초록 ▼

This invention relates to injection moldable type elastomeric compositions having improved physical and rheological properties. The compositions used for elastomeric articles include a styrene-ethylene/butylene-styrene block copolymer or compounds thereof, a neutralized sulfonated EPDM terpolymer an

This invention relates to injection moldable type elastomeric compositions having improved physical and rheological properties. The compositions used for elastomeric articles include a styrene-ethylene/butylene-styrene block copolymer or compounds thereof, a neutralized sulfonated EPDM terpolymer and a non-polar process oil; and optionally a polypropylene thermoplastic resin. These blend compositions can be readily processed due to their superior rheological properties on conventional plastic fabrication equipment, especially on low pressure injection molding equipment into elastomeric articles having excellent physical properties and desirable rubbery characteristics.

대표청구항 ▼

An elastomeric composition which comprises (a) a styrene-ethylene/butylene-styrene block copolymer; (b) about 10 to about 400 parts by weight of a neutralized sulfonated EPDM terpolymer per 100 parts by weight of the styrene-ethylene/butylene-styrene block copolymer, said sulfonated EPDM terpolymer

An elastomeric composition which comprises (a) a styrene-ethylene/butylene-styrene block copolymer; (b) about 10 to about 400 parts by weight of a neutralized sulfonated EPDM terpolymer per 100 parts by weight of the styrene-ethylene/butylene-styrene block copolymer, said sulfonated EPDM terpolymer being derived from an EPDM terpolymer having an Mn of about 10,000 to about 200,000, a Mooney viscosity [ML, 1+8]212°F./and about 40 to about 75 wt. % of ethylene, of about 10 to about 53 wt. % of propylene and about 1 to about 10 wt. % of a conjugated diene; (c) about 5 to about 180 parts by weight of an isotactic polypropylene homopolymer per 100 parts by weight of the styrene-ethylene/butylene-styrene block copolymer; and (d) about 5 to about 300 parts by weight of a non-polar backbone process oil per 100 parts by weight of the styrene-ethylene/butylene-styrene block copolymer.