Process for producing polyetherester elastomer
US4256861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1979 |
| Grant date | Mar 17, 1981 |
| Priority date | — |
| Expiry date | Dec 26, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/672
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a method for producing a relatively high molecular weight copolyester which comprises the steps of PA1 (a) melt-phase copolymerizing to an inherent viscosity of about 0.50 to about 1.10 a dibasic acid component and a glycol component, the dibasic acid component consisting essentially of trans-1,4-cyclohexanedicarboxylic acid and the glycol component comprising, from about 97 to about 70 mol percent 1,4-cyclohexanedimethanol, about 3 to about 30 mol percent of a glycol having 2 to 5 carbon atoms and from about 15 to about 80 weight percent of the total polymer of a polyalkyleneether glycol, and PA1 (b) solid-phase polymerizing the copolyester from step (a) at a temperature of from about 110.degree. C. to about 200.degree. C. to a higher inherent viscosity of from about 0.60 to about 2.50, the higher inherent viscosity being at least 0.10 higher than the inherent viscosity reached in step (a). Such a process using a particular acid and particular mixture of glycols allows inherent viscosity build-up without use of temperature high enough to cause thermal degradation and the resulting odor and color formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.