JPH0260918A - Resin composition for hybrid ic and hybrid ic manufactured by using the same - Google Patents

Resin composition for hybrid ic and hybrid ic manufactured by using the same

Info

Publication number
JPH0260918A
JPH0260918A JP21181888A JP21181888A JPH0260918A JP H0260918 A JPH0260918 A JP H0260918A JP 21181888 A JP21181888 A JP 21181888A JP 21181888 A JP21181888 A JP 21181888A JP H0260918 A JPH0260918 A JP H0260918A
Authority
JP
Japan
Prior art keywords
hybrid
resin
resin composition
epoxy resin
epichlorohydrin
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
Application number
JP21181888A
Other languages
Japanese (ja)
Inventor
Eiji Omori
英二 大森
Manabu Yamane
学 山根
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Corp
Original Assignee
Hitachi Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Chemical Co Ltd filed Critical Hitachi Chemical Co Ltd
Priority to JP21181888A priority Critical patent/JPH0260918A/en
Publication of JPH0260918A publication Critical patent/JPH0260918A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05KPRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00Apparatus or processes for manufacturing printed circuits
    • H05K3/22Secondary treatment of printed circuits
    • H05K3/28Applying non-metallic protective coatings
    • H05K3/285Permanent coating compositions

Landscapes

  • Epoxy Resins (AREA)
  • Paints Or Removers (AREA)
  • Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)

Abstract

PURPOSE:To provide a resin compsn. for a hybrid IC being capable of adjusting the film thickness within a specified range and having excellent that cycle resistance when the film is thin by mixing four specified kinds of resins, a curing accelerator and an org. solvent. CONSTITUTION:The title resin compsn. for a hybrid IC is prepd. by mixing an epoxy resin (A) derived from bisphenol A and epichlorohydrin, a cresol- novolak epoxy resin (B), a phenol-novolak resin (C), a reaction product (D) having a molecular structure of the formula (wherein n is a positive integer) obtd. by reacting approximately equimolar amt. of epichlorohydrin and 2,2-bis(4'- oxyphenyl)propane, a curing accelerator (E) (e.g., dimethylbenzylamine) and an org. solvent (F) (e.g., toluene). This resin compsn is used as a coating material for coating a hybrid IC and improving protection from external forces and reliability of humidity resistance.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はハイブリッドIC用樹脂組成物に関し。[Detailed description of the invention] (Industrial application field) The present invention relates to a resin composition for hybrid IC.

薄型でかつ高信頼性のハイブリッドICを製造するのに
適した樹脂組成物およびこれを塗布したハイブリッドI
CK関する。
Resin composition suitable for manufacturing a thin and highly reliable hybrid IC and Hybrid I coated with the same
Regarding CK.

(従来の技術) 近年、民生機器や産業用機器に使用される電子機器が小
型化および薄型化するにつれて、これに使用されるハイ
ブリッドIC(インテグラル・サーキット)もまた同様
に小型化、薄型化および高集積化が図られる傾向にある
(Prior Art) In recent years, as electronic devices used in consumer and industrial equipment have become smaller and thinner, the hybrid ICs (integral circuits) used in these devices have also become smaller and thinner. There is also a trend toward higher integration.

従来のハイブリッドICの製造法においては。In the conventional hybrid IC manufacturing method.

回路が印刷されたアルミナ基板上にIC,)ランジスタ
、コンデンサ等を種々の方法で搭載した後。
After mounting ICs, transistors, capacitors, etc. on the printed alumina substrate using various methods.

外力からの保護と耐湿信頼性を向上するために外装用樹
脂で被覆する方法がとられている。
In order to improve protection from external forces and moisture resistance reliability, a method of coating with exterior resin is used.

該外装用樹脂としては、粉体エポキシ樹脂、液状フェノ
ール樹脂、液状エポキシ樹脂などが使用されており、粉
体エポキシ樹脂では流動浸漬法。
As the exterior resin, powdered epoxy resin, liquid phenol resin, liquid epoxy resin, etc. are used. For powdered epoxy resin, the fluidized dipping method is used.

