JPH02208024A - Plasticized soft synthetic resin product having transparent conductive layer and transfer member for forming transparent conductive layer - Google Patents
Plasticized soft synthetic resin product having transparent conductive layer and transfer member for forming transparent conductive layerInfo
- Publication number
- JPH02208024A JPH02208024A JP1028607A JP2860789A JPH02208024A JP H02208024 A JPH02208024 A JP H02208024A JP 1028607 A JP1028607 A JP 1028607A JP 2860789 A JP2860789 A JP 2860789A JP H02208024 A JPH02208024 A JP H02208024A
- Authority
- JP
- Japan
- Prior art keywords
- transparent conductive
- conductive layer
- top coat
- layer
- synthetic resin
- 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.)
- Granted
Links
- 238000012546 transfer Methods 0.000 title claims abstract description 10
- 229920003002 synthetic resin Polymers 0.000 title claims description 15
- 239000000057 synthetic resin Substances 0.000 title claims description 15
- 239000010410 layer Substances 0.000 claims abstract description 40
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000012790 adhesive layer Substances 0.000 claims abstract description 6
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 15
- 239000004800 polyvinyl chloride Substances 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims 1
- 238000010030 laminating Methods 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 16
- 238000000576 coating method Methods 0.000 abstract description 10
- 239000004014 plasticizer Substances 0.000 abstract description 6
- 239000002904 solvent Substances 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 239000003973 paint Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229910001111 Fine metal Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009408 flooring Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- -1 diothyl phthalate Chemical compound 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Landscapes
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
- Non-Insulated Conductors (AREA)
- Decoration By Transfer Pictures (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、帯電防止機能を具備した可塑化軟質合成樹脂
製品および該製品に帯電防止機能を付与するための部材
に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a plasticized soft synthetic resin product having an antistatic function and a member for imparting the antistatic function to the product.
（従来の技術）
近年、半導体の生産量の増加に伴い、半導体ウェハーの
運搬容器や保存容器、クリーンルームやバイオクリーン
ルームにおける床材、壁材、カーテン等に導電性塗料を
塗布して帯電防止機能を付与し、静電気による半導体の
破壊の防止や、床、壁、カーテン等クリーンルーム内へ
の塵埃の付着の防止等が行われている。(Conventional technology) In recent years, as the production of semiconductors has increased, conductive paints have been applied to containers for transporting and storing semiconductor wafers, flooring materials, wall materials, curtains, etc. in clean rooms and bio-clean rooms to provide antistatic properties. It is applied to prevent semiconductors from being destroyed by static electricity and to prevent dust from adhering to floors, walls, curtains, and other surfaces in clean rooms.
これらの目的のため、従来は、カーボン粉末や金属微粉
末を合成樹脂フィルムに練り込んだり、又はこれらの導
電性物質を混入して導電性を付与した塗料を塗布して、
不導体の帯電を防止することが広〈実施されている。For these purposes, conventionally, carbon powder or fine metal powder was kneaded into a synthetic resin film, or a paint containing these conductive substances to give conductivity was applied.
Prevention of electrostatic charging of nonconductors is widely practiced.
しかしながら、カーボンブラックや金属微粉末を合成樹
脂に練り込んで得られるフィルムは、透明性が悪く、包
装した後にその内容物を見ることができないとか、容器
内の半導体ウェハーの個数を光センサーでカウントしよ
うとしても不可能であったり、あるいは、クリーンル−
ム内のカーテン越しに向う側の様子を見ることが出来な
い等の問題があった。However, the film obtained by kneading carbon black or fine metal powder into synthetic resin has poor transparency, making it impossible to see the contents after packaging, and the number of semiconductor wafers in the container can be counted using optical sensors. If you try, it may not be possible, or you may not be able to
There were problems such as not being able to see what was happening on the other side through the curtains inside the room.
一方、導電性物質を混入してなる導電性塗料においては
、塗膜の色調が灰色または黒色がかるため、被塗物の色
調を損うことになり好ましくなかった。On the other hand, in the case of a conductive paint containing a conductive substance, the color tone of the coating film becomes gray or blackish, which impairs the color tone of the object to be coated, which is not preferable.
