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JP3835950B2 - Hydrocarbon resin - Google Patents
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JP3835950B2 - Hydrocarbon resin - Google Patents

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JP3835950B2
JP3835950B2 JP18985899A JP18985899A JP3835950B2 JP 3835950 B2 JP3835950 B2 JP 3835950B2 JP 18985899 A JP18985899 A JP 18985899A JP 18985899 A JP18985899 A JP 18985899A JP 3835950 B2 JP3835950 B2 JP 3835950B2
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molecular weight
hydrocarbon resin
catalyst
polymerization
general formula
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JP2001019719A (en
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卓 時田
俊幸 伊藤
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Mitsui Chemicals Inc
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Mitsui Chemicals Inc
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Description

【0001】
【発明の属する技術分野】
本発明は、新規な炭化水素樹脂に関し、特には樹脂中に水酸基を含有する芳香族系炭化水素樹脂に関する。
【0002】
【従来の技術】
ゴム系感圧接着剤及びエチレン・酢酸ビニル共重合体系及びスチレンブロックコポリマー系ホットメルト接着剤に配合される粘着付与樹脂として、スチレン、ビニルトルエン、α−メチルスチレン等の低分子量重合体や石油樹脂を使用することが知られている。しかし、エチレン・酢酸ビニル共重合体との相溶性不足により高い接着強度が発現しない、また通常の不飽和炭化水素を含有する留分から製造された石油樹脂は、色相、熱安定性が不十分である等の問題を有している。
【0003】
本発明者らは、これらの問題を改良するものとして、イソプロペニルトルエンと石油精製や石油分解の際に副生する炭素数4〜5の留分から選ばれる任意の留分とを、特定割合で重合して得られる重合体を用いること、及びイソプロペニルトルエンの単独重合体を用いることを先に提案した。(特開昭49−118729号公報、特開昭49−128945号公報,特公昭54−34033号公報)
【0004】
しかし、これらの炭化水素樹脂は分子内に極性基を有しておらず、また分子量分布が広いために、例えばアクリル樹脂等の極性樹脂との相溶性は未だ十分とは言えなかった。さらに、軟化点を維持するためには分子量を高くする必要があり、これも他樹脂との相溶性を阻害する原因となっていた。分子内に水酸基を含有した炭化水素樹脂としてテルペン・フェノール樹脂が知られているが、これらは色相が不良であり、色相改良のために水素添加を行うと、その反応経路が煩雑になるため生産コストが上昇するという問題を抱えている。
【0005】
【発明が解決しようとする課題】
そこで本発明の課題は、上記問題を解決するために水酸基を分子内に含有した分子量分布が狭く、一定軟化点を維持しつつ分子量が低い、色相に優れた炭化水素樹脂を提案することである。
【0006】
【課題を解決するための手段】
本発明は、次の炭化水素樹脂に関する。
下記一般式(I)で表されるスチレン系モノマーと、下記一般式(II)で表されるフェノール系モノマーとの共重合体であり、
(A)(I)/(II)のモル比が99/1〜50/50であり、
(B)重量平均分子量が200〜3000であり、
(C)分子量分布Mw/Mnが1.5以下である
ことを特徴とする炭化水素樹脂。
【0007】
【化3】

Figure 0003835950
【0008】
【化4】
Figure 0003835950
〔式中、R5、R6及びR7は同一でも異なっていてもよく、水素原子または炭素数4以下のアルキル基である。〕
【0009】
以下に本発明につき、詳細に説明する。
本発明の炭化水素樹脂は、前記一般式(I)で表されるスチレン系モノマーと、一般式(II)で表されるフェノール系モノマーの共重合によって得られる樹脂である。この樹脂は一般式(I)で表されるスチレン系モノマーと、一般式(II)で表されるフェノール系モノマーの組み合わせによる、二元共重合体、三元共重合体、四元共重合体等の多元共重合体のいずれでも良い。
【0010】
本発明において、前記一般式(I)で表されるスチレン系モノマーは、1種単独でも2種以上を組み合わせて用いてもよい。
【0011】
また、フェノール系モノマーを表す前記一般式(II)において、R5、R6及びR7は同一でも異なってもよく、水素原子または炭素数4以下のアルキル基である。この炭素数4以下のアルキル基としては、例えば、メチル基、エチル基、プロピル基、ブチル基等が挙げられる。
