201232790 • 六、發明說明： 【發明所屬之技術領域】 ' 本發明係關於一種具有液晶聚酯層之太陽電池用背部 1 片材。此外亦關於一種使用此種太陽電池用背部片材所構 成之太陽電池模組。 【先前技術】 太陽電池模組通常具有在太陽電池元件的表侧（受光 面側）配置有表面保護片材且在内侧（與受光面相反面側） 配置有背部片材所成之構造，於第1圖表示其例。此例中 太陽電池元件3係以表側的密封層2與内侧的密封層4密 封，並且在表側的密封層2的外侧（表側）配置有表面保護 片材1，且在内侧的密封層4的外側（内側）配置有背部片 材5。此外，表面保護片材1及背部片材5之周圍部分係 以框架6固定。 專利文獻1及2中揭示因液晶聚酯膜水蒸氣遮蔽性優 異故作為背部片材使用。此外，專利文獻2中亦揭示於液 晶聚酯膜的内侧（表側）積層樹脂膜，並將此積層膜作為背 部片材使用。 [參考文獻] (專利文獻） 專利文獻1 :日本特開2002-64213號公報 專利文獻2 :日.本特開2006-324478號公報 【發明内容】 (發明欲解決之課題） 3 323576 201232790 如同專利文獻1及專利文獻2所揭示，以往具有液晶 . 聚酯層之太陽電池用背部片材其耐候性未必充足。故本發 f 明目的係提供一種具有液晶聚酯層且耐候性十分優異之太 陽電池用背部片材。 (解決課題之手段） 為達前述目的’本發明提供—種太陽電池用背部片材， 其係配置於太陽電池元件之内侧者，其具備：液晶聚酯層、 白色顏料含有層，且在液晶聚酯層内侧設置有白色顏料含 有層而成。 此外，本發明提供一種太陽電池模組，其係在太陽電 池元件的表侧配置表面保護片材，且在前述太陽電池元件 的内侧配置有前述太陽電池时部片材所構成。 (發明之效果） 本發明之太陽電池用背部片材其耐候性十分優異。 【實施方式】 ，實施型態太陽電池用背部片材係如第2圖所示為在 *§日層53的内側（與搭載太陽電池元件面相反之面侧 置在:k:色顏料含有層56所構成者’並且如第1圖所示配 電池元件3之内側（與受光面相反之面側）者。 液晶性之53之液晶聚醋係在熔融狀態卞顯示 液晶聚自旨可^液日/在觀以下的溫錄融者。此外， 聚黯碳酸略Ϊ =酿胺、可為液晶聚_、顺 ^ 為液晶聚酯亞胺。液晶聚酯較 323576 4 201232790 Λ201232790 • VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a back sheet for a solar cell having a liquid crystal polyester layer. There is also a solar cell module constructed using such a back sheet for a solar cell. [Prior Art] The solar cell module generally has a structure in which a surface protective sheet is disposed on the front side (light receiving surface side) of the solar cell element, and a back sheet is disposed on the inner side (the side opposite to the light receiving surface). Figure 1 shows an example. In this example, the solar cell element 3 is sealed with the inner sealing layer 4 by the front side sealing layer 2, and the surface protective sheet 1 is disposed on the outer side (front side) of the front side sealing layer 2, and the inner sealing layer 4 is provided. The back sheet 5 is disposed on the outer side (inner side). Further, the peripheral portions of the surface protection sheet 1 and the back sheet 5 are fixed by the frame 6. Patent Documents 1 and 2 disclose that the liquid crystal polyester film is used as a back sheet because of its excellent water vapor barrier properties. Further, Patent Document 2 discloses that a resin film is laminated on the inner side (front side) of the liquid crystal polyester film, and this laminated film is used as a back sheet. [References] (Patent Document) Patent Document 1: JP-A-2002-64213 Patent Document 2: Japanese Patent Application Laid-Open No. Hei. No. 2006-324478 (Summary of the Invention) 3 323576 201232790 As disclosed in the literature 1 and the patent document 2, the back sheet for solar cells having a liquid crystal polyester layer in the related art is not necessarily sufficient in weather resistance. Therefore, the purpose of the present invention is to provide a back sheet for a solar cell having a liquid crystal polyester layer and excellent weather resistance. (Means for Solving the Problem) The present invention provides a back sheet for a solar cell, which is disposed inside a solar cell element, and includes a liquid crystal polyester layer, a white pigment-containing layer, and a liquid crystal. A white pigment-containing layer is provided on the inner side of the polyester layer. Further, the present invention provides a solar battery module in which a surface protection sheet is disposed on the front side of a solar cell element, and a solar battery sheet is disposed inside the solar cell element. (Effect of the Invention) The back sheet for a solar cell of the present invention is excellent in weather resistance. [Embodiment] The back sheet for an embodiment of the solar cell is shown on the inside of the *§ day layer 53 as shown in Fig. 2 (on the side opposite to the surface on which the solar cell element is mounted: k: color pigment containing layer In the case of the 56th component, the inside of the battery element 3 (the side opposite to the light receiving surface) is shown in Fig. 1. The liquid crystal of the liquid crystal 53 is in a molten state, and the liquid crystal is displayed. In addition, the following is the temperature of the film. In addition, polyfluorene carbonate Ϊ Ϊ 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 酿 液晶 液晶 液晶 液晶 为 为 为 为 为 为 为 为 323 323 323 323 323
