JPH0416494B2 - - Google Patents
Info
- Publication number
- JPH0416494B2 JPH0416494B2 JP61169302A JP16930286A JPH0416494B2 JP H0416494 B2 JPH0416494 B2 JP H0416494B2 JP 61169302 A JP61169302 A JP 61169302A JP 16930286 A JP16930286 A JP 16930286A JP H0416494 B2 JPH0416494 B2 JP H0416494B2
- Authority
- JP
- Japan
- Prior art keywords
- thin film
- polyvinyl chloride
- vinyl acetate
- treated
- releasable
- 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
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 23
- 239000004800 polyvinyl chloride Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 18
- 239000010409 thin film Substances 0.000 claims description 18
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 13
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002390 adhesive tape Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 claims description 5
- 239000003522 acrylic cement Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 description 14
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- -1 alkyl isocyanate Chemical class 0.000 description 8
- 239000012948 isocyanate Substances 0.000 description 7
- 229920002554 vinyl polymer Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- QWDQYHPOSSHSAW-UHFFFAOYSA-N 1-isocyanatooctadecane Chemical compound CCCCCCCCCCCCCCCCCCN=C=O QWDQYHPOSSHSAW-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
Description
産業上の利用分野
本発明は、エチレン−酢酸ビニル共重合体系剥
離性処理剤で処理されてなり、表面保護材や粘着
テープにおける基材あるいは剥離テープなどとし
て好適なポリ塩化ビニルの薄葉体に関する。
従来の技術及び問題点
従来、ステンレス板等の保護を目的とした表面
保護材や粘着テープにおける基材、あるいは剥離
テープなどとして、シリコーン系又はポリビニル
アルコール−長鎖アルキルイソシアネート系の剥
離性処理剤で処理されてなるポリ塩化ビニルの薄
葉体が知られていた。
しかしながら、これらの剥離性処理剤で処理さ
れたポリ塩化ビニルの薄葉体にあつては、その剥
離性処理膜がポリ塩化ビニルに対する接着性に劣
つて脱落しやすく、例えば表面保護材の巻取り物
を巻戻す際などのように剥離性処理面に貼着した
粘着剤層を引剥がす際に、剥離性処理膜がポリ塩
化ビニル側より粘着剤側に転写される問題点があ
つた。剥離性処理膜の粘着剤側への転写は、粘着
剤面の接着力を低下させる原因となる。加えて、
表面保護材の場合には転写物の残存で被着体が汚
染されることとなり、その除去工程が必要になつ
て作業効率を低下せしめることとなる。そのた
め、剥離性処理剤の使用量をできるだけ少なくし
て汚染の防止をはかつている実状であるが、満足
できる解決策とはなつていない。
問題点を解決するための手段
本発明者らは、上記の転写現象としての脱落問
題を克服し、剥離性処理膜を実用上満足できる接
着状態で有するポリ塩化ビニルの薄葉体を開発す
るために鋭意研究を重ねた結果、エチレン−酢酸
ビニル共重合樹脂に他種の剥離性処理剤を配合し
てなる剥離性処理剤を用いることによりその目的
を達成しうることを見出し、本発明をなすに至つ
た。
すなわち本発明は、エチレン−酢酸ビニル共重
合樹脂に他種の剥離性処理剤を配合してなる剥離
性処理剤で処理されてなることを特徴とするポリ
