Optical Brightner
Optical brightening agents are additives which are used in the paper industries to enhance whitening effects of papers. These chemical compounds absorb light in the ultraviolet and violet region (usually 340-370nm) and re-emit light in the blue region (typically 420-470 nm). It gives a fluorescent effect that masks the inherent yellowness of the fiber and enhances the brightness of the paper product. They not only used in paper but also used in plastics, textiles, laundry detergents. They are also known as optical brighteners, artificial whiteners.
Polyvinyl Butrayl
The polyvinyl butyral is a hot-melt polymer compound in the form of white or yellowish powder particles. With high transparency, flexibility, high impact strength at low temperature, resistance to sun exposure, oxygen and ozone, wear resistance, resistance to inorganic acids and aliphatic hydrocarbons and other properties, and can and nitric acid fiber, phenolic, urea-formaldehyde, epoxy resins are mixed with the other phase to improve their performance. Soluble in alcohols, ethyl acetate, methyl ethyl ketone, cyclohexanone, methylene chloride and chloroform. It has good cold resistance and adhesion, and has good adhesion to metal, wood, ceramic, leather and fiber. Can be used for the intermediate layer and coating of safety glass.