【考案の詳細な説明】[Detailed explanation of the idea]
本考案は、積層板殊に、印刷抵抗体インクの印
刷性及び表面平滑性に優れしかも寸法安定性や表
面抵抗、耐アーク性などが良好な抵抗体印刷用積
層板に関する。
従来、抵抗体印刷用積層板は表面粗さが小なる
が故にフエノール樹脂積層板が最も多用され、特
殊な用途にはエポキシ樹脂積層板が使用されてい
る。しかし、前者は寸法安定性、耐アーク性が悪
く表面抵抗が小さい。また、後者はエポキシ樹脂
と金属との接着性が高いため、成形後鏡面板（金
属製）からの離型が困難となり離型紙を介して成
形するのが通例で、積層板の表面平滑性が損なわ
れる欠点を有していた。
係る問題点を解決するため本考案は、寸法安定
性などの良好なエポキシ樹脂プリプレグ層１の両
表面に表面抵抗が大きく耐アーク性が良好で、か
つ金属との接着剤がフエノール樹脂並みの不飽和
ポリエステル樹脂プリプレグ層２を構成し、これ
を積層成形してなるものである。本考案の積層板
は、その成形に際して従来のエポキシ樹脂積層板
の場合のような離型紙を必要とせず、表面が極め
て平滑となる。
本考案に使用できるエポキシ樹脂プリプレグ層
は、通常の積層板に使用する厚さ0.1〜0.3m/m程
度のもので数枚重ね合せて用いる。基材としては
パンチング性の良好なガラス不織布などを用いた
ものが好ましい。また、両表面に積層する不飽和
ポリエステル樹脂プリプレグとは、好ましくはエ
ポキシ樹脂プリプレグと同一基材に、不飽和ポリ
エステル樹脂を含浸、乾燥または乾燥しないで得
た厚さ0.1〜0.3m/m程度のもので、一方の表面に
１〜２枚重ね合せて用いる。不飽和ポリエステル
樹脂は、不飽和及び飽和多塩基酸と多価アルコー
ルのエステル反応で得られる不飽和アルキツドに
スチレン、メタクリル酸メチル、ジアリルフタレ
ートなどの架橋剤と有機過酸化物などの開始剤と
必要に応じて充填剤などを混合したものである。
全体の構成として、エポキシ樹脂プリプレグ層
の構成比率を高くすれば、不飽和ポリエステル樹
脂特有の成形収縮を防止でき、そり、ねじれなど
の欠点の少ない積層板となる。
次に本考案の実施例について説明する。
実施例 １
エポキシ樹脂100重量部、硬化剤ジアミノジフ
エニルメタン10重量部よりなるエポキシ樹脂組成
物をガラス不織布基材に含浸、乾燥して厚さ0.2
m/mのエポキシ樹脂プリプレグを得た。また、
テレフタル酸系不飽和アルキツド80重量部、架鏡
剤ジアリルフタレートモノマー20重量部、開始剤
ジクミルパーオキシド１重量部よりなる不飽和ポ
リエステル樹脂組成物をガラス不織布基材に含
浸、乾燥して厚さ0.2m/mの不飽和ポリエステル
樹脂プリプレグを得た。
次に、前記エポキシ樹脂プリプレグ６枚重ねの
両表面に不飽和ポリエステル樹脂プリプレグをそ
れぞれ１枚重ね合せ、これをプレスにて温度160
℃、圧力80Kg／cm2で30分間加熱加圧成形して厚さ
0.8m/mの積層板を得た。
従来例 １
石炭酸とホルマリンをアルカリ触媒で反応させ
減圧脱水後フエノール樹脂ワニスをつくり、これ
を紙基材に含浸、乾燥して厚さ0.15m/mのフエノ
ール樹脂プリプレグを得た。次に、該フエノール
樹脂プリプレグを８枚重ね合せ実施例１と同様な
方法で成形し厚さ0.8m/mの積層板を得た。
従来例 ２
実施例１と同様なエポキシ樹脂プリプレグを８
枚重ね合せ離型紙（アセテートフイルム）を介し
て実施例１と同様な方法で加熱加圧成形し厚さ
0.8m/mの積層板を得た。
実施例１，従来例１，２における積層板の特性
試験結果及び表面粗さ測定結果を第１表に示す。
The present invention relates to a laminate, particularly a laminate for printing a resistor, which has excellent printability with printed resistor ink and surface smoothness, as well as good dimensional stability, surface resistance, arc resistance, etc. Conventionally, phenolic resin laminates have been most frequently used as laminates for printing resistors because of their low surface roughness, and epoxy resin laminates have been used for special purposes. However, the former has poor dimensional stability and arc resistance and low surface resistance. In addition, since the latter has high adhesion between the epoxy resin and metal, it is difficult to release the mold from the mirror plate (made of metal) after molding, so it is customary to mold using release paper, which reduces the surface smoothness of the laminate. It had some disadvantages. In order to solve these problems, the present invention has been developed to provide an epoxy resin prepreg layer 1 with good dimensional stability, high surface resistance and good arc resistance on both surfaces, and an adhesive with metal that has the same level of defects as phenolic resin. It constitutes a saturated polyester resin prepreg layer 2, which is laminated and molded. The laminate of the present invention does not require release paper unlike conventional epoxy resin laminates when molded, and has an extremely smooth surface. The epoxy resin prepreg layer that can be used in the present invention has a thickness of about 0.1 to 0.3 m/m, which is used for ordinary laminates, and is used by stacking several layers. As the base material, it is preferable to use glass nonwoven fabric with good punchability. In addition, the unsaturated polyester resin prepreg to be laminated on both surfaces preferably has a thickness of about 0.1 to 0.3 m/m obtained by impregnating the same base material as the epoxy resin prepreg with unsaturated polyester resin and drying or not drying. They are used by