TW202130688A - 反應性熱熔黏著劑組合物及其用途 - Google Patents

反應性熱熔黏著劑組合物及其用途 Download PDF

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TW202130688A
TW202130688A TW109144034A TW109144034A TW202130688A TW 202130688 A TW202130688 A TW 202130688A TW 109144034 A TW109144034 A TW 109144034A TW 109144034 A TW109144034 A TW 109144034A TW 202130688 A TW202130688 A TW 202130688A
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adhesive composition
melt adhesive
hot melt
reactive hot
polyol
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朱宏業
車愛馥
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德商漢高股份有限及兩合公司
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Abstract

本發明係關於一種反應性熱熔黏著劑組合物及其用途。特定言之,本發明提供一種具有極佳洗滌耐性,尤其對抗菌洗衣清潔劑具有極佳耐性之黏著劑。另外,黏著劑在固化時具有極短的開放時間及良好的柔軟度。

Description

反應性熱熔黏著劑組合物及其用途
本發明係關於一種反應性熱熔黏著劑組合物及其用途。特定言之,本發明提供一種具有極佳洗滌耐性,尤其對抗菌洗衣清潔劑具有極佳耐性之黏著劑。另外,黏著劑在固化時具有極其短的開放時間及良好的柔軟度。
反應性熱熔黏著劑已廣泛用於將紡織物黏合至紡織物,尤其用於服裝或特定言之內衣製造領域以替代縫合及熱封帶,其簡化製程、節省成本、減少前置時間且獲得在市場上更具競爭力的產品。
基於異氰酸酯封端(亦稱為「NCO封端」)之聚氨酯預聚物之反應性熱熔黏著劑例如由H. F. Hüber及H. Müller描述於「Shaping Reactive Hotmelts Using LMW Copolyesters」, Adhesives Age, 1987年11月,第32至35頁。
然而,現有反應性熱熔黏著劑無法承受頻繁洗滌,尤其當使用抗菌洗衣清潔劑時。因此,在此項技術中需要克服此缺點之反應性熱熔黏著劑。
本文揭示一種反應性熱熔黏著劑組合物,其包含至少一種NCO封端之聚氨酯預聚物,該NCO封端之聚氨酯預聚物包含以下組分之反應產物: a)至少一種聚異氰酸酯; b)至少一種選自以下之多元醇:聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合;及 c)視情況存在之不同於組分b)之至少一種多元醇; 其中NCO/OH比率為組分a)之NCO基團與組分b)及組分c)之總OH基團的莫耳比,其大於1,較佳地為約1.5至約2.5。
本文亦揭示一種根據本發明之反應性熱熔黏著劑組合物用於黏合兩個基材,尤其用於服裝或內衣之用途,其中該兩個基材中之至少一者為紡織物。
下文中更詳細地闡述本標的物之其他特徵及態樣。
一般熟習此項技術者應理解,本論述僅為例示性實施例之描述,且並不意欲限制本發明之更廣態樣。
在一個態樣中,本發明大體上係關於一種包含至少一種NCO封端之聚氨酯預聚物之反應性熱熔黏著劑組合物,該NCO封端之聚氨酯預聚物包含以下組分之反應產物、基本上由其組成或由其組成: a)至少一種聚異氰酸酯; b)至少一種選自以下之多元醇:聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合;及 c)視情況存在之不同於組分b)之至少一種多元醇; 其中NCO/OH比率為組分a)之NCO基團與組分b)及組分c)之總OH基團的莫耳比,其大於1,較佳地為約1.5至約2.5。
