JPH06166859A - Production of acrylic pressure-sensitive adhesive - Google Patents
Production of acrylic pressure-sensitive adhesiveInfo
- Publication number
- JPH06166859A JPH06166859A JP4321679A JP32167992A JPH06166859A JP H06166859 A JPH06166859 A JP H06166859A JP 4321679 A JP4321679 A JP 4321679A JP 32167992 A JP32167992 A JP 32167992A JP H06166859 A JPH06166859 A JP H06166859A
- Authority
- JP
- Japan
- Prior art keywords
- polymerization
- monomer
- acrylic
- sensitive adhesive
- temperature
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/10—Esters
- C08F20/12—Esters of monohydric alcohols or phenols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/04—Polymerisation in solution
- C08F2/06—Organic solvent
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、アクリル酸エステル
系コポリマーを主成分とする粘着剤の製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a pressure-sensitive adhesive containing an acrylic ester copolymer as a main component.
【０００２】[0002]
【従来の技術】アクリル系粘着剤は、（メタ）アクリル
酸エステルモノマーを主体に、これと共重合し得る（メ
タ）アクリル酸、（メタ）アクリルアミド、酢酸ビニ
ル，スチレン等のモノマーを共重合して得たアクリル酸
エステル系コポリマーを主成分としているが、共重合後
に残存するアクリルモノマーにより不快臭が発生するの
で、残存アクリルモノマー量を極力少なくすることが要
望されている。2. Description of the Related Art An acrylic pressure-sensitive adhesive is mainly composed of a (meth) acrylic acid ester monomer and a copolymerizable monomer such as (meth) acrylic acid, (meth) acrylamide, vinyl acetate or styrene. Although the obtained acrylic acid ester-based copolymer is the main component, unpleasant odor is generated by the acrylic monomer remaining after the copolymerization, and therefore it is desired to reduce the residual acrylic monomer amount as much as possible.
【０００３】残存アクリルモノマーを減少させる方法と
しては、共重合時、重合触媒を増量したり、共重合の時
間を長くするなどして共重合を十分に行わせ、もって残
存アクリルモノマー量を減少させることがある。しか
し、重合触媒を増量するとそれだけコスト高となり、共
重合時間を長くすればそのまま重合時間が延長され、生
産性が低下するという問題がある。As a method of reducing the residual acrylic monomer, the amount of the residual acrylic monomer is reduced by increasing the amount of the polymerization catalyst during the copolymerization or prolonging the copolymerization time to sufficiently perform the copolymerization. Sometimes. However, if the amount of the polymerization catalyst is increased, the cost will increase accordingly, and if the copolymerization time is lengthened, the polymerization time will be extended and the productivity will be lowered.
【０００４】また、特開昭６３−１７５０８６号公報に
は、アクリレートモノマーを重合させて感圧アクリレー
トポリマー接着剤を製造するにあたり、アクリレートモ
ノマーの重合が実質的に完了した後、酢酸ビニル、ビニ
ルブチルエーテル、メチルアクリレートなどのスキャベ
ンジャーモノマーを残留モノマーと反応させることが提
案されている。Further, in JP-A-63-175086, in producing a pressure-sensitive acrylate polymer adhesive by polymerizing an acrylate monomer, vinyl acetate and vinyl butyl ether are prepared after the polymerization of the acrylate monomer is substantially completed. It has been proposed to react scavenger monomers such as, methyl acrylate with residual monomers.
【０００５】[0005]
【発明が解決しようとする課題】上記のスキャベンジャ
ーモノマーを残留モノマーと反応させる場合、温度など
の反応条件をアクリレートモノマーの重合条件とほぼ同
じにする必要があるため、アクリレートモノマーの重合
に引続いて同じ反応容器内で反応させている。このた
め、スキャベンジャーモノマーの反応が終了する迄、反
応容器を次の重合に供することができず、それだけ製造
時間が長くなっていた。When the above-mentioned scavenger monomer is reacted with the residual monomer, the reaction conditions such as temperature need to be almost the same as the polymerization conditions of the acrylate monomer. The same reaction vessel. Therefore, the reaction vessel cannot be used for the next polymerization until the reaction of the scavenger monomer is completed, and the production time is prolonged accordingly.
