Invention Grant
- Patent Title: Polycarbonate compositions having enhanced optical properties, methods of making and articles comprising the polycarbonate compositions
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Application No.: US15055916Application Date: 2016-02-29
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Publication No.: US09957351B2Publication Date: 2018-05-01
- Inventor: Johannes de Brouwer , Paulus Johannes Maria Eijsbouts , Hatem Abdallah Belfadhel , Jos Arie van den Bogerd
- 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
- Main IPC: C08G69/28
- IPC: C08G69/28 ; C08L69/00 ; C08G64/06 ; C08J5/18 ; C08G64/24 ; C08G64/28 ; H01L33/56

Abstract:
In some embodiments, a method of making a polycarbonate composition comprises: polymerizing by an interfacial polymerization, reactants comprising a starting material comprising a bisphenol-A to form a bisphenol-A polycarbonate, wherein the bisphenol-A has a purity of greater than or equal to 99.65 wt % and a sulfur content of less than or equal to 2 ppm. The polycarbonate composition has a free hydroxyl content of less than or equal to 150 ppm, and wherein a molded article of the polycarbonate composition has transmission level greater than or equal to 90.0% at 2.5 mm thickness as measured by ASTM D1003-00 and a yellow index (YI) less than or equal to 1.5 as measured by ASTM D1925.
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