김광웅 홍순만 김병철 2024-01-12T16:01:52Z 2024-01-12T16:01:52Z 1989-12-12 https://pubs.kist.re.kr/handle/201004/90858 표면특성이　우수한　경질폴리염화비닐　구조　발포체의　제조방법 Patent 1989-12-12 1988-11-30 4,886,837 07/277,894 US 특허 한국과학기술연구원