FLUORESCENT WHITENING AGENT FOR PLASTICS

INTRODUCTION:

Optical whiteners function by absorbing ultraviolet radiation and re-emitting blue light.

The emitted blue light will reduce the yellowness of a polymer and provide the whiter-than-white appearance .

OPTICALWHITE PL is a heat resistant, solvent soluble, chemically stable fluorescent whitener that provides brighter looking colors . it is used to offset the yellowness of a polymer and yield a white appearance. Optical brighteners create brilliance by absorbing UV light, modifying the wavelength of the light and then emitting the light in a fluorescent fashion .

OPTICALWHITE PL can also be used as tracer in various applications and as an optical brightener in thermoplastics, coatings, printing inks, dyes, man-made fibers.

CHEMICAL NAME : 2,2'-(2,5-thiophenediyl)bis(5-tert-butylbenzoxazole)

EMPIRICAL FORMULA : C26H26N2O2S

CAS : 7128-64-5

PHYSICAL PROPERTIES :

Assay 99% Min	Ash 0.2% Max	Melting 195 - 208°C	Decomposition Temperature >350°C	Molecular weight 443 gm/ml	Appearance Yellowish, greenish crystalline powder
Vapor Pressure (20°c) 2.6 E-8 Pa	Specific Gravity (20°c) 1.26 g/cm³	500nm – 95%Min	% Transmittance 450nm – 93%Min	Solubility(1g/100ml Chloroform) Clear	Volatile Matter < 0.5% Max

SOLUBILITY :OPTICALWHITE PL

n-Hexane 00.20	Dioxane 02.00	Dimethylformamide 00.80	Chloroform 14.0	Acetone 0.50	at gms/100gms solution
Other organic solvents	Water 00.01	Xylene 05.00	Tricresylphophate 00.80	Methylketone 01.30	Methanol 00.10

APPLICATIONS :

Thermoplastics – OPTICALWHITE PL can be used to impart excellent brightness to various thermoplastics, including : polyvinyl chloride, polyethylene, polypropylene, cellulose acetate, polystyrene, polycarbonate, acrylics, polyolefin, adhesives, polyurethane, linear polyester, and polyamides .

Coatings – OPTICALWHITE PL provides on excellent means to determine coverage of either conventional or UV cure coatings. Small amounts act as a tracer which , when viewed under a black light, indicate whether or not uniform coating coverage has been achieved. This is especially useful for clear coatings where coverage can be difficult to determine by conventional means.

OPTICALWHITE PL can also be used to offset the yellowness of coatings to yield a whiter appearance .

Printing lnks – OPTICALWHITE PL may be used in printing inks to facilitate the quick identification of security bonds, and also as a safeguard against forgeries (bank notes).

OPTICALWHITE PL may also be combined with dyes to produce particularly bright shades.

The effect is especially pronounced in pastel shades.

Man-made fibers – OPTICALWHITE PL imparts a lightness with good textile fastness properties to both PVC and acetate fibers.

Main applications – Include fibers, molded articles, films, sheets, clear lacquers, paints, printing inks, and synthetic leather.

STORAGE :

OPTICALWHITE PL should be stored in a cool , dry area . Extended storage at elevated temperatures or exposure to direct heat or sunlight could reduce product life. Keep Container sealed when not in use .