TW201006690A - Eraser - Google Patents
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- TW201006690A TW201006690A TW98117402A TW98117402A TW201006690A TW 201006690 A TW201006690 A TW 201006690A TW 98117402 A TW98117402 A TW 98117402A TW 98117402 A TW98117402 A TW 98117402A TW 201006690 A TW201006690 A TW 201006690A
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- eraser
- polyisocyanate
- weight
- diisocyanate
- castor oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L19/00—Erasers, rubbers, or erasing devices; Holders therefor
- B43L19/0025—Eraser or rubber material, e.g. comprising hard particles
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- Compositions Of Macromolecular Compounds (AREA)
- Polyurethanes Or Polyureas (AREA)
- Paints Or Removers (AREA)
Abstract
Description
201006690 六、發明說明： 【發明所屬之技術領域】 其代表者係擦拭紙面上以 本發明係有關一種橡皮擦， 鉛筆晝成的筆跡並將其消去者。 【先前技術】 基材而構成，此類橡 ’在擦拭紙面上之筆 般之污垢，而有容易 以往之橡皮擦係以軟質橡膠做為 皮擦之消字性能雖優異，但另201006690 VI. Description of the invention: [Technical field to which the invention pertains] The representative of the invention is a wiping paper surface. The present invention relates to an eraser, a pencil-entangled handwriting and the elimination thereof. [Prior Art] It is composed of a substrate, and the rubber is easy to wipe the surface of the paper, and it is easy to use. The eraser has a good eraser performance as a soft rubber, but another
跡時，由於橡皮擦之表面易附著石墨 弄髒紙面等之問題。 ’’ 因此’近年來即廣泛地使用―種以軟質氯乙雜脂為 基材之橡皮擦，該基材中除了含有塑化劑及充填劑之外， 另含有無機球狀中空微粒（參照專利文獻^。然而，直到 最近，由於氯乙烯樹脂中含有氯原子，而有例如：在焚燒 橡皮擦或橡皮屑時，會產生有害戴奥辛之憂慮；亦擔心來 自酞酸系塑化劑之環境污染。因此而提案一種橡皮擦，其 ❹係在橡皮擦中調入氫氧化鋁作為充填劑以抑制焚燒時戴奥 辛的產生（參照專利文獻2) ’並使用不含氯之苯乙稀_丁二 烯-苯乙烯共聚物做為基材者（參照專利文獻3)，惟相較於 以亂乙埽樹脂做為基劑之橡皮擦，其消字性能較差。 如此’對於以氯乙婦樹脂做為基劑之橡皮擦，^_直以 來雖有各種改良提案’但只要以氯乙烯樹脂做為基劑，即 無法完全撇開環境污染之問題。 因此’近來提案一種以聚胺醋取代以往之氯乙稀樹脂 作為’基材之橡皮擦（參照專利文獻4 )。然而，由於該橡皮 321263 3 201006690 擦為了形成聚胺酯而使用橡膠系多元醇，故將字消去時， 觸感（亦即，滑度）變差，因此消字性能仍有改善空間。 [先前技術文獻]: [專利文獻1]日本特開平10-193880號公報 [專利文獻2]日本特開2004-188850號公報 [專利文獻3]日本特開平05-147392號公報 [專利文獻4]日本特開2000-025391號公報 【發明内容】 [發明所欲解決之課題] 本發明者等為了解決上述之向來以聚胺酯做為基材 的橡皮擦之問題，經專心一致研究之結果發現：以使選自 蓖麻油與硬化蓖麻油之至少一種多元醇與多異氰酸酯反應 而得之聚胺酯做為基材，並使該基材中含有塑化劑、研磨 劑、充填劑，藉此而改善消字時之觸感（亦即，滑度），同 時成功地提升消字性能，遂而達成本發明。因此，本發明 之目的係提供一種具有消字時之滑順度以及消字性能更加 優異且以聚胺酯做為基材之橡皮擦。 [用以解決課題之手段] 依照本發明即可提供一種橡皮擦，其包含：由選自蓖 麻油與硬化蓖麻油之至少一種多元醇20至50重量％與多異 氰酸酯（polyisocyanate)5至17重量％反應而得之聚胺 酯；塑化劑3至30重量％ ;研磨劑10至40重量％ ;以及充 填劑5至2 0重量％。 依照本發明即可提供一種橡皮擦之製造方法，其係於 4 321263 201006690 '常溫下或依需要於加熱下，使多異氰酸酯5至17重量％溶 解於含有：塑化劑3至30重量％、研磨劑10至40重量°/〇、 ^ 充填劑5至20重量％、以及選自蓖麻油與硬化蓖麻油之至 • 少一種多元醇20至50重量％之混合物中，將所得之混合物 注入模具中，並於加熱下使上述多異氰酸酯與上述多元醇 之反應完成，再將所得之成形物由模具中取出，並裁成所 要求之形狀者。 [發明之效果] ® 依照本發明，即可獲得一種橡皮擦，其係以使選自蓖 麻油與硬化蓖麻油之至少一種多元醇與多異氰酸酯反應而 得交聯密度高之聚胺酯做為基材，使其與塑化劑、研磨劑 與充填劑組合而做成均一之組成物，並將此輕輕地擦拭紙 面上之筆跡（亦即，滑順地輕輕碰觸），即可充分地消去字 跡。 【實施方式】 0 [用以實施發明之最佳型態] 依本發明之橡皮擦係包含：由選自蓖麻油與硬化蓖麻 油之至少一種多元醇20至50重量°/◦與多異氰酸酯5至17 重量％反應而得之聚胺酯；塑化劑3至30重量％ ;研磨劑 10至40重量％ ;以及充填劑5至20重量％。本發明中，將 橡皮擦之製造中所使用的各種成分之比例係規定為以所得 橡皮擦重量為基準之百分率（亦即，重量％)，因此，使用上 述之各種成分而得之橡皮擦為100重量％。 依照本發明，用以獲得作為基材之聚胺酯之多元醇， 5 321263 201006690 係使用選自蓖麻油與硬化蓖麻油之至少一種者。如一般所 皆知者，歡麻油之主要成分（約90%)為三莫麻酸甘油醋， 蓖麻酸係分子中具有羥基與雙鍵之不飽和含氧酸。因此， ‘ 蓖麻油係以三官能多元醇為主要成分，蓖麻油之羥基值通 常在150至170mgKOH/g之範圍。 硬化萬麻油係藥麻油在觸媒的存在下經氳化而得之 融點約為85°C之蠟狀物，相對於蓖麻油，其主要成分為三 (12-羥基硬脂酸）甘油酯。硬化蓖麻油之羥基值通常在150 至170mgKOH/g之範圍。 ❹ 依照本發明，即可得到一種橡皮擦，其係以此種多元 醇與下述之多異氰酸酯反應而得之交聯密度高之聚胺酯做 為基材，並使其含有塑化劑、研磨劑以及充填劑之組合， 藉此而輕輕地擦拭紙面上之筆跡（亦即，滑順地輕輕碰 觸），即可充分地消去字跡。 依照本發明，多元醇之使用量，以橡皮擦之重量為基 準，通常在20至50重量％之範圍。如多元醇之使用量超出 q 上述範圍時，即使以本發明所規定之比例同時使用下述之 塑化劑、研磨劑、充填劑以及多異氰酸酯時，亦無法得到 固化物。 本發明中，多異氰酸酯只要是在常溫下或依需要於加 熱下，溶解於所使用之多元醇與下述塑化劑之混合物中者 即可，可使用脂肪族、脂環族、芳香族以及芳香脂肪族多 異氰酸醋的任一種。 此種多異氰酸酯之具體例可列舉如： 6 321263 201006690 四亞曱基二異氰酸酯、十二亞曱基二異氰酸酯、六亞 曱基二異氰酸酯、2, 2, 4-三甲基六亞甲基二異氰酸酯、 ^ 2, 4, 4-三曱基六亞曱基二異氰酸酯、離胺酸二異氰酸酯、 ， 2-曱基戊烷-1，5-二異氰酸酯、3-曱基戊烷-1, 5-二異氰酸 酯等脂肪族多異氰酸酯； 異佛爾酮二異氰酸酯、氩化苯二曱撐二異氰酸酯、 4, 4’-二環己基曱烷二異氰酸酯、1，4-環己烷二異氰酸酯、 曱基環己撐二異氰酸酯、1，3-雙（異氰酸根曱基）環己烷等 ❿脂環族多異氰酸酯； 曱苯撐二異氰酸酯、二苯曱烷二異氰酸酯、多亞曱基 多苯基多異氰酸酯、聯曱苯胺二異氰酸酯、4, 4’-二苯曱基 二異氰酸酯、1，5-萘撐二異氰酸酯、1，3-苯撐二異氰酸酯、 1，4-苯撐二異氰酸酯等芳香族多異氰酸酯； 苯二曱撐二異氰酸酯、四曱基苯二曱撐二異氰酸酯等 芳香脂肪族多異氰酸酯。 Q 該等之中，適用於本發明之多異氰酸酯之例可列舉 如：曱苯撐二異氰酸酯、二苯基曱烷二異氰酸酯、多亞曱 基多苯基多異氰酸酯、六亞甲基二異氰酸酯、異佛爾酮二 異氰酸酯、四曱基苯二曱基撐二異氰酸酯、氫化苯二甲撐 二異氰酸酯等。然而，本發明中亦以曱苯撐二異氰酸酯、 多亞曱基多苯基多異氰酸酯、六亞曱基二異氰酸酯、異佛 爾酮二異氰酸酯為適用。該等可單獨使用，亦可2種以上 併用。 本發明中，該等多異氰酸酯可預先與上述多元醇反應 7 321263 201006690 作為預聚物使用。 更且，上述多異氰酸酯之加成物或異氰脲酸酯於常溫 下或依需要於加熱下，如為可溶解於所使用之多元醇與下 ‘ 述塑化劑的混合物中者，則於本發明中可與上述之多異氰 酸酉旨一起或單獨地使用作為多異氰酸醋。加成物係例如： 使如三羥曱基丙烷及甘油之三元醇1莫耳份與二異氰酸酯 3莫耳份進行加成反應而得之3官能多異氰酸酯，可列舉 如：曱苯撐二異氰酸酯、六亞曱基二異氰酸酯、異佛爾酮 二異氰酸酯等加成物。 ❹ 另外，異氰脲酸酯係使二異氰酸酯3聚化而得之3官 能多異氰酸酯，同樣地，可列舉如：甲苯撐二異氰酸酯、 六亞甲基二異氰酸酯、異佛爾酮二異氰酸酯等氰脲酸酯。 依照本發明，多異氰酸酯之使用量，以橡皮擦之重量 為基準，通常在5至17重量％之範圍，以5至10重量％之 範圍為佳。如多異氰酸酯之使用量超出上述範圍時，即使 以本發明所規定之比例同時使用下述之塑化劑、研磨劑充 q 填劑以及多元醇，亦無法得到固化物。 因此，依照本發明，橡皮擦以其重量為基準，係具有 以使多異氰酸酯5至17重量％(以5至10重量％為佳）與多 元醇20至50重量％反應而得之聚胺酯做為基材。