TWI764095B - 複合電泳粒子及含有其之可變透射膜 - Google Patents
複合電泳粒子及含有其之可變透射膜Info
- Publication number
- TWI764095B TWI764095B TW109105389A TW109105389A TWI764095B TW I764095 B TWI764095 B TW I764095B TW 109105389 A TW109105389 A TW 109105389A TW 109105389 A TW109105389 A TW 109105389A TW I764095 B TWI764095 B TW I764095B
- Authority
- TW
- Taiwan
- Prior art keywords
- composite particles
- suspending fluid
- particles
- charged composite
- charged
- Prior art date
Links
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Abstract
一種光電介質包括複數個在黏合劑中的微囊、含有密封微胞之聚合片,或在連續聚合相中的小滴。各微囊、微胞或小滴含有分散液,其包括複數個帶電複合粒子及懸浮流體,且該帶電粒子在電場影響下移動穿越該懸浮流體。該複合粒子包括一型或以上的顏料粒子,其至少部分塗有聚合材料。黏合劑、聚合片、連續聚合相、帶電複合粒子、及懸浮流體各有其折射率,且在550奈米,複合粒子與黏合劑、聚合片、連續聚合相、及溶劑至少之一的折射率之間相差小於或等於0.05。
Description
本申請案主張在2019年2月25日提出的美國專利申請案第62/809,978號之優先權,其全部納入作為參考。
本發明關於可變透射裝置。更特定而言,本發明關於含有電泳介質之可變透射裝置,其包含可改良可變透射裝置的光學性能之複合粒子。
光調變器為光電介質之潛在重要市場的代表。隨著建物及車輛的能量性能越來越重要,光電介質可被作為窗戶(包括屋頂天窗及車頂天窗)上的塗層,而可藉由改變光電介質的光學狀態而電子式控制穿透窗戶之入射輻射比例。此「可變透射性」(“VT”)技術在建物中的有效實作期望提供(1)降低炎熱天氣期間的不欲加熱效應,如此減少冷卻所需能量之量、空調設備大小、及尖峰電力需求;(2)增加天然日光之使用,如此減少用於照明的能量、及尖峰電力需求;及(3)藉由增加熱及視覺舒適感而提升乘客舒適感。甚至預期在上光表面對封閉體積的比例顯著大於典型建物之汽車中積累更大的效益。特定而言,VT技術在汽車中的有效實作被期望不僅提供上述效益,亦及(1)提升馬達運作安全性,(2)減少眩光,(3)強化照後鏡性能(因在照後鏡上使用光電塗層),及(4)提升使用抬頭顯示器的能力。VT技術之其他潛在應用包括防窺玻璃及電子裝置中的防眩光片。
美國專利第7,327,511號揭述可變透射裝置,其包括分布於非極性溶劑中且被封裝的帶電顏料粒子。這些可變透射裝置可藉AC驅動電壓驅動成為開放狀態,藉此將帶電顏料粒子被驅動到囊壁。因而此可變透射裝置可用於希望任意改變透射性的觀看表面,如建物之防窺玻璃、屋頂天窗及窗戶。
美國專利第7,327,511號亦揭述光調變器中各種為了性能最適化而調整電泳介質的重要因素。一重要因素為霧值最小化。在此申請案中,「霧值」表示擴散透射光(透射時散射之光)相較於總透射光的百分比。當設計可電子式切換開放、透明狀態到關閉、不透明狀態之光調變器時,希望透明狀態的霧值小於10%,更佳為小於2%。
用於VT裝置之顏料,例如碳黑,由散射及吸收共同衰減透射光。通常最小等級的碳黑粒子提供最有效的光衰減。光散射本性亦受這些粒子的凝集體大小影響。凝集體越大則前向散射光越多。此散射光造成窗戶有霧狀外觀。最小的粒子趨於有最小的凝集體且導致霧量最小。由於在VT應用中霧值較小較佳,故希望使用儘可能最小的粒子(或凝集體)大小。然而,粒子之電泳操縱隨其大小增加而改善,最小、最有效的阻光劑則非常難以控制。由於VT窗戶的切換速度及最終動態範圍亦為重要的參數,故希望為較大的粒子;因此在VT裝置中,基於粒度減小霧值的能力會受控制光學切換速度所需的最小粒度需求所限制。
基於封裝粒子之可變透射裝置可為雙穩態。術語「雙穩態」及「雙穩態性」在此以其在所屬技術領域之習知意義使用,以指稱包含具有至少一種光學性質不同的第一及第二顯示狀態之顯示元件之顯示器,使得在藉有限時間的定址脈衝驅動任何特定元件達到其假定的第一或第二狀態之後,在定址脈衝終止後該狀態會持續歷時改變該顯示元件狀態所需最短定址脈衝時間之至少數倍,例如至少4倍。雙穩態性可藉由添加絮凝劑(亦稱為耗竭劑)而強化,其誘發顏料-顏料與顏料-耗竭劑分子之間的滲透壓差。結果微囊內部的內相分離成為富顏料相及富耗竭劑相。然而,當囊為開放狀態時,富顏料相中的大顏料凝集體會造成散射及霧狀。
因此,現在需要改良雙穩態光電介質,其可被併入可變透射裝置中而具有可接受的切換速率及低霧值。
在一態樣中,一種光電介質包含複數個微囊於黏合劑中,該微囊含有分散液,該分散液包含複數個帶電複合粒子及懸浮流體,且該帶電複合粒子在電場影響下移動穿越該懸浮流體。該複合粒子包含一種或以上的顏料粒子,其選自由以下組成的群組:氧化錳鐵黑尖晶石、氧化銅鉻黑尖晶石、碳黑、及其組合,且至少部分塗有聚合材料。黏合劑、帶電複合粒子、及懸浮流體各有其折射率,且在550奈米,複合粒子與黏合劑及懸浮流體至少之一的折射率之間相差小於或等於0.05。