このようなフィルムの透明性を改良する導電性塗料に関
して改善案が提案され、例えば特定の粒径と組成よりな
る酸化金属粉末を塗膜形成樹脂に特定量配合してなる導
電性透明塗料が知られている。（特開昭５７−８５８６
６号公報、特開昭５８−９１７７７号公報参照）。Improvement plans have been proposed for conductive paints that improve the transparency of such films. For example, conductive transparent paints are known in which a specific amount of metal oxide powder with a specific particle size and composition is blended into a film-forming resin. It is being (Unexamined Japanese Patent Publication No. 57-8586
6 and Japanese Patent Application Laid-open No. 58-91777).
（発明が解決しようとする課題）
しかるに、前記した公知の透明導電性塗料を前述した可
塑化軟質合成樹脂例えば可塑化軟質ポリ塩化ビニル樹脂
を素材とする容器、床材、シート等に塗布し、その上に
保護用のトップコートを施したものは、導電性塗膜の表
面抵抗が増大し、適正な導電性を得ることが出来ず、帯
電防止機能が充分発揮できないという問題点が存在した
。(Problems to be Solved by the Invention) However, when the above-described known transparent conductive paint is applied to containers, flooring materials, sheets, etc. made of the above-mentioned plasticized soft synthetic resin, such as plasticized soft polyvinyl chloride resin, When a protective top coat is applied thereon, the surface resistance of the conductive coating film increases, and proper conductivity cannot be obtained, resulting in a problem that the antistatic function cannot be sufficiently exhibited.
本発明は、前記した従来の透明導電性塗料による帯電防
止機能の低下を防止した可塑化軟質合成樹脂製品および
該製品を得るための部材を提供することを目的としてい
る。The object of the present invention is to provide a plasticized soft synthetic resin product that prevents the deterioration of the antistatic function caused by the conventional transparent conductive paint mentioned above, and a member for obtaining the product.
（課題を解決するための手段）
上記目的を達成するため、本発明者等は種々実験研究を
行なった。(Means for Solving the Problem) In order to achieve the above object, the present inventors conducted various experimental studies.
通常、可塑化軟質合成樹脂例えばポリ塩化ビニル樹脂（
ＰＶＣ）上に透明導電性塗料を塗布して導電性塗膜を形
成し、該膜を保護するためにトップコート層を施してい
る。ところが、このトップコートの溶剤により、基材Ｐ
ＶＣ中の可塑剤成分が導電性塗膜中にマイグレーション
し、相対的に導電性粒子が希釈されることによってその
表面抵抗が増大することが判明した。Usually, plasticized soft synthetic resin such as polyvinyl chloride resin (
A transparent conductive paint is applied onto PVC to form a conductive film, and a top coat layer is applied to protect the film. However, due to the solvent of this top coat, the base material P
It has been found that the plasticizer component in VC migrates into the conductive coating film, and the conductive particles are relatively diluted, thereby increasing the surface resistance.
そこで、本発明者等は前記の現象が発生しないようにし
て所定の導電性を有する透明導電性層をＰＶＣ素材上に
形成するため、離型紙上へトップコート層、透明導電性
層を順次積層した転写部材をあらかじめ作成し、前記複
層を、粘着層を表面に形成したＰＶＣ上へ転写すること
により、その目的を達成することが可能となった。Therefore, in order to prevent the above phenomenon from occurring and form a transparent conductive layer having a predetermined conductivity on a PVC material, the present inventors sequentially laminated a top coat layer and a transparent conductive layer on a release paper. It became possible to achieve this objective by preparing a transfer member in advance and transferring the multilayer onto PVC with an adhesive layer formed on the surface.
