| http://www.w3.org/ns/prov#value | - Best results are usually obtained if this final distillation or polycondensation is run at less than 1 mm. pressure 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-tris (3,5-ditertiary-butyl-4-hydroxybenzyl)benzene.
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