TW202346520A - 用於ｐｅｔ之洗除型壓敏性黏著劑 - Google Patents
用於ｐｅｔ之洗除型壓敏性黏著劑 Download PDFInfo
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- TW202346520A TW202346520A TW112114549A TW112114549A TW202346520A TW 202346520 A TW202346520 A TW 202346520A TW 112114549 A TW112114549 A TW 112114549A TW 112114549 A TW112114549 A TW 112114549A TW 202346520 A TW202346520 A TW 202346520A
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- sensitive adhesive
- pressure
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- surfactant
- monomer
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- 239000011734 sodium Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- APSBXTVYXVQYAB-UHFFFAOYSA-M sodium docusate Chemical compound [Na+].CCCCC(CC)COC(=O)CC(S([O-])(=O)=O)C(=O)OCC(CC)CCCC APSBXTVYXVQYAB-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
-
- 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
- C08F220/00—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
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/334—Applications of adhesives in processes or use of adhesives in the form of films or foils as a label
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Laminated Bodies (AREA)
Abstract
本文揭示一種可自基材洗除之壓敏性黏著劑(PSA)。該PSA可包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。一種具有經丙烯酸黏合劑塗佈之基材層且具有PSA層之標籤，其中該PSA層包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。
Description
本揭露係關於一種可自各種基材洗除之壓敏性黏著劑(pressure sensitive adhesive, PSA)。更具體而言，本揭露係關於一種壓敏性黏著劑層，該壓敏性黏著劑層包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。
黏著劑組成物適用於廣泛多種之目的。一種特別有用的黏著劑組成物之子集係水基壓敏性黏著劑。水基壓敏性黏著劑在不同的最終用途應用中之使用係大致上已知的。舉例而言，水基壓敏性黏著劑可與標籤、記事本、膠帶、印花、繃帶、裝飾片及保護片、以及廣泛多種之其他產品一起使用。
如本領域中所使用，用語「壓敏性黏著劑(pressure sensitive adhesive)」表示包含一或多種聚合物組成物之材料，其在乾燥時在各種溫度下強烈且持久地膠黏。此外，用語「水基(water-based)」指示壓敏性黏著劑以水性載劑製造。典型的水基壓敏性黏著劑在僅接觸後而不需要超過手指或手施加之壓力的情況下即會牢固地黏附於各種不同的表面。
