JPH0361712B2 - - Google Patents
Info
- Publication number
- JPH0361712B2 JPH0361712B2 JP60022685A JP2268585A JPH0361712B2 JP H0361712 B2 JPH0361712 B2 JP H0361712B2 JP 60022685 A JP60022685 A JP 60022685A JP 2268585 A JP2268585 A JP 2268585A JP H0361712 B2 JPH0361712 B2 JP H0361712B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- sensitive adhesive
- foam
- adhesive layer
- unfoamed
- 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.)
- Expired - Lifetime
Links
- 239000012790 adhesive layer Substances 0.000 claims description 23
- 229920006037 cross link polymer Polymers 0.000 claims description 23
- 239000006260 foam Substances 0.000 claims description 21
- 239000000853 adhesive Substances 0.000 claims description 15
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 12
- 239000002313 adhesive film Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 229920000642 polymer Polymers 0.000 description 5
- 239000004604 Blowing Agent Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920001169 thermoplastic Polymers 0.000 description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 description 3
- 239000004703 cross-linked polyethylene Substances 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 239000004156 Azodicarbonamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 2
- 235000019399 azodicarbonamide Nutrition 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000002655 kraft paper Substances 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- MWRWFPQBGSZWNV-UHFFFAOYSA-N Dinitrosopentamethylenetetramine Chemical compound C1N2CN(N=O)CN1CN(N=O)C2 MWRWFPQBGSZWNV-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 206010057040 Temperature intolerance Diseases 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical class NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920006226 ethylene-acrylic acid Polymers 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 230000008543 heat sensitivity Effects 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- 239000002184 metal Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000002832 nitroso derivatives Chemical class 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 description 1
- 239000003707 silyl modified polymer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Landscapes
- Adhesive Tapes (AREA)
- Laminated Bodies (AREA)
Description
本発明は接着層を有する発泡体の製造方法に関
する。
The present invention relates to a method for producing a foam having an adhesive layer.
近年、クツシヨン材、防振材、あるいはシール
材として、ゴム、プラスチツクなどのポリマーの
発泡体が各種分野に使用されており、施工の容易
さ等の点でこれらの発泡体シートの片面あるいは
両面に感熱性接着剤の層を設た構造の加熱接着性
シートが多用されている。
しかしながら、従来の加熱性接着性シートは、
発泡剤みのポリマーシートの表面に感熱性接着剤
のフイルムを加熱ラミネートあるいは押出によつ
て貼着するため、20μm以下の均一な厚さの感熱
性接着剤層とすることが難しかつた。
又、接着層を薄膜にすべく、グラビアコートし
ようとすれば複雑な装置を必要とするし、接着剤
層をラミネートするためにプライマー処理を多く
の場合必要となり、工程が複雑になるとともに、
プライマー使用のコストも負担となつていた。
更に、製法上の制約から融点が比較的低い感熱
性接着剤が用いられる場合、得られる発泡シート
を積み重ねて保管、運搬すると、ブロツキングが
生じやすいという問題があつた。特に、赤道を通
過する船舶内で、温度が70℃以上の高温に達し、
発泡シート同志のブロツキングが多発したという
状況もあつた。
In recent years, polymer foams such as rubber and plastic have been used in various fields as cushioning materials, vibration-proofing materials, or sealing materials. Heat-adhesive sheets with a layer of heat-sensitive adhesive are often used. However, conventional heatable adhesive sheets
Since a heat-sensitive adhesive film is attached to the surface of a foaming agent-containing polymer sheet by heat lamination or extrusion, it is difficult to form a heat-sensitive adhesive layer with a uniform thickness of 20 μm or less. Furthermore, if gravure coating is used to make the adhesive layer thin, complicated equipment is required, and primer treatment is often required to laminate the adhesive layer, which complicates the process.
The cost of using primers was also a burden. Furthermore, when a heat-sensitive adhesive having a relatively low melting point is used due to restrictions in the manufacturing process, there is a problem that blocking tends to occur when the resulting foamed sheets are stored and transported in a stacked manner. In particular, the temperature inside a ship passing through the equator reaches high temperatures of 70℃ or more.
