Today in food packaging industry, polymer composites are extensively exploited to produce cohesive peelable sealants for easy to open packages. Using nanoparticles for easy opening packaging is a quite new topic and very few studies have been conducted on this issue. Due to the layered structure and high aspect ratio, nanoclays show considerable effects on the rheological, thermal, mechanical and barrier properties of homopolymers. In this study, nanocomposites of low density polyethylene (LDPE) and different kinds of nanoclay in term of surface modification with 6 weight % of nanoclay were produced with twin screw extruder and then were filmed. The films were sealed using a heat sealer machine and then the peel behavior of the heat sealed samples were analysed using a tensile tester machine. X-Ray diffraction (XRD) was run on the films to study the level of dispersion of the nanoclay in the nanocomposites. Differential scanning calorimetry (DSC) was used to study the effect of nanoparticles on the melt temperature and crystallinity of the films and consequently on their seal and peel behavior. According to the results, heat seal initiation temperature of all the nanocomposite sealants reduced by incorporation of nanoclay in seal area compared to pure LDPE sealant. The nanocomposite made of non-modified nanoclay Na+ showed tactoid dispersion and its peel behaviour is similar to the sealant made with pure LDPE. Surface modified nanoclay with higher initial d-spacing resulted in better dispersion and consequently lower peel force as well as broader peelable heat seal temperature window. It is concluded that the seal and peel behavior of the nanocomposite sealants significantly are affected by dispersion and distribution of the nanoparticles in polymer matrix.