Method for preparation of macrocyclic poly(alkylene dicarboxylate) oligomers from bis(hydroxyalkyl) dicarboxylates
US5231161A · kind A · utility
66Cited by
5References
20Claims
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Key dates
| Filing date | Oct 22, 1992 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Oct 22, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/40
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Macrocyclic poly(alkylene dicarboxylate) oligomers are prepared in high yield by the reaction of a dicarboxylic acid chloride such as terephthaloyl chloride with at least one bis(hydroxyalkyl) ester such as bis(4-hydroxybutyl) terephthalate, in the presence of a highly unhindered amine or a mixture thereof with at least one other tertiary amine such as triethylamine, in a substantially inert organic solvent such as methylene, chlorobenzene or a mixture thereof. The concentration of the reagents in the reaction mixture are at least 0.08M.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.