液晶㈣典型的例子可列舉如：由芳香族經基 • t㈣二鏡與由芳香族二醇、芳香隸基胺及芳香I 1 5所成群組選出之至少1種之化合物經聚合（聚縮合）所成 ’ ^複數種芳香她基㈣聚合所成者 ;芳香族二g @ ”由芳香H芳香贿基胺及芳香族二胺所成群!且選 出之至少1種之化合物經聚合賴者；以及聚對苯二甲酸 乙二酉旨等聚酉旨與芳香族經基緩酸經聚合所成者。在此 香族，基紐、芳香族二紐、芳香族二醇、芳香族經基 胺及芳香族二胺可各自獨立地使用其可聚合之衍生物取代 其一部份或全部。 芳㈣誠舰及料族二_之類具㈣基之化合 物之可聚合讀生物，其例可列舉如：絲轉換為烧氧基幾 基或芳氧基羰基所成者、羧基轉換為鹵甲鼴基（hal〇f〇rmyl) 所成者、以及羧基轉換為醢氧基羰基所成者。芳香族羥基 羧酸、芳香族二醇及芳香族羥基胺之類具有羥基之化合物 之可聚合之衍生物，其例可列舉如將羥基醯化轉換為醯氧 基所成者。芳香族羥基胺及芳香族二胺之類具有胺基之化 合物之可聚合之衍生物，其例可列舉如將胺基醢化轉換為 酿胺基所成者。 液晶聚酯具有下述式（1)所表示重複單元（以下稱為 「重複單元（1)」）、下述式（2)所表示重複單元（以下稱為 「重複單tg(2)」）、以及下述式（3)所表示重複單元（以下 稱為「重複單元（3)」），因其水蒸氣阻隔性優異故適合使 用0 323576 5 201232790 —〇〜Arl-CO- (1) —c〇 〜Ar2 —CO— (2) —〇〜Ar3 —0— (3)Typical examples of the liquid crystal (IV) include, for example, polymerization of at least one compound selected from the group consisting of aromatic diols, t-aryl groups, and aromatic I 1 5 ) formed into a 'multiple kinds of aromatic her base (four) polymerization; aromatic two g @ ” is a group of aromatic H aromatic brinic amines and aromatic diamines; and at least one selected compound is polymerized And poly(ethylene terephthalate) and the like. The aromatic group, the aromatic group, the aromatic diol, the aromatic sulfhydryl group The amine and the aromatic diamine may each independently replace a part or all of the polymerizable derivative thereof. The aromatic (4) Cheng Ship and the material group II may be a polymerizable read organism of the compound of the (4) group, for example, For example, the conversion of a silk to an alkoxy group or an aryloxycarbonyl group, the conversion of a carboxyl group to a halomethyl group (hal〇f〇rmyl), and the conversion of a carboxyl group to a decyloxycarbonyl group are exemplified. a compound having a hydroxyl group such as an aromatic hydroxycarboxylic acid, an aromatic diol, or an aromatic hydroxylamine Examples of the polymerized derivative include a polymerizable derivative of a compound having an amine group such as an aromatic hydroxylamine or an aromatic diamine, and examples thereof include a polymerizable derivative obtained by converting a hydroxy group into a decyloxy group. For example, the liquid crystal polyester has a repeating unit represented by the following formula (1) (hereinafter referred to as "repeating unit (1)"), and is represented by the following formula (2). The repeating unit (hereinafter referred to as "repeated single tg (2)") and the repeating unit represented by the following formula (3) (hereinafter referred to as "repeating unit (3)") are suitable for use because of excellent water vapor barrier properties. 0 323576 5 201232790 —〇~Arl-CO- (1) —c〇~Ar2 —CO— (2) —〇~Ar3 —0— (3)
Arl表示2,6-伸萘基、1，4-伸苯基或4,4’ -伸聯苯 基。Ar2及Ar3各自獨立地表示2, 6-伸萘基、1，4-伸苯基、 1，3-伸策基或4, 4’ -伸聯苯基。Arl、Ar2或Ar3所表示前 述基之氫原子（亦即’ 2, 6-伸萘基、1,4-伸苯基、1，3-伸苯 基或4, 4’ ~伸聯苯基中之氫原子）可各自獨立地經卣素原 子、碳數1至10之烷基或碳數6至20之芳基取代。 前述i素原子可列舉如：氟原子、氯原子、溴原子及 蛾原子。前述烷基之例可列舉如：曱基、乙基、正丙基、 異丙基、正丁基、異丁基、第二丁基、第三丁基、正己基、 2-乙基己基、正辛基及正癸基，其碳數通常為丨至1〇。前 述芳基之例可列舉如：苯基、鄰甲苯基、間甲苯基、對曱 苯基、卜萘基及2-萘基，其碳數通常為6至2〇。以該等基 取j刖述氫原子時，其數目於每一 Arl、Ar2及Ar3所表示 之前述基上各自獨立，輯常在2個以下，較佳為1個以 下。 …重複單元（1)係由特定的芳香族經基竣酸而來之重名Arl represents 2,6-anthracene, 1,4-phenylene or 4,4'-extended biphenyl. Ar2 and Ar3 each independently represent a 2,6-anthracene group, a 1,4-phenylene group, a 1,3-extension group or a 4,4'-extension biphenyl group. Arl, Ar2 or Ar3 represents a hydrogen atom of the above-mentioned group (that is, '2,6-anthracenyl, 1,4-phenylene, 1,3-phenylene or 4,4'-extended biphenyl) The hydrogen atom may be independently substituted with a halogen atom, an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 20 carbon atoms. Examples of the above-mentioned imine atom include a fluorine atom, a chlorine atom, a bromine atom, and a moth atom. Examples of the alkyl group include a mercapto group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a second butyl group, a t-butyl group, a n-hexyl group, and a 2-ethylhexyl group. The n-octyl and n-decyl groups usually have a carbon number of 丨 to 1〇. Examples of the aryl group include a phenyl group, an o-tolyl group, an m-tolyl group, a p-phenylene group, a naphthyl group and a 2-naphthyl group, and the carbon number thereof is usually 6 to 2 Å. When the hydrogen atoms are referred to by these groups, the number thereof is independent of each of the groups represented by each of Arl, Ar2 and Ar3, and is usually 2 or less, preferably 1 or less. ...the repeating unit (1) is a duplicate name derived from a specific aromatic carboxylic acid
St Μ 複單疋⑴較佳為AH為2,6一伸萘基者，亦即， 由6,基:2:萘甲酸而來之重複單元。 複，元(2)係φ特定的*香族酸* 元。重複單元（2)較 冬後， 0 ^ ^ _权佳為Ar2為2, 6-伸萘基者，亦即，这 2，6伸秦基一幾峻而來少舌选留 叩來之重複年元，以及Ar2為^-伸為 323576 6 201232790 ψ- 基者，亦即，由對苯二甲酸而來之重複單元。 ‘ 重複單元（3)係由特定的芳香族二醇而來之重複單元。 重複單元（3)較佳為Ar3為1，4-伸苯基者，亦即，由對苯 二酚（hydroquinone)而來之重複單元，以及αγ3為4,4，- 伸聯苯基者，亦即，由4, 4’ -二羥基聯苯而來之重複單元。 本實施型態之液晶聚酯層較佳為由液晶聚酯所構成之 層，該液晶聚酯係式（1)、（2)及（3)各別所表示重複單元中 至少1者含有2’ 6-伸萘基，且相對於全部重複單元之合計 量，該含有2, 6-伸萘基之重複單元之含量為4〇莫耳％以 上。 刖述液晶聚酯中，相對於全部重複單元之合計量（將構 成液晶聚S旨之各重複單元的質量除以各重複單^之式量， 藉此求得各重複單元之物質量當量（莫耳）並將其合計之 值）3有2, 6伸萘基之重複單元之含量（亦即，紅上為2, 6一 伸萘基之重複單元⑴、Ar2為2 6-伸萘基之重複單元⑵、St Μ Compound 疋 (1) is preferably a AH of 2,6-naphthyl group, that is, a repeating unit derived from 6, base: 2: naphthoic acid. Complex, element (2) is φ specific * aromatic acid * yuan. The repeating unit (2) is later than the winter, 0 ^ ^ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Years, and Ar2 is ^-extension to 323576 6 201232790 ψ-based, that is, repeating units derived from terephthalic acid. 