Ethylene α-olefin non-conjugated polyene copolymer, use thereof, and manufacturing method thereof

US11760819B2 · kind B2 · utility

Assignee

• MITSUI CHEMICALS, INC. · JP

Inventors

• Koji Endo · Yokohama, JP
• Mayumi Hiwara · Chiba, JP
• Sadahiko Matsuura · Sodegaura, JP
• Yusuke MIZOBUCHI · Ichihara, JP
• Yuichi Yamamura · Ichihara, JP
• Yuji Noguchi · Wako, JP
• Yuji Ishii · Osaka, JP
• Tatsuya Sakai · Tokyo, JP
• Keisuke Shishido · Ichihara, JP
• Kotaro Ichino · Ichihara, JP
• Kiyohide INOMATA · Ichihara, JP
• Fumito Takeuchi · Chiba, JP
• Kenta Ide · Singapore, SG

Key dates

• Filing date: Dec 23, 2020
• Grant date: Sep 19, 2023
• Expiry date: Nov 17, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2500/17
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The purpose of the present invention is to obtain an ethylene⋅α-olefin⋅non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene⋅α-olefin⋅non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an α-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4) 125° C. is 5-100, and (4) the B value is 1.20 or more.