Polymerization of macrocyclic poly(alkylene dicarboxylate) oligomers
US5466744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 9, 1995 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Jan 9, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/85
- 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 from about -25.degree. to about +25.degree. C. The resulting macrocyclic oligomers may be converted to linear polyesters by contact with catalysts including basic reagents, stannous alkoxides, organotin compounds, titanate esters and metal acetylacetonates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.