Abstract: Authenticatable paper and paperboard products are prepared by printing images such as microdots on one or both surfaces of the paper using a starch containing authenticating solution. The images are not detectable by the human eye, but can be revealed with the application of a standard iodine solution.

Abstract: An authenticatable paper product is prepared by adding to a papermaking furnish fibers treated with from about 50-200 lb/ton of a fluorescent whitening agent (FWA). The paper made from the papermaking furnish will include fluorescent cellulosic fibers in an amount ranging from between 0.1-4.0 lb/ton to achieve FWA concentrations within the range of 1-20 ppm.

Abstract: An authenticable paper product is prepared from a bleached chemical papermaking furnish containing a minor but detectable amount of lignin containing fibers selected from the group consisting of mechanical, thermomechanical, chemi-thermomechanical and bleached-chemi-thermomechanical.

Abstract: A papermaking process with improved sizing efficiency and reduced size reversion is characterized by the use of a calcium carbonate pigment which is surface treated with an anionic starch-soap complex. The starch-soap complex is precipitated onto the pigment surfaces to provide bonding sites for sizing agents which impart water repellency to the paper. The sizing agents become bound to the starch component of the starch-soap complex to yield more reacted size in paper webs formed from the furnish than would be present without the use of the treated pigment. The use of the surface treated pigment also allows the papermaker to increase the filler content of the paper without sacrificing dry strength properties.

Abstract: A papermaking process with improved sizing efficiency and reduced size reversion is characterized by the use of a calcium carbonate pigment which is surface treated with an anionic starch-soap complex. The starch-soap complex is precipitated onto the pigment surfaces to provide bonding sites for sizing agents which impart water repellency to the paper. The sizing agents become bound to the starch component of the starch-soap complex to yield more reacted size in paper webs formed from the furnish than would be present without the use of the treated pigment. The use of the surface treated pigment also allows the papermaker to increase the filler content of the paper without sacrificing dry strength properties.

Abstract: A composite silicate pigment is prepared according to a precipitation reaction when spherical, hydrous metal silicate particles are precipitated on the planar surfaces of clay particles having a platelet-type structure. The result of the precipitation reaction is to a product having an unexpected improvement in optical efficiency as compared with the optical efficiency of the clay component alone. When incorporated in a sheet of paper or the like, the spherical metal silicate particles act as spacers between individual clay particles to produce void volume or light scattering sites which in turn provide improved optical properties to the paper.

Abstract: A composite silicate pigment is prepared according to a precipitation reaction when spherical, hydrous metal silicate particles are precipitated on the planar surfaces of clay particles having a platelet-type structure. The result of the precipitation reaction is to produce a product having an unexpected improvement in optical efficiency as compared with the optical efficiency of the clay component alone. When incorporated in a sheet of paper or the like, the spherical metal silicate particles act as spacers between individual clay particles to produce void volume or light scattering sites which in turn provide improved optical properties to the paper.

Abstract: A composite silicate pigment is prepared according to a precipitation reaction when spherical, hydrous metal silicate particles are precipitated on the planar surfaces of clay particles having a platelet-type structure. The result of the precipitation reaction is to produce a product having an unexpected improvement in optical efficiency as compared with the optical efficiency of the clay component alone. When incorporated in a sheet of paper or the like, the spherical metal silicate particles act as spacers between individual clay particles to produce void volume or light scattering sites which in turn provide improved optical properties to the paper.

Abstract: A blushed and opaque pigment consisting essentially of spherical particles having a high optical efficiency and an average particle diameter in the range of from about 0.1 to 0.2 micron is produced from a polystyrene containing latex emulsion. The blushed and opaque particles have an air containing microporous structure as a result of air-solid interfaces within the pigment particles, which interfaces are created when the particles are penetrated and swollen by a swelling agent for the particle material and then the swelling agent is removed to set the particles in their swollen and blushed state.