Partially ester-exchanged sipm and process therewith
AssigneeE. I. Du Pont de Nemours and Company
InventorsJiwen F. Duan, Xianyin Ma
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Abstract
A process for producing a partially ester-exchanged SIPM such as an alkali metal bis(2-hydroxyethyl) 5-sulfoisophthalate produced from an alkali metal dimethyl 5-sulfoisophthalate in an alcohol is disclosed. The partially ester-exchanged SIPM in an alcohol can be used to copolymerize with oligomer of terephthalic acid or dimethyl terephthalate and an alcohol. Also disclosed is a process for controlling the color of a dyeable polyester using a phosphorous compound.
Claims27
A process comprising contacting a metal SIPM with an alkylene glycol to produce a mixture and heating said mixture under a condition sufficient to effect the production of a partially ester-exchanged SIPM solution.
A process comprising contacting a partially ester-exchanged SIPM solution in a first glycol with (1) a mixture comprising a carbonyl compound and a second glycol or (2) an oligomer having 2 to about 100 repeat units derived from said carbonyl compound and said second glycol under a condition effective to produce a polymer comprising repeat units derived from said SIPM, said first glycol, said second glycol, and said carbonyl compound wherein each of said first glycol and said second glycol is independently selected from the group consisting of an alkylene glycol, a polyalkylene glycol, polyoxyalkylene glycol, and combinations of two or more thereof.
A process comprising contacting, in the presence of a phosphorus compound and a catalyst, a partially ester-exchanged SIPM with either (a) a polymerization mixture comprising a carbonyl compound and a second glycol or (b) an oligomer having 2 to about 100 repeat units derived from said carbonyl compound and said second glycol under a condition effective to produce a polymer comprising repeat units derived from said SIPM, said second glycol, and said carbonyl compound wherein
- said second glycol are each independently selected from the group consisting of an alkylene glycol, a polyalkylene glycol, polyoxyalkylene glycol, and combinations of two or more thereof;
- said phosphorus compound is selected from the group consisting of a phosphoric acid or salt thereof, a phosphorous acid or salt thereof, a polyphosphoric acid or a salt thereof, a phosphonate ester, a pyrophosphoric acid or salt thereof, a pyrophosphorous acid or salt thereof, and combinations of two or more thereof;
- and
- said phosphorus compound is introduced to said process together with or separate from said catalyst composition.
Dependencies are inferred from the claim text.