TW201716537A - 壓敏性黏合劑組成物及其製備方法 - Google Patents

壓敏性黏合劑組成物及其製備方法 Download PDF

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TW201716537A
TW201716537A TW105124803A TW105124803A TW201716537A TW 201716537 A TW201716537 A TW 201716537A TW 105124803 A TW105124803 A TW 105124803A TW 105124803 A TW105124803 A TW 105124803A TW 201716537 A TW201716537 A TW 201716537A
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忠興 郭
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Abstract

揭露壓敏性黏合劑組成物，其具有增強耐熱性，係藉由(a)一或多種丙烯酸酯或(甲基)丙烯酸酯，(b)一或多種羥基官能性(甲基)丙烯酸系單體，及(c)一或多種以脲基取代之(甲基)丙烯酸酯單體之乳化聚合反應獲得。

Description

壓敏性黏合劑組成物及其製備方法 發明領域
本發明係有關於具有改良耐熱性之壓敏性黏合劑(PSA)。特別地，本發明係有關於具有增強耐熱性之丙烯酸系乳膠PSA。
發明背景
丙烯酸系由於其等之高固體含量、低揮發性有機含量、良好之紫外線(UV)/熱安定性，及高塗覆速度，而被用於使一可撓性材料與一表面結合之許多應用，且被用於，例如，膠帶及標籤產業。於某些應用，特別是於其中耐熱性係所欲之特殊膠帶，溶劑及UV PSA典型上被使用。
丙烯酸系PSA典型上係藉由乳化或溶液聚合反應製造，且乳化聚合反應係較佳。丙烯酸系乳膠PSA之黏著性質係受用於聚合反應方法之單體的型式及相對量影響。
因此，需要具有可與溶劑及UV PSA相比擬之增強耐熱性的丙烯酸系乳膠PSA。
發明概要
於一實施例，提供一種壓敏性黏合劑組成物，其含有一單體混合物之乳化聚反應產物，此單體混合物含有：(a)一或多種丙烯酸酯或(甲基)丙烯酸酯；(b)一或多種羥基官能性(甲基)丙烯酸系單體；(c)一或多種以脲基取代之(甲基)丙烯酸酯單體；(d)選擇性之一或多種烴單體；及(e)選擇性之一或多種乙烯不飽和羧酸。
於另一實施例，提供一種壓敏性黏合劑組成物，其含有一單體混合物之乳化聚合反應產物，此單體混合物含有：(a)等於或大於約50重量%之一或多種丙烯酸酯或(甲基)丙烯酸酯；(b)約0.1至約5重量%之一或多種羥基官能性(甲基)丙烯酸系單體；(c)約0.05至約3重量%之一或多種以脲基取代之(甲基)丙烯酸酯單體；(d)0至約10重量%或0至約3重量%之選擇性之一或多種烴單體；及(e)0至約6重量%之選擇性之一或多種乙烯不飽和羧酸。其中，重量%係以單體混合物之總重量為基準。
於另一實施例，提供一種壓敏性黏合劑組成物，其含有一單體混合物之乳化聚合反應產物，此單體混合物含有：(a)一或多種丙烯酸酯或甲基丙烯酸酯，其係C1-C17之丙烯酸烷酯或甲基丙烯酸烷酯；(b)一或多種羥基官能性(甲基)丙烯酸系單體，其係C1-C17之羥基官能性丙烯酸烷酯或甲基丙烯酸烷酯，或其係自C2-C12羧酸之縮水甘油酯製備之更多丙烯酸酯；及(c)一或多種以脲基取代之(甲基)丙烯酸酯單體，其係C8-C17之脲基丙烯酸烷酯或甲基丙烯酸烷 酯。
發明詳細說明
