Invention Grant
- Patent Title: Expanded thermoplastic polyurethane particles and expanded thermoplastic polyurethane particle molded article
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Application No.: US16463755Application Date: 2017-11-15
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Publication No.: US11208537B2Publication Date: 2021-12-28
- Inventor: Tatsuya Hayashi , Nobumasa Koshita , Masaharu Oikawa
- Applicant: JSP Corporation
- Applicant Address: JP Tokyo
- Assignee: JSP Corporation
- Current Assignee: JSP Corporation
- Current Assignee Address: JP Tokyo
- Agency: Fitch, Even, Tabin & Flannery LLP
- Priority: JPJP2016-230178 20161128
- International Application: PCT/JP2017/041051 WO 20171115
- International Announcement: WO2018/096997 WO 20180531
- Main IPC: C08J9/232
- IPC: C08J9/232 ; C08J9/20

Abstract:
The present invention provides expanded beads of thermoplastic polyurethane, wherein the thermoplastic polyurethane constituting the expanded beads is an ether-based thermoplastic polyurethane, and a difference (T1−T2) between a melting peak temperature (T1) and a melting peak temperature (T2) is from 0 to 8° C., wherein the melting peak temperature (T1) is a melting peak temperature at the time of first heating in a DSC curve obtained by heating the expanded beads from 20° C. to 260° C. at a heating rate of 10° C./min, the melting peak temperature (T2) is a melting peak temperature at the time of second heating in a DSC curve obtained by cooling from 260° C. to 20° C. at a cooling rate of 10° C./min after the first heating and further heating again from 20° C. to 260° C. at a heating rate of 10° C./min, and the DSC curves are obtained by the heat flux differential scanning calorimetry in conformity with JIS K7121-1987. The expanded beads of thermoplastic polyurethane not only have excellent surface appearance and fusion bonding properties but also have a low shrinkage factor.
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