如本文中結合數值使用之「約」係指值之數值±10%,較佳地值之數值±5%。舉例而言,「約20重量%」因此關於20±2重量%,較佳地20±1重量%。
如本文所使用之「室溫」係指溫度為約20℃至約25℃,較佳地為約25℃。
根據本發明,聚氨酯預聚物之NCO/OH比率為大於1,該比率係藉由組分a)之NCO基團的莫耳量除以組分b)及組分c)之OH基團的總莫耳量而計算。
聚氨酯預聚物係藉由使聚異氰酸酯a)與多元醇b)及c)(若存在)反應而獲得。藉由將NCO/OH比率設定為大於1,聚氨酯預聚物含有游離異氰酸酯基且由異氰酸酯基封端。作為合成交聯聚氨酯之中間物,異氰酸酯封端之聚氨酯預聚物與基材表面或環境濕氣反應以便延伸主鏈且因此形成聚氨酯聚合物。經由濕氣自大氣或基材擴散至黏著劑及後續反應,聚氨酯預聚物在大氣條件下固化。因此,聚氨酯熱熔黏著劑組合物為反應性的且為濕氣可固化的。固化黏著劑產物為主要經由脲基及氨甲酸乙酯基鍵結之交聯材料。
在一個實施例中,聚氨酯預聚物之NCO/OH比率為約1.5至約2.5。在NCO/OH比率屬於上述範圍內之情況下,聚氨酯預聚物在暴露於濕氣時充分交聯,且具有易於在未拉絲或滲透穿過紡織物之情況下噴塗的合乎需要之黏度。
在一個實施例中,按聚氨酯預聚物之總重量計,根據本發明之聚氨酯預聚物之NCO含量為約1重量%至約5重量%,較佳地約1.2重量%至約4重量%。在NCO含量屬於上述範圍內之情況下,聚氨酯預聚物在暴露於濕氣時充分交聯,且具有易於在未拉絲或滲透穿過紡織物之情況下噴塗的合乎需要之黏度。
根據本發明,聚氨酯預聚物藉由組分a)至少一種聚異氰酸酯與組分b)至少一種多元醇,視情況亦與組分c)至少一種不同於組分b)之多元醇的反應而製備,該至少一種多元醇選自聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合。
如本文中所使用,術語「聚異氰酸酯」應理解為每分子較佳地具有2至4個異氰酸酯基。較佳地,聚異氰酸酯為二異氰酸酯,其包括脂族二異氰酸酯、脂環族二異氰酸酯或芳族二異氰酸酯。
在一個實施例中,芳族二異氰酸酯係選自2,2' -亞甲基二苯基二異氰酸酯(MDI)、4,4'-亞甲基二苯基二異氰酸酯、2,4'-亞甲基二苯基二異氰酸酯、2,4-甲苯二異氰酸酯(TDI)、2,6-甲苯二異氰酸酯、1,3-伸苯基二異氰酸酯(PDI)、1,4-伸苯基二異氰酸酯、1,4-伸萘基二異氰酸酯(NDI)、1,5-伸萘基二異氰酸酯、四甲基伸茬基二異氰酸酯(TMXDI)、4,4'-二苄基二異氰酸酯、伸茬基二異氰酸酯(XDI)及其組合。
在一個實施例中,脂族異氰酸酯係選自丁烷-1,4-二異氰酸酯、1,6-六亞甲基二異氰酸酯(HMDI)、1,6-二異氰酸基-2,2,4-三甲基己烷、1,12-二異氰酸基-十二烷及其組合。
在一個實施例中,脂環族異氰酸酯係選自異佛爾酮二異氰酸酯(IPDI)、4,4-二環己基甲烷二異氰酸酯、1,3-環己烷二異氰酸酯、1,4-環己烯二異氰酸酯、1-甲基-2,4-二異氰酸酯基-環己烷及其組合。
較佳地,聚異氰酸酯係選自2,2'-亞甲基二苯基二異氰酸酯、4,4'-亞甲基二苯基二異氰酸酯、2,4'-亞甲基二苯基二異氰酸酯、2,4-甲苯二異氰酸酯、2,6-甲苯二異氰酸酯、1,6-六亞甲基二異氰酸酯、異佛爾酮二異氰酸酯或其組合。更佳地,MDI用作聚異氰酸酯。
在根據本發明之反應性熱熔黏著劑組合物中,按聚氨酯預聚物之總重量計,組分a)至少一種聚異氰酸酯之量為約10重量%至約40重量%,較佳地為約15重量%至約35重量%。
根據本發明,組分b)為至少一種選自以下之多元醇:聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合。此等特定多元醇賦予固化產物極佳耐化學性及極佳耐水解性。
在一個實施例中,各組分b)及c)之官能度為2。換言之,各多元醇b)及c)獨立地為二醇。官能度意謂每分子多元醇之羥基之平均數。
