Invention Grant
- Patent Title: Manufacture of dihydroxy aromatic compounds by alcoholysis of flame retardant-containing polycarbonate compositions
- Patent Title (中): 通过含阻燃聚碳酸酯组合物的醇解制备二羟基芳族化合物
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Application No.: US14440162Application Date: 2013-12-11
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Publication No.: US09428627B2Publication Date: 2016-08-30
- Inventor: Philip Wesley Bell , Vic Ignacio Fernandez , Venkata Ramanarayanan Ganapathy Bhotla , Tukaram Gunale , Alexander Stanislaus , Darshan Jayanna
- Applicant: SABIC Global Technologies B.V.
- Applicant Address: NL
- Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
- Current Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
- Current Assignee Address: NL
- Agency: Cantor Colburn LLP
- Priority: EP12382521 20121221
- International Application: PCT/US2013/074403 WO 20131211
- International Announcement: WO2014/099550 WO 20140626
- Main IPC: C08G64/00
- IPC: C08G64/00 ; C08J11/24 ; C07C68/06 ; C08G64/30 ; C08L69/00 ; C07C37/055 ; C08G63/02
Abstract:
The disclosure provides a method for recovering a dihydroxy aromatic compound and a dialkyl carbonate from a polycarbonate-containing composition comprising a polycarbonate and a phosphorus-containing flame retardant. The method comprises heating the composition in the presence of an alcohol and a transesterification catalyst having non-neutralizable groups at a temperature of 70° C. to 200° C. and a pressure of 50 mbar to 40 bar for a time sufficient to depolymerize the polycarbonate producing a dihydroxy aromatic compound and a dialkyl carbonate.
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