Rubber composition for tire tread and tire manufactured by using the same
Provided are a rubber composition for tire tread containing 100 parts by weight of raw material rubber, 10 parts to 100 parts by weight of a reinforcing filler, and 1 part to 20 parts by weight of a silane compound represented by the following formula (1), the raw material rubber containing 40 parts to 90 parts by weight of a styrene-butadiene rubber and 10 parts to 60 parts by weight of a butadiene rubber; and a tire produced using the rubber composition. The rubber composition for tire tread exhibit improved dispersibility, processability, mechanical characteristics, abrasion resistance performance, and rolling resistance characteristics. wherein X represents a vinyl group; Y represents an alkoxy group; Z represents an alkoxy group; a represents an integer from 0 to 6; b and c each independently represent an integer from 0 to 2 and do not necessarily represent 0 at the same time; and x represents an integer from 1 to 3.
1. A rubber composition for tire tread, comprising:
100 parts by weight of raw material rubber;
10 parts to 100 parts by weight of a reinforcing filler;
1 part to 10 parts by weight of zinc oxide;
1 part to 10 parts by weight of stearic acid; and
1 part to 20 parts by weight of a silane compound represented by the following formula (1),
wherein the raw material rubber comprises 40 parts to 90 parts by weight of a styrene-butadiene rubber, and 10 parts to 60 parts by weight of a butadiene rubber, and
wherein the styrene-butadiene rubber has a styrene content of 22% to 25% by weight, a vinyl content of 15% to 18% by weight, a number average molecular weight (Mn) of 55,000 to 59,000, a weight average molecular weight (Mw) of 260,000 to 320,000, and a molecular weight distribution (MWD) of 3.8 to 4.2:
wherein in the formula (1),
X represents a vinyl group;
Y represents a functional group represented by the following formula (2a);
Z represents a functional group represented by the following formula (2b):
(wherein d and e each independently represent an integer from 0 to 6);
a represents an integer from 0 to 6;
b and c each independently represent an integer from 0 to 2 and do not necessarily represent 0 at the same time; and
x represents an integer from 1 to 3.
2. The rubber composition for tire tread according to claim 1 , wherein the silane compound has a weight average molecular weight of 180 g/mol to 20,000 g/mol.
3. The rubber composition for tire tread according to claim 1 , wherein the silane compound is selected from the group consisting of vinyltris(2-methoxyethoxy)silane, triethoxyvinylsilane, and mixtures thereof.
4. The rubber composition for tire tread according to claim 1 , wherein the reinforcing filler is selected from the group consisting of a carbon black having a nitrogen adsorption specific surface area of 30 m 2 /g to 300 m 2 /g and an n-dibutyl phthalate (DBP) oil absorption of 60 cc/100 g to 180 cc/100 g; a silica having a nitrogen adsorption specific surface area of 100 m 2 /g to 180 m 2 /g and a cetyltrimethylammonium bromide (CTAB) adsorption specific surface area of 110 m 2 /g to 170 m 2 /g; and mixtures thereof.
5. The rubber composition for tire tread according to claim 1 , wherein the rubber composition for tire tread further comprises additives selected from the group consisting of 0.5 parts to 5 parts by weight of a vulcanizing agent; 0.1 parts to 10 parts by weight of a vulcanization accelerator; 1 part to 50 parts by weight of a softening agent; 0.1 parts to 10 parts by weight of an aging preventing agent; 0.5 parts to 10 parts by weight of an adhesive; and mixtures thereof, all relative to 100 parts by weight of the raw material rubber.
6. A tire produced using the rubber composition for tire tread according to claim 1 .
7. A tire produced using the rubber composition for tire tread according to claim 2 .