| 摘要 |
<p>A process comprising contacting, in the presence of a phosphorus compound, either (a) isophthalic acid with a polymerization mixture comprising a carbonyl compound and a second glycol or (b) isophthalic acid with an oligomer derived from a carbonyl compound and a second glycol under a condition effective to produce a copolymer comprising repeat units derived from said carbonyl compound or ester thereof, isophthalic acid, said glycol, and said second glycol wherein said phosphorus compound is phosphonate acid or a salt thereof, a polyphosphoric acid or a salt thereof, a phosphonate ester, a pyrophosphoric acid or salt thereof, a pyrophosphorous acid or a salt thereof, or combinations of two or more thereof; and said phosphorus compound is introduced into said process together with or separate from a catalyst.</p> |