本發明之PSA組成物係藉由(a)一或多種丙烯酸酸酯或(甲基)丙烯酸酯，(b)一或多種羥基官能性(甲基)丙烯酸系單體，(c)一或多種以脲基取代之(甲基)丙烯酸酯單體，(d)選擇性之一或多種烴單體，及(e)選擇性之一或多種乙烯不飽和羧酸之乳化聚合反應獲得。已發現羥基官能性(甲基)丙烯酸系單體與以脲基取代之(甲基)丙烯酸酯單體之組合產生具有優異之高溫性能的乳膠PSA。
適於本發明之丙烯酸酯或甲基丙烯酸酯，組份(a)，的例子包括C1-C17之丙烯酸烷酯或甲基丙烯酸烷酯。典型例子包括丙烯酸甲酯、甲基丙烯酸甲酯、丙烯酸乙酯、甲基丙烯酸乙酯、丙烯酸異丙酯、甲基丙烯酸異丙酯、丙烯酸正丁酯、甲基丙烯酸正丁酯、丙烯酸異丁酯、甲基丙烯酸異丁酯、丙烯酸第三丁酯、甲基丙烯酸第三丁酯、丙烯酸己酯、甲基丙烯酸己酯、丙烯酸乙基己酯、甲基丙烯酸乙基己酯、甲基丙烯酸3,3二甲基丁酯、丙烯酸月桂酯，及其等之任何組合或子集。
於一實施例，組份(a)包含一或多種丙烯酸酯或(甲基)丙烯酸酯，其均聚物具有少於或等於-20℃之玻璃轉化溫度(Tg)。於另一實施例，組份(a)僅包含一或多種丙烯 酸酯或(甲基)丙烯酸酯，其均聚物具有少於或等於-10℃或少於或等於-20℃或更低之玻璃轉化溫度(Tg)。
以組份(a)-(e)之重量為基準，用於本發明之PSA組成物的單體混合物可包含等於或大於約50重量%，或約50至約99重量%，或約50至約95重量%，或約60至95重量%，或約75至約95重量%，或約75至90重量%之丙烯酸酯或(甲基)丙烯酸酯。於另一實施例，以組份(a)-(e)之重量為基準，用於本發明之PSA組成物的單體混合物包含大於約50重量%，或約60至95重量%，或約75至約95重量%，或約75至90重量%之丙烯酸酯或(甲基)丙烯酸酯，其均聚物具有-20℃或更低之玻璃轉化溫度(Tg)。於另一實施例，丙烯酸酯或(甲基)丙烯酸酯均聚物之Tg係於約-100℃與10℃之間，或於約-70℃至10℃之間，或約-70℃至-10℃之間。
羥基官能性(甲基)丙烯酸系單體，組份(b)，之例子包括C1-C17之羥基官能性丙烯酸烷酯或甲基丙烯酸烷酯。典型例子包括丙烯酸羥基乙酯、甲基丙烯酸羥基乙酯、丙烯酸羥基丙酯、甲基丙烯酸羥基丙酯、丙烯酸羥基丁酯、(甲基)丙烯酸羥基丁酯、丙烯酸羥基己酯、甲基丙烯酸羥基己酯、丙烯酸羥基乙基己酯、甲基丙烯酸羥基乙基己酯，及其等之任何組合或子集。羥基官能性(甲基)丙烯酸酯單體之其它例子包括自C2-C12羧酸之縮水甘油酯製備之丙烯酸酯，例如，可購自Hexion Inc.之ACETM羥基丙烯酸酯單體。
以組份(a)-(e)之重量為基準，用於本發明之PSA組成物的單體混合物可包含約0.1至約5重量%或0.5至約3 重量%之羥基官能性(甲基)丙烯酸系單體。
以脲基取代之(甲基)丙烯酸酯單體，組份(c)，之例子包括C7-C17，較佳係C8-C17之脲基丙烯酸烷酯或甲基丙烯酸烷酯。典型例子包括：2-(2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；2-(1-甲基-2-側氧基咪唑啶-1-鎓-1-基)乙基2-甲基丙-2-烯酸酯；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[2-(2-側氧基咪唑啶-1-基)乙基]銨；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[2-(2-側氧基咪唑啶-1-基)乙基]氯化銨；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[1-(2-側氧基咪唑啶-1-基)乙基]銨；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[1-(2-側氧基咪唑啶-1-基)乙基]氯化銨；2-(4-甲基-2