There was also a situation where foam sheets frequently blotted together.
本発明は、これらの問題点を解決するためにな
されたもので、均一な薄膜の感熱接着層を有する
発泡体を製造することができ、しかも複雑な装置
か工程を必要とせず、良好な感熱接着層とするこ
とにより保管、運搬時にブロツキングを生じるこ
とのない接着層を有する発泡体を得ることのでき
る製造方法を提供することを目的とする。
The present invention was made to solve these problems, and it is possible to produce a foam having a uniform thin heat-sensitive adhesive layer, without requiring complicated equipment or processes, and with good heat-sensitivity. The object of the present invention is to provide a manufacturing method capable of obtaining a foam having an adhesive layer that does not cause blocking during storage and transportation.
本発明方法は、未発泡架橋ポリマーシートの少
なくとも片面に感熱性接着剤からなる層を形成せ
しめ、未発泡架橋ポリマーシートを加熱し少なく
とも二次元方向に発泡膨張せしめることを特徴と
する。
更に、好適には上記方法において感熱性接着剤
のフイルムが押出されながら未発泡架橋ポリマー
シートに連続的に貼り合わされるすることができ
る。
本発明方法により得られる接着層を有する発泡
体は、一例として図面に示される。図において符
号１は架橋ポリマー発泡体であり、この片面（場
合により両面）に薄膜状の感熱接着層２が形成さ
れている。
本発明における、未発泡架橋ポリマーシート
は、例えば熱可塑性ポリマーに発泡剤を所定の量
配合し、更に必要に応じて充填剤、老化防止剤、
着色剤等を添加し、ミキシングロールまたは押出
機により混練し、発泡剤が実質的に分解発泡しな
い条件でシート状に成形される。
このシートに、続いて電子線等の放射線を照射
して架橋することにより、未発泡架橋ポリマーシ
ートが得られる。
又、熱可塑性ポリマーに発泡剤とともに、過酸
化物のような架橋剤を配合し、この混合物をシー
ト成形時に、あるいはシート成形後の加熱により
架橋させてもよく、あるいは熱可塑性ポリマーと
してシラン変性ポリマーを使用し、シラノール縮
合触媒の存在下で架橋させて、未発泡架橋ポリマ
ーシートとすることもできる。
未発泡架橋ポリマーシートの成形に使用される
熱可塑性ポリマーとしては、ポリエチレン、ポリ
プロピレンのようなポリオレフイン系樹脂の他、
ポリスチレン、ポリ塩化ビニル、ブチルゴム等が
ある。
また、発泡剤としては、アゾジカルボンアミ
ド、アゾビスイソブチルニトリルのようなアゾ化
合物や、ジニトロソペンタメチレンテトラミンの
ようなニトロソ化合物等がある。これらの中で使
用するポリマーの軟化点以上の温度で分解し、シ
ート成形時に発泡しないものを選び、単独あるい
は混合して、場合により尿素、カルボン酸の金属
塩のような発泡助剤と共に用いることが好まし
い。
このようにして得られる未発泡架橋ポリマーシ
ートは、通常厚さ0.05〜５mm、好ましくは0.1〜
３mm程度とする。
接着層を形成するため、未発泡架橋ポリマーシ
ートの少なくとも片面に設けられる層を構成する
感熱性接着剤としては、エチレン−酢酸ビニル共
重合体、エチレン−アクリル酸アイオノマー、エ
チレン−アクリル酸エチル共重合体等が挙げら
れ、これらの中で適当な軟化温度（融点）を有す
るポリマーを選んで使用する。
これらの感熱性接着剤からなる層を、未発泡架
橋ポリマーシートに積層するには、予め得られた
感熱性接着剤フイルムを加熱しながら未発泡架橋
ポリマーシートに貼り合わせる加熱ラミネート
法、感熱接着剤を押出機によりフイルム状に押出
しながら未発泡架橋ポリマーシート上に供給し連
続的に貼り合わせる押出ラミネート法、又は他の
従来公知の方法を使用できる。
このようにして、感熱性接着剤からなる層が形
成された未発泡架橋ポリマーシートは、多くの場
合加熱オーブン（加熱発泡炉）を通過させ、発泡
剤の働きにより発泡させる。そして典型的には、
シートは自由な状態で数倍〜数十倍に発泡して、
三次元方向に膨張する。
必要により、厚み方向を規制するなどして、実
質的に二次元方向に発泡膨張させることもある。
The method of the present invention is characterized in that a layer made of a heat-sensitive adhesive is formed on at least one side of an unfoamed crosslinked polymer sheet, and the unfoamed crosslinked polymer sheet is heated to expand and expand in at least two dimensions. Furthermore, preferably in the above method, the film of the heat-sensitive adhesive can be continuously bonded to the unfoamed crosslinked polymer sheet while being extruded. A foam with an adhesive layer obtained by the method of the invention is shown in the drawing by way of example. In the figure, reference numeral 1 indicates a crosslinked polymer foam, and a thin film-like heat-sensitive adhesive layer 2 is formed on one side (on both sides in some cases) of the crosslinked polymer foam. In the present invention, the unfoamed crosslinked polymer sheet is prepared by blending a predetermined amount of a blowing agent into a thermoplastic polymer, and further adding fillers, anti-aging agents, etc. as necessary.
