Method for preparation of macrocyclic poly(alkylene dicarboxylate) oligomers
US5214158A · kind A · utility
46Cited by
1References
18Claims
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Key dates
| Filing date | Jun 3, 1991 |
| Grant date | May 25, 1993 |
| Priority date | — |
| Expiry date | Jun 3, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/40
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Macrocyclic polyester oligomer compositions comprising alkylene isophthalate or terephthalate units or the like are prepared by the reaction of a diol with a diacid chloride in the presence of a catalytic amount of at least one amine characterized by substantially no steric hindrance around the basic nitrogen atom, and an acid accepting amount of at least one other tertiary amine such as triethylamine. The reaction is conducted under substantially anhydrous conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.