Paper coating pigments
US7758690B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2003 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | May 12, 2025 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/52
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A coating composition for paper and other substrates, particularly mechanical papers such as lightweight coated (LWC) paper, comprises an aqueous suspension of a particulate pigment together with a binder, wherein the particulate pigment comprises: (a) a first component which is a precipitated calcium carbonate consisting predominantly of aragonitic or rhombohedral particle shapes or of aragonitic and rhombohedral particle shapes in a weight ratio of between around 40:60 and about 60:40 (e.g. about 50:50) aragonitic:rhombohedral, and a second component which is a processed particulate hydrous kaolin clay having a shape factor greater than or equal to about 25 and a steepness greater than or equal to about 20; or (b) a first component which is a fine particulate calcium carbonate consisting predominantly of particles having a generally spherical particle shape, and a second component which is a processed particulate hydrous kaolin clay having a shape factor greater than or equal to about 45 and a mean equivalent particle diameter (d50) less than about 0.5 μm; or (c) a first component which is a precipitated calcium carbonate consisting predominantly of aragonitic and rhombohedral pa…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.