stacking one or two sheets on one surface. Unsaturated polyester resin is made by combining an unsaturated alkyd obtained by the ester reaction of an unsaturated or saturated polybasic acid with a polyhydric alcohol, a crosslinking agent such as styrene, methyl methacrylate, or diallylphthalate, and an initiator such as an organic peroxide. It is a mixture of fillers, etc. depending on the situation. As for the overall structure, by increasing the composition ratio of the epoxy resin prepreg layer, molding shrinkage peculiar to unsaturated polyester resin can be prevented, resulting in a laminate with fewer defects such as warping and twisting. Next, embodiments of the present invention will be described. Example 1 A glass nonwoven fabric base material is impregnated with an epoxy resin composition consisting of 100 parts by weight of epoxy resin and 10 parts by weight of hardening agent diaminodiphenylmethane, and dried to a thickness of 0.2
An epoxy resin prepreg of m/m was obtained. Also,
An unsaturated polyester resin composition consisting of 80 parts by weight of a terephthalic acid-based unsaturated alkyd, 20 parts by weight of diallyl phthalate monomer as a cross-linking agent, and 1 part by weight of dicumyl peroxide as an initiator is impregnated into a glass nonwoven fabric base material and dried to obtain a thickness. A 0.2 m/m unsaturated polyester resin prepreg was obtained. Next, one layer of unsaturated polyester resin prepreg was layered on both surfaces of the six layers of epoxy resin prepreg, and this was pressed at a temperature of 160
℃, pressure 80Kg/ cm2 for 30 minutes to form the thickness.
A 0.8m/m laminate was obtained. Conventional Example 1 A phenolic resin varnish was prepared by reacting carbolic acid and formalin with an alkali catalyst and dehydrating under reduced pressure, and this was impregnated into a paper base material and dried to obtain a phenolic resin prepreg with a thickness of 0.15 m/m. Next, eight sheets of the phenolic resin prepreg were stacked and molded in the same manner as in Example 1 to obtain a laminate with a thickness of 0.8 m/m. Conventional Example 2 8 epoxy resin prepregs similar to Example 1
The sheets were stacked together and molded under heat and pressure in the same manner as in Example 1 through release paper (acetate film) to obtain the desired thickness.
A 0.8m/m laminate was obtained. Table 1 shows the property test results and surface roughness measurement results of the laminates in Example 1 and Conventional Examples 1 and 2.
【表】
第１表から明らかなように、本考案は、寸法安
定性、表面抵抗で従来のフエノール樹脂積層板よ
り極めて優れ、耐アーク性ではエポキシ樹脂積層
板よりさらに良好である。また、本考案で最も問
題としている表面粗さ及び抵抗体インクの印刷性
は、実用上問題のないフエノール樹脂積層板並み
の特性を有しており、その実用的価値は極めて大
なるものである。[Table] As is clear from Table 1, the present invention is extremely superior to conventional phenolic resin laminates in terms of dimensional stability and surface resistance, and even better than epoxy resin laminates in terms of arc resistance. In addition, the surface roughness and printability of the resistor ink, which are the main issues in this invention, have properties comparable to those of phenolic resin laminates, which pose no practical problems, and their practical value is extremely great. .
【図面の簡単な説明】[Brief explanation of the drawing]
図面は本考案の層構成の一例を示す断面説明図
である。
１はエポキシ樹脂含浸プリプレグ層、２は不飽
和ポリエステル樹脂含浸プリプレグ層。
The drawing is an explanatory cross-sectional view showing an example of the layer structure of the present invention. 1 is an epoxy resin-impregnated prepreg layer, and 2 is an unsaturated polyester resin-impregnated prepreg layer.