【０００６】この発明は、上記の点に鑑みてなされたも
のであり、アクリル系コポリマーの重合後、高温の反応
工程を必要とせずに、残存モノマーの少ないアクリル系
粘着剤を製造できる方法を提供することを目的とする。The present invention has been made in view of the above points, and provides a method for producing an acrylic pressure-sensitive adhesive containing a small amount of residual monomer after polymerization of an acrylic copolymer, without requiring a high-temperature reaction step. The purpose is to do.
【０００７】[0007]
【課題を解決するための手段】本願請求項１に記載の発
明のアクリル系粘着剤の製造方法は、（メタ）アクリル
酸エステルモノマーを主体とするモノマー組成を溶剤系
において重合開始剤の存在下で共重合させ、得られたア
クリル酸エステル系コポリマーを主成分としてアクリル
系粘着剤を製造する方法において、重合率９０％までの
重合前半では、１０時間半減期温度が、重合温度より１
０℃低い温度以上の重合開始剤を使用し、その後重合後
半で、１０時間半減期温度が、重合温度より１５℃以上
低い重合開始剤を使用することを特徴とする。The method for producing an acrylic pressure-sensitive adhesive of the present invention according to claim 1 of the present invention comprises a monomer composition mainly composed of a (meth) acrylic acid ester monomer in a solvent system in the presence of a polymerization initiator. In the method for producing an acrylic pressure-sensitive adhesive using the obtained acrylic acid ester-based copolymer as a main component, the 10-hour half-life temperature is 1% higher than the polymerization temperature in the first half of the polymerization up to a polymerization rate of 90%.
It is characterized in that a polymerization initiator having a temperature of 0 ° C. or lower is used, and then a polymerization initiator having a 10-hour half-life temperature lower than the polymerization temperature by 15 ° C. or more is used in the latter half of the polymerization.
【０００８】また請求項２記載の発明は、上記のアクリ
ル系粘着剤の製造方法において、重合開始時に酢酸ビニ
ルを添加することを特徴とする。The invention according to claim 2 is characterized in that, in the above-mentioned method for producing an acrylic pressure-sensitive adhesive, vinyl acetate is added at the start of polymerization.
【０００９】更に、請求項３記載の発明は、（メタ）ア
クリル酸エステルモノマーを主体とするモノマー組成を
溶剤系において重合開始剤の存在下で共重合させ、アク
リル系粘着剤を製造するにあたり、共重合終了後、該ア
クリル系粘着剤溶液にモルホリンを添加することを特徴
とする。Further, in the invention described in claim 3, when a monomer composition mainly comprising a (meth) acrylic acid ester monomer is copolymerized in a solvent system in the presence of a polymerization initiator, an acrylic pressure-sensitive adhesive is produced, After completion of the copolymerization, morpholine is added to the acrylic pressure-sensitive adhesive solution.
【００１０】（メタ）アクリル酸アルキルエステルとし
ては、例えば、ブチル（メタ）アクリレート、２−エチ
ルヘキシル（メタ）アクリレート、ラウリル（メタ）ア
クリレートなどがあげられる。２種以上であってもよ
い。Examples of the (meth) acrylic acid alkyl ester include butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and lauryl (meth) acrylate. Two or more kinds may be used.
【００１１】また、（メタ）アクリル酸エステルモノマ
ーと共重合し得るモノマーとしては、（メタ）アクリル
酸、（メタ）アクリルアミド、グリシジル（メタ）アク
リレート、２−ヒドロキシエチル（メタ）アクリレー
ト、ヒドロキシプロピル（メタ）アクリレート、プロピ
レングリコールモノアクリレート、ジメチルアミノエチ
ルメタクリレート、酢酸ビニル、スチレンなどがあげら
れる。このモノマーは２種以上であってもよい。The monomers copolymerizable with the (meth) acrylic acid ester monomer include (meth) acrylic acid, (meth) acrylamide, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate and hydroxypropyl ( Examples thereof include (meth) acrylate, propylene glycol monoacrylate, dimethylaminoethyl methacrylate, vinyl acetate and styrene. Two or more kinds of these monomers may be used.
