Claims
- 1. Method for devulcanizing a sulphur-cured rubber, which rubber contains a network of a polymer, which polymer has a main chain of carbon atoms, in which for the vulcanization per 40 carbon-carbon bonds in the main chain a maximum of 1 unsaturated carbon-carbon bond occurs, by heating the rubber in the presence of a devulcanizing agent characterised in that the devulcanizing agent is an amine compound.
- 2. Method according to claim 1, wherein the amine compound contains an α-C atom with at least one H atom.
- 3. Method according to claim 2, wherein the amine compound is octylamine, hexadecylamine, dioctylamine, trioctylamine, benzylamine or 4-piperidinopiperidine.
- 4. Method according to claim 1, wherein the quantity of devulcanizing agent is 0,5-10 weight % in respect of the quantity of rubber.
- 5. Method according to claim 4, wherein the quantity of devulcanizing agent is 1-6 weight % in respect of the quantity of rubber.
- 6. Method according to claim 1, wherein the rubber contains a polymer with a main chain in which per 200 carbon-carbon bonds in the main chain a maximum of 1 unsaturated carbon-carbon bond occurs.
- 7. Method according to claim 6, wherein the rubber contains a polymer with a main chain in which per 1000 carbon-carbon bonds in the main chain a maximum of 1 unsaturated carbon-carbon bond occurs.
- 8. Method according to claim 1, wherein the rubber is a polymer of ethylene, an an α-olefin and at least one non-conjugated diene monomer.
- 9. Method according to claim 8, wherein the rubber contains an EPDM polymer.
- 10. Method according to claim 9, wherein the third monomer in the EPDM polymer is 5-ethylidene-2-norborneene, vinylnorbornene, dicyclopentadiene, methylnorbornene or 1,4 hexadiene.
- 11. Method according to claim 1, wherein the sulphur-cured rubber is heated during devulcanization to a temperature between 200-350° C.
- 12. Method according to claim 10, wherein the sulphur-cured rubber is heated during devulcanization to a temperature between 250-350° C.
- 13. Method according to claim 1, wherein devulcanizing the sulphur-cured rubber is carried out at a pressure between the 5-10 mPa.
- 14. Method according to claim 1, wherein devulcanizing the sulphur-cured rubber is carried out in an atmosphere from which the oxygen has been removed.
Priority Claims (2)
Number |
Date |
Country |
Kind |
1013155 |
Sep 1999 |
NL |
|
1015003 |
Apr 2000 |
NL |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a Continuation of International Application No. PCT/NL00/00623 filed Sep. 5, 2000 which designated the U.S. and was published in the English language. The contents of this PCT application are incorporated in their entirety by reference.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/NL00/00623 |
Sep 2000 |
US |
Child |
10106796 |
Mar 2002 |
US |