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:
Sep. 18, 1990
Filed:
Mar. 19, 1984
Applicant:
Inventor:
Helena Ljusberg-Wahren, Soderhamn, SE;
Assignee:
Bergvik Kemi AB, , SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C10L / ;
U.S. Cl.
CPC ...
44 51 ; 2523115 ; 252354 ; 252356 ; 260404 ;
Abstract
A dispersing agent for solid particles in water, which is a tall oil pitch partially esterified with a polyalkylene glycol mainly composed of ethylene oxide units of a molecular weight of above 600 or a monoester or monoether thereof and optionally also aminated having a residual acid value higher than 3, and a process for preparing said dispersing agent which comprises heating the two reactants at 200.degree.-285.degree. C. for so long that the maximum acid value of the reaction mixture at this temperature is reduced at least 2 units. The dispersing agent can be used to disperse coal particles in water.