【００１２】重合開始剤としては、過酸化物系又はアゾ
系開始剤が一般的に用いられる。過酸化物系開始剤の種
類としては、ジアルキルパーオキサイド、パーオキシケ
タール、パーオキシエステル、ジアシルパーオキサイド
等があるが、この中で１０時間半減期温度を開始剤選択
の目安とし、特に化学構造は問題としない。上記過酸化
物系の開始剤としては、例えば、過酸化ベンゾイル、
１，１−ビス−ｔ−ヘキシルパーオキシ−３，３，５−
トリメチルシクロヘキサン、３，５，５−トリメチルヘ
キサノイルパーオキサイド等が例示できる。また、アゾ
系開始剤としては、２，２’−アゾビスイソブチロニト
リル、１，１’−アゾビスシクロヘキサン−１−カルボ
ニトリル、２，２’−アゾビス−２，４−ジメチルバレ
ロニトリル等が例示される。As the polymerization initiator, a peroxide type or azo type initiator is generally used. There are dialkyl peroxides, peroxyketals, peroxyesters, diacyl peroxides, and the like as types of peroxide initiators. Among them, the 10-hour half-life temperature is used as a guide for selecting the initiator, and the chemical structure is particularly Does not matter. Examples of the peroxide-based initiator include benzoyl peroxide,
1,1-bis-t-hexylperoxy-3,3,5-
Examples include trimethylcyclohexane and 3,5,5-trimethylhexanoyl peroxide. As the azo-based initiator, 2,2'-azobisisobutyronitrile, 1,1'-azobiscyclohexane-1-carbonitrile, 2,2'-azobis-2,4-dimethylvaleronitrile, etc. Is exemplified.
【００１３】重合開始剤の使用量は限定されるものでな
いが、通常、重合前半では、混合モノマー１００重量部
に対して０．０５〜０．３重量部とされ、重合後半で
０．５〜１．５重量部と多量に使用されるのが効果的で
ある。Although the amount of the polymerization initiator used is not limited, it is usually 0.05 to 0.3 parts by weight per 100 parts by weight of the mixed monomer in the first half of the polymerization, and 0.5 to 0.3 parts by weight in the second half of the polymerization. It is effective to use a large amount of 1.5 parts by weight.
【００１４】上記モルホリンは、分子式 C4H9ON で表さ
れる酢酸エチルなどの有機溶剤に可溶な液体であるが、
その添加量としては、残留モノマーが十分に反応するの
に足る量か、それより少量であってもよく、その量は特
に限定されない。たとえば、アクリル系コポリマー溶液
１００重量部に対してモルホリンが０．０５〜５重量部
添加される。The above morpholine is a liquid soluble in an organic solvent such as ethyl acetate represented by the molecular formula C 4 H 9 ON,
The amount to be added may be an amount sufficient for the residual monomer to sufficiently react, or may be a smaller amount than that, and the amount is not particularly limited. For example, 0.05 to 5 parts by weight of morpholine is added to 100 parts by weight of the acrylic copolymer solution.
【００１５】[0015]
【作用】請求項１記載の発明では、（メタ）アクリル酸
エステルモノマー及びこれと共重合し得るモノマーとの
重合反応は、開始反応、成長反応、停止反応、連鎖移動
反応からなるラジカル重合であるが、重合前半では、１
０時間半減期温度が、重合温度より１０℃低い温度以上
の重合開始剤によって、開始反応と成長反応が進行す
る。上記重合開始剤はラジカルの発生が遅く、重合の暴
走を引き起こすことなく、また、長時間にわたって上記
反応を進行させることになる。次いで、モノマーの転化
が相当に進んで転化率の増加が鈍くなって重合後半に至
る。この段階になると、モノマーが少なくなり、停止反
応と連鎖移動反応が頻繁に起ってポリマーの成長が妨げ
られようとするが、１０時間半減期温度が重合温度より
１５℃以上低い重合開始剤が添加される。この重合開始
剤は、ほぼ１時間以内で開始剤が半減するので、これが
モノマーラジカルの発生に寄与し、ポリマーが生成する
ことになり、停止反応と連鎖移動反応により妨げられる
ことなく重合反応が進行する。その結果、重合反応の終
了時に残存するモノマー量が実質的に無くなる。According to the first aspect of the present invention, the polymerization reaction of the (meth) acrylic acid ester monomer and the monomer copolymerizable therewith is radical polymerization consisting of an initiation reaction, a growth reaction, a termination reaction and a chain transfer reaction. However, in the first half of the polymerization, 1
The initiation reaction and the growth reaction proceed by the polymerization initiator having a 0-hour half-life temperature lower than the polymerization temperature by 10 ° C. or higher. The above-mentioned polymerization initiator is slow in generating radicals, does not cause runaway of polymerization, and causes the reaction to proceed for a long time. Then, the conversion of the monomer progresses considerably, and the increase in the conversion rate slows down to the latter half of the polymerization. At this stage, the amount of the monomer decreases, and the termination reaction and the chain transfer reaction frequently occur to prevent the growth of the polymer, but a polymerization initiator having a 10-hour half-life temperature lower than the polymerization temperature by 15 ° C. or more is used. Is added. This polymerization initiator halves in about 1 hour, which contributes to the generation of monomer radicals, which results in the formation of a polymer, and the polymerization reaction proceeds without being hindered by the termination reaction and the chain transfer reaction. To do. As a result, the amount of monomer remaining at the end of the polymerization reaction is substantially eliminated.
