| http://www.w3.org/ns/prov#value | - Best results are usually obtained if this final distillation or polycondensation is run at less than 5 mm pressure and at 250???-300??? C. for less than 4 hours in the presence of antioxidants such as N,N'-hexamethylene-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamamide).
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