壓敏性黏著劑通常用於將紙或膜標籤附接至PET。PET通常可回收，但通常僅在可容易移除PSA的情況下。壓碎仍附接有PSA標籤之PET容器引起加工挑戰及污染。當前，80℃或更高之溫度對於自基材移除標籤係必須的。可在不具有過度熱的情況下自基材（諸如PET）清潔移除之標籤及黏著劑將允許在具有最少後處理之情況下再利用容器。因此，可容易在低溫下洗除之基於PSA之標籤係所欲的。
本揭露係關於一種可自基材洗除之壓敏性黏著劑(PSA)。更具體而言，PSA層包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。
目前揭示一種具有經親水性或疏水性丙烯酸黏合劑塗佈之基材層且具有PSA層之標籤，其中PSA層包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。可選地，用具有Tg大於5℃之丙烯酸黏合劑處理。
根據本揭露，可在小於85攝氏度之溫度下及在7與14之間的pH下使用恆定攪拌浴來移除PSA。
基材層
用於形成洗除型標籤之本發明所揭示之基材層可包含單層基材材料，或可由多層構造形成。用於形成基材層之材料之特性以及標籤之預期用途及所欲之效能特性可判定適當材料及構造用作基材層之選擇。在多層基材之情況下，重要考慮因素係與PSA層接觸之外層的性質。
在多層基材中，並非與PSA接觸之層的一或多個層係受應力基材可係有利的，諸如單軸向或雙軸向拉伸之聚氯乙烯或其他可拉伸基材，其在經受合適的洗除條件時將捲曲且有助於將標籤拉離玻璃或塑膠基材。
廣泛多種之材料可用於形成基材層，包括紙及聚合組成物。材料可塗有底漆或未塗有底漆。材料可係可收縮/可膨脹或不可收縮的。其可係藉由例如電暈放電、火焰、電漿等處理之表面，以提供具有所欲特性之表面，諸如對隨後所施加之層具有改良之黏著性。對聚合基材之電暈處理及火焰處理之程序係所屬技術領域中具有通常知識者所熟知。
基材層可係單層基材或多層基材。多層基材可包含兩個或更多個層。基材層可係定向或未定向的。其可係透明或不透明的。
適用於製備基材層之聚合物可包括例如以下中之一或多者之聚合物及共聚物：聚烯烴、聚丙烯酸酯、聚苯乙烯、聚醯胺、聚乙烯醇、聚(丙烯酸伸烷酯)、聚(乙烯乙烯醇)、聚(伸烷基乙酸乙烯酯)、聚胺甲酸酯、聚丙烯腈、聚酯、聚酯共聚物、氟聚合物、聚碸、聚碳酸酯、苯乙烯-順丁烯二酸酐共聚物、苯乙烯-丙烯腈共聚物、基於乙烯甲基丙烯酸之鈉鹽或鋅鹽的離子聚合物、聚丙烯腈、伸烷基-乙酸乙烯酯共聚物、或所謂的「生物聚合物」，或前述二或更多者之混合物。基材層可包含聚醯胺膜，諸如聚醯胺6、聚醯胺11、及聚醯胺12。
如本發明所揭示，基材層之塑膠基材可不受應力（亦即，未拉伸）或可在至少一個方向上拉伸。在多層基材中，該等層之僅一個或小於所有的層可係單軸向或雙軸向拉伸。在拉伸大於一個層之多層基材的情況下，該等層可全部以基本上相同的定向拉伸，或不同層可以相對於彼此的不同定向拉伸。
如本發明所揭示，基材層或至少承載黏著劑層之多層基材層可在施加黏著劑層之前，例如藉由電暈處理、火焰預處理、電漿預處理、或化學接枝，或藉助於含有例如氯化聚烯烴、氯化橡膠、乙烯/乙酸乙烯酯(EVA)共聚物、氯化聚丙烯、或聚合乙烯/丙烯醯胺共單體之促黏著性中間層處理。基材亦可藉由具有Tg大於5℃之丙烯酸黏合劑處理，該丙烯酸黏合劑可獲自DOW chemical。丙烯酸黏合劑可以0.05至3.0 gsm之速率施加至基材。丙烯酸黏合劑可以0.05至3.0 gsm之速率施加至PET。
PSA層
本發明揭示藉由乾燥水性聚合物分散液形成之PSA層。該分散液之聚合物包含至少一種親水性單體及至少一種疏水性單體。PSA亦包含至少一種中和劑及至少一種界面活性劑。PSA可具有50%至90%之間的疏水性單體、50%至80%之間的疏水性單體、50%至70%之間的疏水性單體、或50%至60%之間的疏水性單體。可接受的疏水性單體之實例包括但不限於丙烯酸烷酯，諸如丙烯酸丁酯、丙烯酸乙基己酯、丙烯酸辛酯、甲基丙烯酸異辛酯、甲基丙烯酸癸酯、甲基丙烯酸異癸酯、甲基丙烯酸月桂酯、甲基丙烯酸十五烷酯、甲基丙烯酸硬脂醯酯、及甲基丙烯酸C
