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:
Nov. 26, 1991
Filed:
Dec. 01, 1989
Applicant:
Inventor:
Jenifer L Robb, Stockton on Tees, GB;
Assignee:
Tioxide Group PLC, , GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01J / ;
U.S. Cl.
CPC ...
2523131 ; 2523154 ; 106436 ; 106442 ;
Abstract
An aqueous dispersion of acicular fine particle size titanium dioxide containing from 20 to 60% by weight solids content and a polycarboxylic dispersant is of outstanding use in the preparation of sun screens. The dispersions are transparent to visible light and absorbant to UV light of broad spectrum. Usually the titanium dioxide has a largest dimension within the range 0.01 to 0.15 micron. The dispersions are produced by milling, preferably in a high speed mill, until the required UV absorbancy is attained.