この一般式(II)で表されるフェノール系モノマーの具体例としては、ビニルフェノール、イソプロペニルフェノール等を挙げることができる。
【0012】
本発明の炭化水素樹脂における前記スチレン系モノマーとフェノール系モノマーの含有割合は、モル比で99/1〜50/50の割合、好ましくは97/3〜60/40の割合である。
【0013】
本発明の炭化水素樹脂の製造は、前記スチレン系モノマー、フェノール系モノマーを触媒の存在下に共重合反応させて行うことができる。
重合に用いられる触媒は、一般にフリーデルクラフツ触媒として知られるものであり、例えば塩化アルミニウム、臭化アルミニウム、ジクロルモノエチルアルミニウム、四塩化チタン、四塩化スズ、3フッ化ホウ素の各種錯体等を挙げることができる。
【0014】
触媒の使用量はスチレン系モノマーとフェノール系モノマーの合計量に対して、0.01〜5.0重量%の範囲にあることが好ましく、さらに0.05〜3.0重量%の範囲にあることが好ましい。
また、重合反応の際に、反応熱の除去や反応混合物の高粘度化の抑制等のために、芳香族炭化水素、脂肪族炭化水素及び脂環族炭化水素から選ばれた少なくとも1種の炭化水素溶媒中で重合反応を行うことが好ましい。好ましい炭化水素溶媒として、トルエン、キシレン、エチルベンゼン、メシチレン、クメン、シメン等の芳香族炭化水素、あるいはこれらの混合物、またはこれらとペンタン、ヘキサン、ヘプタン、オクタン等の脂肪族炭化水素及び/またはシクロペンタン、シクロヘキサン、メチルシクロヘキサン等の脂環式炭化水素との混合物を挙げることができる。また、重合の際には、反応混合物中のモノマーの初期濃度が10〜80重量%の範囲になるように、炭化水素溶媒の量を調整することが好ましい。
【0015】
重合温度は使用するモノマーならびに触媒の種類及びその量によって異なるが、通常、−30℃〜50℃の範囲で行うことが好ましい。
また、重合時間は、一般には0.5〜5時間程度であり、通常、1〜2時間で重合はほとんど完結する。
重合様式としては、回分式または連続式のいずれを採用することもできる。さらに、多段重合も行うことができる。
【0016】
重合終了後に洗浄により触媒残さを除去する。洗浄液は通常、水酸化カリウム、水酸化ナトリウム等を溶解したアルカリ水溶液あるいは、メタノール等のアルコールを用いることが好ましく、特にはメタノールによる洗浄脱灰が好ましい。洗浄終了後に未反応モノマー、重合溶媒等を減圧留去して、本発明の炭化水素樹脂を得る。
【0017】
本発明の炭化水素樹脂の重量平均分子量は200〜3000であり、さらに好ましくは、300〜2000の範囲である。また、重量平均分子量/数平均分子量で表される分子量分布Mw/Mnは1.5以下の範囲である。
本発明の炭化水素樹脂の軟化点は50〜150℃の範囲にあることが好ましい。
【0018】
本発明の炭化水素樹脂には、必要に応じて、さらに本発明の目的を損なわない範囲において、各種の配合剤、例えば耐候安定剤、酸化防止剤等を配合することができる。
【0019】
本発明の炭化水素樹脂は、ホットメルト接着剤及び感圧接着剤用粘着付与剤、印刷インキ、塗料用接着剤、紙処理剤、熱転写インクリボンバインダー及びトナー等の配合物としても使用することができる。
【0020】
以下に本発明の実施例を示し、本発明をより具体的に説明するが、本発明はこれらの実施例により何ら制限されるものではない。
【0021】
以下の実施例において樹脂の物性は以下の方法により測定した。
【0022】
Figure 0003835950
【0023】
<アクリル重合体の調製>
(参考例1:ブチル系アクリル重合体)
攪拌装置、冷却管、滴下ロート及び窒素導入管を備えた反応装置に酢酸エチル100gを仕込み、80℃まで昇温した。次いで、予めアクリル酸ブチル97g、アクリル酸3g及び過酸化ベンゾイル0.2gからなる混合液を仕込んだ滴下ロートより、窒素気流下に3時間かけて滴下し、さらに温度を保ったまま1時間加熱攪拌し、反応を完結させた。得られた重合体は固形分濃度50%であった。
【0024】
(参考例2:2−エチルヘキシル系アクリル重合体)
一方社油脂工業製 バインゾールR−50(固形分濃度44%)を使用した。
【0025】
実施例1
軟化点96℃のIPT/IPP共重合体の重合
撹拌機、温度計、及びコンデンサー付きベント管を取り付けた1Lの4ツ口フラスコに、イソプロペニルトルエン(IPT)160g、イソプロペニルフェノール(IPP)40g及び脱水精製したトルエン300gを仕込み室温で良く撹拌する。均一に分散した混合液を、ドライアイスで冷却したアルコール浴を使用することによって20℃まで冷却する。一方、触媒供給用の25mL滴下ロートに、窒素雰囲気下でボロントリフロライドフェノラート錯体(フェノール1.7倍当量)0.24gと、脱水精製したトルエンを触媒の10倍量入れ、該滴下ロートを1L4ツ口フラスコに取り付ける。その後、触媒を徐々に反応器へ供給し反応を開始する。反応混合物の温度はドライアイスで冷却したアルコール浴を使用することによって20℃に保持する。
【0026】
10分間で触媒の供給を完了させ、触媒供給開始30分後に反応混合物の温度を5℃まで低下させそのまま2時間後反応を行う。重合終了後、反応混合物にメタノールを添加し重合反応を停止させた。得られた反応混合物を多量の水で5回洗浄した後エバポレーターで溶媒及び未反応モノマーを減圧留去してイソプロペニルトルエン・イソプロペニルフェノール共重合体を得た。この時の重合条件(モノマー供給比,触媒量,樹脂組成,収率)を表1に示し、又、得られたイソプロペニルトルエン・イソプロペニルフェノール共重合体の樹脂物性(軟化点,色相,溶融粘度,分子量,分子量分布)を測定した。結果を表2に示した。