'Repeating unit (3) is a repeating unit derived from a specific aromatic diol. The repeating unit (3) is preferably a 1,4-phenylene group in which Ar3 is a phenylene group, that is, a repeating unit derived from hydroquinone, and an αγ3 is a 4,4,-extended biphenyl group. That is, a repeating unit derived from 4,4'-dihydroxybiphenyl. The liquid crystal polyester layer of this embodiment is preferably a layer composed of a liquid crystal polyester, and at least one of the repeating units represented by each of the liquid crystal polyester systems (1), (2) and (3) contains 2'. 6-Naphthyl group, and the content of the repeating unit containing 2,6-anthranyl group is 4 〇 mol% or more with respect to the total amount of all repeating units. In the liquid crystal polyester, the total mass of each repeating unit is determined by dividing the mass of each repeating unit constituting the liquid crystal poly by the amount of each repeating unit, thereby obtaining the mass equivalent of each repeating unit ( Mohr) and its total value) 3 has a content of repeating units of 2,6-naphthyl (i.e., a repeating unit (1) of 2,6-extended naphthyl group, and a 6-naphthyl group of Ar2 Repeat unit (2),
Ar3為2, 6-伸祕之4複單元⑶之合計含量）較佳為鄕 以上。藉此可提高錢氣_性。此2, 6-伸萘基含量更佳 為50莫耳％以上，又审社* 莫耳％以上。 又更佳為6〇莫耳％以上，特佳為7。 此外刖述液晶聚g旨中，於全 量’重複單元⑴之含量較佳為3。至8。莫耳;= 4〇至7〇莫耳％ ’又更佳為45至65莫耳％。此外對 ，部重複單元之合計量，4複單元⑵^卜相 至35莫耳％’更佳為15㈣莫耳％，又更佳為17= 323576 7 201232790 27.=耳再者，相對於全部重複單元之 ‘單元，含量較佳為10至35莫耳％，更= •莫耳〇 ^更佳為17.5至27 5莫耳％。具有此 複单元組成之液晶聚酿其耐熱性 =相r:r)之含量與重複單元⑶心^ 二⑶以外之重;;:rr 曰1π„早兀，但相對於全部重複單元之合計 直，通4Η)莫耳％以下，較佳為5莫耳％以下。 耐熱性及炼融張力高之液晶聚酉旨之典型的例子如I . 相對於全部重複單元之合計量，ΑΗ為2, 6_ 耳酸而來之重複= 為40至74.8莫耳义，更佳為切至心莫耳％， 萘基之重複單_亦 莫耳％，更佳為Μ至30莫耳％，又更佳為Ά5至3〇 耳％ ;紅2為u_伸苯基之重複單元⑵（亦即，莫 甲酸而來之重複單元）較佳為〇.2至15莫耳 為本— 至12莫耳％，又更佳為2 $ ln曾甘〇/ 尺佳為0.5 基之重複單元（3X亦即，由對苯 為-至30莫耳％，更佳為17.=〇^早元）較佳 為:Α25莫耳且相對於^為= 7ϋ()及的為“—伸苯基之重複單元⑵之早 為伸萘基之重複單元⑵之含量較佳為^^，的 上，更佳為0.6倍莫耳以上。 倍莫耳以Ar3 is a total content of 2, 6-stretching 4 complex units (3), preferably 鄕 or more. This can increase the money _ sex. The content of the 2,6-anthracene group is more preferably 50% by mole or more, and more than % by mole. It is more preferably 6% or more of Mo, more preferably 7. Further, in the liquid crystal polymerization, the content of the total repeating unit (1) is preferably 3. To 8. Mohr; = 4 〇 to 7 〇 mol % ‘and more preferably 45 to 65 mol %. In addition, the total number of repeating units, 4 complex units (2) ^ phase to 35 mole % 'more preferably 15 (four) mole %, and more preferably 17 = 323576 7 201232790 27. = ear again, relative to all The unit of the repeating unit preferably has a content of 10 to 35 mol%, more preferably • a molar amount of 17.5 to 27 5 mol%. The liquid crystal polymer having the composition of the composite unit has heat resistance = phase r: r) and repeating unit (3) heart ^ 2 (3);;: rr 曰 1π„ early, but relative to the total of all repeating units 4通) Moule% or less, preferably 5 mol% or less. A typical example of a liquid crystal polycondensation having high heat resistance and a high refining tension is as shown in I. 6_ Repeats of ear acid = 40 to 74.8 Mo, more preferably cut to heart Mo, % repeat of naphthyl group - also MoM %, more preferably Μ to 30 mol %, and better It is Ά5 to 3〇%; red 2 is the repeating unit of the phenyl group (2) (that is, the repeating unit derived from molycolic acid) is preferably 〇.2 to 15 mol-based - to 12 mol% And more preferably 2 $ ln Zeng Ganzhen / 尺佳 is a 0.5 basis repeating unit (3X, that is, from benzene to - 30% by mole, more preferably 17. = 〇 ^ early) is preferably : Α25 mol and relative to ^ = 7 ϋ () and the repeating unit of "- phenyl repeating unit (2) is preferably a repeating unit of the naphthyl group (2), preferably more than 0.6, more preferably 0.6 More than Momo. Momo
S 323576 201232790 液曰曰曰較佳為藉由將單體溶融聚合，且將所得聚合 物（預聚物）固相聚合而製造。藉此可操作性良好的製造耐 熱似熔融張力高之液晶聚酯。熔融聚合可在觸媒存在下 進灯此觸媒之例.可列舉如：醋酸鎂、醋酸錫（⑴、欽駿 四丁酉日（tetrabutyl titanate)、醋m醋酸納、醋酸舒、 三氧化銻等金屬化合物；以及N，N—二曱基胺基吡啶、" 基味嗤等錢雜環式化合物，且較適合使用含氮雜環式化 合物。 液晶聚醋其流動開始溫度較佳為28(rc以上，更佳 290 C以上’又更佳為295。(：以上’此外，通常在38〇〇c : 下’較佳為35GC以下。流動開始溫度越高則越容易提升 耐熱性及熔融張力，但若過高則需以高溫使其熔融，成形 時變得容易熱劣化。 此外，SlL動開始溫度又稱為流動溫度（f 1 〇w temperature)，使用具有内徑imm、長度i〇丽之喷嘴之 毛細管流變計（rheometer)，在 9. 8MPa(100kg/cm2)荷重 下，以4°C/分鐘之升溫速度將液急聚酯之加熱熔融體由噴 嘴擠出時，顯示熔融黏度為4800Pa · s(48000泊（p〇ise)) 之溫度即流動溫度’係作為液晶聚g旨分子量之指標（參照小 出直之編輯「液晶聚合物-合成、成形、應用-」、CMC股份 公司、1987年6月5日、第95頁）。 液晶聚酯中可依其必要調配其他成份，亦可作為組成 物。其他成份之例可列舉如：填充材、液晶聚酯以外之熱 可塑性樹脂及添加劑。在組成物整體中液晶聚酯所佔比例 9 323576 201232790 較佳為80質量％以上，更佳為90質量％以上。 • 填充材的例子'可列舉如：磨碎玻璃纖維（milled glass w fiber)、短切玻璃纖維（cil〇pped giass fiber)等玻璃纖 維、欽酸鉀晶鬚（Potassium titanate whisker)、氧化鋁 晶鬚、硼酸鋁晶鬚、碳化矽晶鬚、氮化矽晶鬚等金屬或非 金屬系晶鬚類、玻璃珠（glass bead)、中空玻璃球、玻璃 杯末、雲母、滑石、黏土（cray)、氧化矽、氧化鋁、鈦酸 鉀、矽灰石（wollastonite)、碳酸鈣（重質、輕質、膠質等）、 碳酸鎂、鹼性碳酸鎂、硫酸鈉、硫酸鈣、硫酸鋇、亞硫酸 舞風氣化紹、氫氧化鎮、氫氧化約、>5夕酸弼、石夕砂、梦 石、石英、氧化鈦、氧化鋅、氧化鐵、石墨、鉬、石綿、 氧化矽-氡化鋁纖維、氧化鋁纖維、石膏纖維、碳纖維、碳 黑、白碳、矽藻土、皂土（bentonite)、絹雲母（sericite)、 白砂（shirasu)及黑鉛，依其必要可使用2種以上該等充填 材。其中適合使用玻璃纖維、雲母、滑石及碳纖維作為填 充材。 填充材依其必要可為經表面處理者。此表面處理劑的 例子可列舉如·石夕烧系偶合劑（sUane coupling agent)、 鈦酸醋系偶合劑、硼烷系偶合劑等反應性偶合劑；以及高 級脂肪酸、高級脂肪酸酯、高級脂肪酸金屬鹽、氟碳系界 面活性劑等潤滑劑。 