JP4374843B2 - Aromatic petroleum resin composition for hot melt adhesive - Google Patents

Aromatic petroleum resin composition for hot melt adhesive Download PDF

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Publication number
JP4374843B2
JP4374843B2 JP2002323519A JP2002323519A JP4374843B2 JP 4374843 B2 JP4374843 B2 JP 4374843B2 JP 2002323519 A JP2002323519 A JP 2002323519A JP 2002323519 A JP2002323519 A JP 2002323519A JP 4374843 B2 JP4374843 B2 JP 4374843B2
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Japan
Prior art keywords
petroleum resin
aromatic petroleum
resin composition
hot melt
melt adhesive
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JP2002323519A
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JP2004155925A (en
Inventor
晃幸 服部
博明 堀江
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Tosoh Corp
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Tosoh Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、加熱安定性の良好なホットメルト接着剤用芳香族石油樹脂組成物に関するものである。
【0002】
【従来の技術】
芳香族石油樹脂は、分子中に共役二重結合や第三級炭素位やアリル位等の酸化されやすい化学構造を有している。そのため、空気中の酸素により自動酸化を受けてフリーラジカルを発生して、芳香族石油樹脂の劣化が起こる(例えば、非特許文献1参照)。特にホットメルト接着剤は、高温に曝されるため、熱劣化を受けやすく、配合時や接着剤製造時に皮張りや沈殿物を生じアプリケータノズルをつまらせて問題となる。
【0003】
そこで、従来、石油樹脂の安定剤として、ヒンダードフェノール系酸化防止剤、リン系酸化防止剤、チオエーテル系酸化防止剤、アミン系酸化防止剤等が用いられている(例えば、非特許文献2参照)。
【0004】
しかしながら従来の酸化防止剤は、ラジカルを補足する一次酸化防止剤と過酸化物を分解する二次酸化防止剤を併用して用いないと効果が発現しにくいという課題を有していた。
【0005】
一方、脂肪酸アミドはポリエチレン、ポリプロピレン、塩化ビニル、硬化ABS、ポリスチレン樹脂の平滑剤及びアンチブロッキング剤等として一般的には用いられ、石油樹脂の添加剤としては全く知られていなかった。
【0006】
【非特許文献1】
三好民雄著「接着」高分子刊行会出版、1985年6月25日発行、第250〜257頁
【非特許文献2】
林田隆博著「接着の技術」日本接着学会出版、2000年9月30日発行、第25〜32頁
【0007】
【発明が解決しようとする課題】
本発明の目的は、ホットメルト接着剤の用途で使用される際、加熱安定性の優れるホットメルト接着剤用芳香族石油樹脂組成物を提供することである。
【0008】
【課題を解決するための手段】
本発明者らは、前記課題を解決すべく新規な芳香族石油樹脂の添加剤について鋭意検討した結果、本発明を完成するに至った。
【0009】
すなわち、本発明は、芳香族石油樹脂100重量部に対して脂肪酸アミドを0.01〜1.0重量部配合して成ることを特徴とするホットメルト接着剤用芳香族石油樹脂組成物に関するものである。
【0010】
以下、本発明について詳細に説明する。
本発明における芳香族石油樹脂は、その原料油として石油類の熱分解により得られる分解油のうち沸点範囲が140〜280℃の範囲にある留分、例えばスチレン、そのアルキル誘導体であるα−メチルスチレンやβ−メチルスチレン、ビニルトルエン、インデン及びそのアルキル誘導体、ジシクロペンタジエン及びその誘導体等を、フリーデル・クラフト型触媒により単独重合、或いは共重合して得られる。
通常は重合後にさらにアルカリで触媒を分解し、次いで未反応油及び低重合物を除去することにより本発明で使用する芳香族石油樹脂とする。
