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. 08, 1999
Filed:
Jul. 31, 1997
Applicant:
Inventors:
Steven Hugh Ashdown, Darlington, GB;
Robert McIntyre, Durham, GB;
Neil Martin Richmond, Darlington, GB;
Assignee:
Tioxide Group Services Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09C / ; C09C / ;
U.S. Cl.
CPC ...
106436 ; 106438 ; 106439 ; 106442 ; 106443 ; 106445 ; 106446 ; 106447 ; 106448 ; 106449 ;
Abstract
A pigmentary material comprises particulate titanium dioxide the particles of which have been treated with a polymeric hindered amine stabiliser. The stabiliser is a polymer having a main chain substantially free of acidic groups and having hindered amine stabilising groups. The stabilising groups comprise at least 35 per cent by weight of the polymer. Preferably, the titanium dioxide particles are also treated with an organic compound such as a polyhydric alcohol, an alkanolamine, a polysiloxane or a fatty acid.