液晶聚酯以外之熱可塑性樹脂的例子可列舉如：聚碳 酸醋、聚醯胺、聚礙（p〇lysulf〇ne)、聚苯硫鍵 (polyphenylene sul f ide)、聚苯醚（polyphenylene ether)、 10 323576 201232790 聚醚酮 樹脂 (po lye therke tone)及聚醚醯亞胺（pol yet herimide) soai 添加劑的例子可列舉如：氟樹脂、金屬皂（metallic ip)類等脫模改良劑、成核劑、抗氧化劑、安定劑、塑化 劑、助滑劑、抗著色劑、著色劑、紫外線吸收劑、抗靜電 劑、潤滑劑及阻燃剩。 將如此所仲之液晶聚酯或其組成物膜化，藉此可得液 晶聚酯膜，其係作為本實施型態太陽電池用背部片材之液 晶聚酯層53 ^膜化之方法例如可列舉如：擠出成形法 (extrusion forming)、壓製成形法（pressing f〇rmi叩）， 溶液澆鑄法（solution casting)及射出成形（injecti〇n forming)，較佳為擠出成形法。擠出成形法可列舉如τ模 頭（T-dies)法及吹塑（inflati〇n)法，τ模頭法 伸或雙轴延伸。 m 單軸延伸膜之延伸倍率（牵伸比⑷价m 二.…〇,較佳為i。至40,更佳為15至 二 :之㈣向㈣拘的延伸倍率輯 ^： 雙軸延伸膜之TD方向（盥樁屮古α +士 士 率通常。倍==直之方向)的延伸倍 借队塑膜之肋方向的延伸倍率（ raw _ ratl0) =氣泡拉取速度/樹脂止 =一徑/環狀隙縫徑)通常為“幻。，較= 液晶糊53輪較心謂⑽更佳為1〇 323576 11 201232790 至，又更佳為15至75"m。若過薄貝，j強度不足，若 過厚則可撓性不足。 液晶聚酯層53在溫度4(TC、相對溼度90%下所測定 之水蒸氣穿透度較佳為〇 lg/m2 · 24h以下，更佳為 0. 05g/m2 · 24h 以下。 於液晶聚酯層53中，可至少在一侧的面上設置水蒸氣 阻隔層54 °此外，雖第2圖之例子中水蒸氣阻隔層54設 置在液晶聚g旨層53的内侧，但亦可設置在液晶聚酯層53 的表侧（搭載太陽電池元件之面側），且亦可設置在液晶聚 酯層53之表侧與内侧。 構成水蒸氣阻隔層54之物質，較佳為由铭、石夕、欽、 站、錦、銅、鋅、銀及金所成群組選出至少1種 一素的單體、氧化物、氣化物及氧氮化物，依其必要可 、=A種以上該等物質。亦即，水蒸氣阻隔I 54較佳為由 化物下S1A)群之兀素的單體、選自下述（A)群之元素的氧 =元=(:二之:素的氮化物…^ 層。 成群組選出至少1種物質所構成的 金 (A)^ 鋁、矽、鈦、鉻、 鐵、銘、鎳、銅、鋅、銀或 水蒸氣阻隔層54之形成方、、 鑛法、離子鍍法等PVD、> 去例如可列舉.蒸鑛法、 CVD法等CVD沐、w s、々 衣LVD法、熱CVD法、雷 去、以及溶凝膠 法等濕式法。此外，可將 趺1)法、鍍覆法、塗 s 周製或取得之箔貼合在液 323576 201232790 聚酯膜。 水蒸氣陣隔層54的厚度較佳為5至250nm，更佳為40 至lOOnm。過薄則水蒸氣阻隔性之提升效果不足，過厚則 可撓性不足。 於液晶聚酯層53内側設有白色顏色含肴層π。藉此 可得耐候性優異之太陽電池用背部片材。此外，第2圖之 例子中雖然隔著接著層55設置白色顏料含有層56，但亦 可不隔著接著層55’而藉由例如熱熔著而設置白色顏料含 有層56。 白色顏料含有層56中所含之白色顏料，較佳為鹼性碳 ®^(2PbO)3 · Pb(GH)2(錯白）等）、驗性硫酸錯（2pbs〇4 · ::(:2等)、驗性矽酸鉛(pb2Si〇4 · Pb(〇H)2等)、氧化鋅 人L、硫化辞、辞鋼白（lith〇p〇ne)(硫化鋅與硫酸顧之混 i料。、二氧化錄及氧域，依其必要可使用2種以上白色 而2為自&顏料含有層56’可使用含白色顏料之樹脂膜 此樹月曰膜（即白色顏料含有層56中所含之樹脂） 人右^聚對苯二甲酸乙二酯(PET)等聚酯。相對於白色顏料 如#、曰56之總量，白色顏料含有層56中白色顏料之含量 Η為5至90質量％，更佳為1〇至8〇質量％。此外，白 ，料含有層56之厚度較佳為5至5_m，更1〇至 4〇〇^m〇 曰為了提高與密封層4之密著性以及賦予設計性，在液 晶聚酉旨層53的表侧可設置其他樹脂層，較佳為聚稀煙層 323576 13 201232790 5卜此外，第2圖之例子中雖然隔著接著層52設置聚稀煙 •層Η，但亦可不隔著接著層52，而藉由例如熱溶著而設置 聚烯烴層51。 構成聚稀烴層51之聚婦烴較佳為聚乙婦，更佳為低密 度聚乙婦(LDPE) ’又更佳為直鏈狀低密度聚乙稀⑽叩）。 聚烯烴層51較佳為使用聚烯烴膜而設置，為賦予設計性而 設置聚烯烴層51時，聚烯烴膜（即聚烯烴層51)可含有所 求顏色之顏料及染料。聚烯烴層51之厚度較佳為5至2〇〇 Am，更佳為1〇至i〇〇y ^。 如此所得之本實施型態太陽電池用背部片材係於其表 側設置密封層4，且製品型態可採用附有密封層之太陽電 池用背部片材。此外，此時通常以剝離膜保護密封層4之 表側（與背部片材相反面侧），旅於使用時（製造太陽電池模 組時）剝去剝離膜。 使用本實施型態太陽電池用背部片材所成太陽電池模 組係如第1圖所示，其係在太陽電池元件3表侧（受光面侧） 配置表面保護片材，且在太陽電池元件内侧（與受光面相反 面侧）配置本實施型態太陽電池用背部片材5所成者。 太陽電池元件3通常由複數個太陽電池單元（cell)、 聯繫太陽電池單元彼此之導線、連接太陽電池單元及電源 導出用端子盒之導線所構成。太陽電池單元可為單結晶矽 半導體、多結晶矽半導體、#晶系矽半導體、化合物半導 體或有機物系半導體。表面保護片材1適合使用玻璃板。 此外，太陽電池元件3較隹為以密封材密封。此密封材適 14 323576 201232790 合使用乙稀/醋酸乙烯酯共聚物（EVA)。此外，第1圖之例 子中雖在太陽電池元件3的表側與内側設置密封層2、4， 但在玻璃板的内面上直接配置太陽電池元件時，可僅設置 内侧之密封層4。 如此所得之本實施型態太陽電池模組，因具有耐候性 十分優異之背部片材，故其性能之維持性優異。 (實施例） [測定流動開始溫度] 使用流動試驗儀（島津製作所股份有限公司之 「CFT=500型」），將2g試料填充於安裝有内徑1 mm、長 度10mm之模具的毛細管型流變計，在9. 8MPa(100kgf/cm2) 荷重下，以4°C/分鐘之升溫速度一邊使試料熔融一邊擠 出，測定顯示熔融黏度為4800Pa · s(48000泊）之溫度。 [評估水蒸氣阻隔性] 以JISK7126(A法：差壓法）為基準，藉由氣體穿透率、 透濕度測定裝置（GTRTec股份有限公司「GTR-10X」），以 溫度40°C、相對溼度90%之條件測定水蒸氣穿透度。 [評估耐候性] 使用加速耐光性試驗機（SugaTest Instruments股份 有限公司「high energy xenon weather meter SC700-WN」）， 於背部片材以下述條件進行氙光照射並以目視觀察背部片 材之外觀。 波長：275nm以上連續光（藉由濾波器截去短波長側光） 強度：160W/m2(燈輸出） 15 323576 201232790 溫度：65°C (藉由與照射面同位置之平板溫度計而測定） 時間：60小時 (製造例1) 於具備有攪拌裝置、轉矩計（torquemeter)、氮氣導入 管、溫度計及迴流冷卻器之反應器内’加入6-羥基-2-萘 曱酸1034. 99g(5. 5莫耳）、2, 6-伸萘基二羧酸378.33g (1.75莫耳）、對苯二曱酸83.07g(0.5莫耳）、對苯二酚 272. 52g(2. 475莫耳；相對於2, 6-伸萘基二羧酸及對苯二 曱酸合計量過剩0.225莫耳）、醋酸酐1226.87g(12莫耳）、 及作為觸媒之1-曱基咪唑0. 17g，以氮氣取代反應器内的 氣體後，在氮氣氣流下一邊攪拌’一邊費時15分鐘由室溫 升溫至145°C，並於145°C迴流1小時。接著，一邊顧除副 產物之醋酸及未反應之醋酸酐’一邊費時3小時30分由 145°C升溫至31(TC，並在310°C維持3小時後，將内容物 取出並冷卻至室溫。以粉碎機將所得之固形物粉碎成粒經 約〇· 1至1mm後’在氮氣環境下’費時1小時由室溫升溫 至250X：，費時10小時由25(TC升溫至31〇。(：，並在310 C維持5小時，藉此進行固相聚合。固相聚合後冷卻而得 粉末狀的液晶聚酯。相對於全部重複單元之合計量，此液 晶聚酯具有人]^1為2,6-伸萘基之重複單元（1)55莫耳％、 八『2為2,6-伸萘基之重複單元（2)17.5莫耳％、紅2為1，4_ 伸笨基之重複單元（2)5莫耳％、及Ar3為1,4-伸苯基之 重複單元（3)22. 5莫耳％，且其流動開始溫度為333。匸。 (製造例2) 323576 16 201232790 於與製造例1相同之反應器内，加入對羥基笨甲峻 911g(6. 6莫尊）、異丁酸91§(0. 55莫耳）、對苯二甲酸274g (1.65莫耳）、4,4’ -二羥基聯苯409g(2. 2莫耳）、醋酸奸 1235g(12. 1莫耳）、及作為觸媒之1-曱基咪唑0. 17g，以 氮氣取代反應器内的氣體後，在氮氣氣流下一邊攪拌，— 邊費時15分鐘由室溫升溫至150°C，並於15(TC迴流1小 時。接著，添加曱基咪唑1. 7g後，一邊餾除副產物之 醋酸及未反應之醋酸酐，一邊費時2小時50分由15〇°c升 溫至320eC，在確認到轉矩上升之時間點將内容物取出並 冷卻至室溫。以粉碎機將所得固形物粉碎成粒徑約〇· 1至 1 _後，在氮氣環境下，費時1小時由室溫升溫至250¾， 並費時5小時由250°C升溫至285°C，並且在285。(：維持3 小時，藉此進行固相聚合。固相聚合後冷卻而得粉末狀的 液晶聚酯。此液晶聚酯之流動開始溫度為327°C。 (實施例1) 以雙軸擠出機（池貝股份有限公司「PCM-30」）將製造 例1所得液晶聚酯造粒成粒狀（pellet)後，供給至單軸擠 出機（螺桿徑50腿〇並熔融，由T模頭（模唇長度300 mm、 模唇間隙1 mm、模頭溫度350°C)擠出為膜狀並冷卻，而得 厚度25/zm之液晶聚酯膜。此液晶聚酯膜之水蒸氣穿透度 為 0. 011g/m2 · 24h。