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US 4,045,379 AGranted
Process for preparation of modified ion-exchange resin
AssigneeShell Oil Company
InventorsArien Kwantes, Pieter A. Gautier, Anthony L. Farragher
Life of this patent
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Abstract
An improved process for preparing bisphenols is described wherein a phenol is reacted with a ketone or aldehyde such as acetone in the presence of an ion-exchange resin modified by partial neutralization with p-aminothiophenol.
Claims2
A substantially water-insoluble cation exchange resin having an exchange capacity of from 2.6 to 5.2 meq/g dry weight comprising a plurality of mercaptoamine sulfonic acid salt groups, wherein said salt groups are cyclic aromatic mercaptoamine sulfonic acid salt groups wherein the mercapto and the amino groups are bound directly to the aromatic nucleus thereof.
Dependencies are inferred from the claim text.