CA-398-3

CA-398-3 is a low molecular weight cellulose acetate. It is used as a film former in coatings and as a membrane material for filtration membranes.
Product Overview
CA-398-3 is the lowest molecular weight cellulose acetate available from Eastman™. Coatings made from CA-398-3 have excellent heat resistance, chemical resistance, durability, UV stability, and will outperform coatings based on nitrocellulose. CA-398-3 can also be used in food contact applications as it is generally recognized as safe by the FDA. CA-398-3 can also be used to make filtration membranes. These membranes are well suited for applications with a high risk of fouling. Membranes composed of cellulose acetate make intimate contact with aqueous feed streams and reduce the risk of fouling. They are also resistant to chlorine allowing them to be cleaned without being degraded.
Cellulose Acetate, like CA-398-3, has a natural selectivity for CH4 and CO2. This is why spiral wound and hollow fiber membranes composed of cellulose acetate are ideal for natural gas filtration and sweetening. CA-398-3 is available as a free flowing powder and should be let down in solvent prior to addition to a formulation.
Product Specifications
ASTM-A viscosity, sec: 2.0 - 4.0
Acetyl by titration, wt%: 39.8 +/- 0.5
Moisture, wt%: 3.0 (max)
Primary Chemistry: Cellulose Acetate
Features & Benefits
Chemical resistant
Provides high strength
Good weather-ability
Non-yellowing
Good flow and leveling
Pigment dispersion medium
Provides metallic pigment control
Redissolve resistance
Intercoat adhesion
Problems Solved
Poor chemical resistance of lacquers and coatings
Discoloration of coatings caused by UV and heat
Damage done to filtration membranes by strong oxidizing cleaning agents
Applications
Membrane material; Barrier Coatings; Packaging Films