TWI301845B - Gels from controlled distribution block copolymers - Google Patents
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Description
1301845 玖、發明說明: 【發明所屬之技術領域】 本發明係關於自單締基芳烴和共輛二締之新穎陰離子性 嵌段共聚物製備之凝膠。 【先前技術】 製備單埽基芳烴和共軛二烯之嵌段共聚物係為吾等所熟 悉。關於用苯乙烯和丁二缔製造線性ΑΒΑ嵌段共聚物的最 初專利之一為美國專利專利第3,149,182號。可依次將此等 共聚物氫化,以生成更穩定的嵌段共聚物,如美國專利第 3,595,942號及美國專利第!^27,145號所述。此等聚合物廣 X被稱為苯乙性後段共聚物或$ B c,s。 SBC’s具有用作黏著劑、密封劑和凝膠之長期歷史。凝膠 的最近實例可發現於美國專利第5,879,694號。油凝膠作為 蠟濁已成為受歡迎的禮物,隨著油凝膠的使用增加,有增 加其性能(以較高抗拉強度和較高伸長表示)之需要。本發 明包括一種新SBC’s,其中聚合物製造商可改變橡膠鏈段之 相谷性,以產生經改良的油凝膠。亦可將此凝膠用作(例如) 電子產品的防水包封劑/密封劑及用於電線和電纜應用。 現已發現一種以單缔基芳烴末端嵌段和單烯基芳烴與共 軛二稀整經控制分布中間嵌段為基礎之新穎陰離子性嵌段 共聚物,孩共聚物描述於同在申請中的普通轉讓美國專利 申請案第60/355,2 10號,其標題為”新穎嵌段共聚物及其製 造方法"(NOVEL BLOCK C〇P〇LYMers and meth〇d FOR MAKING SAME)。製造此等共聚物之方法詳細描述於 83491 1301845 上述專利申請案。專利所有人已發現此等新聚合物允許製 備改良的油凝膠。 【發明内容】 在本發明一方面中,吾等發現一種新穎油凝膠組合物, 其包括100重量份至少一種具有單烯基芳烴和共輛二烯之 經控制分布嵌段之經氫化嵌段共聚物及350至2000重量份 之油增量劑,其中該經氫化嵌段共聚物具有至少一個聚合 物嵌段A和至少一個聚合物嵌段b,且其中(a.)在氫化之 前’各A嵌段獨立為單烯基芳烴同聚物嵌段,且各b嵌段獨 互為至少一共軛二烯和至少一單烯基芳烴之經控制分布共 聚物後段;(b·)在氫化後,已減少0至10%之芳烴雙鍵及至 少9〇%之共軛二烯雙鍵;(c·)各A嵌段具有3,000和60,000間 足數量平均分子量,各B嵌段具有3〇,〇〇〇和3〇〇,⑽〇間之數 量平均分子量;(d.)各B嵌段包括與a嵌段相鄰的富含共軛 一埽單位之末端區域及一或多個與A不相鄰的富含單缔基 芳烴單位之區域;(e·)經氫化嵌段共聚物中的單缔基芳烴之 總量係自20至80重量% ;及⑺)各B嵌段中的單烯基芳烴之 重量百分比係介於10和75%之間。 嵌奴共聚物的一般構型較佳為A-B、A-B-A、、 ()n A、(A-B-A)nX或(A-B)nX之一;其中 n為 2 至 3〇之整 數,較佳2至15,更佳2至6,且χ為一偶合劑殘基。 【實施方式】 朴本發明的關鍵成分為包含單埽基芳烴末端嵌段和單缔基 万烃與共軛二烯之獨特中間嵌段之新穎嵌段共聚物。令人 83491 1301845 I 4的疋⑴單m加人〈獨特控制和⑺用乙醚或其他改質 ㈣為—㈣劑組分(該組分將被稱為”分布劑”)之組合導 致兩種早體的一定特徵分布(在此稱為"控制分布,,聚合, 即,聚合產生”經控制分古^ ^ . 、 布〜構),亦導致聚合物喪段中存 在某些富含單烯基芳烴之區域及某些富含共軛二烯之區 域。