【0011】
本発明において使用される脂肪酸アミドは、植物油や動物油等に含まれる脂肪酸或いはその混合物をアミド化したもの指す。具体的にはラウリン酸アミド、ミリスチン酸アミド、バルミチン酸アミド、ステアリン酸アミド等の飽和脂肪族アミド、オレイン酸アミド、リノール酸アミド、リノレン酸アミド、エレオスチアリン酸アミド等の不飽和脂肪族アミド等が挙げられ、単独又は混合物として用いられる。中でも融点が60〜180℃の脂肪酸アミドが配合し易いため好ましい。
【0012】
本発明における脂肪酸アミドの配合量は、芳香族石油樹脂100重量部に対し0.01〜1.0重量部、好ましくは0.05〜0.5重量部である。0.01重量部より少ない場合は加熱安定性の改良効果が低く、1.0重量部を超えると芳香族石油樹脂に溶解できないため効果の向上がなく、沈殿物が生じて問題となる。
【0013】
本発明における脂肪酸アミドの添加方法は、特に限定されず、任意の方法によって得られる。具体例としては、重合後の未反応油及び低重合物を除去する前の溶融樹脂に添加する方法、芳香族石油樹脂と脂肪酸アミドを加熱して溶融混練する方法等がある。
【0014】
本発明のホットメルト接着剤用芳香族石油樹脂組成物は、脂肪族アミド以外に、酸化防止剤、着色剤(顔料、染料)、紫外線吸収剤等が添加されてもよい。上記酸化防止剤としては、例えば、ヒンダードフェノール系、ヒンダードアミン系、リン系、イオウ系等の公知の酸化防止剤が挙げられ、これらは単独で用いられてもよく、二種類以上が併用されてもよい。
【0015】
本発明のホットメルト接着剤用芳香族石油樹脂組成物を用いてなるホットメルト接着剤は、エチレン系共重合体、ホットメルト接着剤用芳香族石油樹脂組成物及びワックスからなる。
【0016】
本発明のホットメルト接着剤用芳香族石油樹脂組成物を用いてなるホットメルト接着剤で使用されるエチレン系共重合体は、接着剤の柔軟性の点からエチレン・酢酸ビニル共重合体(以下、EVAという)が好ましい。さらに接着性の点から、酢酸ビニル含有量が20〜50重量%、メルトインデックス(以下、MIという)が10〜2000g/10分であるEVAが好ましい。ここでMIとは、ASTM D−1238−89に準拠し、温度190℃、荷重2160g、時間10分間の条件で測定した時の単位時間あたりの流出したグラム数(g/10分)を意味する。
【0017】
本発明のホットメルト接着剤用芳香族石油樹脂組成物を用いてなるホットメルト接着剤で使用されるワックスとしては、パラフィンワックス、マイクロクリスタリンワックス等の石油ワックス、ポリエチレンワックス、フィッシャートロプシュワックス、ポリプロピレンワックス、アタクチックポリプロピレン等の合成ワックス、木ロウ、カルナバワックス、ミツロウ等の天然ワックス等が挙げられ、単独又は混合物として用いられる。
【0018】
本発明のホットメルト接着剤用芳香族石油樹脂組成物を用いてなるホットメルト接着剤の配合は、エチレン系共重合体30〜80重量%好ましくは30〜50重量%、芳香族石油樹脂と脂肪族アミドとの混合物(以下、芳香族石油樹脂組成物という)15〜60重量%好ましくは20〜50重量%、ワックス5〜40重量%好ましくは5〜30重量%の量で存在することが、接着性及び塗工作業性の点で好適である。ワックスが5重量%未満のときはセットタイムが長くなり、ホットメルト接着剤の特徴である作業性の良さを損ない、40重量%を超えると接着力が低下する。
【0019】
本発明のホットメルト接着剤用芳香族石油樹脂組成物を用いてなるホットメルト接着剤には必要に応じ、顔料、染料、酸化防止剤、滑剤、耐候剤、ブロッキング防止剤、各種安定剤、無機充填剤を配合することができる。
【0020】
本発明のホットメルト接着剤用芳香族石油樹脂組成物の製造方法は、公知の方法、即ち各配合成分を溶融下で混合することにより製造することが出来る。本製造方法における溶融温度は特に制限はないが、溶融攪拌が困難になる極端に低い温度、或いは配合物が溶融、或いは流動しない低温でなければ特に問題はない。一方、高温ではEVAの分解、或いは粘着付与樹脂によっては着色するものがあり好ましくない。これらのことを勘案すると、160〜230℃が好ましく、更に好ましくは180〜200℃である。混合方法は公知であり、押出機、オープンロールミル、バンバリーミキサー、ニーダー、ニーダールーダー、溶融混合槽等を用いることが出来る。
【0021】
【実施例】
以下、本発明を実施例により説明するが、本発明はこれらの実施例により何ら制限を受けるものではない。尚、実施例、比較例において用いた原料樹脂、配合物、組成物の調製、分析、試験法は下記の通りである。
1.原料
(1)EVA
東ソー株式会社製、ウルトラセン720(酢酸ビニル含有量=28重量%、MI=150g/10分)、ウルトラセン0B54B(酢酸ビニル含有量=33重量%、MI=400g/10分)
