Method for introducing carbonyl groups into polymers containing double carbon-carbon linkages
Patents
| Language: |
Английский |
| Type: |
Invention |
| Number |
EP 1627890 B1 |
| Request number: |
04733505.4 |
| Request date: |
May 17, 2004 |
| patent.field.start_date: |
|
| Registration date: |
Sep 17, 2008 |
| patent.field.request_publication_date: |
Feb 22, 2006 |
The invention discloses a method for selectively introducing carbonyl groups into polymers by oxygenation of double C=C bonds of polymers with the aid of nitrous oxide (N 2 O) at a temperature comprised between 50 and 350°C and a pressure of N 2 O of from 0.01 to 100 atmospheres. The introduction of an insignificant amount of C=O groups allows one to modify the physico-chemical properties of a polymer, with its molecular weight and molecular-weight distribution preserved. Deeper oxygenation results in controlled cleavage of polymer macromolecules and makes it possible to produce oxygen-containing oligomers having a desired molecular weight.