【0027】
比較例1
撹拌機、温度計、及びコンデンサー付きベント管を取り付けた1Lの4ツ口フラスコに、イソプロペニルトルエン200g、及び、脱水精製したトルエン200gを仕込み良く撹拌する。均一に分散した混合液を、ドライアイスで冷却したアルコール浴を使用することによって5℃迄冷却する。一方、触媒供給用の25mL滴下ロートに、窒素雰囲気下でボロントリフロライドフェノラート錯体(フェノール1.7倍当量)0.4gと、脱水精製したトルエンを触媒の10倍量入れ、該滴下ロートを1L4ツ口フラスコに取り付ける。その後、触媒を徐々に反応器へ供給し反応を開始する。反応混合物の温度はドライアイスで冷却したアルコール浴を使用することによって5℃に保持する。10分間で触媒の供給を完了させ、温度を5℃に保ったまま2時間後反応を行う。重合終了後、反応混合物に1NのNaOH水溶液を添加し重合反応を停止させた。得られた反応混合物を多量の水で5回洗浄した後エバポレーターで溶媒及び未反応モノマーを減圧留去してイソプロペニルトルエンの単独重合体を得た。この時の重合条件(モノマー供給比,触媒量,樹脂組成,収率)を表1に示し、又、得られたイソプロペニルトルエン単独重合体の樹脂物性(色相,軟化点,分子量,分子量分布,溶融粘度)を測定した。結果を表2に示した。
【0028】
比較例2
撹拌機、温度計、及びコンデンサー付きベント管を取り付けた1Lの4ツ口フラスコに、イソプロペニルトルエン200g、及び、脱水精製したトルエン200gを仕込み良く撹拌する。均一に分散した混合液を、ドライアイスで冷却したアルコール浴を使用することによって5℃迄冷却する。一方、触媒供給用の25mL滴下ロートに、窒素雰囲気下でボロントリフロライドフェノラート錯体(フェノール1.6倍当量)0.6gと、脱水精製したトルエンを触媒の10倍量入れ、該滴下ロートを1L4ツ口フラスコに取り付ける。その後、触媒を徐々に反応器へ供給し反応を開始する。反応混合物の温度はドライアイスで冷却したアルコール浴を使用することによって5℃に保持する。10分間で触媒の供給を完了させ、温度を5℃に保ったまま2時間後反応を行う。重合終了後、反応混合物に1NのNaOH水溶液を添加し重合反応を停止させた。得られた反応混合物を多量の水で5回洗浄した後エバポレーターで溶媒及び未反応モノマーを減圧留去してイソプロペニルトルエンの単独重合体を得た。この時の重合条件(モノマー供給比,触媒量,樹脂組成,収率)を表1に示し、又、得られたイソプロペニルトルエン単独重合体の樹脂物性(軟化点,色相,溶融粘度,分子量,分子量分布)を測定した。結果を表2に示した。
【0029】
【表1】
Figure 0003835950
【0030】
【表2】
Figure 0003835950
【0031】
<アクリル接着剤の調製及び接着力評価>
評価は以下のように行った。
接着剤外観:目視により○〜△〜×の3段階に分類した。
○:透明
△:一部、濁りあり
×:濁りあり
接着強度 :180°剥離試験により行った。
【0032】
実施例2
参考例1で合成したアクリル系重合体と実施例1で重合した炭化水素樹脂を固形分比で90/10の割合で混合し、十分攪拌した後、コロネートL(ポリイソシアネート系化合物:日本ポリウレタン社製)を2.7部添加してアクリル系接着剤とした。接着剤の外観は透明であった。
該接着剤を厚さ40μmのPETフィルム上に、乾燥後の膜厚が30μmとなるように塗布し、80℃で5分乾燥し、粘着テープを作成した。この粘着テープをPETフィルムに500g圧着下に張り付け試料とし、接着強度を測定した。結果を表3に示した。
【0033】
実施例3
参考例2で合成したアクリル系重合体を用いる以外は実施例2と同様に接着剤を調製し、接着強度を測定した。結果を表3に示した。
【0034】
比較例3〜6
参考例1、2で合成したアクリル系重合体と、比較例1、2で重合した炭化水素樹脂を用いる以外は実施例2と同様に接着剤を調製し、接着強度を測定した。結果を表3に示した。
【0035】
【表3】
Figure 0003835950
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a novel hydrocarbon resin, and more particularly to an aromatic hydrocarbon resin containing a hydroxyl group in the resin.
[0002]
[Prior art]
Low molecular weight polymers such as styrene, vinyltoluene, α-methylstyrene, and petroleum resins as tackifier resins blended in rubber pressure sensitive adhesives, ethylene / vinyl acetate copolymer systems, and styrene block copolymer hot melt adhesives Is known to use. However, high adhesive strength is not expressed due to insufficient compatibility with ethylene / vinyl acetate copolymer, and petroleum resins produced from fractions containing ordinary unsaturated hydrocarbons have insufficient hue and thermal stability. It has some problems.