液状フェノール樹脂および液状エポキシ樹脂ではデイン
ピング法によりハイブリッドICを被覆した後に加熱処
理が行なわれ、硬化されている。
With liquid phenol resin and liquid epoxy resin, a hybrid IC is coated by a deimping method and then heated and cured.

粉体エポキシ樹脂は大量生産ができるという特長を有し
ているが、最近さらに厳しくなっている耐湿信頼性(プ
レッシャー・クツカー試験)に劣る欠点がある。一方、
液状フェノール樹脂および液状エポキシ樹脂は、プレッ
シャー・クツカー試験には良好な結果を示すが、無機質
充填剤を多量拠金んでいるため作業時に沈降しやすく、
シかも膜厚が500〜1oooμmと厚くなり、ハイブ
リッドICの薄型化ができに〈〈、また耐冷熱衝撃性に
劣るという欠点を有する。
Powdered epoxy resin has the advantage of being mass-producible, but it has the disadvantage of inferior moisture resistance reliability (pressure Kutzker test), which has recently become more stringent. on the other hand,
Liquid phenolic resins and liquid epoxy resins show good results in the pressure Kutzker test, but because they contain a large amount of inorganic filler, they tend to settle during work.
However, the film thickness is as thick as 500 to 100 μm, which makes it difficult to make the hybrid IC thinner, and it also has the disadvantage of poor thermal shock resistance.

これらの欠点を改良したハイブリッドIC用の外装用塗
料としてノンフィラー系のエポキシ樹脂塗料があるが、
この塗料は薄型でかつ耐湿性Kl−を優れるものの、塗
嘆が硬いため厚く塗布しすぎると耐ヒートサイクル性が
悪化するという欠点を有しているため塗嗅厚さが50〜
100μm程度に限定される。
There is a non-filler epoxy resin paint as an exterior paint for hybrid ICs that improves these drawbacks.
Although this paint is thin and has excellent moisture resistance Kl-, it has the disadvantage that heat cycle resistance deteriorates if applied too thick because the coating is hard.
It is limited to about 100 μm.

(発明が解決しようとする課題) 本発明の目的は、前記の従来の・・イブリントIC用の
外装材の欠点を改良し膜厚を50〜200μm穆度に必
要に応じて調整でき、かつ薄膜で耐ヒートサイクル性に
優れ九ノ翫イブリッドIC用樹脂組成物ならびにこの樹
脂組成物で被覆したハイブリッドICを提供するもので
ある。
(Problems to be Solved by the Invention) It is an object of the present invention to improve the drawbacks of the conventional outer packaging material for Evelint IC, to be able to adjust the film thickness to 50 to 200 μm as needed, and to provide a thin film. The present invention provides a resin composition for a Kunokan hybrid IC that has excellent heat cycle resistance, and a hybrid IC coated with this resin composition.

(課題を解決するための手段) 本発明け、(a)エビ−ピス型エポキシ樹脂、(b)タ
レゾールノボランク型エポキシ樹脂、(C)フェノール
ノボラック樹脂、(d)エピクロルヒドリンと2.2−
ヒス(4′−、オキシフェニル)プロパンとヲホホ等モ
ルで反応させて得られる式(1)で示される分子構造を
有する反応生成物、(e)硬化促進剤および(f)有機
溶剤を含有してなるハイブリッドIC用樹脂組成物に関
する。
(Means for Solving the Problems) The present invention includes (a) Ebi-pis type epoxy resin, (b) Talezol novolank type epoxy resin, (C) phenol novolak resin, (d) epichlorohydrin and 2.2-
Contains a reaction product having a molecular structure represented by formula (1) obtained by reacting equimolar amounts of his(4'-,oxyphenyl)propane, (e) a curing accelerator, and (f) an organic solvent. The present invention relates to a resin composition for hybrid IC.

