Eastman CAB-500-5 is a high butyryl cellulose ester with one of the lowest hydroxyl contents of all Eastman cellulose acetate butyrate esters.
As might be expected from the high butyryl content,CAB-500-5 offers a wide range of solubility and compatibility.It produces a relatively soft,flexible film requiring little or no plasticizer in many applications.Like other cellulose acetate butyrate types,CAB-500-5 exhibits desirable film properties such as low color,good resistance to weathering,and color stability under exposure to ultraviolet light.
CAB-500-5 is used as a filmformer and additive in applications including hot-melt strippable coatings and lacquers for paper,plastic,and leather.It is also useful in inks and as a flowcontrol additive in polyurethane and polyester coatings.Because of the low hydroxyl and high butyryl content,CAB-500-5 can be formulated into emulsion coatings for leather for improvement of "hand"or the natural feel of the leather.
CAB-500-5 is supplied as a dry,free-flowing powder. | Table 1 | | Typical Propertiesa |
| Butyryl content,avg.wt% | 51.0 | | Acetyl content,avg.wt% | 4.0 | | Hydroxyl content,avg.wt% | 1.0 | | Viscosity,sb | 5.0 | | Viscosity,pb | 19.0 | | Color,ppmc | 125 | | Haze,ppmc | 25 | | Free acidity,as acetic acid,wt% | 0.03 | | Ash,% | 0.05 | | Refractive index | 1.475 | | Heat test(160oC for 8 h) | Tan melt | | Melting range | 165-175(329-347) | | Specific gravity | 1.18 | | Weight/volume(cast film) | | | Kg/L | 1.18 | | lb/gal(U.S.) | 9.83 | | Bulk density,as poured | | | kg/m3 | 400 | | lb/ft3 | 25 | | Bulk density,tapped | | | kg/m3 | 512 | | lb/ft3 | 32 | | Dielectric strength | | | kV/mil | 2.0-2.5 | | kV/cm | 787-984 | | Glass transition temperature,oC(oF) | 96(205) | | Molecular weight,Mnd | 57,000 |
a Properties reported here are typical of average lots.Eastman makes no represenation that the material in any particular shipment will conform to the listed properties.
b Viscosity determind by ASTM Method D 1343 in the solution described as Formula A, ASTM Method D 817. Viscosities in poises converted to ASTM seconds equivalent to values obtained under ASTM Method D 817.
c Determination of color made on a solution of the ester dissolved in MIBK using Pt-Co color standards.Haze is based on scattered light from a monodispersed polystyrene latex suspension haze standard.
d Polystyrene-equivalent number average molecular weight determined by gel permeation chromatography. |