[0003]
In order to improve these problems, the inventors of the present invention specified isopropenyltoluene and an arbitrary fraction selected from fractions having 4 to 5 carbon atoms produced as a by-product during petroleum refining and petroleum decomposition at a specific ratio. It was previously proposed to use a polymer obtained by polymerization and to use a homopolymer of isopropenyltoluene. (Japanese Patent Laid-Open No. 49-118729, Japanese Patent Laid-Open No. 49-128945, Japanese Patent Publication No. 54-34033)
[0004]
However, these hydrocarbon resins do not have a polar group in the molecule and have a wide molecular weight distribution, so that compatibility with a polar resin such as an acrylic resin has not been sufficient. Furthermore, in order to maintain the softening point, it is necessary to increase the molecular weight, which has also caused the compatibility with other resins to be inhibited. Terpene / phenolic resins are known as hydrocarbon resins containing hydroxyl groups in the molecule, but these have poor hues, and if hydrogenation is performed to improve hues, the reaction route becomes complicated, producing There is a problem that the cost increases.
[0005]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to propose a hydrocarbon resin excellent in hue that has a narrow molecular weight distribution containing a hydroxyl group in the molecule, a low molecular weight while maintaining a constant softening point, in order to solve the above problems. .
[0006]
[Means for Solving the Problems]
The present invention relates to the following hydrocarbon resins.
A copolymer of a styrene monomer represented by the following general formula (I) and a phenol monomer represented by the following general formula (II):
(A) The molar ratio of (I) / (II) is 99/1 to 50/50,
(B) The weight average molecular weight is 200 to 3000,
(C) A hydrocarbon resin having a molecular weight distribution Mw / Mn of 1.5 or less.
[0007]
[Chemical 3]
Figure 0003835950
[0008]
[Formula 4]
Figure 0003835950
[Wherein, R 5 , R 6 and R 7 may be the same or different and are a hydrogen atom or an alkyl group having 4 or less carbon atoms. ]
[0009]
Hereinafter, the present invention will be described in detail.
