I am looking for silver nanoparticles based antimicrobial polyester masterbatch with the following specifications: 1. Antimicrobial polyester masterbatches (filament grade) (IV: 0.6 - 0.7 dl/g - preferably 0.68 dl/g) 2. Silver Particles Size: 80 -100 nm 3. Silver nanoparticles content (Parts per million (PPM)) : 4000