(2)芳香族石油樹脂組成物 :実施例に記載した条件により製造した芳香族石油樹脂と脂肪族アミドとの混合物のことであり、実施例中では組成物(A)、組成物(C)が該当する。
(3)ワックス
パラフィンワックス(日本精蝋社製、パラフィンワックス155F)、フィッシャートロプッシュワックス(シューマンサゾール社製、パラフリントH1)
(4)酸化防止剤;フェノール系酸化防止剤(チバガイギー製、Irganox1010)
2.ホットメルト接着剤用芳香族石油樹脂組成物の調製方法
EVA 100部、芳香族石油樹脂組成物(芳香族石油樹脂と脂肪族アミドとの混合物)100部、パラフィンワックス155F 25部、パラフリントH125部を500mlのテフロン(登録商標)ビーカーに入れ、180℃に保温したオーブンに入れ、内容物を完全に溶融させた後、十分に攪拌・混合を行い、冷却してホットメルト接着剤用芳香族石油樹脂組成物のサンプルを調製した。
3.分析方法
(1)原料油の各成分の含有量:通常のガスクロマトグラフ法を用いて分析した。
(2)重量平均分子量:ポリスチレンを標準物質としゲル浸透クロマトグラフィーにより測定した。
4.試験方法
(1)加熱安定性試験
上記2.で得られたホットメルト接着剤50gを180℃のギアオーブンに入れ、24時間毎に試料表面を観察する。ゲル、炭化物等の熱劣化物が最初に発見された時間を加熱劣化時間とした。
【0022】
実施例1
石油類の熱分解により得られる分解油のうち、スチレン、ビニルトルエン(o−,m−,p−)、インデンの合計量に対するインデンの含有率が40重量%(スチレン含有率19重量%,ビニルトルエン含有率41重量%、モノマー含有率50重量%)である沸点範囲が140〜280℃の範囲にある留分100重量部に、フリーデル・クラフト型触媒として三沸化硼素フェノール錯体(ステラケミファ(株)三フッ化ホウ素フェノール)を0.5重量%加えて60℃で2時間重合した後、苛性ソーダ水溶液で触媒を除去した。その後、油相にステアリン酸アミド(日本油脂(株)アルフロー S−10)0.2重量%を添加・溶解させた後、未反応油を蒸留して芳香族石油樹脂組成物(A)を得た。この樹脂組成物(A)の軟化点は119℃、色相5、重量平均分子量(Mw)は1,340であった。
【0023】
得られた樹脂組成物(A)とEVA(東ソー(株)製:ウルトラセン720)を用いてホットメルト接着剤用芳香族石油樹脂組成物の調製方法に則ってホットメルト接着剤用芳香族石油樹脂組成物を配合して、加熱安定性を評価し、これらの結果を表1に示した。
【0024】
【表1】

Figure 0004374843
実施例2
実施例1で調製した芳香族石油樹脂組成物(A)とEVA(東ソー(株)製:ウルトラセン0B54B)を用いた以外は、実施例1と同様にホットメルト接着剤用芳香族石油樹脂組成物を配合し、加熱安定性の評価を行い、これらの結果を表1に示した。
【0025】
比較例1
ステアリン酸アミドを用いないで、実施例1と同様の原料、製造方法で芳香族石油樹脂(B)を調製した。実施例1と同様にホットメルト接着剤用芳香族石油樹脂組成物を配合して加熱安定性を評価し、これらの結果を表1に示した。
【0026】
比較例2
酸化防止剤1重量部を加える以外は比較例1と同様の配合でホットメルト接着剤用芳香族石油樹脂組成物を調製して、加熱安定性を評価し、これらの結果を表1に示した。
【0027】
実施例3
実施例1と同じ条件で重合を行った。その後、苛性ソーダ水溶液で触媒を除去し、油相にステアリン酸アミド(日本油脂(株)アルフロー S−10)0.2重量%を添加・溶解させた後、未反応油を蒸留して芳香族石油樹脂組成物(C)を得た。この樹脂組成物(C)の軟化点は132℃、色相7,重量平均分子量(Mw)は1,120であった。
【0028】
得られた樹脂組成物(C)とEVA(東ソー(株)製:ウルトラセン720)を用いてホットメルト接着剤用芳香族石油樹脂組成物の調製方法に則ってホットメルト接着剤用芳香族石油樹脂組成物を配合して、加熱安定性を評価し、これらの結果を表1に示した。
【0029】
実施例4
実施例3で調製した芳香族石油樹脂組成物(C)とEVA(東ソー(株)製:ウルトラセン0B54B)を用いた以外は、実施例3と同様にホットメルト接着剤用芳香族石油樹脂組成物を配合し、加熱安定性の評価を行い、これらの結果を表1に示した。
【0030】
比較例3
ステアリン酸アミドを用いないで、実施例3と同様の原料、製造方法で芳香族石油樹脂(D)を調製した。実施例1と同様にホットメルト接着剤用芳香族石油樹脂組成物の加熱安定性を評価し、これらの結果を表1に示した。
【0031】
【発明の効果】
以上、示されたように本発明のホットメルト接着剤用芳香族石油樹脂組成物は、加熱安定性に優れたホットメルト接着剤を提供することが出来る。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aromatic petroleum resin composition for hot melt adhesives having good heat stability.
