Patent ID: 9051414
Filing Date: 2015-06-09
Classification: C07C,C08G,C08L

Abstract:
1. A method for making thermosetting resins from syringaldehydes, comprising: reductively coupling syringaldehyde with an additional molecule of syringaldehyde or at least one aromatic aldehyde having a hydroxy group, and/or methoxy group in at least one position on said aldehyde by a McMurry reaction or by reductive chemical or electrochemical reaction to produce at least one first reductive coupling product; further reducing said first reductive coupling product by hydrogenation or chemical reduction or electrochemical reduction to produce a second reductive coupling product; deoxygenating and demethylating said second reductive product(s) by conversion to a sulfonate followed by reaction with a reductive elimination catalyst and further reaction with a hydrolyzing reagent to produce polyphenols; and converting said polyphenols to thermosetting resins selected from the group consisting of epoxy resins, benzoxazine resins, phenolic resins, bismaleimide resins, polyphenylene resins, phthalonitrile endcapped resins, phenylethynyl endcapped resins, and other endcapped resins.