組分b)較佳地具有至少一個末端羥基,更佳地具有兩個末端羥基,其促進聚氨酯預聚物之形成。
在一個實施例中,該聚四氫呋喃、聚丁二烯多元醇及經氫化之聚丁二烯多元醇各自具有約1,000至約5,000 g/mol,較佳地約1,000至約3,500 g/mol之數目平均分子量(number average molecular weight,Mn)。屬於前述範圍內之Mn使此等特定聚醚多元醇與調配物中之其他組分相容,且調節黏著劑組合物之黏合強度及開放時間。
在本說明書中,數目平均分子量(Mn)可以藉由凝膠滲透層析法(gel permeation chromatography,GPC)根據DIN 55672,特定言之DIN 55672-1使用THF作為溶離劑來測定。
如本文中所使用,術語「聚四氫呋喃」可與聚(四亞甲基醚)二醇(PTMEG)交換,且由式HO-(-CH2 )4 O-)n -H表示。聚四氫呋喃具有極佳耐化學性及極佳耐水解性,且賦予所得聚氨酯黏著劑組合物此等特性。
在一些實施例中,聚四氫呋喃在室溫下為白色蠟質固體或液體。其在約25℃至約40℃下熔融成無色或淡黃色。
聚四氫呋喃可經由四氫呋喃之陽離子開環聚合而製備。聚四氫呋喃可例如自韓國PTG Co., Ltd以PTMEG 1000、PTMEG 1800、PTMEG 2000及PTMEG 3000購買獲得。
在一個實施例中,聚丁二烯二醇具有由式HO-(-C-C=C-C-)n -OH表示之主鏈。經氫化之聚丁二烯二醇具有由式HO-(-C-C-C-C-)n -OH表示之主鏈。聚丁二烯二醇及經氫化之聚丁二烯二醇可具有一或多個接枝於其主鏈上用於改良特性之側基。舉例而言,側基可為C1-C10烷基。聚丁二烯二醇及經氫化之聚丁二烯二醇具有極佳耐化學性、耐水解性、耐老化性及耐黃化性,且賦予所得聚氨酯黏著劑組合物此等特性。經氫化之聚丁二烯二醇在此等特性方面更佳且因此為較佳的。
在一些實施例中,聚丁二烯二醇及經氫化之聚丁二烯二醇在室溫下為無色或淡黃色液體。一些聚丁二烯二醇及經氫化之聚丁二烯二醇並不具有玻璃轉移溫度(glass transition temperature,Tg)。若具有,則其玻璃轉移溫度(Tg)通常低於0℃,例如約-30℃至約-50℃,較佳地約-30℃至約-45℃。
如本文中所提及,藉由差示掃描熱量測定(Differential Scanning Calorimetry,DSC)來量測玻璃轉移溫度(Tg)。
聚丁二烯二醇及經氫化之聚丁二烯二醇為可商購的。舉例而言,其藉由Cray Valley Corporation以產品名稱Krasol出售。聚丁二烯二醇之具體實例包括Krasol LBH-P 2000、Krasol LBH 3000及Krasol LBH-P 3000。經氫化之聚丁二烯二醇之具體實例包括Krasol HLBH-P2000及Krasol HLBH-P3000。
在一個實施例中,術語「聚碳酸酯多元醇」理解為具有重複單元-O-C(O)O-,且藉由一或多個,較佳地兩個羥基封端。聚碳酸酯多元醇,較佳地聚碳酸酯二醇具有極佳耐候性及極佳耐水解性,且賦予所得聚氨酯黏著劑組合物此等特性。
在一個實施例中,聚碳酸酯多元醇為非晶形的,因此其賦予聚氨酯預聚物良好可噴塗性且賦予固化產物良好柔軟度。聚碳酸酯多元醇在室溫下可以為固體或液體。對於非晶形固體,其玻璃轉移溫度(Tg)高於室溫。非晶形液體之玻璃轉移溫度(Tg)(若具有)低於室溫。
聚碳酸酯多元醇可以例如藉由以下方式製備:使脂族二醇,如丙二醇、1,4-丁二醇、1,5-戊二醇、1,6-己二醇、二乙二醇、三乙二醇或其混合物與二芳基碳酸酯或二烷基碳酸酯,諸如二甲基碳酸酯反應。
聚碳酸酯二醇為可商購的。舉例而言,其藉由Asahi Kasei Corporation作為一系列產品以商品名DuranolTM 出售。聚碳酸酯二醇之具體實例包括DuranolTM T5652、DuranolTM T5651、DuranolTM T5650J、DuranolTM T5650E、DuranolTM T4672、DuranolTM T4671、DuranolTM T4692、DuranolTM T4691、DuranolTM T6001、DuranolTM T6002、DuranolTM G3452及DuranolTM G3450J。
