Anti-blush and chemical resistant polyester film

Abstract

Embodiments herein relate to a polymer film comprising an anti-blushing composition in a blend comprising polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); wherein the blend has an intrinsic viscosity above 0.75 and contains at least 50 wt. % of PBT; wherein the anti-blushing composition comprises a phosphorus containing compound but excludes certain phosphorus compounds; and wherein the anti-blushing composition is configured to prevent blushing in the polymer film laminated directly to a metal sheet and exposed to steam at a temperature of 260° F. for 90 minutes.

What is claimed is: 
     
         1 . A polymer film comprising an anti-blushing composition in a blend comprising polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), wherein PBT is polymerized in presence of tetra-n-butyl titanate, tetraisopropyl titanate or combinations thereof;
 wherein the blend has an intrinsic viscosity above 0.75 and contains at least 50 wt. % of PBT; wherein the anti-blushing composition comprises a phosphorus containing compound;   wherein the anti-blushing composition excludes:   triphenyl phosphite,   bis(acetodeca)pentaerythritol diphosphite,   bis(2,6-di-t-butyl-4-methylphenyl)pentaerythritol dibenzophosphite,   bis(2,6-di-t-butyl-4-methylphenyl)pentaerythritol diphosphite, bis(2,4-dicumylphenyl)pentaerythritol diphosphite,   2-[[2,4,8,10-tetrakis(1,1-dimethylether)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl]oxy]-N,N-bis[2-[2,4,8,10-tetrakis(1,1-dimethylether)dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl)oxy]ethyl]ethanolamine,   diphenyl isodecylphosphite,   benzyl ethylphosphonate,   trimethyl phosphate,   triethyl phosphate,   tributyl phosphate,   ethyl diethylphosphonoacetate,   tri-2-ethylhexyl phosphate,   tris(2-chloroethyl)phosphate, and   bis(acetodeca)pentaerythritol diphosphite; and   wherein the anti-blushing composition is configured to prevent blushing in the polymer film laminated directly to a metal sheet and exposed to steam at a temperature of 260° F. for 90 minutes.