Single step process for the preparation of poly (oxyalkylene)-alpha, omega-dicarboxylic acid
US6239252A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 4, 2000 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Jan 4, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/324
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to single step process for the preparation of poly (oxyalkylene)-alpha, omega-dicarboxylic acids of the formula HO.sub.2 CCH.sub.2 O(CH.sub.2 CHRO).sub.n CH.sub.2 CO.sub.2 H, wherein R is hydrogen, methyl or mixtures of hydrogen and methyl on the individual molecule and n is an integer of from 100 to 2500, comprising the steps of reacting, an oxidising agent such as poly (oxyalkylene glycol) with Jone's reagent in a polar solvent at a temperature in the range of 10.degree. C. to room temperature for a period ranging between 1 hour to 12 hours, quenching the reaction by adding free radical scavanger, removing oxidation by-products from reaction mixture by adsorbing them on an adsorbing agent to obtain dicarboxylic acids in the solution, and evaporating the clear solution to obtain poly (oxyalkylene)-alpha, omega-dicarboxylic acids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.