Resin Composition Low-Temperature Strength

The patent changes the particle size parameter of polyvinyl alcohol from conventional larger sizes to specifically 50-300 nm, and controls the dispersity to 3.0 or less. This parameter change enables the PVA particles to disperse uniformly in the starch matrix, forming effective physical crosslinks that enhance low-temperature breaking strength while preserving the gas barrier properties of the starch-PVA composition.

The patent creates a composite material system where nanoscale polyvinyl alcohol particles (50-300 nm) are dispersed within a starch matrix. This composite structure combines the biodegradability and gas barrier properties of starch with the strength-enhancing effect of fine PVA particles, achieving both improved breaking strength and maintained gas barrier performance.

The patent changes the particle size parameter of polyvinyl alcohol to 50-300 nm with dispersity of 3.0 or less. This fine particle size allows PVA to disperse uniformly throughout the starch matrix, creating numerous small physical crosslinking points that maintain chain mobility and enable elongation at low temperatures while preserving gas barrier properties.

The patent forms a composite material where nanoscale PVA particles (50-300 nm) are distributed within the starch matrix. This composite structure provides gas barrier performance from the starch-PVA combination while the fine particle dispersion maintains the material's ability to deform and elongate at low temperatures.

The patent specifies a particle diameter range of 50-300 nm with dispersity of 3.0 or less, which balances manufacturing feasibility with performance requirements. This parameter range is wide enough to accommodate normal manufacturing variations while being narrow enough to ensure uniform dispersion and consistent low-temperature strength performance.

The patent applies local quality control by specifying that polyvinyl alcohol particles should have diameters of 50-300 nm with dispersity of 3.0 or less. This localized control of particle size distribution in the critical dispersion region ensures uniform distribution throughout the starch matrix, achieving good low-temperature strength without requiring excessively tight manufacturing tolerances.