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. 11, 1992
Filed:
Apr. 21, 1989
Applicant:
Inventors:
William J Harris, Midland, MI (US);
Ming-Biann Liu, Clayton, CA (US);
Luke R Kleiss, Evanston, IL (US);
Zenon Lysenko, Midland, MI (US);
Steven Rosenberg, Midland, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
528185 ; 528179 ; 528183 ; 528184 ; 528207 ; 528208 ; 528210 ; 528211 ; 528286 ; 528289 ; 528290 ; 528291 ; 528336 ; 528337 ; 528339 ; 528341 ; 528377 ; 558169 ; 568-8 ;
Abstract
PBZ polymers are synthesized by the reaction of AA- and BB-monomers. The BB-monomer is conveniently synthesized and isolated as a phosphate salt having a uniform number of phosphate ions associated with each BB-monomer ion. Such high purity monophosphate and diphosphate salts can be obtained by precipitating the monomer from an aqueous acid solution by adjusting the pH balance or from a mixture of phosphoric acid and a volatile, polar, saturated organic liquid at a relatively low temperature.