所使用之 多異氰酸酯與多元醇之量過少或過量時，則經由多異氰酸 酯與多元醇反應所形成之基材對所得橡皮擦之比例變成過 小或過大，即使可得固化物，然而卻無法獲得具有適度彈 性與消字性能之橡皮擦。 8 321263 201006690 * 塑化劑可對所得之橡皮擦賦予適度彈性，除了可在消 字時輕輕地碰觸並隨意操作之外，當擦拭紙面上之筆跡 ^ 時，即會吸附由石墨所成的筆跡，為擔任提高消字性能之 ' 角色。依照本發明，此種塑化劑可使用各類之物。 適用於本發明之塑化劑之例可列舉如： 脂肪族二元酸二烷酯：己二酸二-2-乙基己酯、己二 酸二異壬酯、癸二酸二丁酯、癸二酸二-2-乙基己酯、壬二 酸二-2-乙基己酯等； © 乙醯化檸檬酸三烷酯：乙醯化檸檬酸三乙酯、乙醯化 檸檬酸三丁酯等； 乙醯蓖麻酸烷酯：乙醯蓖麻酸甲酯、乙醯蓖麻酸丁酯 等； 烷基磺酸酯：烷基磺酸苯酯； 苯甲酸二烷二醇酯； 偏苯三酸三烷酯：偏苯三酸三（2-乙基己基）酯； q 環氧化環己烷二羧酸二烷酯：4, 5-環氧基-1，2-環己 烷二羧酸二（2-乙基己基）酯； 有機磷酸酯：磷酸三丁酯、磷酸三（2-乙基己基）酯、 磷酸三苯酯、磷酸三甲苯酯等。 該等塑化劑可單獨使用，亦可將2種以上組合使用。 此種塑化劑之使用量，以橡皮擦重量為基準，通常在 3至30重量％之範圍，以10至30重量％之範圍為佳。橡皮 擦中之塑化劑比例少於3重量％時，所得之橡皮擦變硬，擦 字時之觸感差且消字性能低。反之，橡皮擦中之塑化劑比 9 321263 201006690 例多於30重量％時，所得之橡皮擦過軟而無法隨意操作。 研磨劑係當擦拭紙面上之筆跡進行消字時，除了刮去 紙面與筆H助料之外’並促進_橡皮擦表面使之 脫落’而產生橡皮屑之作用，如此而擔任著防止石墨等厂 垢吸附在紙面上的角色。 、 此種研磨劑，其例可列舉如：碳酸約、滑石、黏土 雲母、氫氧化链、氫氧化妈、氫氧化鎂、硫酸角、氧化辞、 氧化鋁、氧化鈦、無水矽酸、玻璃鱗片以及氧化矽等。 本發明中，研磨劑之使用量，以橡皮擦為基準，通常 在10至40重量％之範圍。橡皮擦中之研磨劑比例少於 重量％時，所得之橡皮擦無法持有充分的消字性能。反之， 橡皮擦中之研磨劑比例多於40重量％時，在消字時，不僅 過度地磨傷紙面並減低消字性能。而且，橡皮屑不易收集。 本發明中，充填劑係以球狀中空微粒為適用。已头=球 狀中空微粒中含有無機球狀中空微粒以及有機球狀中空微 粒’該等可單獨或組合使用。 有機球狀中空微粒之具體例可列舉如：苯酚球、偏二 氣乙烯球等。該等有機球狀中空微粒例如：具有由聚偏二 氯乙烯-丙烯腈共聚物、丙烯腈-丙烯酸酯共聚物、聚乙埽、 聚丙稀、苯乙烯〜丙烯酸酯共聚物等之樹脂所構成之外壁且 平均粒徑約為50 之球狀中空微粒。 無機球狀中空微粒以玻璃球、西拉斯球（Shirasu Balloon)、氧化矽球等為適用。此種無機球狀中空微粒通 常為數βιη至數十左右的中空球體。 10 321263 201006690 依照本發明，球狀中空微粒番 基準，係在5至2〇重量％之箱 量，如以橡皮擦為 紙面與橡皮擦之_摩捧 ^此而於財時，減低 字髮擦中之無機球二:==7消 無法獲得上述效果。反之，橡 5重量斗即 比例多於20重量%時，杏 之…、機球狀中空微粒 皮擦易於折裂之缺點Λ ’在擦拭筆跡之際，有橡 本發明中，如上所述，當消 擦間的摩擦阻力之效果優異而言，特;面與橡皮 粒為適用。 、別以無機球狀中空微 依照本發明之橡皮擦’在該製造 定者，惟財之較佳者係在容器中，^無特別限 之塑含有:分別為上述規定量 之塑化劑、研磨劑、充填劑以及多元醇之混合物中，將所 仔之混合物注入模具中’並於加熱下使上述多異氰酸醋與 ❹ 上述多兀醇之反應完成，再將所得之成形物由模具中取 出’並裁成所要求之形狀即可獲得。 更詳而言之，例如：在適當的反應容器内饋入上述規 疋量之塑化劑、研磨劑、充填劑以及多元醇，於常溫下或 依而要而在50至100»c之加熱下攪拌使成為均勻的混合物 後，加熱至50至lOOt：。待該混合物之溫度穩定後，於其 中添加上述規定量之多異氰酸酯，進行授拌分鐘至1 小時左右。然後，將如此操作所獲得之混合物進行脫氣後 ;主入模具中，並於110至150t：(以115至i3(rc為值）之供 11 321263 201006690 箱中加熱30分鐘至3小時（並無硬性規定），使上述多異氰 ~ 酸酯與上述多元醇之反應完成。將如此操作而得之成形物 由模具中取出，裁成所要求之形狀而得到依本發明之橡皮 ' 擦。 . 於多異氰酸酯與多元醇之反應時，為了促進該反應， 可依需要而使用例如：三乙二胺、Ν, Ν’ -二曱基六亞甲基二 胺、Ν，Ν’ -二曱基丁二胺等三級胺類、辛酸鉛、二月桂酸二 丁基錫等有機金屬化合物等，以及以往習知之聚胺酯化觸 媒。 〇 依本發明之橡皮擦中，可依需要而再含有著色劑、阻 燃劑等添加劑，並且為了使所得橡皮擦之耐久性與安定性 提高，可適當地含有熱安定劑、抗氧化劑、紫外線吸收劑 等。 [實施例] 以下係舉實施例而說明本發明。然而本發明並不受該 等實施例所限制。 ◎ 實施例1至22以及比較例1至9 (橡皮擦之製造） 依據上述方法，使用表1至3所示之原料，製造各個 橡皮擦。表1至3中，各原料之量為重量份。並且，表1 至3所示之各原料係如下所述。 •蓖麻油：豐國製油（股）製造之工業用1號蓖麻油（經中和 滴定法測定之羥基值161mgK0H/g) •硬化蓖麻油：伊藤製油（股）製造之硬化蓖麻油（經中和 12 321263 201006690 滴定法測定之羥基值16〇mgKOH/g) •塑化劑1 :大八化學工業（股）製造之璘酸三甲苯酯 •塑化劑2:新日本理化（股）製造之Sansocizer(己二酸二 ’ 異壬酯） •塑化劑3 :旭化成Finechem(股）製造之乙酿化檸1樣酸三 丁酯 •塑化劑4 : Lanxess(股）製造之烷基碳原子數10至21之 烷基磺酸苯酯「Mesamoll II」 β •塑化劑5 : DIC(股）製造之4, 5-環氧基-1，2-環己烷羧酸 雙（2-乙基己基）酯「Monocizer W-150」 •塑化劑6:DIC(股）製造之苯甲酸二烷二醇酯「Monocizer PB-3A」 •塑化劑7 : DIC(股）製造之偏苯三酸三（2-乙基己基）酯 「Monocizer W-705」 •塑化劑8:伊藤製油（股）製造之乙酿蓖麻酸甲酯 ^ 「RIC-CIZER C-101」 •塑化劑9 :伊藤製油（股）製造之乙酿莫麻酸丁醋 「RIC-CIZER 0401」 •研磨劑：丸釜釜戶陶料（股）製造之雪印氧化矽特級4號 •充填劑：富士西里石夕亞化學（叫以Silysia Chemical)(股) 製造之富士氣球S-35(玻璃球） •著色劑：堺化學工業（股）製造之氧化鈦「R_25」 •多異氰酸酯1 :日本聚胺酯工業（股）製造之2’4—曱苯一 異氰酸酯80%與2, 6-曱苯二異乳酸酯20%之混合物 321263 · 13 201006690 「Colonate Τ-80」 •多異氰酸酯2:日本聚胺酯工業（股）製造之多亞曱基多 苯基多異氰酸酯「Mirionate MR-100」 •多異氰酸酯3 :住化拜耳聚胺酯（股）製造之曱苯二異氮 酸酯加成物「SumidurL-75」（固形分濃度乃％之乙酸乙醋 溶液） •多異氰酸酯4 :日本聚胺酯工業（股）製造之六亞甲基二 異氰酸酯三聚物（異氰脲酸酯）「Colonate HX」 •多異氰酸酯5 :日本聚胺酯工業（股）製造之六亞曱基二 異氰酸酯「HDI」 •多異氰酸酯6 :住化拜耳聚胺酯（股）製造之異佛爾嗣二 異氰酸醋「Desmodur I」 反應物之成形性： 於橡皮擦之製造中，研究經由多元醇與多異氣酸醋之 反應所得反應物之成形性。可獲得作為固化物之反應物’ 以該固化物具有橡皮擦機能時為A;以反應物雖勉強形成 固體卻過於柔軟而不具有橡皮擦機能時為B;以所得反應 物無法形成固體而具有流動性時為C。 橡皮擦之性能評估： 以鉛筆在稿紙上做筆記，將該筆跡以各橡皮擦進行擦 拭’分別對此等檢測消字性能與消字時的觸感。 (消字性能） 可將字跡完全擦除時為A;必須強力地擦拭才可榛除 字跡時為B;即使多次反覆地擦拭亦無法擦除時為C。 201006690 (消字時的觸感） 藉由輕輕地擦拭（亦即，輕輕地碰觸）即可將字跡完全 擦除時為A ;須稍微加強碰觸（擦拭）才可將字跡擦除時為 ' B;需以強力碰觸（擦拭）才能擦除字跡而卻使紙面變形時為 Ο 將上述結果於表1、表2以及表3中表示。 〇 15 321263 201006690 表 uAt the time of the trace, the surface of the eraser is liable to adhere to the problem of the graphite staining the paper surface. '' Therefore, in recent years, it has been widely used as an eraser based on soft chloroethylene glycol, which contains inorganic spherical hollow particles in addition to plasticizers and fillers (see patent Document ^. However, until recently, due to the chlorine atom contained in the vinyl chloride resin, for example, when burning an eraser or rubber swarf, there is a concern that harmful dioxin is generated; and environmental pollution from a phthalic acid plasticizer is also feared. Therefore, an eraser is proposed in which an aluminum hydroxide is added as a filler in an eraser to suppress the generation of dioxin during incineration (refer to Patent Document 2) 'and a benzene-free butadiene-free-containing chlorine- A styrene copolymer is used as a substrate (refer to Patent Document 3), but its eraser performance is