CAB-381-2

CAB-381-2 is a medium molecular weight mixed cellulose ester with moderate butyrate content. It is used as a film former, resin modifier, and additive in solvent-based inks and coatings.
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Product Overview
CAB-381-2 is a cellulose acetate butyrate (CAB) with moderate butyrate content and a higher than average molecular weight for the 381 series. The increased molecular weight of CAB-381-2 provides films with improved toughness over lower molecular weight CABs. CAB-381-2 is compatible with a broad range of solvents, resins, and plasticizers allowing formulators many options when optimizing a system. When used in coatings CAB-381-2 improves orientation of metallic pigments, increases gloss, increases UV stability, and decreases surface defects. As a binding resin in inks CAB-381-2 improves pigment dispersion, wetting, and UV stability. CAB-381-2 is also commonly used in nail care applications because it is more stable than other film-formers like nitrocellulose. When used as a film former in nail polish CAB-381-2 offers fast cure speed and excellent UV resistance. Nail polish formulations require fewer reapplications when utilizing CAB-381-2 as a film former.
Product Specifications
Viscosity ASTM-A, sec: 1.2 - 2.8
Acetyl by GC, wt%: 12 - 15
Butyryl by GC, wt%: 36 - 40
Free acidity, ppm: 300 Max
Moisture, wt%: 3.0 Max
Hydroxyl, wt%: 1.0 - 2.0
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
Poor durability of coatings and inks formulated with lower molecular weight polymers
Long dry times of solvent based coatings with formulated with slower solvents
Intercoat adhesion failure
Coating defects caused by leveling and flow issues
Applications
Automotive Coatings; Plastic Coatings; Printing Inks; Overprint Varnish; Nail Polish; Laquers; Wood Coatings; Paper Coatings; Textile Coatings