【００１６】更に、請求項２記載の発明では、重合開始
時に酢酸ビニルモノマーを添加しておくと、モノマーの
重合速度比が異なることにより、アクリル系モノマーが
先に消費されることとなり、従って、残存アクリルモノ
マーの少ない粘着剤溶液が得られることとなる。Further, in the invention according to claim 2, when the vinyl acetate monomer is added at the start of the polymerization, the acrylic monomer is consumed first due to the difference in the polymerization rate ratio of the monomers. An adhesive solution containing less residual acrylic monomer can be obtained.
【００１７】また、請求項３記載の発明では、共重合反
応を終了させたアクリル系コポリマー溶液にモルホリン
を添加放置するだけで、モルホリンは残存モノマーと反
応し残存アクリルモノマーは減少する。According to the third aspect of the present invention, the morpholine reacts with the residual monomer and the residual acrylic monomer is reduced only by adding morpholine to the acrylic copolymer solution in which the copolymerization reaction is completed and leaving it to stand.
【００１８】[0018]
【実施例】本願発明をさらに詳しく説明するため、以下
に実施例をあげる。なお、実施例中の「部」は「重量
部」を意味する。EXAMPLES In order to explain the present invention in more detail, examples will be given below. In addition, "part" in an Example means a "weight part."
【００１９】（実施例１） （ａ）アクリル系粘着剤の調製 温度計、攪拌器及び窒素導入管を備えた反応容器に、ブ
チルアクリレート６０部、２−エチルヘキシルアクリレ
ート３５部及びアクリル酸５部からなる混合モノマーの
５０％酢酸エチル溶液を投入し、８０℃に昇温した。(Example 1) (a) Preparation of acrylic pressure-sensitive adhesive A reaction vessel equipped with a thermometer, a stirrer and a nitrogen inlet tube was charged with 60 parts of butyl acrylate, 35 parts of 2-ethylhexyl acrylate and 5 parts of acrylic acid. A 50% ethyl acetate solution of the following mixed monomer was added and the temperature was raised to 80 ° C.
【００２０】次いで、重合開始剤として１，１−ビス−
ｔ−ヘキシルパーオキシ−３，３，５−トリメチルシク
ロヘキサン（日本油脂社製：商品名「パーヘキサＴＭ
Ｈ」，１０時間半減期温度８６．９℃）を０．１部投入
し、８０℃で重合反応を開始した。７時間経過後の重合
後半において重合開始剤として３，５，５−トリメチル
ヘキサノイルパーオキサイド（日本油脂社製：商品名
「パーロイル３５５」，１０時間半減期温度５９．５
℃）を１．０部投入して３時間重合を続けた後、冷却し
て、アクリル酸エステル系コポリマー溶液からなる粘着
剤を得た。Then, 1,1-bis- as a polymerization initiator
t-hexylperoxy-3,3,5-trimethylcyclohexane
H ", 10-hour half-life temperature 86.9 ° C) was added thereto, and the polymerization reaction was started at 80 ° C. In the latter half of the polymerization after 7 hours, 3,5,5-trimethylhexanoyl peroxide (manufactured by NOF CORPORATION: trade name "Perloyl 355", 10-hour half-life temperature 59.5) was used as a polymerization initiator.