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；1-(2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；2-(2-側氧基咪唑啶-1-基)乙基2-亞甲基丁酸酯；[1-乙醯胺基-2-(2-側氧基咪唑啶-1-基)乙基]2-甲基丙-2-烯酸酯；[2-側氧基-2-[2-(2-側氧基咪唑啶-1-基)乙基胺基]乙基]2-甲基丙-2-烯酸酯；2-(3-甲基-2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；[2-側氧基-2-[2-(2-側氧基咪唑啶-1-基)乙氧基]乙基]2-甲基 丙-2-烯酸酯；[2-側氧基-2-[1-(2-側氧基咪唑啶-1-基)乙基胺基]乙基]2-甲基丙-2-烯酸酯等，包括其等之任何組合或子集。
以組份(a)-(e)之重量為基準，用於本發明之PSA組成物的單體混合物可包含約0.05至約3重量%，或0.1至1重量%，或0.05至0.9重量%之以脲基取代之(甲基)丙烯酸酯單體。
當使用時，適用於本發明之選擇性烴單體，組份(d)，之例子包括苯乙烯化合物(例如，苯乙烯、羧化苯乙烯，及α-甲基苯乙烯)、乙烯、丙烯、丁烯，及共軛二烯類(例如，丁二烯、異戊二烯，及丁二烯與異戊二烯之共聚物)，及其等之任何組合或子集。
當使用時，約5至約10重量%之烴單體。以組份(a)-(e)之重量為基準，用於本發明之PSA組成物的單體混合物可包含。
當使用時，選擇性之乙烯不飽和羧酸，組份(e)，之例子包括單乙烯不飽和單羧酸類，諸如，丙烯酸、甲基丙烯酸、乙基丙烯酸、巴豆酸，及丙烯酸羧乙酯，單乙烯不飽和二羧酸類，諸如，馬來酸、福馬酸、衣康酸，及檸康酸，單乙烯不飽和三羧酸類，諸如，烏頭酸，及此等酸之以鹵素取代之衍生物(例如，α氯丙烯酸)及酐類(例如，馬來酸酐及檸康酸酐)。另外，單體混合物係無乙烯不飽和羧酸類。
當使用時，以組份(a)-(e)之重量為基準，用於本 發明之PSA組成物的單體混合物可包含約0.5至約3重量%之單乙烯不飽和羧酸。
除了上述以外，於另一實施例，用於本發明之PSA組成物的單體混合物可選擇性地包括不同於組份(a)-(e)之另外單體。另外單體的例子包括上述乙烯不飽和羧酸之腈類，諸如，丙烯腈、α氯丙烯腈，及甲基丙烯腈。例子包括此等羧酸之醯胺類，諸如，未經取代之醯胺類(例如，(甲基)丙烯醯胺)，及藉由上述羧酸之醯胺與酫(例如，甲醛)反應獲得之其它α取代丙烯醯胺類及n-取代醯胺類。典型之n-取代醯胺類包括n-羥甲基丙烯醯胺、n-羥甲基甲基丙烯醯胺、烷基化n-羥甲基醯胺類，及n-羥甲基甲基丙烯醯胺類(例如，n-甲氧基甲基丙烯醯胺，及n-甲氧基甲基甲基丙烯醯胺)。當存在時，以組份(a)-(e)之重量為基準，用於本發明之PSA組成物的單體混合物可包含約0.5至約5重量%之單乙烯不飽和羧酸類之腈類及/或醯胺類。
另外單體之例子包括羧酸類之乙烯酯，諸如，C2-C12羧酸之乙烯酯，例如，VeoVaTM 9乙烯酯，或VeoVaTM 10乙烯酯，二者皆可購自Hexion Inc。當存在時，以組份(a)-(e)之重量為基準，本發明之PSA組成物可包含約0.5至約6重量%之羧酸的乙烯酯。
於本發明之另一實施例，製備本發明之分散液的方法可利用一連續相(通常係水)，且可包括此項技熱中標準及已知之其它組份，諸如，起始劑、還原劑、界面活性劑、消泡劑、濕潤劑、交聯劑、防腐劑等。例如，適於乳化聚 合反應之任何傳統的水溶性聚合反應起始劑可被使用。以單體總重量為基準，該等起始劑之典型重量%係從0.01至2.0重量%，且較佳係0.01至約1.0重量%。起始劑之例子不受限地包括過硫酸鹽類、過氧化物類、偶氮化合物類，及此等之混合物。水溶性起始劑可單獨或與一或多種傳統還原劑組合使用，傳統還原劑係不受限地諸如甲醛合次硫酸鈉、偏亞硫酸氫鈉、抗壞血酸、亞鐵鹽類、螯合鐵鹽類等。
