TWI842784B - 層壓膜及用於其之黏著劑 - Google Patents
層壓膜及用於其之黏著劑 Download PDFInfo
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- TWI842784B TWI842784B TW108142767A TW108142767A TWI842784B TW I842784 B TWI842784 B TW I842784B TW 108142767 A TW108142767 A TW 108142767A TW 108142767 A TW108142767 A TW 108142767A TW I842784 B TWI842784 B TW I842784B
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Abstract
一種膜結構,其包含:(a)至少一個官能化膜層,其中所述至少一個膜層包括用作所述膜結構中之內部層的極性反應性基團聚烯烴層;及(b)存在於所述內部層之表面的至少一部分上且與之接觸的層壓黏著劑組合物;其中所述黏著劑組合物之生黏性值大於0.772牛頓/公分;一種層壓物,其包含黏合至基板層的上文膜結構;一種用於生產所述膜結構之方法;一種用於生產所述層壓物之方法;及一種由上文層壓物製成的層壓製品。
Description
本發明係關於層壓膜及用於層壓方法以生產層壓膜之黏著劑組合物。
軟包裝工業一直在探索提高用於工業之層壓製程之產率的方式,以便以最快可能方式進入市場。層壓工業經常使用溶劑基產品試圖為一些最具挑戰性之結構提供快速層壓製程,諸如通常用於化學侵蝕性產品之聚對苯二甲酸伸乙酯(PET)/聚乙烯(PE)及PET/鋁(Al)/PE結構。然而,用於軟包裝工業之層壓製程中的限制性因素之一為用於層壓製程之層壓黏著劑提供之固化時間。固化時間限制在生產層壓物之製造製程中的層壓步驟之後轉化器可處理膜卷或幅材之速度。層壓黏著劑之固化時間影響黏著劑之黏合強度提高多快才能達到黏著劑之最大最終黏合強度值。通常,轉化器可生產用於層壓製程之膜或自膜製造商購買膜。隨後轉化器可列印膜且將膜層壓至基板上以製成最終層壓物,所述最終層壓物可供應給品牌所有者,品牌所有者可在包裝生產線中使用層壓物以製作包裝物品,諸如用於包裝各種產品之小袋。
一些迄今為止用作層壓黏著劑之已知黏著劑諸如「高效能層壓黏著劑系統」,亦即具有高固體含量及低分子量之聚合性組合物之黏著劑系統亦可具有低「生黏性」(例如小於(<)0.772牛頓/公分[N/cm]或200克力/吋[g-f/in]之生黏性),其在黏著劑系統中為非所需特徵。上文具有低生黏性之高含固量、低分子量黏著劑可容易地處理且塗覆於膜基板;然而,黏著劑可產生不同的處理問題。舉例而言,使用上文黏著劑之層壓膜可「套疊」(亦即膜之層可彼此滑開)。具有低生黏性之黏著劑亦可造成整個包裝製造製程之延遲,因為製程之下一包裝生產步驟必須等待層壓膜充分黏合以具有充分完整性而傳遞至下一生產步驟上。
本發明可藉由提供 可層壓至基板以形成層壓產物之官能化膜與具有高生黏性特性(例如大於[>] 0.772 N/cm或200 g-f/in)之層壓黏著劑的組合結構來解決先前技術之加工問題,所述層壓產物可立即用於製造製程以製造包裝製品。相應地,本發明提供(a)適當單層或多層膜結構及(b)具有高生黏性值之不同官能化聚合物的適當聚合層壓黏著劑組合物之新穎組合。在層壓製程中使用上文組分(a)與(b)之組合可最小化或消除諸如先前技術之層壓製程中所遇到的套疊之問題。有利地,在層壓製程中使用上文(a)膜結構與(b)層壓黏著劑組合物之組合能夠使得轉化器在層壓步驟之後進行快得多的後續轉化步驟以將膜結構轉化成層壓物用於生產包裝膜。反過來,此提高整個包裝膜製造製程之產率。
根據本發明,一個實施例係關於膜與黏著劑之 組合結構,其包含:(a)至少一個官能化膜層,其包括用作膜結構中之內部層的極性反應性基團聚烯烴層;及(b)存在於內部層之表面之至少一部分上並與之接觸的層壓黏著劑組合物;其中黏著劑組合物之生黏性值為> 0.772 N/cm(200 g-f/in)。
在另一實施例中,本發明係關於一種用於生產上文膜/黏著劑結構之方法。
在又一實施例中,本發明係關於一種層壓物,其包含:(a)至少一個官能化膜層,其包括在膜結構中用作內部層之極性反應性基團聚烯烴層;(b)存在於內部層之表面之至少一部分上且與之接觸的層壓黏著劑組合物;其中黏著劑組合物之生黏性值為> 0.772 N/cm(200 g-f/in);及(c)至少一個極性或非極性基板;其中基板之表面的至少一部分與黏著劑組合物接觸。
在又一實施例中,本發明係關於一種用於生產上文層壓物之方法。
在甚至又一實施例中,本發明係關於一種使用具有強黏合及> 0.772 N/cm(200 g-f/in)之高生黏值的黏著劑製成之包裝製品。
「高效能層壓黏著劑」在本文中係指雙組分聚胺基甲酸酯黏著劑,一旦所述黏著劑完全固化且恰當地塗覆於兩個基板膜之間,所述黏著劑產生優良黏合強度以避免使基板膜分離之可能性。而且,黏著劑能夠抵抗高熱應力,諸如熱封(例如在180℃與220℃之間)及/或滅菌;及/或能夠抵抗不同侵蝕性化學材料(例如酸、辛辣、界面活性劑、香精、醇、過氧化物)之侵蝕。相比而言,若在兩個膜之間的黏著劑經受與上文所提及之高效能層壓黏著劑相同的條件,「中等效能黏著劑」、「一般效能黏著劑」或、「通用黏著劑」將失去兩個基板膜結構中之黏著性。
關於黏著劑組合物,「生黏性」或「生黏合」在本文意謂剛好在含有黏著劑之結構(例如膜/黏著劑/膜結構)通過層壓機器之NIP部分(NIP為兩個圓柱體之間的小接觸:一個圓柱體由鋼製成且另一圓柱體由橡膠製成)之後由黏著劑產生的初始黏合強度值。一般而言,黏著劑之較高分子量導致較高黏度,其反過來導致較高生黏合。
關於黏著劑組合物,「黏合強度」在本文意謂對抗膜層壓結構之分層的力。黏合強度可與黏著劑組合物相關。舉例而言,在雙組分黏著劑中,黏著劑組合物之正確化學計量的選擇可能至關重要。舉例而言,富含聚酯之黏著劑將更牢固地黏附至極性膜,諸如鋁箔、金屬化膜、聚對苯二甲酸伸乙酯、聚醯胺及類似者。並且,舉例而言,富含聚醚多醇之黏著劑將更牢固地黏附至非極性基板,諸如聚乙烯、聚丙烯及類似者。
關於黏著劑組合物,「主要為異氰酸酯基」或「主要為羥基」在本文意謂存在於黏著劑系統中之活性或官能基。舉例而言,異氰酸酯基為存在於雙組分聚胺基甲酸酯黏著劑之部分A中的官能基/反應性基團;及雙組分聚胺基甲酸酯黏著劑之部分B主要含有將與(部分A之)異氰酸酯基反應以形成黏著劑的羥基。在將部分A與部分B摻合在一起之後化學反應開始。
關於聚合物樹脂,「官能化」在本文意謂當將功能性(極性)基團化學結合至另一提供「另外的化學極性官能基」之極性或非極性聚合物鏈(例如聚乙烯或乙烯共聚物)中時。
本發明之一個廣義實施例包含一種膜結構,其具有:(a)至少一個官能化膜層,其包括用作膜結構中之內部層的極性反應性基團聚烯烴層;及(b)存在於內部層之表面之最少一部分上且與之接觸的層壓黏著劑組合物;其中黏著劑組合物之生黏性值為> 0.772 N/cm(200 g-f/in)。
生產的與層壓黏著劑組合物組合之膜結構可包含單層或多層膜結構。多層層壓膜結構不限於任何特定層數;相應地在一個較佳實施例中,膜結構之層之數目可包含例如使用共擠壓製程製得的1層至13層。舉例而言,膜結構可在膜結構之任何層中包含一或多層之低密度聚乙烯(LDPE)、線性低密度聚乙烯(LLDPE)或LDPE/LLDPE之摻合物,其限制條件為膜結構之內部層為含有極性組分之層。
與膜結構組分(a)組合使用之層壓黏著劑組合物組分(b)可包含以下之摻合物:(α)至少一種異氰酸酯組分;及(β)至少一種多元醇組分。本發明之層壓黏著劑調配物或組合物之異氰酸酯組分(α)包含至少一種異氰酸酯化合物;且異氰酸酯為存在於黏著劑組合物中的主要化合物,亦即異氰酸酯組分(α)之濃度大於多元醇組分(β)之濃度。
舉例而言,與組分(β)中之羥基(OH)之含量相比適用與本發明中之黏著劑在組分(α)中含有顯著含量之異氰酸酯基。因此,根據本發明,用於本發明之調配物的異氰酸酯化合物組分(α)之濃度按調配物中所有組分之總重量計在一個實施例中一般可為例如0.5 wt%至10 wt%,在另一實施例中為1 wt%至5 wt%;且在又一實施例中為2 wt%至3 wt%。
含有顯著異氰酸酯含量且適用於本發明之黏著劑之實例包含高效能雙組分黏著劑,諸如Adcote L 76-205/L87-124;且將上文黏著劑與其他視情況選用之黏著劑混合。此等黏著劑有利地迅速產生生黏合。
本發明之黏著劑調配物具有有利性質及益處。舉例而言,在一個實施例中,與不含有為黏著劑組合物中之主要組分的異氰酸酯組分之其他黏著劑調配物相比本發明之黏著劑具有生黏性的提高。
一般而言,本發明之黏著劑組合物包含具有高生黏黏著性值之層壓黏著劑組合物,例如在一個具體實例中為> 0.772 N/cm(200 g-f/in);在另一實施例中為> 1,158 N/cm(300 g-f/in);及在又一實施例中為> 1.544 N/cm(400 g-f/in)。在其他實施例中,黏著劑組合物生黏黏著性值可在例如> 0.772 N/cm(200 g-f/in)至1.93 N/cm(500 g-f/in)範圍內。
層壓膜層與本發明之黏著劑組合物接觸的創新設計之一個益處為基於層壓製程之後層壓層與黏著劑層之間的化學相互作用,黏著劑組合物具有(1)迅速發生生黏性且(2)更快的黏合強度發生。舉例而言,當主要使用異氰酸酯產物形成黏著劑組合物時,就黏著劑之生黏合(亦即生黏性值)而言,出乎意料地主要含有異氰酸酯產物之黏著劑比不含官能化樹脂之黏著劑產物增加得更快。舉例而言,具有較高官能化含量之黏著劑組合物(例如,如本文下文本發明實例1及本發明實例4 [Amplify g-MAh + MAh]中所述),黏著劑組合物可具有較高生黏合。
本發明之另一益處為設計一種在層壓層中具有OH官能基之層壓膜促進更佳瞬時黏著性,且消除滯後時間,所述滯後時間通常需要數小時或數天以允許在黏著劑固化之後黏著性累積。藉由提供更佳瞬時黏著性及消除滯後時間,可實現顯著減少整個轉化製程時間。當前,在塗覆層壓黏著劑之後,在層壓機可進行後續轉化步驟(例如裁切步驟或第二層壓步驟)之前層壓機必須等待12小時與24小時之間。特定而言,12小時與24小時之間的長等待時間可能係由用於層壓製程在低至中等分子量(MW)黏著劑之低生黏性所致。
一般而言,用於生產本發明之膜結構的方法包含以下步驟:
(i)提供(a)至少一個官能化膜層,其包括用作膜結構中之內部層的極性反應性基團聚烯烴層;
(ii)提供(b)具有> 0.772 N/cm(200 g-f/in)之生黏性值的層壓黏著劑組合物;及
(iii)將層壓黏著劑組合物塗覆於所述內部層之表面之至少一部分以形成內部層與層壓黏著劑組合物膜結構之組合。
製備膜結構之方法可包含本領域中熟習此項技術者已知之任何層製備設備及方法,諸如共擠壓方法及設備。
一般而言,層壓物可包含:(a)至少一個膜層,其包括用作膜結構中之內部層的極性反應性基團(官能化)聚烯烴層;(b)存在於內部層之表面之至少一部分上並與之接觸的層壓黏著劑組合物;其中黏著劑組合物之生黏性值為>0.772 N/cm(200 g-f/in);及(c)至少一個極性或非極性基板;其中基板之表面之至少一部分與黏著劑組合物接觸。
參看圖1,展示形成層壓物之複數個層,一般由數字10指示。如前述,一般指示為數字20之膜結構可為單層,例如可用作內部層及外部層兩者之層21。在圖1中所示之實施例中,膜結構20包含黏著於單獨且不同的外部層22之內部層21。儘管圖1中未展示,但本發明之另一實施例可包含包夾在內部層21與外部層22之間的任何多個層。如圖1中所展示,將黏著劑層31塗覆至內表面21;及使基板41與黏著劑層31接觸以經由黏著劑31及內部層21將基板黏附至膜結構20。可將層20、31及41壓製在一起以形成多層層壓物10。
本發明之組合膜/黏著劑結構已在上文描述。一旦將黏著劑塗覆至膜層,可使基板、組分(c)經由黏著劑側面與膜/黏著劑結構接觸。
適用本發明中用以生產層壓物之基板可為例如至少一個極性或非極性基板。適用於接觸上文所描述之膜/黏著劑組合之示例性極性基板可包含聚對苯二甲酸伸乙酯(PET)、雙取向聚醯胺(BOPA)、金屬化聚對苯二甲酸伸乙酯(metPET)、金屬化BOPP及鋁箔。適用於接觸上文膜/黏著劑組合之示例性非極性基板可為聚丙烯(PP)、聚乙烯(PE)及BOPP及流延聚丙烯(cPP)膜。
用於生產上文所描述之層壓物的方法可包含以下步驟:
(I)提供(a)至少一個官能化膜層,其包括用作膜結構中之內部層的極性反應性基團聚烯烴層;
(II)提供(b)具有>0.772 N/cm(200 g-f/in)之生黏性值的層壓黏著劑組合物;
(III)提供至少一個極性或非極性基板;
(IV)將層壓黏著劑組合物塗覆於內部層之表面之至少一部分以形成內部層與層壓黏著劑組合物膜結構之組合;及
(V)使至少一個極性或非極性基板與存在於內部層上之黏著劑組合物接觸;其中基板之表面的至少一部分與黏著劑組合物接觸以實現黏著於內部層之基板之間的強黏合以形成層壓物。
製備層壓物之方法可包含本領域中熟習此項技術者已知之任何層壓物製備設備及方法,諸如乾式層壓,其中將黏合劑溶解於溶劑中;隨後將含黏合劑之溶劑塗覆至待層壓之幅材中之一者;及隨後自使含黏合劑之溶劑塗覆於幅材之表面上的幅材蒸發溶劑。蒸發可在乾燥烘箱中進行以提供第一乾燥幅材。隨後在強壓力下藉由加熱輥塗覆將第一乾燥幅材層壓至另一第二幅材以在兩個幅材之間提供永久性黏合。
根據本發明生產之層壓物有利地具有若干有利性質及益處。舉例而言,在一個實施例中,層壓物可立即用於製備物品(諸如包裝物品)而不必等待較長黏著劑固化時間,因為黏著劑對膜組合顯現高生黏性。
在另一實施例中,本發明係關於使用上文所描述之層壓物製得的包裝物品,所述層壓物已使用具有強黏合及> 0.772 N/cm(200 g-f/in)之生黏性值的黏著劑製造。示例性包裝物品可包含枕袋式小袋、直立小袋、袋、藥囊、其他層壓幅材及類似者。
製備包裝物品之方法可包含本領域中熟習此項技術者已知之任何包裝製備設備及方法,諸如垂直成形/填充/密封(VFSS)、水平成形/填充/密封(HFFS)、預製直立小袋(SUP)及成形/填充/密封直立小袋(FFS SUP)機器。
根據本發明製得的膜結構及層壓物可適用於各種應用中,包含例如用2、3或更多層生產之食品或非食品層壓包裝,諸如聚酯/箔/PE;紙/聚/箔;BOPP/箔/PE;或BOPP/金屬化PP/PE、BOPP或cPP;或藉由使用三重或串聯層壓機方法執行之層壓,所述三重或串聯層壓機方法可層壓3種基板,如PET/箔/PE、BOPP/箔/PE、PET/BOPP/PE或類似直列式基板。
實例
以下實例係為了進一步詳細說明本發明而呈現,而不應視為限制申請專利範圍之範疇。除非另外陳述,否則所有份數及百分比均以重量計。
實例中所使用之各種原材料描述於如下表I中:
表I -原材料
表I之註釋:*「方法A」為用於製備Amplify EA 101-g-MAH之方法,且在本文下文描述。「EA」代表「丙烯酸乙酯」;「MAH」代表「順丁烯二酸酐」;「g-MAH」代表「經順丁烯二酸酐接枝」;「EVA」代表「乙烯乙酸乙烯酯」;「LLDPE」代表「線性低密度聚乙烯」;及PE代表「聚乙烯」。
實例1至4及比較實例A
組分 | 簡要描述 | 供應商 |
Elite 5400G | 茂金屬LLDPE共聚物 | 陶氏化學公司(Dow) |
Amplify EA 101-g-MAH | 經順丁烯二酸酐接枝之乙烯丙烯酸乙酯共聚物 | 方法A* |
EVA ELVAX | 乙烯乙酸乙烯酯 | 陶氏-杜邦(Dow-DuPont) |
Amplify TY 1057 | MAH接枝之聚乙烯 | 陶氏 |
ADCOTE 805A / C | 與下文描述之ADCOTE L76-205/87-124相同 | 陶氏 |
ADCOTE 331 | 單組分通用層壓黏著劑 | 陶氏 |
ADCOTE L-76-205/CR87-124 | 高含固量溶劑源性層壓黏著劑,亦稱為ADCOTE™ 805A/C | 陶氏 |
標準高潤滑性PE |
在以下本發明實例(Inv. Ex.)及比較實例(Comp. Ex.)中,用於層壓(及黏合)PET層至若干官能化基板之溶劑基黏著劑基於以下之基板:(1)乙烯乙酸乙酯(EEA)、(2)乙烯乙酸乙烯酯(EVA)及(3)順丁烯二酸酐(MAH)基團。評估基板對黏著劑之生黏性(在層壓10分鐘之後的黏合強度)的作用。
使用五層共擠壓生產線擠壓表II中所描述之五種具有樹脂調配物的不同膜。使用實驗室層壓機器(Labo Combi機器)將膜層壓至聚對苯二甲酸伸乙酯(PET)基板(12微米厚)且在塗覆3 g黏著劑至膜之經電暈處理表面之前使膜的側表面中之一者經電暈處理。隨後,將3 g高含固量、高效能雙組分黏著劑ADCOTE ™ L76-205/87-124塗覆至膜之經電暈處理表面。將高含固量黏著劑用於實例以理解官能化膜對與生黏性相關之黏著效能的作用。實例中所用之黏著劑ADCOTE ™ L76-205/87-124之混合比及化學組成描述於表III中。
表II - 層壓樹脂的配方
表III -溶劑基、高含固量、高效能雙組分黏著劑
*ppr =份/一百份樹脂
方法A -製備AMPLIFY™ EA 101-g-MAH之方法
實例 | 調配物 |
比較實例A | 100% Elite 5400(參考樹脂) |
本發明實例1 | 100% AMPLIFY™ EA 101-g-MAH |
本發明實例2 | 35 % EVA ELVAX + 65 % AMPLIFY™ TY 1057 |
本發明實例3 | 35 % AMPLIFY™ EA 101-g-MAH % + 65 % AMPLIFY™ TY 1057 |
本發明實例4 | 35 % Elite 5400 + 65 % AMPLIFY™ TY 1057 |
黏著劑 | 異氰酸酯 組分 NCO | 多元醇 組分 OH |
Adcote L 76-205/Adcote 87-124 | Adcote L 76-205 | Adcote 87-124 |
混合比,ppr * | 100 | 17 |
Amplify EA為丙烯酸乙烯乙酯(EEA)共聚物。此共聚物可經約1%順丁烯二酸酐(MAH)基團接枝以增強共聚物之官能性。諸如EEA、EVA或EMA共聚物之共聚物具有極性且傾向於與黏著劑層形成極性-極性(非反應性)相互作用。然而,經MAH接枝之共聚物的MAH-g-基團部分將傾向於與黏著劑中之任何過量多元醇形成共價鍵。
AMPLIFY™ EA 101-g-MAH之生產描述係描述於表IV中;且製備AMPLIFY™ EA 101-g-MAH之製程可藉由用順丁烯二酸酐(MAH)基團將聚合物接枝使用反應性擠壓製程來進行。將具有中等強度螺桿之92 mm共轉雙螺桿擠壓機用於反應性擠壓。調配物由基質聚合物(例如AMPLIFY™ EA 101,順丁烯二酸酐(MAH),99%)及2,5-二甲基-2,5-二(第三丁基過氧基)己烷(DBPH,過氧化物(POX))組成。POX用礦物油稀釋(例如以1:1比率)以提高處置及饋入進料材料之容易性。MAH進料水平在1.4 wt%至1.5 wt%之間且過氧化物進料水平在330 ppm至650 ppm。壓出機在862 kg/hr至953 kg/hr之速率下操作,螺桿速度在475 rpm至630 rpm之間。用於接枝之擠壓機的溫度分佈曲線(以℃為單位)展示於表V中。
表IV -產物說明
表III之註釋:( 1 )
經順丁烯二酸酐接枝之AMPLIFY™ EA 101。( 2 )
在2.16 kg及190℃下。( 3 )
按總產物重量計。
表V -擠壓機之溫度分佈曲線
表IV之註釋:( 1 )
「S/C」代表換網器;及( 2 )
「PDV」代表聚合物分流閥。
生黏黏合強度-量測方法
產物 | 產物之簡單說明 | 密度 (g/cm3 ) | 熔融指數(℃/min( 2 ) ) | 順丁烯二酸酐 (wt% ( 3 ) ) | 丙烯酸酯(wt%) |
AMPLIFY™ EA 101 | 乙烯丙烯酸乙酯共聚物 | 0.931 | 6 | 0 | 18.5 |
AMPLIFY™ EA 101-g-MAH ( 1 ) | 順丁烯二酸酐濃縮物 | 0.931 | 3.23 | > 0.5 wt%及 >2.5 wt% | 18.5 |
區域2 | 區域3 | 區域4 | 區域5 | 區域6 | 區域7 | 區域8 | 區域9 | 區域10 | 區域11 | S/C(1) | PDV(2) | DIE |
177 | 191 | 191 | 191 | 191 | 191 | 177 | 121 | 121 | 121 | 177 | 177 | 177 |
黏著劑之生黏黏合特性可藉由使用Instron Tensile機器根據ASTM F904-98中所描述之程序來量測。根據所述程序,藉由機器鉗口固持層壓結構之兩側且隨後沿單軸方向拉伸層壓結構。藉由採取每個樣品之兩次樣品量測值獲得資料;且隨後使用報告平均值及圖形的電腦來分析資料。在層壓結構已經歷層壓之後10分鐘量測生黏特性。
在圖2之圖表中,展示當使用高含固量黏著劑ADCOTE™ L 76-205/87-124與不同的PE調配物時之生黏性值。當將所有官能化膜層基板(本發明實例1、本發明實例2、本發明實例3及本發明實例4)與比較實例A(樹脂參考物:100% ELITE™ 5400無添加劑且厚度為50微米)相比時,發現生黏合值自16%至86%之極大提高。當層壓之後剛好10分鐘量測時,用黏著劑、經1% g-MAH接枝之100% AMPLIFY EA 101生產的本發明實例1之膜層基板具有364克力/吋之最高生黏性值。高含固量高效能雙組分黏著劑展示86%之生黏性值。本發明實例1之層壓物的此出人意料之性能將使得本領域中熟習此項技術者能夠使用迄今為止不可能的(1)串聯(三重)層壓或(2)聯機層壓及切割。本發明實例4之樣品亦展示生黏合值提高44%。總而言之,如圖2中所展示,上文生黏性測試之結果證實共聚物Amplify EA(1 %之MAH)及「共聚物EA + Amplify 1057」之摻合物(在摻合物中1%之MAH)與比較實例A相比時向層壓物提供更佳生黏合。
10:層壓物
20:膜結構
21:內部層
22:外部層
31:黏著劑層
41:基板
圖1為展示本發明之多層膜結構之示意圖。
圖2為展示具有各種不同聚乙烯調配物之高效能層壓黏著劑ADCOTE™ L 76-205/87-124之生黏性值的圖解條形圖。
10:層壓物
20:膜結構
21:內部層
22:外部層
31:黏著劑層
41:基板
Claims (14)
- 一種膜結構,其包括:(a)至少一個官能化膜層,其中所述至少一個官能化膜層包括用作所述膜結構中之內部層壓層的極性反應性基團聚烯烴層;及(b)存在於所述內部層壓層之表面的至少一部分上且與之接觸的層壓黏著劑組合物;其中所述黏著劑組合物之生黏性值大於0.772牛頓/公分。
