▎ 摘　　要

NOVELTY - Nitrogen chain ends functionalized compounds (I), are new. USE - (I) are useful in additive composition and rubber composition to produce tire for truck and bus radial (TBR) tire tread (all claimed). ADVANTAGE - The composition introduces carbon black-friendly functional group to both ends of the chain to control hysteresis caused by chain ends of existing liquid butadiene rubber, affects fuel consumption characteristics, can improve several performance, produces tire or tire tread having excellent migration resistance, dispersibility, wear resistance, and mechanical properties, improves interaction between filler and rubber, and can improve and prevent the deterioration of physical properties due to the change with time. DETAILED DESCRIPTION - Nitrogen chain ends functionalized compounds of formula (I), are new. A and A1=a single bond, 1-6C alkylene, 3-10C cycloalkylene, or 6-14C arylene; M=a polymeric chain containing monomers having vinyl groups; R1, R2, R3 and R4=H, halo or 1-4C alkyl; and a and b=1-9. INDEPENDENT CLAIMS are also included for: preparation of (I); additive composition comprising the nitrogen chain ends functionalized compounds (I); and rubber composition comprising rubber polymer, and the additive composition.