S 323576 201232790 Liquid helium is preferably produced by melt polymerization of a monomer and solid phase polymerization of the obtained polymer (prepolymer). Thereby, a liquid crystal polyester having high heat resistance like a high melt tension can be produced with good operability. Melt polymerization can be carried out in the presence of a catalyst. For example, magnesium acetate, tin acetate ((1), tetrabutyl titanate, vinegar, sodium acetate, acetic acid, antimony trioxide, etc. a metal compound; and a N,N-dimercaptoaminopyridine, a pharmaceutically acceptable heterocyclic compound, and a nitrogen-containing heterocyclic compound. The liquid crystal polyester has a flow initiation temperature of preferably 28 ( More than rc, more preferably 290 C or more, and even more preferably 295. (: Above 'In addition, usually below 38〇〇c: lower' is preferably 35GC or less. The higher the flow start temperature, the easier it is to improve heat resistance and melt tension. However, if it is too high, it needs to be melted at a high temperature, and it becomes easy to be thermally deteriorated during molding. In addition, the SlL start temperature is also called a flow temperature (f 1 〇w temperature), and the use has an inner diameter imm and a length i. The capillary rheometer of the nozzle exhibits a melt viscosity when the heated melt of the liquid urethane is extruded from the nozzle at a temperature increase rate of 4 ° C/min under a load of 9.8 MPa (100 kg/cm 2 ). The temperature is 4800 Pa · s (48000 poise) The degree is used as an index of the molecular weight of the liquid crystal. (Refer to "Editing Liquid Crystal Polymers - Synthesis, Forming, Application -", CMC Corporation, June 5, 1987, page 95). Other components may be blended as necessary, and may also be used as a composition. Examples of other components include fillers, thermoplastic resins other than liquid crystal polyester, and additives. The proportion of liquid crystal polyester in the entire composition is 9 323576 201232790 It is preferably 80% by mass or more, and more preferably 90% by mass or more. • Examples of the filler material include glass such as milled glass w fiber and chopped gibbs fiber. Metal or non-metallic whiskers, glass bead, etc., such as fiber, Potassium titanate whisker, alumina whisker, aluminum borate whisker, tantalum carbide whisker, tantalum nitride whisker, Hollow glass spheres, glass ends, mica, talc, clay (cray), cerium oxide, aluminum oxide, potassium titanate, wollastonite, calcium carbonate (heavy, light, colloid, etc.), magnesium carbonate, Alkali Magnesium carbonate, sodium sulfate, calcium sulfate, barium sulfate, sulfite gas, gasification, hydrogenation, hydrogenation, > Iron oxide, graphite, molybdenum, asbestos, yttrium oxide-tellurized aluminum fiber, alumina fiber, gypsum fiber, carbon fiber, carbon black, white carbon, diatomaceous earth, bentonite, sericite, white sand ( Shirasu) and black lead, two or more of these fillers can be used as necessary. Among them, glass fiber, mica, talc and carbon fiber are suitable as fillers. The filler material may be surface treated as necessary. Examples of the surface treatment agent include reactive couplers such as a sUane coupling agent, a titanate coupling agent, and a borane coupling agent; and higher fatty acids, higher fatty acid esters, and higher grades. A lubricant such as a fatty acid metal salt or a fluorocarbon surfactant. Examples of the thermoplastic resin other than the liquid crystal polyester include, for example, polycarbonate, polyamide, polyphenylene sul f ide, polyphenylene ether, and polyphenylene ether. 10 323576 201232790 Examples of polyether ketone resin (po lye therke tone) and pol yet herimide soai additives include, for example, fluororesin, metal ip, and other release modifiers. Nuclear agents, antioxidants, stabilizers, plasticizers, slip agents, anti-staining agents, colorants, UV absorbers, antistatic agents, lubricants and flame retardant residues. The liquid crystal polyester film or a composition thereof is obtained by film-forming, and a liquid crystal polyester film is obtained as a method of film-forming the liquid crystal polyester layer 53 of the back sheet for solar cells of the present embodiment. For example, extrusion forming, pressing f〇rmi叩, solution casting, and injection molding, preferably extrusion molding. Examples of the extrusion molding method include a T-dies method and an inflating method, a τ die stretching or a biaxial stretching. m Extension ratio of uniaxially stretched film (draw ratio (4) valence m 2 .. 〇, preferably i. to 40, more preferably 15 to 2: (4) to (4) stretch extension ratio series: biaxially stretched film The extension of the TD direction (盥 屮 屮 α α α 通常 通常 通常 倍 倍 = = = = = = = = = = raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw raw / ring gap diameter) is usually "magic., compared with the liquid crystal paste 53 rounds of the heart (10) is better than 1 〇 323576 11 201232790 to, and more preferably 15 to 75 " m. If too thin shell, j strength is insufficient If the thickness is too thick, the flexibility is insufficient. The liquid crystal polyester layer 53 preferably has a water vapor permeability of 〇 lg / m 2 · 24h or less, more preferably 0. 