Rubber composition
AssigneeBridgestone Corporation
InventorsMasayuki Ohashi, Hiroshi Yamada, Tomohiro Kusano
Life of this patent
Estimating the term…
Abstract
A rubber composition contains 100 parts by weight of natural rubber and/or a diene type synthetic rubber and 20-70 parts by weight of carbon black having the following characteristics: (1) N.sub.2 SA: 70.about.145 m.sup.2 /gr; (2) DBP: 160.about.200 ml/100gr; (3) 24M4DBP: 130.about.150 ml/100gr; (4) DBP-24M4DBP=.DELTA.DBP.ltoreq.1.25.times.DBP-172.5; (5) N.sub.2 SA/IA: 1.1.about.1.4; and (6) .DELTA.D.sub.50 /dst: 0.50.about.0.80.
Claims10
A rubber composition which comprises 100 parts by weight of at least one rubber component selected from the group consisting of natural rubber and diene synthetic rubbers and 20-70 parts by weight of carbon black having the following characteristics:
- (1) a nitrogen adsorption specific surface area (N.sub.2 SA) of
- 70.about.145 m.sup.2 /g;
- (2) a dibutyl phthalate oil absorption amount (DBP) of
- 160.about.200 ml/100g;
- (3) a compressed dibutyl phthalate oil absorption amount (24M4DBP) of
- 130.about.150 ml/100g;
- (4) a .DELTA.DBP, which is represented by DBP-24M4DBP, satisfying the following Formula 1:
- .DELTA.DBP.ltoreq.(1.25.times.DBP)-172.5;
- (Formula 1)
- (5) a nitrogen adsorption specific surface area/iodine adsorption specific surface area of
- (N.sub.2 SA/IA) 1.1.about.1.4;
- and
- (6) a half width of aggregate distribution/most probable value of aggregate distribution of
- (.DELTA.D.sub.50/ dst) 0.50.about.0.80.
A tread for tire comprising,
- a rubber composition which comprises 100 parts by weight of at least one rubber component selected from the group consisting of natural rubber and diene synthetic rubbers and 20-70 parts by weight of carbon black having the following characteristics:
- (1) a nitrogen adsorption specific surface area (N.sub.2 SA) of
- 7.about. 145m.sup.2/ g;
- (2) a dibutyl phthalate oil absorption amount (DBP) of
- 160.about.200ml/100gr;
- (3) a compressed dibutyl phthalate oil absorption amount (24M4DBP) of
- 130.about.150 ml/100g;
- (4) a .DELTA.DBP, which is represented by DBP-24M4DBP, satisfying the following Formula 1:
- .DELTA.DBP.ltoreq.(1.25.times.DBP)-172.5;
- (Formula 1)
- (5) a nitrogen adsorption specific surface area/iodine adsorption specific surface area of (N.sub.2 SA/IA) 1.1.about.1.4;
- and
- (6) a half width of aggregate distribution/most probable value of aggregate distribution of (.DELTA.D.sub.50 /dst) 0.50.about.0.80.
Dependencies are inferred from the claim text.