按照本發明意圖’”經控制分布”定義具有以下屬性之 分子結構.⑴與單晞基芳烴同聚物("A"成段相鄰的末端區 域富含(即,具有大於平均之量)共軛二晞單位;(2)與A嵌段 不相鄰的 < 多個區域富含(即’具有大於平均之量)單婦 基芳烴單位;及(3)具有相對低純度 發明。意圖:富含”定義為切平均之量,較佳大於平^ 。用^掃描量熱法(”dsc")熱方法或機械方法分 斤,或由質子核磁共振("H_NMR")方法顯*,相對低後段 :可由’、存在任—單獨單體Tg,s間控制分布嵌段中間體的 單玻璃轉移恤度(Tg)顯示。嵌段度的可能性亦可自測量 適用於檢測B嵌段聚合期間聚苯乙埽基㈣基波長範圍的 並可見吸收度推斷。此值的尖銳及實質增加顯示聚苯乙 :基趣鏈末端的實質增加。在此製程中,這僅在共輛二婦 /辰度下降到低於保持經控制分布聚合的臨界水平發生。在 此點存在㈣何苯⑽單體將以嵌段體方式加人。由孰諸 :藝者用質子職檢測,,,苯乙婦嵌段度•,定義為在聚合物 ’上具有兩個s最接近相鄰體的聚合物中s單位之比例。苯 乙埽嵌段度在如下用Η“ NMR測量兩個試驗量後決定·· 首先測足丰乙缔單位的總數(即,測定時消除的任意儀器 83491 1301845 單位)’為此,將Η-1 NMR波1晉中的全部苯乙缔芳系信號自 7.5至6.2 ppm積分,並將該量除以5,以說明各苯乙烯芳環 上5個芳系氫。 其次測定嵌段體苯乙錦r單位,為此,將Η-1 NMR波譜中 的那部分芳系信號自6.88和6.80間之信號最小值至6.2PPm 積分,並將該量除以2,以說明各嵌段體苯乙烯芳環上的2 個鄰位氫。將此信號賦予具有兩個苯乙烯最接近相鄰體的 那些苯乙烯單位環上的兩個鄰位氫報告於FA.鮑維 (Bovey),咼分子咼分辨 NMR(High Resolution NMR of Macromolecules)(Academic Press,New Y〇rk and London, 1972),第 6章。 苯乙烯嵌段度簡單為嵌段體苯乙晞對全部苯乙烯單位之 百分比: 嵌段體%=100X(嵌段體苯乙晞單位/全部苯乙婦單位)’ 將η大於0時如此表示的聚合物-Bci-S-(S)n-S-Bd-聚合物 足義為欲段體私乙稀。例如,如果以上實例中η等於8,則 其嵌段度指數應為80%。嵌段度指數較佳小於40。對於具 有10重量%至40重量%苯乙烯含量的一些聚合物,嵌段度指 數較佳小於1 0。 該經控制-分布結構對控制所得共聚物之強度及Tg很重 要,因為該經控制分布結構保證兩種單體實質上沒有相分 離,即,與其中單體實際作為有不同Tg’s的分離微相對照, 但同時又確實化學結合在一起。該控制分布結構保證只存 在一個T g,因此,所得共聚物之熱性能可以預言,並可實 83491 1301845 際測定。此外,在隨後將具有此控制分布結構之共聚物作 為一個嵌段用於二嵌段、三嵌段或多嵌段共聚物時,則由 存在適宜組成經控制分布共聚物區域可能產生的相對較高
Tg傾向於改良流動性及處理性。亦可取得某些其他性能改 進。 在本發明一較佳具體實施例中,主題經控制分布共聚物 嵌段具有三個不同區域-兩個在嵌段末端上富含共軛二婦 之區域及一在接近嵌段中間或中心的富含單埽基芳烴單位 之區域。所需要者為單稀基芳烴/共軛二烯經控制分布共聚 物飲段’其中單烯基芳烴單位之比例在接近嵌段中間或中 心逐漸增加到最大,隨後逐漸降低,直至聚合物嵌段完全 氷合化。此結構有別且不同於先前技藝中討論的錐形及/或 無規結構。 用於製備本發明新穎經控制分布共聚物之原料為初始單 體。缔基芳烴可選自苯乙晞、甲基苯乙浠、對甲基苯乙 烯乙烯基甲苯、乙晞基莕和對丁基苯乙稀或其混合物。 在此等物質中,苯乙烯最佳並可自各製造商購得而且相對 廉價。在此所用的共軛二婦為丨,3_丁二烯及經取代丁二烯, 如異戊二婦、戊間二婦、2,3-二甲基4,3-丁二烯及丨_苯基 •1,3 _ 丁一烯-或其混合物。在此等物質中,1,3 - 丁二烯最佳。 在本文及申請專利範圍中,丁二埽明確指” 1,3- 丁二烯,,。· 如上所討論,經控制分布聚合物嵌段具有一(多)個與八嵌 段相鄰的*含二締之區域及一與八嵌段不相鄰且一般接近 B嵌段中心的富含芳烴之區域。與A嵌段相鄰的區域一般包 83491 -10- 1301845 括第一 15至25%嵌段,且包括一(多)個富含二烯之區域,餘 者被認為富含芳烴。”富含二烯”指該區域比富含芳烴區域 具有可測較咼二烯對芳烴之比,另一種表示方式為,單烯 基芳烴單位之比與聚合物鏈一道在接近嵌段中間或中心逐 漸增加到最大限度(如果描述ABA結構),然後逐漸降低, 直到聚合物淚段完全聚合化。對於經控制分布的嵌段Β,單 烯基芳烴之重量百分比在約10和約75%之間。 在本文中,”熱塑性嵌段共聚物”定義為具有至少一個單 烯基芳烴之第一嵌段(如苯乙烯)和二稀與單烯基芳烴之經 控制分布共聚物之第二歲段之嵌段共聚物。製備此熱塑性 肷段共聚物之方法係由一般已知用於嵌段聚合的方法進 行。本發明包括一種熱塑性共聚物組合物作為一具體實施 例,該組合物可為二嵌段、三嵌段共聚物或多嵌段組合物。 如果為二嵌段共聚物組合物,則一個嵌段為以烯基芳烴^ 基礎的同聚物嵌段,而與之聚合的則為一種二烯和晞基芳 烴之經控制分布共聚物之第二嵌段。如果為三嵌段1合 物,則其包括玻璃態以烯基芳烴為基礎的同聚物作為端嵌 段,並包括一種二缔和烯基芳烴之經控制分布共聚物作為 中間嵌段。在製備三嵌段共聚物組合物時,在本文中將經 控制分布二,/晞基芳烴共聚物指定為"Β,,,而將以晞基芳 烴為基礎的同聚物指定為”Α”。可由順序聚合或偶合製造 Α-Β-Α,三嵌段組合物。在順序溶液聚合技術中,首先引 入單烯基芳烴,以產生相對較硬芳系嵌段,隨後引入經控 制分布二烯/烯基芳烴混合物,以生成中間嵌段,再隨後引 83491 *11- 1301845 入單缔基芳烴,以生成末端嵌段。除線性A-B-A構型外, 可使肷段構成輕射狀(分支)聚合物(A-B)nX,或使兩種類型 結構在混合物中組合。為給予強度,可存在一些A_B二嵌段 聚合物,但較佳至少約30重量〇/。之嵌段共聚物為A_B_A或輕 射狀(或另外分支,以每分子具有2或更多個末端樹脂性嵌 段)。 控制不同嵌段的分子量亦很重要。對AB二嵌段,所需歲 段重量對單烯基芳烴A嵌段為3,000至60,000,而對經控制 分布共辆二烯/單晞基芳烴B嵌段為3〇,〇〇〇至3〇〇,〇〇〇。A嵌 段的較佳範圍為5000至45,000,而B嵌段的較佳範圍為 50,000至250,〇〇〇。對於可為順序ΑΒΑ或經偶合(ΑΒ)2χ嵌段 共聚物的三嵌段而言,A嵌段應為3,000至60,000,較佳5000 至45,000’而順序嵌段的B嵌段應為約30,000至300,〇〇〇,而 經偶合聚合物的B嵌段(兩個)則為那量的一半。三嵌段共聚 物的〜、平均分子量應為4〇, 〇〇〇至4〇〇, 〇〇〇,而輕射狀共聚物 應為6〇,〇〇〇至6〇〇,〇〇〇。此等分子量由光散射檢測精確測 足,並作為數量平均分子量表。 本發明的另一重要方面為控制經控制分布共聚物嵌段中 共輛二埽的微結構或乙婦基含量。”乙烯基含量"指由丨,2-加成聚合的-共軛二烯(在丁二烯情況下-如果為異戊二烯, 則應為3,心加成)。雖然在1,3-丁二晞的1,2-加成聚合下只生 成·、屯乙埽基’但異戊二婦的3,4-加成聚合(及其它共輛二 缔的類似加成)對嵌段共聚物的最終性能影響將相似。”乙 缔基&在聚合物鏈上存在懸垂乙烯基。當提及用丁二晞作 83491 -12- 1301845 坪呷w貝卞nmr分析測定,孑乂 Ί王六茱物嵌 ⑽謂莫耳。/。經縮合丁二缔單位具有丨,乙缔基構型,】 佳30至70莫耳%經縮合丁二晞單位應具有i,2•乙缔基構 型。14由改變分布劑的相對量有效控制。如吾等所瞭解, 分布劑服務於兩個目的,其產生單烯基芳烴和共輛二缔的 經控制分布,且亦控制共軛二烯的微結構。分布劑對鋰的 適合比例揭tf且教示於美國專利第Re27,145&,其揭示係 以引用之方式併入本文中。 μ 本發明熱塑性彈性體二嵌段及三嵌段聚合物包括一或多 個經控制分布二缔/烯基芳烴共聚物嵌段及一或多個單埽 基芳烴嵌段,该聚合物的一個重要特徵為它們具有至少兩 個Tg’s,較低者係作為其組成單體Tg,s中間體的經控制分布 共聚物嵌段之組合Tg。此Tg較佳至少為-60°C,更佳自_40 C至+30 C,最佳自-40至+ 1〇。〇。單烯基芳烴”玻璃態,,‘ 段之第二Tg較佳大於8〇。〇,更佳自80至ll〇°c。存在兩個 Tgfs說明嵌段的微相分離,這將有助於寬範圍應用中材料 的顯著彈性和強度及其容易處理和理想熔體流動特性。 嵌段共聚物係選擇性氩化。氫化可由先前技藝上已知的 幾種氫化或選擇性氫化方法進行。例如,此氫化已用一些 方法.完成,如美國專利第3,494,942號、第3,634,594號、第 3,670,054號、第3,700,633號及第Re· 27,145號所教示者。 氫化可在此等已減少至少90%共軛二晞雙鍵且已減少〇和 1〇重量%間之芳烴雙鍵之條件下進行。較佳範圍為減少至 少95%共軛二烯雙鍵,更佳減少98%共軛二烯雙鍵。或者, 可將聚合物氫化,使芳系不飽和度亦減少到低於上述丨0〇/〇 83491 -13- 1301845 水平以上。在那種情沉下,共軛二晞和芳烴二者的雙鍵可 減少90%或更多。 在另一選擇性方面,可以數種方式使本發明之後段共聚 物έ能化。一種方式為用具有一或多個官能基或其衍生物 之不飽和單體處理,如羧酸基團及其鹽、酐、酯、醯亞胺 基、醯胺基團及醯氯。欲接枝到嵌段共聚物的較佳單體單 為馬來酸、馬來酸、冨馬酸及其衍生物。官能化此等喪 段共聚物的進一步說明可發現於格真(Gergen)等人的美國 專利第4,578,429號及美國專利第5,506,299號。在另一種方 式中,可藉由將含矽或硼之化合物接枝到聚合物使本發明 之選擇性氫化嵌段共聚物官能化,如美國專利第4,882,384 號中教示。在另外一種方式中,可使本發明之嵌段共聚物 與燒氧基矽烷化合物接觸,以生成經矽烷改質的嵌段共聚 物。在另一種方式中,為使本發明之嵌段共聚物官能化,: 可使至少一環氧乙烷分子與聚合物反應,如美國專利第 4,898,914號所教示,或使該聚合物與二氧化碳反應,如美 國專利第4,970,265號所教示。此外,可使本發明之嵌段共 聚物金屬化,如美國專利第5,2〇6,300號及第5,276,101號所 教示’其中使聚合物與一種烷基鹼金屬接觸,如烷基鋰。 更進一.步,可藉由將磺基接枝到聚合物使本發明之嵌段共 聚物官能化,如美國專利第5,516,831號所教示。 本發明油凝膠所用的一種組分為聚合物增量油或增塑 。尤佳為與歆段共聚物之彈性體鏈段相容的類型油。雖 然較高芳系含量的油令人滿意,但較佳使用以石油為基礎 83491 -14- 1301845 。此等油包括; 較佳具有高於 的具有低揮發性及小於5 0%芳系含量之白、、由 石蠟油或環烷油。油應額外具有低揮發性, 2 6 0 C (5 0 0 °F )之初始滞點。 —可用於本發明的選擇性增塑劑之實例為無規或順序聚合 苯乙烯及共輛二燁(如丁二稀或異戊二缔)之寡聚物、丑辆 二婦之寡聚物、液態聚及乙埽橡膠,且均 具有在300至35,000之重量平均分子量,較佳小於25〇〇〇莫 耳重量。 所用油或增塑劑之量以每1〇〇重量份橡膠或嵌段共聚物 計自350至2000重量份,較佳4〇〇至1〇〇〇重量份。 可在油凝膠調配物中包括各種填料和顏料,以對油凝膠 著色並降低成本。適用填料包括碳酸鈣、黏土、滑石、矽 石氧化鋅、一氧化鈇及類似者。填料之量以調配物計通 吊在0至30重量%之範圍内,該量依所用填料類型及油凝漆 的應用而定。 了進步用加入其他聚合物、增強劑、抗氧化劑、穩定 劑、阻燃劑、防黏劑、潤滑劑及其它不脫離本發明範圍的 橡膠和塑性混合成分將本發明之組合物改質。此等成分揭 不於各專利中,包括美國專利第3,239,47δ號及第5,777,043 號,其揭示_係以引用之方式併入本文中。 可將本發明之組合物設計用於多種用途和應用。不僅可 將它們用作電子產品的防水包封劑/密封劑及用於電線和 電纜應用,而且可用於製備蠟燭及類似物。 關於各種成分的相對量,此量部分依賴特定最終用途及 83491 -15- 1301845 太特疋取終用途選擇的料嵌段共聚物。 -二本發明中包括的概念性組合物: 一 經控制分布聚合物。 “物“發明之 衣A ··應用、組合物及範圍
發說明本發明。此等實例不用於限制本 重量:二此解釋。除非另外指明,各量係以 夏丫刀或重I百分比計。實例中所 試… 万法為美國材料 八骀學會万法(ASTM),並使用以下特定方法: 環球軟化點 ASTM DJ6 ;
溶體黏度 ASTM 抗拉性能 ASTM D_412 實例1 根據以上引用的同在申請中專利申請案第6〇/355,21〇號 (包括同時申請的其接續申請案)中揭示方法製備本發明5: 各種.經控制分布嵌段共聚物。所有聚點物均為選擇氫化的 AB或ΑΒΑ嵌k共聚物,其中A嵌段為聚苯乙埽嵌段,而氧 化前的B嵌段為具有富含丁二埽單位之末端區域及富含苯 乙烯單位之中心區域疋苯乙烯丁二缔經控制分布嵌段。各 種聚合物顯示於以下表1中。然後將此等聚合物用於其他實 例中所述的各種用途。步驟丨MW為第—A嵌段之分^量貝 83491 -16 - 1301845 步驟II MW為AB嵌段之分子量,步驟III MW為ΑΒΑ嵌段之 分子量。將聚合物氫化,以使減少大於約95%之二烯雙鍵。 表1.經控制分布聚合物 聚合物 編號 步驟I MW(k) 步驟Π MW(k) 步驟m MW(k) 步驟Π中 苯乙烯% 苯乙烯 嵌段度 1,2-BD PSC (%) (%) 25 9.1 89 97 25 0 36 39 27 7.5 70 77 25 3 36.1 40 28 7.8 39 25 16 36 39 26 7.3 43 50 37 0 36.7 47 在此,’fMW(k)’’=以千計的分子量,”PSC(%)n =最終聚合物 中的苯乙烯重量%。π苯乙烯嵌段度’’只用於B嵌段。 因此,聚合物#25為具有9,500-80,000-9,500之數量平均嵌 段莫耳重量之線性ΑΒΑ三嵌段共聚物;聚合物#27為具有 7,5 00-62,600-7,300之嵌段莫耳重量之線性八3人三嵌段共聚 物;聚合物#28為具有7,800-3 1,500之嵌段莫耳重量之AB二 嵌段共聚物;且聚合物#26為具有7,300-35,800-7,300之嵌段 莫耳重量之線性ΑΒΑ三嵌段共聚物。 實例2 · 實例2顯示在油凝膠中使用新穎CD聚合物#25。樣品 #2-1、2-2·及2-3顯示以習知經氫化SBC、SEBS#1為基礎的 凝膠之性能。SEBS#1為一種具有約10,000之聚苯乙烯末端 嵌段及約50,000之經氫化聚丁二烯中間嵌段之選擇性氫化 83491 -17- 1301845 SBS嵌段共聚物。結果顯示,聚合物含量增加,軟化點及 抗拉性能改良,且熔體黏度增加。樣品#2-4、2-5及2-6顯示 用CD聚合物#25發現同樣趨向。然而,令人驚訝的是,CD 聚合物#25得到比習知經氫化聚合物抗拉強度更高且伸長 更高之凝膠。DRAKEOL 34係自盤瑞克(Penreco)購得,其 係一種具有-64°C之Tg之石蠟系處理油。 表2 組合物, 重量% #2-1 #2-2 #2-3 #2-4 #2-5 #2-6 DRAKEOL 34 90 85 80 90 85 80 SEBS#1 10 15 20 CD聚合物#25 10 15 20 熔體黏度@149 °C,毫帕·秒 (厘泊) 185 750 3,870 235 2210 17,500 y R&B軟化點,°C 85 96 106 89 104 117 抗拉強度,千帕 (镑/平方英寸) 太軟 117(17) 352(51) 太軟 128(18.5) 545(79) 伸長@ _ 斷裂,% 280 540 460 760 83491 -18-
Claims (1)
- rmm公告fl 102529號專利申請案 請專利範圍替換本(97年7月)申請專利範圍:许年干月千日修(更)正本 1 · 一種油凝膠組合物,其包括1 〇〇重量份之至少一具有單 烯基芳烴和共軛二烯之經控制分布嵌段之經氫化嵌段 共聚物及350至2000重量份之油增量劑,其中該經氫化 般段共聚物具有至少一個聚合物嵌段A和至少一個聚 合物嵌段B ’且其中(a·)在氫化之前,各a嵌段獨立為單 烯基芳煙同聚物嵌段,且各B嵌段獨立為至少一共軛二 烯和至少一單烯基芳烴之經控制分布共聚物嵌段;(b .) 在氯化後,已減少〇至丨0%之芳烴雙鍵及至少9〇%之共輛 一烯雙鍵;(c·)各A嵌段具有3,000和60,000間之數量平 均刀子里’且各B嵌段具有3〇, 〇〇〇和300, 〇〇〇間之數量平 均刀子i ’(d·)各B嵌段包括與a嵌段相鄰的富含共輛二 烯單位之末端區域及一或多個與A嵌段不相鄰的富含 單烯基芳烴單位之區域;(e)經氫化嵌段共聚物中的單 烯基芳烴之總量係自20至80重量%;且(f·)各B嵌段中的 單稀基芳之重量百分比係介於1〇和75%之間。 2·根據申請專利範圍第丨項之油凝膠組合物,其中該單烯 基方烴為苯乙烯,而該共軛二烯係選自異戊二烯及丁二 烯0 3. 4. 根據申請專利範圍第1或2項之油凝膠組合物,其中該共 軛烯為丁二烯,且其中該嵌段3中至少2〇至8〇莫耳%之 經縮合丁二烯單位具有丨,)—構型。 根據申請專利範圍第…項之油凝膠組合物,其中該嵌 段B之苯乙烯嵌段度係小於4〇莫耳%,該苯乙烯嵌段度 83491-970707.doc 1301845 扣數係定義為在聚合物鏈上具有兩個苯乙烯相鄰體之 肷段B中的苯乙烯單位之比例。 才據申明專利範圍第1或2項之油凝膠組合物,其中該各 段中的笨乙烯之重量百分比係介於1〇%和3〇%之 間而各肷段B之苯乙烯嵌段度指數係小於丨〇。 6·根據申睛專利範圍第i或2項之油凝膠組合物,其中該經 氫化肷段共聚物為一 ABA、(A_B)n、(A_B)^A4 (Α_Β)ηΧ 甘欠段共聚物,其中該11為2至3〇之整數,X為偶合劑殘 基’該後段共聚物具有4〇,〇〇〇至14〇,〇〇〇之總分子量,且 其中各Β嵌段具有1 〇和3 〇重量%間之苯乙烯。 7·根據申請專利範圍第1或2項之油凝膠組合物,其中該油 增量劑為一種具有低揮發性及小於5〇%芳系含量的以 石油為基礎之白油。 83491-970707.doc
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