(ただし、nは正の整数である) 本発明の(a)成分であるエピ−ピス型エポキシ樹脂と
は、ビスフェノールAとエピクロルヒドリンから誘導さ
れるエポキシ樹脂であり、これらは耐熱衝撃性の点から
エポキシ当量が250以上のものが好ましく、油化シェ
ル社all!EP−1007(r−ボキシ当ft200
0)、BP−1004(xボキシ当量950)などが挙
げられる。
(However, n is a positive integer.) The epi-pis type epoxy resin, which is the component (a) of the present invention, is an epoxy resin derived from bisphenol A and epichlorohydrin, and these are used in terms of thermal shock resistance. Epoxy equivalents of 250 or more are preferred, and Yuka Shell Co., Ltd. all! EP-1007 (r-boxy ft200
0), BP-1004 (x-boxy equivalent weight 950), and the like.

本発明に使用される(b)成分のクレゾールノボラック
型エポキシ樹脂としては、ブレゾールノボランク樹脂と
エピクロルヒドリンから誘導されるエポキシ樹脂が用い
られ、東部化成社′!MYDCN−702(エポキシ当
i−210)、住人化成社製ES CN−195(エホ
#シ当−3220)などが挙げられる。該クレゾールノ
ボランク型エポキシ樹脂の配合割合は、耐熱性、耐湿信
頼性および耐熱衝撃性の点から全エポキシ樹脂の5〜5
5重量愛であることが好ましい。
As the cresol novolak type epoxy resin used in the present invention as component (b), an epoxy resin derived from a bresol novolak resin and epichlorohydrin is used. Examples include MYDCN-702 (Epoxy-210) and ES CN-195 (Epoxy-3220) manufactured by Sumitomo Chemical Co., Ltd. The blending ratio of the cresol novolanc type epoxy resin is 5 to 5% of the total epoxy resin from the viewpoint of heat resistance, moisture resistance reliability, and thermal shock resistance.
Preferably 5 weight love.

本発明に使用される(c)成分のフェノールノボラック
樹脂としては、フェノール類とホルムアルデヒドの重縮
金物が用いられ、明和化成社裂H−1(水酸基当t10
6)、日本化薬社製PN(水酸基当ftl 06 )な
どが挙げられる。その配合量は耐熱劣化特性および強度
の点から組成物中のエポキシ基1個に対し0.85〜1
.1モルの範囲が好ましい。
As the phenol novolak resin of component (c) used in the present invention, a polycondensed metal of phenols and formaldehyde is used, and Meiwa Kasei's Fragment H-1 (t10 per hydroxyl group) is used.
6), Nippon Kayaku Co., Ltd.'s PN (hydroxyl group ftl 06 ), and the like. From the viewpoint of heat deterioration resistance and strength, the blending amount is 0.85 to 1 per epoxy group in the composition.
.. A range of 1 mole is preferred.

本発明に使用される(dl戒分のエピクロルヒドリン、
!=2.2−ピス(4′−オキシフェニル)プロパンと
をほぼ等モルで反応させて得られる反応生成物とは以下
に示す分子構造を有するものである。
Used in the present invention (dl precept epichlorohydrin,
! The reaction product obtained by reacting approximately equimolar amounts of 2.2-pis(4'-oxyphenyl)propane has the molecular structure shown below.

はぼ等モルとは高分子量の反応生成物を生成する配合割
合を指し9通常エピクロルヒドリン1モルに対して2.
2−ピス(4′−オキシフェニル)プロパン0.90〜
1.10モルの範囲とされる。上記の構造においてnけ
正の整数であるが、nが80〜120の範囲が、密着性
が良好でかつ溶剤の希釈性も良好であるので好ましい。
``Equimolar'' refers to the mixing ratio that produces a high molecular weight reaction product.9 Usually, 2.0 molar to 1 mole of epichlorohydrin.
2-pis(4'-oxyphenyl)propane 0.90~
The range is 1.10 moles. In the above structure, n is a positive integer, and it is preferable that n is in the range of 80 to 120 because it provides good adhesion and good dilutability with a solvent.