05g/m2 · 24h or less. In the liquid crystal polyester layer 53, the water vapor barrier layer 54 may be provided on at least one surface. Further, in the example of Fig. 2, the water vapor barrier layer 54 is provided in the liquid crystal polymerization layer. The inner side of the layer 53 may be provided on the front side of the liquid crystal polyester layer 53 (the side on which the solar cell element is mounted), and may be provided on the front side and the inner side of the liquid crystal polyester layer 53. The substance constituting the water vapor barrier layer 54 is preferably a monomer, an oxide or a vaporized one selected from the group consisting of Ming, Shi Xi, Qin, Station, Jin, Cu, Zinc, Silver and Gold. And the oxynitride, if necessary, = A or more of these substances. That is, the water vapor barrier I 54 is preferably a monomer of the halogen group of the group S1A), selected from the group (A) below. The oxygen of the element = element = (: two: the nitride of the element ... ^ layer. The group consists of at least one substance composed of gold (A) ^ aluminum, tantalum, titanium, chromium, iron, Ming, nickel, Examples of the formation of copper, zinc, silver or water vapor barrier layer 54, PVD, etc. by mineralization, ion plating, etc., for example, CVD, steaming, CVD, CVD, etc. Wet method such as CVD method, Ray removal, and lyogel method. In addition, the 趺1) method, the plating method, the coating s Weekly or the obtained foil can be applied to the liquid 323576 201232790 polyester film. The thickness of the spacer 54 is preferably from 5 to 250 nm, more preferably from 40 to 100 nm. If the thickness is too thin, the effect of improving the water vapor barrier property is insufficient, and if the thickness is too thick, the flexibility is insufficient. On the inner side of the liquid crystal polyester layer 53 There is a white color containing the vegetable layer π. Thereby, the back sheet for solar cells excellent in weather resistance can be obtained. Further, in the example of Fig. 2, the white pigment-containing layer 56 is provided via the adhesive layer 55, but it is not necessary to The layer 55' is provided with a white pigment-containing layer 56 by, for example, heat fusion. The white pigment contains a white pigment contained in the layer 56, preferably an alkaline carbon®(2PbO)3 · Pb(GH)2 (wrong) White), etc., test sulfuric acid error (2pbs〇4 · ::(:2, etc.), test lead citrate (pb2Si〇4 · Pb(〇H)2, etc.), zinc oxide human L, vulcanization words, words Steel white (lith〇p〇ne) (zinc sulfide and sulfuric acid mixed with the material. And the oxygen dioxide field and the oxygen field, if necessary, two or more kinds of white may be used, and 2 is a & pigment-containing layer 56'. A resin film containing a white pigment may be used, which is a white pigment-containing layer 56. Containing resin) Polyester such as polyethylene terephthalate (PET). The content of the white pigment in the white pigment-containing layer 56 is from 5 to 90% by mass, more preferably from 1 to 8% by mass, based on the total amount of the white pigments such as # and 曰56. Further, the white material-containing layer 56 preferably has a thickness of 5 to 5 mm, more preferably 1 to 4 mm, in order to improve adhesion to the sealing layer 4 and impart design properties, in the liquid crystal polymerization layer 53 The other side of the front side may be provided with a resin layer, preferably a thick smoke layer 323576 13 201232790 5 . In addition, in the example of Fig. 2, although the thin smoke layer layer is disposed via the back layer 52, the back layer may not be interposed. 52, and the polyolefin layer 51 is provided by, for example, heat dissolution. The polyglycol which constitutes the polyolefin layer 51 is preferably a polyethylene, more preferably a low density polyethylene (LDPE) and more preferably a linear low density polyethylene (10). The polyolefin layer 51 is preferably provided using a polyolefin film. When the polyolefin layer 51 is provided to impart design properties, the polyolefin film (i.e., the polyolefin layer 51) may contain a pigment and a dye of a desired color. The thickness of the polyolefin layer 51 is preferably 5 to 2 Å Am, more preferably 1 Å to i 〇〇 y ^. The back sheet for solar cell of the present embodiment thus obtained is provided with a sealing layer 4 on the front side thereof, and the back sheet of the solar cell with a sealing layer may be used as the product type. Further, at this time, the front side (the side opposite to the back sheet) of the sealing layer 4 is usually protected by a release film, and the release film is peeled off during use (when the solar cell module is manufactured). As shown in Fig. 1, the solar cell module formed by the back sheet for solar cell of the present embodiment is provided with a surface protective sheet on the front side (light receiving surface side) of the solar cell element 3, and in the solar cell element. The inner side (the side opposite to the light receiving surface) is disposed on the back sheet 5 for a solar cell of the present embodiment. The solar cell element 3 is