(° C) was added and polymerization was continued for 3 hours, followed by cooling to obtain a pressure-sensitive adhesive composed of an acrylic acid ester-based copolymer solution.
【００２１】（ｂ）残存アクリルモノマー量の測定 この粘着剤について、島津製作所社製ＧＣ−１４Ａガス
クロマトグラフにより残存アクリルモノマー量を測定し
た。(B) Measurement of amount of residual acrylic monomer For this adhesive, the amount of residual acrylic monomer was measured by GC-14A gas chromatograph manufactured by Shimadzu Corporation.
【００２２】上記測定装置の測定条件は、充填剤；サー
モン３０００（信和化工社製）、インジェクション温
度；１８０℃、デテクター温度；２００℃、カラム温
度；５０℃×５分保持後、１０℃／分で昇温、２００℃
×５分保持、試料量；１マイクロリットル、測定時間：
２０分とした。The measuring conditions of the above measuring apparatus are as follows: filler; Salmon 3000 (manufactured by Shinwa Kako Co., Ltd.), injection temperature; 180 ° C., detector temperature; 200 ° C., column temperature; Temperature rise at 200 ℃
× 5 minutes retention, sample amount; 1 microliter, measurement time:
20 minutes.
【００２３】測定手順としては、アクリル酸、２−エチ
ルヘキシルアクリレート（２ＥＨＡ）、ブチルアクリレ
ート（ＢＡ）を、それぞれ０．００５ｇ、０．０５ｇ、
０．５ｇずつ計量し、これを酢酸エチルで２５ミリリッ
トルに希釈して標準液を作成した。As the measuring procedure, acrylic acid, 2-ethylhexyl acrylate (2EHA) and butyl acrylate (BA) were added at 0.005 g, 0.05 g, and
Each 0.5 g was weighed and diluted to 25 ml with ethyl acetate to prepare a standard solution.
【００２４】この標準液１マイクロリットルを上記測定
装置に入れ、上記条件で運転し、２−エチルヘキシルア
クリレートとブチルアクリレートの保持時間とピーク面
積を測定し、横軸にピーク面積、縦軸に２−エチルヘキ
シルアクリレートとブチルアクリレートそれぞれの重さ
をとって検量線を引き、それぞれの傾きＱ2EHA、ＱBAを
求めた。1 microliter of this standard solution was placed in the above measuring apparatus and operated under the above conditions to measure the retention time and the peak area of 2-ethylhexyl acrylate and butyl acrylate. The horizontal axis represents the peak area and the vertical axis represents 2-. A calibration curve was drawn by weighing the weights of ethylhexyl acrylate and butyl acrylate, and the respective slopes Q 2EHA and Q BA were determined.
【００２５】次いで、各粘着剤２．５ｇを酢酸エチルで
２５ミリリットルに希釈し、この１マイクロリットルを
上記測定装置に入れ、上記条件で運転し、２−エチルヘ
キシルアクリレートとブチルアクリレートのピーク面積
を測定した。これらの測定結果から、次式により残存ア
クリルモノマー量を求めた。この結果は表１に示すとお
りであった。Next, 2.5 g of each adhesive was diluted to 25 ml with ethyl acetate, and 1 microliter of this adhesive was put into the above measuring device and operated under the above conditions to measure the peak areas of 2-ethylhexyl acrylate and butyl acrylate. did. From these measurement results, the amount of residual acrylic monomer was determined by the following formula. The results are shown in Table 1.
【００２６】なお、上記７時間経過後の時点でサンプリ
ングを行い、残存アクリルモノマーを測定したところ
２．０％であり、重合率は約９６％であった。After the lapse of 7 hours, sampling was performed and the residual acrylic monomer was measured to be 2.0%, and the polymerization rate was about 96%.
【００２７】[0027]
【数１】 [Equation 1]
【００２８】（実施例２）重合前半で投入した重合開始
剤を過酸化ベンゾイル（日本油脂社製：商品名「ナイパ
ーＢＭＴ Ｋ−４０」、１０時間半減期温度７４℃）を
０．０５部使用したこと以外は実施例１と同様にして粘
着剤を得、その残存モノマー量を求めた。この結果は表
１に示すとおりであった。(Example 2) 0.05 part of benzoyl peroxide (manufactured by NOF CORPORATION: trade name "NIPER BMT K-40", 10 hour half-life temperature 74 ° C) was used as the polymerization initiator charged in the first half of the polymerization. A pressure-sensitive adhesive was obtained in the same manner as in Example 1 except for the above, and the residual monomer amount was determined. The results are shown in Table 1.