また(dl成分の反応生成物は上式においてnが100
程度では、室温で固体であるため、ブチルセロソルブ、
メチルエチルケトンなどの溶解可能な溶剤で溶解して使
用しても良い。市販の樹脂としては、ユニオンカーバイ
ド社製のフェノキシ樹脂がある。fdl成分の使用割合
としてFif&)(b+およびFC)成分の総量100
重量部に対し0.1重量部から200重量部の範囲で使
用することが好ましい。
Also, (the reaction product of the dl component is n in the above formula is 100
Butyl cellosolve, because it is solid at room temperature,
It may be used by dissolving it in a soluble solvent such as methyl ethyl ketone. Commercially available resins include phenoxy resins manufactured by Union Carbide. The total amount of Fif &) (b+ and FC) components is 100 as the usage ratio of fdl components.
It is preferable to use it in a range of 0.1 parts by weight to 200 parts by weight.

本発明に使用される(e)成分の硬化促進剤としては、
第三級アミン類、イミダゾール類、テトラ置換ボレート
、トリフェニルホスフィンなどが挙ケられる。
As the curing accelerator of component (e) used in the present invention,
Examples include tertiary amines, imidazoles, tetra-substituted borates, and triphenylphosphine.

硬化性および安定性のバランスから、硬化促進剤の配合
割合はフェノールノボラック樹脂に対して0.3〜25
重量%の範囲が好呻しい。
From the balance of curability and stability, the blending ratio of curing accelerator to phenol novolak resin is 0.3 to 25.
The weight % range is favorable.

本発明に使用される(f)成分の有機溶剤としては。The organic solvent as component (f) used in the present invention is as follows.

芳香族系炭化水素、アルコール系溶剤、ケトン系溶剤な
どが挙げられる。有機溶剤の配合割合は樹脂組成物中の
40〜80重t%とすることが好ましい。
Examples include aromatic hydrocarbons, alcohol solvents, ketone solvents, and the like. The blending ratio of the organic solvent is preferably 40 to 80% by weight in the resin composition.

凍た1本発明の樹脂組成物を・・イブリッドICに塗布
する方法としては特に制限はなく、浸漬後。
There are no particular restrictions on the method of applying the resin composition of the present invention to hybrid ICs, including after immersion.

スプレー法、はけ塗りなど一般的な塗料の塗装方法が採
用できる。塗布後にハイブリッドICは加熱されて塗布
膜は硬化される。
General paint application methods such as spraying and brushing can be used. After coating, the hybrid IC is heated to harden the coating film.

本発明の樹脂組成物には目的に応じて着色剤。The resin composition of the present invention may contain a coloring agent depending on the purpose.

カンプリング剤、消泡剤、難燃剤を添加することが出来
る。
Camping agents, antifoaming agents, and flame retardants can be added.

(実施例) 次に本発明を実施例および比較例により説明する。(Example) Next, the present invention will be explained with reference to Examples and Comparative Examples.

比較例1 エピ−ピス型エポキシ樹脂 (油化シェル社NEP−1007)    80重量部
クレゾールノボラック型エポキシ樹脂 (東部化我社!!YDCN−702)    20重量
部フェノールノボラック樹脂 (明和化成社製H−1)       14.3重量部
ジメチルベンジルアミン      0.3 ff1f
l工チレングリコールモノエチルエーテル100重量部 トルエン               15重量部を
ガラス製フラスコ内で70〜100℃で3〜4時間溶解
し、透明な樹脂組成物Aを得た。
Comparative Example 1 Epi-pis type epoxy resin (Yuka Shell Co., Ltd. NEP-1007) 80 parts by weight Cresol novolak type epoxy resin (Tobu Kagasha!! YDCN-702) 20 parts by weight Phenol novolac resin (H- manufactured by Meiwa Kasei Co., Ltd.) 1) 14.3 parts by weight dimethylbenzylamine 0.3 ff1f
A transparent resin composition A was obtained by dissolving 100 parts by weight of ethylene glycol monoethyl ether and 15 parts by weight toluene at 70 to 100°C for 3 to 4 hours in a glass flask.

