Delustrant Pigment
Crystalline inorganic pigments added to synthetic polymer melts reduce surface sheen and modify light transmittance in synthetic fibers. The anatase crystal form of titanium dioxide anatase serves as a primary delustrant in nylon and polyester filament extrusion. Fine sub-micron particles scatter incoming light, converting bright transparent synthetic filaments into semi-dull or fully dull yarns.
The chemical scope covers pure anatase crystalline TiO2 additives incorporated during polymerization, excluding rutile crystal structures used primarily in outdoor industrial coatings.
Optical Modification
Dispersion of fine pigment particles within molten polymer alters refractive index boundaries across the fibre diameter. Un-pigmented synthetic filaments reflect light like clear glass rods, producing unwanted high sheen in apparel fabrics. By adding controlled amounts of titanium dioxide anatase, yarn producers achieve predictable matte visual effects that mimic natural cotton or wool lustre.
Photolytic Behavior
Anatase crystals possess photocatalytic properties when exposed to ultraviolet radiation. Solar light absorption generates reactive oxygen species that slowly degrade adjacent polymer chains in synthetic fibres containing titanium dioxide anatase. Fibre producers apply inorganic silica or alumina surface coatings to anatase particles to suppress UV-induced polymer degradation while preserving optical delustering capability.
Concentration Specification
Fully dull yarn formulations require two percent titanium dioxide anatase by mass.