inferior to that of an eraser based on a chaotic acetamidine resin. The eraser of the agent, although there are various improvements in the proposal, but as long as the vinyl chloride resin is used as the base, the problem of environmental pollution cannot be completely removed. Therefore, a proposal has recently been made to replace the former chlorine with polyurethane. A thin resin is used as a 'substrate eraser (refer to Patent Document 4). However, since the rubber 321263 3 201006690 rubs a rubber-based polyol for forming a polyurethane, the touch (ie, slip) when the word is erased is used. In the case of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity of the singularity. [Problem to be Solved by the Invention] The inventors of the present invention have solved the above-described eraser using polyurethane as a substrate. The problem, as a result of intensive research, found that a polyurethane obtained by reacting at least one polyol selected from castor oil and hardened castor oil with a polyisocyanate is used as a substrate, and the substrate contains a plasticizer, An abrasive and a filler are used to improve the tactile sensation (i.e., slip) at the time of erasing while successfully improving the character of the character erasing, thereby achieving the present invention. Therefore, the object of the present invention is to provide a An eraser having a smoothness in erasing and a more excellent erasing performance and using polyurethane as a base material. [Means for Solving the Problem] According to the present invention, an eraser comprising: selected from the group consisting of 蓖a polyurethane obtained by reacting 20 to 50% by weight of at least one polyol of sesame oil and hardened castor oil with 5 to 17% by weight of polyisocyanate; 3 to 30% by weight of a plasticizer; 10 to 40% by weight of an abrasive; Filling agent 5 to 20% by weight. According to the present invention, a method for producing an eraser can be provided, which is prepared by dissolving 5 to 17% by weight of polyisocyanate at room temperature or under heating at room temperature or as needed: 3 to 30% by weight of the plasticizer, 10 to 40% by weight of the abrasive, 5 to 20% by weight of the filler, and 20 to 50% by weight of the polyol selected from the castor oil and the hardened castor oil. In the mixture, the resulting mixture is poured into a mold, and the reaction of the above polyisocyanate with the above polyol is completed under heating, and the obtained formed product is taken out from the mold and cut into a desired shape. [Effects of the Invention] ® According to the present invention, an eraser can be obtained which is obtained by reacting at least one polyol selected from castor oil and hardened castor oil with a polyisocyanate to obtain a polyurethane having a high crosslinking density as a substrate. Make it a uniform composition by combining it with a plasticizer, an abrasive and a filler, and gently wipe the handwriting on the paper surface (that is, gently touch it gently). Eliminate the writing. [Embodiment] 0 [Best Mode for Carrying Out the Invention] The eraser according to the present invention comprises: 20 to 50 wt%/◦ and polyisocyanate 5 from at least one polyol selected from the group consisting of castor oil and hardened castor oil. The polyurethane obtained by reacting to 17% by weight; the plasticizer 3 to 30% by weight; the abrasive 10 to 40% by weight; and the filler 5 to 20% by weight. In the present invention, the ratio of the various components used in the manufacture of the eraser is defined as the percentage based on the weight of the obtained eraser (that is, the weight %), and therefore, the eraser obtained by using the above various components is 100% by weight. According to the present invention, a polyol for obtaining a polyurethane as a substrate is used, and 5 321263 201006690 uses at least one selected from the group consisting of castor oil and hardened castor oil. As is generally known, the main component of sesame oil (about 90%) is glycerol trimethoate, which is an unsaturated oxo acid having a hydroxyl group and a double bond in a ricinoleic molecule. Therefore, ‘castor oil is mainly composed of a trifunctional polyol, and the hydroxyl value of castor oil is usually in the range of 150 to 170 mgKOH/g. The hardened cannabis oil is obtained by deuteration in the presence of a catalyst to obtain a wax having a melting point of about 85 ° C. Compared with castor oil, the main component is tris(12-hydroxystearic acid) glyceride. . The hardened castor oil typically has a hydroxyl number in the range of from 150 to 170 mg KOH/g.