5 Reasons Why Your Business Needs Optical Brightener OB-1？

                                                           OB                                                                                                                                                     OB-1

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2. Different melting points:
The melting point of Optical brightener OB is 200 ℃, which is lower than the melting point of Optical brightener OB-1 by 360 ℃ (OB-1 is the most heat-resistant whitening agent), which largely determines the application of the two Optical brighteners. Therefore, OB is not suitable for high-temperature products, and on the other hand, OB-1 can be used for materials that require high-temperature processing.

3. Dispersibility and stability : OB>OB-1
Here, it should be noted that good dispersibility means that the product is more easily soluble and uniform. For example, paint and ink require high dispersibility of Optical brighteners; Good stability refers to the fact that the product is less prone to migration and yellowing in the later stage. For example, some low-quality shoe soles may appear white and pure when first purchased, but soon turn yellow and discolor. This indicates that the stability of Optical brighteners is poor.
Dispersion mainly defines the stability of the application, and products with good dispersibility will have long-lasting whitening effects, and the yellowing of the product will be very slow. Optical brightener OB has better dispersibility and stability than OB-1, which is why it is recommended to use OB in ink coatings because OB is less prone to the yellowing phenomenon that may occur in the early stages of OB-1.
4. The price is the biggest difference between OB and OB-1
OB is much more expensive than OB-1, so customers who can use Optical brightenerOB-1 should try to choose OB-1. For customers with special requirements, such as high-end ink coatings and soft plastics, it is recommended to still use OB-1.

5. Usage:
OB:Soft plastic (PVC) , transparent plastic, film, paint and ink, food containers, children's toys
OB-1：Hard plastic, high temperature, fruit basket

Optical Brightener OB-1 for plastics

Plastic products are not unfamiliar to everyone and can be seen everywhere around us. Due to the wide range of use of plastic products, there are more and more plastic manufacturers, and the industry is doing more and more. Of course, the market demand is great, and the competition will be fierce. 

Everyone knows that the recyclability is relatively high. There are countless large and small plastic manufacturers in China, and most of them choose to recycle plastic for secondary processing. However, as people's living standards continue to improve, there will be relatively high requirements for the appearance and quality of products. Many plastic manufacturers will ask, do I need to add optical brightener to plastics? Is it okay to use titanium dioxide? Then we will talk about the Optical Brightener for plastics.

First of all, we need to understand the role of Optical Brightener and titanium dioxide. Although both are whitening substances, their principles are quite different. One of the biggest advantages of titanium dioxide is its low price. However, many manufacturers who have used titanium dioxide have found this problem. After adding a certain amount of titanium dioxide, the whiteness can no longer be improved. The effect of covering is like applying a thick layer of liquid foundation on a person's face, which gives people the impression of false white, unnatural, and the amount of addition will be very large. Many manufacturers give up after using the product because the appearance of the product is unnatural.

The plastic optical brightener is an optical effect. It has a special whitening effect that can whiten the slightly yellowish substrate without damaging the substrate. Its working principle is to absorb invisible light and emit visible light without any chemical reaction. It is not that the product turns white, but the complementary effect of different colors of light through ultraviolet light to form white light that we can see with the naked eye, which will increase the whiteness and brightness of the plastic product, so that it is whiter and whiter. The colorful ones are more colorful. 

Among all the optical brighteners for plastics, optical brightener OB-1 for plastics is the most popular in the market.

Product Name:Optical Brightener OB-1 for plastics

Chemical Name:2.2’-(4.4’-diphenol vinyl) dibenzoxazol

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CAS No.:-45-5

C.I. No.:393

Molecular Formula:C28H18N2O2

Molecular Weight:414 

Technical Index:Appearance:yellowish green powder 

Melting Point:357~359°C 

Purity:≥98.5% 

Recommend Dosage:200-500g per kg material

Package:10KG/25kg per fiber drum with 450kg or 500 kg or 675kg/pallet

Optical Brightener OB-1 produced from China only,but world wilde use it to make master batches,then the optical brightener masterbatches and compound are used in the plastics industry.

If you want to know more about Optical Brightener OB-1 ,pls contact Raytop Chemical sales team: or wechat/what'sapp