Method to prepare bis(haloimides)

US8592548B2 · kind B2 · utility

Assignee

• Sabic Innovative Plastics B.V. · NL

Inventors

• John Yupeng Gui · Schenectady, US
• Norman Johnson · Pittsfield, US
• Thomas Link Guggenheim · Greenwood, US
• David Woodruff · Clifton Park, US
• James Manio Silva · Clifton Park, US
• Farid Fouad Khouri · Clifton Park, US

Key dates

• Filing date: Dec 22, 2004
• Grant date: Nov 26, 2013
• Expiry date: Jan 12, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G73/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Bis(halophthalimides) are prepared in mixture in an organic liquid such as ortho-dichlorobenzene or anisole, by a reaction at a temperature of at least 150° C. between at least one diamine compound and at least one halophthalic anhydride in the presence of imidization catalyst. The reaction mixture is maintained at about 15% by weight solids content and rich in the halophthalic anhydride by constantly monitoring the reaction mixture using analytical methods such as high performance liquid chromatography. The product mixture may be directly employed in the direct preparation of polyetherimides, and similar slurries may be employed to prepare other polyether polymers.