（作用）
本発明は前記のように構成したことにより、トットプコ
ート層内の溶剤成分は、ＰｖＣ表面に転写される以前に
揮散するため、透明導電性層とトップコート層がＰｖＣ
表面に転写される時点では、基材的可塑剤のマイグレー
ションは生ぜず、透明導電性層の導電率は所定の値のも
のが得られる。(Function) By having the present invention configured as described above, the solvent component in the top coat layer evaporates before being transferred to the PvC surface, so that the transparent conductive layer and the top coat layer are
At the time of transfer to the surface, migration of the base plasticizer does not occur, and the conductivity of the transparent conductive layer has a predetermined value.
本発明では、トップコート層が厚膜であると導電率が低
下し、一方、導電コート層が厚膜であると導電率が高く
なる傾向を示す。したがって、トップコート層と導電コ
ート層の膜厚を調整することにより所望の導電率とする
ことができる。In the present invention, when the top coat layer is a thick film, the electrical conductivity tends to decrease, while when the conductive coat layer is a thick film, the electrical conductivity tends to increase. Therefore, desired conductivity can be achieved by adjusting the thicknesses of the top coat layer and the conductive coat layer.
（実施例）
図面によって本発明を説明する。第１図（イ）に示すよ
うに、離型紙１ （７ＯＮ−０１８５藤森工業社製）に
トップコート２を施こす。次いで同（ロ）のようにトッ
プコート層２上に透明導電性層３を積層する。そして同
（ハ）のように離型紙をはがし、積層されたトップコー
ト層と透明導電性層を、同（ニ）に示すように予め粘着
剤層４将
を設けた基Ｍ５上に転写し、同（ホ）のように積層され
た透明導電性膜を有するＰＶＣ素材を完成する。第２図
は従来技術を示しており、先ず、同（イ）においては基
材５上にプライマー層６を塗着形成する。これは必要の
ない場合もある。次に同（ロ）のように透明導電性塗膜
により塗膜３が形成され、最後に同（ハ）によって透明
導電性塗膜の保護のためトップコート２が塗装される。(Example) The present invention will be explained with reference to the drawings. As shown in FIG. 1(a), a top coat 2 is applied to a release paper 1 (7ON-0185 manufactured by Fujimori Industries). Next, the transparent conductive layer 3 is laminated on the top coat layer 2 as in (b). Then, as in (c), the release paper is peeled off, and the laminated top coat layer and transparent conductive layer are transferred onto the base M5 on which four adhesive layers have been provided in advance, as shown in (d). A PVC material having a laminated transparent conductive film is completed as shown in (e). FIG. 2 shows a conventional technique. First, in FIG. 2(a), a primer layer 6 is applied and formed on a base material 5. This may not be necessary. Next, a coating film 3 is formed from a transparent conductive coating film as in (b), and finally a top coat 2 is applied to protect the transparent conductive coating film in (c).
このトップコート内の溶剤により基材ＰＶＣ５内の可塑
剤が透明導電性塗膜内ヘマイグレーションし、表面抵抗
が増大して所定の帯電防止機能を奏しなくなるものであ
る。The solvent in the top coat causes the plasticizer in the PVC base material to migrate into the transparent conductive coating film, increasing the surface resistance and making it impossible to perform the desired antistatic function.
実施例１
導電性コーティング剤の調製
ポリエステル樹脂（商品名バイロン２００、東洋紡株式
会社製）５０部、導電性粉末（酸化スズ商品名ニー１、
三菱金属社製）１５０部、メチルエチルケトン４００部
、トルエン４００部をサンドミルで３０分間分散処理し
、コーティング剤を調製した。Example 1 Preparation of conductive coating agent 50 parts of polyester resin (trade name Vylon 200, manufactured by Toyobo Co., Ltd.), conductive powder (tin oxide trade name Ni 1,
(manufactured by Mitsubishi Metals), 400 parts of methyl ethyl ketone, and 400 parts of toluene were dispersed in a sand mill for 30 minutes to prepare a coating agent.