usually composed of a plurality of solar cells, a wire connecting the solar cells to each other, and a wire connecting the solar cell unit and the terminal block for power supply. The solar cell unit may be a single crystal germanium semiconductor, a polycrystalline germanium semiconductor, a germanium germanium semiconductor, a compound semiconductor or an organic semiconductor. The surface protection sheet 1 is suitable for use with a glass plate. Further, the solar cell element 3 is more sealed with a sealing material. This sealing material is suitable for use in ethylene/vinyl acetate copolymer (EVA). Further, in the example of Fig. 1, the sealing layers 2 and 4 are provided on the front side and the inner side of the solar cell element 3. However, when the solar cell element is directly disposed on the inner surface of the glass sheet, only the inner sealing layer 4 may be provided. The solar cell module of the present embodiment thus obtained is excellent in the maintenance of performance because it has a back sheet which is excellent in weather resistance. (Example) [Measurement of flow start temperature] Using a flow tester ("CFT=500 type" of Shimadzu Corporation,), 2 g of the sample was filled in a capillary type rheology in which a mold having an inner diameter of 1 mm and a length of 10 mm was attached. The sample was extruded while melting at a rate of 4 ° C/min under a load of 9.8 MPa (100 kgf/cm 2 ), and a temperature at which the melt viscosity was 4,800 Pa·s (48,000 poise) was measured. [Evaluation of water vapor barrier property] JISK7126 (A method: differential pressure method), based on gas permeability and moisture permeability measuring device (GTRTec Co., Ltd. "GTR-10X"), at a temperature of 40 ° C, relative The water vapor permeability was measured under the condition of a humidity of 90%. [Evaluation of weather resistance] Using an accelerated light resistance tester ("high energy xenon weather meter SC700-WN"), the back sheet was subjected to calender irradiation under the following conditions, and the appearance of the back sheet was visually observed. Wavelength: continuous light above 275nm (by short-wavelength side light by filter) Intensity: 160W/m2 (lamp output) 15 323576 201232790 Temperature: 65°C (measured by a flat-panel thermometer in the same position as the illuminated surface) Time : 60 hours (manufacturing example 1) In a reactor equipped with a stirring device, a torque meter, a nitrogen gas introduction tube, a thermometer, and a reflux condenser, '6-hydroxy-2-naphthoic acid 1034. 99 g (5) was added. 5 摩尔), 2,6-exetylenedicarboxylic acid 378.33g (1.75 moles), terephthalic acid 83.07g (0.5 moles), hydroquinone 272. 52g (2. 475 moles 17g。 [2,6-extended naphthalene dicarboxylic acid and terephthalic acid total excess 0.225 moles), acetic anhydride 1226.87g (12 moles), and as a catalyst 1-mercaptoimidazole 0. 17g After replacing the gas in the reactor with nitrogen gas, the mixture was heated to room temperature for 145 ° C for 15 minutes while stirring under a nitrogen gas stream, and refluxed at 145 ° C for 1 hour. Then, while taking care of acetic acid and unreacted acetic anhydride of by-products, the temperature was raised from 145 ° C to 31 (TC) at 3 hours and 30 minutes, and after maintaining at 310 ° C for 3 hours, the contents were taken out and cooled to the chamber. The solid matter obtained by the pulverizer was pulverized into granules for about 1 to 1 mm, and then heated under a nitrogen atmosphere for 1 hour from room temperature to 250X: it was heated from 25 (TC to 31 Torr for 10 hours). (:, and maintained at 310 C for 5 hours, thereby performing solid phase polymerization. The solid phase polymerization is followed by cooling to obtain a powdery liquid crystal polyester. The liquid crystal polyester has a total amount of the total repeating unit. The repeating unit of 2,6-anthranyl group (1) 55 mol%, 八"2 is a repeating unit of 2,6-anthranyl group (2) 17.5 mol%, red 2 is 1,4_ stupid base The repeating unit (2) 5 mol %, and Ar3 is a repeating unit of 1,4-phenylene group (3) 22.5 mol%, and its flow initiation temperature is 333. 制造. (Production Example 2) 323576 16 201232790 In the same reactor as in Production Example 1, hydroxyglycol 911g (6.6 mol), isobutyric acid 91 § (0.55 mol), and terephthalic acid 274 g (1.65 mol) were added. ) 4,4'-dihydroxybiphenyl 409g (2.2 moles), acetic acid 1235g (1. 1 mole), and 1-mercaptoimidazole as a catalyst 0. 17g, replaced by nitrogen in the reactor After the gas was stirred under a nitrogen gas stream, the temperature was raised from room temperature to 150 ° C for 15 minutes, and refluxed for 15 hours at 15 ° C. Then, after adding thiol imidazole 1. 