在另一態樣中,一種光電介質包含聚合片,其含有複數個密封微胞,各微胞含有分散液,該分散液包含複數個帶電複合粒子及懸浮流體,且該帶電複合粒子在電場影響下移動穿越該懸浮流體。該複合粒子包含一種或以上的顏料粒子,其選自由以下組成的群組:氧化錳鐵黑尖晶石、氧化銅鉻黑尖晶石、碳黑、及其組合,且至少部分塗有聚合材料。聚合片、帶電複合粒子、及懸浮流體各有其折射率,且在550奈米,複合粒子與聚合片及懸浮流體至少之一的折射率之間相差小於或等於0.05。
在又另一態樣中,一種光電介質包含複數個小滴於連續聚合相中,各小滴含有分散液,該分散液包含複數個帶電複合粒子及懸浮流體,且該帶電複合粒子在電場影響下移動穿越該懸浮流體。該複合粒子包含一種或以上的顏料粒子,其選自由以下組成的群組:氧化銅鉻黑尖晶石、氧化銅鉻黑尖晶石、碳黑、及其組合,且至少部分塗有聚合材料。連續聚合相、帶電複合粒子、及懸浮流體各有其折射率,且在550奈米,複合粒子與連續聚合相及懸浮流體至少之一的折射率之間相差小於或等於0.05。
本發明之這些及其他態樣鑒於以下說明而明白。
大致而言,本發明之各具體實施例提供一種光電介質,其包含帶電複合粒子及懸浮流體之封裝分散液,其中該帶電複合粒子在電場影響下移動穿越該懸浮流體。該複合粒子較佳為由嵌入聚合材料中的顏料粒子所構成。該介質的光學性質受顏料粒子型式與大小、及聚合塗層之型式與厚度所控制。該流體的折射率較佳為匹配該複合粒子的總折射率,使得複合粒子的大小不影響光散射,因此不促進霧化程度。同時該複合粒子大到足以提供良好的系統電泳控制。此外,聚合物塗層分離顏料粒子而抑制形成可能產生霧化之大凝集體。
對於可變透射裝置,其可將電泳裝置以圖1所描述的所謂「快門模式」操作,其中一操作狀態為實質上不透明及另一操作狀態為透光性。當在透明基材上建構此「快門模式」電泳裝置時,其可調節光通過裝置的透射性。
圖1之裝置10係以開放狀態描述。裝置10包括光電介質,其包含囊16於聚合黏合劑14中。囊16含有分散液,其包含回應電場而移動之帶電顏料粒子18於懸浮流體19中。囊16一般由以下詳述的明膠材料所形成。光電介質層較佳為鄰接一層透光導電材料,更佳為將光電介質層配置於第一與第二層透光導電材料層(如圖1之電極層11a, 11b)之間,其可由已知材料製造,如塗覆氧化銦錫(ITO)之聚對苯二甲酸伸乙酯(PET)。或者電極層可包含金屬電極,其可被排列作為像素。像素可如主動矩陣而可控制,因而可切換裝置的分離區域。額外的黏著層12一般存在於光電介質與電極層11a, 11b之一之間。該黏著層可為UV硬化性,且一般因填充由該囊產生的偏差而改良最終裝置的平面性。合適的黏著劑配方揭述於U.S. 2017/0022403號專利,其納入此處作為參考。裝置10可進一步在導電材料層11a, 11b之一的光電介質對立側上包含至少一種透光基材20;顯然可對各電極層提供此基材。
當對圖1之裝置10施加DC電場時,粒子18朝向觀看表面移動,因而將光學狀態從暗改變亮。在圖1中,當對電極11a, 11b之一施加交流電場時,帶電顏料粒子18被驅動到囊16之壁,且造成通過囊16的通孔而透光,即開放狀態。使用亦包括電荷控制劑及/或穩定劑之非極性溶劑作為懸浮流體19,則不必維持電場即可長時間(數週)維持光學狀態(開放/關閉)。結果,裝置可每日僅「切換」2次且消耗非常少的電力。在以下討論的快門模式裝置的情形,2個極端光學狀態可稱為「暗」及「明」或「開」及「關」。
許多讓渡予或為Massachusetts Institute of Technology (MIT)、E Ink Corporation、E Ink California, LLC、及相關公司之名的專利及申請案,揭述各種用於封裝的及微胞電泳以及其他光電介質之技術。封裝電泳介質包含許多小囊,其本身各包含含有電泳移動粒子於流體介質中的內相、及包圍該內相之囊壁。一般而言,該囊本身被保持在聚合黏合劑內而形成位於二電極之間的連貫層。在微胞電泳顯示器中,帶電粒子及流體未被封裝在微囊內,而是被保留在複數個於載體介質(一般為聚合膜)內形成的穴內。這些專利及申請案中所揭述的技術包括:
(a)電泳粒子、流體、及流體添加劑;參見例如美國專利第5,961,804、6,017,584、6,120,588、6,120,839、6,262,706、6,262,833、6,300,932、6,323,989、6,377,387、6,515,649、6,538,801、6,580,545、6,652,075、6,693,620、6,721,083、6,727,881、6,822,782、6,831,771、6,870,661、6,927,892、6,956,690、6,958,849、7,002,728、7,038,655、7,052,766、7,110,162、7,113,323、7,141,688、7,142,351、7,170,670、7,180,649、7,226,550、7,230,750、7,230,751、7,236,290、7,247,379、7,277,218、7,286,279、7,312,916、7,375,875、7,382,514、7,390,901、7,411,720、7