公开(公告)号：US20240076425A1

公开(公告)日：2024-03-07

申请号：US18280163

申请日：2022-02-24

Applicant: MITSUI CHEMICALS, INC.

Inventor： Akihiro ASANO ,  Masakazu TANAKA ,  Toyoaki SASAKI ,  Yusuke MIZOBUCHI ,  Takuya IWATA

IPC: C08F10/14 ,  C08L23/20 ,  C09D123/20

CPC classification number: C08F10/14 ,  C08L23/20 ,  C09D123/20

Abstract: To provide a 4-methyl-1-pentene polymer being excellent in storage stability when dissolved in a solvent and solubility, and being excellent in at least one of heat resistance, and a coating appearance when a coating film is stretched, for example, when such a film is bended or used in a flexible application.
A 4-methyl-1-pentene polymer (A) being a copolymer of 4-methyl-1-pentene and at least one selected from linear α-olefins having 6 to 20 carbon atoms, the 4-methyl-1-pentene polymer (A) satisfying the following requirements (I) and (II):



(I) an endotherm end temperature (TmE) in a melting (endothermic) curve measured by DSC is 230° C. or lower; and
(II) an exotherm start temperature (TcS) in a crystallization (exothermic) curve measured by DSC is 210° C. or lower.