Coated paper for printing

The use of calcium carbonate with specific particle sizes in the pigment coating layer addresses the affinity and strength challenges of coated papers, achieving high gloss and strength in coated printing paper.

JP2025169457APending Publication Date: 2025-11-12NIPPON PAPER IND CO LTD
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
JP2025143351
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2018-06-22
Filing Date
2025-08-29
Publication Date
2025-11-12

AI Technical Summary

Technical Problem

Existing coated papers face challenges in achieving high white paper gloss and strength due to the low affinity between acidic adhesives and basic flat pigments like kaolin or clay, leading to yellowish hue and reduced strength, while fine calcium carbonate increases binder requirements and decreases strength.

Method used

A coated printing paper with a pigment coating layer containing calcium carbonate with an average particle size of 0.50 μm to 0.80 μm, preferably 0.55 to 0.75 μm, and a specific ratio of calcium carbonate to adhesive, which enhances adhesion and reduces binder usage.

Benefits of technology

The solution results in coated printing paper with high white paper gloss and strength, maintaining print quality and reducing operational issues.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 2025169457000001
    Figure 2025169457000001
  • Figure 2025169457000002
    Figure 2025169457000002
  • Figure 2025169457000003
    Figure 2025169457000003
Patent Text Reader

Abstract

To provide coated paper for printing having high white-paper glossiness and high strength.SOLUTION: The base paper comprises a pigment coating layer on at least one surface. The outermost pigment coating layer contains calcium carbonate having an average particle size (D50) greater than 0.50 μm and 0.80 μm or less, and has a white-paper glossiness (75°) of 60% or more.SELECTED DRAWING: None
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Production of coated paper and coated paper produced by the production process

    JP1995229091A

  • Coated paper

    JP2007231457A