Preparation of polyesters from terephthalic acid
US4780527A · kind A · utility
11Cited by
4References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 6, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | May 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/78
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Poly(butylene terephthalate) is prepared in a two-stage process wherein terephthalic acid and 1,4-butanediol are esterified in the presence of a catalytic amount of a catalyst having an organo-metallic component which is an organo-titanate compound, an organo-tin compound or a combination thereof and a salt component which is an organic acid salt or an inorganic salt. In a second step, the esterification product is subject to polycondensation. By following the foregoing procedure, the formation of tetrahydrofuran is significantly suppressed and the percent conversion of esterification products increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.