[0002]
[Prior art]
Aromatic petroleum resins have chemical structures such as conjugated double bonds, tertiary carbon positions, and allylic positions that are easily oxidized in the molecule. Therefore, it undergoes auto-oxidation by oxygen in the air to generate free radicals, which causes degradation of the aromatic petroleum resin (see Non-Patent Document 1, for example). In particular, hot melt adhesives are subject to thermal degradation because they are exposed to high temperatures, causing skinning and precipitation during compounding and adhesive production, which causes problems with the applicator nozzle being pinched.
[0003]
Therefore, conventionally, as a stabilizer for petroleum resin, a hindered phenol-based antioxidant, a phosphorus-based antioxidant, a thioether-based antioxidant, an amine-based antioxidant, or the like is used (for example, see Non-Patent Document 2). ).
[0004]
However, the conventional antioxidant has a problem that the effect is hardly exhibited unless a primary antioxidant that captures radicals and a secondary antioxidant that decomposes peroxide are used in combination.
[0005]
On the other hand, fatty acid amides are generally used as polyethylene, polypropylene, vinyl chloride, hardened ABS, polystyrene resin smoothing agents, antiblocking agents, and the like, and have never been known as petroleum resin additives.
[0006]
[Non-Patent Document 1]
Tamio Miyoshi, “Adhesion”, published by Kobunshi Publishing Co., Ltd., published on June 25, 1985, pp. 250-257 [Non-patent Document 2]
Takahiro Hayashida, “Technology of Adhesion”, published by the Adhesion Society of Japan, published on September 30, 2000, pages 25-32.
[Problems to be solved by the invention]
An object of the present invention is to provide an aromatic petroleum resin composition for a hot melt adhesive which is excellent in heat stability when used in a hot melt adhesive application.
[0008]
[Means for Solving the Problems]
As a result of intensive studies on novel aromatic petroleum resin additives to solve the above problems, the present inventors have completed the present invention.
