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. 02, 1977
Filed:
Apr. 16, 1976
Applicant:
Inventors:
Assignee:
Stamicarbon B. V., Geleen, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526 43 ; 526 17 ;
Abstract
Vinyl chloride polymers are chlorinated in a dry, two-step process including treating particulate vinyl chloride with gaseous chlorine at temperatures in the range of -20.degree. C to +50.degree. C, preferably 20.degree.-25.degree. C and without the use of radical-forming initiators or radiation for at least about 30 minutes, then increasing the temperature of the reaction to at least 70.degree. C until thermal radical formation occurs. In the second step the temperature is maintained below the point where the vinyl chloride is apt to agglomerate or discoloration occurs.