JPH089709B2 - Method for producing solvent-based natural rubber adhesive - Google Patents
Method for producing solvent-based natural rubber adhesiveInfo
- Publication number
- JPH089709B2 JPH089709B2 JP2304710A JP30471090A JPH089709B2 JP H089709 B2 JPH089709 B2 JP H089709B2 JP 2304710 A JP2304710 A JP 2304710A JP 30471090 A JP30471090 A JP 30471090A JP H089709 B2 JPH089709 B2 JP H089709B2
- Authority
- JP
- Japan
- Prior art keywords
- natural rubber
- solvent
- weight
- tackifying resin
- dissolving
- 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
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、溶剤型天然ゴム系粘着剤の製造方法に関
し、更に詳しくは、溶剤への溶解時間が大幅に短縮さ
れ、生産性の改善された溶剤型天然ゴム系粘着剤の製造
方法に関する。TECHNICAL FIELD The present invention relates to a method for producing a solvent-type natural rubber-based pressure-sensitive adhesive, and more specifically, the dissolution time in a solvent is significantly shortened to improve productivity. The present invention also relates to a method for producing a solvent-based natural rubber adhesive.
天然ゴム系粘着剤は、通常、天然ゴムに、粘着付与樹
脂、軟化剤、老化防止剤、充填剤などの各種成分と混合
し、溶剤型で用いられている。この溶剤型天然ゴム系粘
着剤は、原料をヘキサン、ヘプタン、トルエンなどの有
機溶剤に溶解し、グラビア、リバース、ドクターなどの
塗工方式で基材に塗布後、溶剤を飛散させて粘着テープ
としている。The natural rubber-based pressure-sensitive adhesive is usually used as a solvent type by mixing natural rubber with various components such as a tackifying resin, a softening agent, an antiaging agent, and a filler. This solvent-based natural rubber-based pressure-sensitive adhesive is prepared by dissolving the raw material in an organic solvent such as hexane, heptane, or toluene, applying it to the base material by a coating method such as gravure, reverse, or doctor, and then scattering the solvent to form an adhesive tape. There is.
従来、溶剤型天然ゴム系粘着材の溶解工程において、
溶剤に、天然ゴム、粘着付与樹脂、軟化剤等の原料成分
を溶解させる際には、予め規定数量に計量した溶剤中
に、天然ゴム、粘着付与樹脂、軟化剤等をそれぞれ規定
数量計量して、順次投入し、十数時間から数十時間攪拌
した後に、塗布可能な粘着剤を得ていた。Conventionally, in the process of dissolving solvent-based natural rubber adhesive,
When dissolving raw material components such as natural rubber, tackifying resin, softening agent, etc. in a solvent, measure the specified amount of natural rubber, tackifying resin, softening agent, etc. in a solvent that has been weighed in a specified amount in advance. Then, the adhesive was applied sequentially, and after stirring for a few dozen hours to a few dozen hours, a coatable adhesive was obtained.
このように、従来技術においては、塗布可能な粘着剤
溶液、即ち、設計通りの粘着剤溶液濃度および塗布方法
に適合した粘着剤溶液粘度を有する粘着剤溶液を得るに
は、十数時間から数十時間という長時間の攪拌・溶解時
間が必要であり、生産性がきわめて低い。しかしなが
ら、従来、原料成分の溶解工程時間を短縮する有効な方
法は提案されていない。Thus, in the prior art, in order to obtain an adhesive solution that can be applied, that is, an adhesive solution having an adhesive solution concentration as designed and an adhesive solution viscosity suitable for the application method, a dozen hours to several hours are required. It requires a long stirring and dissolution time of 10 hours, resulting in extremely low productivity. However, heretofore, no effective method has been proposed for shortening the time for dissolving the raw material components.
本発明の目的は、溶剤型天然ゴム系粘着剤の製造工程
において、原料成分の溶剤への攪拌・溶解時間を短縮す
ることにより、粘着剤の生産性を向上させた製造方法を
提供することにある。An object of the present invention is to provide a production method in which the productivity of the pressure-sensitive adhesive is improved by shortening the stirring / dissolving time of the raw material components in the solvent in the production process of the solvent-type natural rubber-based pressure-sensitive adhesive. is there.
