CAB-381-0.5 is a mixed cellulose ester with low viscosity and medium butyryl content. It is used as a film-forming resin, a resin modifier, and an additive in solvent-based coatings and inks.
Eastman CAB-381-0.5 is a cellulose acetate butyrate (CAB) commonly used as a film-forming resin, resin modifier, and additive in many different coating and ink applications. It is supplied as a free-flowing powder. CAB-381-0.5 has a relatively low molecular weight compared to other Eastman CAB products and is, therefore, ideal for applications that demand low viscosity and high-solids content. It provides pigment dispersion, weathering resistance, and excellent control over color, flexibility, and flow. CAB-381-0.5 is compatible with many resins and is soluble in low-cost solvent systems.
CAB-381-0.5 improves wetting, UV stability, and drying times in inks and overprint varnishes. Improved metal flake orientation, resistance to redissolve from the topcoat solvents, and excellent sprayability are key benefits of cellulose acetate butyrate in coatings. CAB-381-0.5 is also commonly used in nail coatings to increase flexibility and improve UV resistance over other additives like nitrocellulose. It also is much safer to use than nitrocellulose because cellulose esters are much less flammable. Nail polish formulated with CAB-381-0.5 features fast cure speeds due to the fast solvent release of the film-forming polymer.
Viscosity (ASTM-A, sec): 0.33–0.55
Acetyl (by GC, wt%): 12–15
Butyryl (by GC, wt%): 36–40
Free acidity (ppm, max): 300
Moisture (wt%, max): 3.0
Hydroxyl (wt%): 1.0–2.0
Primary Chemistry: Cellulose acetate butyrate
Improves flow and leveling and decreases cratering
Reduces dry time
Provides easier polishability
Improves sprayability
Serves as a pigment-dispersion medium
Imparts metallic pigment control
Increases redissolve and sag resistance
Enhances color uniformity
Decreases sand scratch telegraphing
Facilitates intercoat adhesion
Low luster of automotive basecoats and topcoats due to poor metallic pigment flake orientation
Yellowing of nail polish and coatings formulated with nitrocellulose when exposed to heat and UV
Cratering and orange peel surface defects in solvent-based coatings
Damage done to coatings by scratching and abrasion
Poor flexibility and durability of coatings and inks
Use of leveling and flow control agents made not using naturally derived content
Safety issues using nitrocellulose
Automotive OEM coatings
Plastic coatings
Lacquers
Wood coatings
Gravure inks
Screen inks
Overprint varnish
Nail polish
Eastman Solus™ performance additives are the newest cellulose esters designed for high-solids solvent-borne systems. Solus™ is specifically engineered to meet lower VOC target while improving performance in clear, pigmented and metallic automotive coatings.
Eastman CAB enhances efficiencies and reduces waste through fewer rejects and reduced need for re-coating while substantially improving finished outcomes.
Eastman cellulose esters can be formulated into inks as the main film former, co-resin, or additive to improve appearance, performance, and productivity.
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