12至C
18烷酯。所有重量百分比均以黏著劑組成物之總重量計。
PSA可具有25%至30%之間的親水性單體、26%至30%之間的親水性單體、27%至30%之間的親水性單體、28%至30%之間的親水性單體、或29%至30%之間的親水性單體。可接受的親水性單體之實例包括但不限於丙烯酸烷酯，諸如丙烯酸乙酯、丙烯酸甲酯、及丙烯酸丙酯、以及丙烯酸、甲基丙烯酸、丙烯酸羥乙酯、甲基丙烯酸羥乙酯、丙烯酸羥丙酯、及甲基丙烯酸羥丙酯。
藉由乳液聚合製備水不溶性乳膠聚合物之水性分散液係本領域中熟知的。乳液聚合之實踐詳細論述於D.C.Blackley, Emulsion Polymerization (Wiley, 1975)及H.Warson, The Applications of Synthetic Resin Emulsions, Chapter 2 (Ernest Benn Ltd., London 1972)中。聚合方法及有用聚合助劑，諸如分散劑、起始劑、鏈轉移劑、及類似物係熟知的，且描述於例如公開之美國專利申請案US2008/0176996中。
可將起始劑引入至水壺中，其中饋入乳化單體混合物。起始劑可經組態以與至少一種單體反應，藉此形成包含單體次單元之乳液聚合物。起始劑可與分散於整個水性介質中之單體反應，直至所有或實質上所有單體聚合。最終結果可係聚合物粒子於水性介質中之分散液，該等聚合物粒子包含單體次單元。此分散液通常稱為乳液聚合物。在所有單體經饋入至乳化聚合物之後，可將額外的氧化-還原起始劑引入至乳化聚合物，以便減少單體殘餘量。
由至少一種通常係無機的還原劑及無機或有機氧化劑組成之還原-氧化（氧化還原）起始劑系統尤其適合。氧化組分可包含例如過氧化二硫酸之銨鹽及鹼金屬鹽，例如過氧化二硫酸鈉、過氧化氫、或有機過氧化物，例如氫過氧化三級丁基或氫過氧化三級戊基。還原組分可包含例如亞硫酸之鹼金屬鹽，諸如亞硫酸鈉、亞硫酸氫鈉；焦亞硫酸(disulfurous acid)之鹼金屬鹽，諸如焦亞硫酸鈉；亞硫酸氫鹽與脂族醛及酮之加成化合物，諸如丙酮亞硫酸氫鹽；或還原劑，諸如羥基甲烷亞磺酸及其鹽Bruggolite
®FF6，或異抗壞血酸。氧化還原起始劑系統可連同可溶性金屬化合物一起使用，其中金屬組分能夠以複數個價態存在。
常見氧化還原起始劑系統之實例係氫過氧化三級丁基/亞硫酸氫鈉、氫過氧化三級丁基/異抗壞血酸及氫過氧化三級丁基/羥甲烷亞磺酸鈉。單獨的組分，例如還原組分，亦可係混合物，例如羥基甲烷亞磺酸之鈉鹽與焦亞硫酸鈉之混合物。
分散於整個水性介質中之乳液聚合物在聚合之後，可在添加劑後藉由脂肪醇醚硫酸鈉鹽界面活性劑而穩定。脂肪醇醚硫酸鈉鹽界面活性劑可佔組成物之至少0.5%。脂肪醇醚硫酸鈉鹽界面活性劑可佔組成物之0.5%至3%。脂肪醇醚硫酸鈉鹽界面活性劑可佔組成物之1.0%至1.3%。脂肪醇醚硫酸鈉鹽界面活性劑可佔組成物之1.0%至3%。適合的脂肪醇醚硫酸鈉鹽界面活性劑之實例包括但不限於Disponil
®FES 77、FES 32、FES 993、及FES 61，其全部皆可購自BASF。亦可以可選地添加其他塗層添加劑。
磺基丁二酸二辛酯鈉(Aerosol
®OT-75)及乙炔二醇環氧乙烷/環氧丙烷加成物界面活性劑亦可添加至組成物。磺基丁二酸二辛酯鈉可佔組成物之0.1%至3.0%。磺基丁二酸二辛酯鈉可佔組成物之0.2%至0.5%。磺基丁二酸二辛酯鈉可佔組成物之0.2%至1.5%。乙炔二醇環氧乙烷/環氧丙烷加成物界面活性劑可佔組成物之0.05%至1.5%。乙炔二醇環氧乙烷/環氧丙烷加成物界面活性劑可佔組成物之0.1%至0.5%。可接受的乙炔二醇環氧乙烷/環氧丙烷加成物界面活性劑包括但不限於SURFYNOL
®440、SURFYNOL
®104、SURFYNOL
®420、SURFYNOL
®450、SURFYNOL
®465、及SURFYNOL
®485。Aerosol
®OT-75可購自Solvay，而SURFYNOL
®界面活性劑可購自Evonik。乙炔二醇環氧乙烷/環氧丙烷加成物界面活性劑可用非離子支鏈二級醇乙氧基化物界面活性劑置換或與其組合。