本発明者は、前記従来技術の有する問題点を克服する
ために鋭意研究した結果、天然ゴムの素練り作業の際
に、粘着付与樹脂の一部または全部を混練りし、このブ
レンド物を残余の成分とともに溶剤に溶解させることに
より、攪拌・溶解時間を大幅に短縮できることを見出
し、その知見に基づいて本発明を完成するに至った。The present inventor, as a result of diligent research for overcoming the problems of the above-mentioned prior art, kneaded part or all of the tackifying resin during mastication of natural rubber, leaving the blended product as a residue. It was found that the stirring / dissolving time can be significantly shortened by dissolving it in a solvent together with the above-mentioned component, and the present invention has been completed based on the finding.
かくして本発明によれば、溶剤型天然ゴム系粘着剤を
構成する原料成分の溶剤への溶解工程において、天然ゴ
ムと少なくとも一部の粘着付与樹脂とを予め混練りした
混合物を残余の原料成分とともに溶剤に溶解させること
を特徴とする溶剤型天然ゴム系粘着剤の製造方法が提供
される。Thus, according to the present invention, in the step of dissolving the raw material components constituting the solvent-type natural rubber-based pressure-sensitive adhesive in the solvent, a mixture obtained by previously kneading the natural rubber and at least a part of the tackifying resin together with the remaining raw material components Disclosed is a method for producing a solvent-based natural rubber-based pressure-sensitive adhesive, which is characterized by being dissolved in a solvent.
以下、本発明について詳述する。 Hereinafter, the present invention will be described in detail.
前記したとおり、一般に溶剤型天然ゴム系粘着剤の撹
拌・溶解工程では、予め規定数量に計量した溶剤中に、
天然ゴム、粘着付与樹脂、軟化剤等の粘着剤構成成分
(原料成分)を規定数量計量して順次投入し、攪拌・溶
解する手法が用いられている。As described above, generally, in the stirring / dissolving step of the solvent-type natural rubber-based pressure-sensitive adhesive, the solvent is preliminarily measured in a specified quantity,
A method is used in which a specified amount of a pressure-sensitive adhesive constituent component (raw material component) such as natural rubber, a tackifying resin, and a softening agent is sequentially measured, and then stirred and dissolved.
ところで、天然ゴムの分子量は、通常100万以上と大
きく、そのままでは塗工性や粘着特性などが不十分なた
め、適度の分子量に調整し、かつ、分子量を安定化させ
る必要がある。その目的で一般に素練り作業が行なわれ
る。素練りにより、天然ゴムの主鎖の切断とともに、そ
の網目構造を破壊し、分子量を低下させ、塗工性や粘着
付与樹脂との混和性が改良される。本発明においては、
この素練り作業の際に、粘着付与樹脂の規定数量の少な
くとも1部を添加・混練し、得られた天然ゴム−粘着付
与樹脂混合物を他の残余の原料成分とともに溶剤中に溶
解させる。By the way, since the molecular weight of natural rubber is usually as large as 1,000,000 or more and the coating properties and adhesive properties are insufficient as it is, it is necessary to adjust the molecular weight to an appropriate level and stabilize the molecular weight. For that purpose, mastication work is generally performed. Mastication breaks the main chain of natural rubber, destroys its network structure, lowers the molecular weight, and improves coatability and miscibility with a tackifying resin. In the present invention,
During this mastication operation, at least one part of the specified amount of tackifying resin is added and kneaded, and the obtained natural rubber-tackifying resin mixture is dissolved in the solvent together with the other remaining raw material components.