The hydrocarbon resin of the present invention is a resin obtained by copolymerization of a styrene monomer represented by the general formula (I) and a phenol monomer represented by the general formula (II). This resin is a binary copolymer, ternary copolymer, or quaternary copolymer comprising a combination of a styrene monomer represented by general formula (I) and a phenol monomer represented by general formula (II). Any of multi-component copolymers such as
[0010]
In the present invention, the styrene monomer represented by the general formula (I) may be used alone or in combination of two or more.
[0011]
Moreover, in the said general formula (II) showing a phenol-type monomer, R < 5 >, R < 6 > and R < 7 > may be same or different and are a hydrogen atom or a C4 or less alkyl group. Examples of the alkyl group having 4 or less carbon atoms include a methyl group, an ethyl group, a propyl group, and a butyl group.
Specific examples of the phenolic monomer represented by the general formula (II) include vinylphenol and isopropenylphenol.
[0012]
The content ratio of the styrene monomer and the phenol monomer in the hydrocarbon resin of the present invention is a ratio of 99/1 to 50/50, preferably 97/3 to 60/40, in molar ratio.
[0013]
The hydrocarbon resin of the present invention can be produced by copolymerizing the styrene monomer and phenol monomer in the presence of a catalyst.
The catalyst used for the polymerization is generally known as a Friedel-Crafts catalyst, and examples thereof include various complexes of aluminum chloride, aluminum bromide, dichloromonoethylaluminum, titanium tetrachloride, tin tetrachloride, and boron trifluoride. be able to.
[0014]
The amount of the catalyst used is preferably in the range of 0.01 to 5.0% by weight, more preferably in the range of 0.05 to 3.0% by weight, based on the total amount of the styrene monomer and the phenol monomer. It is preferable.
Further, at the time of the polymerization reaction, at least one kind of carbon selected from aromatic hydrocarbons, aliphatic hydrocarbons and alicyclic hydrocarbons is used for removing heat of reaction and suppressing increase in viscosity of the reaction mixture. The polymerization reaction is preferably performed in a hydrogen solvent. Preferred hydrocarbon solvents include aromatic hydrocarbons such as toluene, xylene, ethylbenzene, mesitylene, cumene, and cymene, or mixtures thereof, and aliphatic hydrocarbons such as pentane, hexane, heptane, and octane and / or cyclopentane. And mixtures with alicyclic hydrocarbons such as cyclohexane and methylcyclohexane. In the polymerization, the amount of the hydrocarbon solvent is preferably adjusted so that the initial concentration of the monomer in the reaction mixture is in the range of 10 to 80% by weight.
[0015]
The polymerization temperature varies depending on the monomer used and the type and amount of the catalyst, but it is usually preferably in the range of −30 ° C. to 50 ° C.
The polymerization time is generally about 0.5 to 5 hours, and the polymerization is usually almost completed in 1 to 2 hours.
As the polymerization mode, either a batch system or a continuous system can be adopted. Furthermore, multistage polymerization can also be performed.
[0016]
After the polymerization is completed, the catalyst residue is removed by washing. In general, it is preferable to use an alkaline aqueous solution in which potassium hydroxide, sodium hydroxide, or the like is dissolved, or an alcohol such as methanol, and cleaning deashing with methanol is particularly preferable. After completion of washing, unreacted monomers, polymerization solvent and the like are distilled off under reduced pressure to obtain the hydrocarbon resin of the present invention.
[0017]
The weight average molecular weight of the hydrocarbon resin of the present invention is 200 to 3000, and more preferably 300 to 2000. Further, the molecular weight distribution Mw / Mn represented by weight average molecular weight / number average molecular weight is in the range of 1.5 or less.
The softening point of the hydrocarbon resin of the present invention is preferably in the range of 50 to 150 ° C.
[0018]
In the hydrocarbon resin of the present invention, various compounding agents, for example, a weather resistance stabilizer, an antioxidant, and the like can be blended as necessary within a range not impairing the object of the present invention.
[0019]
The hydrocarbon resin of the present invention may also be used as a blend of hot melt adhesives and pressure sensitive adhesive tackifiers, printing inks, paint adhesives, paper treatment agents, thermal transfer ink ribbon binders, toners, and the like. it can.
[0020]
EXAMPLES Examples of the present invention will be shown below, and the present invention will be described more specifically. However, the present invention is not limited to these examples.
[0021]
In the following examples, the physical properties of the resin were measured by the following methods.