,473,782、7,532,388、7,532,389、7,572,394、7,576,904、7,580,180、7,679,814、7,746,544、7,767,112、7,848,006、7,903,319、7,951,938、8,018,640、8,115,729、8,119,802、8,199,395、8,257,614、8,270,064、8,305,341、8,361,620、8,363,306、8,390,918、8,582,196、8,593,718、8,654,436、8,902,491、8,961,831、9,052,564、9,114,663、9,158,174、9,341,915、9,348,193、9,361,836、9,366,935、9,372,380、9,382,427、及9,423,666號;以及美國專利申請案公開第2003/0048522、2003/0151029、2003/0164480、2003/0169227、2003/0197916、2004/0030125、2005/0012980、2005/0136347、2006/0132896、2006/0281924、2007/0268567、2009/0009852、2009/0206499、2009/0225398、2010/0148385、2011/0217639、2012/0049125、2012/0112131、2013/0161565、2013/0193385、2013/0244149、2014/0011913、2014/0078024、2014/0078573、2014/0078576、2014/0078857、2014/0104674、2014/0231728、2014/0339481、2014/0347718、2015/0015932、2015/0177589、2015/0177590、2015/0185509、2015/0218384、2015/0241754、2015/0248045、2015/0301425、2015/0378236、2016/0139483、及2016/0170106號;
(b)囊、黏合劑、及封裝方法;參見例如美國專利第5,930,026、6,067,185、6,130,774、6,172,798、6,249,271、6,327,072、6,392,785、6,392,786、6,459,418、6,839,158、6,866,760、6,922,276、6,958,848、6,987,603、7,061,663、7,071,913、7,079,305、7,109,968、7,110,164、7,184,197、7,202,991、7,242,513、7,304,634、7,339,715、7,391,555、7,411,719、7,477,444、7,561,324、7,848,007、7,910,175、7,952,790、7,955,532、8,035,886、8,129,655、8,446,664、及9,005,494號;以及美國專利申請案公開第2005/0156340、2007/0091417、2008/0130092、2009/0122389、及2011/0286081號;
(c)微胞結構、壁材料、及形成微胞之方法;參見例如美國專利第7,072,095及9,279,906號;
(d)填充及密封微胞之方法;參見例如美國專利第7,144,942及7,715,088號;
(e)含有光電材料之膜及次組裝件;參見例如美國專利第6,982,178及7,839,564號;
(f)背板、黏著層、以及其他用於顯示器之輔助層及方法;參見例如美國專利第7,116,318及7,535,624號;
(g)色彩形成及色彩調整;參見例如美國專利第7,075,502及7,839,564號;
(h)驅動顯示器之方法;參見例如美國專利第7,012,600及7,453,445號;及
(i)顯示器之應用;參見例如美國專利第7,312,784及8,009,348號。
許多上述專利及申請案認知到,封裝電泳介質中包圍分離微囊之壁可被連續相取代,如此製造所謂的經聚合物分散電泳顯示器,其中電泳介質包含複數個電泳流體之分離小滴、及聚合材料之連續相,且在此經聚合物分散電泳顯示器內的電泳流體之分離小滴可被視為囊或微囊,即使無分離的囊膜連結各個別小滴;參見例如上述美國專利第6,866,760及7,079,305號。因而為了本申請案之目的,此經聚合物分散電泳介質被視為封裝電泳介質之次類。
帶電顏料粒子可為各種顏色及組成物。另外,帶電顏料粒子可以表面聚合物進行官能化以改良狀態穩定性。此顏料揭述於美國專利公開第2016/0085132號,其全部納入作為參考。例如若帶電粒子為白色,則其可由無機顏料所形成,如TiO2
、ZrO2
、ZnO、Al2
O3
、Sb2
O3
、BaSO4
、PbSO4