[0009]
That is, the present invention relates to an aromatic petroleum resin composition for hot melt adhesives, characterized in that 0.01 to 1.0 part by weight of a fatty acid amide is blended with 100 parts by weight of an aromatic petroleum resin. It is.
[0010]
Hereinafter, the present invention will be described in detail.
The aromatic petroleum resin in the present invention is a fraction having a boiling point in the range of 140 to 280 ° C. among cracked oil obtained by thermal cracking of petroleum as a raw material oil, for example, styrene, α-methyl which is an alkyl derivative thereof. It can be obtained by homopolymerizing or copolymerizing styrene, β-methylstyrene, vinyltoluene, indene and its alkyl derivative, dicyclopentadiene and its derivative, etc. with Friedel-Craft type catalyst.
Usually, after the polymerization, the catalyst is further decomposed with an alkali, and then the unreacted oil and the low polymer are removed to obtain the aromatic petroleum resin used in the present invention.
[0011]
The fatty acid amide used in the present invention refers to an amidated fatty acid or a mixture thereof contained in vegetable oil, animal oil or the like. Specifically, saturated aliphatic amides such as lauric acid amide, myristic acid amide, valmitic acid amide, stearic acid amide, unsaturated aliphatic amides such as oleic acid amide, linoleic acid amide, linolenic acid amide, and eleostia phosphoric acid amide Etc., and are used alone or as a mixture. Among these, a fatty acid amide having a melting point of 60 to 180 ° C. is preferable because it is easy to mix.
[0012]
The compounding quantity of the fatty acid amide in this invention is 0.01-1.0 weight part with respect to 100 weight part of aromatic petroleum resins, Preferably it is 0.05-0.5 weight part. When the amount is less than 0.01 part by weight, the effect of improving the heat stability is low, and when the amount exceeds 1.0 part by weight, the effect cannot be improved because it cannot be dissolved in the aromatic petroleum resin, and a precipitate is generated, resulting in a problem.
[0013]
The method for adding the fatty acid amide in the present invention is not particularly limited, and can be obtained by any method. Specific examples include a method of adding to a molten resin before removing unreacted oil and low polymer after polymerization, a method of heating and kneading an aromatic petroleum resin and a fatty acid amide, and the like.
[0014]
The aromatic petroleum resin composition for hot melt adhesives of the present invention may contain an antioxidant, a colorant (pigment, dye), an ultraviolet absorber and the like in addition to the aliphatic amide. Examples of the antioxidant include known antioxidants such as hindered phenols, hindered amines, phosphorus and sulfur, and these may be used alone or in combination of two or more. Also good.
[0015]
The hot melt adhesive comprising the aromatic petroleum resin composition for hot melt adhesive of the present invention comprises an ethylene copolymer, an aromatic petroleum resin composition for hot melt adhesive, and a wax.
[0016]
The ethylene-based copolymer used in the hot-melt adhesive comprising the aromatic petroleum resin composition for hot-melt adhesive of the present invention is an ethylene / vinyl acetate copolymer (hereinafter referred to as “ethylene / vinyl acetate copolymer”). And EVA). Further, from the viewpoint of adhesiveness, EVA having a vinyl acetate content of 20 to 50% by weight and a melt index (hereinafter referred to as MI) of 10 to 2000 g / 10 minutes is preferable. Here, MI means the number of grams (g / 10 minutes) that flowed out per unit time when measured under conditions of a temperature of 190 ° C., a load of 2160 g, and a time of 10 minutes in accordance with ASTM D-1238-89. .
[0017]
Examples of the wax used in the hot melt adhesive comprising the aromatic petroleum resin composition for hot melt adhesive of the present invention include petroleum waxes such as paraffin wax and microcrystalline wax, polyethylene wax, Fischer-Tropsch wax, and polypropylene wax. Synthetic waxes such as atactic polypropylene, natural waxes such as wood wax, carnauba wax, and beeswax, etc., may be used alone or as a mixture.