塩化ビニルの薄葉体を提供するものである。
本発明において用いられる剥離性処理剤は、エ
チレン−酢酸ビニル共重合樹脂に他種の剥離性処
理剤を配合したものである。
エチレン−酢酸ビニル共重合樹脂としては、酢
酸ビニル含量12〜65重量％、メルトインデツクス
１〜50ｇ／10分のものが適当である。酢酸ビニル
含量が12重量％未満であるとポリ塩化ビニルの薄
葉体に対する接着力が不充分で、剥離性処理膜の
脱落を伴う場合があり、65重量％を超えると剥離
性が不充分となる。また、酢酸ビニル含量が前記
範囲外であると得られる剥離性処理膜がポリ塩化
ビニル、殊に軟質ポリ塩化ビニルの薄葉体の伸び
（通常、３〜10％）に対する追随性にに劣り、こ
れがため脱落する場合がある。なお、軟質ポリ塩
化ビニルの薄葉体に対しては酢酸ビニル含量が多
いほど接着力に優れるものとすることができる。
一方、メルトインデツクスが前記範囲外のものは
塗工性あるいは形成される剥離性処理膜の強度な
どの点で好ましくない。
エチレン−酢酸ビニル共重合樹脂に配合される
他種の剥離性処理剤としては、ポリビニルアルコ
ール−長鎖アルキルイソシアネート系のものなど
をあげることができる。これは、例えばポリビニ
ルアルコールと長鎖アルキルイソシアネートとの
反応生成物をケン化する方法（特願昭60−第
227243号）などで得ることができる。剥離性の向
上を目的とする場合における他種の剥離性処理剤
の配合量は、エチレン−酢酸ビニル共重合樹脂
100重量部あたり５〜30重量部が適当である。そ
の配合量が５重量部未満であると配合効果（剥離
性の向上）に乏しいし、30重量部を超えると他種
の剥離性処理剤に対するエチレン−酢酸ビニル共
重合樹脂のバインダー作用が相対的に低下してポ
リ塩化ビニルの薄葉体に対する接着力が低下し、
主に他種の剥離性処理剤の脱落現象がみられるよ
うになる。従つて、表面保護材の場合には被着体
の汚染を惹起する。
本発明においてポリ塩化ビニルの薄葉体として
は、表面保護材、粘着テープあるいは剥離テープ
等における基材などとして適用されるものが用い
られる。一般には、厚さ５mm以下のテープ、フイ
ルムないしシートなどが用いられる。ポリ塩化ビ
ニルの薄葉体は、ポリ塩化ビニルのみからなるも
のであつてもよいし、例えばポリ塩化ビニルの薄
葉体のラミネート体のように積層体ないし複合体
などであつてもよい。なお、ポリ塩化ビニルの薄
葉体に設ける剥離性処理剤の層厚は通例であつて
よい。
本発明の剥離性処理されたポリ塩化ビニルの薄
葉体は、アクリル系粘着剤に対して優れた剥離性
を示すが、適用可能な粘着剤はこれに限定されな
い。
なお、本発明によるポリ塩化ビニルの薄葉体を
基材とする表面保護材や粘着テープは、かかる基
材に粘着剤層を設けたものであるが、その形成は
常法によつて行うことができる。
発明の効果
本発明のポリ塩化ビニルからなる薄葉体は、そ
の剥離性処理膜が粘着剤面に対しては弱い接着力
を示して優れた剥離性を示し、基材としてのポリ
塩化ビニルの薄葉体に対しては強い接着力を示し
て密着性に優れている。その結果、剥離性処理膜
の薄葉体からの脱落による粘着剤層への転写、ひ
いては粘着剤面の接着力の低下が有効に防止さ
れ、表面保護材の場合には被着体の汚染が有効に
防止される。
また、剥離性処理膜に文字等を書くことが可能
で良好な印字性を有している。
さらに、剥離性処理膜は摩擦係数が大きくて滑
りにくく、表面保護材とした場合にステンレス板
等の被着体の安定した重ね置きが可能でその保管
安全性に優れるなどの利点も有している。
実施例
酢酸ビニル含量45重量％、メルトインデツクス
40ｇ／10分のエチレン−酢酸ビニル共重合樹脂
100重量部に、ポリビニルアルコール−長鎖アル
キルイソシアネート系剥離性処理剤を20重量部配
合してなる剥離性処理剤（１重量％トルエン溶
液）を調製し、これを厚さ120μm、幅100mmのポ
リ塩化ビニルフイルムの片面に、固形分塗布量が
0.2ｇ／m2となるように均一塗布し、乾燥させて
剥離性処理テープを作製した。前記のポリビニル
アルコール−長鎖アルキルイソシアネート系剥離
性処理剤は、重合度1400、ケン化度88％のポリビ
ニルアルコール100重量部と、オクタデシルイソ
シアネート580重量部との反応生成物（水酸基含
量１％以下）からなるものである。
比較例 １
ポリビニルアルコール−長鎖アルキルイソシア
ネート系剥離性処理剤を配合しないで、エチレン
−酢酸ビニル共重合樹脂単独系の剥離性処理剤を
用いたほかは実施例１に準じて剥離性処理テープ
を作製した。
比較例 ２
ポリビニルアルコール−長鎖アルキルイソシア
ネート系剥離性処理剤を単独で使用したほかは実
施例１に準じて剥離性処理テープを作製した。
比較例 ３
付加型シリコーンエマルジヨンからなる剥離性
処理剤を用いたほかは実施例１に準じて剥離性処
理テープを作製した。
評価試験
実施例及び比較例で得た剥離性処理テープにつ
いて下記の試験を行つた。結果を表に示した。
［剥離力］
２Kgのローラを１往復させる方式で、アクリル
系粘着剤層を設けたポリエステル粘着テープ（No.