得られた樹脂組成物Aを用い、デイツプ方式によシバイ
ブリッドICを外装被覆した後、120℃で1時間加熱
乾燥を行ないさらに樹脂組成物Aにデイツプし、120
’Cで1時間、ついで150℃で2時間加熱硬化した。
Using the obtained resin composition A, after coating the exterior of a sibibrid IC by a dip method, it was heated and dried at 120°C for 1 hour, and then further soaked in the resin composition A.
It was cured by heating at 150° C. for 1 hour and then at 150° C. for 2 hours.

得られ念硬化物について下記特性の評価を行なった。そ
の結果を第1表に示す。
The following properties of the obtained hardened product were evaluated. The results are shown in Table 1.

(1)@厚の測定 外装被覆前後のハイブリッドICの基板平坦部の厚さの
差を測定し、2等分した値を片面の膜厚とした。
(1) @Measurement of Thickness The difference in thickness of the flat part of the hybrid IC substrate before and after the outer coating was measured, and the value divided into two was taken as the film thickness on one side.

(2)桁湿M頼性試賎(ブレソ/ヤー・クツカー試験) 121’C,2気圧、100多RHの水蒸気下に外装被
覆後の・・イブリントICをさらし、第1表に示す時間
毎に印刷抵抗の変化を測定し、初期値が1.5%以上変
化した物を不良発生物とし、各時間毎の不良発生数を調
べた。この試、濾は試料数20個について行なった。
(2) Digit humidity M reliability test sample (Bresso/Yar-Kutsker test) After being exposed to water vapor at 121'C, 2 atm, and 100% RH, the Ibrint IC after being coated was exposed for the times shown in Table 1. Changes in printing resistance were measured, and those whose initial value changed by 1.5% or more were considered defective, and the number of defects generated each time was investigated. In this trial, filtration was performed on 20 samples.

(3)  ヒートサイクル試験 外装被覆後のハイブリッドICに−40”Cで30分、
続いて125℃で30分を1サイクルとした熱」!j撃
を加え、25サイクル毎に印刷抵抗の変化を測定し、初
期値の1,5チ以上変化し念物を不良発生物とし、各サ
イクル毎の不良発生数を調べた。この試験は前記と同様
に試料数20個について行なった。
(3) Heat cycle test After coating the hybrid IC, heat cycle test was carried out at -40"C for 30 minutes.
This was followed by heating at 125°C for 30 minutes per cycle. J shock was applied, and changes in printing resistance were measured every 25 cycles, and items that changed by more than 1.5 inches from the initial value were considered defective items, and the number of defects generated in each cycle was investigated. This test was conducted on 20 samples in the same manner as above.

比較fl12 樹脂組成物を下記の成分からなる樹脂組成物Bに代えた
以外は実施例1と同様にしてハイブリッドICを作製し
、l1fJ様の評価を行なった。その結果を第1表建示
した。
Comparison fl12 A hybrid IC was produced in the same manner as in Example 1, except that the resin composition was replaced with resin composition B consisting of the following components, and evaluation was performed on l1fJ. The results are presented in Table 1.

エピ−ピス型エポキシ樹脂 (油化シェル社製EP−1007)    60重量部
クレゾールノボランク型エポキシ樹脂 (東部化成社製YDCN−702)    40重量部
フェノールノボランク樹脂 (FIA和化或社久H−1)       23.4i
量部ジメチルベンジルアミン      0.3 重f
iエチレングリコールモノエチルエーテル100’ii
i部 トルエン              20重量部実施
例1 比較例1で得た樹脂組成物人100重量部に。
Epi-pis type epoxy resin (EP-1007 manufactured by Yuka Shell Co., Ltd.) 60 parts by weight Cresol novolank type epoxy resin (YDCN-702 manufactured by Tobu Kasei Co., Ltd.) 40 parts by weight Phenol novolank resin (FIA Waka Orshakyu H- 1) 23.4i
Quantity part dimethylbenzylamine 0.3 weight f
iEthylene glycol monoethyl ether 100'ii
i part toluene 20 parts by weight Example 1 100 parts by weight of the resin composition obtained in Comparative Example 1.