於一實施例，水溶性聚合反應起始劑系統係與傳統還原劑組合使用之過氧化物類，諸如，具有螯合鐵錯合物催化劑之以第三丁基過氧化氫甲醛合次硫酸鈉為主之系統。
適合界面活性劑系統之例子係此項技藝已知者，且包括陰離子性、非離子性、陽離子性，或兩性之乳化劑，及此等之混合物。陰離子性界面活性劑之例子不受限地包括烷基硫酸鹽類、乙氧化物醇類之硫酸鹽、芳基磺酸鹽類、乙氧基化醇類之磷酸鹽、乙氧基化烷基酚類之磺基琥珀酸鹽、硫酸鹽，及磺酸鹽，及此等之混合物。非離子性界面活性劑之例子不受限地包括乙氧基化醇類、乙氧基化烷基酚類，及其等之混合物。陽離子性界面活性劑之例子不受限地包括乙氧基化脂肪胺類。於一實施例。具有反應性碳-碳雙鍵之反應性界面活性劑化學品被使用。反應性化學品之例子不受限地包括含有烯基取代基之烷基酚乙氧化物類、聚氧烯-1-(烯丙氧基甲基)烷基醚硫酸鹽化合物、聚(氧-1,2-乙烷二基)之鹽類、α-磺基ω-[1-(羥甲基)-2-(2-丙烯-氧基) 乙氧基](Adeka SR系列，可購自Adeka Corporation)，及其等之混合物或子集。於一實施例，反應性界面活性劑包括一Adeka SR系列之反應性界面活性劑。界面活性劑之典型重量係0.2至5.0重量%，且更佳係1.0至5.0重量%，且最佳係1.0至3.0重量%。界面活性劑係藉由此項技藝熟知之傳統方法使用。於一實施例，製備PSA之方法包括使單體混合物於聚合反應前以界面活性劑系統乳化。
聚合反應後，乳膠乳液之pH以一適合鹼調整，此鹼不受限地包括金屬氫氧化物類、氫氧化銨、胺類，及此等之混合物。pH係調整到至少6.0，且更佳係6.5至9.5，且最佳係7.0至9.0。於一實施例，適合鹼係氫氧化銨。
本發明之PSA乳膠具有典型固體含量。從約30至70%且較佳係40至55%。聚合反應可於用於乳化聚合反應之典型溫度進行。聚合反應較佳係於110℉(43.3℃)至210℉(99℃)之範圍且更佳係130℉(54℃)至190℉(88℃)進行。
依據本發明之PSA組成物可包含另外添加劑以調整PSA組成物之所需性質。例如，增稠劑及或聚烯烴乳膠可被添加以改良諸如不銹鋼及高密度聚乙烯之某些基材上之黏著性質。以PSA組成物之總固體為基準，增稠劑及聚烯烴乳膠可以1至60重量%，較佳係5至40重量%，最佳係10-25重量%固體之量添加。
適合增稠劑可選自以松香酸、松香酯、萜，或烴為主之增稠劑。可購得之例子係Arizona Chemical之Aquatac 6085，Lawter Inc之Snowtack FH95G，Eastman Chemical Company之Tacolyn 1070，及DRT之Dermulsene TR501。
適合聚烯烴乳膠可選自聚乙烯或聚丙烯分散液。聚烯烴可含有酸官能性。可購得之例子係Honeywell之Cohesa 0001，Michelman之Michem Prime 499OR，及陶氏化學公司(The Dow Chemical Company)之Hypod 4501。
為提供本發明之更佳瞭解，包括其代表性優點，提供下列範例。
範例
範例1.(比較)一預乳膠係藉由使231.3克之水，25.4克之Dowfax 2A1(來自Dow)，4.6克之Abex 2535(來自Solvay)，380.4克之丙烯酸2-乙基己酯，270.1克之丙烯酸正丁酯，72.3克之甲基丙烯酸甲酯，22.8克之苯乙烯，及15.2克之2-丙烯酸羥基乙酯混合而形成。二個別溶液被製備：(A)於54.8克之水中的2.3克之過硫酸鈉，及(B)於13.7克之水中的1.5克之過硫酸鈉。349克之水及1.0克之Dowfax 2A1界面活性劑加注至反應器。開始氮氣沖洗，且發生加熱至78℃。於78℃，31克之預乳膠添加至反應器。