| http://www.w3.org/ns/prov#value | - After resupplying the catalyst, conventional phosphorus stabilizers such as phosphoric acid and/or the esters thereof such as trimethyl phosphate, triethyl phosphate, tributyl phosphate and tris-triethylene glycol phosphate may be added to the polycondensation mixture in an amount corresponding approximately to 0 to 50 ppm phosphorus.
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