Modified natural rubber, rubber composition using it, and method for producing modified natural rubber.

摘要

Provided are a modified natural rubber having better fuel efficiency and tensile strength than the unmodified natural rubber, a rubber composition using the modified natural rubber, and a method for producing the modified natural rubber. A polyisoprene having a structure represented by the general formula (A) and / or the general formula (B) is bonded to an amino compound having two or more primary amino groups in these structural portions. A modified natural rubber having a connecting structure represented by (C). [Chemical formula 1] [Chemical formula 2] However, in the formulas (A) and (B), X represents a hydrogen atom or a methyl group, P represents a polyisoprene unit, and P in each formula may be the same or different. Good. [Chemical formula 3] In formula (C), W indicates a residue obtained by removing the terminal amino group from the above amino compound, and Q is selected from the group consisting of the following general formulas (Q-1) to (Q-4). At least one is shown, and m represents 2-4. Further, in the general formulas (Q-1) to (Q-4), * 1 indicates that the polyisoprene unit is bonded to the carbon atom, and * 2 is bonded to the carbon atom of the residue represented by W. Show that you are doing. [Chemical 4]