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:
Apr. 22, 1997
Filed:
Apr. 05, 1995
Toyo Ink Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A process for the production of a dis-azo pigment having excellent dispersibility, high tinting strength and high masking strength, by a simple method under an improved working environment, which is improved in a drying step and can omit the pulverization step of a conventional process, the present process comprising (a) a first step of forming an aqueous paste or slurry containing a synthesized dis-azo pigment into fine particles under hot air at 100.degree. to 300.degree. C. for a short period of time within 0.5 hour, and at the same time, removing water from the formed fine particles to form a powder, and (b) a second step of keeping the powder under heat at 50.degree. to 150.degree. C. for 0.5 to 10 hours.