Process for producing resin-extended isoprene rubber, rubber composition obtained by the process and pneumatic tire

摘要

The present invention relates to a process for producing a resin-extended isoprene rubber comprising (A) a rubber component containing a natural rubber and/or a synthetic isoprene rubber and (B) a thermoplastic resin, wherein a resin slurry liquid prepared by dispersing the component (B) described above in water is mixed with a latex of the rubber component (A) described above, and then the mixture is coagulated and subjected to drying treatment, a rubber composition containing the resin-extended isoprene rubber obtained by the above process and a pneumatic tire prepared by using the above rubber composition for a member for a tread, and provided are a process for producing a resin-extended isoprene rubber in which a natural rubber and/or a synthetic isoprene rubber and a resin are used and in which the above resin is highly dispersed, a rubber composition which contains the resin-extended isoprene rubber obtained by the above process and which can secure a fracture characteristic and the like and a pneumatic tire prepared by using the above rubber composition.

主权项

1. A process for producing a resin-extended isoprene rubber comprising (A) a rubber component containing a natural rubber and/or a synthetic isoprene rubber and (B) a thermoplastic resin, wherein a resin slurry liquid prepared by dispersing the component (B) in water is mixed with a latex of the rubber component (A), and then the mixture is coagulated and subjected to drying treatment,
wherein the thermoplastic resin of the component (B) is at least one selected from C5 based resins, C5 to C9 based resins, terpene based resins and terpene-aromatic compound based resins, and wherein the thermoplastic resin of the component (B) has a haze value of 34% or less which is measured by the following method and which shows a compatibility with the component (A):
A solution prepared by dissolving 3 g of a synthetic isoprene rubber and 1.125 g of the thermoplastic resin of the sample in 50 mL of tetrahydrofuran at a temperature of 25° C. is subjected to cast molding to obtain a film having a thickness of 600 μm, and a haze value thereof is measured based on JIS K 6714.