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:
Aug. 28, 2012
Filed:
Apr. 30, 2008
Raksh Vir Jasra, Bhavnagar, IN;
Haresh Mahipatlal Mody, Bhavnagar, IN;
Rajesh Shantilal Somani, Bhavnagar, IN;
Hari Chand Bajaj, Bhavnagar, IN;
Dipak Balwantrai Shukla, Bhavnagar, IN;
Niraj Rameshchandra Vyas, Bhavnagar, IN;
Raksh Vir Jasra, Bhavnagar, IN;
Haresh Mahipatlal Mody, Bhavnagar, IN;
Rajesh Shantilal Somani, Bhavnagar, IN;
Hari Chand Bajaj, Bhavnagar, IN;
Dipak Balwantrai Shukla, Bhavnagar, IN;
Niraj Rameshchandra Vyas, Bhavnagar, IN;
Council of Scientific & Industrial Research, New Delhi, IN;
Abstract
The present invention provides a process for the preparation of finely divided precipitated silica. Finely divided precipitated silica is prepared by neutralization of alkali silicate solution, under continuous stirring, at 60° to 90° C. in presence of alkali metal salt as coagulating agent, in various neutralization steps during which neutralization is interrupted for specific time. Further acidic silica sol, is added until 60 to 80% of total alkali is neutralized. The reaction mixture is then aged at least for 3 minute under continuous agitation, followed by circulation through centrifugal pump at an appropriate rate.