86results about How to "Improve performance on ice" patented technology

Provided is a tire using a rubber composition, in which: the rubber composition contains a rubber component and a filler; the rubber component contains (A) a modified conjugated diene polymer and (B) a modified conjugated diene-aromatic vinyl copolymer; a modifying agent used for each of the component (A) and the component (B) includes (C) a hydrocarbyloxysilane compound containing a nitrogen atom and a silicon atom or (D) a hydrocarbyloxysilane compound containing a silicon atom; a combination of an unmodified conjugated diene polymer and the modifying agent, and a combination of an unmodified conjugated diene-aromatic vinyl copolymer and the modifying agent include any one of the following items 1 to 3: 1: the conjugated diene polymer and the component (C), and the conjugated diene-aromatic vinyl copolymer and the component (D); 2: the conjugated diene polymer and the component (D), and the conjugated diene-aromatic vinyl copolymer and the component (C); and 3: the conjugated diene polymer and the component (C), and the conjugated diene-aromatic vinyl copolymer and the component (C); and the filler contains silica and carbon black at a mass ratio of 10:90 to 80:20, the tire having good low fuel consumption, good on-ice performance, good wet performance, and good dry performance.

A pneumatic tire achieving good on-ice performance and good wet performance at the same time is provided. A pair of first main grooves extending in the circumferential direction of the tire is provided in the center region of a tread. A pair of second main grooves extending in the circumferential direction of the tire is provided on both the outer sides of the pair of first main grooves. First luggrooves and second lug grooves are alternately arranged in the circumferential direction of the tire such that the first lug grooves extend inward in the lateral direction of the tire from each shoulder end of the tread and communicate with the corresponding one of the first main grooves and further such that the second lug grooves extend inward in the lateral direction of the tire from the shoulder end of the tread and do not communicate with the corresponding one of the first main grooves. A center rib is arranged to extend between the pair of first main grooves. A shoulder block row composed of blocks is arranged between each second main groove and the corresponding one of the shoulder ends, and an intermediate shoulder block row composed of blocks is arranged between the second main groove and the adjacent one of the first main grooves. In the intermediate shoulder block row are arranged long blocks having a circumferential length equivalent to the length of two blocks of the shoulder block row.

Provide are a rubber composition which enhances a reinforcing property with a filler and maintains a DRY performance and which has an excellent on-ice performance and a pneumatic tire prepared by using the above rubber composition for a tread. The rubber composition is characterized by having independent air bubbles and comprising (A) a rubber component comprising a natural rubber and an end-modified conjugated diene base polymer, (B) a fine particle-containing organic fiber and (C) a filler.

The present invention provides a pneumatic tire capable of improving the drainage performance, on-snow performance, and on-ice performance while maintaining the steering stability on a dry road surface. The pneumatic tire (1) has a designated mounting orientation with respect to a vehicle. A tread portion (2) divided into a center land portion (6), an outer middle land portion (7A), an inner middle land portion (7B), an outer shoulder land portion (8A), and an inner shoulder land portion (8B); the outer shoulder land portion (8A) enables outer shoulder blocks (22) which are sectioned by outer shoulder lateral grooves (5A) to be arranged circumferentially on the tire in a space manner; the inner shoulder land portion includes inner shoulder lateral grooves (26) having outer ends which are on the outside of the vehicle and form terminals in the land portion (8B), and inner shoulder auxiliary grooves (28); the inner middle land portion includes an inner middle sub-groove (18) which continuously extends in a circumferential direction and inner middle sipes (21) which extend between the inner middle sub-groove and the inner center longitudinal groove (3B).

The invention provides a pneumatic tire, which can greatly improve performance on snow and draining performance. A tire face part (2) of the pneumatic tire (10) is provided with a central main channel (3A), a pair of tire shoulder main channels (3B), and a pair of central auxiliary channels (4A), and thereby an external side central land part (5B) and a tire shoulder land part (5C) are formed. The channel width (W1a) of the central main channel (3A) is larger than the channel width (W1b) of the tire shoulder main channels (3B). A tire shoulder transverse channel (6C) is disposed at the tire shoulder land part (5C). The angle (Alpha 7) of the tire shoulder transverse channel (6C) is larger than the angle (Alpha 4) of an outer side central transverse channel (6B). An outer end (6Bo) by which the outer side central transverse channel (6B) is communicated with the tire shoulder main channels (3B) and an inner end (6Ci) by which the tire shoulder transverse channel (6C) is communicated with the tire shoulder main channels (3B) are oppositely disposed with the tire shoulder main channel (3B) being arranged therebetween.

