Antistatic thermoplastic polyester resin composition

Claim 1

An antistatic thermoplastic polyester resin composition comprising: (A) a thermoplastic polyester base resin which is normally susceptible to degradation by sulfonate-type antistatic agents; (B) an antistatic effective amount of between about 0.02 to about 10 wt.%, based on the total weight of the composition, of a sulfonate-type anionic antistatic agent which is selected from (i) alkali metal or alkaline earth metal aliphatic sulfonates in which the alkyl group has 1 to 35 carbon atoms, (ii) alkali metal or alkaline earth metal salts of sulfonic acids comprising 1 to 3 aromatic nuclei substituted with an alkyl group having 1 to 35 carbon atoms or (iii) metal alkyl-aromatic sulfonates; and (C) an amount effective to stabilize said thermoplastic polyester base resin against degradation by said sulfonate-type antistatic agent which is between about 0.005 to about 10 wt.%, based on the total weight of the composition, of one or more compounds selected from (C 1 ) organophosphorus compounds selected from triphenyl phosphite, tridecyl phosphite, diphenyl mono (2-ethylhexyl) phosphite, diphenyl isodecyl phosphite, phenyl diisodecyl phosphite and tris (nonylphenyl) phosphite and (C 2 ) organic chelating agents selected from ethylenediaminetetraacetic acid, cyclohexane- and diaminetetraacetic acid, ethylenediaminediacetic acid, nitrilotriacetic acid, hydroxyethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetramine-hexaccetic acid, hydroxyethyliminodiacetic acid, dihydroxyethylglycine, gluconic acid, tartaric acid and citric acid.