可選地，用以改善洗除效能之水溶性添加劑可與聚合物主鏈組合使用。水溶性添加劑之實例係合成水溶性聚合物，諸如聚乙二醇(PEG)、聚乙烯吡咯啶酮(PVP)、聚(乙烯醇)(PVOH)、聚丙烯酸(PAA)、聚丙烯醯胺、N-(2-羥丙基)甲基丙烯醯胺(HPMA)、二乙烯醚-馬來酸酐(DIVEMA)、聚口咢唑啉、聚磷酸鹽、聚磷腈；天然水溶性聚合物，諸如三仙膠、果膠、幾丁聚糖衍生物、右旋糖酐、鹿角菜膠、瓜爾膠、纖維素醚、玻尿酸(HA)、白蛋白、澱粉或基於澱粉之衍生物、或其組合。在洗滌台中洗除標籤期間，諸如聚乙二醇(PEG)及聚乙烯吡咯啶酮(PVP)之聚合物的水溶性及親水性允許黏著劑相對快速地與洗滌液體形成完整表面接觸，促進洗滌液體穿透至標籤後面，且在大約幾分鐘之預定洗滌時間內實現標籤之洗除。水溶性添加劑之實例包括具有不同分子量之PEG 400、PEG 600、PEG1000、PEG1450、PEG3350、PEG8000、PVP K60、PVP K90。水溶性添加劑之濃度及分子量需要平衡洗除效能、黏著性(PSA)特性、黏度、乾燥黏著劑透明度、乳液穩定性、固體量%、流變性、及最終產品調配物可塗佈性。舉例而言，活性水溶性添加劑之濃度可在0.05%至20%範圍內。較佳地，係0.25至10%。
目前揭示之PSA不含有有效量之任何交聯組分，不含有有效量之任何增黏劑或其他添加劑。目前揭示之PSA不含有有效量之己二酸二醯肼(ADH)或蠟。目前揭示之PSA不含有有效量之聚羥基官能性胺。目前揭示之PSA不含有有效量之光可交聯單體。目前揭示之PSA亦不含有有效量之乙酸乙烯酯或乙酸乙烯酯衍生物。
目前揭示一種標籤，其包含基材層及壓敏性黏著劑層，其中親水性或疏水性丙烯酸黏合劑可選地施加於該基材層之黏著劑側上，且壓敏性黏著劑層包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。可選地，用具有Tg大於5℃之丙烯酸黏合劑處理。
親水性丙烯酸黏合劑可以0.05至3.0 gsm之速率施加至基材。親水性丙烯酸黏合劑可以0.05至3.0-gsm之速率施加至基材。
PSA黏著劑及任何所附接標籤可藉由以下方式移除：將經PSA塗佈之基材削片且將薄片浸沒於處於pH 12至14下且維持於小於80℃之溫度下且不斷地攪拌之氫氧化鈉溶液中。攪拌速度可係至少100 rpm。在標籤與PET分離後，浮動的標籤部分及沈降的PET部分可藉由過濾分離。
實例
乳液混合物通常如下製備：向配備有冷凝器、機械攪拌器、溫度受控熱電偶以及起始劑及單體之入口的四公升五頸反應器中饋入418 g的去離子(「deionized, DI」)水且在平緩氮氣流下加熱到90℃至92℃。在單獨的容器中，藉由將242 g DI水、36.63 g Aerosol A-102、26.4 g Siponate DS-4、3.3g氫氧化鈉與1,938.14 g由71 wt%之丙烯酸2-乙基己酯(「2-EHA」)、26 wt%之丙烯酸乙酯(「EA」)及3 wt%之丙烯酸(「AA」)構成的單體混合物混合來製備單體乳液。接下來，將1.88 g碳酸鈉及10.78 g過硫酸鈉（「NaPS」作為起始劑）於33 g DI水中之混合物溶液添加至反應器中，隨後添加15.4g之250 nm大小的疏水性聚合種子及80至100 nm大小的親水性聚合種子，總共46.2g沖洗水。在兩種聚合種子添加後，立即將單體乳液饋入至反應器中。連同7.92g過硫酸鈉於96.8g水中之共進料溶液，進料進行150分鐘，同時將反應溫度保持在85C至87C。一旦將60%之單體乳液饋入至反應器中，即將26.84g之40至60 nm親水性種子裝入反應器中，隨後裝入11g水沖洗液。在完成單體乳液添加後，將反應混合物保持15分鐘，使溫度在80至86℃範圍內緩慢移動。在保持後，將0.019g之FeSO
4-7H
