| http://www.w3.org/ns/prov#value | - Best results are usually obtained if this final distillation or polycondensation is run at a pressure not higher than 130 Pa and 240???-260??? C. for less than 2 hours in the presence of antioxidants such as sym- di- beta- naphthyl-p-phenylenediamine and 1,3,5-trimethyl-2,4,6-tri[3,5-ditertiarybutyl-4-hydroxybenzyl]benzene.
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