| 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 240260 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-tris[3,5 ditertiarybutyl 4 hydroxybenzyl1benzene.
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