A coloring agent and the like are added, kneaded using a mixing roll or an extruder, and formed into a sheet under conditions such that the blowing agent does not substantially decompose and foam. This sheet is subsequently crosslinked by irradiation with radiation such as an electron beam, thereby obtaining an unfoamed crosslinked polymer sheet. Alternatively, a crosslinking agent such as a peroxide may be blended with a thermoplastic polymer along with a blowing agent, and this mixture may be crosslinked during sheet molding or by heating after sheet molding, or a silane-modified polymer may be used as the thermoplastic polymer. An unfoamed crosslinked polymer sheet can also be obtained by crosslinking in the presence of a silanol condensation catalyst. Thermoplastic polymers used for forming unfoamed crosslinked polymer sheets include polyolefin resins such as polyethylene and polypropylene, as well as polyolefin resins such as polyethylene and polypropylene.
Examples include polystyrene, polyvinyl chloride, butyl rubber, etc. Examples of the blowing agent include azo compounds such as azodicarbonamide and azobisisobutylnitrile, and nitroso compounds such as dinitrosopentamethylenetetramine. Among these, select one that decomposes at a temperature higher than the softening point of the polymer used and does not foam during sheet molding, and use it alone or in combination, optionally with a foaming aid such as urea or a metal salt of carboxylic acid. is preferred. The unfoamed crosslinked polymer sheet obtained in this way usually has a thickness of 0.05 to 5 mm, preferably 0.1 to 5 mm.
It should be about 3mm. The heat-sensitive adhesive constituting the layer provided on at least one side of the unfoamed crosslinked polymer sheet to form the adhesive layer includes ethylene-vinyl acetate copolymer, ethylene-acrylic acid ionomer, and ethylene-ethyl acrylate copolymer. Among them, a polymer having an appropriate softening temperature (melting point) is selected and used. In order to laminate a layer made of these heat-sensitive adhesives onto an unfoamed cross-linked polymer sheet, a heat-sensitive adhesive film can be laminated onto an un-foamed cross-linked polymer sheet while heating a previously obtained heat-sensitive adhesive film, or a heat-sensitive adhesive film can be laminated onto the unfoamed cross-linked polymer sheet. An extrusion lamination method, in which the material is extruded into a film by an extruder while being fed onto an unfoamed crosslinked polymer sheet and continuously laminated, or other conventionally known methods can be used. The unfoamed crosslinked polymer sheet on which the layer of heat-sensitive adhesive has been formed in this way is often passed through a heating oven (thermal foaming furnace) and foamed by the action of a foaming agent. And typically,
The sheet expands several times to several tens of times in its free state,
Expands in three dimensions. If necessary, the foam may be expanded substantially in two dimensions by regulating the thickness direction.
