Metal neutralized sulfonated EPDM terpolymers and compositions thereof

An elastomeric composition which consists essentially of:

• (a) a metal neutralized sulfonated EPDM terpolymer having at least about 65 wt. % ethylene in the backbone of said metal neutralized sulfonated EPDM terpolymer, about 10 to about 60 meq. of metal sulfonate groups per 100 grams of said metal neutralized sulfonated EPDM terpolymer, a metal of said metal sulfonate groups being selected from the group consisting of aluminum, iron, antimony, mercury and Groups IA, IIA and IB of the Periodic Table of Elements and mixtures thereof;
• (b) at least 8 parts by weight of a preferential plasticizer per 100 parts of said metal neutralized sulfonated EPDM terpolymer, said preferential plasticizer being selected from the group consisting of stearamides and zinc salts of carboxylic acids having about 12 to about 30 carbon atoms;
• and
• (c) about 20 to about 100 parts by weight of a crystalline polyolefin per 100 parts of said metal neutralized sulfonated EPDM terpolymer.

An elastomeric composition which consists essentially of:

• (a) a metal neutralized sulfonated EPDM terpolymer having at least about 65 wt. % ethylene in the backbone of said metal neutralized sulfonated EPDM terpolymer, about 10 to about 60 meq. of metal sulfonate groups per 100 grams of said metal neutralized sulfonated EPDM terpolymer, a metal of said metal sulfonate groups being selected from the group consisting of aluminum, iron, antimony, mercury and Groups IA, IIA and IB of the Periodic Table of Elements and mixtures thereof;
• (b) at least 8 parts by weight of a preferential plasticizer per 100 parts of said metal neutralized sulfonated EPDM terpolymer, said preferential plasticizer being selected from the group consisting of stearamides and zinc salts of carboxylic acids having about 12 to about 30 carbon atoms;
• (c) about 50 to about 300 parts by weight of an inorganic filler per 100 parts of said metal neutralized sulfonated EPDM terpolymer, said inorganic filler being selected from the group consisting of clay, talc and calcium carbonate and mixtures thereof;
• and
• (d) about 50 to about 100 parts by weight of a non-polar process oil having less than about 2 wt. % polar type compounds, said non-polar process oil being selected from the group consisting of paraffinics, naphthenics and aromatics and mixtures thereof.

A polymeric article formed by a low pressure injection molding process which consists essentially of:

• (a) a metal neutralized sulfonated EPDM terpolymer having at least about 65 wt. % ethylene in the backbone of said metal neutralized sulfonated EPDM terpolymer, about 10 to about 60 meq. of metal sulfonate groups per 100 grams of said metal neutralized sulfonated EPDM terpolymer, a metal of said metal sulfonate groups being selected from the group consisting of aluminum, iron, antimony, mercury and Groups IA, IIA and IB of the Periodic Table of Elements and mixtures thereof;
• (b) at least 8 parts by weight of a preferential plasticizer per 100 parts of said metal neutralized sulfonated EPDM terpolymer, said preferential plasticizer being selected from the group consisting of stearamides and zinc salts of carboxylic acids having about 12 to about 30 carbon atoms;
• and
• (c) about 20 to about 100 parts by weight of a crystalline polyolefin per 100 parts of said metal neutralized sulfonated EPDM terpolymer.

A polymeric article formed by a low pressure injection molding process which consists essentially of an elastomeric composition which consists essentially of:

• (a) a metal neutralized sulfonated EPDM terpolymer having at least about 65 wt. % ethylene in the backbone of said metal neutralized sulfonated EPDM terpolymer, about 10 to about 60 meq. of metal sulfonate groups per 100 grams of said metal neutralized sulfonated EPDM terpolymer, a metal of said metal sulfonate groups being selected from the group consisting of aluminum, iron, antimony, mercury and Groups IA, IIA and IB of the Periodic Table of Elements and mixtures thereof;
• (b) at least 8 parts by weight of a preferential plasticizer per 100 parts of said metal neutralized sulfonated EPDM terpolymer, said preferential plasticizer being selected from the group consisting of stearamides and zinc salts of carboxylic acids having about 12 to about 30 carbon atoms;
• (c) about 50 to about 300 parts by weight of an inorganic filler per 100 parts of said metal neutralized sulfonated EPDM terpolymer, said inorganic filler being selected from the group consisting of clay, talc and calcium carbonate and mixtures thereof;
• and
• (d) about 50 to about 100 parts by weight of a nonpolar process oil having less than about 2 wt. % polar type compounds, said non-polar process oil being selected from the group consisting of paraffinics, naphthenics and aromatics and mixtures thereof.