等。其亦可為折射率高(在550奈米>1.5)及具有特定大小(>100奈米)以呈現白色之聚合物粒子,或經改造而具有所欲折射率之複合粒子。黑色帶電粒子可由CI顏料黑26或28等(例如氧化錳鐵黑尖晶石或氧化銅鉻黑尖晶石)或碳黑所形成。其他的顏色(非白及非黑)可由有機顏料所形成,如CI顏料PR 254、PR122、PR149、PG36、PG58、PG7、PB28、PB15:3、PY83、PY138、PY150、PY155或PY20。其他的實例包括Clariant Hostaperm紅D3G 70-EDS、Hostaperm粉紅E-EDS、PV堅牢紅D3G、Hostaperm紅D3G 70、Hostaperm藍B2G-EDS、Hostaperm黃H4G-EDS、Novoperm黃HR-70-EDS、Hostaperm綠GNX、BASF Irgazine紅L 3630、Cinquasia紅L 4100 HD、與Irgazin紅L 3660 HD;Sun Chemical酞青藍、酞青綠、二芳基黃、或二芳基AAOT黃。亦可由無機顏料形成彩色粒子,如CI顏料藍28、CI顏料綠50、CI顏料黃227等。帶電粒子的表面可經基於所需的粒子電荷極性及電荷程度之已知技術進行修改,如美國專利第6,822,782、7,002,728、9,366,935、及9,372,380號,以及美國專利公開第2014-0011913號所揭述,其內容均全部納入此處作為參考。
該粒子可呈現負電荷,或者其可明確使用電荷控制劑而帶電,或者當被懸浮於溶劑或溶劑混合物中時可獲得電荷。合適的電荷控制劑在所屬技術領域為已知的;其本質可為聚合性或非聚合性,或者可為離子性或非離子性。電荷控制劑之實例可包括但不限於Solsperse 17000(活性聚合分散劑)、Solsperse 9000(活性聚合分散劑)、OLOA® 11000(琥珀醯亞胺無灰分散劑)、Unithox 750(乙氧化物)、Span 85(去水山梨醇三油酸酯)、Petronate L(磺酸鈉)、Alcolec LV30(大豆卵磷脂)、Petrostep B100(石油磺酸鹽)或B70(磺酸鋇)、Aerosol OT、聚異丁烯衍生物或聚(乙烯-共聚-丁烯)衍生物等。除了懸浮流體及帶電顏料粒子,內相亦可包括穩定劑、界面活性劑及電荷控制劑。穩定化材料當被分散於溶劑中時可被吸附在帶電顏料粒子上。此穩定化材料將粒子保持彼此分離,使得當粒子處於其分散狀態時,該可變透射介質為實質上非透射性。
本發明之一態樣提供一種含有複合顏料粒子之光電介質,其在絮凝劑存在下具有可調整表面電荷及低霧值,及製造該複合顏料粒子之方法。該複合粒子可在非極性溶劑中經由晶種分散液聚合而合成,使得有機聚合物被沈積在晶種粒子表面上,如圖2A所圖示地描述。生成複合粒子的尺寸為電泳及介電泳切換有效之數百奈米的級數,亦藉耗竭絮凝為而狀態穩定。該顏料粒子較佳為具有約0.01至0.2微米的直徑,且塗覆在顏料粒子表面上的聚合材料可具有約0.5至2微米的厚度,更佳為約0.3至0.7微米的厚度。該複合粒子總直徑可小於5微米,更佳為約0.5至2微米,且最佳為約0.5至1微米。
依照本發明之第一具體實施例的複合顏料粒子可在可易於與其他成分混合而製造適合封裝製程之內相的非極性溶劑中合成。不欲受理論約束,據信藉由將晶種顏料嵌入聚合基質中,顏料的光電性質與其表面特徵及電荷性質脫鈎。結果顏料粒子的折射率可以亦改良顏料粒子之移動性(motility)的方式而被修改。
在第一步驟中,稠密懸浮液係藉由將顏料粒子於一種非極性溶劑、或二種或以上的溶劑的混合物中研磨而製備。溶劑之實例包括但不限於脂肪族烴,如庚烷、辛烷,及石油餾液,如Isopar® (Exxon Mobil)或Isane® (Total);萜烯,如檸檬烯,例如1-檸檬烯;及芳香族烴,如甲苯。選用的界面活性劑可被併入分散液中以輔助研磨製程(例如1.0克界面活性劑/克顏料)。懸浮液可含有10至50重量百分比之顏料粒子,更佳為15至35重量百分比,且最佳為約25重量百分比。
其次可將顏料懸浮液以溶劑(如Isopar E或己烷)及前述的選用電荷控制劑稀釋,使得顏料濃度小於15重量百分比,更佳為小於10重量百分比,且最佳為小於約6.0重量百分比。較佳為懸浮液中非極性溶劑對稀釋溶劑的重量比例小於或等於20.0重量百分比。
在第三步驟中,將經稀釋懸浮液攪拌及加熱之後添加一種或以上的單體及/或寡聚物的混合物、及一種或以上的起始劑。單體溶液對顏料的體積比例,V 聚合物
/V 晶種
,較佳為約1.0至約10.0。單體混合物較佳為包含至少三種不同的單體,其包括但不限於丙烯酸酯與甲基丙烯酸酯(例如甲基丙烯酸甲酯、己二醇二甲基丙烯酸酯、甲基丙烯酸三氟乙酯、甲基丙烯酸三甲氧基矽烷基丙酯、甲基丙烯酸三級丁酯、甲基丙烯酸異丁酯、甲基丙烯酸苄酯、甲基丙烯酸2-氟乙酯、丙烯酸三氟乙酯、丙烯酸七氟丁酯、丙烯酸七氟異丙酯、丙烯酸2-甲氧基乙酯)、及其寡聚物。可包括於單體混合物中的起始劑包括但不限於偶氮貳異丁腈、2,2’-偶氮貳(2,4-二甲基)戊腈、過氧化苯甲醯基、過氧基新癸酸三級丁酯、過氧基二碳酸二異丙酯、過氧化甲基乙基酮、過氧基三甲乙酸三級丁酯、及其組合。單體混合物中起始劑的濃度按總單體重量計較佳為小於或等於約5%,更佳為小於或等於約3%,且最佳為小於或等於約1.5重量百分比。參考圖2A,將含有顏料粒子26、非極性溶劑22、單體、起始劑、與電荷控制劑的混合物20加熱且攪拌而進行單體聚合,使得顏料粒子26為至少部分,較佳為完全塗有生成聚合物24而形成複合粒子。在聚合後可將複合粒子清洗及乾燥。