上記発明方法により、図示するような感熱性接
着剤層を有する発泡体が得られるが、未発泡架橋
ポリマーシートの状態で感熱性接着剤からなる層
が形成され、少なくとも二次元方向に発泡膨張さ
れるから、結果的に接着層は極めて薄膜に伸ばさ
れ、厚さ20μm以下の均一な感熱性接着層等も容
易に得られる。
By the method of the invention described above, a foam having a heat-sensitive adhesive layer as shown in the figure can be obtained, but the layer consisting of the heat-sensitive adhesive is formed in the state of an unfoamed crosslinked polymer sheet, and is expanded and expanded in at least two dimensions. As a result, the adhesive layer can be stretched into an extremely thin film, and a uniform heat-sensitive adhesive layer with a thickness of 20 μm or less can be easily obtained.
以下、一実施例について記載する。
アゾジカルボンアミドを含有し、電子線照射に
より架橋された厚さ1.7mmの未発泡架橋ポリエチ
レンシートの片面に、厚さ50μmの感熱性接着剤
フイルム（ヒロダイン工業社製＃7550、M138軟
化温度116℃）を連続的に供給し、ヒータにより
加熱して貼り合わせた後、これを220℃のオーブ
ンに３分間入れて加熱し架橋ポリエチレンシート
を倍30倍、厚さ４mmに発泡膨張させた。得られた
発泡体の片面には、約厚さ4μmに伸ばされた均一
な接着層が形成されていた。
得られた、接着層を有する発泡体１の感熱性接
着層２を内側にしてクラフト紙に重ね、110℃の
温度で加熱しながらプレスに挾み、0.5Kg／m2の
圧力を掛けた。
この後、常温まで冷却してから、接着部を剥が
そうとしたが、クラフト紙に接着した状態で発泡
体が破断してしまい、接着部はそのままであつ
た。
An example will be described below. On one side of a 1.7 mm thick unfoamed crosslinked polyethylene sheet containing azodicarbonamide and crosslinked by electron beam irradiation, a 50 μm thick heat-sensitive adhesive film (#7550 manufactured by Hirodyne Industries, M138, softening temperature 116°C) was applied. ) was continuously supplied and bonded together by heating with a heater, and then placed in an oven at 220° C. for 3 minutes to heat the crosslinked polyethylene sheet and expand the crosslinked polyethylene sheet by 30 times and to a thickness of 4 mm. A uniform adhesive layer stretched to a thickness of about 4 μm was formed on one side of the obtained foam. The obtained foam 1 having an adhesive layer was stacked on kraft paper with the heat-sensitive adhesive layer 2 on the inside, and was placed in a press while heating at 110° C., and a pressure of 0.5 kg/m 2 was applied. Thereafter, after cooling to room temperature, an attempt was made to peel off the adhesive part, but the foam broke while being adhered to the kraft paper, and the adhesive part remained as it was.
以上詳述したように、本発明方法によれば、薄
膜の均一な感熱性接着層が形成された発泡体が容
易に得られる。
即ち、未発泡架橋ポリマーシートの状態で、感
熱性接着剤からなる層が形成されるから、少なく
とも二次元方向に発泡した後は、接着剤の層が発
泡倍率に応じて表面積として10倍前後は容易に伸
ばされるから、極めて薄い感熱性接着層が形成さ
れるのである。
従つて、入手し易い、あるいは成形し易いある
程度厚みを持つた感熱性接着剤フイルム（上記実
施例では50μm）を使用することができるから、
全体の成形が容易になり、材料の選択範囲も拡が
ることになる。
又、材料の制約がなくなること、薄膜に伸ばさ
れることは、感熱性接着剤フイルムとして、接着
性、耐ブロツキング性等に優れた、ある程度コス
ト高の材料を選ぶことができ、加工性、作業性に
優れた接着層を有する発泡体を需要者に提供でき
る。
尚、本発明方法において、感熱性接着剤のフイ
ルムが押出されながら未発泡架橋ポリマーシート
に連続的に貼り合わされる工程にすると、接着剤
フイルムの成形後の加熱が不要か楽になり、未発
泡架橋ポリマーシートの間にゴミが混入すること
も防止し易い。
As described in detail above, according to the method of the present invention, a foam on which a thin and uniform heat-sensitive adhesive layer is formed can be easily obtained. That is, since a layer consisting of a heat-sensitive adhesive is formed in the state of an unfoamed crosslinked polymer sheet, at least after foaming in two dimensions, the surface area of the adhesive layer is approximately 10 times larger depending on the expansion ratio. Because it is easily stretched, an extremely thin heat-sensitive adhesive layer is formed. Therefore, it is possible to use a heat-sensitive adhesive film with a certain thickness (50 μm in the above example) that is easily available or moldable.
