What Is Latex and Acrylic Paint
Latex paint is the most widely used interior wall coating in North America and much of the world. Despite the name, modern latex paint contains no natural rubber latex. The term refers to a water-based emulsion where synthetic polymer particles are dispersed in water. When the water evaporates, the polymer particles coalesce into a continuous, durable film.
True acrylic paint uses 100 percent acrylic polymer as its binder. Many paints labeled "acrylic latex" use a blend of acrylic and vinyl acrylic or styrene acrylic polymers. Pure acrylic binders offer superior adhesion, flexibility, and resistance to UV degradation compared to vinyl acrylic blends. For this reason, 100 percent acrylic formulations dominate the premium and exterior paint markets.
The global architectural coatings market was valued at approximately 77 billion USD in 2023, with water-based paints accounting for over 65 percent of volume due to environmental regulations and consumer preference for low-odor products.
Key Components of Water-Based Paint
A typical latex paint contains four essential components. The binder, or resin, is the film-forming ingredient that holds everything together. Titanium dioxide, chemical formula TiO2, is the primary white pigment responsible for hiding power and opacity. Water serves as the carrier that evaporates during drying. Additives include thickeners, defoamers, biocides, and coalescing solvents.
TiO2 is manufactured primarily through the chloride process or sulfate process. It has a refractive index of approximately 2.7, which is significantly higher than most other white pigments. This high refractive index gives TiO2 its exceptional ability to scatter light and hide the substrate beneath. A premium interior paint may contain 15 to 25 percent TiO2 by weight.
Extender pigments like calcium carbonate, talc, and clay are added to control gloss, improve sanding properties, and reduce cost. These fillers have refractive indices close to that of the binder, so they contribute little to hiding power but play an important role in rheology and film structure.
Sheen Levels and Their Applications
Paint sheen, measured as specular gloss at 60 degrees, ranges from completely flat to high gloss. The industry recognizes five standard sheen levels.
Flat or matte finishes reflect less than 5 percent of light at 85 degrees. They hide wall imperfections effectively and are ideal for ceilings and low-traffic rooms like adult bedrooms. However, flat paints are difficult to clean and can burnish if scrubbed.
Eggshell finishes have a subtle velvety luster, reflecting about 10 to 25 percent of light. They offer a balance between appearance and washability, making them suitable for living rooms and dining rooms.