[0018]
The blending of the hot melt adhesive comprising the aromatic petroleum resin composition for hot melt adhesive of the present invention comprises 30 to 80% by weight, preferably 30 to 50% by weight of an ethylene copolymer, and the aromatic petroleum resin and fat. A mixture with a group amide (hereinafter referred to as an aromatic petroleum resin composition) is present in an amount of 15 to 60% by weight, preferably 20 to 50% by weight, wax 5 to 40% by weight, preferably 5 to 30% by weight, It is suitable in terms of adhesiveness and coating workability. When the wax is less than 5% by weight, the set time becomes long, and the good workability characteristic of the hot melt adhesive is impaired. When the wax exceeds 40% by weight, the adhesive strength is lowered.
[0019]
The hot-melt adhesive comprising the aromatic petroleum resin composition for hot-melt adhesives of the present invention includes pigments, dyes, antioxidants, lubricants, weathering agents, anti-blocking agents, various stabilizers, inorganics as necessary. A filler can be blended.
[0020]
The manufacturing method of the aromatic petroleum resin composition for hot-melt adhesives of the present invention can be manufactured by a known method, that is, by mixing each compounding component under melting. The melting temperature in this production method is not particularly limited, but there is no particular problem unless it is an extremely low temperature at which melt stirring becomes difficult, or a low temperature at which the compound does not melt or flow. On the other hand, at high temperatures, EVA is decomposed or colored depending on the tackifying resin, which is not preferable. Considering these things, 160-230 degreeC is preferable, More preferably, it is 180-200 degreeC. The mixing method is known, and an extruder, an open roll mill, a Banbury mixer, a kneader, a kneader ruder, a melt mixing tank, and the like can be used.
[0021]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention, this invention does not receive a restriction | limiting at all by these Examples. In addition, preparation, analysis, and test methods of raw material resins, blends, and compositions used in Examples and Comparative Examples are as follows.
1. Raw material (1) EVA
Manufactured by Tosoh Corporation, Ultrasen 720 (vinyl acetate content = 28 wt%, MI = 150 g / 10 min), Ultrasen 0B54B (vinyl acetate content = 33 wt%, MI = 400 g / 10 min)
(2) Aromatic petroleum resin composition: A mixture of an aromatic petroleum resin and an aliphatic amide produced according to the conditions described in the examples. In the examples, the composition (A) and the composition (C) Is applicable.
(3) Wax paraffin wax (manufactured by Nippon Seiwa Co., Ltd., paraffin wax 155F), Fischer Tropus wax (manufactured by Schumann Sazol, Paraflint H1)
(4) Antioxidant: Phenol type antioxidant (Irganox 1010, manufactured by Ciba Geigy)
2. Preparation of EVA petroleum resin composition for hot melt adhesive 100 parts EVA, 100 parts aromatic petroleum resin composition (mixture of aromatic petroleum resin and aliphatic amide), 25 parts paraffin wax 155F, 125 parts paraflint H Is placed in a 500 ml Teflon (registered trademark) beaker and placed in an oven kept at 180 ° C., and after the contents are completely melted, the mixture is sufficiently stirred and mixed, cooled and cooled for aromatic petroleum for hot melt adhesive. A sample of the resin composition was prepared.
3. Analysis method (1) Content of each component of raw material oil: Analysis was performed using a normal gas chromatographic method.
(2) Weight average molecular weight: Measured by gel permeation chromatography using polystyrene as a standard substance.
4). Test method (1) Heat stability test 50 g of the hot melt adhesive obtained in the above is put in a gear oven at 180 ° C., and the sample surface is observed every 24 hours. The time at which a thermally deteriorated material such as gel or carbide was first discovered was defined as the heat deterioration time.