混練り作業における各成分の混合割合は、天然ゴム10
0重量部に対して、粘着付与樹脂を通常1〜100重量部、
好ましくは1〜50重量部とする。粘着付与樹脂の混合割
合が過小であると、原料成分の攪拌・溶解工程の時間を
短縮する効果が少なく、逆に、過大であると、天然ゴム
−粘着付与樹脂混合物の可塑化が進み、ブロッキングに
より操作性が低下する。The mixing ratio of each component in the kneading work is 10% natural rubber.
With respect to 0 parts by weight, the tackifying resin is usually 1 to 100 parts by weight,
It is preferably 1 to 50 parts by weight. If the mixing ratio of the tackifying resin is too small, there is little effect of shortening the time of the stirring / dissolving step of the raw material components, and conversely, if it is too large, the plasticization of the natural rubber-tackifying resin mixture proceeds and blocking occurs. This reduces the operability.
天然ゴムへの付着付与樹脂の添加・混練りは、通常、
素練りに使用されるロール機もしくはバンバリー型ミキ
サー等で行なうことが可能であるが、計量管理上からは
密閉型のバンバリー型ミキサーが好ましい。Addition and kneading of adhesion-giving resin to natural rubber is usually
It can be carried out by a roll machine or a Banbury mixer used for mastication, but a closed Banbury mixer is preferable from the viewpoint of measurement control.
かくして得られた天然ゴム−粘着付与樹脂混合物は、
溶剤に対する溶解性が天然ゴム単独の場合よりも高くな
るため、塗布可能な粘着剤を得るまでの撹拌・溶解時間
の短縮が可能となる。The natural rubber-tackifying resin mixture thus obtained is
Since the solubility in a solvent is higher than in the case of using natural rubber alone, it is possible to shorten the stirring / dissolving time until obtaining a coatable adhesive.
粘着付与樹脂としては、汎用のものが使用でき、特に
限定されないが、例えば、ロジン系、クマロン−インデ
ン系、テルペン系、石油系、スチレン系、フェノール
系、キシレン系などを挙げることができる。これらの中
でも、天然ゴムとの組み合わせにおいて相溶性の高い天
然のロジン系あるいはテルペン系のものが好ましい。As the tackifier resin, a general-purpose resin can be used and is not particularly limited, and examples thereof include rosin-based, coumarone-indene-based, terpene-based, petroleum-based, styrene-based, phenol-based, and xylene-based resins. Among these, a natural rosin-based or terpene-based compound having high compatibility in combination with natural rubber is preferable.
軟化剤としては、例えば、ポリブテン、ポリイソブチ
レン、ポリイソプレン、プロセスオイル、ナフテン系オ
イルなどを挙げることができる。Examples of the softening agent include polybutene, polyisobutylene, polyisoprene, process oil, and naphthenic oil.
老化防止剤としては、汎用のフェノール系、アミン系
安定剤が好ましい。As the antiaging agent, general-purpose phenol-based and amine-based stabilizers are preferable.
充填剤としては、チタン白、亜鉛華、炭酸カルシウ
ム、クレー、タルク、顔料、カーボンブラックなどを例
示することができる。Examples of the filler include titanium white, zinc white, calcium carbonate, clay, talc, pigment, carbon black and the like.
架橋剤としては、チウラム系、フェノール系、イソシ
アネート系などを用いることができる。As the cross-linking agent, thiuram-based, phenol-based, isocyanate-based, etc. can be used.
これらの原料成分は、使用目的に応じて適宜選択して
用いる。ただし、本発明の溶剤型天然ゴム系粘着剤にお
いては、天然ゴムと粘着付与樹脂を必須成分として含有
することが必要である。These raw material components are appropriately selected and used according to the purpose of use. However, in the solvent-based natural rubber-based pressure-sensitive adhesive of the present invention, it is necessary to contain natural rubber and tackifying resin as essential components.
ここで、粘着剤の標準的な構成例を示せば、次のとお
りである。Here, a standard configuration example of the adhesive is as follows.
