Natural Rubber (NR) latex was deproteinized by incubation with urea in the presence of Sodium Dodecyl Sulfate (SDS). Deproteinized natural rubber (DPNR) latex was graft-compolymerized with methyl Methacrylate (MMA) at the variety of monomer feed and reaction temperature. The monomer conversion and grafting efficiency of the copolymerization reaction were determined. The resulting graft copolymers were characterized by NMR spectra and thermal stability assessed by DSC and TGA techniques. The result showed that MMA feed of 15 wt. % of rubber, initiator concentration of 6.6×10–5 mole/g-rubber and reaction temperature at 30 °C were found to be suitable conditions to obtain high conversion and grafting efficiency. The highest conversion and grafting efficiency were about 90 % and 68% at 15 wt. % on rubber feed of MMA, respectively.