7 g, the by-product was distilled off. Acetic acid and unreacted acetic anhydride were heated from 15 ° C to 320 ° C in 2 hours and 50 minutes, and the contents were taken out and cooled to room temperature at the time when the torque was confirmed to be increased. The obtained solid matter was pulverized by a pulverizer. After the particle size is about 〇·1 to 1 _, it is heated from room temperature to 2503⁄4 in a nitrogen atmosphere for 1 hour, and it takes 50 hours from 250 °C to 285 °C for 5 hours, and at 285. (: 3 hours, The solid phase polymerization was carried out by the solid phase polymerization, followed by cooling to obtain a powdery liquid crystal polyester. The liquid crystal polyester had a flow initiation temperature of 327 ° C. (Example 1) A twin screw extruder (Chibei Co., Ltd.) "PCM-30") The liquid crystal polyester obtained in Production Example 1 was granulated into pellets, and then supplied to a single-axis extruder ( The rod diameter is 50 legs and melted. The T die (length 300 mm, lip gap 1 mm, die temperature 350 ° C) is extruded into a film and cooled to obtain a liquid crystal polyester with a thickness of 25/zm. The film has a water vapor permeability of 0. 011g/m2 · 24h.
於厚度25〇era之白色PET膜（toray股份有限公司 「Lumirror E20」：含有氧化鈦）的單面塗佈氨基甲酸乙酯 系接著劑（三井武田化學股份有限公司：主劑「TAKELAC 17 323576 201232790 A511」/硬化劑「A50」=10/1(質量比）），並將先前所得之 液晶聚酯膜貼合而得到積層膜。接著，在此積層膜之液晶 聚酯膜面塗佈氨基曱酸乙酯系接著劑（同上），並將積層厚 度50 # m之LLDPE膜與厚度50 y m之EVA膜所成之積層膜， 以LLDPE面側貼合而得背部片材。藉由從所得背部片材之 白色PET膜側照射氙光，評價其耐候性，其結果並未發現 翹曲等形狀變化或破損。 (實施例2) 除了使用製造例2所得液晶聚酯取代製造例1所得液 晶聚酯以外，進行與實施例1相同之操作而得到厚度25//m 之液晶聚醋膜。此液晶聚酯膜之水蒸氣穿透度為〇.343g/ m2 · 24h 〇 使用所得之液晶聚酯膜進行與實施例1相同之操作而 得到背部片材。藉由從所得背部片材之白色PET膜侧照射 氙光，評價其耐候性，其結果並未發現翹曲等形狀變化或 破損。 (比較例1) 除了不使用白色PET膜以外，進行與實施例1相同之 操作而得到背部片材。藉由從所得背部片材之液晶聚酯膜 侧照射氙光，評價其耐候性，其結果並未發現破損，但發 現有很大的龜曲。 (比較例2) 除了不使用白色PET膜以外，進行與實施例2相同之 操作而得到背部片材。藉由從所得背部片材之液晶聚酯膜 18 323576 201232790 側照射氙光，評價其耐候性，其結果發現有很大的翹曲， 且亦發現有破損。 (產業上之可利用性） 根據本發明可提供一種耐候性優異之太陽電池用背部 片材、以及使用其所成之太陽電池模組。 【圖式簡單說明】 第1圖係示意的表示太陽電池模組之例子之截面圖。 第2圖係示意的表示本實施型態的太陽能電池用背部 片材之例子之截面圖。 【主要元件符號說明】 1 表面保護片材 2 ' 4 密封層 3 太陽電池元件 5 背部片材 6 框架 51 聚稀烴層 52、55 接著層 53 液晶聚醋層 54 水蒸氣阻隔層 56 白色顏料含有層 19 323576Single-coated urethane-based adhesive for white PET film (toray Co., Ltd. "Lumirror E20": containing titanium oxide) having a thickness of 25 〇era (Mitsui Takeda Chemical Co., Ltd.: main agent "TAKELAC 17 323576 201232790 A511"/hardener "A50" = 10/1 (mass ratio)), and the previously obtained liquid crystal polyester film was bonded together to obtain a laminated film. Next, an aminoguanidine ethyl ester-based adhesive (the same as above) was applied to the surface of the liquid crystal polyester film of the laminated film, and a laminated film of a 50 mm thick LLDPE film and an EVA film having a thickness of 50 μm was laminated. The LLDPE is laminated on the side to obtain a back sheet. The weather resistance was evaluated by illuminating the white PET film side of the obtained back sheet, and as a result, no shape change or breakage such as warpage was observed. (Example 2) A liquid crystal polyester film having a thickness of 25 / / m was obtained by the same operation as in Example 1 except that the liquid crystal polyester obtained in Production Example 2 was used instead of the liquid crystal polyester obtained in Production Example 1. The liquid crystal polyester film had a water vapor permeability of 343.343 g / m 2 · 24 h. The same operation as in Example 1 was carried out using the obtained liquid crystal polyester film to obtain a back sheet. The weather resistance was evaluated by illuminating the white PET film side of the obtained back sheet, and as a result, no shape change or breakage such as warpage was observed. (Comparative Example 1) A back sheet was obtained in the same manner as in Example 1 except that the white PET film was not used. The weathering property was evaluated by irradiating the liquid crystal polyester film side of the obtained back sheet, and the weather resistance was evaluated. As a result, no breakage was observed, but a large tortuosity was observed. (Comparative Example 2) A back sheet was obtained in the same manner as in Example 2 except that the white PET film was not used. The weathering property was evaluated by illuminating the liquid crystal polyester film 18 323576 201232790 from the side of the obtained back sheet, and as a result, it was found that there was a large warpage and damage was also observed. (Industrial Applicability) According to the present invention, it is possible to provide a back sheet for solar cells excellent in weather resistance and a solar cell module using the same. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing an example of a solar battery module. Fig. 2 is a cross-sectional view showing an example of a back sheet for a solar cell of the present embodiment. [Description of main component symbols] 1 Surface protection sheet 2 ' 4 Sealing layer 3 Solar cell component 5 Back sheet 6 Frame 51 Polycarbon layer 52, 55 Next layer 53 Liquid crystal layer 54 Water vapor barrier layer 56 White pigment contains Layer 19 323576