2O及0.075g之42%硝酸銅之溶液添加至反應器中作為氧化還原追加促進劑(redox chase promoter)。仍保持溫度在80至86℃下，逐漸添加兩種追加溶液，一種係由7.7g氫過氧化三級丁基(70%) (「t-BHP」)、3.52 g Disponil Fes於40.37 g DI水中構成之溶液，且另一種係2.2 g D(-)-異抗壞血酸(IAA)於90.2 g DI水中之溶液，將此兩種追加溶液歷經總共45分鐘經由兩次分開的進料饋入至反應器中。在此等進料中十五分鐘，開始冷卻斜變，以歷經60分鐘使反應冷卻至55℃。在追加進料結束後十五分鐘，將0.44g碘酸鉀於12.1g水中之溶液添加至反應器中作為除生物劑穩定劑。一旦反應溫度達到或低於55℃，即歷經10分鐘添加12.32g氨(28%)中和劑將反應之pH調整至4至4.5。接著將9.9 g Surfynol 440、41.38 g Disponil Fes-77、及15.95 g Aerosol OT-75於86.46g水中之混合物作為後添加調配物(post add formulation)歷經30 min添加至批料中。在將反應冷卻至室溫後，歷經30分鐘添加192.17g之10% NaOH溶液以中和批料至pH 7.5至8.5。在溫度＜45℃下，添加除生物劑包。接著經由100目過濾器過濾所獲得之丙烯酸分散液。所獲得之丙烯酸分散液包括由71 wt% 2-EHA、26 wt% EA、及3 wt% AA構成之丙烯酸類聚合物，且具有-40C之玻璃轉移溫度，其中固體量在57%至59%之間。重量百分比係按丙烯酸類聚合物之總乾重計。
樣本調節及標籤層壓
將所製備之完全調配的濕樣本在測試之前調節至少24小時，以確保不存在氣泡且產物有時間平衡。在24小時後，藉由移液管將濕黏著劑樣本施加至矽化紙或膜，且如表1所示，使用刮刀塗佈技術以18 g/m
2乾燥黏著劑塗層重量塗佈。將經塗佈黏著劑樣本在105℃下在對流烘箱中乾燥兩分鐘，且接著在50% +/- 5%濕度及21℃+/- 2℃下調節約四小時。在此調節時段之後，使用熱輥層壓機在40℃及40 atm壓力下將矽化紙或膜上之黏著劑層壓至（理想上經預處理）雙軸定向聚丙烯基材(biaxial oriented polypropylene, BOPP)上。接著將12 kg重量置放於完全組裝之層壓體上至少四天。對於用具有Tg大於5℃之丙烯酸黏合劑處理的樣本，以2 g/m
2施加塗層且接著在70℃下乾燥BOPP基材兩分鐘。
PSA特性測試程序
使用Féderation Internationale des fabricants et transformateurs d' Adhésifs et Thermocollants (「FINAT
™」)測試方法第2號來測試PSA的剝離黏著力。在機器方向條帶中自25 mm寬及至少175 mm長移除背襯材料，且將塗佈黏著劑之覆面材料固定至測試盤。將測試盤固定至水平支撐件中，該水平支撐件固定於測試器之底部鉗口。機器設定為300 mm/分鐘鉗口分離速率(jaw separation rate)，並且機器負載平均函數設定成平均資料。
根據標準玻璃表面測試之剪切阻力係使用FINAT
™測試方法第8號進行。將25×25 mm樣本條帶在2°之垂直傾角下附接至玻璃盤。測量1 kg重量使條帶之黏著劑膜內部碎裂所用的時間。
洗除測試程序
使用歐洲PET瓶平台(EPBP
™) Quick Test (QT) 508程序測試標籤之可洗性。此程序係由塑膠回收公司所使用之當前工業程序的小規模模擬程序。將樣本浸入80℃或65℃1% NaOH溶液中，藉由磁性攪拌器攪拌至350 rpm。洗滌塑膠薄片小於15分鐘。可選地，添加0.5%之非離子界面活性劑二級醇乙氧基化物之溶液，以更好地將黏著劑粒子分散於液體中且能夠實現更好的塑膠薄片過濾。
下表1中之所有發明樣本含有0.5%至2.0%脂肪醇醚硫酸鈉鹽、＞2%乙炔二醇環氧乙烷/環氧丙烷加成物、及＞2%磺基丁二酸二辛酯鈉。將所有樣本中和至約7.6的乳膠pH，具有約61.1%固體量，2420 cP之第2水平@12黏度、及1764 cP之第3水平@30黏度。如下表中所示。
表1：比較實例及發明實例之組成
表2：比較樣本及發明樣本之表徵
| 乾燥黏著劑塗層重量(gsm) | 中和劑 | 丙烯酸黏合劑 | 脂肪醇醚硫酸鈉鹽 | 乙炔二醇環氧乙烷/環氧丙烷加成物 | 磺基丁二酸二辛酯鈉 | 非離子界面活性劑/二級醇乙氧基化物 | |
| CE 1 | 18 | 氨 | 無 | 0 | 0.3 | 0.5 | 0 |