依照本發明之第二具體實施例的另一種製備複合粒子之方法利用水性製程。在第一步驟中,若需要,將顏料粒子分散於水溶液中而形成含有選用分散劑之奈米分散相(NDP),且將聚乙亞胺(“PEI”)加入至NDP。在第二步驟中,將NDP乳化至苯甲酸丙酯及/或苯甲酸甲酯之非極性連續相中,其中溶有界面活性劑聚(羥基硬脂酸)(“PHSA”)。在第三步驟中,將含有苯乙烯/順丁烯二酐(“SMA”)共聚物於苯甲酸丙酯及/或苯甲酸甲酯中的溶液加入至該乳液,且可將SMA共聚物以PEI反應,使得界面反應產物形成包圍水性顏料分散液小滴之膠體網絡或殼。該界面反應之示意圖描述於第2B圖。在選用第四步驟中,複合物(即具有PEI-SMA殼之水性顏料分散液)的表面因添加月桂醯氯而被官能化。月桂醯氯與PEI中的任何未反應胺基進行反應,且使複合物表面更為疏水性。
上述水性製程可在許多方面進行修改。例如可將PEI以另一種在550奈米的折射率為約1.5,且具有足以由界面反應製造膠體網絡的胺官能基之水溶性含胺化合物取代。類似地可將SMA以另一種在550奈米的折射率為約1.5,且具有足以促進膠體網絡的酐官能基之聚合物取代。此外,SMA的折射率或疏水性可藉由形成訂製共聚物而調整,訂製共聚物係藉由修改苯乙烯及/或順丁烯二酐之量,或將其他單聚單元併入共聚物(如乙烯、甲基丙烯酸月桂酯、或甲基丙烯酸三氟乙酯)中而被合成。在一例示性具體實施例中,可將顏料粒子塗以在550奈米的折射率大於或等於1.5之聚合材料,雖然亦意圖為較大的折射率範圍,例如大於或等於1.43、1.44、1.45、1.46、1.47、1.48、或1.49。除非另有所述,否則在此報告的折射率範圍係在20℃至30℃之間的溫度下測量。
依分散複合粒子之溶劑的最終選擇而定,亦希望在界面反應之前修改SMA。例如如果欲將複合粒子最終分散於烷屬烴中,如Isopar,則可將烷屬烴基加入至SMA以改良其在溶劑中的相容性。最後顏料粒子可被分散於甘油或其他多醇中形成NDP,而非形成水性分散液。
所屬技術領域已知,將帶電粒子(如上所述,一般為碳黑)分散於低介電常數溶劑中可使用界面活性劑輔助。此界面活性劑一般包含極性「頭基」、及相容或溶於溶劑的非極性「尾基」。在本發明中較佳為非極性尾基為飽和或不飽和烴部分,或其他溶於烴溶劑之基,例如聚(二烷基矽氧烷)。該極性基可為任何極性有機官能基,包括離子性材料,如銨、磺酸或膦酸鹽,或酸性或鹼性基。特佳頭基為羧酸或羧酸基。適合用於本發明之穩定劑包括聚異丁烯與聚苯乙烯。在一些具體實施例中添加分散劑,如聚異丁烯琥珀醯亞胺及/或去水山梨醇三油酸酯及/或2-己基癸酸。
用於本發明之可變透射介質的流體一般為低介電常數(較佳為小於10且希望為小於3)。該流體較佳為黏度低,折射率相當高,成本低,反應性低,及蒸氣壓低/沸點高的溶劑。懸浮流體較佳為液體,但是電泳介質可使用氣體流體製造;參見例如Kitamura, T.等人之“Electrical toner movement for electronic paper-like display”, IDW Japan, 2001, Paper HCS1-1,及Yamaguchi, Y.等人之“Toner display using insulative particles charged triboelectrically”, IDW Japan, 2001, Paper AMD4-4)。亦參見美國專利第7,321,459及7,236,291號。
可被併入依照本發明之各具體實施例的光電介質的懸浮流體中的溶劑之實例包括但不限於脂肪族烴,如庚烷、辛烷,及石油餾液,如Isopar® (Exxon Mobil)或Isane® (Total);萜烯,如檸檬烯,例如1-檸檬烯;及芳香族烴,如甲苯。特佳溶劑為檸檬烯,因為其兼具低介電常數(2.3)及相當高的折射率(1.47)。內相的折射率可藉由添加折射率匹配劑而修改。例如上述美國專利第7,679,814號揭述一種適合用於可變透射裝置之電泳介質,其中包圍電泳粒子之流體包含部分氫化芳香族烴與萜烯的混合物,較佳混合物為d-檸檬烯與部分氫化聯三苯,其由Cargille-Sacher Laboratories, 55 Commerce Rd, Cedar Grove N.J. 07009以Cargille® 5040市售。依照本發明之各具體實施例製造的封裝介質中,較佳為封裝分散液的折射率僅可能接近地匹配封裝材料以降低霧值。在大部分的情況,內相在550奈米的折射率為至少1.50,更佳為在550奈米為1.51至1.57之間,且最佳為在550奈米為約1.54為有益的。
在本發明之一較佳具體實施例中,該封裝流體可包含一種或以上的非共軛烯烴,較佳為環狀烴。非共軛烯烴之實例包括但不限於萜烯,如檸檬烯;苯基環己烷;苯甲酸己酯;環十二碳三烯;1,5-二甲基四氫萘;部分氫化聯三苯,如Cargille® 5040;苯基甲基矽氧烷寡聚物;及其組合。依照本發明之一具體實施例的封裝流體之最佳組成物包含環十二碳三烯與部分氫化聯三苯。
用於該可變透射裝置之基於明膠的囊壁已揭述於許多上述的E Ink及MIT專利及申請案。明膠得自各供應商,如Sigma Aldrich或Gelitia USA。依應用所需,其可以許多等級及純度而得。明膠主要包含取自動物製品(牛、豬、家禽、魚)並水解之膠原。其包含肽與蛋白質的混合物。在此所述的許多具體實施例中將明膠組合亞拉伯膠(阿拉伯膠),其衍生自阿拉伯樹的硬化樹液。亞拉伯膠為醣蛋白與多醣的複雜混合物,且經常被作為食品穩定劑。亞拉伯膠與明膠之水溶液的pH可經調整形成可封裝非極性內相小滴的富聚合物凝聚相,如下所述。
