Production of polyesters of improved whiteness

Details Production of polyesters of improved whiteness Production of polyesters of improved whiteness

1994-08-15

1996-06-04

Short, Patricia A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528308, 5283083, 5283085, 5283089, 5283088, C08G 6380

Patent

active

055233813

ABSTRACT:
Described is a process for producing linear polyesters of improved whiteness and reduced yellowness by esterification of aromatic dicarboxylic acids or transesterification of their bis(lower alkyl) esters with or without aliphatic dicarboxylic acids with diols to form bisdiol esters and their oligomers and further condensation of these preproducts to spinnable polyesters, which comprises adding to the esterification, transesterification or polycondensation hatch from 0.5 to 15% by weight of phosphorus-containing modifiers and conducting the polycondensation initially in the melt to an IV from 0.4 to 0.55 dl/g and thereafter in solid phase to an IV from 0.62 to 0.72, the indicated IV values being measured at 25.degree. C. in dichloroacetic acid. The phosphorus-containing modifiers used preferably have the formula V or VI ##STR1## where R.sup.6 is alkylene or polymethylene of 2 to 6 carbon atoms or phenyl and R.sup.5 is alkyl of 1 to 6 carbon atoms, aryl or aralkyl, in the cocondensed state. Also described are the polyesters obtained by the process and fiber materials composed of these polyesters.

REFERENCES:
patent: 3342782 (1967-09-01), Barkey et al.
patent: 3853819 (1974-12-01), Herwig
patent: 3941752 (1976-03-01), Kleiner et al.
patent: 4191715 (1980-03-01), Wu
patent: 4254018 (1981-03-01), Kowallik
patent: 5151494 (1992-09-01), Munday
Freudenberger et. al., "Posphorhaltige Polyethylenterephthalate", Angewandte Makromolekulare Chemie, Bd. 105, 1982, pp. 203-215.

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