Lightweight coated printing paper for industrial inkjet printing press

Patent metadata

Field	Value
Publication number	US-9840103-B2
Application number	US-201515118141-A
Country	US
Kind code	B2
Filing date	Jan 22, 2015
Priority date	Feb 12, 2014
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

The present invention provides a lightweight coated printing paper for an industrial inkjet printing press, having a base paper, and one or more coating layers being disposed on at least one surface of the base paper and containing a pigment and a binder, wherein
the total coating weight of the coating layer(s) is 6 g/m 2 or less per one surface,
the at least one of the pigment in the coating layer(s) is ground calcium carbonate having an average particle diameter of 0.50 to 1.00 μm, wherein the amount of the ground calcium carbonate contained in the coating layer(s) is 50 parts by mass or more, relative to 100 parts by mass of the total of the pigment in the coating layer(s),
the lightweight coated printing paper has an opacity of 92.0% or more, a Stöckigt sizing degree of 1.0 to 8.0 seconds, and a 10-second Cobb sizing degree of 30 to 80 g/m 2 , wherein the ratio of the 10-second Cobb sizing degree to the Stöckigt sizing degree is 10.0 to 40.0.

First claim

The invention claimed is:

1. A lightweight coated printing paper for an industrial inkjet printing press, having a base paper, and one or more coating layers being disposed on at least one surface of the base paper and containing a pigment and a binder, wherein
the total coating weight of the coating layer(s) is 6 g/m 2 or less per one surface,
at least one of the pigment in the coating layer(s) is ground calcium carbonate having an average particle diameter of 0.50 to 1.00 μm, wherein the amount of the ground calcium carbonate contained in the coating layer(s) is 50 parts by mass or more, relative to 100 parts by mass of the total of the pigment in the coating layer(s),
the coating layer(s) contains at least one component selected from the group consisting of a cationic resin and a water-soluble multivalent cation salt, wherein the total content of the compound in the coating layer(s), in terms of a dry solids content, is 0.10 to 1.00 g/m 2 per one surface,
the lightweight coated printing paper has an opacity of 92.0% or more as measured in accordance with JIS P 8149, a Stöckigt sizing degree of 1.0 to 8.0 seconds as measured in accordance with JIS P 8122, and a 10-second Cobb sizing degree of 30 to 80 g/m 2 as measured in accordance with JIS P 8140, wherein the ratio of the 10-second Cobb sizing degree to the Stöckigt sizing degree is 10.0 to 40.0.

2. The lightweight coated printing paper for an industrial inkjet printing press according to claim 1 , which has a basis weight of 45 to 75 g/m 2 .

Assignees

• Mitsubishi Paper Mills Ltd

Inventors

• Nagoshi Masanori

Classifications

• D21H19/44

  characterised by the other ingredients, e.g. the binder or dispersing agent · CPC title

• B41M5/5245

  characterised by the use of polymers containing cationic or anionic groups, e.g. mordants · CPC title

• B41M5/5236

  characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose · CPC title

• D21H21/52

  Additives of definite length or shape · CPC title

• B41M5/52

  Macromolecular coatings · CPC title