| IE 1 | 18 | NaOH | 丙烯酸黏合劑 | 1.3 | 0.3 | 0.5 | 0 |
| IE 1 | 18 | NaOH | 丙烯酸黏合劑 | 1.3 | 0.3 | 0.5 | 0 |
| IE 2 | 18 | NaOH | 丙烯酸黏合劑 | 1.3 | 0.3 | 0.5 | 0 |
| IE 2 | 18 | NaOH | 丙烯酸黏合劑 | 1.3 | 0.3 | 0.5 | 0 |
| IE 3 | 18 | NaOH | 丙烯酸黏合劑 | 1.3 | 0.3 | 0.3 | 0.3 |
| IE 3 | 18 | NaOH | 丙烯酸黏合劑 | 1.3 | 0.3 | 0.3 | 0.3 |
| 丙烯酸黏合劑 | FTM9：玻璃環形膠 [N/吋] | FTM2： 90°剝離黏著力 – 20 min玻璃[N/吋] | FTM2： 90°剝離黏著力 – 24 h玻璃[N/吋] | FTM2： 90°剝離黏著力 – 20 min HDPE [N/吋] | FTM2： 90°剝離黏著力 – 24 h HDPE [N/吋] | FTM8：剪切阻力（玻璃） | 洗除% | |
| 比較 | 無 | 5.8 | 4.9 | 6.4 | 4.2 | 4.6 | 48 | 10 |
| IE 1 | 丙烯酸黏合劑 | 5.8 | 4.7 | 10.2 | 2.9 | 3.2 | 33 | 50-81 |
| IE 1 | 丙烯酸黏合劑 | 7.7 | 4.6 | 20.7 | 3.1 | 3.5 | 18 | 80 |
| IE 2 | 丙烯酸黏合劑 | 7.2 | 4.5 | 11.7 | 2.3 | 2.8 | 33 | 15 |
| IE 2 | 丙烯酸黏合劑 | 8.1 | 5.1 | 9.6 | 3.0 | 3.3 | 20 | 75 |
| IE 3 | 丙烯酸黏合劑 | 7.0 | 4.6 | 9.6 | 2.8 | 2.9 | 39 | 20 |
| IE 3 | 丙烯酸黏合劑 | 6.8 | 4.9 | 10.3 | 2.6 | 2.7 | 21 | 100 |
無
無
Claims (12)
- 一種壓敏性黏著劑層，其包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。
- 如請求項1之壓敏性黏著劑，其中該至少一種親水性單體係該組成物之至少20%，且該至少一種疏水性單體係該組成物之至少50%。
- 如前述請求項中任一項之壓敏性黏著劑，其中該至少一種親水性單體係由(甲基)丙烯酸乙酯及(甲基)丙烯酸組成之群組中之一或多者。
- 如前述請求項中任一項之壓敏性黏著劑，其中該至少一種疏水性單體係丙烯酸烷酯。
- 如前述請求項中任一項之壓敏性黏著劑，其中該至少一種中和劑係NaOH。
- 如前述請求項中任一項之壓敏性黏著劑，其中該至少一種界面活性劑係脂肪醇醚硫酸鈉鹽。
- 如前述請求項中任一項之壓敏性黏著劑，其中該至少一種界面活性劑係該組成物之至少0.5%。
- 如前述請求項中任一項之壓敏性黏著劑，其不進一步包含有效量之乙酸乙烯酯或乙酸乙烯酯衍生物。
- 如前述請求項中任一項之壓敏性黏著劑，其不進一步包含有效量之增黏劑。
- 一種包含基材及壓敏性黏著劑層之標籤，其中該壓敏性黏著劑包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑。
- 如請求項10之標籤，其中具有Tg大於5℃之丙烯酸黏合劑經施加至該基材。
- 如請求項10或11之標籤，其中該基材係由玻璃、聚醯胺、聚苯乙烯、PET、LDPE、LLDPE、PP、或HDPEA組成之群組中之一者，標籤洗除程序包含獲得具有標籤之物品，該標籤包含基材層及壓敏性黏著劑層；該壓敏性黏著劑層包含至少一種親水性單體、至少一種疏水性單體、至少一種中和劑、及至少一種界面活性劑；可選地，用具有Tg大於15℃之丙烯酸黏合劑處理；在小於85℃之溫度下及在7與14之間的pH下用恆定攪拌洗滌該物品，以移除該標籤。
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