A method for producing a thermoplastic elastomer composition comprising using a twin screw kneader to melt-knead a thermoplastic resin and an elastomer; the twin screw kneader having at least two raw material inlets including a first raw material inlet and a second raw material inlet provided at a position separated by 15D to 38D on a downstream side from the first raw material inlet, where D is a cylinder inside diameter of the twin screw kneader; the elastomer being fed in a divided manner from the first and second raw material inlets; a proportion of the elastomer fed from the second raw material inlet being from 10 to 60 vol % of a total amount of the elastomer; and the elastomer being melt-kneaded in a kneading zone having a length of from 0.5D to 20D in a cylinder axis direction of the twin screw kneader.

An ethylene-vinyl alcohol copolymer resin composition containing an ethylene-vinyl alcohol copolymer and a metal compound satisfying the following general formula (1), as an ethylene-vinyl alcohol copolymer resin composition having an excellent gas barrier property in the high humidity environment, particularly an excellent oxygen barrier property in the high humidity environment:
M.sub.a(OH).sub.bA.sup.n.sub.(2a-b)/n(1)
wherein M is a metal species, A is an anionic ligand having a valence of n and excluding a hydroxy ligand and O (oxo ligand), n is an integer not less than 1, and a and b are each a number greater than zero and satisfy an expression a/b=0.1 to 10.

Provided are a thermoplastic resin, a preparation method therefor, and use thereof, which belong to the field of optical resin. The thermoplastic resin is prepared from raw materials including at least one of a carbonic acid diester compound or a dicarboxylic acid compound and a dihydroxy compound. By making the content of specific triptycene framework compounds in the raw materials lower than a certain specific value, a thermoplastic resin with excellent optical performance, low fluidity and yellowness is prepared.