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A rubber composition having improved weather resistance, thermal resistance, resistance to crack growth and wear resistance comprises not less than 20 parts by weight of a rubber compound mainly of ethylene, propylene and diene and satisfying all of particular requirements. Further, the rubber compo

A rubber composition having improved weather resistance, thermal resistance, resistance to crack growth and wear resistance comprises not less than 20 parts by weight of a rubber compound mainly of ethylene, propylene and diene and satisfying all of particular requirements. Further, the rubber composition is applied to a tread and/or a sidewall of a pneumatic tire for improving a tire appearance.

대표청구항 ▼

A pneumatic tire comprising a tread, sidewalls and bead portions; said sidewall being constructed by using a rubber composition comprising not less than 20 parts by weight of a rubber consisting essentially of an interpolymer of ethylene, propylene and diene and satisfying all of the following requi

A pneumatic tire comprising a tread, sidewalls and bead portions; said sidewall being constructed by using a rubber composition comprising not less than 20 parts by weight of a rubber consisting essentially of an interpolymer of ethylene, propylene and diene and satisfying all of the following requirements: (1) a glass transition temperature of not higher than -50°C. as measured by a differential scanning calorimeter; (2) an iodine value of 10＿34; (3) a weight-average molecular weight of not less than 220,000; (4) an ethylene content of 68＿85 mol %; (5) a molecular weight distribution (w/n) of not less than 3.0; (6) 95≤1.5×(iodine value)+(ethylene content)≤120; and (7) 90≤(weight-average molecular weight)×10-4+(ethylene content)≤110 , not less than 10 parts by weight of an isoprene rubber, not less than 10 parts by weight of a process oil and 20＿100 parts by weight of an inorganic filler based on 100 parts by weight of rubber content. A pneumatic tire comprising a tread, sidewalls and bead portions; said tread being constructed by using a rubber composition comprising not less than 20 parts by weight of an interpolymer of a rubber composed mainly of ethylene, propylene and diene and satisfying all of the following requirements: (1) a glass transition temperature of not higher than -50°C. as measured by a differential scanning calorimeter; (2) an iodine value of 10＿34; (3) a weight-average molecular weight of not less than 220,000; (4) an ethylene content of 68＿85 mol %; (5) a molecular weight distribution (w/n) of not less than 3.0; (6) 95≤1.5×(iodine value)+(ethylene content)≤120; and (7) 90≤(weight-average molecular weight)×10-4+(ethylene content)≤110 , not less than 10 parts by weight of a process oil and 50＿150 parts by weight of an inorganic filler based on 100 parts by weight of rubber content.