KR20170060164A - 미세다공막, 이러한 막의 제조 방법 및 사용 방법 - Google Patents
미세다공막, 이러한 막의 제조 방법 및 사용 방법 Download PDFInfo
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Abstract
Description
Claims (24)
- 복수의 층으로 이루어진 미세다공막으로서,
적어도 1개의 층은 115.0~130.0℃ 범위의 Tm 및 5.0×103~4.0×105의 Mw를 갖는 제 1 폴리머를 포함하고,
130.5℃ 이하의 셧다운 온도 및 170.0℃ 이상의 파열 온도를 갖고, 35℃/분의 속도로 가열을 실시하는 경우에 175℃ 이하의 온도에서 1.0×104(Ω)(㎠)의 표면 임피던스가 얻어지는 것을 특징으로 하는 미세다공막. - 제 1 항에 있어서,
제 1 폴리머는 115.0℃ 이상 130.0℃ 이하의 Tm을 갖는 폴리올레핀인 것을 특징으로 하는 미세다공막. - 제 1 항에 있어서,
제 1 폴리머는 121.0~125.0℃ 범위의 Tm을 갖는 에틸렌/α-올레핀 코폴리머이고, 적어도 막의 제 2 층은 5.0×105 이상의 Mw 및 150℃ 이상의 Tm을 갖는 폴리프로필렌을 포함하는 것을 특징으로 하는 미세다공막. - 제 1 항에 있어서,
700초/100㎤/20㎛ 이하의 정규화 투기도를 갖는 것을 특징으로 하는 미세다공막. - 제 3 항에 있어서,
에틸렌/α-올레핀 코폴리머를 포함하는 제 3 층을 더 포함하고, 제 2 층은 제 1 층과 제 3 층 사이에 위치하는 것을 특징으로 하는 미세다공막. - 제 5 항에 있어서,
제 1 층 및 제 3 층은 각각 제 1 층 또는 제 3 층의 중량을 기준으로 해서 3중량%~50중량%의 에틸렌/α-올레핀 코폴리머를 각각 독립적으로 포함하고, 제 2 층은 제 2 층의 중량을 기준으로 해서 40중량% 이하의 폴리프로필렌을 포함하는 것을 특징으로 하는 미세다공막. - 제 5 항에 있어서,
제 1 층 및 제 3 층은 각각 제 1 층 또는 제 3 층의 중량을 기준으로 해서 40중량%~97중량%의 1.0×106 이하의 Mw를 갖는 폴리에틸렌, 및 0중량%~25중량%의 1.0×106을 초과하는 Mw를 갖는 폴리에틸렌을 각각 독립적으로 더 포함하고, 제 2 층은 폴리에틸렌을 더 포함하는 것을 특징으로 하는 미세다공막. - 제 7 항에 있어서,
제 2 층은 15중량%~40중량%의 폴리프로필렌, 0중량%~10중량%의 1.0×106을 초과하는 Mw를 갖는 폴리에틸렌, 및 50중량%~85중량%의 1.0×106 이하의 Mw를 갖는 폴리에틸렌(중량%는 제 2 층의 중량 기준)을 포함하는 것을 특징으로 하는 미세다공막. - 제 3 항에 있어서,
에틸렌/α-올레핀 코폴리머는 약 1.0~5.0mol% 범위의 코모노머 함유량을 갖고, 코모노머는 헥센 또는 옥텐인 것을 특징으로 하는 미세다공막. - 제 1 항에 있어서,
약 50.0~약 7.00×102초/100㎤/20㎛ 범위의 정규화 투기도를 갖는 것을 특징으로 하는 미세다공막. - 제 1 항에 있어서,
35℃/분의 속도로 가열을 실시하는 경우에 150℃~160℃의 온도에서 1.0×104(Ω)(㎠)의 표면 임피던스를 갖는 것을 특징으로 하는 미세다공막. - 제 1 항에 있어서,
3000mN/20㎛ 이상의 정규화 천공 강도 및 20~50%의 다공도를 갖는 것을 특징으로 하는 미세다공막. - 다층 미세다공막으로서,
제 1 층 및 제 3 층은 각각 제 1 층 및 제 3 층의 중량을 기준으로 해서 20.0중량%~30.0중량%의 1.0×104~7.0×104의 Mw를 갖는 에틸렌/α-올레핀 코폴리머, 45.0중량%~70.0중량%의 1.0×106 이하의 Mw를 갖는 폴리에틸렌, 및 0.0중량%~35.0중량%의 1.0×106을 초과하는 Mw를 갖는 폴리에틸렌을 서로 독립적으로 포함하고;
제 1 층과 제 3 층의 사이에 위치하는 제 2 층은 20.0%~80.0중량%의 1.1×106의 Mw 및 110.0J/g을 초과하는 융해열을 갖는 폴리프로필렌, 0중량%~10.0중량%의 1.0×106을 초과하는 Mw를 갖는 폴리에틸렌, 및 20.0중량%~70.0중량%의 1.0×106을 초과하는 Mw를 갖는 폴리에틸렌(중량%는 제 2 층의 중량 기준)을 포함하고,
130.5℃ 이하의 셧다운 온도 및 170.0℃ 이상의 파열 온도를 갖고, 35℃/분의 속도로 가열을 실시하는 경우에 175℃ 이하의 온도에서 1.0×104(Ω)(㎠)의 표면 임피던스가 얻어지는 것을 특징으로 하는 다층 미세다공막. - 제 1 항 또는 제 13 항에 기재된 미세다공막의 제조 방법으로서,
a. 115.0℃~130.0℃ 범위의 Tm 및 5.0×103~4.0×105 범위의 Mw를 갖는 폴리머를 포함하는 적어도 제 1 폴리머와 적어도 1종의 제 1 희석제를 혼합하는 공정;
b. 1.0×106 이상의 Mw를 갖는 적어도 폴리프로필렌과 적어도 제 2 희석제를 혼합하는 공정;
c. 제 1 폴리에틸렌을 함유하는 제 1 층, 제 3 폴리에틸렌을 함유하는 제 2 층, 및 제 1 층과 제 3 층의 사이에 위치하는 폴리프로필렌을 함유하는 제 2 층을 갖는 다층 압출물을, 제 1 폴리머와 폴리프로필렌과 희석제를 혼합한 것으로부터 형성하는 공정; 및
d. 제 1 희석제, 제 2 희석제, 및 제 3 희석제의 적어도 일부를 연신 다층 압출물로부터 제거해서 막을 제조하는 공정을 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
115.0℃~130.0℃ 범위의 Tm 및 5.0×103~4.0×105 범위의 Mw를 갖는 폴리머를 포함하는 적어도 제 3 폴리머와 적어도 1종의 제 3 희석제를 혼합하는 공정을 더 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
제 1 폴리머 및 제 3 폴리머는 폴리올레핀을 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
제 1 폴리머는 121.0~125.0℃ 범위의 Tm을 갖는 에틸렌/α-올레핀 코폴리머를 포함하고, 제 2 폴리프로필렌은 5.0×105 이상의 Mw 및 150℃ 이상의 Tm을 갖는 폴리프로필렌을 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
공정(d) 전에 다층 압출물을 연신하는 공정 및 공정(d) 동안 또는 후에 임의의 휘발종의 적어도 일부를 막으로부터 제거하는 공정을 더 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
(a) 제 1 희석제와 혼합한 제 1 폴리머의 양은 약 15~40중량% 범위이고, 제 1 희석제의 양은 85~60중량% 범위이며(중량%는 모두 제 1 폴리머와 제 1 희석제를 혼합한 것 기준);
(b) 제 3 희석제와 혼합한 제 3 폴리머의 양은 약 15~40중량% 범위이고, 제 3 희석제의 양은 85~60중량% 범위이며(중량%는 모두 제 3 폴리머와 제 3 희석제를 혼합한 것 기준); 그리고
(c) 제 2 희석제와 혼합한 폴리프로필렌의 양은 약 15~40중량% 범위이고, 제 2 희석제의 양은 85~60중량% 범위인(중량%는 모두 폴리프로필렌과 제 2 희석제를 혼합한 것 기준) 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
다층 압출물은 1.0×106 초과의 Mw를 갖는 폴리에틸렌을 더 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
다층 압출물은 1.0×106 이하의 Mw를 갖는 폴리에틸렌을 더 포함하는 것을 특징으로 하는 미세다공막의 제조 방법. - 제 15 항에 있어서,
제 1 층 및 제 3 층은 각각 제 1 층 및 제 3 층 내의 폴리올레핀의 전체 중량을 기준으로 해서 3~50중량%의 115.0℃~130.0℃ 범위의 Tm 및 5.0×103~4.0×105 범위의 Mw를 갖는 폴리머, 0~25중량%의 1.0×106 초과의 Mw를 갖는 폴리에틸렌, 및 40~97중량%의 1.0×106 이하의 Mw를 갖는 폴리에틸렌을 함유하고;
제 2 층은 제 2 층 내의 폴리올레핀의 전체 중량을 기준으로 해서 15~40중량%의 폴리프로필렌, 및 0~10중량%의 독립적으로 선택되는 1.0×106 초과의 Mw를 갖는 폴리에틸렌, 및 50~85중량%의 1.0×106 이하의 Mw를 갖는 폴리에틸렌을 함유하고;
제 1 희석제, 제 2 희석제, 및 제 3 희석제는 동일한 것을 특징으로 하는 미세다공막의 제조 방법. - 제 22 항에 있어서,
제 1 층 및 제 3 층 내의 1.0×106 초과의 Mw를 갖는 폴리에틸렌은 제 2 층 내의 1.0×106 초과의 Mw를 갖는 폴리에틸렌과 동일한 것을 특징으로 하는 미세다공막의 제조 방법. - 제 14 항에 있어서,
공정(c)에 이어서 다층 압출물을 냉각하는 공정을 더 포함하는 것을 특징으로 하는 미세다공막의 제조 방법.
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