[0022]
Figure 0003835950
[0023]
<Preparation of acrylic polymer>
(Reference Example 1: Butyl acrylic polymer)
A reactor equipped with a stirrer, a cooling tube, a dropping funnel and a nitrogen introducing tube was charged with 100 g of ethyl acetate and heated to 80 ° C. Next, from a dropping funnel previously charged with a mixed solution composed of 97 g of butyl acrylate, 3 g of acrylic acid and 0.2 g of benzoyl peroxide, the mixture was dropped over 3 hours under a nitrogen stream, and further heated and stirred for 1 hour while maintaining the temperature. To complete the reaction. The obtained polymer had a solid content concentration of 50%.
[0024]
(Reference Example 2: 2-ethylhexyl acrylic polymer)
On the other hand, Vinesol R-50 (solid content concentration: 44%) manufactured by Yushi Kogyo Co., Ltd. was used.
[0025]
Example 1
To a 1 L 4-necked flask equipped with a polymerization stirrer, a thermometer, and a vent tube with a condenser having a softening point of 96 ° C., 160 g of isopropenyl toluene (IPT) and 40 g of isopropenyl phenol (IPP) And 300 g of dehydrated and purified toluene is charged and stirred well at room temperature. The uniformly dispersed mixture is cooled to 20 ° C. by using an alcohol bath cooled with dry ice. On the other hand, in a 25 mL dropping funnel for supplying catalyst, 0.24 g of boron trifluoride phenolate complex (1.7 times equivalent of phenol) and 10 times the amount of dehydrated toluene were added under a nitrogen atmosphere, and the dropping funnel was added. Is attached to a 1 L 4-neck flask. Thereafter, the catalyst is gradually supplied to the reactor to start the reaction. The temperature of the reaction mixture is kept at 20 ° C. by using an alcohol bath cooled with dry ice.
[0026]
The supply of the catalyst is completed in 10 minutes, and 30 minutes after the start of the catalyst supply, the temperature of the reaction mixture is lowered to 5 ° C., and the reaction is carried out after 2 hours. After completion of the polymerization, methanol was added to the reaction mixture to stop the polymerization reaction. The obtained reaction mixture was washed 5 times with a large amount of water, and then the solvent and unreacted monomers were distilled off under reduced pressure using an evaporator to obtain an isopropenyltoluene / isopropenylphenol copolymer. The polymerization conditions (monomer supply ratio, catalyst amount, resin composition, yield) at this time are shown in Table 1, and the resin physical properties (softening point, hue, melting) of the obtained isopropenyltoluene / isopropenylphenol copolymer Viscosity, molecular weight, molecular weight distribution) were measured. The results are shown in Table 2.
[0027]
Comparative Example 1
Into a 1 L four-necked flask equipped with a stirrer, a thermometer, and a vent pipe with a condenser, 200 g of isopropenyl toluene and 200 g of dehydrated and purified toluene are charged and stirred well. The uniformly dispersed mixture is cooled to 5 ° C. by using an alcohol bath cooled with dry ice. On the other hand, in a 25 mL dropping funnel for supplying catalyst, 0.4 g of boron trifluoride phenolate complex (1.7 equivalents of phenol) and dehydrated and purified toluene in a nitrogen atmosphere were added 10 times the amount of the catalyst. Is attached to a 1 L 4-neck flask. Thereafter, the catalyst is gradually supplied to the reactor to start the reaction. The temperature of the reaction mixture is maintained at 5 ° C. by using an alcohol bath cooled with dry ice. The supply of the catalyst is completed in 10 minutes, and the reaction is carried out after 2 hours while keeping the temperature at 5 ° C. After completion of the polymerization, 1N NaOH aqueous solution was added to the reaction mixture to stop the polymerization reaction. The obtained reaction mixture was washed 5 times with a large amount of water, and then the solvent and unreacted monomers were distilled off under reduced pressure using an evaporator to obtain a homopolymer of isopropenyltoluene. The polymerization conditions (monomer supply ratio, catalyst amount, resin composition, yield) at this time are shown in Table 1, and the resin physical properties (hue, softening point, molecular weight, molecular weight distribution, isopropenyltoluene homopolymer) Melt viscosity) was measured. The results are shown in Table 2.
