PROPYLENE-ETHYLENE RANDOM BLOCK COPOLYMER AND PRODUCTION METHOD THEREFOR

• Main Authors: AOYAMA HAJIME, IWAI NOBUHIRO, ITO MASAAKI, MIZUKAMI SHIGEO
• Format: Patent
• Language: English; Japanese
• Published: 23.07.2015
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a propylene-ethylene random block copolymer having high fluidity suitable for injection molding and sufficient low bleedout and to provide a production method therefor.SOLUTION: There is provided a propylene-ethylene random block copolymer having an MFR (at 230°C and a load of 2.16 kg) of 30 to 200 g/10 min which is obtained by performing multistage polymerization using a metallocene catalyst, where the propylene-ethylene random block copolymer is composed of 70 to 90 wt.% of a crystalline copolymer component (A) insoluble in orthodichlorobenzene at 60°C and 10 to 30 wt.% of a low crystalline copolymer component (B) soluble in orthodichlorobenzene at 60°C and the crystalline copolymer component (A) and the low crystalline copolymer component (B) have characteristics such as a specific MFR. 【課題】射出成形に適した高い流動性と充分な低ブリードアウトを有するプロピレン−エチレンランダムブロック共重合体およびその製造方法を提供する。【解決手段】メタロセン触媒を用いて、多段重合することで得られ、ＭＦＲ（温度２３０℃、荷重２．１６ｋｇ）が３０〜２００ｇ／１０分のプロピレン−エチレンランダムブロック共重合体であって、６０℃のオルトジクロロベンゼンに不溶である結晶性共重合体成分（Ａ）が７０〜９０重量％と、６０℃のオルトジクロロベンゼンに溶解する低結晶性共重合体成分（Ｂ）が１０〜３０重量％からなり、及び該結晶性共重合体成分（Ａ）及び低結晶性共重合体成分（Ｂ）が特定のＭＦＲなどの特性を有することを特徴とするプロピレン−エチレンランダムブロック共重合体など。【選択図】図１