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:
Oct. 29, 1985
Filed:
Oct. 11, 1983
Applicant:
Inventors:
Susan M Morris, John's Island, SC (US);
Thomas J Thomas, Summerville, SC (US);
Dietmar Kalz, Summerville, SC (US);
Assignee:
Mobay Chemical Corporation, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C09K / ; C11D / ; D06L / ;
U.S. Cl.
CPC ...
25230123 ; 8648 ; 252524 ; 252543 ; 5441932 ;
Abstract
The present invention is concerned with the modification of the sodium salt of a known optical brightener to obtain a white crystalline material. The commercially available 4,4'-bis-(2-anilino-4-phenylamino-1,3,5-triazinyl-6-amino)-stilbene-2,2'-d isulphonic acid is neutralized with a sodium base such as caustic and exposed to temperatures above about 65.degree. C. as an aqueous slurry containing some undissolved disodium salt. The water solubility of this salt may be inhibited by the addition of an electrolyte and the product may be recovered by spray drying.