天然ゴム:100重量部 粘着付与樹脂:60〜120重量 軟化剤:0〜30重量部 老化防止剤:1〜3重量部 溶剤としては、一般に使用されているノルマルヘキサ
ン、ヘプタン、トルエン、トリクレン、ゴム用揮発油な
どの有機溶剤が用いられる。Natural rubber: 100 parts by weight Tackifying resin: 60 to 120 parts by weight Softener: 0 to 30 parts by weight Anti-aging agent: 1 to 3 parts by weight As a solvent, normal hexane, heptane, toluene, trichlene, rubber An organic solvent such as volatile oil is used.
攪拌・溶解は、原料成分を溶剤中に投入し、プロペラ
式、反転式、ニーダー型など種々のタイプのミキサーに
より攪拌しながら溶解させる。均一な溶解が完了したか
否かについては、溶液の濃度および溶液粘度が一定値
(平衡値)に達したか否かで判定することができる。For stirring and dissolving, the raw material components are put into a solvent and dissolved with stirring by various types of mixers such as a propeller type, an inversion type and a kneader type. Whether or not the uniform dissolution is completed can be determined by whether or not the concentration and solution viscosity of the solution have reached a certain value (equilibrium value).
以下に実施例および比較例を挙げて本発明について更
に具体的に説明する。Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.
[実施例1] 天然ゴム(TPC 1X:天然ゴムの国際規格)100重量部
に対してて、粘着付与樹脂(YSレジンPX#1150:安原樹
脂製)10重量部を30cm×61cmのオープンロールにて混練
りして得られた天然ゴムの重量平均分子量が93万、数平
均分子量が43万の天然ゴム−粘着付与樹脂混合物と、粘
着付与樹脂(YSレジンPX1150:安原樹脂製)70重量部を
溶剤(ノルマルヘキサン)720重量部に溶解した。[Example 1] 10 parts by weight of tackifying resin (YS resin PX # 1150: made by Yasuhara Resin) was added to 100 parts by weight of natural rubber (TPC 1X: international standard of natural rubber) in an open roll of 30 cm x 61 cm. The natural rubber obtained by kneading and kneading was mixed with a natural rubber-tackifying resin mixture having a weight average molecular weight of 930,000 and a number average molecular weight of 430,000 and 70 parts by weight of a tackifying resin (YS resin PX1150: Yasuhara resin). It was dissolved in 720 parts by weight of a solvent (normal hexane).
攪拌・溶解は、サタケ社製の200タンクで、攪拌機
サタケ社製A−540,0.2Bにより、攪拌条件150rpmで行な
った(以下同様)。Stirring / dissolving was carried out in a 200-tank tank manufactured by Satake Co., using a stirrer A-540, 0.2B manufactured by Satake Co. under stirring conditions of 150 rpm (the same applies hereinafter).
[実施例2] 天然ゴム(TPC 1X)100重量部に対して、粘着付与樹
脂(YSレジンPX#1150:安原樹脂製)50重量部を容量70
のバンバリーミキサーにて混練りして得られた天然ゴ
ムの重量平均分子量が95万、数平均分子量が44万の天然
ゴム−粘着付与樹脂混合物と、粘着付与樹脂(YSレジン
PX1150:安原樹脂製)30重量部を溶剤(ノルマルヘキサ
ン)720重量部に溶解した。[Example 2] To 100 parts by weight of natural rubber (TPC 1X), 50 parts by weight of a tackifying resin (YS resin PX # 1150: made by Yasuhara Resin) was added to a volume of 70.
Natural rubber obtained by kneading with a Banbury mixer of 950,000 having a weight average molecular weight of 950,000 and a number average molecular weight of 440,000-a tackifying resin mixture and a tackifying resin (YS resin
30 parts by weight of PX1150: Yasuhara resin) was dissolved in 720 parts by weight of a solvent (normal hexane).
[比較例1] 天然ゴム(TPC 1X)100重量部および粘着付与樹脂
(YSレジンPX#1150:安原樹脂製)80重量部を溶剤(ノ
ルマルヘキサン)720重量部に溶解した。天然ゴムの重
量平均分子量は94万、数平均分子量は44万であった。Comparative Example 1 100 parts by weight of natural rubber (TPC 1X) and 80 parts by weight of tackifying resin (YS resin PX # 1150: made by Yasuhara Resin) were dissolved in 720 parts by weight of a solvent (normal hexane). The weight average molecular weight of natural rubber was 940,000 and the number average molecular weight was 440,000.
