TWI438221B - 熱收縮性聚酯薄膜 - Google Patents

熱收縮性聚酯薄膜 Download PDF

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TWI438221B
TWI438221B TW100138081A TW100138081A TWI438221B TW I438221 B TWI438221 B TW I438221B TW 100138081 A TW100138081 A TW 100138081A TW 100138081 A TW100138081 A TW 100138081A TW I438221 B TWI438221 B TW I438221B
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shrinkable polyester
polyester film
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Seong Do Kim
Tae Byoung Oh
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Skc Co Ltd
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Description

熱收縮性聚酯薄膜
本發明涉及一種用作外部包裝材料等的熱收縮性聚酯薄膜,尤其涉及一種適合用作高密度聚乙烯(HDPE)容器標籤的熱收縮性聚酯薄膜。
為了在玻璃瓶或塑膠瓶上標記名稱及內容物的資訊等,一直以來使用多種標籤。以往大部分是將紙質標籤用膠水貼附於玻璃瓶或塑膠瓶上使用,但最近為了引起消費者的注意而實施多樣的印刷,或是為了記入更多的資訊而採用全裹標籤(full wrapping),因此熱收縮性薄膜正受矚目。
熱收縮性薄膜是指利用在拉伸取向後在一定的溫度以上時重新收縮為拉伸前形態的特性,用於多種形態的容器包裝上的薄膜。
高密度聚乙烯(HDPE)容器主要用於生活用品(洗髮液,潤膚露等)方面,從特性上HDPE與其他物質相比具有熱膨脹係數高,特別是從50℃開始膨脹的特點。由於HDPE的這種特性,當使用從70℃就開始收縮的現有聚酯類熱收縮薄膜時,因熱收縮薄膜在收縮機中收縮前,HDPE容器就先開始膨脹,因此熱收縮薄膜會根據膨脹的HDPE容器完成標籤貼附。但是在貼附完成後,HDPE容器的溫度達到常溫時,HDPE容器會再次收縮,結果使熱收縮薄膜不 能緊密地貼附在HDPE容器上,會導致鬆垮的型態。
因此,需要開發出一種在應用於HDPE等容器時,具有優異的粘附性的新型熱收縮性聚酯薄膜。
由此可見,上述習知技藝仍有諸多缺失,實非一良善之設計者,而亟待加以改良。而本案發明人經集思廣益後,乃亟思加以改良創新,並經多年苦心孤詣潛心研究後,終於成功研發完成本案”一種用作外部包裝材料等的熱收縮性聚酯薄膜”。
本發明的目的在於,提供一種適合用作高密度聚乙烯(HDPE)容器等的標籤的熱收縮性聚酯薄膜。
根據上述目的,本發明提供一種熱收縮起始溫度為60℃以下、玻璃化轉變溫度(Tg)為77℃以下、並且60℃的熱收縮率為2%以上的熱收縮性聚酯薄膜。
上述熱收縮性聚酯薄膜優選為65℃的熱收縮率為15%以上,70℃的熱收縮率為42%以上,80℃的熱收縮率為70%以上。
這種熱收縮性聚酯薄膜可由1種二元酸(diacid)成分和3種二醇(diol)成分進行無規共聚而成。
此外,本發明的另一目的在於,提供一種由上述熱收縮性聚酯薄膜製成的容器標籤。
本發明的熱收縮性聚酯薄膜的玻璃化轉變溫度(Tg)低於現有的薄膜,熱收縮起始溫度為60℃以下,因此適合用作HDPE容器等的標籤。
下面,更加具體地說明本發明:本發明的熱收縮性聚酯薄膜可以由1種二元酸成分和3種二醇成分進行無規共聚而成。
根據本發明的一個優選實施例,上述熱收縮性聚酯可由作為上述二元酸成分的A1)和作為上述二醇成分的B1)、B2)以及B3)進行無規共聚而成;所述A1)為對苯二甲酸和對苯二甲酸二甲酯中的一種,所述B1)為乙二醇,所述B2)為新戊二醇和環己烷二甲醇中的一種,所述B3)為在主鏈的軸上的碳原子數為3個以上的直鏈二醇。
此時,上述二醇成分中的B3)成分優選為選自二乙二醇、1,3-丙二醇、1,4-丁二醇及1,5-戊二醇。
此外,上述二醇成分中的B1)至B3)的含量優選含量如下:B1)為60~90mol%,B2)為5~30mol%,以及B3)為1~20mol%。更優選為,B1)為60~85mol%,B2)為10~25mol%,以及B3)為1~15mol%。
其結果為構成薄膜的高聚物可以具有包括下述甲至丙的重複單元的無規共聚物的結構。
在上述式中,x、y及z為各個單元結構的重複數。
具有上述組成的本發明薄膜的熱收縮起始溫度為60℃以下,例如55℃至60℃為宜。
這是因為薄膜的玻璃化轉變溫度(Tg)低於現有(約78~80℃)的溫度,所以本發明薄膜的玻璃化轉變溫度為77℃以下,例如為70℃至77℃,更優選為70℃至75℃。
其結果,使得本發明的薄膜顯示出不同于現有薄膜的熱收縮率,具體為:在水箱中進行10秒鐘熱處理時,對於橫向的熱收縮率優選為:60℃為2%以上,65℃為15%以上,70℃為42%以上,以及80℃為70%以上。更優選為,上述熱收縮率60℃為2~10%,65℃為15~40%,70℃為42~60%,以及80℃為70~75%。
本發明的熱收縮性聚酯薄膜可由下述方法製備而成,該方法包括:a)將1種二元酸和3種二醇進行混合及聚合反應,從而獲得無規共聚樹脂的步驟;b)熔融上述共聚樹脂,進行擠出,從而獲得未拉伸片材的步驟;以及c)將上述未拉伸片材沿橫向拉伸,進行熱定型的步驟。
在上述步驟b)中熔融擠出溫度優選為260℃至285℃。此外,在上述步驟c)中的拉伸比為3.5倍至4.5倍。熱定型溫度優選為65℃至95℃。這樣制得的薄膜厚度優選為20μm至90μm。
本發明還提供一種由本發明的熱收縮性聚酯薄膜製成的容器標籤。
上述容器標籤優選為用作高密度聚乙烯(HDPE)容器的標籤。此時,由於收縮起始溫度低於現有的收縮起始溫度,因此在HDPE容器等上實施貼附時,在HDPE容器完全膨脹之前,就會熱收縮,從而貼附在容器上,因此,在貼附完成後,即使在常溫下HDPE容器進行收縮,也能夠維持標籤的粘附性。
綜上所述,本案在發明技術上確屬創新,並能較習用物品增進上述多項功效,應已充分符合新穎性及進步性之法定創作專利要件,爰依法提出申請,懇請 貴局核准本件發明專利申請案,以勵發明,至感德便。
下面通過實施例對本發明進一步進行詳細說明,下述實施例僅是例示本發明,但下列實施例並不限定本發明的內容。
實施例1至3及比較例1和2:熱收縮性聚酯薄膜的製備
如下表1中所記載,通過改變組成並製備各個共聚聚酯樹脂後,將該樹脂進行熔融擠出,然後沿橫向拉伸及進行熱定型,從而分別制得了厚度為40μm的熱收縮性聚酯薄膜。此時,聚合反應條件及其它工序條件採用了本發明所屬技術領域通常使用、並且熟知的聚酯薄膜的標準製備方法。
根據下列試驗方法,對上述實施例及比較例中製備的薄膜進行評價,其結果如下表2所示。
試驗例1:熱收縮率
將試樣沿著待測定試樣的方向裁剪,使長度為300mm,並且沿著待測定試樣方向的垂直方向裁剪,使寬度為15mm,從而裁剪出長度為300mm,寬度為15mm的試樣。然後在維持要測定的溫度的恒溫水箱中,進行10秒鐘熱處理後,利用長度通過下列公式進行了計算。
收縮率(%)=[(300-熱處理後的剩餘試樣的長度(mm)/300]×100
試驗例2:HDPE容器的不合格率(粘附性評價)
將上述實施例及比較例制得的各個薄膜貼附於100個HDPE容器上後,將用手推時標籤因變松而起皺的情況作為不合格處理,將100個當中的貼附不合格的容器數用百分率表示,以此為基礎進行了如下評價。
良好:不合格率不到5%
不合格:不合格率5%以上
試驗例3:玻璃化轉變溫度(Tg)
使用示差掃描量熱計(differential scanning calorimetry,Q100,TA公司)分別測定了各個薄膜的玻璃化轉變溫度。
如從上述表2中可知,本發明的實施例製備的熱收縮性聚酯薄膜的收縮起始溫度為60℃以下,因此在貼附到HDPE容器上後,也能夠維持粘附性,但與此相反,超出了本發明範圍的比較例製備的薄膜,由於其收縮起始溫度高,因此在貼附後變松。
上述實施例僅例示性說明本發明之製備及功效,而非用於限制本發明。任何熟習此項技藝之人士均可在不違背本發明之精神及範疇下,對上述實施例進行修飾與改變。因此本發明之權利保護範圍,應如後述之申請專利範圍所列。

Claims (11)

  1. 一種熱收縮性聚酯薄膜,其特徵在於,所述熱收縮性聚酯薄膜的熱收縮起始溫度為55℃至60℃、玻璃化轉變溫度為70℃至77℃,並且60℃的熱收縮率為2%以上。
  2. 如申請專利範圍第1項所述的熱收縮性聚酯薄膜,其中該熱收縮性聚酯薄膜65℃的熱收縮率為15%以上,70℃的熱收縮率為42%以上,80℃的熱收縮率為70%以上。
  3. 如申請專利範圍第1項所述的熱收縮性聚酯薄膜,其中該熱收縮性聚酯薄膜是由1種二元酸成分和3種二醇成分進行無規共聚而成。
  4. 如申請專利範圍第1項所述的熱收縮性聚酯薄膜,其中具有下列熱收縮特性:60℃熱收縮率:2%至10%;65℃熱收縮率:15%至40%;70℃熱收縮率:42%至60%;以及80℃熱收縮率:70%至75%。
  5. 如申請專利範圍第3項所述的熱收縮性聚酯薄膜,其中該熱收縮性聚酯是由作為所述二元酸成分的A1)和作為所述二醇成分的B1)、B2)以及B3)進行無規共聚而成;所述A1)為對苯二甲酸和對苯二甲酸二甲酯中的一種,所述B1)為乙二醇,所述B2)為新戊二醇和環己烷二甲醇中的一種,所述B3)為在主鏈的軸上的碳原子數為3個以上的直鏈二醇。
  6. 如申請專利範圍第5項所述的熱收縮性聚酯薄膜,其中 該二醇成分中的B3)成分選自二乙二醇、1,3-丙二醇、1,4-丁二醇及1,5-戊二醇。
  7. 如申請專利範圍第5項所述的熱收縮性聚酯薄膜,其中該二醇成分中的B1)至B3)的含量如下:B1)為60~90mol%,B2)為5~30mol%,以及B3)為1~20mol%。
  8. 如申請專利範圍第5項所述的熱收縮性聚酯薄膜,其中該二醇成分中的B1)至B3)的含量如下:B1)為60~85mol%,B2)為10~25mol%,以及B3)為1~15mol%。
  9. 如申請專利範圍第1項所述的熱收縮性聚酯薄膜,其中該熱收縮性聚酯薄膜為沿橫向單軸拉伸的薄膜。
  10. 一種如申請專利範圍第1項所述的熱收縮性聚酯薄膜製成的容器標籤。
  11. 如申請專利範圍第10項所述的容器標籤,其特徵在於,所述容器標籤為高密度聚乙烯容器的標籤。
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