【００２９】（比較例１）７時間経過後の重合後半にお
いて投入した重合開始剤を過酸化ベンゾイル「ナイパー
ＢＭＴ Ｋ−４０」としたこと以外は実施例１と同様に
して粘着剤を得、その残存モノマー量を求めた。この結
果は表１に示すとおりであった。(Comparative Example 1) A pressure-sensitive adhesive was obtained in the same manner as in Example 1 except that benzoyl peroxide "Nyper BMT K-40" was used as the polymerization initiator charged in the latter half of the polymerization after 7 hours. The amount of residual monomer was determined. The results are shown in Table 1.
【００３０】（比較例２）７時間経過後の重合後半にお
いて投入した重合開始剤を重合前半で使用した「パーヘ
キサＴＭＨ」としたこと以外は実施例１と同様にして粘
着剤を得、その残存モノマー量を求めた。この結果は表
１に示すとおりであった。(Comparative Example 2) A pressure-sensitive adhesive was obtained in the same manner as in Example 1 except that the polymerization initiator added in the latter half of the polymerization after 7 hours was "Perhexa TMH" used in the first half of the polymerization, and the residue was obtained. The amount of monomer was determined. The results are shown in Table 1.
【００３１】（実施例３〜４）重合開始時に酢酸ビニル
５．０部（実施例３）、２．５部（実施例４）をそれぞ
れ投入したこと以外は実施例１と同様にして各粘着剤を
得、その残存モノマー量を求めた。この結果は表１に示
すとおりであった。(Examples 3 to 4) Adhesion was performed in the same manner as in Example 1 except that 5.0 parts of vinyl acetate (Example 3) and 2.5 parts (Example 4) were added at the start of polymerization. The agent was obtained and the amount of residual monomer was determined. The results are shown in Table 1.
【００３２】（比較例３）重合開始時に酢酸ビニル５．
０部投入し、７時間経過後の重合後半において投入した
重合開始剤を過酸化ベンゾイル「ナイパーＢＭＴ Ｋ−
４０」としたこと以外は実施例１と同様にして粘着剤を
得、その残存モノマー量を求めた。この結果は表１に示
すとおりであった。Comparative Example 3 Vinyl acetate at the start of polymerization 5.
The polymerization initiator added in the latter half of the polymerization after 7 hours had passed after adding 0 parts of benzoyl peroxide “Nyper BMT K-
A pressure-sensitive adhesive was obtained in the same manner as in Example 1 except that "40" was used, and the amount of residual monomer was determined. The results are shown in Table 1.
【００３３】（比較例４）重合開始時に酢酸ビニル２．
５部投入し、７時間経過後の重合後半において投入した
重合開始剤を重合前半で使用した「パーヘキサＴＭＨ」
としたこと以外は実施例１と同様にして粘着剤を得、そ
の残存モノマー量を求めた。この結果は表１に示すとお
りであった。Comparative Example 4 Vinyl acetate at the start of polymerization 2.
"Perhexa TMH" in which 5 parts were added and the polymerization initiator added in the latter half of the polymerization after 7 hours was used in the first half of the polymerization
A pressure-sensitive adhesive was obtained in the same manner as in Example 1 except that the above was used, and the residual monomer amount was determined. The results are shown in Table 1.
【００３４】[0034]
【表１】 [Table 1]
【００３５】（実施例５〜７） （ａ）アクリル酸エステル系コポリマー溶液の調製 温度計、攪拌器及び窒素導入管を備えた反応容器に、ブ
チルアクリレート６０部、２−エチルヘキシルアクリレ
ート３５部及びアクリル酸５部からなる混合モノマーの
５０％酢酸エチル溶液を投入し、８０℃に昇温した。Examples 5 to 7 (a) Preparation of Acrylic Ester Copolymer Solution In a reaction vessel equipped with a thermometer, a stirrer and a nitrogen inlet tube, 60 parts of butyl acrylate, 35 parts of 2-ethylhexyl acrylate and acryl. A 50% ethyl acetate solution of a mixed monomer consisting of 5 parts of acid was added and the temperature was raised to 80 ° C.
