1. A pneumatic tire provided with a tread pattern on which a plurality of blocks are formed with circumferential grooves which extend along a circumferential direction of the tire and lateral grooves which traverse the circumferential grooves,
wherein the lateral groove disposed between the blocks on the endmost tread edge region has a depth from 10 to 50% of a depth of the circumferential groove to be traversed and has a groove bottom concave portion whose both ends in a longitudinal direction are disposed inside the groove bottom, and a width of the groove bottom concave portion, which is determined on the basis of the bottom plane of the groove bottom, is from 25 to 45% of a groove width of the lateral groove.
2. The pneumatic tire according to claim 1, wherein a depth of the deepest part of the groove bottom concave portion is from 10 to 25% of the depth of the circumferential groove.
3. The pneumatic tire according to claim 1, wherein the block on the endmost tread edge region has a land portion sipe, which extends subparallel to the lateral groove disposed between the blocks and bends on the median side, and one end of the land portion sipe closes at a vicinity of the outer end of the block, while the other end thereof is open to the lateral groove.
4. The pneumatic tire according to claim 1, wherein the grooves in the circumferential direction of the tire are composed of three circumferential grooves, the lateral groove disposed between these circumferential grooves has a depth from 40 to 70% of a depth of the circumferential groove and has a groove bottom sipe on the groove bottom of the lateral groove, and both ends of the groove bottom sipe are open.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A substituted adamantane of Formula (I) or (II):
wherein
X represents a halogen atom;
Y is a C1-C10 alkyl group, a halogenated C1-C10 alkyl group, a halogen atom or a hetero atom-containing group;
R1 and R2 represents, independently, hydrogen, a halogen atom, a C1-C10 alkyl group or a halogenated C1-C10 alkyl group;
R3 and R4 represent, independently, hydrogen, a C1-C10 alkyl group, or a C1-C10 halogenated alkyl group,
wherein R3 and R4 cannot both be hydrogen in Formula (I);
wherein, in the formula (I), m represents an integer of 0 to 15, and n represents an integer of 1 to 10;
wherein, in the Formula (II), m represents an integer of 1 to 15.
2. A substituted adamantane selected from the group consisting of
wherein
X represents a halogen atom;
Y is a C1-C10 alkyl group, a halogenated C1-C10 alkyl group, a halogen atom or a hetero atom-containing group;
R1 and R2 represent, independently, hydrogen, a halogen atom, a C1-C10 alkyl group or a halogenated C1-C10 alkyl group;
R3 and R4 represent, independently, hydrogen, a C1-C10 alkyl group, or a C1-C10 halogenated alkyl group,
wherein R3 and R4 cannot both be hydrogen in Formulae (Ia-If);
wherein, in the formulae (Ia-If), m represents an integer of 0 to 13, and n represents an integer of 1 to 10;
wherein, in the Formula (IIa-IIe), m represents an integer of 1 to 13.
3. A process for producing the substituted adamantane of claim 1, comprising
reacting an alcohol comprising an adamantyl group represented by Formula (III) or (IV):
wherein in Formula (III), n represents an integer of 1 to 10;
with a carbonyl compound represented by Formula (V):
and at least one hydrogen halide gas; wherein R3 and R4 in Formula (V) are not both hydrogen when the carbonyl compound of formula (V) is reacted with the adamantyl group of Formula (III), and wherein m represents an integer of 1 to 13.