Polymer Dispersant Composition for Stable TiO2 White Paint

The patent introduces a specifically designed polymer dispersant as an intermediary substance between TiO2 pigment and resin binder. This dispersant contains hydrophobic segments that adsorb onto TiO2 particle surfaces and hydrophilic segments that interact with the resin matrix, creating a bridge that prevents aggregation while maintaining compatibility. The dispersant acts as a mediator that resolves the incompatibility between inorganic TiO2 and organic resin, enabling stable dispersion without sacrificing opacity.

The patent modifies the chemical and physical parameters of the dispersant system by using a copolymer with specific composition ratios (anhydride monomer 20-40%, vinyl monomer 60-80%), controlled molecular weight (5,000-50,000), and specific functional group content (carboxyl 0.1-5.0 mmol/g). These parameter optimizations ensure the dispersant has the right balance of adsorption capability and steric stabilization, preventing TiO2 aggregation while maintaining paint stability and resin compatibility.

The polymer dispersant serves as a mediator that maintains the uniform distribution of TiO2 particles throughout the paint matrix. By adsorbing onto TiO2 surfaces and extending into the continuous phase, the dispersant prevents particle aggregation and sedimentation, thereby maintaining consistent tinting ability and color strength over time while improving overall paint reliability and storage stability.

The patent creates a composite dispersant system combining multiple functional segments: anhydride-derived polar groups for strong TiO2 surface interaction, vinyl-derived hydrocarbon chains for steric stabilization, and grafted polylactone segments for enhanced compatibility. This composite molecular structure provides multifunctional protection against aggregation and precipitation, ensuring both high tinting ability and long-term paint property stability.