帶有明膠/亞拉伯膠之囊可如下製備,參見例如美國專利第7,170,670號,其全部納入此處作為參考。在此方法中,將明膠及/或亞拉伯膠的水性混合物以烴內相(或其欲封裝的其他水不互溶相)乳化而將內相封裝。該溶液可在乳化前被加熱到40℃以溶解明膠。在得到所欲的滴度分布之後,一般將pH降低以形成凝聚物。控制乳液之冷卻及混合而形成囊,一般為室溫或更低。如果潤濕及散布條件正確,其主要由內相組成物決定,則為將內相小滴周圍的凝聚物以均勻方式分離膠化之適當的混合及特定的封裝配方(例如明膠及亞拉伯膠濃度及pH)。該方法產生20-100微米範圍之囊,且經常將超過50%之起始材料併入可用囊中。然後藉由篩選或其他的大小篩除選別法,將產生之囊按大小分離。大於100微米之囊一般被篩除,因為其為肉眼可見的,且囊越大則電極間隙增加,其提高所需的驅動電壓。
在大小篩除選別之後,可將囊混合黏合劑而製造塗漿,例如使用縫式塗覆、刀塗、旋塗等。該黏合劑在550奈米的折射率較佳為至少1.5。黏合劑材料之實例包括但不限於水溶性聚合物(例如多醣、聚乙烯醇、N-甲基吡咯啶酮、N-乙烯基吡咯啶酮、各種Carbowax®系列(Union Carbide, Danbury, Conn.)、及聚丙烯酸-2-羥基乙酯)、水系聚合物(例如聚胺基甲酸酯乳膠,視情況複合一種或以上的丙烯系、聚酯、聚碳酸酯、或聚矽氧)、油溶性聚合物、熱固性及熱塑性聚合物、輻射硬化性聚合物、及其組合。尤其是現已發現,魚膠與多價陰離子(如亞拉伯膠)的混合物為用於由(豬)明膠與亞拉伯膠的凝聚物所形成之囊的優良黏合劑。可包括於具有魚膠之黏合劑中的多價陰離子包括但不限於碳水化合物聚合物,如澱粉與纖維素衍生物、植物萃取物(例如亞拉伯膠)、及多醣(例如藻酸鹽);蛋白質,如明膠或乳清蛋白;脂質,如蠟或磷脂;及其組合。在本發明之一些具體實施例中,該電泳介質的囊對黏合劑重量比例可為約15:1至約50:1。在本發明之其他具體實施例中,該電泳介質可含有更高比例的黏合劑,如至少每15重量份的囊為1重量份的黏合劑,到至多每4重量份的囊為1重量份的黏合劑。
被併入上述分散液中的複合粒子的折射率可經調整以匹配懸浮流體及黏合劑至少之一的折射率。較佳為黏合劑、帶電複合粒子、及懸浮流體各有其折射率,且在550奈米,複合粒子與黏合劑及懸浮流體至少之一的折射率之間相差小於或等於0.05。更佳為在550奈米,複合粒子的折射率與黏合劑及懸浮流體兩者的折射率之間相差小於或等於0.05。
如上所示,除了微封裝,本發明之各具體實施例可將電泳分散液併入經聚合物分散層中,其中將複數個電泳流體分離小滴分散於聚合材料連續相內。在經聚合物分散層中,該帶電複合粒子、懸浮流體、及連續相較佳為有其折射率,且在550奈米,複合粒子的折射率與連續聚合物相及懸浮流體至少之一(較佳為兩者)的折射率之間相差小於或等於0.05。或者該電泳流體可被密封在複數個由聚合片形成的微胞中,其中在550奈米,複合粒子的折射率與懸浮流體及聚合片至少之一(較佳為兩者)的折射率之間相差小於或等於0.05。實施例
現在提出實施例以顯示本發明之較佳複合粒子的細節,其僅為例證。
[實施例1]
首先製備碳黑(Raven 3500,由Birla Carbon U.S.A. Inc. of Marietta, GA製造)於檸檬烯與OLOA11000中的懸浮液。將含濃度為25重量百分比之碳黑及12.5重量百分比之OLOA11000的懸浮液分散及研磨,直到碳黑粒度為約120奈米。然後使用該懸浮液製備兩組複合粒子。
第一組複合粒子係使用1.5的V 聚合物
/V 晶種
比例混合150克之懸浮液與570.0克之Isopar E,繼而將稀釋懸浮液加熱,並將其混合44.99克之甲基丙烯酸甲酯(MMA)、5.62克之己二醇二甲基丙烯酸酯(HDDM)、5.62克之甲基丙烯酸三氟乙酯(TFEM)、與0.84克之偶氮貳異丁腈的單體混合物而製備(最初)。聚合後將複合粒子清洗及乾燥。
第二組複合粒子係使用2.0的V 聚合物
/V 晶種
比例混合75克之懸浮液與570.0克之Isopar E,繼而將稀釋懸浮液加熱,並將其混合37.49克之甲基丙烯酸甲酯、4.69克之己二醇二甲基丙烯酸酯、4.69克之甲基丙烯酸三氟乙酯、與0.70克之偶氮貳異丁腈的單體混合物而製備。聚合後將複合粒子清洗及乾燥。
生成複合粒子的微結構可在圖3A及3B的穿透式電子顯微相片中觀察到。圖3A中使用較低體積比例1.5製造的複合粒子僅被部分塗覆,而圖3B中使用較高體積比例2.0製造的粒子完全被聚合物包覆。
[實施例2]
使用碳黑(Raven 1200,由Birla Carbon U.S.A. Inc. of Marietta, GA製造)於檸檬烯與OLOA11000中製備第二懸浮液。將含濃度為25重量百分比之碳黑及12.5重量百分比之OLOA11000的懸浮液分散及研磨,直到碳黑粒度為約115奈米。
為了檢驗電荷控制劑(CCA)濃度對複合粒子的影響,使用與實施例1中第一組複合粒子相同的步驟製備各複合粒子樣品,除了對一些樣品稍微修改顏料懸浮液及單體之型式與量。用以製造各樣品的顏料懸浮液之型式與量(克數),以及單體之型式與量(克數),提供於下表:
*甲基丙烯酸三甲氧基矽烷基丙酯
Raven 3500 懸浮液 | Raven 1200 懸浮液 | MMA | TFEM | TMSPM* | HDDM | 圖4A中的符號 | 圖4B中的符號 |
150 | -- | 50.62 | -- | -- | 5.62 | ||
