公开(公告)号：JPS6210148A

公开(公告)日：1987-01-19

申请号：JP14911285

申请日：1985-07-09

Applicant: BRIDGESTONE CORP

Inventor： KAWAMURA MASANORI ,  SATO SUSUMU ,  IKEGAMI MIKIHIKO ,  NODA AKIHIRO

IPC: B60C1/00 ,  C08K3/04 ,  C08L1/00 ,  C08L7/00 ,  C08L21/00 ,  C08L23/00 ,  C08L27/00 ,  C08L33/00 ,  C08L33/02 ,  C08L101/00

Abstract: PURPOSE:To provide a pneumatic tire having improved grip and tread abrasion resistance, by using a tread rubber made from a vulcanized rubber obtd. by blending carbon black with a styrene/butadiene copolymer rubber. CONSTITUTION:A pneumatic tire is obtd. by using a tread rubber made from a rubber compsn. obtd. by blending 50-250pts.wt. carbon black with 100pts.wt. raw rubber and vulcanizing the mixture. The raw rubber is a styrene/butadiene copolymer rubber having a styrene content of at least 25% alone or a blend rubber thereof with 5-80pts.wt. at least one rubber selected from among butyl rubber, halogenated butyl rubber and butadiene/acrylonitrile copolymer rubber. Said carbon black has a nitrogen adsorption surface area of 120-250m /g, compression dibutyl phthalate adsorption of 90-125ml/100g and coloring powder of 100-150. The granulated powder thereof has a hardness less than 9g and such a particle size distribution that at least 75% thereof is composed of particles having a particle size of 500mu or above.

公开(公告)号：JPH01103501A

公开(公告)日：1989-04-20

申请号：JP26105887

申请日：1987-10-16

Applicant: BRIDGESTONE CORP

Inventor： KAWAMURA MASANORI ,  NODA AKIHIRO

IPC: B60C11/00

Abstract: PURPOSE:To improve gripping ability and abrasion resistance of a tire by containing a specific amount of a specific rubber component, carbon black and petroleum-based softener in a foam rubber layer provided on the tread surface. CONSTITUTION:A high-performance pneumatic tire 1 has a foam rubber layer 10 at the surface side of a tread 3, and this layer 10 accounts for the volume of more than 10% of the tread 3. Foam rubber 11 constituting this foam rubber layer 10 contains a rubber component consisting of a polymer above a glass transition temperature of -60 deg.C, and carbon black is contained in a rubber component wt. part as much as about 130 weight, also containing aromatic oil or a petroleum softener as much as about 130 weight, and an ordinary compounding agent and a foaming agent are added. The rubber layer 10 has an independent bubble of 5-150mum in diameter and about 30% in its expansion ratio Vs, and has more than 20 pieces/mm of bubbles of 30-200mum in diameter. With this constitution, gripping ability and abrasion resistance are improved at the same time, and the extent of car's accelerability is thus improvable.

公开(公告)号：JPS61278549A

公开(公告)日：1986-12-09

申请号：JP11966685

申请日：1985-06-04

Applicant: BRIDGESTONE CORP

Inventor： KAWAMURA MASANORI ,  IKEGAMI MIKIHIKO ,  NODA AKIHIRO ,  KONDO HITOSHI ,  IWAFUNE SEIICHIRO

IPC: C08K3/04 ,  B60C1/00 ,  B60C11/00 ,  C08L7/00 ,  C08L21/00

Abstract: PURPOSE:To improve grip performance, etc. by forming a tread part with rubber obtd. by blending carbon black having specified properties and process oil with a rubber component mainly composed of a styrene/butadiene copolymer rubber having a high styrene content. CONSTITUTION:50-200pts.wt. higher reinforcing carbon black (A) having a nitrogen adsorption surface area of 90-250m /g and 5-200pts.wt. aromatic process oil (B) having a kinematic viscosity at 40 deg.C of 6,000cst or above and a ratio of te kinematic viscosity at 40 deg.C to that at 100 deg.C of 90 or above are blended with 100pts.wt. rubber component composed of 30-100pts.wt. styrene/ butadiene copolymer rubber having a high styrene content and optionally at least 5pts.wt. (halogenated) butyl rubber or butadiene/acrylonitrile copolymer rubber. A tread is prepd. from the rubber compsn. to provide the titled pneu matic tire.