N-oxidation process for amino-polymers

Abstract

The present invention relates to a process for the N-oxidation of polyamine polymers comprising treating said polyamine polymers with an effective amount of hydrogen peroxide in an aqueous or partly aqueous solution in the presence of heavy metal ion sequestrant and a metal oxide catalyst selected from tungstate, molybdate and vanadate.

Description

Claims

1. A process for the N-oxidation of polyamine polymers comprising treating said polyamine polymers with an effective amount of hydrogen peroxide in an aqueous or partly aqueous solution in the presence of heavy metal ion sequestrant and a catalytic amount of metal oxide catalyst selected from tungstate, molybdate and vanadate.

2. A process according to claim 1 wherein said polyamine polymers contain units having the following structural formula: ##STR1## wherein P is a polymerisable unit, whereto the oxidisable N atom can be attached, or wherein the oxidisable N atom forms part of, the polymerisable unit.

A is ##STR2## x is or 0 or 1; R are aliphatic, ethoxylated aliphatic, aromatic, heterocyclic or alicyclic groups whereto the oxidisable N atom can be attached, or wherein the oxidisable N atom is part of, these groups.

3. A process according to claim 1 wherein said polyamine is present at a level of from 1% to 40% by weight of said aqueous or partly aqueous solution.

4. A process according to claim 1 wherein said metal oxide catalyst is present at a level of from 0.001% to 2% by weight of said aqueous or partly aqueous solution.

5. A process according to claim 1 wherein said heavy metal ion sequestrant is selected from polycarboxylate or polyphosphonate heavy metal ion sequestrants and is present at a level of from 0.005% to 2% by weight of said aqueous or partly aqueous solution.

6. A process according to claim 1 wherein said partly aqueous solution comprises an alcohol selected from methanol, ethanol, n-propanol, n-butanol, t-butanol and any mixtures thereof.

7. A process according to claim 1 wherein said process is carried out at a temperature of from 30.degree. C. to 100.degree. C. and at a pH of from 1 to 10.

8. A process according to claim 2 wherein P is a polymerisable unit wherein the oxidisable N atom is attached to and wherein R is selected from an aromatic or heterocyclic group.

9. A process according to claim 8 wherein the oxidisable N atom forms part of a heterocyclic R-group.

10. A process according to claim 9 wherein the heterocyclic R-group is selected from pyridine, imidazole and derivatives thereof.

11. A process according to claim 2 wherein the oxidisable N atom is attached to the R-group.

12. A process according to claim 11 wherein R is a phenyl group.

13. A process according to claim 2 wherein P is a polymerisable unit, whereto the oxidisable N atom forms part of the polymerisable unit and wherein R is selected from an aromatic or heterocyclic group.

14. A process according to claim 13 wherein the oxidisable N atom forms part of the R-group.

15. A process according to claim 14 wherein the R-group is selected from pyridine, imidazole and derivatives thereof.

16. A process according to claim 2 wherein the polymeric backbone is derived from the group of the polyvinyl polymers.