150 | -- | 47.81 | 2.81 | -- | 5.62 | ||
150 | -- | 44.99 | -- | 5.62 | 5.62 | ||
-- | 150 | 44.99 | 5.62 | -- | 5.62 |
製備4種分別為5重量百分比之分散液,其各含有依照表1所述步驟製備的複合粒子之一組於檸檬烯中。亦製備2種對照樣品,Raven 3500於檸檬烯中的5重量百分比之懸浮液、及Raven 1200於檸檬烯中的5重量百分比之懸浮液。各複合粒子的帶電能力係使用Acoustosizer II X及M(Colloidal Dynamics)測量懸浮液的音速、密度、及黏度而測定。以此資料計算顏料粒子之仄他電位能。為了監測仄他電位能如何隨CCA負載改變,將分散液藉由添加0.02毫升之起始劑量及額外的CCA而滴定。圖4A及4B中含有Raven 3500之對照懸浮液之仄他電位能的圖係使用符號“□”表示,及圖4B中含有Raven 1200之對照懸浮液之仄他電位能的圖係使用符號“○”表示。
參考圖4A及4B的結果觀察到,CCA量增加,含有Raven 3500之對照懸浮液之仄他電位能呈現非常小的變化。然而,當以官能基單體(如甲基丙烯酸三氟乙酯或甲基丙烯酸三甲氧基矽烷基丙酯)共聚合時,觀察到帶電程度之戲劇性增加。例如如圖4A所示,在CCA對複合粒子(10毫克/克)的質量為大約20百分比,含有聚(MMA-共聚-TMSPM)之複合粒子之仄他電位能下降到約-130毫伏。當將帶電程度不同的兩種不同型式的碳黑顏料塗以相同的共聚物組成物,生成粒子顯示類似的帶電程度,如圖4B中封裝於聚(MMA-共聚-TFEM)中的Raven 3500與Raven 1200顏料。由此測量斷定複合粒子之表面電位能為可調整,且會受構成複合粒子之殼及基質之單體型式所支配。
[實施例3]
為了測定顏料粒子對霧值的影響,使用依照實施例2製備的包含Raven 3500封裝於MMA-TFEM共聚物中的顏料粒子,來製備於檸檬烯中的1.0重量百分比之混成顏料分散液。亦製備碳黑(Raven 3500)之1.0重量百分比之分散液的第二對照樣品。然後在有或無凝固絮凝聚合物(聚苯乙烯,Mw~35,000)之下,將兩種分散液的樣品各以溶劑混合物(1/1 w/w之氫化聯三苯/檸檬烯)稀釋,使得樣品的顏料濃度為從0.5至0.01重量百分比。混合各樣品且倒入透明液體容器中,及絮凝10分鐘之後使用分光光度計(CM-3600A, Konica Minolta)測量光通過容器的透射率及霧值。圖5為對照樣品(正方形符號)及複合顏料粒子(圓形符號),在有(實心符號)及無(空心符號)絮凝聚合物下之霧值相對透射率資料的作圖。如圖5所描述,該複合顏料粒子在絮凝聚合物存在下表現比對照樣品接近無絮凝聚合物之分散液。
[實施例4]
水性製程1:首先使用預先分散顏料Cab-o-Jet 465M洋紅色或450C青色(收到為於水中的15重量百分比之分散液)、或乾燥Emperor 2000碳黑(收到為乾燥粉末),形成NDP。將顏料摻合到分散劑溶液中,將碳黑以20重量百分比之顏料、及10重量百分比之分散劑Kolliphor P188,分散於水中,然後將混合物以超音波振盪。根據動態光散射所測量,此原料的粒度為約80奈米。將這些顏料分散液各摻合PEI(分支,1200 MW,得自Sigma)的50重量百分比之水溶液、及額外的水,最後成為包含5重量百分比之顏料、5重量百分比之PEI、2.5重量百分比之分散劑(若有),其餘為水的NDP。
其次在500毫升玻璃反應器中將10克之NDP乳化到100克之苯甲酸丙酯中,其首先在最初的粗乳化使用推進器,然後使用轉子-定子均化器(IKA 1公分轉子-定子以7,000-10,000 RPM運作3分鐘)達到最終滴度(droplet size)。在轉子-定子混合之後,其餘製程均以推進器在300 RPM恢復攪拌。
最後經由乳液液面下方的吸量管注射25克之SMA以1600 MW溶於1重量百分比之苯甲酸丙酯中歷時5-10分鐘,且持續攪拌至少60分鐘。
在第一步驟中,藉由添加10克之5重量百分比之月桂醯氯於苯甲酸丙酯中以反應PEI中的剩餘胺基,而將複合粒子疏水化,及將混合物持續攪拌60分鐘以上,然後將混合物轉移到聚丙烯瓶並在輥磨機上滾轉過夜。
水性製程2:重複水性製程1,除了對25克之1重量百分比之SMA於苯甲酸丙酯中添加3.3克之10重量百分比之油胺於苯甲酸丙酯中同時攪拌而修改SMA。使用此溶液(28.3克)作為水性製程1中25克之未修改SMA溶液的替代品。
圖6A(由經油胺官能化SMA製造的顏料複合物)及圖6B(未官能化SMA)提供生成複合粒子的顯微相片。比較顯微相片,以官能化SMA製備的粒子之微封裝成功率比使用未官能化SMA製備的粒子稍高。
在上述本發明之指定具體實施例中可進行許多變化及修改而不背離本發明之範圍,對所屬技術領域者為明顯的。因而以上說明全部以例證性而非限制性意義解讀。
所有上述專利及申請案的內容全部納入此處作為參考。
10:可變透射裝置
11a:電極層
11b:電極層
12:黏著層
14:聚合黏合劑
16:囊
18:帶電顏料粒子
19:懸浮流體
20:透光基材;含有顏料粒子26、非極性溶劑22、單體、起始劑、與電荷控制劑的混合物
22:非極性溶劑
24:生成聚合物
26:顏料粒子
圖式描述依照本發明概念之一種或以上的實作,其僅為舉例而絕非限制。