31B；日東電工社製）に試験片をその剥離性処理
面を介して貼着したのち、20℃下に24時間保持し
たものにつき180度ピール値（20℃、引張速度300
mm／分）を測定した。
［非脱落性］
20ｇ／cm2の荷重を負荷したフエルトを載せて10
往復させたのちの剥離性処理面につき上記と同様
にして剥離力を測定し、剥離力が増加した場合を
×、それ以外の場合を〇として評価した。
［印字性］
剥離性処理面に油性ボールペン及び水性ボール
ペンで文字を書き、その文字の鮮明さを目視で判
断して、判読が十分に可能である場合を〇、それ
以外の場合を×として評価した。
INDUSTRIAL APPLICATION FIELD The present invention relates to a polyvinyl chloride thin film treated with an ethylene-vinyl acetate copolymer release treatment agent and suitable as a surface protection material, a base material in an adhesive tape, a release tape, etc. Conventional technologies and problems Conventionally, silicone-based or polyvinyl alcohol-long chain alkyl isocyanate-based release agents have been used as surface protection materials for the purpose of protecting stainless steel plates, etc., as base materials for adhesive tapes, or as release tapes. Thin sheets of processed polyvinyl chloride have been known. However, in the case of polyvinyl chloride thin sheets treated with these releasable treatment agents, the releasable treated film has poor adhesion to the polyvinyl chloride and easily falls off, for example, when rolled up of surface protection material. When peeling off the adhesive layer stuck to the releasably treated surface, such as when unwinding, there was a problem that the releasably treated film was transferred from the polyvinyl chloride side to the adhesive side. Transfer of the releasable treated film to the pressure-sensitive adhesive side causes a decrease in the adhesive strength of the pressure-sensitive adhesive surface. In addition,
In the case of a surface protection material, the adherend will be contaminated by residual transfer material, and a removal step will be required, reducing work efficiency. Therefore, efforts are currently being made to prevent contamination by minimizing the amount of stripping treatment agent used, but this has not yet been a satisfactory solution. Means for Solving the Problems The present inventors aimed to overcome the above-mentioned problem of shedding as a transfer phenomenon and to develop a polyvinyl chloride thin film having a peelable treated film in a practically satisfactory adhesive state. As a result of extensive research, it was discovered that the object could be achieved by using a stripping agent made by blending an ethylene-vinyl acetate copolymer resin with other stripping agents. I've reached it. That is, the present invention provides a thin film of polyvinyl chloride, which is treated with a releasable treatment agent obtained by blending an ethylene-vinyl acetate copolymer resin with another type of releasable treatment agent. be. The releasable treatment agent used in the present invention is a mixture of ethylene-vinyl acetate copolymer resin and other releasable treatment agents. As the ethylene-vinyl acetate copolymer resin, one having a vinyl acetate content of 12 to 65% by weight and a melt index of 1 to 50 g/10 min is suitable. If the vinyl acetate content is less than 12% by weight, the adhesion of polyvinyl chloride to the thin film may be insufficient and the releasable treated film may fall off, and if it exceeds 65% by weight, the releasability will be insufficient. . In addition, if the vinyl acetate content is outside the above range, the releasable treated film obtained will have poor ability to follow the elongation (usually 3 to 10%) of thin sheets of polyvinyl chloride, especially soft polyvinyl chloride. It may fall off. Note that the higher the vinyl acetate content, the better the adhesive force can be for thin sheets of soft polyvinyl chloride.
