SK CHEMICALS CO., LTD.; KIM, Seon-Mi; KIM, Jae-Sun; LEE, Minhee; LEE, So-Young; LEE, Bong-Yong; SHIN, Young Ah; PARK, Euisun; LEE, Jung A; HAN, Min-Young; AHN, Jaeseung; YOO, Taekyung; KIM, Hun-Taek Patent: WO2013/129879 A1, 2013 ; Location in patent: Page/Page column 35 ;