Interfacial polymerization process for polycarbonate in injection molding manufacturing with use of sulfonic acid as a stabilizer
AssigneeSabic Global Technologies B.V.
InventorsTamara Marijke Eggenhuisen, Roland Sebastian Assink, Kazuhiko Mitsui, Robert Dirk van de Grampel, Mark van der Mee
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Abstract
A composition includes a polycarbonate resin formed via an interfacial polymerization process and from 0.05 ppm to 50 ppm of a sulfonic acid. A molded article formed from the composition may exhibit a yellowness index that is less than that of a reference molded article formed from substantially similar polycarbonate composition comprising the polycarbonate resin but in the absence of the sulfonic acid. Methods for forming the molded article in accordance with the above are also described.
Claims18
A method of preparing an injection molded article, comprising:
- injection molding a composition, wherein the composition comprises a polycarbonate resin formed via an interfacial polymerization process;
- and 0.05 ppm to 50 ppm by weight of a sulfonic acid, based on a total weight of the composition;
- wherein the injection molding comprises
- a maximum molding temperature of at least a last heating zone of a molding machine of at least 330 to less than 340° C. at a residence time of at least 10 minutes, or a maximum molding temperature of at least a last heating zone of a molding machine of at least 340 to less than 350° C. at a residence time of at least 6 minutes, or a maximum molding temperature of at least a last heating zone of a molding machine of at least 350 to less than 360° C. at a residence time of at least 6 minutes, or a maximum molding temperature of at least a last heating zone of a molding machine of at least 360° C. at a residence time of at least 3 minutes—wherein substantially all of the polycarbonate in the composition was formed via an interfacial polymerization process.
A method of preparing an injection molded article, comprising:
- injection molding a composition, wherein the composition comprises a polycarbonate resin formed via an interfacial polymerization process;
- wherein the polycarbonate resin has a hydroxyl phenolic endgroup concentration of 150 ppm or fewer and comprises 0.05 ppm to 50 ppm by weight of a sulfonic acid, based on a total weight of the composition;
- wherein the sulfonic acid comprises an alkylbenzene sulfonic acid, a polystyrene sulfonic acid, or a p-toluene sulfonic acid anhydride;
- wherein the injection molding comprises a maximum molding temperature of at least a last heating zone of a molding machine of 330 to less than 340° C. at a residence time of at least 10 minutes, or a maximum molding temperature of at least a last heating zone of a molding machine of 340 to less than 350° C. at a residence time of at least 6 minutes, or a maximum molding temperature of at least a last heating zone of a molding machine of 350 to less than 360° C. at a residence time of at least 6 minutes, or a maximum molding temperature of at least a last heating zone of a molding machine of at least 360° C. at a residence time of at least 3 minutes—and wherein substantially all of the polycarbonate in the composition was formed via an interfacial polymerization process.
Dependencies are inferred from the claim text.