溶液B被加注至釜內，且以3克之水沖刷。關閉氮氣沖洗，且開始反應放熱。放熱高峰後15分鐘，使來自預乳膠槽之混合物及溶液A流入反應器內持續3.5小時，且反應器溫度控制於85℃。流動完全後，預乳膠以8克之水沖刷，且反應器維持於87℃持續45分鐘，然後冷卻。製備溶液(C)於20克之水中的2.7克之第三丁基過氧化氫，及(D)於16克之水中的1.2克之甲醛合次硫酸鈉。開 始使溶液C及D於45分鐘期間流至反應器，且反應器維持另外15分鐘。反應器冷卻至室溫，且pH以28%氨水溶液調整至6.0-8.0。添加以總重量為基準係1%之氣溶膠OT-75(來自Cytec)，並且混合1小時。
範例2至9使用與範例1相同之方法且以如表1中所述之不同單體組成物製備。
樣品係藉由塗覆於2-密耳(mil)PET膜上，於室溫以空氣乾燥30分鐘，且於一110℃烘箱內乾燥3分鐘，且具有50g/m2之目標乾燥黏合劑塗層重量而測試。經塗覆之PET層合至脫離襯裡。PET/黏合劑/襯裡之結構物切成1-英吋寬之條材，移除脫離襯裡，且具有黏合劑之PET膜層合至不銹鋼(SS)，以作為以方法PSTC-101為基礎之剝離測試，其具有15分鐘及24小時之停滯時間。黏著至測試板後，使其以2kg重之滾輪滾兩次。180度剝離以一Instron測試器以特定滯留時間操作。樣品帶材亦使用方法PSTC-17測試SAFT(剪切黏著失效溫度)。二PSTC方法皆係來自Pressure Sensitive Tape Council(USA)。切割具有6英吋長度之1英吋寬的帶材且於背面以鋁箔帶強化，以避免於高溫剝離。使其以1英吋x 1英吋之接觸面積黏著至不銹鋼板，然後，以2-kg重之滾輪滾兩次。具有此帶材之鋼板被固持於一40℃烘箱內之一架內，使得此板形成178°至180°之角度。一旦具有黏合劑帶材之鋼板被置於烘箱內，使其於止烘箱內停滯30分鐘。然後，使1-kg重量吊掛於帶材上。於吊掛此重量後，立即使烘箱程式化於40℃維持20分鐘。維持20分鐘 後，烘箱溫度以0.5℃/分鐘之速率增加。當烘箱溫度達到200℃，測試完全，且烘箱開始冷卻。當1-kg重量由於鋼板上之試測條材失效而掉落時，溫度被記錄為SAFT。若測試帶材於整個溫度上升期間未失效，SAFT被記錄為200+℃。
結果闡述於表2。
於表1，下列縮寫被使用。
2-EHA：丙烯酸2-乙基己酯
BA：丙烯酸正丁酯
MMA：甲基丙烯酸甲酯
ST：苯乙烯
AA：丙烯酸
HPA：丙烯酸2-羥基丙酯
HEA：丙烯酸2-羥基乙酯
HBA：丙烯酸4-羥基丁酯
UM：N-(2-甲基丙烯醯氧基乙基)乙烯尿素(與2-(2-側氧基咪 唑啶-1-基)乙基2-甲基丙-2-烯酸酯相同)
範例10至12
範例10係重覆範例8。於範例11之組成物，購自Honeywell之Cohesa 0001聚烯烴分散液係以表3中所指示之量添加。於範例12，購自Lawter之Snowtack FH95G松香增稠劑分散液係以表3中指示之量添加。於不銹鋼(SS)及高密度聚乙烯(HDPE)基材上之Pl 15剝離強度結果(磅/英吋)係於表3中報導。

Claims (9)

  1. 一種壓敏性黏合劑組成物，其包含一單體混合物之乳化聚合反應產物，該單體混合物包含：(a)等於或大於約50重量%之一或多種丙烯酸酯或(甲基)丙烯酸酯；(b)約0.1至約5重量%之一或多種羥基官能性(甲基)丙烯酸系單體；(c)約0.05至約3重量%之一或多種以脲基取代之(甲基)丙烯酸酯單體；(d)選擇性之0至約10重量%之一或多種烴單體；及(e)選擇性之0至約6重量%之一或多種乙烯不飽和羧酸；其中，重量%係以該單體混合物之總重量為基準。