在根據本發明之反應性熱熔黏著劑組合物中,按聚氨酯預聚物之總重量計,組分b)之量為約5重量%至約70重量%,較佳地約10重量%至約60重量%,更佳地約20重量%至約60重量%。
在一個實施例中,組分c),至少一種不同於組分b)之多元醇包含於用於製備聚氨酯預聚物之反應物中。對組分c)不存在特定限制,且本文中可以使用常用於製備聚氨酯之聚醚多元醇或聚酯多元醇,只要其不會不利地影響本發明熱熔黏著劑組合物之所要特性即可。
在一個實施例中,組分c)係選自聚醚多元醇、聚酯多元醇及其組合。
組分c)可為結晶的、非晶形的或其混合物。
在一個實施例中,組分c)為結晶的且具有約40℃至約100℃之熔點。若組分c)為結晶的且具有約40℃至約100℃之熔點,則晶粒之聚集使得表面在短時間段內乾燥,因此黏著劑組合物具有極短的開放時間,諸如約1分鐘至不超過約5分鐘,較佳地約1分鐘至約2分鐘。
在另一個實施例中,組分c)為非晶形的且具有約-40℃至約40℃之玻璃轉移溫度(Tg)。較佳地,組分c)之玻璃轉移溫度(Tg)等於或高於組分b)之Tg。若組分c)為非晶形的且具有約-40℃至約40℃之玻璃轉移溫度(Tg),尤其當組分c)之Tg等於或高於組分b)之Tg時,黏著劑組合物具有較高黏度,其有助於在短時間段內使表面乾燥,從而使黏著劑組合物具有極短的開放時間,諸如約1分鐘至不超過約5分鐘,較佳地約1分鐘至約2分鐘。
組分c)為可商購的。舉例而言,組分c)之商業產品包括來自Evonik Corporation之Dnyacoll系列,諸如Tg為約-30℃至約-10℃的非晶形液體多元醇,例如Dnyacoll 7210、Dnyacoll 7230及Dnyacoll7231;Tg為約10℃至約50℃的非晶形多元醇,例如Dnyacoll 7110、Dnyacoll 7111、Dnyacoll 7130、Dnyacoll 7131、Dnyacoll 7140及Dnyacoll 7150;熔點為約40℃至約100℃的結晶多元醇,例如Dnyacoll 7320、Dnyacoll 7330、Dnyacoll 7340、Dnyacoll 7360、Dnyacoll 7362、Dnyacoll 7363、Dnyacoll 7365、Dnyacoll 7380及Dnyacoll 7381。組分c)之商業產品亦包括由Stepan Company以Stepanpol系列出售之芳族聚酯多元醇,例如stepanpol PH-56、PHN-56、PDP-70及PN-110。
在根據本發明之反應性熱熔黏著劑組合物中,按聚氨酯預聚物之總重量計,組分c)之量為約0重量%至約75重量%,較佳地約20重量%至約60重量%。
在一個實施例中,NCO封端之聚氨酯預聚物包含以下組分之反應產物、基本上由其組成或由其組成: a)約10重量%至約40重量%,較佳地約15重量%至約35重量%之至少一種聚異氰酸酯; b)約5重量%至約70重量%,較佳地約10重量%至約60重量%,更佳地約20重量%至約60重量%之選自以下之至少一種多元醇:聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合;及 c)0重量%至約75重量%,較佳地約20重量%至約60重量%之不同於組分b)之至少一種多元醇; 其皆按該聚氨酯預聚物之總重量計。
根據本發明之反應性熱熔黏著劑組合物在120℃下之布絡克菲爾德黏度(Brookfield viscosity)為約10000至約30000 cp,較佳地約15000至約20000 cp,其根據ASTM 1084-1997藉由配備有Thermosel加熱單元的布洛克菲爾德黏度計(Brookfield viscometer)RVDVII使用軸27在2.5 rpm至10 rpm下量測。
在一個實施例中,黏著劑組合物之熔融溫度為約100℃至約140℃。
在本說明書中,若未另外陳述,則熔融溫度係指根據ISO 11357,特定言之ISO 11357-3,藉由差示掃描量熱計(DSC)量測的值。具體言之,當溫度以10℃/分鐘之速率自-50℃升高至250℃時所觀測到的吸熱峰值之峰頂被視為熔融溫度。
在洗滌之後,尤其在用抗菌洗衣清潔劑洗滌之後,固化組合物之黏合強度保持率為約75%或更高,較佳地為約80%或更高,更佳地為約83%或更高。抗菌洗衣清潔劑包含至少一種清潔劑及至少一種抗菌劑。對清潔劑及抗菌劑不存在特定限制,且常用於洗衣中之彼等清潔劑及抗菌劑在本文中係適合的。舉例而言,清潔劑之可商購之實例包括購自P&G corporation的Head & Shoulder。抗菌劑之可商購之實例包括以商標名Dettol® 及Walch® 出售的產品。
在一些實施例中,根據本發明之反應性熱熔黏著劑具有極短的開放時間,例如約1分鐘至不超過約5分鐘,較佳地約1分鐘至約2分鐘。「開放時間」係指自塗覆黏著劑時至開始安裝時的最小所需時間。
在一些實施例中,根據本發明之反應性熱熔黏著劑組合物可以耐受高溫,例如在約60℃或更高、約70℃或更高、約80℃或更高及約90℃或更高之溫度下,諸如在約92℃下之洗滌。
在一些實施例中,根據本發明之固化組合物具有軟觸感,其使得該組合物適用於服裝,尤其用於內衣。
雖然黏著劑組合物若需要可如上所描述直接使用,本發明之黏著劑組合物亦可用與組合物相容之習知添加劑來調配。此類添加劑包括消泡劑、塑化劑、相容增黏劑、固化催化劑、解離催化劑、填充劑、流變改質劑、抗氧化劑、顏料、黏著促進劑、穩定劑、阻燃劑及其類似物。與根據本發明之組合物相容之習知添加劑可簡單地藉由組合潛在添加劑與組合物且判定其是否為相容來判定。若添加劑在產物內均質,則其為相容的。
一般而言,根據本發明之反應性熱熔黏著劑組合物適用於黏合兩個基材,尤其用於服裝或內衣,其中該兩個基材中之至少一者為紡織物。另一個基材可為紡織物或發泡體。具體言之,根據本發明之反應性熱熔黏著劑組合物可用於將紡織物黏合至紡織物,或在服裝中,尤其在內衣中,將紡織物黏合至發泡體。
加熱根據本發明之反應性熱熔黏著劑以熔融,且將熔融黏著劑塗覆至待黏合之基材中之一或兩者上。最終固化可使用各種條件進行。特定言之,經由空浮濕氣之作用實現固化,其中相對濕度不小於10%,較佳地不小於25%,更佳地不小於50%。
組合物通常在缺乏濕氣之情況下以其固體形式分佈及儲存。當組合物準備好使用時,在塗覆之前加熱且熔融該固體。因此,本發明包括其固體形式(通常在其經儲存及分佈時)及其液體形式(在其熔融之後,恰好在其塗覆之前)之反應性熱熔黏著劑組合物。
實例 以下實例說明本發明但並不意欲限制本發明。
材料: 組分a): MDI:   4'4-亞甲基二苯基二異氰酸酯,購自Convestro。
組分b): PTMEG 2000:聚四氫呋喃,Mn:2000 g/mol,Tg:-76℃,熔點:32℃,購自PTG Co., Ltd. HLBHP 2000:經氫化之聚丁二烯二醇,Mn:2100 g/mol,液體,Tg:-30℃,購自Cray Valley Corporation。 Duranol T 5652:聚碳酸酯二醇、非晶形,液體,Tg:-54℃,購自Asahi Kasei Corporation。
組分c): Dynacoll 7130:聚酯多元醇,非晶形,固體,Tg:30℃,購自Evonik Corporation。 Dynacoll 7210:聚酯多元醇,非晶形,液體,Tg:-15℃,購自Evonik Corporation。 Dynacoll 7231:聚酯多元醇、非晶形,液體,Tg:-30℃,購自Evonik Corporation。 Dynacoll 7360:聚酯多元醇,結晶,熔點:55℃,購自Evonik Corporation。 PES 9007:液體聚酯多元醇,非晶形,液體,Tg:-20℃,購自Xuchuan Corporation。 PN-110:聚酯多元醇,非晶形,Tg:25℃,購自Stepan Company。
預聚物製備 根據表1中所列之調配物製備預聚物。預聚物之所有組分之總重量為100重量份。
將所有多元醇添加於三頸圓底燒瓶中以熔融且真空混合直至均勻,且在130℃下脫水2小時。接著在100℃下將MDI添加至混合物,且使得聚合在110℃真空混合下進行直至1.5小時後反應完成。藉由硝化分析剩餘NCO含量以判定反應完成。
測試方法及評估 黏合強度 藉由凹版輥(X-TH13,購自Dongguan之Xinxin Corporation),在90℃至120℃下,以20 μm之厚度將如上製備之各預聚物塗覆至10 m* 0.5 m聚酯織物(購自Xiaoshan Rongli Corporation)上,且接著與另一個10 m* 0.5 m的聚酯織物一起層壓以便得到層壓樣品。層壓樣品在23℃及50%相對濕度下固化3至7天。根據JIS L1093方法A-1量測固化層壓樣品之黏合強度。各黏合強度量測3次且將平均值記錄為N1。接著將固化層壓樣品浸沒於Head & Shoulder(清潔劑,購自P&G corporation)與Dettol® (抗菌劑)之水性混合物中72小時。洗滌後之黏合強度以與N1相同之方式量測且記錄為N2。
黏合強度保持率=N2/N1* 100%
開放時間 藉由凹版輥(X-TH13,購自Dongguan之Xinxin Corporation),在100℃至140℃下,以20 μm之厚度用如上製備之各預聚物塗覆10 cm* 1 cm的紙。每30秒藉由指壓將紙條(1.5 cm* 5.0 cm)附著至經塗覆的紙。開放時間定義為直至觀測到紙條之纖維撕裂的時間。
柔軟度 藉由5名志願者之手觸摸上文針對量測黏合強度N1所獲得之固化層壓樣品。若所有5名志願者都具有柔軟手感,則固化層壓樣品視為具有良好柔軟度。
表1
組分 (重量份) 原材料 實例1 實例2 實例3 實例4 實例5 實例6 實例7 比較實例1
組分a) MDI 20 20.96 19 20.96 20.96 14.94 23.47 37.34
組分b) PTMEG 2000 20 43.91 30       60 5   
HLBH-P 2000          43.91            
Duranol T-5652             43.91         
組分c) Dynacoll 7210       20               
Dynacoll 7130 30    10               
Dnyacoll 7231    10    10 10 7.14 16.95 17.84
Dynacoll 7360    8.78 10 8.78 8.78 6.26 16.88 15.66
PN-110    16.35 11 16.35 16.35 11.66 37.7 29.16
PES 9007 30                     
總重量 (重量份) 100 100 100 100 100 100 100 100
 NCO/OH比率 2.33 1.94 2.04 2.03 1.94 1.32 1.92 3.94
 NCO含量(重量%) 3.85 3.43 3.27 3.76 3.43 1.23 3.84 9.39
洗滌前之黏合強度N1(牛/吋) 42.22 50.96 34.2 12.36 40.01 12.49 49.17 10.21
洗滌前之黏合強度N1(牛/吋) 42.38 48.66 35.01 10.57 33.54 12.1 38.38 4.64
黏合強度保持率N1/N2(%) 100.38 95.49 102.37 85.52 83.83 96.88 78.06 45.45
開放時間 120秒 90秒 100秒 80秒 110秒 70秒 300秒 15分鐘
柔軟度 良好 良好 良好 良好 良好 良好 良好 良好
如表1中之結果所示,實例1至7中製備之黏著劑組合物具有78%或更高之高黏合強度保持率、不超過5分鐘之短開放時間及良好柔軟度。在實例1至6中,組分b)之含量大於10重量%,黏合強度保持率合乎需要地較高(83%或更高),且開放時間較短(不大於2分鐘)。
實例1及3中之黏合強度在洗滌之後增加。假定此現象之原因可在於固化黏著分子在藉由水潤濕時的重排。
比較實例1中製備之黏著劑組合物並不包含組分b),且其黏合強度保持率僅為45.45%,且其開放時間長至15分鐘。
本發明之此等及其他修改及變化可在不脫離本發明之精神及範疇的情況下藉由一般技術者實踐。另外,應理解,各種實施例之態樣可整體互換或在反應物中互換。此外,一般技術者應瞭解先前描述僅借助於實例,且不意欲限制進一步描述於此等所附申請專利範圍中之本發明。

Claims (11)

  1. 一種反應性熱熔黏著劑組合物,其包含至少一種NCO封端之聚氨酯預聚物,該NCO封端之聚氨酯預聚物包含以下組分之反應產物: a)至少一種聚異氰酸酯; b)至少一種選自以下之多元醇:聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合;及 c)視情況存在之不同於組分b)之至少一種多元醇; 其中NCO/OH比率為組分a)之NCO基團與組分b)及組分c)之總OH基團的莫耳比,其大於1,較佳地為約1.5至約2.5。
  2. 如請求項1之反應性熱熔黏著劑組合物,其中按該聚氨酯預聚物之總重量計,該NCO含量為約1重量%至約5重量%,較佳地為約1.2重量%至約4重量%。
  3. 如請求項1或2之反應性熱熔黏著劑組合物,其中該至少一種聚異氰酸酯為二異氰酸酯,較佳地為選自以下之二異氰酸酯:2,2'-亞甲基二苯基二異氰酸酯、4,4'-亞甲基二苯基二異氰酸酯、2,4'-亞甲基二苯基二異氰酸酯、2,4-甲苯二異氰酸酯、2,6-甲苯二異氰酸酯、1,6-六亞甲基二異氰酸酯、異佛爾酮二異氰酸酯(isophorone diisocyanate)或其組合。
  4. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中該聚四氫呋喃、聚丁二烯多元醇及經氫化之聚丁二烯多元醇各自具有約1,000至約5,000 g/mol,較佳地約1,000至約3,500 g/mol之數目平均分子量(number average molecular weight,Mn)。
  5. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中該聚碳酸酯多元醇為非晶形的。
  6. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中組分c)係選自聚醚多元醇、聚酯多元醇及其組合。
  7. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中組分c)為結晶的且具有約40℃至約100℃之熔點;或組分c)為非晶形的且具有約-40℃至約40℃之玻璃轉移溫度(glass transition temperature,Tg)。
  8. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中該NCO封端之聚氨酯預聚物包含以下組分之反應產物: a)約10重量%至約40重量%,較佳地約15重量%至約35重量%之至少一種聚異氰酸酯; b)約5重量%至約70重量%,較佳地約10重量%至約60重量%,更佳地約20重量%至約60重量%之選自以下之至少一種多元醇:聚四氫呋喃、聚丁二烯多元醇、經氫化之聚丁二烯多元醇、聚碳酸酯多元醇及其組合;及 c)0重量%至約75重量%,較佳地約20重量%至約60重量%之不同於組分b)之至少一種多元醇; 其皆按該聚氨酯預聚物之總重量計。
  9. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中該黏著劑組合物之熔融溫度為約100℃至約140℃。
  10. 如前述請求項中任一項之反應性熱熔黏著劑組合物,其中該固化組合物在洗滌之後,尤其在用抗菌洗衣清潔劑洗滌之後,具有約75%或更大,較佳地約80%或更大,更佳地約83%或更大之黏合強度保持率。
  11. 一種如請求項1至10中任一項之反應性熱熔黏著劑組合物之用途,其用於黏合兩個基材,尤其用於服裝或內衣,其中該兩個基材中之至少一者為紡織物。
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