転写部材の形成
まず、離型紙上にトップコート剤として無黄変型ポリウ
レタン樹脂溶液（商品名ハニタン６０１、ハニー化成社
製）を塗布し、製膜して５０℃で１分乾燥した後、その
上に更に前記で調整した導電性コーティング剤を塗布し
、同様に製膜して５０℃１分乾燥した。Formation of the transfer member First, a non-yellowing polyurethane resin solution (trade name Hanitan 601, manufactured by Honey Kasei Co., Ltd.) is applied as a top coat agent onto the release paper, a film is formed and dried at 50°C for 1 minute, and then Further, the conductive coating agent prepared above was applied, and a film was formed in the same manner and dried at 50° C. for 1 minute.
転写
次いで、表面にあらかじめ、膜厚３０μｍの粘着剤（商
品名ＰＥ−１１７日本カーバイト社製）をコーティング
しである基材可塑化軟質ポリ塩化ビニルシート（ＰＶＣ
／可塑剤＝１００／６０：可塑剤はジオチルフタレート
／トリウレジルファレート＝５０１５０よりなる）上に
転写し、導電性を付与した可塑化軟質ポリ塩化ビニルシ
ートを作成した。Transfer Next, the base material was a plasticized soft polyvinyl chloride sheet (PVC) whose surface was coated with an adhesive (trade name: PE-117 manufactured by Nippon Carbide Co., Ltd.) with a film thickness of 30 μm in advance.
/Plasticizer=100/60: Plasticizer consists of diothyl phthalate/triuresyl phalate=50150) to prepare a plasticized flexible polyvinyl chloride sheet imparted with conductivity.
その表面固有抵抗値、耐摩擦性経口固有抵抗の性能評価
結果を第１表に示す。Table 1 shows the performance evaluation results of the surface resistivity value and oral resistivity of friction resistance.
以 下 余 白
実施例２〜４
実施例１の方法において、トップコート剤の塗布ｍを第
１表に示すよう変量する以外はすべて同じ方法を行ない
、導電性を付与した可塑化軟質ポリ塩化ビニルシートを
えた。The following margin Examples 2 to 4 The same method as in Example 1 was carried out except that the application m of the top coat agent was varied as shown in Table 1, and plasticized soft polyvinyl chloride imparted with conductivity was prepared. I got a sheet.
実施例５〜８
実施例１の方法において、トップコート剤の塗布口を１
．４ｇ／ｍと固定し、導電性コーティング剤の塗布口を
第１表に示すよう変量する以外はすべて同じ方法を行な
い、導電性を付与した可塑化軟質ポリ塩化ビニルシート
をえた。Examples 5 to 8 In the method of Example 1, the application port of the top coat agent was
．． A plasticized flexible polyvinyl chloride sheet imparted with conductivity was obtained by carrying out the same method except that the conductive coating agent was fixed at 4 g/m and the application port of the conductive coating agent was varied as shown in Table 1.
実施例９〜１０
実施例１の方法において、トップコート剤を第１表に示
すよう内容及び塗布量を変える以外はすべて同じ方法を
行ない、導電性を付与した可塑化軟質ポリ塩化ビニルシ
ートをえた。Examples 9 to 10 A plasticized flexible polyvinyl chloride sheet imparted with conductivity was obtained by carrying out the same method as in Example 1 except for changing the content and coating amount of the top coat agent as shown in Table 1. .
比較例１
軟質ＰｖＣシート上に、実施例１の導電性コーティング
剤を乾燥塗布ｍｌ ２９／ＴＩＬとなるように塗布した
後、ハニタン６０１を同様に１．１ｇ、／コとなるよう
に塗布し、乾燥した。Comparative Example 1 On a soft PvC sheet, the conductive coating agent of Example 1 was applied to a dry coating ml of 29/TIL, and then Hanitan 601 was applied in the same manner to an amount of 1.1 g/TIL. Dry.
（発明の効果）
本発明は、以上に説明したように構成されているため、
従来技術にみられた導電率の低下が防止され、常に所定
の帯電防止機能を備えた製品を提供できるという効果が
秦される。(Effect of the invention) Since the present invention is configured as described above,
The present invention has the advantage that the decrease in conductivity seen in the prior art is prevented, and products that always have a predetermined antistatic function can be provided.