On the other hand, a melt index outside the above range is unfavorable in terms of coating properties or the strength of the peelable treated film formed. Other types of releasable treatment agents to be added to the ethylene-vinyl acetate copolymer resin include those based on polyvinyl alcohol-long chain alkyl isocyanate. This is, for example, a method of saponifying the reaction product of polyvinyl alcohol and long-chain alkyl isocyanate (Japanese Patent Application No.
227243) etc. When the purpose is to improve the releasability, the amount of other releasability treatment agents is ethylene-vinyl acetate copolymer resin.
5 to 30 parts by weight per 100 parts by weight is suitable. If the blending amount is less than 5 parts by weight, the blending effect (improvement of release properties) will be poor, and if it exceeds 30 parts by weight, the binder effect of the ethylene-vinyl acetate copolymer resin will be relative to other types of release processing agents. The adhesive strength of polyvinyl chloride to the thin film material decreases.
Mainly, the phenomenon of detachment of other types of releasable treatment agents is observed. Therefore, in the case of a surface protection material, it causes contamination of the adherend. In the present invention, the polyvinyl chloride thin film used is one that is used as a base material for surface protection materials, adhesive tapes, release tapes, and the like. Generally, a tape, film, or sheet with a thickness of 5 mm or less is used. The polyvinyl chloride thin film may be composed only of polyvinyl chloride, or may be a laminate or a composite such as a laminate of polyvinyl chloride thin films. Note that the layer thickness of the releasable treatment agent provided on the polyvinyl chloride thin film body may be the usual thickness. Although the releasably treated polyvinyl chloride thin film of the present invention exhibits excellent releasability to acrylic adhesives, applicable adhesives are not limited thereto. Incidentally, the surface protection material and adhesive tape according to the present invention which have a thin film of polyvinyl chloride as a base material have an adhesive layer provided on such a base material, but the formation thereof can be carried out by a conventional method. can. Effects of the Invention The thin film made of polyvinyl chloride of the present invention has a releasable treated film that exhibits weak adhesion to the adhesive surface and exhibits excellent releasability. It exhibits strong adhesion to the body and has excellent adhesion. As a result, transfer to the adhesive layer due to detachment of the releasable treated film from the thin film body and a decrease in the adhesive strength of the adhesive surface are effectively prevented, and in the case of surface protection materials, contamination of the adherend is effectively prevented. is prevented. In addition, it is possible to write characters on the peelable treated film, and it has good printing properties. In addition, the removable treated film has a large coefficient of friction and is difficult to slip, and when used as a surface protection material, it has the advantage of allowing stable stacking of adherends such as stainless steel plates and providing excellent storage safety. There is. Example Vinyl acetate content 45% by weight, melt index
40g/10min ethylene-vinyl acetate copolymer resin
A stripping agent (1% by weight toluene solution) is prepared by mixing 100 parts by weight with 20 parts by weight of a polyvinyl alcohol-long chain alkyl isocyanate stripping agent, and this is applied to a polyethylene film with a thickness of 120 μm and a width of 100 mm. The amount of solids applied on one side of the vinyl chloride film is
A releasable treated tape was prepared by uniformly applying the coating to a concentration of 0.2 g/m 2 and drying it. The polyvinyl alcohol-long chain alkyl isocyanate stripping agent is a reaction product of 100 parts by weight of polyvinyl alcohol with a degree of polymerization of 1400 and a degree of saponification of 88% and 580 parts by weight of octadecyl isocyanate (hydroxyl group content of 1% or less). It consists of Comparative Example 1 A releasably treated tape was prepared in the same manner as in Example 1, except that a releasable agent based on ethylene-vinyl acetate copolymer resin alone was used instead of a polyvinyl alcohol-long-chain alkyl isocyanate-based releasable agent. Created. Comparative Example 2 A releasable treated tape was prepared in accordance with Example 1, except that a polyvinyl alcohol-long chain alkyl isocyanate-based releasable treatment agent was used alone. Comparative Example 3 A releasably treated tape was prepared in accordance with Example 1, except that a releasably treated agent consisting of an addition type silicone emulsion was used. Evaluation Test The following tests were conducted on the peelable treated tapes obtained in Examples and Comparative Examples. The results are shown in the table. [Peeling force] A polyester adhesive tape with an acrylic adhesive layer (No.
