Extrudable Polymer Composition with Bicomponent Fibers

The patent applies composite materials by combining PLA with impact modifiers such as polypropylene-glycidyl methacrylate (PP-g-EMA), polyethylene-glycidyl methacrylate (PE-g-EMA), and ethylene-methyl acrylate (EMA) copolymer. These impact modifiers are blended with PLA at specific ratios (e.g., 90:10 to 99:1 by weight) to create a composite material that maintains the biodegradability and sustainability of PLA while significantly improving impact strength and toughness through the synergistic effects of the modifier components.

The patent applies parameter changes by modifying the thermal and rheological properties of PLA through blending with impact modifiers that have different melting points and flow characteristics. The addition of modifiers such as PP-g-EMA (melting point ~160°C) and PE-g-EMA (melting point ~60°C) to PLA (melting point ~160-180°C) creates a multi-phase system with broadened processing temperature window, improved melt flow, and enhanced heat resistance while maintaining biodegradability of the primary PLA matrix.

The patent applies the intermediary principle by using graft copolymers such as polypropylene-glycidyl methacrylate (PP-g-EMA) and polyethylene-glycidyl methacrylate (PE-g-EMA) as intermediary materials. These graft copolymers contain both the base polymer backbone (PP or PE) and functional groups (glycidyl methacrylate) that can interact with PLA through chemical or physical bonding. This intermediary structure facilitates compatibility between the hydrophobic PLA matrix and the impact modifier phases, improving dispersion and reducing phase separation while maintaining enhanced impact strength.