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:
Oct. 05, 1976
Filed:
Jun. 05, 1974
Applicant:
Inventors:
Aurelio Frederick Sirianni, Ottawa, CA;
Ira Edwin Puddington, Ottawa, CA;
Assignee:
Canadian Patents and Development Limited, Ottawa, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08H / ; C08L / ; C08L / ; C08L / ;
U.S. Cl.
CPC ...
260 175 ; 260762 ;
Abstract
Lignin of improved reinforcing properties in polymers, is prepared by steps comprising: A. laundering crude lignin in an aqueous medium, B. reforming the lignin at a pH of about 2 to about 3 at a temperature of about 88.degree. to 95.degree.C, and C. washing the reformed precipitate to remove soluble material and drying the resulting solids. Polymer latices can be added before final pecipitation and the lignin-latex coprecipitated. The lignin can be milled directly into rubber to give good ultimate tensile strengths. This lignin can also be used as a reactive reinforcing filler in plastics.