Method of purifying bishydroxyalkyl terephthalate
US6642350B1 · kind B1 · utility
19Cited by
0References
26Claims
0Family size
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Key dates
| Filing date | Apr 26, 2002 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Apr 26, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C67/56
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A container made of, e.g., polyethylene terephthalate is pulverized and decomposed in the presence of a catalyst by the use of a solvent such as an alcohol or glycol to obtain crude bishydroxyalkyl terephthalate. This crude bishydroxyalkyl terephthalate is then purified by filtration, a treatment with activated carbon, and a treatment with ion-exchange resins. The bishydroxyalkyl terephthalate thus obtained is condensed to produce a container or the like made of polyethylene terephthalate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.