CAB-381-20 is a high molecular weight cellulose acetate butyrate (CAB) polymer. It is used as a film former and additive in solvent-based coatings.
Product Overview
CAB-381-20 is a mixed cellulose ester with moderate butyryl content and high viscosity. It is commonly used as a film former or as an additive in solvent-borne coatings to improve leveling, gloss, UV resistance, and durability. CAB-381-20 is soluble in a wide range of common organic solvents and is compatible with most common resins and plasticizers. CAB-381-20 is the ideal film former for applications that require enhanced appearance and reliable performance like automotive coatings, wood coatings, and lacquers. CAB-381-20 is also commonly used in nail polish as it provides superior stability when compared to other film formers like nitrocellulose. When CAB-381-20 is used as a film former in nail polish formulations it allows for faster drying and fewer applications that similar formulations with nitrocellulose. In addition, a cost savings can be realized by using CAB-381-20 in nail polish as the same durability seen with a lower molecular weight polymer can be achieved at a lower addition rate.
Product Specifications
Viscosity ASTM-A, sec: 17 - 28
Acetyl by GC, wt%: 12 - 15
Butyryl by GC, wt%: 35 - 39
Free acidity, ppm: 300 Max
Moisture, wt%: 3.0 Max
Hydroxyl, wt%: 1.4 - 2.2

Primary Chemistry: Cellulose Acetate Butyrate
Features & Benefits
Improve flow and leveling
Reduce cratering
Reduce dry time
Provide polishability
Improve sprayability
Pigment dispersion medium
Metallic pigment control
Redissolve resistance
Sag resistance
Enhanced color uniformity
Decreased sand scratch telegraphing
Intercoat adhesion
Problems Solved
Intercoat adhesion failure of multi-coat systems
Poor pigment dispersion that leads to low color strength
Damage to coatings caused by abrasion
Coating defects like orange peel and pin holes
Automotive Coatings; Textile Coatings; Lacquers; Nail Polish; Wood Coatings