Polymer blends comprising low molecular weight nitrile rubber
View Patent ↗The present invention relates to a polymer blend containing at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 wherein said polymer blend has a multi-modal molecular weight distribution, a process for preparing said polymer blend wherein at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 are mixed in a solvent and the blend is isolated from the solvent. The present invention also relates to a process for the manufacture of a shaped article including the step of injection molding the polymer blend.
1. A polymer blend comprising at least one nitrite rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 wherein said polymer blend has a multi-modal molecular weight distribution.
2. A polymer blend according to claim 1 wherein the nitrite rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 has a Mooney viscosity (ML 1+4 @ 100° C.) below 5.
3. A polymer blend according to claim 1 wherein the nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 has a Mooney viscosity (ML 1+4 @ 100° C.) below 1.
4. A polymer blend according to claim 1 wherein the polymer blend has a bi-modal molecular weight distribution.
5. A process for preparing a polymer blend according to any of claims 1 – 4 wherein at least one nitrite rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrite rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 are mixed in a solvent and the blend is isolated from the solvent.
6. A process for the manufacture of a shaped article comprising the step of injection molding a polymer blend comprising at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrite rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 wherein said polymer blend has a multi-modal molecular weight distribution.
7. A process according to claim 6 , wherein the shaped article is a seal, gasket, belt, hose, bearing pad, stator, well head seal, valve plate, cable sheathing, wheel roller, in place gaskets or pipe seal.
8. A process for the manufacture of a shaped article comprising the step of liquid injection molding a polymer blend comprising at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 wherein said polymer blend has a multi-modal molecular weight distribution.
9. A process for the manufacture of a shaped article comprising the step of compression and/or transfer molding a polymer blend comprising at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 wherein said polymer blend has a multi-modal molecular weight distribution.
10. A process for the manufacture of a shaped article comprising the step of extruding a polymer blend comprising at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) below 10 and at least one nitrile rubber polymer having a Mooney viscosity (ML 1+4 @ 100° C.) above 30 wherein said polymer blend has a multi-modal molecular weight distribution.
11. A process according to claim 8 , wherein the shaped article is a seal, gasket, belt, hose, bearing pad, stator, well head seal, valve plate, cable sheathing, wheel roller, in place gaskets or pipe seal.
12. A process according to claim 9 , wherein the shaped article is a seal, gasket, belt, hose, bearing pad, stator, well head seal, valve plate, cable sheathing, wheel roller, in place gaskets or pipe seal.
13. A process according to claim 10 , wherein the shaped article is a seal, gasket, belt, hose, bearing pad, stator, well head seal, valve plate, cable sheathing, wheel roller, in place gaskets or pipe seal.