US Patent 7723418 Antistatic resin composition

An antistatic resin composition and molded products therefrom are described, having good antistatic effect and mechanical strength regardless the type of the molding method. The composition includes a thermoplastic resin (A) and an antistatic agent (B), wherein a refractive index difference between (A) and (B) is not more than 0.02. The antistatic agent (B) includes at least one material selected from the group consisting of (B1) and (B2). (B1) is a polyetheresteramide derived from a polyamide having a Mn of 200-5000 and an alkyleneoxide adduct of bisphenol having a Mn of 300-5000. (B2) is a block polymer having a structure such that blocks of a polyolefin and blocks of a hydrophilic polymer having an volume resistivity of 105-1011 Ω·cm are bonded together alternately and repeatedly via at least one bonding mode selected from the group consisting of ester bonding, amide bonding, ether bonding, imide bonding and urethane bonding.