圖1為一種可變透射裝置的圖示,其包括第一及第二透光電極層,且將光電介質配置於層間。施加電場則粒子可移動鄰近囊壁,因而可使光通過該介質,即開放狀態。
圖2A為依照本發明之一具體實施例製造複合粒子之方法的示意圖。
圖2B為依照本發明之另一具體實施例製造複合粒子之第二方法的示意圖。
圖3A及3B為依照本發明之各具體實施例的複合粒子之微結構的穿透式電子顯微相片。
圖4A及4B為碳黑相對依照本發明之各具體實施例的複合顏料之仄他電位能為電荷控制劑濃度之函數的作圖。
圖5為含有本發明之一具體實施例的複合粒子、或顏料之封裝分散液,在有無絮凝聚合物下之霧值相對透射率的作圖。
圖6A及6B為使用依照本發明之另一具體實施例的水性製程製造的封裝複合粒子的顯微相片。
10:可變透射裝置
11a:電極層
11b:電極層
12:黏著層
14:聚合黏合劑
16:囊
18:帶電顏料粒子
19:懸浮流體
20:透光基材
Claims (11)
- 一種雙穩態光電介質,其包含黏合劑及複數個微囊,各微囊含有分散液,該分散液包含複數個帶電複合粒子及絮凝聚合物於懸浮流體中,該帶電複合粒子在電場影響下移動穿越該懸浮流體,且在該電場被移除後,該帶電複合粒子維持在該懸浮流體中的位置,其中該帶電複合粒子包含一種以上的至少部分塗有聚合材料之顏料粒子,該顏料粒子的直徑為0.01至0.2微米,該聚合材料包含甲基丙烯酸甲酯與甲基丙烯酸三氟乙酯的共聚物、或甲基丙烯酸甲酯與甲基丙烯酸三甲氧基矽烷基丙酯的共聚物,且該聚合材料的厚度為0.3至0.7微米,而該顏料粒子選自由以下組成的群組:氧化錳鐵黑尖晶石(manganese ferrite black spinel)、氧化銅鉻黑尖晶石(copper chromite black spinel)、碳黑、及其組合,及其中該黏合劑、該帶電複合粒子、及該懸浮流體各有其折射率,且在550奈米,該帶電複合粒子的折射率與該懸浮流體及該黏合劑的折射率之間相差小於或等於0.05。
- 如請求項1之雙穩態光電介質,其中在550奈米,各折射率大於或等於1.5。
- 如請求項1之雙穩態光電介質,其中該顏料粒子包含碳黑。
- 如請求項1之雙穩態光電介質,其中該懸浮流體包含選自由以下組成的群組之溶劑:脂肪族烴、萜烯、芳香族烴、及其組合。
- 如請求項1之雙穩態光電介質,其中該黏合劑選自由以下組成的群組:水溶性聚合物、水系聚合物、油溶性聚合物、熱固性及熱塑性聚合物、經輻射硬化聚合物、及其組合。
- 如請求項1之雙穩態光電介質,其中該黏合劑包含魚膠及多價陰離子。
- 如請求項1之雙穩態光電介質,其中微囊對黏合劑的重量比例為4:1至50:1。
- 一種可變透射膜,其包含如請求項1之雙穩態光電介質之層、及鄰接該雙穩態光電介質之層之透光導電材料層。
- 一種可變透射膜,其包含:第一及第二透光導電材料層;及如請求項1之雙穩態光電介質之層,其配置在該第一與該第二透光導電材料層之間。
- 一種雙穩態光電介質,其包含含有複數個密封微胞之聚合片,各微胞含有分散液,該分散液包含複數個帶電複合粒子及絮凝聚合物於懸浮流體中,該帶電複合粒子在電場影響下移動穿越該懸浮流體,且在該電場被移除後,該帶電複合粒子維持在該懸浮流體中的位置,其中該帶電複合粒子包含一種以上的至少部分塗有聚合材料之顏料粒子,該顏料粒子的直徑為0.01至0.2微米,該聚合材料係甲基丙烯酸甲酯與甲基丙烯酸三氟乙酯的共聚物、或甲基丙烯酸甲酯與甲基丙烯酸三甲氧基矽烷基丙酯的共聚物,且該聚合材料的厚度為0.3至0.7微米,而該顏料粒子選自由以下組成的群組:氧化錳鐵黑尖晶石、氧化銅鉻黑尖晶石、碳黑、及其組合,及 其中該聚合片、該帶電複合粒子、及該懸浮流體各有其折射率,且在550奈米,該帶電複合粒子的折射率與該懸浮流體及該聚合片的折射率之間相差小於或等於0.05。
- 一種雙穩態光電介質,其包含複數個於連續聚合相中的小滴,各小滴含有分散液,該分散液包含複數個帶電複合粒子及絮凝聚合物於懸浮流體中,該帶電複合粒子在電場影響下移動穿越該懸浮流體,且在該電場被移除後,該帶電複合粒子維持在該懸浮流體中的位置,其中該帶電複合粒子包含一種以上的至少部分塗有聚合材料之顏料粒子,該顏料粒子的直徑為0.01至0.2微米,該聚合材料係甲基丙烯酸甲酯與甲基丙烯酸三氟乙酯的共聚物、或甲基丙烯酸甲酯與甲基丙烯酸三甲氧基矽烷基丙酯的共聚物,且該聚合材料的厚度為0.3至0.7微米,而該顏料粒子選自由以下組成的群組:氧化錳鐵黑尖晶石、氧化銅鉻黑尖晶石、碳黑、及其組合,及其中該連續聚合相、該帶電複合粒子、及該懸浮流體各有其折射率,且在550奈米,該帶電複合粒子的折射率與該懸浮流體及該連續聚合相的折射率之間相差小於或等於0.05。
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US11567388B2 (en) | 2023-01-31 |
TW202102614A (zh) | 2021-01-16 |
US20200272017A1 (en) | 2020-08-27 |
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EP3931632A4 (en) | 2023-01-04 |
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