- Patent Title: Method for reducing yellowness index of a polyetherimide, polyetherimide having a reduced yellowness index, and compositions and articles comprising the polyetherimide
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Application No.: US16078672Application Date: 2017-02-28
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Publication No.: US10584211B2Publication Date: 2020-03-10
- Inventor: Javier Nieves Remacha , Juan Justino Rodriguez Ordonez , Bernabe Quevedo Sanchez
- Applicant: SABIC Global Technologies B.V.
- Applicant Address: NL Bergen op Zoom
- Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
- Current Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
- Current Assignee Address: NL Bergen op Zoom
- Agency: Cantor Colburn LLP
- Priority: EP16382086 20160229
- International Application: PCT/IB2017/051171 WO 20170228
- International Announcement: WO2017/149456 WO 20170908
- Main IPC: C08F2/46
- IPC: C08F2/46 ; C08F2/50 ; C08G61/04 ; C08G73/10 ; C08J3/28 ; C08L79/08 ; C08J3/11
Abstract:
A method for reducing yellowness of a polyetherimide solution, including exposing a first solution including a solvent and a polyetherimide to light under conditions effective to provide a second solution having a yellowness index that is 1 to 100 units less than the yellowness index of the first solution, as determined according to ASTM D1925. Another aspect is a method for reducing yellowness of a polyetherimide solution including acidifying a first solution including a solvent and a polyetherimide to provide a second solution having a pH less than 5 under conditions effective for the second solution to attain a yellowness index that is 1 to 30 units less than the yellowness index of the first solution, as determined according to ASTM D1925. Polyetherimides prepared according to the method, and compositions and articles including the polyetherimide are also described.
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