Modifiers for nitrile containing elastomers

• Main Authors: LIN CHON-YIE, HARRINGTON BRUCE A, DUNAWAY DAVID B
• Format: Patent
• Language: English
• Published: 05.03.2013
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

This invention relates to a polymer composition comprising: 70 wt % to 99.5 wt % of a nitrile-group containing elastomer, wherein the elastomer has: a Mooney Viscosity of 15 to 115 MU; and a nitrile monomer content of 0.5 wt % to 50 wt %; and 0.5 wt % to 30 wt % of a non-functionalized plasticizer (NFP), wherein the NFP has: a kinematic viscosity at 100° C. of 4 to 1000 cSt, a flash point of 200° C., a viscosity index of 120, and a specific gravity of 0.865; and wherein the composition has: a 25% compression set at 70 hours and −30° C. that is at least 110% of the 25% compression set of same composition without the NFP tested at the same conditions, and a retained tensile strength, in MPa, after 168 hours at 175° C., that is at least about 88% of the retained tensile strength of the same composition that has not been aged.