これらの結果を第1表に示す。 The results are shown in Table 1.
第1表の結果から、粘着剤溶液の濃度と粘度は、実施
例1では、12時間で平衡値に達し、実施例2では8時間
で平衡値に達している。 From the results shown in Table 1, the concentration and viscosity of the pressure-sensitive adhesive solution reach the equilibrium value in 12 hours in Example 1 and reach the equilibrium value in 8 hours in Example 2.
これに対して、原料成分をそれぞれ溶剤中に溶解させ
た比較例1では、約16時間の撹拌・溶解時間を必要とし
ている。On the other hand, in Comparative Example 1 in which the raw material components were dissolved in the solvent, about 16 hours of stirring and dissolving time were required.
このように、比較例1と比べて実施例1の場合で攪拌
・溶解時間は2/3に、実施例2の場合では1/2となり、生
産性はそれぞれ1.5倍、2倍と改善されている。As described above, compared with Comparative Example 1, the stirring / dissolving time was 2/3 in the case of Example 1 and 1/2 in the case of Example 2, and the productivity was improved by 1.5 times and 2 times, respectively. There is.
本発明により、溶剤型天然ゴム系粘着剤の攪拌・溶解
時間の大幅な短縮が可能となり、粘着剤の生産性を向上
させることができる。According to the present invention, the stirring / dissolving time of the solvent-type natural rubber-based pressure-sensitive adhesive can be significantly shortened, and the productivity of the pressure-sensitive adhesive can be improved.
Claims (1)
分の溶剤への溶解工程において、天然ゴムと少なくとも
一部の粘着付与樹脂とを予め混練りした混合物を残余の
顔料成分とともに溶剤に溶解させることを特徴とする溶
剤型天然ゴム系粘着剤の製造方法。1. In a step of dissolving a raw material component constituting a solvent-type natural rubber-based pressure-sensitive adhesive in a solvent, a mixture obtained by previously kneading natural rubber and at least a part of a tackifier resin is used as a solvent together with the remaining pigment component. A method for producing a solvent-based natural rubber-based pressure-sensitive adhesive, which comprises dissolving.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2304710A JPH089709B2 (en) | 1990-11-09 | 1990-11-09 | Method for producing solvent-based natural rubber adhesive |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2304710A JPH089709B2 (en) | 1990-11-09 | 1990-11-09 | Method for producing solvent-based natural rubber adhesive |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04178480A JPH04178480A (en) | 1992-06-25 |
JPH089709B2 true JPH089709B2 (en) | 1996-01-31 |
Family
ID=17936280
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2304710A Expired - Lifetime JPH089709B2 (en) | 1990-11-09 | 1990-11-09 | Method for producing solvent-based natural rubber adhesive |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH089709B2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000080338A (en) * | 1998-06-23 | 2000-03-21 | Nitto Denko Corp | Rubber-based pressure-sensitive adhesive and self- adhesive sheet using same |
ITTO20030764A1 (en) * | 2003-10-01 | 2005-04-02 | Maris Flli Spa | PERFECT PROCESS OF CONTINUOUS PRODUCTION OF |
CN109181636A (en) * | 2018-08-15 | 2019-01-11 | 佛山市南海骏驰新材料有限公司 | A kind of overlay film packaging glue and its production technology |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2708192A (en) * | 1952-05-21 | 1955-05-10 | Minnesota Mining & Mfg | Method of making adhesive composition containing a diene rubber and a phenolic resin |
JPS61238879A (en) * | 1985-04-16 | 1986-10-24 | Ii D Ee:Kk | Underwater adhesive |
-
1990
- 1990-11-09 JP JP2304710A patent/JPH089709B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH04178480A (en) | 1992-06-25 |
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