Pigment materials and their use in coating compositions
US6284034A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1999 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Jul 16, 2019 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H19/82
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A pigment material for use in a coating composition suitable for coating a sheet material to be printed by an electrophotographic printer which pigment material comprises a blend of Components A and B as follows: PA1 Component A: a fine pigment material suitable for gloss coating of a sheet material the pigment material comprising particles at least 80% by weight of which have an equivalent spherical diameter ("esd") of less than 2 .mu.m and having a particle size distribution ("psd") such that its d.sub.50 value, namely the particle esd value less than which 50% of the particles have an esd, is less than 1 .mu.m; and PA1 Component B: a coarse pigment material having a psd such that its d.sub.50 value is from 2 .mu.m to 10 .mu.m, desirably 2 .mu.m to 5 .mu.m and such that not more than 2% by weight of the particles of the coarse pigment material have an esd greater than 15 .mu.m, desirably not more than 2% have an esd greater than 10 .mu.m; wherein the weight ratio of Component A to Component B is at least 4:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.