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. 09, 1983
Filed:
May. 22, 1981
Charles K Chiklis, Lexington, MA (US);
Alan N Schuler, Lexington, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
A process for preparing polymeric oximes and photographic processing compositions containing polymeric oximes are described. The polymeric oximes are prepared by a process which comprises: introducing into an aqueous polymerization medium a portion of a polymerizable monomer to be polymerized, said polymerizable monomer having the formula ##STR1## wherein R is hydrogen or methyl, R.sup.1 is hydrogen, alkyl of from 1 to 4 carbon atoms, benzyl or phenyl, R.sup.2 is alkyl of from 1 to 4 carbon atoms, benzyl or phenyl, alkylene is a divalent alkylene radical having 1 or 2 carbon atoms, and R.sup.3 is hydrogen, alkyl of from 1 to 4 carbon atoms or phenyl; initiating the emulsion polymerization of said monomer, and while maintaining said polymerization, introducing substantially uniformly over the course of the polymerization, the remaining polymerizable monomer to be polymerized, thereby to provide a polymeric latex of polymeric particles of said polymerizable monomer in a water medium; contacting said polymeric latex with an organic solvent for said latex particles in an amount sufficient to effect swelling of the polymeric particles in said medium; and oximating the swollen polymeric particles by reaction with hydroxylamine salt and an amount of alkalinity sufficient to provide free hydroxylamine for said oximation but insufficient to effect alkali solubilization of the resulting oximated polymeric particles.