Blend compositions of sulfo EPDM's having improved compression set properties

摘要

This invention relates to extrusion and injection moldable type elastomeric compositions having improved compression set properties and having a viscosity at 200° C. at 0.73 sec.sup.-1 of about 8× 10.sup.3 to about 8×10.sup.5 poises. The compositions used for elastomeric articles include a major portion of neutralized sulfonated EPDM terpolymer and a minor portion of an unsulfonated EPDM terpolymer or EP copolymer and optionally less than about 150 parts by weight of a non- polar process oil per 100 parts of the sulfonated polymer; less than about 300 parts by weight of a filler per 100 parts of the sulfonated polymer; and a preferential plasticizer at about 1 to about 60 parts by weight per 100 parts of the sulfonated elastomeric polymer.P PThese blend compositions can be readily processed due to their superior rheological properties on conventional plastic fabrication equipment into elastomeric articles having improved compression set properties characteristics.