[0022]
Example 1
Among the cracked oils obtained by pyrolysis of petroleum, the content of indene is 40% by weight (styrene content 19% by weight, vinyl, based on the total amount of styrene, vinyltoluene (o-, m-, p-), and indene. 100 parts by weight of a fraction having a boiling point range of 140 to 280 ° C. having a toluene content of 41% by weight and a monomer content of 50% by weight was used as a Friedel-Craft type catalyst as a boron trifluoride phenol complex (Stella Chemifa). After adding 0.5% by weight of boron trifluoride phenol) and polymerizing at 60 ° C. for 2 hours, the catalyst was removed with an aqueous caustic soda solution. Thereafter, 0.2 wt% of stearamide (Nippon Yushi Co., Ltd. Alflow S-10) was added to and dissolved in the oil phase, and then the unreacted oil was distilled to obtain an aromatic petroleum resin composition (A). It was. This resin composition (A) had a softening point of 119 ° C., a hue of 5, and a weight average molecular weight (Mw) of 1,340.
[0023]
Aromatic petroleum for hot melt adhesive using the obtained resin composition (A) and EVA (manufactured by Tosoh Corporation: Ultrasen 720) according to the method for preparing an aromatic petroleum resin composition for hot melt adhesive The resin composition was blended to evaluate the heat stability, and the results are shown in Table 1.
[0024]
[Table 1]
Figure 0004374843
Example 2
Aromatic petroleum resin composition for hot melt adhesive as in Example 1 except that the aromatic petroleum resin composition (A) prepared in Example 1 and EVA (manufactured by Tosoh Corporation: Ultrasen 0B54B) were used. The product was blended and the heat stability was evaluated. The results are shown in Table 1.
[0025]
Comparative Example 1
An aromatic petroleum resin (B) was prepared by the same raw material and production method as in Example 1 without using stearamide. In the same manner as in Example 1, an aromatic petroleum resin composition for a hot-melt adhesive was blended to evaluate the heat stability, and the results are shown in Table 1.
[0026]
Comparative Example 2
An aromatic petroleum resin composition for hot melt adhesive was prepared with the same composition as Comparative Example 1 except that 1 part by weight of antioxidant was added, and the heat stability was evaluated. The results are shown in Table 1. .
[0027]
Example 3
Polymerization was carried out under the same conditions as in Example 1. Thereafter, the catalyst is removed with an aqueous caustic soda solution, and 0.2% by weight of stearamide (Nippon Yushi Co., Ltd., Alfro S-10) is added to and dissolved in the oil phase. A resin composition (C) was obtained. The resin composition (C) had a softening point of 132 ° C., a hue of 7, and a weight average molecular weight (Mw) of 1,120.
[0028]
Using the obtained resin composition (C) and EVA (manufactured by Tosoh Corporation: Ultrasen 720), an aromatic petroleum resin for hot melt adhesive is prepared in accordance with a method for preparing an aromatic petroleum resin composition for hot melt adhesive. The resin composition was blended to evaluate the heat stability, and the results are shown in Table 1.
[0029]
Example 4
Aromatic petroleum resin composition for hot melt adhesive as in Example 3, except that the aromatic petroleum resin composition (C) prepared in Example 3 and EVA (manufactured by Tosoh Corporation: Ultrasen 0B54B) were used. The product was blended and the heat stability was evaluated. The results are shown in Table 1.
[0030]
Comparative Example 3
An aromatic petroleum resin (D) was prepared by the same raw material and production method as in Example 3 without using stearic acid amide. The heat stability of the aromatic petroleum resin composition for hot melt adhesive was evaluated in the same manner as in Example 1, and the results are shown in Table 1.
[0031]
【The invention's effect】
As described above, the aromatic petroleum resin composition for hot melt adhesive of the present invention as described above can provide a hot melt adhesive excellent in heat stability.

Claims (2)

芳香族石油樹脂100重量部に対して脂肪酸アミドを0.01〜1.0重量部配合して成ることを特徴とするホットメルト接着剤用芳香族石油樹脂組成物。An aromatic petroleum resin composition for a hot melt adhesive, comprising 0.01 to 1.0 part by weight of a fatty acid amide per 100 parts by weight of an aromatic petroleum resin. 脂肪酸アミドの融点が60〜180℃であることを特徴とする請求項1に記載のホットメルト接着剤用芳香族石油樹脂組成物。The aromatic petroleum resin composition for hot melt adhesives according to claim 1, wherein the fatty acid amide has a melting point of 60 to 180 ° C.
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