An organic filler, which is obtained by urea-formaldehyde condensation, has been used to light weight paper in recent years.
It improves brightness and opacity, in addition it has a very high absorptional ability of liquid owing to its porous structure.
A number of industrial benefits, which have not been achieved by common inorganic fillers, are obtained by its use.
These characteristics and paper making uses of its organic filler are discussed in this paper.