The overall molding becomes easier and the range of materials available for selection is expanded. In addition, the fact that there are no restrictions on the material and that it can be stretched into a thin film means that as a heat-sensitive adhesive film, it is possible to select a somewhat expensive material with excellent adhesiveness and anti-blocking properties, which improves processability and workability. It is possible to provide users with a foam having an excellent adhesive layer. In addition, in the method of the present invention, if the process is such that the heat-sensitive adhesive film is continuously bonded to the unfoamed crosslinked polymer sheet while being extruded, heating after molding the adhesive film is unnecessary or easy, and the unfoamed crosslinked polymer sheet is extruded. It is also easy to prevent dust from getting mixed in between the polymer sheets.
図面は、本発明方法により得られた、接着層を
有する発泡体の一例を示す断面図である。
１……発泡体、２……接着層。
The drawing is a sectional view showing an example of a foam having an adhesive layer obtained by the method of the present invention. 1... Foam, 2... Adhesive layer.
Claims (1)
に感熱性接着剤からなる層を形成せしめ、未発泡
架橋ポリマーシートを加熱し少なくとも二次元方
向に発泡膨張せしめることを特徴とする接着層を
有する発泡体の製造方法。 ２ 感熱性接着剤からなるフイルムが押出されな
がら未発泡架橋ポリマーシートに連続的に貼り合
わされる特許請求の範囲第１項記載の接着層を有
する発泡体の製造方法。[Scope of Claims] 1. An adhesive layer characterized by forming a layer made of a heat-sensitive adhesive on at least one side of an unfoamed crosslinked polymer sheet, and heating the unfoamed crosslinked polymer sheet to expand it in at least two dimensions. A method for producing a foam having the following. 2. The method for producing a foam having an adhesive layer according to claim 1, wherein a film made of a heat-sensitive adhesive is continuously bonded to an unfoamed crosslinked polymer sheet while being extruded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2268585A JPS61181885A (en) | 1985-02-06 | 1985-02-06 | Foamable heat-bondable sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2268585A JPS61181885A (en) | 1985-02-06 | 1985-02-06 | Foamable heat-bondable sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61181885A JPS61181885A (en) | 1986-08-14 |
| JPH0361712B2 true JPH0361712B2 (en) | 1991-09-20 |
Family
ID=12089720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2268585A Granted JPS61181885A (en) | 1985-02-06 | 1985-02-06 | Foamable heat-bondable sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61181885A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62198242U (en) * | 1986-06-10 | 1987-12-17 | ||
| JPH03229779A (en) * | 1990-02-05 | 1991-10-11 | Sekisui Chem Co Ltd | Foamed heat-bondable sheet |
| JP6093698B2 (en) * | 2011-06-01 | 2017-03-08 | 八商商事株式会社 | Method for manufacturing slip prevention tool and slip prevention tool |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5329752A (en) * | 1976-08-31 | 1978-03-20 | Mitsubishi Rayon Co | Method of adjusting color distribution |
-
1985
- 1985-02-06 JP JP2268585A patent/JPS61181885A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5329752A (en) * | 1976-08-31 | 1978-03-20 | Mitsubishi Rayon Co | Method of adjusting color distribution |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61181885A (en) | 1986-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |