The present invention provides a composition comprising as essential ingredients (A) 80 to 95 wt % of a noncrystalline cyclic polyolefin and (B) 20 to 5 wt % of an epoxidized diene-based block copolymer. The composition gives a noncrystalline cyclic polyolefin-based sheet which has a degree of heat distortion ratio of 5% or lower at a thermal welding temperature of 95 to 160° C. The sheet is excellent in moldability, dimensional stability, and strength in welding bonding and is excellent also in impact resistance, flexural resistance, and processability for embossing. 
본 발명은, 비결정성 고리상 폴리올레핀(A) 80~95중량%와, 에폭시화 디엔계 블록공중합체(B) 20~5중량%를 필수성분으로 하는 조성물을 사용하여, 열융착온도 95~160℃에 있어서의 열변형률이 5% 이하인 비결정성 고리상 폴리올레핀계 시트가 얻어지고, 그 시트는 열융착가공시의 성형성, 치수안정성, 융착강도, 내충격성, 내굴곡성, 엠보싱가공성이 우수하다. 