| abstract |
(57) [Problem] To provide a resin modifier capable of giving a resin composition having good low-temperature impact resistance and gloss and having a high balance. SOLUTION: A unit derived from a conjugated diene having a cis bond in all units derived from a conjugated diene is 40% or more, a weight average molecular weight (Mw) is 20,000 to 10,000,000, a weight average molecular weight (Mw) and a number. Average molecular weight (Mn) ratio (M w / Mn) and Mw: log (Mw / Mn) <0.162 × log (Mw) − 0.682, a resin modifier comprising a conjugated diene homopolymer or copolymer. |