31B (manufactured by Nitto Denko Corporation) through its releasable treated surface and then held at 20℃ for 24 hours, the 180 degree peel value (20℃, tensile speed 300
mm/min) was measured. [Non-shedding] 10 times with felt loaded with a load of 20g/ cm2
After reciprocating, the peeling force was measured on the peelable treated surface in the same manner as above, and the case where the peeling force increased was evaluated as ×, and the other cases were evaluated as ○. [Printability] Write characters on the removable treated surface with an oil-based ballpoint pen or a water-based ballpoint pen, and visually judge the clarity of the characters. If the characters are sufficiently legible, rate them as 〇, otherwise, rate them as ×. did.
【表】
表より、エチレン−酢酸ビニル共重合樹脂に他
種の剥離性処理剤を併用したもので処理した本発
明に関わるポリ塩化ビニルからなる実施例の剥離
性処理テープは、小さい剥離力を示すとともに、
非脱落性と印字性の両方を有していることがわか
る。[Table] From the table, it can be seen that the release-treated tape of the example made of polyvinyl chloride according to the present invention, which was treated with an ethylene-vinyl acetate copolymer resin and other types of release treatment agents, had a small peeling force. In addition to showing,
It can be seen that it has both non-shedding properties and printability.
Claims (1)
離性処理剤を配合してなる剥離性処理剤で処理さ
れてなることを特徴とするポリ塩化ビニルの薄葉
体。 ２ エチレン−酢酸ビニル共重合樹脂における酢
酸ビニル含量が12〜65重量％である特許請求の範
囲第１項記載の薄葉体。 ３ ポリ塩化ビニルの薄葉体がこれに粘着剤層を
設けてなる表面保護材、粘着テープにおける基材
の状態にある特許請求の範囲第１項記載の薄葉
体。 ４ 粘着剤層がアクリル系粘着剤からなるもので
ある特許請求の範囲第３項記載の薄葉体。[Scope of Claims] 1. A thin film of polyvinyl chloride, characterized in that it is treated with a releasable treatment agent prepared by blending an ethylene-vinyl acetate copolymer resin with another type of releasable treatment agent. 2. The thin film body according to claim 1, wherein the vinyl acetate content in the ethylene-vinyl acetate copolymer resin is 12 to 65% by weight. 3. The thin film body according to claim 1, which is a thin film body of polyvinyl chloride provided with an adhesive layer thereon and serves as a base material in a surface protection material or adhesive tape. 4. The thin film body according to claim 3, wherein the adhesive layer is made of an acrylic adhesive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16930286A JPS6327538A (en) | 1986-07-18 | 1986-07-18 | Thin film of polyvinyl chloride subjected to releasing treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16930286A JPS6327538A (en) | 1986-07-18 | 1986-07-18 | Thin film of polyvinyl chloride subjected to releasing treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6327538A JPS6327538A (en) | 1988-02-05 |
| JPH0416494B2 true JPH0416494B2 (en) | 1992-03-24 |
Family
ID=15884008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16930286A Granted JPS6327538A (en) | 1986-07-18 | 1986-07-18 | Thin film of polyvinyl chloride subjected to releasing treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6327538A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4528391B2 (en) * | 1999-10-25 | 2010-08-18 | 日東電工株式会社 | Non-silicone peelable substrates and adhesive sheets |
| JP4845614B2 (en) * | 2006-07-06 | 2011-12-28 | 日東電工株式会社 | Release liner, adhesive tape and adhesive tape roll |
| JP6182379B2 (en) * | 2013-07-23 | 2017-08-16 | 日東電工株式会社 | Laminated film and adhesive tape |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS501152A (en) * | 1973-05-02 | 1975-01-08 | ||
| JPS5023057A (en) * | 1973-07-04 | 1975-03-12 | ||
| JPS593227A (en) * | 1982-06-28 | 1984-01-09 | Shimadzu Corp | Direct ratio photometric type spectrophotometer |
-
1986
- 1986-07-18 JP JP16930286A patent/JPS6327538A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS501152A (en) * | 1973-05-02 | 1975-01-08 | ||
| JPS5023057A (en) * | 1973-07-04 | 1975-03-12 | ||
| JPS593227A (en) * | 1982-06-28 | 1984-01-09 | Shimadzu Corp | Direct ratio photometric type spectrophotometer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6327538A (en) | 1988-02-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |