TWI623431B - 具有黏著分離層之物件 - Google Patents
具有黏著分離層之物件 Download PDFInfo
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- TWI623431B TWI623431B TW102148837A TW102148837A TWI623431B TW I623431 B TWI623431 B TW I623431B TW 102148837 A TW102148837 A TW 102148837A TW 102148837 A TW102148837 A TW 102148837A TW I623431 B TWI623431 B TW I623431B
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- Taiwan
- Prior art keywords
- article
- adhesive
- separation layer
- microns
- substrate
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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Abstract
本發明提供一種物件,其包含:(1)薄片,其具有第一表面及第二表面;及(2)分離層,其位於該第一表面之至少一部分上,其中該分離層包含:(a)黏合層,其具有夾帶於其中之顆粒;及(b)外塗層。本發明亦提供用於製造此等物件之方法及使用此等物件之方法。
Description
本發明係關於上面具有黏著分離層,亦即,供背黏式物件使用之離型襯墊的物件,該等背黏式物件係以襯墊或捲筒形式等排列。
廣泛使用包含壓敏性黏著劑之物件,常見實例包括膠帶、標籤及黏著便箋等。
在許多情況下,將壓敏性黏著物件建構成具有離型襯墊,以便在儲存期間保護黏著劑,直至需要將其塗覆至各種基板為止。藉由標準廢紙回收製程無法有效地回收習知襯墊(通常為塗佈有聚矽氧之紙),且必須將該襯墊與現今之混合式廢紙回收廢物流分離。此外,載有重要類別之壓敏性黏著劑(稱為永久性黏著劑)的物件需要使用此等襯墊來實現應用中黏著劑之遞送。在無襯墊之情況下,永久性黏著劑將形成與其他物體之不良黏著以及與其自身之黏合(例如,捲筒阻塞)。在自永久性黏著劑移除襯墊以准許附著載有黏著劑之物件之後,棄置該襯墊。襯墊於黏著物件之此等使用為昂貴、浪費且不可持續的。
在以帶墊或捲筒形式排列物件之狀況下,用離型劑處理該物件之與存有黏著劑之側面對置的側面,從而准許分離(亦即,如在自墊移除薄片時)或展開(亦即,如在自捲筒退繞膠帶時)物件。此等離型劑可能需要成本之增加以及無法提供所要性質,例如,在維持所要可寫
特性之同時自永久性黏著劑之充分釋放。
需要對廣泛範圍之黏著劑有效的經改良之黏著分離層。
本發明提供上面具有黏著分離層之物件。
概括而言,本發明之物件包含:(1)基底,其具有第一表面;及(2)分離層,其位於該第一表面之至少一部分上。根據本發明,該分離層包含:黏合層,其具有部分地夾帶於其中且自其突出之顆粒;及離型劑。該離型劑可為該分離層之表面上的外塗層或可併入該黏合層中。在許多實施例中,該基底將為具有第一表面及第二表面之薄片,例如,一張紙。在一些實施例中,該物件將進一步包含在該薄片之該第二表面上的黏著劑,例如,壓敏性黏著劑。在許多此等實施例中,將物件配置於總成中,例如,將一或多個物件捲繞成捲筒形式或以帶墊配置進行堆疊,以使得在上覆物件或其部分上之黏著劑與下伏物件或其部分之分離層接觸。
另外,本發明提供一種用於製造此等物件之方法,概括而言,該方法包含提供具有第一表面之基底及在其上形成分離層。
另外,本發明提供一種用於使用本發明之物件的方法,概括而言,該方法包含:(1)提供該物件,其中該基底包含水分散性材料;及在使用此物件之後,(2)將該物件置放於水中;(3)使該物件在水中分散;及(4)回收該基底材料。
已意外地發現,本發明之分離層提供優越之黏著劑脫離性質及其他性質。舉例而言,自強黏性黏著劑(亦即,有時稱作「永久性」黏著劑)之清潔、容易的脫離係可能的。另外,該等分離層展現其他所要特性,包括可寫性、抗污性、可撓性及可回收性。如本文中所使用,術語「可回收」用以指具有充分水分散性以在習知廢紙回收操作中成功加以處理的物件,藉由該等操作,可回收纖維以重新用於造
紙。
結果,本發明之物件可適用於大量應用。本發明之物件的說明性實施例包括可再漿化離型襯墊、帶墊便箋、畫板墊(easel pad)、膠帶等。
10‧‧‧物件
12‧‧‧基底
14‧‧‧第一表面
16‧‧‧第二表面
18‧‧‧分離層
20‧‧‧顆粒
22‧‧‧黏合層
24‧‧‧離型劑外塗層
26‧‧‧表面
28‧‧‧黏著層
參看圖式進一步解釋本發明,其中:圖1為本發明之說明性實施例的一部分之橫截面圖;圖2為本發明之分離層的說明性實施例之一部分(以平面圖表示)的影像分析;及圖3為根據本發明之說明性實施例的紙基底薄片上之分離層的數位顯微照片橫截面。
圖1未按比例繪製且為理想化的;此等圖意欲僅為說明性而非限制性的。
對於以下所定義之術語,除非在申請專利範圍中或在本說明書中別處給出不同定義,否則應該應用此等定義。
術語「聚合物」將理解為包括聚合物、共聚物(例如,使用兩種或兩種以上不同單體形成之聚合物)、寡聚物及其組合,以及可藉由(例如)共擠壓或反應(包括酯基轉移)形成為可混溶摻合物之聚合物、寡聚物或共聚物。除非另外指示,否則包括嵌段共聚物及無規共聚物兩者。
除非另外指示,否則說明書及申請專利範圍中所使用的表示成份之量、性質(諸如,分子量)、反應條件等之所有數字將理解為在所有情況下由術語「約」修飾。因此,除非有相反指示,否則前述說明書及所附申請專利範圍中所陳述之數值參數為可取決於由熟習此項技
術者利用本發明之教示來設法獲得之所要性質而變化的近似值。最低限度,且不作為限制申請專利範圍之範疇的等效物之學說的應用的嘗試,應至少根據所報告之有效數位的數目及藉由普通捨入技術之應用來解釋每一數值參數。雖然陳述本發明之寬廣範疇之數值範圍及參數為近似值,但儘可能精確地報告特定實例中所陳述之數值。然而,任何數值固然含有由在各別測試量測結果中所發現之標準偏差而必然引起的某些誤差。
重量百分數、以重量計之百分數、重量%及其類似物為同義的,其將物質之濃度指代為該物質之重量除以組合物之重量且乘以100。
由端點對數值範圍之敍述包括含於該範圍內之所有數字(例如,1至5包括1、1.5、2、2.75、3、3.80、4及5)。除非內容另外明確地規定,否則如本說明書中及隨附申請專利範圍中所使用之單數形式「一」及「該」包括複數意義。因此,例如,對含有「化合物」之組合物的引用包括兩種或兩種以上化合物之混合物。除非內容另外明確地規定,否則如本說明書及隨附申請專利範圍中所使用之術語「或」一般係在其包括「及/或」之意義上加以使用。
如上文所論述,本發明之物件包含薄片及在其第一表面上之分離層。圖1為本發明之說明性實施例的一部分之橫截面圖,其中物件10(例如,膠帶)包含具有第一表面14及第二表面16之基底12。第一表面14之至少一部分覆蓋有分離層18,該分離層18包含部分地夾帶在黏合層22中且自該黏合層突出的顆粒20。另外,分離層18包含在其表面26上之離型劑外塗層24。另外,物件10進一步包含在基底12之第二表面上的視情況選用之黏著層28。
熟習此項技術者可易於選擇用於基底之合適材料,此選擇很大
程度地取決於預期應用。舉例而言,在許多實施例中,基底將為出於以下所要性質而選擇之薄片:例如色彩、抗張強度、抗撕裂性、可撓性、彈性、回彈性、尺寸及組態穩定性等。
合適材料之說明性實例包括各種紙、紙板及其類似物之薄片。儘管非常適合用於意欲為可回收(亦即,在水分散性操作中處理)之應用中,但亦可使用不以該方式回收之其他種類之基底材料(例如,塑膠薄片、金屬化薄膜等)來獲得黏著劑保護及釋放之優點。除上文所提及之材料外,用於本發明中之合適基板或薄片的說明性實例亦包括編織物或非編織物(包含合成或天然材料,通常較佳經壓光處理)、塑膠薄膜、乙酸纖維素、乙基纖維素、金屬、金屬化聚合薄膜、陶瓷薄片材料及其類似物。
基底之厚度對於本發明而言並不重要,且本質上將取決於所得物件之預期應用。在一些實施例中,基底為具有自約25微米至約155微米之厚度的薄片,但不排除更厚及更薄之材料。
取決於實施例,該薄片可具有單層或多層構造。在一些實施例中,基底可本質上由一張紙組成。
對於許多應用,較佳紙張為維持有適量水以實現水基塗層而無過量薄片變形的紙張。舉例而言,3MTM畫板墊係由具有抗滲膠塗層之低定量紙(例如,70g/m2)的複數張紙張製成。本發明可用於此等產品上以提供所要的薄片間黏著及良好的可寫性質。
本發明之分離層包含黏合層,其具有部分地夾帶在其中且自其突出之顆粒。另外,分離層包含可作為黏合層之組份併入或作為外塗層塗覆於黏合層及突出顆粒上的離型劑。
在本發明之物件中,黏合劑充當將顆粒固持至基底之第一表面
的媒劑。
黏合劑必須具有足夠強之黏性,以便在物件之製造及處置期間將顆粒固持在表面上適當位置。在基底可撓且易撓曲成不同組態(例如,捲繞成捲筒形式之膠帶或塗覆至彎曲表面之薄片)的實施例中,黏合劑應足夠可撓以在保持所夾帶顆粒之同時隨基底彎曲。影響此特性之一個重要性質為乾燥聚合物之玻璃轉移溫度(「Tg」)。適用於習知環境中之本發明之物件的聚合物乳膠較佳具有自約-30℃至約+30℃,更佳自約-20℃至約+10℃,且最佳自約-15℃至約0℃之Tg。若Tg過低,則所得黏合層可傾向於過硬且易裂開,從而無法達成基底之所要軟度或可撓性(取決於實施例)。若Tg過高,則所得黏合層可傾向於太過膠黏或黏著,從而使得用起來不太便利或合意(取決於實施例)。
適用於本發明之物件中的黏合劑之說明性實例包括造紙工業中通常已知之聚合物乳膠、乳液或分散液。通常,較佳黏合劑為由諸如以下各者之單體製成的水基丙烯酸聚合物:乙酸乙烯酯、苯乙烯、丁二烯、丙烯酸丁酯、丙烯酸及丙烯腈。在一些狀況下,亦可使用溶劑作為聚合物黏合劑溶液之部分。
聚合物乳膠之摻合物亦可適用於本發明。
適用聚合物乳膠黏合劑之說明性實例包括:修飾苯乙烯丙烯酸聚合物,諸如來自BASF之JONCRYLTM 74A,其由於其在進行紙再漿化之應用中的效能而常常為較佳的;丙烯酸聚合物,諸如來自Lubrizol之HYCARTM 26469及26083、HYSTRETCHTM V-29及CARBOSETTM AE960以及來自Dow Chemical Co.之RHOPLEXTM A-920及RHOPLEXTM NW-1725K;丙烯酸乳膠,諸如來自Reichhold之SYNTHEMULTM 40系列;乙酸乙烯酯-乙烯乳液,諸如來自Air Products之AIRFLEXTM 192及來自Celanese之DUROSETTM E-230;丙
烯酸分散液,諸如來自Alberdingk Boley,Inc之AC2523及M2064;苯乙烯-丁二烯官能聚合物,諸如來自OMNOVA Solutions,Inc.之GENCRYLTM;聚乙烯醇,諸如來自Sekisui Specialty Chemicals之SELVOLTM;及丙烯酸系物,諸如來自Eastern Color & Chemical Co.之ECCOTM Resin P-009。其他適用聚合物黏合劑可包括各種胺基甲酸酯分散液,諸如來自Alberdingk Boley,Inc.之U6150及U933。
為了改良本發明之基於紙之物件的可回收性,乾燥乳膠宜為水可分散的以便實現再漿化,從而達成可回收性。在此等狀況下,諸如羧基、羥基、環氧乙烷、四級胺等之親水性官能基可構成乳膠黏合劑之一部分。
在許多實施例中,一或多種額外佐劑可併入黏合劑中。說明性實例包括增稠劑、殺生物劑、界面活性劑、緩衝劑、著色劑及其類似物。
適用於本發明中之顆粒的說明性實例包括小型有機球形顆粒、小型無機球形顆粒或其組合。
顆粒通常具有多分散型粒徑分佈,換言之,具有(例如)自約5微米至約200微米之大小範圍。在此等情況下,給出顆粒之平均粒徑。具有若干微米之極小粒徑範圍的單分散性顆粒亦可為有用的。顆粒之平均大小對於本發明在釋放表面上產生微結構而言為重要的,該微結構足以最少化與黏著劑之接觸。然而,較大的平均粒徑將降低在表面上書寫之能力,且亦導致在移除黏著劑時衝擊程度更大(較差平滑觸感)之剝離。適用於本發明之平均粒徑為自約5微米至約60微米,較佳自約10微米至約50微米,且最佳自約20微米至約40微米。
有機顆粒通常由諸如以下各者之各種丙烯酸單體的懸浮聚合來形成:甲基丙烯酸酯、甲基丙烯酸甲酯、苯乙烯、丙烯酸丁酯、丙烯
酸乙基己酯(2-EHA)、丙烯酸異辛酯(IOA)、丙烯酸、己二醇二丙烯酸酯(HDDA)等。本發明之特別適用的顆粒(亦稱作非黏性微球體)揭示於美國專利第8,110,280號(Graham等人)中。較佳有機顆粒之一些其他說明性實例包括:交聯丙烯酸顆粒,例如來自Esprix Technologies之MR-30G;及交聯聚甲基丙烯酸甲酯顆粒,例如來自Sunjin Chemical Co.之SUNPMMA-S400。
適用的無機顆粒通常由以下各者形成:各種形式之矽石,諸如來自Potters Industries,LLC之玻璃球SPHERIGLASSTM 3000及中空玻璃球Q-CELTM 6048;矽石珠粒,諸如來自Sunjin Chemical Co.之SUNSILTM 150H;中空玻璃微球,諸如來自3M Company之S60;中空玻璃顆粒,諸如來自Silbrico Corporation之SIL-43;或陶瓷珠粒,諸如來自Zeeospheres Ceramics,LLC之G-600。
亦可有利地使顆粒上具有表面塗層,從而有助於與黏合劑之相互作用且改良與紙表面之固著。
本文中所使用之顆粒可具有任何所要形狀,包括例如球形、卵形及不規則形。本文中所使用之顆粒可為中空或實心的。
為形成分離層,將包含樹脂黏合劑及顆粒之塗層組合物塗覆至基底之第一表面的至少一部分且使其乾燥,從而留下所要的本發明之分離塗層。可藉由任何合適手段(例如刮刀式塗佈、簾幕式塗佈、滴落式塗佈等)來進行塗覆。通常,塗佈製程較佳為水性製程,但可以溶劑性方式進行,其限制條件為所得分離層為水可分散的。
選擇黏合劑及顆粒之量,以使得在乾燥後即形成由顆粒(單獨地或呈叢集形式)界定之紋理化表面。
該等顆粒係隨機地分散且藉由黏合劑黏合在薄片表面上。顆粒可個別地分散或與其他顆粒聚結(群聚),以形成具有兩個或兩個以上顆粒之較大群集。圖2為藉由共焦掃描雷射顯微鏡(50倍物鏡)進行的
PET薄膜基底上之本發明之代表性分離層的影像分析。圖3為根據本發明之紙基底薄片上的分離層之橫截面的數位顯微鏡成像:可使用共焦掃描雷射顯微術來表徵本發明之分離層,以如下文所述測定顆粒之以下空間特徵。
高度(h):描述峰值區之頂部的高度減去沿著峰值區之周邊之平均高度的量測結果(以微米為單位)。本發明之說明性實施例具有自約10微米至約50微米之平均H。
等效圓直徑(ECD):描述具有與峰值區相同之面積的圓之直徑的量測值(以微米為單位)。本發明之說明性實施例具有自約50微米至約100微米之平均ECD。
最近相鄰者距離(NND):描述一個峰值區之質心與其最近峰值區之質心之間的距離的量測值(以微米為單位)。本發明之說明性實施例具有自約50微米至約150微米之平均NND。
將峰值區界定為表面上由單一隔離顆粒或一群聚結顆粒所佔據的區。
可藉由分析由共焦掃描雷射顯微術所獲得之高度圖來將顆粒叢集特性化。定製程式識別峰值區且設定其大小。在已藉由帶通空間濾波器對高度圖進行濾波從而產生峰值區之二進位影像之後,該程式將該高度圖臨限值化。選擇截止頻率及臨限位準,以使得良好地識別峰值區。可針對每一峰值區量測H及ECD且將其分別平均化;以兩種不同方式來估計平均NND。藉由以下公式給出隨機地定位於無限之二維表面上的點之平均最近相鄰者距離:
其中d為最近相鄰者距離之平均值,且n為每單位面積之點數目。因為樣品中之相異峰值區並不小且不可重疊,所以此關係可能低
估此等樣品之最近相鄰者距離。對於以方格配置之點,平均最近相鄰者距離為:
若準確地量測n,則最近相鄰者距離之實際平均值可能位於此等兩個值之間。
在說明性實施例中,第一表面及分離層塗層具有自約10微米至約微米之平均H、自約50微米至約100微米之平均ECD,及自約50微米至約150微米之平均NND。
黏合劑與顆粒之比率對於具有足量黏合劑以將顆粒緊固在基底上為重要的。舉例而言,在許多實施例中,塗層組合物具有約4:1,較佳約3:1且最佳約1.5:1之黏合劑與顆粒重量比。
另外,塗層組合物(亦即,黏合劑加顆粒等)之量對於達成本發明之優點為重要的。本發明之分離層可為相對薄的。在許多實施例中,所得分離層具有自約5g/m2至約15g/m2,較佳自約7g/m2至約12g/m2且最佳自約8g/m2至約11g/m2之塗佈乾重。若使用過多塗層組合物,則顆粒將不會充分地分散,從而導致較拙劣之釋放性質,以及可能損害物件之潛在可回收性或再漿化性。若使用過少塗層組合物,則顆粒將不會充分牢固地黏合至物件且將傾向於容易彈出。
本發明之分離層亦包含離型劑。在一些實施例中,在將塗層組合物塗覆至基底之表面之前,將離型劑併入該塗層組合物中,且該離型劑將賦予黏合層之表面所要性質,且通常亦賦予自黏合層突出之顆粒的表面之部分。在其他實施例中,在將黏合層及顆粒塗佈於基底之表面上之後,將離型劑作為外塗層塗覆至分離層之表面。前一實施例常常為較佳的,此係因為其要求較簡單製程,且所得離型劑性質更牢
固地固著至分離層。
合適的離型劑(有時稱為低黏著力背面(「LBA」)塗層)之說明性實例包括揭示於美國專利第5,032,460號(Kantner等人)中之乙烯-聚矽氧共聚物。合適的離型劑之其他說明性實例包括含長鏈脂族之胺基甲酸酯共聚物、含長鏈脂族之丙烯酸酯共聚物、聚矽氧/聚脲共聚物,及聚矽氧聚醯胺共聚物。
所使用之LAB較佳為水可分散的,且產生獨特可回收之紙塗層。
在一些實施例中,本發明之物件將進一步包含黏著劑。該黏著劑通常為壓敏性黏著劑,其在室溫下通常具有黏性。取決於實施例,如預期應用所需要的,黏著劑可為永久性的、可重定位的或可釋放的。用於本發明之物件中的通常較佳類別之黏著劑為相對硬之丙烯酸系物。合適的壓敏性黏著劑之說明性實例包括選自由丙稀酸系物(諸如,可自UPM Raflatac獲得之辦公室標籤產品中的丙稀酸系物)組成之群的黏著劑。其他說明性實例包括微球黏著劑,諸如描述於WO 94/19420(Bilski等人)及美國專利第3,691,140號(Silver)及第5,045,569號(Delgado)中的黏著劑。熟習此項技術者將能夠選擇用於本發明中之合適的壓敏性黏著劑。
壓敏性黏著劑之層通常為連續的,但其可為不連續的。不連續塗層之說明性實例包括呈規則或不規則陣列之點、條帶等。黏著劑之厚度很大程度上將取決於物件之預期應用及其他組份之性質。熟習此項技術者將能夠容易選擇合適厚度。
本發明之物件的令人驚訝之效能範圍使得其可應用於大量應用中。
舉例而言,本發明之分離層的有利釋放性質准許本發明之物件
適合用作所謂的永久性黏著劑之離型襯墊。在需要時,此等實施例可以再漿化形式進行,藉此實現對此等離型襯墊之回收。此可持續實踐對於通常供現今之永久性黏著劑使用的傳統的塗有聚矽氧之離型襯墊而言為不可行的。
在其他實施例中,可藉由分離層獲得之良好可寫性准許將本發明之物件以帶墊形式用於薄片(例如,便箋墊、畫板墊等)。舉例而言,許多黏著畫板薄片墊使用黏著性相對強之黏著劑(以准許將移除式薄片牢固黏著至牆壁或其他表面),但在將薄片翻過畫板時,此等薄片可易於變得纏繞、起皺、撕裂等。以畫板薄片形式組態的本發明之物件可提供在整個第一(承載分離層之)表面上的所要可寫性,同時減少或消除上覆薄片上之黏著劑與下伏薄片前端的不良黏合。
在另一實施例中,本發明之物件可組態為可寫標籤,其中以堆疊或帶墊、無襯墊形式來配置塗佈在背面上之完全永久性黏著劑。在此等實施例中,分離層塗層將至少覆蓋下伏薄片之第一表面中對應於上覆薄片之第二表面之黏著劑覆蓋部分的部分。使用相對較小顆粒可為較佳的,以便增強可寫性質,但使用相對較小顆粒可傾向於損害所要釋放或分離性質。
在其他實施例中,本發明之物件可組態為膠帶,例如遮蔽膠帶等。本發明之分離層的令人驚訝之釋放性質准許此等膠帶在需要時由多種不同黏著劑塗層製成,其中在無任何離型襯墊情況下將膠帶自身捲繞成捲筒形式。
參考以下說明性實例可進一步理解本發明。
在實例之描述中使用若干縮寫,包括以下各者:
實例中使用以下原料。
實例中使用以下測試方法。
襯墊移除力(LRF):用10lb.滾筒以大約229cm/min.速率將分離層之已塗佈薄片樣品與來自UPM Raflatac的已移除襯墊之永久性膠紙辦公室標籤紙料(50lb.Jetlaser RP54、2.7密耳白色牛皮紙、3.5密耳厚之50不含木質素機制紙與經改質之丙烯酸永久性黏著劑及2.7密耳白色牛皮襯墊)的2.54×10.16cm條帶層壓兩遍。在測試初始值之前將經層壓之薄片儲存在恆溫(21℃)且相對濕度為50% RH之房間內至少3天。將經層壓之薄片之兩個額外集合儲存在48.8℃恆熱溫度之爐室內及21℃/80% RH恆定濕度腔室內歷時兩週。將樣品放回至21℃/50% RH房間內,且允許樣品在測試前平衡達至少24小時。藉由使用裝備有200lb.測力計之標準的Instron(英斯特)拉力測試機以30.5cm/min速率按90°剝離角自釋放表面剝離黏著標籤條帶,及在至少5cm剝離距離上進行積分來測試出襯墊移除力。將LRF資料點報導為5次重複之平均值(g/cm)。將永久性膠紙辦公室標籤紙料之樣品自身如上所述進行再層壓,且將其用作對照附體試片。
對高密度聚乙烯之再黏著力:以與以上LRF測試方法中之方式相同的方式來層壓及調節分離層之已塗佈薄片樣品。在如上所述量測LRF之後,將標籤黏著條帶重新黏附至5.1×12.7cm且厚度為0.48cm之高密度聚乙烯面板(來自Aeromat Plastic之應力消除的HPG等級之TROVIDURTM 600)。藉由以30.5cm/min.速率按90°剝離角自高密度聚
乙烯面板剝離黏著標籤條帶來測試對高密度聚乙烯之再黏著力。將再黏著力資料點報告為5次重複之平均值,以g/cm為單位。將來自UPM Raflatac的永久性膠紙辦公室標籤紙料之樣品自身如上進行再層壓,且將其用作對照附體試片。
可回收性測試:可藉由根據1999年2月申請之USPS實驗室回收協定-USPS文件來確定可回收性。手抄紙係遵循TAPPI T-205來製成。
將10克MR-30G及68克去離子水添加至8盎司玻璃瓶中。在藉由懸臂式攪拌器輕柔地混合之後,在攪拌下添加21.5公克JONCRYLTM 74A,使得黏合劑對顆粒重量比為1.05:1。最後,添加0.5公克NATROSOLTM 250H4R,且繼續攪拌大約15分鐘,直至溶液稠化從而得到21%固溶體為止。
藉由具有約7cm寬度及0.127mm高度之槽模將此混合物塗佈於3.5密耳厚度之白紙的大約15×60cm部分上。將已塗佈樣品置放於烘箱中在65.5℃下歷時15分鐘。接著,藉由Meyer桿RDS #3在已塗佈之部分上外塗10%固體KF-2001 LAB。樣品在烘箱中於65.5℃下再乾燥15分鐘之後,使樣品恢復室溫,且接著定性地評估樣品自永久性黏著劑之釋放及其可寫性效能。以類似方式進行實例2至19。
除了將組份在32盎司瓶中混合且用1%至1.25% NATROSOLTM 250H4R稠化之外,如實例1中所述製造實驗性塗層。
使用具有0.178mm槽高度及12.7cm開口之槽模將此等混合物塗佈至紙上,該槽模連接至蠕動泵,該蠕動泵具有2.24cc/rev之排量且配備有6.35mm標稱OD之直徑的管道。以9.2m/min.之捲速在31 RPM下泵送混合物。所量測之顆粒及黏合劑之塗佈乾重為11g/m2。
接著,用兩種方法中之任一種來外塗KF-2001。藉由具有0.127
mm槽高度及12.7cm開口之槽模來塗佈10%固體KF-2001 LAB溶液,該槽模連接至具有1.168cc/rev排量之Zenith泵。在22 RPM下塗佈溶液,產生約2.1g/m2之塗佈乾重。或者,藉由前向偏移凹版印刷式輥塗佈機(14.9 BCM輥)以7.6m/min捲速來塗佈25%固體KF-2001 LAB溶液,產生約2.0g/m2之塗佈乾重。藉由將該捲傳遞通過配備有設定在65.5℃下之4個紅外線乾燥用燈的直徑為1.2m之鋼輪,接著使其通過設定在149℃下之直徑為0.21m的兩個熱罐一次來達成對兩個塗層之乾燥。以類似方式進行實例21至24。
為製造永久性帶墊(無襯墊)標籤,使來自實例20之已塗佈輥的一部分在薄片之背面上塗佈有水基永久性黏著劑。將501公克水基丙烯酸乳膠PSA(由乳化聚合製備)及195公克AQUATACTM 6085添加至32盎司瓶中同時進行攪拌直至混合物變得均質。添加數滴10%氫氧化銨以使混合物之PH值為9。使用具有0.178mm槽高度及13.0cm開口之槽模將此含57%固體黏著劑之水塗佈於實例20之背面上,該槽模連接至蠕動泵,該蠕動泵具有2.24cc/rev之排量且配備有6.35mm標稱OD之直徑的管道。以9.2m/min之捲速在20 RPM下泵送混合物,產生約22微米之乾燥黏著劑厚度。以與上述方式相同之方式進行乾燥,且將經塗佈之薄片形成為個別15.2×25.4薄片且堆疊成永久性黏著標籤之墊。定性而言,一個薄片自標籤墊之另一薄片的釋放係容易的,且薄片之可寫性係評定為良好的。另外,一個薄片自另一薄片之釋放隨時間保持穩定。
在攪拌下將400公克30%固體KF-2001 LAB溶液、435公克去離子水及167公克JONCRYLTM 74A添加至1公升容器中,以產生LAB預混溶液。在劇烈攪拌下將68公克SPHERIGLASSTM 3000及427公克水添加至32盎司玻璃瓶中。接著,在攪拌下添加158公克JONCRYLTM 74A、75公克LAB預混物及6.5公克NATROSOLTM 250HHR,以產生實例
25。如上所述用以下各者製成另一樣品以產生實例26:36公克SUNPMMA S300、36公克SUNPMMATM S400、429公克去離子水、189公克JONCRYLTM 74A、75公克LAB預混物及6.5公克NATROSOLTM 250HHR。
使用具有0.178mm槽高度及12.7cm開口之槽模將此等混合物塗佈至紙上,該槽模連接至蠕動泵,該蠕動泵具有2.24cc/rev之排量且配備有6.35mm標稱OD之直徑的管道。以9.2m/min.之捲速在13 RPM及9.3 RPM下泵送混合物,從而分別得到實例25及26之顆粒、黏合劑及離型劑之所量測之塗佈乾重:11g/m2及8g/m2。藉由使該捲傳遞通過配備有設定在135℃下之4個紅外線乾燥用燈的直徑為1.2m之鋼輪來達成對兩個塗層之乾燥。
經由紙張銷毀機將來自實例23之18公克樣品切割成約0.64cm×28cm條帶。將此等條帶與342公克經類似切割之複寫紙進行混合。將該等紙帶置放於桶中,且添加2,040公克過濾水(其已用1mL 10% NaOH使pH值為10)。將桶中之內含物置放於溫度設定在40.6℃之Adirondack打漿機中。使打漿機之速度自10Hz逐漸提高至41Hz,且持續打漿4分鐘。重複此操作,且接著將速度減緩至20Hz,同時再添加4800ml的46.1℃的過濾水。在打漿5分鐘之後,將混合物轉移至大型容器,且添加足夠過濾水以使總容積達到37.8公升。將該混合物輕微混合15分鐘。在輕微攪拌以避免形成任何漩渦之情況下將此混合物之3,750mL樣品轉移至含有7,500mL冷的過濾水之18.9公升桶中。一部分此混合物用於製造依據Tappi T-205之若干手抄紙,該等手抄紙在50% RH下之直徑為15.2公分且重量為約1.2公克。如上所述使用2.7密耳來自上文所描述之UPM Raflatac永久性黏著辦公室標籤的白色牛皮襯墊來製造另一份18公克樣品。具有光增強之目視觀測結果指示在由襯墊樣品製成之手抄紙中存在許多不透明材料塊,而由分離層樣品(實例23)製成之手抄紙本質上不含此等不透明材料塊。
用於實例1至26之分離層
襯墊移除力及再黏著力資料
來自實例20至26
儘管已結合本發明之較佳實施例充分描述本發明,但應注意,各種改變及修改對於熟習此項技術者為顯而易見的。除非此等改變及修改偏離如由隨附申請專利範圍界定之本發明之範疇,否則此等改變及修改將理解為包括在該範疇內。本文中所引證之所有專利、專利文件及公開案之完整揭示內容均以引用的方式併入本文中。
Claims (11)
- 一種物件,其包含:(1)基底,其包含紙且具有第一表面;及(2)分離層,其位於該基底之該第一表面之至少一部分上,其中該分離層包含:具有自約-30℃至約+30℃之Tg之水可分散的黏合層,其具有部分地夾帶於其中且自其突出之顆粒;及離型劑。
- 如請求項1之物件,其中該基底具有第二表面,且進一步包含(3)位於該第二表面之至少一部分上的黏著劑。
- 如請求項1之物件,其中該等顆粒為實質上球形。
- 如請求項1之物件,其中該等顆粒具有自約5微米至約200微米之平均大小。
- 如請求項1之物件,其中該分離層具有約4:1之黏合劑與顆粒重量比。
- 如請求項1之物件,其中該分離層具有自約5g/m2至約15g/m2之塗佈乾重。
- 如請求項1之物件,其中該第一表面及該分離層塗層具有自約10微米至約50微米之平均H、自約50微米至約100微米之平均ECD及自約50微米至約150微米之平均NND。
- 如請求項1之物件,其中該第一表面及該分離層為可寫的。
- 一種用於製造如請求項1之物件的方法,其包含:提供具有第一表面之基底,及在該基底之該第一表面的至少一部分上形成分離層。
- 一種方法,其包含:(1)提供如請求項1之物件,其中該基底包含水可分散型材料,及在使用此物件之後,(2)將該物件置放於水中,(3)使該物件在水中分散,及(4)回收該基底材料。
- 如請求項10之方法,其中(i)該基底具有第二表面,且該物件進 一步包含在該第二表面之至少一部分上的黏著劑,及(ii)該物件位於包含以下兩者中之任一者的總成中:(A)該自身捲繞成捲筒形式之物件,及(B)該配置於類似物件之堆疊中之物件,在該堆疊中上覆物件之該第二表面與下伏物件之該第一表面接觸,且其中該方法進一步包含在將該物件置放於水中之前使該物件與該總成分離。
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