The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 17, 2003
Filed:
Oct. 24, 1997
Ian Stuart Bleakley, St Austell, GB;
Jonathan Stuart Phipps, St Ewe, GB;
Paul A Rey, Moon Township, PA (US);
Jose M Rodriguez, Eatonton, GA (US);
Hannu Olavi Ensio Toivonen, Roswell, GA (US);
Imerys Minerals Limited, Cornwall, GB;
Abstract
A new composite material which is useful as a pigment in paper making or paper coating is produced by precipitating a white insoluble pigment compound, eg calcium carbonate, in an aqueous suspension containing a mixture of fine particulate material eg titanium dioxide particles and fibers, eg cellulosic fibers. These suspended solids in the mixture are derived from separate stocks and added together to produce the composite pigment material. The new material is a bonded matrix of the fibers and the white pigment compound having particles of the fine particulate material, eg TiO , dispersed and bonded within the matrix. The new material may exist in the form of particles in dry or wet form which may be further treated in a known way prior to use in paper making or paper coating. Use of the new material allows expensive fine particulate material such as TiO particles to be better retained in a paper making composition whilst at the same time avoiding the known problem of agglomeration or 'crowding' of the fine particles which is known to affect adversely the optical properties of the composition produced using the fine particles.