to improve the affinity between wollastonite and the thermosetting resin, it is possible to apply a surface treatment to wollastonite in advance with a coupling agent, or to mix the coupling agent with the resin to be impregnated. is there. Examples of a method of incorporating wollastonite into base paper include a method of including wollastonite in a papermaking raw material. As a method of adding wollastonite to papermaking raw materials, there is a method of directly adding wollastonite to pulp slurry or adding wollastonite dispersed in water in advance.However, wollastonite has a large specific gravity and is easy to settle. There is a risk of clogging,
The former method is preferred.
【０００９】本発明に使用されるウォラストナイト以外
の製紙用原料としては、特に限定されるものでなく、木
材チップより得られるクラフトパルプ，亜硫酸パルプ，
機械パルプ，溶解パルプ、リンター，麻，タケ等の非木
材パルプ等が使用でき、好ましくは広葉樹からのクラフ
トパルプが用いられる。本発明の積層板原紙から積層板
を製造するため、この積層板原紙に熱硬化性樹脂を含浸
して乾燥し、このようにして得られたプリプレグの２枚
以上を積層し、所定温度および圧力により成型一体化す
ることが行われる。熱硬化性樹脂としては、一般に、レ
ゾール型フェノール−ホルムアルデヒド樹脂が用いられ
るが、これに限定されることなく、その他の、例えば、
通常のフェノール−ホルムアルデヒド樹脂、メラミン−
ホルムアルデヒド樹脂、尿素−ホルムアルデヒド樹脂等
を挙げることができ、適宜選択して使用される。熱硬化
される際の加熱と加圧操作の条件は、熱硬化性樹脂の種
類や量および積層体の構成、寸法等により変化するが、
一般に１５０〜１８０℃の温度、８０〜１２０ｋｇ／ｃ
ｍ2 の圧力で３０〜６０分間行われる。The raw materials for papermaking other than wollastonite used in the present invention are not particularly limited, and kraft pulp obtained from wood chips, sulphite pulp,
Non-wood pulp such as mechanical pulp, dissolved pulp, linter, hemp and bamboo can be used, and preferably kraft pulp from hardwood is used. In order to manufacture a laminate from the laminate base paper of the present invention, the laminate base paper is impregnated with a thermosetting resin and dried, and two or more prepregs thus obtained are laminated, and a predetermined temperature and pressure are applied. Is integrated by molding. As the thermosetting resin, generally, a resole type phenol-formaldehyde resin is used, but is not limited thereto, and for example, other,
Normal phenol-formaldehyde resin, melamine-
A formaldehyde resin, a urea-formaldehyde resin and the like can be mentioned, and they are appropriately selected and used. The conditions of the heating and pressurizing operations during thermosetting vary depending on the type and amount of the thermosetting resin and the configuration and dimensions of the laminate,
Generally 150-180 ° C, 80-120 kg / c
It is performed at a pressure of m 2 for 30 to 60 minutes.
【００１０】[0010]
【実施例】以下に実施例および比較例を挙げて本発明を
より具体的に説明するが、勿論本発明はこれによって何
等制限されるものではない。尚、実施例および比較例中
の％は特に断らない限り重量％を表す。本発明で用いた
ウォラストナイト含有率の測定方法、積層板の作製方
法、寸法安定性，半田耐熱性の評価方法は以下の通りで
ある。The present invention will be described in more detail with reference to examples and comparative examples below, but of course the present invention is not limited by these examples. The percentages in Examples and Comparative Examples represent% by weight unless otherwise specified. The method for measuring the wollastonite content, the method for producing a laminate, the method for evaluating dimensional stability, and the method for evaluating solder heat resistance used in the present invention are as follows.
