Master batch composition for a weight-reduced plastic product and method of manufacturing the same

A method of preparing a master batch composition for a weight-reduced plastic product, comprising:

• mixing a master batch composition to form a melt mixture in an internal mixer at a first temperature, wherein the master batch composition comprises a bi-component carrier resin, a core-shell foaming agent, and at least one lubricant, and the first temperature is a melting temperature of the bi-component carrier resin, wherein the core-shell foaming agent includes at least one outer polymeric shell and at least one inner foaming agent core, the polymeric outer polymeric shell encapsulates the inner foaming agent core, and the inner foaming agent core includes alkane;
• single-screw extruding and pelletizing the melt mixture at a second temperature ranging between 50 and 160° C. to form pellets;
• mixing the master batch composition in a form of pellets with a base plastic resin to form a molding mixture in an internal mixer, wherein the master batch composition has a particle size similar to that of the base plastic resin, thereby eliminating the need for additional foaming agents;
• single-screw extruding the molding mixture at a temperature ranging between 180 and 220° C. to form a product preform;
• and
• extrusion blow molding the product preform to form the weight-reduced plastic product, wherein the weight-reduced plastic product has a foaming pore size from 10 to 80 μm, and wherein the weight-reduced plastic product contains the master batch composition ranging from 1 to 10 wt %.