| abstract |
[Problem] To provide a polyester resin composition having good transparency, excellent mechanical strength, and less burden on the environment. SOLUTION: Polyester resins and fine cellulose fibers are hydrocarbon groups, preferably hydrocarbon groups having 1 carbon atom, or saturated or unsaturated, linear or branched hydrocarbon groups having 2 to 30 carbon atoms. A polyester resin composition comprising a fine cellulose fiber composite having an average fiber diameter of 0.1 to 200 nm, preferably 0.2 to 100 nm, wherein hydrocarbon groups are linked through amide bonds. [Selection figure] None |