- 如請求項1所述之膜結構,其中所述至少一個官能化膜層為單層。
- 如請求項1所述之膜結構,其中所述至少一個官能化膜層包括兩層或更多層之多層,其中所述兩層或更多層中之至少一者為極性反應性基團聚烯烴層之內部層,且所述兩層或更多層中之至少一者為外部層。
- 如請求項1所述之膜結構,其中所述極性反應性基團聚烯烴層選自由以下組成之群:經接枝之乙烯極性共聚物;非極性聚乙烯與經接枝之乙烯極性共聚物的物理摻合物;乙烯乙酸乙烯酯極性共聚物與經接枝之乙烯極性共聚物的物理摻合物;及經接枝之丙烯酸乙烯乙酯極性共聚物與經接枝之乙烯極性共聚物的物理摻合物。
- 如請求項1所述之膜結構,其中所述層壓黏著劑組合物為主要具有異氰酸酯基之雙組分層壓黏著劑組合物。
- 一種用於生產膜結構之方法,其包括以下步驟:(i)提供(a)至少一個膜層,其中所述至少一個膜層為用作所述膜結構中之內部層的極性反應性基團聚烯烴層;(ii)提供(b)具有大於0.772牛頓/公分之生黏性值的層壓黏著劑組合物;及 (iii)將所述層壓黏著劑組合物塗覆於所述內部層之表面的至少一部分以形成所述內部層與所述層壓黏著劑組合物之組合膜結構。
- 一種層壓物,其包括:(a)至少一個官能化膜層,其中至少一個膜層為用作所述層壓物中之內部層的極性反應性基團聚烯烴層;(b)存在於所述內部層之表面的至少一部分上且與之接觸的層壓黏著劑組合物;其中所述層壓黏著劑組合物之生黏性值大於0.772牛頓/公分;及(c)至少一個極性或非極性基板;其中使所述基板之表面的至少一部分與所述黏著劑組合物接觸;其中藉由安置於所述至少一個官能化膜層與所述至少一個極性或非極性基板之間的所述層壓黏著劑組合物形成包括黏合至所述至少一個極性或非極性基板之所述至少一個官能化膜層的層壓物。
- 如請求項7所述之層壓物,其中所述極性基板選自由以下組成之群:聚對苯二甲酸伸乙酯、雙取向聚醯胺、金屬化聚對苯二甲酸伸乙酯、金屬化雙取向聚醯胺及鋁箔。
- 如請求項7所述之層壓物,其中所述非極性基板選自由以下組成之群:聚丙烯、聚乙烯及流延聚丙烯。
- 一種層壓製品,其包括由如請求項7所述之層壓物製成的小袋、藥囊、或其他袋部件。
- 一種用於生產包含至少第一層及至少第二層之層壓物的方法,其包括以下步驟:(I)提供形成至少第一膜層之至少一個官能化膜層,其中所述至少一個官能化膜層為用作層壓物中之內部層的極性反應性基團聚烯烴層;(II)提供形成至少第二膜層之至少一個極性或非極性膜基板; (III)提供具有大於0.772牛頓/公分之生黏性值的層壓黏著劑組合物;(IV)將所述層壓黏著劑組合物塗覆於所述至少第一膜層之表面的至少一部分以形成內部膜層與層壓黏著劑組合物之組合;及(V)使所述至少一個極性或非極性膜基板與存在於所述內部膜層之所述表面的至少一部分上之所述黏著劑組合物接觸,以使得所述黏著劑組合物安置於第一與第二膜層之間;且其中所述膜基板之表面的至少一部分與所述黏著劑組合物接觸以實現所述內部膜層與所述膜基板之間的黏合以形成層壓物。
- 如請求項11所述之方法,其中當所述層壓物經受分層測試時,黏合強度對於所述層壓物承受至少200gf/in之量測黏著力而言係足夠的,所述分層測試試圖使所述第一膜層與所述第二膜層分層,其中安置於所述層之間的所述黏著劑組合物對抗分層。
- 如請求項11所述之方法,其中所述至少第二膜基板層選自由以下組成之群:聚對苯二甲酸伸乙酯、雙取向聚醯胺、金屬化聚對苯二甲酸伸乙酯、金屬化雙取向聚丙烯、鋁箔、聚丙烯、聚乙烯、雙取向聚丙烯及流延聚丙烯。
- 一種層壓製品,其包括由如請求項11所述之方法製成的小袋、藥囊、或其他袋部件。
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