Optical Brightener OB

C.I. Optical Brightener OB;184

Cas No. 7128-64-5

Other Name: Uvitex OB

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Specifications

Item	Indices
Appearance	light yellow or milk white powder
Purity	≥ 99.0 %
Melting point	201-202℃
Ash	Max20pm
Volatile content	0.2% max
Solubility	1g of OB can completely dissolved in 100ml of DMA (n,n-dimethylacetamide acid) , it gives clear and transparent solution.
Light transmittance	96% Min(450nm); 97% Min(500nm)

1. Applications:

Optical Brightener OB can be used for whitening thermoplastics, PVC, PS, PE, PP, ABS, acetate fibre, paint, coating, printing ink, etc. It can be added for whitening at any stage of process of polymers and can give the finished products a bright bluish white glaze.

2. Directions For Use And Dosage:

The dosage should be 0.01-0.05% on weight of plastic. Mix Optical brightener ob with plastic granulars thoroughly and carry out shaping proudction.

3.The adding methods of optical brighteners:

According to the different producing techniques of paints, there are two ways of adding optical brighteners:

(1) Optical brighteners OB are usually added in powder form during the grinding process (also the preparation process of paste) of paints production, then grinded together with paint vehicle. After fully grinded to microparticle with diameter ≤20μm, evenly disperse it into paints.

(2) After levigating optical brighteners OB, add it into paints by high-speed dispersion machine.

4.Optical brightener OB used for the whitening of white enamel

Prescription (mass fraction):

white enamel (polyurethane type or alcohol acid type): 99.9%

optical brightener OB: 0.02% ~ 0.05%

5.Packaging And Storing:

optical brightener OB is in 10Kg/25Kg/50Kg Carton Drums. Stored In Dry And Cool Condition.

Optical Brightener OB