White coated sheet material useful for offset printing has a coating comprising a white pigment, a binder, an optical brightener and a support for the optical brightener

摘要

White coated sheet material comprises a base sheet and a printable surface layer comprising a white pigment, a binder, an optical brightener and a support for the optical brightener. The optical brightener is present in an amount of at least 1% by weight of pigment and the support is present in an amount of more than 2% by weight of pigment. Producing coated sheet material as above by applying an aqueous pigment composition by curtain coating.