依照 According to the present invention, an eraser obtained by reacting such a polyol with a polyisocyanate described below to obtain a polyurethane having a high crosslinking density as a substrate and containing a plasticizer or an abrasive And a combination of fillers, whereby the handwriting on the paper surface is gently wiped (ie, smoothly touched smoothly), and the writing can be sufficiently eliminated. According to the present invention, the amount of the polyol used is based on the weight of the eraser, and is usually in the range of 20 to 50% by weight. When the amount of the polyol used exceeds the above range, the cured product cannot be obtained even when the following plasticizer, abrasive, filler, and polyisocyanate are simultaneously used in the ratio specified in the present invention. In the present invention, the polyisocyanate may be dissolved in a mixture of the polyol to be used and a plasticizer to be used at ordinary temperature or under heating as needed, and aliphatic, alicyclic, aromatic, and the like may be used. Any of aromatic aromatic polyisocyanuric vinegars. Specific examples of such a polyisocyanate include, for example, 6 321263 201006690 tetradecyl diisocyanate, dodecylphosphonium diisocyanate, hexamethylene diisocyanate, 2, 2, 4-trimethylhexamethylene di Isocyanate, ^ 2, 4, 4-tridecylhexamethylene diisocyanate, diazonic acid diisocyanate, 2-nonylpentane-1,5-diisocyanate, 3-decylpentane-1, 5 - an aliphatic polyisocyanate such as a diisocyanate; isophorone diisocyanate, arsonyl diisocyanate, 4,4'-dicyclohexyldecane diisocyanate, 1,4-cyclohexane diisocyanate, fluorenyl group a cycloaliphatic polyisocyanate such as cyclohexamethylene diisocyanate or 1,3-bis(isocyanatoinyl)cyclohexane; terpene diisocyanate, diphenylnonane diisocyanate, polydecylene polyphenylene Aromatic polyisocyanate, benzidine diisocyanate, 4,4'-diphenylguanidinium diisocyanate, 1,5-naphthyl diisocyanate, 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate Isocyanate; benzodiazepine diisocyanate, tetradecylbenzenediene diisocyanate Ester and other aromatic aliphatic polyisocyanates. Among these, examples of the polyisocyanate to be used in the present invention include, for example, anthraquinone diisocyanate, diphenyldecane diisocyanate, polyarylene polyphenyl polyisocyanate, hexamethylene diisocyanate, Isophorone diisocyanate, tetradecyl benzodiazepine diisocyanate, hydrogenated xylylene diisocyanate, and the like. However, in the present invention, anthraquinone diisocyanate, polydecylene polyphenyl polyisocyanate, hexamethylene diisocyanate, or isophorone diisocyanate is also suitable. These may be used alone or in combination of two or more. In the present invention, the polyisocyanates may be previously used as a prepolymer by reacting with the above polyols 7 321263 201006690. Furthermore, the adduct or isocyanurate of the above polyisocyanate is heated at room temperature or as needed, such as in a mixture of the polyol used and the plasticizer described below. In the present invention, it may be used together with the above polyisocyanate as a polyisocyanate. The adduct is, for example, a trifunctional polyisocyanate obtained by subjecting a molar portion of a triol of trishydroxylpropane and glycerin to a molar amount of 3 parts of a diisocyanate, and examples thereof include anthraquinone An adduct such as isocyanate, hexamethylene diisocyanate or isophorone diisocyanate. Further, the isocyanurate is a trifunctional polyisocyanate obtained by polymerizing a diisocyanate 3, and similarly, a cyanide such as tolylene diisocyanate, hexamethylene diisocyanate or isophorone diisocyanate may be mentioned. Urea ester. The polyisocyanate is used in an amount of from 5 to 17% by weight, preferably from 5 to 10% by weight, based on the weight of the eraser, in accordance with the present invention. When the amount of the polyisocyanate used is outside the above range, the cured product cannot be obtained even if the following plasticizer, abrasive charge filler, and polyol are simultaneously used in the ratio specified in the present invention. Therefore, according to the present invention, the eraser has, based on its weight, a polyurethane which is obtained by reacting 5 to 17% by weight of the polyisocyanate (preferably 5 to 10% by weight) with 20 to 50% by weight of the polyol. Substrate. When the amount of the polyisocyanate and the polyhydric alcohol used is too small or excessive, the ratio of the base material formed by reacting the polyisocyanate with the polyhydric alcohol to the obtained eraser becomes too small or too large, and even if a cured product is obtained, it cannot be obtained. Eraser with moderate elasticity and erasing performance. 