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Optical Brightening Agent

Optical whiteners function by absorbing ultraviolet radiation and re-emitting blue light. These additives are often used to enhance the appearance of color of fabric and paper, causing a "whitening" effect, making materials look less yellow by increasing the overall amount of blue light reflected. Brighteners are used in many papers, especially high brightness papers (internal or in a coating), resulting in their strongly fluorescent appearance under UV illumination Paper brightening.

Optical Brightening Agent

Titanium dioxide

It is intensely white permanent pigment used in paints, paper, toothpaste, and plastics. It is also used in cement, in gemstones, as an optical opacifier in paper, and a strengthening agent in graphite composite fishing rods and golf clubs. There are several grades of Titanium Dioxide, both Anatase and Rutile usually available in dry powder form. Anatase is an excellent choice for filling of paper. Rutile provides superior "wet" opacity, which is useful in wet strength paper grades, waxed papers, and other saturated applications. It is slightly more efficient than Anatase with a refractive index of 2.70, but it is more expensive. Both Rutile and Anatase provide excellent opacification (hiding power). They are used in manufacturing high and low pressure décor papers, decorative foils, and print-base applications.

Titanium dioxide

Borax

Borax is made from the natural mineral sodium borate, also called boric acid. It forms in white crystalline shapes. They are used in paper industry in making adhesives, in (corrugated) paper and paperboard products and in veneer sheets and pressed panels. In these uses, borates serve as multifunctional additives with binder/adhesive, flame retardant and fungicidal properties. They are also used as a pH buffer (stabilizer) in aminoplastic resins for wooden(medium density fibreboard and chipboard) panels production. In gypsum board manufacture, boric acid is widely used to increase the strength of the board (while reducing the board weight) and provide better adhesion of the paper to the board.

Borax
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