【００１１】＜シートのウォラストナイト含有率の測定
方法＞シートおよびウォラストナイトの灰分を測定し、
下記式によりシートのウォラストナイト含有率を求め
た。 ウォラストナイト含有率（％）＝｛（Ａ1 −Ａ2 ）／
（Ａ3 −Ａ2 ）｝×１００ ただし、Ａ1 はウォラストナイト添加シートの灰分
（％）、Ａ2 はウォラストナイト未添加のシートの灰分
（％）、Ａ3 はウォラストナイトの灰分（％）を示す。 ＜積層板の製造方法＞積層板の製造法は、積層板原紙
に、市販水溶性フェノール樹脂（商品名ショウノールＢ
ＲＬ−２８５４：昭和高分子（株）製）を含浸し、乾燥
機で乾燥することにより、樹脂と基材の比率が１５：８
５の一次プリプレグを作製し、次にこの一次プリプレグ
に市販の油変性フェノール樹脂（商品名ショウノールＢ
ＬＳ−３１２２：昭和高分子( 株) 製）を含浸し、乾燥
して、水溶性フェノール樹脂と油変性フェノール樹脂の
両方を合せた樹脂と基材の比率が５０：５０のプリプレ
グを製造した。次にプリプレグを８枚重ね、１６５℃、
１００ｋｇ／ｃｍ2 、６０分間加圧成型することによっ
て、フェノール樹脂積層板を得た。<Method of measuring wollastonite content of sheet> The ash content of the sheet and wollastonite is measured,
The wollastonite content of the sheet was determined by the following equation. Wollastonite content (%) = ｛(A 1 −A 2 ) /
(A 3 −A 2 )｝ × 100, where A 1 is the ash content (%) of the wollastonite-added sheet, A 2 is the ash content (%) of the wollastonite-free sheet, and A 3 is the ash content of the wollastonite. (%). <Production method of laminated board> The production method of the laminated board is such that a commercially available water-soluble phenol resin (trade name: Shonor B
RL-2854: manufactured by Showa Polymer Co., Ltd.) and dried with a drier to obtain a resin to base material ratio of 15: 8.
No. 5 primary prepreg was prepared, and then a commercially available oil-modified phenol resin (trade name: Shaunol B) was added to the primary prepreg.
LS-3122: manufactured by Showa Polymer Co., Ltd.) and dried to prepare a prepreg having a ratio of resin and base material of both water-soluble phenol resin and oil-modified phenol resin of 50:50. Next, stack eight prepregs at 165 ° C,
A phenolic resin laminate was obtained by pressure molding at 100 kg / cm 2 for 60 minutes.
【００１２】＜積層板の寸法安定性の評価方法＞寸法安
定性は熱機械分析装置（商品名：ＴＭＡ ８１４０Ｃ／
（株）リガク製）を用い、圧縮荷重法により荷重２ｇ、
昇降温速度５℃／分の条件で３０℃→１５０℃→３０℃
における試料の寸法変化を測定し、下記に定義する膨張
率、収縮率で評価した。数値が０に近いほど寸法安定性
が良好と判断される。 膨張率（％）＝｛（Ｌ1 −Ｌ0 ）／Ｌ0 ｝×１００ 収縮率（％）＝｛（Ｌ0 −Ｌ2 ）／Ｌ0 ｝×１００ ただし、Ｌ0 は３０℃における試料長さ、Ｌ1 は１５０
℃に達したときの試料長さ、Ｌ2 は昇温後、３０℃に戻
った時の試料長さを示す。<Method for Evaluating Dimensional Stability of Laminated Plate> The dimensional stability was measured using a thermomechanical analyzer (trade name: TMA 8140C /
2g load by compression load method
30 ° C → 150 ° C → 30 ° C at a rate of temperature rise / fall of 5 ° C / min
The dimensional change of the sample was measured and evaluated by the expansion rate and shrinkage rate defined below. The closer the value is to 0, the better the dimensional stability is. Expansion rate (%) = {(L 1 −L 0 ) / L 0 } × 100 Shrinkage rate (%) = {(L 0 −L 2 ) / L 0 } × 100 where L 0 is the sample length at 30 ° C. is, L 1 is 150
The sample length when the temperature reached 30 ° C. and L 2 indicate the sample length when the temperature returned to 30 ° C. after the temperature was raised.
【００１３】実施例１ 国内産広葉樹からのクラフトパルプのスラリーに、ウォ
ラストナイト（商品名：ＮＹＡＤ Ｇ, 巴工業（株）
製, アスペクト比１５）をパルプとウォラストナイトが
固形分比で８５：１５となるように添加した後撹拌し
た。この混合スラリーにメラミン樹脂（商品名：スミレ
ッツレジンＡＣ８, 住友化学（株）製）をパルプとウォ
ラストナイトの合計重量に対して１％添加し、これを抄
紙原料として、坪量１２５ｇ／ｍ2 、密度０．５０ｇ／
ｃｍ3 の積層板原紙を抄造した。得られた原紙のウォラ
ストナイト含有率は９．５％であった。また、この積層
板原紙から積層板を作製し、寸法安定性の評価を行っ
た。Example 1 A slurry of kraft pulp from domestic hardwood was added to wollastonite (trade name: NYAD G, Tomoe Kogyo Co., Ltd.)