[0028]
Comparative Example 2
Into a 1 L four-necked flask equipped with a stirrer, a thermometer, and a vent pipe with a condenser, 200 g of isopropenyl toluene and 200 g of dehydrated and purified toluene are charged and stirred well. The uniformly dispersed mixture is cooled to 5 ° C. by using an alcohol bath cooled with dry ice. On the other hand, in a 25 mL dropping funnel for supplying catalyst, 0.6 g of boron trifluoride phenolate complex (phenol 1.6 times equivalent) and dehydrated toluene in a nitrogen atmosphere were added 10 times the amount of the catalyst. Is attached to a 1 L 4-neck flask. Thereafter, the catalyst is gradually supplied to the reactor to start the reaction. The temperature of the reaction mixture is maintained at 5 ° C. by using an alcohol bath cooled with dry ice. The supply of the catalyst is completed in 10 minutes, and the reaction is carried out after 2 hours while keeping the temperature at 5 ° C. After completion of the polymerization, 1N NaOH aqueous solution was added to the reaction mixture to stop the polymerization reaction. The obtained reaction mixture was washed 5 times with a large amount of water, and then the solvent and unreacted monomers were distilled off under reduced pressure using an evaporator to obtain a homopolymer of isopropenyltoluene. The polymerization conditions (monomer supply ratio, catalyst amount, resin composition, yield) at this time are shown in Table 1, and the resin properties (softening point, hue, melt viscosity, molecular weight, isopropenyltoluene homopolymer) Molecular weight distribution) was measured. The results are shown in Table 2.
[0029]
[Table 1]
Figure 0003835950
[0030]
[Table 2]
Figure 0003835950
[0031]
<Preparation of acrylic adhesive and evaluation of adhesive strength>
Evaluation was performed as follows.
Adhesive appearance: Visually classified into three stages of ○ to Δ to ×.
○: Transparent Δ: Partly turbid ×: Turbidity Adhesive strength: Measured by a 180 ° peel test.
[0032]
Example 2
The acrylic polymer synthesized in Reference Example 1 and the hydrocarbon resin polymerized in Example 1 were mixed at a solid content ratio of 90/10, and after sufficient stirring, Coronate L (polyisocyanate compound: Nippon Polyurethane Co., Ltd.) 2.7 parts) was added to make an acrylic adhesive. The appearance of the adhesive was transparent.
The adhesive was applied onto a PET film having a thickness of 40 μm so that the film thickness after drying was 30 μm, and dried at 80 ° C. for 5 minutes to prepare an adhesive tape. This adhesive tape was applied to a PET film under a pressure of 500 g as a sample, and the adhesive strength was measured. The results are shown in Table 3.
[0033]
Example 3
An adhesive was prepared in the same manner as in Example 2 except that the acrylic polymer synthesized in Reference Example 2 was used, and the adhesive strength was measured. The results are shown in Table 3.
[0034]
Comparative Examples 3-6
An adhesive was prepared in the same manner as in Example 2 except that the acrylic polymer synthesized in Reference Examples 1 and 2 and the hydrocarbon resin polymerized in Comparative Examples 1 and 2 were used, and the adhesive strength was measured. The results are shown in Table 3.
[0035]
[Table 3]
Figure 0003835950

Claims (2)

下記一般式(I)で表されるスチレン系モノマーと、下記一般式(II)で表されるフェノール系モノマーとの共重合体であり、
(A)(I)/(II)のモル比が99/1〜50/50であり、
(B)重量平均分子量が200〜3000であり、
(C)分子量分布Mw/Mnが1.5以下である
ことを特徴とする炭化水素樹脂。
Figure 0003835950
Figure 0003835950
〔式中、R5、R6及びR7は同一でも異なっていてもよく、水素原子または炭素数4以下のアルキル基である。〕
A copolymer of a styrene monomer represented by the following general formula (I) and a phenol monomer represented by the following general formula (II):
(A) The molar ratio of (I) / (II) is 99/1 to 50/50,
(B) The weight average molecular weight is 200 to 3000,
(C) A hydrocarbon resin having a molecular weight distribution Mw / Mn of 1.5 or less.
Figure 0003835950
Figure 0003835950
[Wherein, R 5 , R 6 and R 7 may be the same or different and are a hydrogen atom or an alkyl group having 4 or less carbon atoms. ]
一般式(II)で表されるフェノール系モノマーがイソプロペニルフェノールであることを特徴とする、請求項1記載の炭化水素樹脂。The hydrocarbon resin according to claim 1, wherein the phenolic monomer represented by the general formula (II) is isopropenylphenol.
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