Process for obtaining modified polyethylene terephthalate pilling-free fibres originating from the polymer thus modified
US5300626A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 1991 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | Apr 3, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01F6/84
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a process for obtaining continuously polyethylene terephthalate modified by --SiO-- groups in a proportion of 300-700 ppm of Si during the direct esterification reaction between terephthalic acid and ethylene glycol, followed by polycondensation in a known manner by introducing methoxyethyl silicate or propyl silicate at a time when the prepolymer has a weight-average molecular mass of between 9,000 and 16,000, a polydispersity index of between 1.5 and 2, and when it is at a temperature of between 260.degree. and 290.degree. C. and at a pressure of between 1.5 and 2.5 bars, the silicate/prepolymer reaction time being at least 5 minutes. The present invention also relates to pilling-free fibres originating from the modified polyethylene terephthalate and to a process for obtaining them.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.