フェノキシm1llKHH(ユニオンカーバイド社製、
商品名)の30重量%、エチレングリコールモノエチル
エーテル溶液80重量部を混合攪拌して樹脂組成物Cを
得た。樹脂組成物Aを樹脂組成物Cに変えた以外は比較
例1と同様にしてハイフリントICを作製し、比・咬例
1と同様の評価を行なった。その結果を第1表に示した
Phenoxy mlllkhh (manufactured by Union Carbide,
A resin composition C was obtained by mixing and stirring 30% by weight of the product (trade name) and 80 parts by weight of an ethylene glycol monoethyl ether solution. A high flint IC was produced in the same manner as in Comparative Example 1, except that resin composition A was replaced with resin composition C, and the same evaluations as in Ratio and Mesh Example 1 were performed. The results are shown in Table 1.

実施例2 比較例2で得た樹脂組成物B Loom景部にフェノキ
シ樹脂PKI(t((ユニオンカーバイド社製。
Example 2 Resin composition B obtained in Comparative Example 2 Phenoxy resin PKI (manufactured by Union Carbide Co., Ltd.) was added to the room area.

商品名)の30重号チ、エチレングリコールモノエチル
エーテル溶液80重景部を混合攪拌して樹脂組成物りを
得意。樹脂組成物Aを樹脂組成物りに変えた以外は比較
例1と同様にして・・イブリッドICを作製し、比較例
1と同様の評価を行なつた。その結果を第1表に示した
We are good at preparing resin compositions by mixing and stirring 80 parts of ethylene glycol monoethyl ether solution. An hybrid IC was produced in the same manner as in Comparative Example 1 except that resin composition A was changed to resin composition R, and the same evaluation as in Comparative Example 1 was performed. The results are shown in Table 1.

第1表の結果から本発明になるハイブリッドIC用樹脂
組成物は膜厚を50〜200μm程度に調整でき、従来
のものと比較し耐湿性は同等で。
From the results shown in Table 1, the film thickness of the hybrid IC resin composition of the present invention can be adjusted to about 50 to 200 μm, and the moisture resistance is equivalent to that of the conventional composition.

特にヒートサイクル性に優れることが分かる。It can be seen that it has particularly excellent heat cycle properties.

Claims (1)

【特許請求の範囲】 1、(a)エピーピス型エポキシ樹脂、(b)クレゾー
ルノボラック型エポキシ樹脂、(c)フェノールノボラ
ック樹脂、(d)エピクロルヒドリンと2,2−ピス(
4′−オキシフェニル)プロパンとをほぼ等モルで反応
させて得られる式(1)で示される分子構造を有する反
応生成物、(e)硬化促進剤および(f)有機溶剤を含
有してなるハイブリッドIC用樹脂組成物。 ▲数式、化学式、表等があります▼(1) (ただしnは正の整数である) 2、請求項1記載の樹脂組成物の硬化物で被覆されたハ
イブリッドIC。
[Claims] 1. (a) Epipis type epoxy resin, (b) Cresol novolac type epoxy resin, (c) Phenol novolak resin, (d) Epichlorohydrin and 2,2-pis (
4'-oxyphenyl)propane in approximately equimolar amounts, containing a reaction product having a molecular structure represented by formula (1), (e) a curing accelerator, and (f) an organic solvent. Resin composition for hybrid IC. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (1) (where n is a positive integer) 2. A hybrid IC coated with a cured product of the resin composition according to claim 1.
JP21181888A 1988-08-26 1988-08-26 Resin composition for hybrid ic and hybrid ic manufactured by using the same Pending JPH0260918A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21181888A JPH0260918A (en) 1988-08-26 1988-08-26 Resin composition for hybrid ic and hybrid ic manufactured by using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21181888A JPH0260918A (en) 1988-08-26 1988-08-26 Resin composition for hybrid ic and hybrid ic manufactured by using the same

Publications (1)

Publication Number Publication Date
JPH0260918A true JPH0260918A (en) 1990-03-01

Family

ID=16612103

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21181888A Pending JPH0260918A (en) 1988-08-26 1988-08-26 Resin composition for hybrid ic and hybrid ic manufactured by using the same

Country Status (1)

Country Link
JP (1) JPH0260918A (en)

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