【００３６】次いで、重合開始剤の過酸化ベンゾイル
０．１部を投入し、８０℃で重合反応を開始した。７時
間経過後冷却してアクリル酸エステル系コポリマー溶液
を得た。このアクリル酸エステル系コポリマー溶液１０
０部に対し、モルホリン０．０５部、０．５部、５部を
それぞれ添加して室温で２４時間放置して、溶液型のア
クリル系粘着剤を得た。得られた各粘着剤について、実
施例同様残存アクリルモノマー量を測定した。なお、モ
ルホリンを添加しない場合についても同様にして残存モ
ノマー量を求めた。Then, 0.1 part of benzoyl peroxide as a polymerization initiator was added, and the polymerization reaction was started at 80 ° C. After 7 hours, the solution was cooled to obtain an acrylic ester copolymer solution. This acrylic ester copolymer solution 10
Morpholine (0.05 parts, 0.5 parts, and 5 parts) was added to 0 parts, and the mixture was allowed to stand at room temperature for 24 hours to obtain a solution-type acrylic pressure-sensitive adhesive. For each of the obtained pressure-sensitive adhesives, the amount of residual acrylic monomer was measured as in the examples. The amount of residual monomer was determined in the same manner even when morpholine was not added.
【００３７】これらの残存モノマー量は、モノマーを添
加しない場合０．８８重量％であったのに対し、モルホ
リンを０．０５部、０．５部、５部それぞれ添加した場
合、それぞれ、０．８０重量％、０．３１重量％、０．
０８重量％であった。The amount of these residual monomers was 0.88% by weight when no monomer was added, whereas when the amount of morpholine was 0.05 part, 0.5 part, and 5 parts, respectively, it was 0. 80% by weight, 0.31% by weight, 0.
It was 08% by weight.
【００３８】この結果から明らかなとおり、モルホリン
を添加することにより、アクリル系粘着剤中の残存モノ
マー量を減少することができた。As is clear from these results, the amount of residual monomer in the acrylic pressure-sensitive adhesive could be reduced by adding morpholine.
【００３９】[0039]
【発明の効果】この発明においては、重合の前半と後半
とで、上記のとおりの１０時間半減期温度の異なる重合
開始剤を添加することによって、残存アクリルモノマー
を著しく減少させることができ、残存アクリルモノマー
の少ないアクリル系粘着剤が提供される。この際、重合
開始時に酢酸ビニルモノマーを転化することにより、残
存アクリルモノマーは一層減少させることができ、より
残存アクリルモノマーの少ないアクリル系粘着剤が提供
される。また、重合反応後のアクリル系コポリマー溶液
にモルホリンを添加放置するだけで、従来の重合法その
ものを変えることなく残存モノマーを減少させることが
でき、残存アクリルモノマーの少ない溶剤型アクリル系
粘着剤を極めて簡便に製造することができる。According to the present invention, residual acrylic monomers can be remarkably reduced by adding polymerization initiators having different 10-hour half-life temperatures as described above in the first half and second half of the polymerization. An acrylic pressure-sensitive adhesive having a small amount of acrylic monomer is provided. At this time, by converting the vinyl acetate monomer at the start of the polymerization, the residual acrylic monomer can be further reduced, and an acrylic pressure-sensitive adhesive containing less residual acrylic monomer is provided. In addition, by simply adding morpholine to the acrylic copolymer solution after the polymerization reaction and allowing it to stand, it is possible to reduce the residual monomer without changing the conventional polymerization method itself. It can be easily manufactured.
Claims (3)
主体とするモノマー組成を溶剤系において重合開始剤の
存在下で共重合させ、得られたアクリル酸エステル系コ
ポリマーを主成分としてアクリル系粘着剤を製造する方
法において、重合率９０％までの重合前半では、１０時
間半減期温度が、重合温度より１０℃低い温度以上の重
合開始剤を使用し、その後重合後半で、１０時間半減期
温度が、重合温度より１５℃以上低い重合開始剤を使用
することを特徴とするアクリル系粘着剤の製造方法。1. A monomer composition mainly composed of a (meth) acrylic acid ester monomer is copolymerized in a solvent system in the presence of a polymerization initiator, and an acrylic pressure-sensitive adhesive is obtained by using the obtained acrylic acid ester copolymer as a main component. In the method for producing, a polymerization initiator having a 10-hour half-life temperature of 10 ° C. or lower lower than the polymerization temperature in the first half of the polymerization up to 90% is used, and then a 10-hour half-life temperature of the latter half of the polymerization is A method for producing an acrylic pressure-sensitive adhesive, which comprises using a polymerization initiator lower than the polymerization temperature by 15 ° C. or more.
