US 6,783,847 B1 · Offset printing paper

Abstract

To accommodate recent progress in printing technologies including conversion to offset printing, color printing, high-speed mass printing and automation of printing, by providing a coating layer containing an inorganic surface preparation agent mainly comprising silica sol and colloidal silica or a coating layer containing an inorganic surface preparation agent, to which an inorganic pigment, surface-sizing agent, inorganic salt and/or organic binder accordingly added in addition to silica sol or colloidal silica, offset paper serviceable for newsprint paper, which has improved qualities such as high whiteness, excellent water absorption resistance and ink acceptability, few adhesion troubles such as surface tack and curling caused by adhesion, and low chemical oxygen demand COD) load in wastewater when recycled, is provided.

Claims20

Dependent claims

Offset paper for offset printing comprising:

base paper for offset printing;
and
a coating layer provided on the base paper, said coating layer comprising (i) an inorganic surface preparation agent comprising silica sol or colloidal silica;
and (ii) a pigment consisting of an inorganic pigment, said inorganic surface preparation agent comprising an inorganic salt, wherein the inorganic salt is sodium sulfate or sodium nitrate.

1 more element

Dependencies are inferred from the claim text.

Offset printing paper

Life of this patent

Offset printing paper

Life of this patent

Abstract

Claims20