High opacity paper containing expanded fiber and mineral pigment
US4952278A · kind A · utility
111Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 2, 1989 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Jun 2, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/67
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A paper structure having both high opacity and improved tensile strength through the incorporation of expanded fiber and an opacifying mineral pigment, such as titanium dioxide, is disclosed. The addition of expanded fiber to the paper structure makes it possible to increase the opacity of the paper through the use of the conventional mineral pigments without adversely affecting the paper's tensile strength. These opacified paper structures are especially useful for producing high quality, strong, light weight printing and writing papers which require material pigments for enhanced opacity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.