Paper having improved print quality and method of making the same
AssigneeRohm and Haas Company
InventorsBarrett Richard Bobsein, James Tinney Brown, Zhenwen Fu, Janet Drobits Windisch
Life of this patent
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Abstract
A paper having an improved print quality comprises a paper substrate having a surface with a surface roughness of less than 6 microns and a surface gloss of 5-80% which surface has been coated with a light-weight, low solids content, top coat. The top coat may comprise (i) a rheology modifier/binder component and at least one pigment or (ii) at least one binder coated pigment. The top coat provides a significant improvement to the delta gloss of the so-treated paper.
Claims13
A paper having an improved print quality, comprising:
- (i) a paper substrate, said paper substrate having a front and a back, and a surface on at least one of said front and said back of said paper substrate, said surface having a surface roughness of less than 6 microns and a surface gloss of 5-80%;
- and
- (ii) a top coat disposed on said surface, said top coat comprising a rheology modifier/binder component and at least one pigment, said rheology modifier/binder component being present in an amount of 5-200 parts by weight for each 100 parts by weight of said at least one pigment, said at least one pigment having an average particle diameter of 200 to 2000 nm, said top coat being a partial mono-layer of particles of said at least one pigment or clusters of said particles of said at least one pigment;
- wherein said paper with the top coat has a sheet gloss value of 50% or less.
A process of making a paper having an improved print quality, comprising:
- (i) providing a paper substrate, said paper substrate having a front and a back, and a surface on at least one of said front and said back of said paper substrate, said surface having a surface roughness of less than 6 microns and a surface gloss of 5-80%;
- and
- (ii) applying an aqueous top coat over said surface, said aqueous top coat having a solids content of 1 to 40% by weight, said aqueous top coat composition comprising water, a rheology modifier/binder component and at least one pigment, said rheology modifier/binder component being present in an amount of 5-200 parts by weight for each 100 parts by weight of said at least one pigment, said at least one pigment having an average particle diameter of 200 to 2000 nm, said top coat being a partial mono-layer of particles of said at least one pigment or clusters of said particles of said at least one pigment;
- and
- (iii) drying said aqueous top coat
- wherein said paper with the top coat has a sheet gloss value of 50% or less.
Dependencies are inferred from the claim text.