8 321263 201006690 * The plasticizer imparts moderate elasticity to the resulting eraser. In addition to being gently touched and manipulated during the eradication, when the handwriting on the paper is wiped, it is adsorbed by graphite. The handwriting is for the role of improving the performance of the word. According to the present invention, such a plasticizer can be used in various types. Examples of the plasticizer to be used in the present invention include, for example, an aliphatic dibasic acid dialkyl ester: di-2-ethylhexyl adipate, diisononyl adipate, dibutyl sebacate, Di-2-ethylhexyl sebacate, di-2-ethylhexyl sebacate, etc.; © triethyl citrate: acetonitrile triethyl citrate, acetonitrile citrate Butyl ester and the like; alkyl ricinoleate: methyl ricinoleate, butyl ricinoleate, etc.; alkyl sulfonate: phenyl sulfonate; dialkyl glycol benzoate; Trialkyl trimellitate: tris(2-ethylhexyl) trimellitate; q Dialkyl cyclohexane hexane dicarboxylate: 4, 5-epoxy-1,2-cyclohexane Di(2-ethylhexyl) dicarboxylate; organic phosphate: tributyl phosphate, tris(2-ethylhexyl) phosphate, triphenyl phosphate, tricresyl phosphate, and the like. These plasticizers may be used singly or in combination of two or more. The amount of such a plasticizer to be used is usually in the range of 3 to 30% by weight, preferably 10 to 30% by weight based on the weight of the eraser. When the proportion of the plasticizer in the eraser is less than 3% by weight, the resulting eraser becomes hard, and the touch feeling during the erasing is poor and the erasing performance is low. On the other hand, when the plasticizer in the eraser is more than 30% by weight than the 9321263 201006690 case, the resulting eraser is too soft to be freely operated. When the handwriting on the wiping paper is erased, the abrasive is used to prevent graphite and the like, in addition to scraping off the paper surface and the pen H, and promoting the _ eraser surface to fall off. The role of scale on the paper. Examples of such an abrasive include carbonic acid, talc, clay mica, hydrogen hydroxide chain, hydroxide mother, magnesium hydroxide, sulfuric acid angle, oxidation, alumina, titanium oxide, anhydrous citric acid, and glass flakes. And bismuth oxide and the like. In the present invention, the amount of the abrasive used is usually in the range of 10 to 40% by weight based on the eraser. When the proportion of the abrasive in the eraser is less than % by weight, the resulting eraser cannot hold sufficient erasing properties. On the other hand, when the proportion of the abrasive in the eraser is more than 40% by weight, not only the paper surface is excessively worn and the character of the eraser is reduced at the time of erasing. Moreover, the rubber shavings are not easy to collect. In the present invention, the filler is applied to spherical hollow fine particles. The head = spherical hollow fine particles contain inorganic spherical hollow fine particles and organic spherical hollow fine particles ' These may be used singly or in combination. Specific examples of the organic spherical hollow fine particles include phenol balls and vinylidene dioxide balls. The organic spherical hollow fine particles are, for example, composed of a resin such as a polyvinylidene chloride-acrylonitrile copolymer, an acrylonitrile-acrylate copolymer, a polyethylene hydride, a polypropylene, a styrene-acrylate copolymer, or the like. A spherical hollow particle having an outer wall and an average particle diameter of about 50. The inorganic spherical hollow fine particles are suitable for use as a glass ball, a Shirasu balloon, a cerium oxide ball or the like. Such inorganic spherical hollow fine particles are usually hollow spheres having a number of β? to several tens of. 10 321263 201006690 According to the present invention, the spherical hollow microparticles are based on the amount of 5 to 2% by weight of the box, such as the eraser as the paper surface and the eraser, and the profit is reduced. Inorganic ball 2: ==7 can not achieve the above effect. On the other hand, when the ratio of the weight of the rubber 5 is more than 20% by weight, the apricot... the shortness of the spherical hollow particle is easy to be broken. Λ 'When wiping the handwriting, there is a rubber in the invention, as described above, when The effect of the frictional