、本
第１図（イ）〜（ｇ！ｉ）は本発明の製造過程の説明図
であり、第２図（イ）〜（ハ）は従来技術の説明図であ
る。, FIGS. 1(a) to (g!i) are explanatory diagrams of the manufacturing process of the present invention, and FIGS. 2(a) to (c) are explanatory diagrams of the prior art.
Claims (6)
剤層と、該層上に、離型紙表面に順次トップコート層、
透明導電性コート層よりなる複合転写層を転写形成して
なる、透明導電性層を有する可塑化軟質合成樹脂製品。(1) An adhesive layer provided on the surface of the plasticized soft synthetic resin that is the base material, a top coat layer on the surface of the release paper,
A plasticized soft synthetic resin product having a transparent conductive layer formed by transferring and forming a composite transfer layer consisting of a transparent conductive coat layer.
る請求項１に記載の透明導電性層を有する可塑化軟質合
成樹脂製品。(2) The plasticized soft synthetic resin product having a transparent conductive layer according to claim 1, wherein the plasticized soft synthetic resin is a polyvinyl chloride resin.
透明導電性コート層を積層してなる、可塑化軟質合成樹
脂表面に導電性層を形成するための転写部材。(3) release paper and a top coat layer on its surface,
A transfer member for forming a conductive layer on the surface of a plasticized soft synthetic resin, which is formed by laminating a transparent conductive coat layer.
材。(4) The transfer member according to claim 3, wherein an adhesive layer is provided as the uppermost layer.
れた可塑化軟質合成樹脂製品。(5) A plasticized soft synthetic resin product having a transparent conductive layer formed on its surface using the transfer member according to claim 4.
請求項５に記載の表面に透明導電性層が形成された可塑
化軟質合成樹脂製品。(6) The plasticized soft synthetic resin product having a transparent conductive layer formed on the surface according to claim 5, wherein the plasticized soft synthetic resin is a polyvinyl chloride resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1028607A JP2519528B2 (en) | 1989-02-09 | 1989-02-09 | Plasticized soft synthetic resin product having transparent conductive layer and transfer member for forming transparent conductive layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1028607A JP2519528B2 (en) | 1989-02-09 | 1989-02-09 | Plasticized soft synthetic resin product having transparent conductive layer and transfer member for forming transparent conductive layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02208024A true JPH02208024A (en) | 1990-08-17 |
| JP2519528B2 JP2519528B2 (en) | 1996-07-31 |
Family
ID=12253263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1028607A Expired - Fee Related JP2519528B2 (en) | 1989-02-09 | 1989-02-09 | Plasticized soft synthetic resin product having transparent conductive layer and transfer member for forming transparent conductive layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2519528B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097157A (en) * | 2010-11-23 | 2011-06-15 | 苏州禾盛新型材料股份有限公司 | Back adhesive type transparent conducting film |
| JP2012203091A (en) * | 2011-03-24 | 2012-10-22 | Sony Corp | Conductive element and method of manufacturing the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5570900B2 (en) * | 2010-07-26 | 2014-08-13 | 東京エレクトロン株式会社 | Method for forming resin protrusion layer on substrate mounting surface and resin protrusion layer transfer member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5949967A (en) * | 1982-09-16 | 1984-03-22 | 三菱化学株式会社 | transparent conductive film |
| JPS627112U (en) * | 1985-06-28 | 1987-01-16 |
-
1989
- 1989-02-09 JP JP1028607A patent/JP2519528B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5949967A (en) * | 1982-09-16 | 1984-03-22 | 三菱化学株式会社 | transparent conductive film |
| JPS627112U (en) * | 1985-06-28 | 1987-01-16 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097157A (en) * | 2010-11-23 | 2011-06-15 | 苏州禾盛新型材料股份有限公司 | Back adhesive type transparent conducting film |
| JP2012203091A (en) * | 2011-03-24 | 2012-10-22 | Sony Corp | Conductive element and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2519528B2 (en) | 1996-07-31 |
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| LAPS | Cancellation because of no payment of annual fees |