Method for preparing and polymerizing macrocyclic poly(alkylene discarboxylate) oligomers
US5039783A · kind A · utility
77Cited by
4References
15Claims
0Family size
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Key dates
| Filing date | Nov 5, 1990 |
| Grant date | Aug 13, 1991 |
| Priority date | — |
| Expiry date | Nov 5, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/87
- 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 at least one amine characterized by substantially no steric hindrance around the basic nitrogen atom. The reaction is conducted under substantially anhydrous conditions and at a temperature form about -25.degree. to about +25.degree. C. The resulting macrocyclic oligomers may be converted to linear polyesters by contact with catalysts including alkali metal salicylates, stannous alkoxides and organotin compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.