In order to solve the various conventional problems described above, the present invention provides a tire which is excellent in a braking property and a drivability (WET performance) on a wet road surface and which sufficiently displays an edge effect or a spike effect and is excellent in an on-ice performance (surface braking and driving performance). Further, the present invention provides a tire which enhances a workability in a plant and in which micro drain ditches exhibiting a water film-removing performance are surely formed. A foamed rubber layer provided on a surface of the tire substantially brought into contact with a road surface contains at least one inorganic compound powder having a particle diameter of 10 μm or less in a range of 5 to 20 mass parts per 100 mass parts of a rubber component.

This pneumatic tire (1) is provided with at least four circumferential main grooves (21, 22) extending in a tire circumferential direction, and a plurality of land portions (31-33) formed by being demarcated by the circumferential main grooves (21, 22). The pneumatic tire is further provided with a first lug groove (41) penetrating the center land portion (31) in a tire width direction, a circumferential narrow groove (23) disposed in the shoulder land portion (33) and extending in the tire circumferential direction, a second lug groove (43) extending inward from the circumferential narrow groove (23) in the tire width direction and open to the outermost circumferential main groove (22), and a third lug groove (44) extending outward from the circumferential narrow groove (23) in the tire width direction, open to a tread end, and disposed to be positionally displaced from the second lug groove (43) in the tire circumferential direction. The first lug groove (41) has a bent shape and is open with a see-through structure to the right and left circumferential main grooves (21, 22) that demarcate the center land portion (31).

The present invention provides a pneumatic tire simultaneously achieving both enhanced on-ice performance and enhanced durability. The pneumatic tire, wherein sipes (6) extending in the width direction of the tire are arranged at intervals in the circumferential direction of the tire in shoulder blocks (5a) divided by longitudinal grooves (2) extending at least in the circumferential direction and by lateral grooves (3) extending in the width direction. Open sipes (6a) and closed sipes (6b) are alternately arranged, and the depth of the open sipes (6a) is less than the depth of the closed sipes (6b).

Provided are a pneumatic tire having extremely excellent on-ice performance, and a rubber composition for tire treads used to prepare the pneumatic tire. A rubber composition for tire treads, based on 100 parts by weight of diene rubber, the rubber composition contains 0.5 to 15 parts by weight of non- Metal fiber, 0.5-30 parts by weight of eggshell powder, and a pneumatic tire containing the rubber composition for tire tread.

The invention restrains uneven abrasion such as punching abrasion or heal and toe abrasion while exhibiting high performance on ice. A shoulder block Bo is provided with a vertical siping 5 in the circumferential direction of a tire, and a lateral siping in the axial direction of the tire, and the shoulder block Bo is divided into four sections: a first inner block piece Bli on one side in the circumferential direction of the tire and inside in the axial direction of the tire; a first outer block piece Blo on one side in the circumferential direction of the tire and outside in the axial direction of the tire; a second inner block piece B2i on the other side in the circumferential direction of the tire and inside in the axial direction of the tire; and a second outer block piece B2o on the other side in the circumferential direction of the tire and outside in the axial direction of the tire.

Use of polybutadiene containing specific syndiotactic poly(1,2-butadiene) in a tread rubber can improve wearing resistance without impairing chipping / cutting resistance. A rubber composition for treads is provided which contains a rubber ingredient containing 10-30 wt.% butadiene rubber which contains syndiotactic poly(1,2-butadiene) dispersed therein having an average primary-particle diameter of 100 nm or smaller.

This method for producing a vulcanized rubber composition comprises (a) a step for preparing a master batch including a butadiene rubber and silica, (b) a step for preparing a master batch including an isoprene-based rubber and silica, (c) a step for kneading the master batch of (a) and the master batch of (b), and (d) a step for vulcanizing the kneaded product obtained in (c), wherein: the obtained vulcanized rubber composition has a BR phase and an IR phase that are incompatible with one another, and includes a predetermined amount of a terpene-based resin; the abundance ratio alpha of silica in a predetermined BR phase is 0.3 <= alpha <= 0.7 (formula 1); and the proportion beta of the butadiene rubber is 0.4 <= beta <= 0.8 (formula 2). Accordingly, this method can improve on-ice performance, wet performance, and wear resistance in a balanced manner, and can provide: a vulcanized rubber composition that has excellent on-ice performance, wet performance, and wear resistance; and a studless tire using said vulcanized rubber composition as a constituent of a tread.

