METHOD FOR THE DIIMIDE HYDROGENATION OF EMULSIFIED UNSATURATED POLYMERS

The diimide hydrogenation of unsaturated elastomers in latex utilizing hydrazine and hydrogen peroxide or oxygen, is a metal-catalyzed process. Copper ion has been found to be the most superior catalyst for this reaction, requiring an extremely low concentration for optimal results. Generated diimid...

Full description

Saved in:
Bibliographic Details
Main Author Parker, Dane K
Format Patent
LanguageEnglish
Published 14.03.2024
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS
Online AccessGet full text

Cover

More Information
Summary:The diimide hydrogenation of unsaturated elastomers in latex utilizing hydrazine and hydrogen peroxide or oxygen, is a metal-catalyzed process. Copper ion has been found to be the most superior catalyst for this reaction, requiring an extremely low concentration for optimal results. Generated diimide efficiently hydrogenates the polymer olefinic unsaturation while generating water and nitrogen as byproducts. With a falling hydrazine concentration during the hydrogenation process however, a competing copper-catalyzed process capable of generating hydroxyl, superoxide and/or copper-oxyl radicals becomes increasingly competitive. The ability of these radical species to abstract hydrogen from the polymer backbone to generate polymeric radicals, ultimately results in crosslinking that occurs concurrently with hydrogenation. The concept of an OH radical inactivating ligand (OIL) complexed with copper is demonstrated to ameliorate the crosslinking reaction.
Bibliography:Application Number: US202318488370