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:
Feb. 21, 1978
Filed:
May. 30, 1974
Applicant:
Inventors:
Ronald Edward MacLeay, Williamsville, NY (US);
Chester Stephen Sheppard, Tonawanda, NY (US);
Assignee:
Pennwalt Corporation, Philadelphia, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C08L / ; C08L / ;
U.S. Cl.
CPC ...
260877 ; 260152 ; 260163 ; 260169 ; 260173 ; 260174 ; 260192 ; 260193 ; 260871 ; 260874 ; 260875 ; 2608 / ; 2608 / ; 2608 / ; 260881 ; 260884 ; 260885 ; 260886 ;
Abstract
A process for preparing a block polymer by first forming a polymer having azo functions by reacting vinyl polymer and a polyazo compound under conditions so that one of the azo functions rupture leaving the other azo function in tact; then, vinyl monomer is reacted with the polymer to produce the block copolymer. The polyazo compounds must contain at least one alkyl or aryl thio or oxa group alpha to at least one of the azo groups in the connecting chain between the azo groups to be useful as the sequential generator of free radicals.