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. 21, 1987
Filed:
Mar. 06, 1986
Applicant:
Inventor:
Joao M Correia, Lisbon, PT;
Assignee:
Enichem Elastomers Limited, Hardley, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09F / ;
U.S. Cl.
CPC ...
260 97 ; 260 98 ; 260 995 ;
Abstract
The process relates to a method of improving the color and/or reducing the oxidized acids content of the disproportionated product obtained by heating rosin acids in rosin and tall oil with a catalyst comprising iodine, an iron compound and ammonia, an ammonium salt or an amine. The improvement comprises a pretreatment step in which the starting material is heated with an effective amount not in excess of 0.5% by weight of elemental sulphur, based on the weight of starting material for a period, usually less than one hour. As little as 0.1% by weight of sulphur is sufficient in most cases.