  2. 如請求項1之壓敏性黏合劑組成物，其中：(a)該一或多種丙烯酸酯或甲基丙烯酸酯包含C1-C17之丙烯酸烷酯或甲基丙烯酸烷酯；(b)該一或多種羥基官能性(甲基)丙烯酸系單體包含C1-C17之羥基官能性丙烯酸烷酯或甲基丙烯酸烷酯，或包含自C2-C12羧酸之縮水甘油酯製備之一或多種更多丙烯酸酯；及(c)該一或多種以脲基取代之(甲基)丙烯酸酯單體包含C7-C17之脲基丙烯酸烷酯或甲基丙烯酸烷酯。
  3. 如先前請求項1-2中任一項之壓敏性黏合劑組成物，其 中：(b)該一或多種羥基官能性(甲基)丙烯酸系單體係選自由丙烯酸羥基乙酯、甲基丙烯酸羥基乙酯、丙烯酸羥基丙酯、甲基丙烯酸羥基丙酯、丙烯酸羥基丁酯、(甲基)丙烯酸羥基丁酯、丙烯酸羥基己酯、甲基丙烯酸羥基己酯、丙烯酸羥基乙基己酯(hydroxyethylhcxyl acrylate)、甲基丙烯酸羥基乙基己酯(hydroxyethylhexyl methacrylate)，及其等之組合所組成之組群。
  4. 如請求項1或2之壓敏性黏合劑組成物，其中：(c)該一或多種以脲基取代之(甲基)丙烯酸酯單體係選自由下列所組成之組群：2-(2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；2-(1-甲基-2-側氧基咪唑啶-1-鎓-1-基)乙基2-甲基丙-2-烯酸酯；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[2-(2-側氧基咪唑啶-1-基)乙基]銨；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[2-(2-側氧基咪唑啶-1-基)乙基]氯化銨；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[1-(2-側氧基咪唑啶-1-基)乙基]銨；二甲基-[2-(2-甲基丙-2-烯醯氧基)乙基]-[1-(2-側氧基咪唑啶-1-基)乙基]氯化銨；2-(4-甲基-2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯； 1-(2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；2-(2-側氧基咪唑啶-1-基)乙基2-亞甲基丁酸酯；[1-乙醯胺基-2-(2-側氧基咪唑啶-1-基)乙基]2-甲基丙-2-烯酸酯；[2-側氧基-2-[2-(2-側氧基咪唑啶-1-基)乙基胺基]乙基]2-甲基丙-2-烯酸酯；2-(3-甲基-2-側氧基咪唑啶-1-基)乙基2-甲基丙-2-烯酸酯；[2-側氧基-2-[2-(2-側氧基咪唑啶-1-基)乙氧基]乙基]2-甲基丙-2-烯酸酯；[2-側氧基-2-[1-(2-側氧基咪唑啶-1-基)乙基胺基]乙基]2-甲基丙-2-烯酸酯，及其等之組合。
  5. 如請求項1或2之壓敏性黏合劑組成物，其中，以該單體混合物之總重量為基準，(d)該選擇性之一或多種烴單體係以0至約3重量%或約5至約10重量%之量存在，且係選自由苯乙烯化合物．乙烯、丙烯、丁烯、共軛二烯類，及其等之組合所組成之組群。
  6. 如請求項1或2之壓敏性黏合劑組成物，其中，以該單體混合物之總重量為基準，(e)該選擇注性之一或多種乙烯不飽和羧酸係以約0.5至約3重量%之量存在，且係一單乙烯不飽和單羧酸或及其酐。
  7. 如請求項1或2之壓敏性黏合劑組成物，其中，(e)無乙烯不飽和羧酸存在於該單體混合物中。
  8. 如請求項1或2之壓敏性黏合劑組成物，其中，以該單體混合物之總重量為基準，該一或多種以脲基取代之(甲基)丙烯酸酯單體(c)係以0.05至0.9重量%之量存在。
  9. 如請求項1或2之壓敏性黏合劑組成物，其進一步包含增稠劑或聚烯烴乳膠或其等之組合。
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