And an aspect ratio of 15) were added so that the pulp and wollastonite had a solid content ratio of 85:15, followed by stirring. A melamine resin (trade name: Sumiretz Resin AC8, manufactured by Sumitomo Chemical Co., Ltd.) was added to the mixed slurry at 1% based on the total weight of pulp and wollastonite. 2 , density 0.50g /
A laminated board base paper of cm 3 was produced. The wollastonite content of the obtained base paper was 9.5%. A laminate was prepared from the laminate base paper, and dimensional stability was evaluated.
【００１４】実施例２ ウォラストナイトとして別のウォラストナイト（商品
名：ＷＩＣ−１０, キンセイマテック（株）製, アスペ
クト比２０）を用いた以外は、実施例１と同様にして積
層板原紙を得た。得られた原紙のウォラストナイト含有
率は９．８％であった。また、この積層板原紙から積層
板を作製し、寸法安定性の評価を行った。Example 2 A laminate base paper was produced in the same manner as in Example 1 except that another wollastonite (trade name: WIC-10, manufactured by Kinsei Matech Co., Ltd., aspect ratio 20) was used as wollastonite. I got The wollastonite content of the obtained base paper was 9.8%. A laminate was prepared from the laminate base paper, and dimensional stability was evaluated.
【００１５】比較例１ ウォラストナイトを添加しなかった以外は、実施例１と
同様にして積層板原紙を抄造した。また、この積層板原
紙から積層板を作製し、寸法安定性の評価を行った。 実施例３ ウォラストナイトとして別のウォラストナイト（アスペ
クト比８）を用いた以外は、実施例１と同様にして積層
板原紙を得た。得られた原紙のウォラストナイト含有率
は８．７％であった。また、この積層板原紙から積層板
を作製し、寸法安定性の評価を行った。 実施例および
比較例で得られた結果を表１に示す。Comparative Example 1 A laminate base paper was prepared in the same manner as in Example 1 except that wollastonite was not added. A laminate was prepared from the laminate base paper, and dimensional stability was evaluated. Example 3 A laminate base paper was obtained in the same manner as in Example 1 except that another wollastonite (aspect ratio 8) was used as wollastonite. The wollastonite content of the obtained base paper was 8.7%. A laminate was prepared from the laminate base paper, and dimensional stability was evaluated. Table 1 shows the results obtained in the examples and comparative examples.
【００１６】[0016]
【表１】 [Table 1]
【００１７】表１から明らかなように、ウォラストナイ
トを含有することを特徴とする積層板原紙から製造され
る積層板は、寸法安定性が大幅に改良される。特にアス
ペクト比が１０以上のものを添加したものが優れる。As is evident from Table 1, the dimensional stability of a laminate made from a laminate base paper characterized by containing wollastonite is greatly improved. In particular, those having an aspect ratio of 10 or more are excellent.
【発明の効果】本発明は、プリント配線板の寸法安定性
が良好な積層板を製造するのに最も適した積層板原紙で
あり、その工業的意義は極めて大きい。Industrial Applicability The present invention is a laminated board base paper most suitable for producing a laminated board having good dimensional stability of a printed wiring board, and its industrial significance is extremely large.
Claims (2)
トである電気絶縁積層板原紙。1. An electrically insulating laminate base paper which is a pulp sheet containing wollastonite.
以上である請求項１記載の電気絶縁積層板原紙。2. Wollastonite having an aspect ratio of 10
The base paper for electrically insulating laminate according to claim 1, which is as described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33681896A JPH10168784A (en) | 1996-12-17 | 1996-12-17 | Base paper for electric insulating laminated board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33681896A JPH10168784A (en) | 1996-12-17 | 1996-12-17 | Base paper for electric insulating laminated board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10168784A true JPH10168784A (en) | 1998-06-23 |
Family
ID=18302969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33681896A Pending JPH10168784A (en) | 1996-12-17 | 1996-12-17 | Base paper for electric insulating laminated board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10168784A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001040380A1 (en) * | 1999-11-30 | 2001-06-07 | Otsuka Chemical Co., Ltd. | Resin composition and flexible printed circuit board |
-
1996
- 1996-12-17 JP JP33681896A patent/JPH10168784A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001040380A1 (en) * | 1999-11-30 | 2001-06-07 | Otsuka Chemical Co., Ltd. | Resin composition and flexible printed circuit board |
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