resistance between the rubbing is excellent, and the surface and the rubber granule are suitable. In the case of the inorganic spheroidal hollow micro-adhesive according to the present invention, the preferred one is in the container, and the plastic is not particularly limited: the plasticizer of the above specified amount, In the mixture of the abrasive, the filler and the polyol, the mixture is injected into the mold and the reaction of the above polyisocyanate with the above-mentioned polyterpene alcohol is completed under heating, and the obtained formed product is molded by the mold. It can be obtained by taking it out and cutting it into the required shape. More specifically, for example, feeding the above-mentioned amount of plasticizer, abrasive, filler and polyol in a suitable reaction vessel, heating at room temperature or according to 50 to 100»c After stirring to make a homogeneous mixture, it is heated to 50 to 100 t:. After the temperature of the mixture is stabilized, the above-mentioned predetermined amount of polyisocyanate is added thereto, and the mixing is carried out for about 1 hour. Then, after the mixture obtained in this way is degassed; it is mainly introduced into the mold and heated at 110 to 150 t: (for 115 to i3 (rc value) for 11 minutes to 3,060,060,090 boxes for 30 minutes to 3 hours (and The hardening of the above polyisocyanate is carried out by reacting the above polyisocyanate with the above polyol. The molded article thus obtained is taken out from the mold and cut into a desired shape to obtain an eraser according to the present invention. In the reaction of a polyisocyanate with a polyhydric alcohol, in order to promote the reaction, for example, triethylenediamine, hydrazine, Ν'-dimercaptohexamethylenediamine, hydrazine, Ν'-difluorene may be used as needed. An organometallic compound such as a tertiary amine such as a butyl amide, a lead octoate or a dibutyltin dilaurate; and a conventionally used polyurethane-catalyzed catalyst. In the eraser of the present invention, a coloring agent may be further contained as needed. Additives such as a flame retardant, and in order to improve the durability and stability of the obtained eraser, a heat stabilizer, an antioxidant, an ultraviolet absorber, etc. may be appropriately contained. [Examples] Hereinafter, the present invention will be described by way of examples. .however The present invention is not limited by the examples. ◎ Examples 1 to 22 and Comparative Examples 1 to 9 (Manufacturing of Eraser) According to the above method, each of the erasers was produced using the raw materials shown in Tables 1 to 3. In each of 1 to 3, the amount of each raw material is part by weight, and each of the raw materials shown in Tables 1 to 3 is as follows: • Castor oil: Industrial No. 1 castor oil manufactured by Fengguo Oil Co., Ltd. Hydroxyl value determined by titration method 161mgK0H/g) • Hardened castor oil: Hardened castor oil made from Ito Oil (stock) (hydroxyl value determined by titration method 12 321263 201006690 titration 16〇mgKOH/g) • Plasticizer 1 : tricresyl citrate manufactured by Da Ba Chemical Industry Co., Ltd. • Plasticizer 2: Sansocizer (di-isodecyl adipate) manufactured by Nippon Chemical and Chemical Co., Ltd. • Plasticizer 3: Asahi Kasei Finechem Manufactured by B. sulphate 1 - acid butyl acrylate plasticizer 4 : Benzene alkyl sulfonate having a C 10 to 21 alkyl group produced by Lanxess Co., Ltd. "Mesamoll II" β • Plasticizer 5 : 4, 5-epoxy-1,2-cyclohexanecarboxylic acid bis(2-ethylhexyl)ester manufactured by DIC Co., Ltd. "Monocizer W-150" • Plasticizer 6: Dioctanyl benzoate manufactured by DIC (Mono) PB-3A • Plasticizer 7: Triammonic acid tris (2-B) manufactured by DIC "Monocizer W-705" • Plasticizer 8: Ethyl ricinoleate manufactured by Ito Oil Co., Ltd. ^ "RIC-CIZER C-101" • Plasticizer 9: Ito Oil Co., Ltd. Manufactured by RIC-CIZER 0401, a sulphuric acid, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar, vinegar Chemical) Co., Ltd. Fuji Balloon S-35 (glass ball) • Colorant: Titanium oxide “R_25” manufactured by 堺Chemical Industry Co., Ltd. • Polyisocyanate 1: 2'4 manufactured by Japan Polyurethane Industry Co., Ltd. Mixture of terpene monoisocyanate 80% and 2,6-nonyldiisolactate 20% 321263 · 13 201006690 "Colonate Τ-80" • Polyisocyanate 2: Polyurethane based in Japan Polyurethane Industry Co., Ltd. Phenyl polyisocyanate "Mirionate MR-100" • Polyisocyanate 3: phthalic acid produced by Bayer Polyurethane Co., Ltd. Ester adduct "Sumidur L-75" (solid content concentration is ethyl acetate solution) • Polyisocyanate 4: hexamethylene diisocyanate trimer (isocyanurate) manufactured by Japan Polyurethane Industry Co., Ltd. "Colonate HX" • Polyisocyanate 5: Hexamethylene diisocyanate "HDI" manufactured by Japan Polyurethane Industry Co., Ltd. • Polyisocyanate 6: Isophoric diisocyanate made from Bayer Polyurethane Co., Ltd. Desmodur I" Formability of the reactant: In the manufacture of the eraser, the formability of the reactant obtained by the reaction of the polyol with the polyisoanic acid vinegar was investigated. A reactant which can be obtained as a cured product, which is A when the cured product has an eraser function; B when the reactant is too strong to form a solid but is too soft without an eraser function; and the obtained reactant cannot form a solid and has When the liquidity is C. Evaluation of the performance of the eraser: Take a pencil on the manuscript paper and wipe the handwriting with each eraser to detect the tactile performance and the tactile sensation when erasing. (Attenuation performance) It can be A when the writing is completely erased; it must be B if it is strongly wiped out; it is B when it is erased repeatedly. 201006690 (Tactile sensation when erasing) A can be erased by wiping gently (ie, gently touching); A must be slightly touched (wiped) to erase the writing The time is 'B; it is necessary to strongly touch (wipe) to erase the writing but to deform the paper surface. The above results are shown in Table 1, Table 2 and Table 3. 〇 15 321263 201006690 Table u
OS 00^ osz V Voil 0^-o-sl οι 0-9 οσοε ΟΟΌΖ V V 00.00- OS.二ο-ζε 0-6 OS寸 00_s νν 01 ο寸.So-sl οε·9 οσοε ΟΟΌΖ V V 00.00- 0-u 03ε όσιε00.0- oo-lOS 00^ osz V Voil 0^-o-sl οι 0-9 οσοε ΟΟΌΖ VV 00.00- OS. 二ο-ζε 0-6 OS inch 00_s νν 01 οinch.So-sl οε·9 οσοε ΟΟΌΖ VV 00.00- 0 -u 03ε όσιε00.0- oo-l
ννoi OSos.ll OSS 00. ιε 0-8 §-Ννoi OSos.ll OSS 00. ιε 0-8 §-
V V o-st 00 0-u OSS 09·8 όσιε 8·8ι V V szol 0·0 08· U o-s 寸·- όσιε §81 V 9 寸-an § §11 ο·ζε §,ζζ όσιε 00.®- νa I 0-0 0-二 o-s -•6 όσιε 0§ιVV o-st 00 0-u OSS 09·8 όσιε 8·8ι VV szol 0·0 08· U os inch·- όσιε §81 V 9 inch-an § §11 ο·ζε §,ζζ όσιε 00.®- Νa I 0-0 0-two os -•6 όσιε 0§ι
νν zsm 0卜0 0-u OSS 00·9 ο°·ιε §81Νν zsm 0卜0 0-u OSS 00·9 ο°·ιε §81
νν 01 0·0 0-U 0-S 越趄扑锒 蘅嗨" 6冢-斟 8蘅-轵 卜蘅-劄 9蘅-轵 S 一衡-斟 寸茶-斜 w SS L SS 谀礎铖-每 9 避嬸緘畹冷 S 寸ε 谐毽缄畹岭 Ζ 溫毽誡畹呤 I- isirwtf 16 321263 201006690 •表2 e CN拥 J /Λ. 00.9 00·« V 01 0 卜ο 51 osCNico 00.«-Νν 0 0 0 0 0 0 0 0 0 0铖 - every 9 婶缄畹 婶缄畹 S ε ε 毽缄畹 毽缄畹 Ζ Ζ Ζ - - I- isirwtf 16 321263 201006690 • Table 2 e CN J J / Λ. 00.9 00·« V 01 0 卜 ο osCNico 00. «-
V V 00.9 02ε V 00.00-ο卜 Ό owu 09S oooolV V 00.9 02ε V 00.00-ο卜 Ό owu 09S ooool
V VV V
0CNI 00·9 όσιε 00,81 V 00.00-0卜Ό 08·二 09οάε0CNI 00·9 όσιε 00,81 V 00.00-0 Divination 08·2 09οάε
V V 61 00.® οοτ-'ε 090 ο寸·寸一 V 00001 0Γ0 08.= oscgcsV V 61 00.® οοτ-'ε 090 ο inch·inch one V 00001 0Γ0 08.= oscgcs
V V 81 a 91 叫V V 81 a 91
SI 90_卜 !ϊ<οε ειοε V 00.00-I 88Ϊ2 寸 ζοοε V < 卜9·9 5·寸ε 6800 V 00.00- oorou-ει 5εSI 90_卜 !ϊ<οε ειοε V 00.00-I 88Ϊ2 inch ζοοε V < Bu 9·9 5·inch ε 6800 V 00.00- oorou-ει 5ε
V V 00.® 05ε oocol V -01οζ-ο 08-U OQevicoV V 00.® 05ε oocol V -01οζ-ο 08-U OQevico
< V 00.9 οο·ιε 00.81 V ο— S0 08, U οιο<Νε< V 00.9 οο·ιε 00.81 V ο— S0 08, U οιο<Νε
V V 00.9 02ε §001V V 00.9 02ε §001
V 00.00-i oco,u OSCSICOV 00.00-i oco, u OSCSICO
V V ❹ ει 00·9 05ε 00.»-V V ❹ ει 00·9 05ε 00.»-
V00.00- oro 08. U 09SV00.00- oro 08. U 09S
V V CJl 00.9 00. ιε ooodl V oil 05 08_u 09·ζεV V CJl 00.9 00. ιε ooodl V oil 05 08_u 09·ζε
V V 蘅姊铖 ¾趣t ® ss w ss n ss ω si Inf#^斟 寸蘅占劄 colc^sl CVIliqi l- ss ¥i滅 9 避毽緘wic呤 9 锂癍‘砵冷 寸避毽祐蛛呤 ε CNI Τ-避溆祐蛛呤 17 321263 201006690 表3 0 ε術 0·ε §91 0 0 0— 08Ό 00.SI οε，ι 寸 ζει 08- a ο 01 §·0 ®ε>ι °iVV 蘅姊铖3⁄4 fun t ® ss w ss n ss ω si Inf#^斟寸蘅占扎colc^sl CVIliqi l- ss ¥i灭9 毽缄 毽缄wic呤9 Lithium 癍 '砵冷寸毽毽呤ε CNI Τ-溆溆溆呤呤17 321263 201006690 Table 3 0 ε术0·ε §91 0 0 0—08Ό 00.SI οε,ι inchζει 08- a ο 01 §·0®ε>ι °i
S.S οε.9 οε·9 0Κ6 09-ζι ε-s 00s 05ε as 0009S.S οε.9 οε·9 0Κ6 09-ζι ε-s 00s 05ε as 0009
0SZ 0SI 卜 9*ιε0SZ 0SI 卜 9*ιε
ο ν 00.00- SO ε8·6 SOKZ 00- 00_s ΟΟΌΖ 8·Βι ν ο —^— ο— οο-ε ο·" ors ο ω ο— m ο J— 01 0-91ο ν 00.00- SO ε8·6 SOKZ 00- 00_s ΟΟΌΖ 8·Βι ν ο —^— ο— οο-ε ο·" ors ο ω ο— m ο J— 01 0-91
ω ο 00.00- S.I ο οζ,60ι 0·0 08-U ο·ζε ο {}ε·卜 tn 0·0 蘅β砌 ο-ιι 05ε ί# 饑" ® SS ω $0 卜蘅-鹚 9蘅-轵 si#-钿 寸蘅-剷 ^ SS 02 二 w SS L 蘅-斟 0·6ε I^i 滅 9 避嬸 s 谐激祐蜱呤 寸避铋n畹冷 08.寸一 ε 避裏畹呤 Ζ 避嬸祐畹♦ L 避1TW蛾呤 依照本發明之橡皮擦，不僅消字性能優異，經由輕輕 地碰觸而擦拭筆跡即可消字。惟在實施例3中，由於多異 氰酸酯係使用曱苯二異氰酸酯加成物，因此所得橡皮擦比 實施例1中所得橡皮擦稍有硬度；而在實施例4中，由於 18 321263 201006690 ’多異氰酸酯係使用六亞甲基二異氰酸酯三聚物（異脲酸 酯），因此所得橡皮擦比實施例5中所得橡皮擦稍硬；而可 '由此看出實施例3、4在消字性能方面稍差。 ' 相對於此，比較例1之橡皮擦因多異氰脲酸酯之使用 量過少而無法得到固化物。反之，在比較例2方面，因多 異氰酸酯之使用量過多而無法得到固化物。 在比較例3方面，因多元醇之使用量過多而使研磨劑 與充填劑之比例過少，雖可得到固化物，然該固化物幾乎 _ 不具消字性能。比較例4之橡皮擦因不含研磨劑而使消字 性能低劣。比較例5之橡皮擦因不含充填劑而須較強力地 擦拭才可將字跡擦除。比較例6之橡皮擦因充填劑比例過 高，而須強力地擦拭到使紙面變形的程度才可將字跡擦 除，因此觸感差。 比較例7之橡皮擦因塑化劑量太多而過於柔軟，因此 隨意操作性差。比較例8因不含塑化劑，因此在消字時之 φ 觸感不良。比較例9因所使用之多異氰酸酯與多元醇之量 均過少，雖可勉強得到固化物，卻因過於柔軟而不具橡皮 擦所應有之功能。 【圖式簡單說明】無 【主要元件符號說明】無 19 321263ω ο 00.00- SI ο οζ,60ι 0·0 08-U ο·ζε ο {}ε·卜tn 0·0 蘅β ο- ι 05 ε 砌 ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® ® -轵si#-钿寸蘅-shovel ^ SS 02 二w SS L 蘅-斟0·6ε I^i 灭9 婶 婶 谐 蜱呤 蜱呤 蜱呤 蜱呤 蜱呤 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08婶 婶 婶 畹 ♦ L Avoid 1TW moth The eraser according to the present invention not only has excellent character erasing ability, but also wipes the handwriting by gently touching it to eliminate the word. However, in Example 3, since the polyisocyanate was used as the indoene diisocyanate adduct, the resulting eraser was slightly harder than the eraser obtained in Example 1; and in Example 4, since 18 321263 201006690 'polyisocyanate The hexamethylene diisocyanate trimer (isourate) was used, so that the resulting eraser was slightly harder than the eraser obtained in Example 5; however, it can be seen that Examples 3 and 4 are in terms of eraser performance. Slightly worse. On the other hand, the eraser of Comparative Example 1 was too small to obtain a cured product because the amount of polyisocyanurate used was too small. On the other hand, in Comparative Example 2, since the amount of the polyisocyanate used was too large, a cured product could not be obtained. In the case of Comparative Example 3, since the ratio of the abrasive to the filler was too small due to the excessive use of the polyol, a cured product was obtained, and the cured product had almost no hyphenation performance. The eraser of Comparative Example 4 was inferior in erasing performance because it did not contain an abrasive. The eraser of Comparative Example 5 had to be wiped with a stronger force because it did not contain a filler, and the writing was erased. The eraser of Comparative Example 6 was too high in the proportion of the filler, and it was necessary to strongly wipe the degree of deformation of the paper surface to erase the writing, so that the touch was poor. The eraser of Comparative Example 7 was too soft due to too much plasticizing amount, and thus was inconvenient in handling. In Comparative Example 8, since the plasticizer was not contained, the φ touch was poor at the time of erasing. In Comparative Example 9, since the amount of the polyisocyanate and the polyol to be used was too small, the cured product was barely obtained, but it was too soft and had no function as an eraser. [Simple diagram description] None [Main component symbol description] None 19 321263
Claims (1)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008136835A JP5205123B2 (en) | 2008-05-26 | 2008-05-26 | eraser |
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| TW201006690A true TW201006690A (en) | 2010-02-16 |
| TWI500529B TWI500529B (en) | 2015-09-21 |
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| TW098117402A TWI500529B (en) | 2008-05-26 | 2009-05-26 | Eraser |
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| JP5596921B2 (en) * | 2008-12-26 | 2014-09-24 | 第一工業製薬株式会社 | Polyurethane resin composition and cured product thereof |
| JP5749955B2 (en) | 2011-03-24 | 2015-07-15 | 株式会社サクラクレパス | Plastic eraser, plastic eraser composite containing the same, and manufacturing method thereof |
| JP5938711B2 (en) * | 2012-05-09 | 2016-06-22 | 三菱鉛筆株式会社 | eraser |
| BR102012032157A2 (en) * | 2012-12-17 | 2015-07-07 | Ct De Tecnologia Mineral Cetem | Process for obtaining composite material consisting of polymers of plant origin, mineral filler and abrasive material and use of the composition obtained for polishing rocks |
| JP6643051B2 (en) * | 2015-01-22 | 2020-02-12 | 三菱鉛筆株式会社 | Friction member and thermochromic writing implement with friction member |
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| TW330208B (en) * | 1996-11-13 | 1998-04-21 | Horong-Bin Tsay | A novel injection moldable composition for rubber erasers |
| JP3822692B2 (en) * | 1996-12-27 | 2006-09-20 | 株式会社シード | eraser |
| JP2000025391A (en) * | 1998-07-13 | 2000-01-25 | Porishisu:Kk | Plastic eraser |
| TW200514705A (en) * | 2003-10-24 | 2005-05-01 | Flomo Plastics Ind Co Ltd | Eraser composition |
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| JPWO2009145132A1 (en) | 2011-10-13 |
| JP5205123B2 (en) | 2013-06-05 |
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