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:
Jun. 23, 1981
Filed:
Jan. 17, 1977
Applicant:
Inventors:
Richard D Gless, Jr, Oakland, CA (US);
Daniel J Dawson, Mountain View, CA (US);
Robert E Wingard, Palo Alto, CA (US);
Assignee:
Dynapol, Palo Alto, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ; C09B / ; C09B / ;
U.S. Cl.
CPC ...
260144 ; 260141 ; 260152 ; 260159 ;
Abstract
Polymeric colorants are prepared by the process of (a) reacting acetaldehyde and acetamide in a mole ratio of 1:2-4 with an acid catalyst to form ethylidene-bis-acetamide, (b) cracking the ethylidene-bis-acetamide to vinylacetamide, (c) polymerizing the vinylacetamide with a free-radical catalyst, (d) hydrolyzing the resulting polymer with mineral acid and neutralizing with base to yield poly(vinylamine), and (e) coupling monomeric optically chromophoric groups to amine nitrogens of the poly(vinylamine).