CAB-531-1 is a cellulose acetate butyrate (CAB) with high butyrate content. It is used as a film former in solvent-based coatings that require good flexibility.
Eastman CAB-531-1 is a low–molecular weight, mixed cellulose ester with high butyrate content. CAB-531-1 is the ideal resin for coatings that require best-in-class appearance and performance. Pigment orientation, flow, leveling, durability, and gloss are all improved with Eastman CAB-531-1. When combined with thermoplastic acrylic resins, this cellulose acetate butyrate forms durable films with excellent weathering resistance.
CAB-531-1 has better flexibility than lower-butyrate CABs and is compatible with a broader range of solvents and resins. Due to this increased flexibility, CAB-531-1 requires less plasticizer modification. As this cellulose acetate butyrate has a higher viscosity than other Eastman CABs, it is very effective in increasing cold-crack resistance. CAB-531-1 has also been used in nail care applications as a replacement for nitrocellulose due to superior UV stability and product safety since cellulose esters are much less flammable than nitrocellulose.
Viscosity (ASTM-A, sec): 1.3–2.6
Acetyl (by GC, wt%): 2–4
Butyryl (by GC, wt%): 48–52
Free acidity (ppm, max): 300
Moisture (wt%, max): 3.0
Hydroxyl (wt%): 1.1–2.1
Primary Chemistry: Cellulose acetate butyrate
Improves flow and leveling
Reduces cratering
Reduces dry time
Provides 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
Poor color strength and luster due to poor pigment dispersion
Sagging of solvent-based coatings
Long dry times of solvent-based coatings with good flow and leveling
High cost of plasticizers used in coatings
Use of flow and leveling agents made not using naturally derived materials
Insufficient viscosity build using low–molecular weight CABs
Safety issues using nitrocellulose
Automotive coatings
Nail care
Plastic coatings
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.
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