を特徴とする請求項１記載のアクリル系粘着剤の製造方
法。2. The method for producing an acrylic pressure-sensitive adhesive according to claim 1, wherein vinyl acetate is added at the start of polymerization.
主体とするモノマー組成を溶剤系において重合開始剤の
存在下で共重合させ、アクリル系粘着剤を製造するにあ
たり、共重合終了後、該アクリル系粘着剤溶液にモルホ
リンを添加することを特徴とするアクリル系粘着剤の製
造方法。3. When an acrylic pressure-sensitive adhesive is produced by copolymerizing a monomer composition mainly composed of a (meth) acrylic acid ester monomer in a solvent system in the presence of a polymerization initiator, the acrylic system is prepared after completion of the copolymerization. A method for producing an acrylic pressure-sensitive adhesive, which comprises adding morpholine to the pressure-sensitive adhesive solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32167992A JP3357100B2 (en) | 1992-12-01 | 1992-12-01 | Method for producing acrylic adhesive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32167992A JP3357100B2 (en) | 1992-12-01 | 1992-12-01 | Method for producing acrylic adhesive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06166859A true JPH06166859A (en) | 1994-06-14 |
| JP3357100B2 JP3357100B2 (en) | 2002-12-16 |
Family
ID=18135214
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32167992A Expired - Fee Related JP3357100B2 (en) | 1992-12-01 | 1992-12-01 | Method for producing acrylic adhesive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3357100B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001046328A1 (en) * | 1999-12-22 | 2001-06-28 | Soken Chemical & Engineering Co., Ltd. | Acrylic polymer compositions, acrylic pressure-sensitive adhesion tapes and process for producing the same |
| KR100385720B1 (en) * | 1999-04-30 | 2003-05-27 | 주식회사 엘지화학 | Acrylic pressure-sensitive adhesive composition for optical use having improved rework property and laminates coated therewith |
| WO2007060710A1 (en) * | 2005-11-22 | 2007-05-31 | Seed Co., Ltd. | Manicure preparation and process for producing the same |
| JP2009520056A (en) * | 2005-12-16 | 2009-05-21 | スリーエム イノベイティブ プロパティズ カンパニー | Method for free radical polymerization of vinyl monomers |
| JP2013056994A (en) * | 2011-09-08 | 2013-03-28 | Soken Chem & Eng Co Ltd | Pressure-sensitive adhesive sheet for electro-conductive film and method for production of pressure-sensitive adhesive sheet for electro-conductive film |
| JP2019085555A (en) * | 2017-11-01 | 2019-06-06 | 三洋化成工業株式会社 | Adhesive composition |
| JP2019085556A (en) * | 2017-11-01 | 2019-06-06 | 三洋化成工業株式会社 | Adhesive composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| WO2007060710A1 (en) * | 2005-11-22 | 2007-05-31 | Seed Co., Ltd. | Manicure preparation and process for producing the same |
| JP2009520056A (en) * | 2005-12-16 | 2009-05-21 | スリーエム イノベイティブ プロパティズ カンパニー | Method for free radical polymerization of vinyl monomers |
| JP2013056994A (en) * | 2011-09-08 | 2013-03-28 | Soken Chem & Eng Co Ltd | Pressure-sensitive adhesive sheet for electro-conductive film and method for production of pressure-sensitive adhesive sheet for electro-conductive film |
| JP2019085555A (en) * | 2017-11-01 | 2019-06-06 | 三洋化成工業株式会社 | Adhesive composition |
| JP2019085556A (en) * | 2017-11-01 | 2019-06-06 | 三洋化成工業株式会社 | Adhesive composition |
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|---|---|
| JP3357100B2 (en) | 2002-12-16 |
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