The invention provides a heavy duty pneumatic tire which can play excellent on-ice performance and the wear-resisting property. A tread portion 2 is divided into shoulder land regions 11 and middle land regions 10. The shoulder land regions 11 comprise shoulder pattern blocks 40. The middle land regions 10 comprise middle pattern blocks 16. At least one of the shoulder pattern blocks 40 and at least one of the middle pattern blocks 16 are each divided by two splitting sipes 25 into a central pattern block piece 30 and outside pattern block pieces 31 on both sides thereof. Each outside pattern block piece 31 of the middle pattern blocks 16 is provided with a closed sipe 33. Each outside pattern block piece 31 of the shoulder pattern blocks 40 is provided with an open sipe 45.

The purpose of the present invention is to provide a winter tire which has excellent on-ice performance, snow clogging resistance and snow adhesion resistance. The present invention relates to a winter tire having a tread which is formed from a rubber composition that contains, per 100 parts by mass of a rubber component containing a natural rubber, 2.5-30 parts by mass of a cyclopentadiene resinand 5-100 parts by mass of silica.

Provided is a pneumatic tire with which changes in the physical properties over time are suppressed and excellent performance on ice is maintained. An undertread is made of an undertread rubber composition obtained by blending Wu parts by mass (Wu is 0 or more) of a softening agent U comprising a plasticizer component into 100 parts by mass of a rubber component. A cap tread is made of a cap tread rubber composition obtained by blending, into 100 parts by mass of a diene-based rubber comprising 30% by mass of polybutadiene, the following: at least 30 parts by mass of silica; and Wc parts by mass (Wc is from 20 to 70) of a softening agent C comprising 5 to 30 parts by mass of a resin component having a softening point of 90 to 150DEG C and a plasticizer component. The cap tread rubber composition is such that the mass ratio of the resin component in the softening agent C is 0.1 to 0.5 and the rubber hardness measured at 20DEG C with JIS K6253 Type A is 60 or less. The difference (Wc-Wu) in the blending amounts of the softening agent C and the softening agent U is from 20 to 60 parts by mass.

The rubber composition of the present invention comprises 100 parts by mass of a rubber component (A) comprising 45-75 mass% natural rubber and 25-55 mass% one or more conjugated-diene-based polymersin which the conjugated-diene compound moieties have a combined styrene content of 25% or less, 1-40 parts by mass of an unmodified conjugated-diene-based polymer (B) which has a weight-average molecular weight of 5,000 or higher but less than 40,000 in terms of polystyrene as determined by GPC and in which the conjugated-diene compound moieties have a combined styrene content less than 10% and acombined vinyl content of 20% or higher, and a filler (C), wherein at least one of the conjugated-diene-based polymers contained in the rubber component (A) is a modified conjugated-diene-based polymer. The rubber composition gives tires having further improved on-ice performance and combining excellent on-ice performance with excellent wear resistance.

A pneumatic tire has a tread surface for simultaneously achieving both enhanced on-ice performance and enhanced durability. The pneumatic tire includes sipes extending in the width direction of the tire that are arranged at intervals in the circumferential direction of the tire at least in shoulder blocks that are divided by longitudinal grooves extending in the circumferential direction of the tire and by lateral grooves extending in the width direction of the tire. Open sipes and closed sipes are alternately arranged, and the depth of the open sipes is less than the depth of the closed sipes.

In order to solve the various conventional problems described above, the present invention provides a tire which is excellent in a braking property and a drivability (WET performance) on a wet road surface and which sufficiently displays an edge effect or a spike effect and is excellent in an on-ice performance (surface braking and driving performance). Further, the present invention provides a tire which enhances a workability in a plant and in which micro drain ditches exhibiting a water film-removing performance are surely formed. A foamed rubber layer provided on a surface of the tire substantially brought into contact with a road surface contains at least one inorganic compound powder having a particle diameter of 10 μm or less in a range of 5 to 20 mass parts per 100 mass parts of a rubber component.