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US 4,455,409 AGranted
Method for making bisphenol catalysts
AssigneeGeneral Electric Company
InventorsGary R. Faler, John R. Campbell
Life of this patent
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Abstract
A method is provided for making sulfonated aromatic organic polymers having aminoorganomercaptan groups attached to backbone sulfonyl radicals by covalent nitrogen-sulfur linkages. These sulfonated aromatic organic polymers can be used as an ion-exchange resin for making bisphenols.
Claims7
A method for making sulfonated aromatic organic polymer having aminoorganomercaptan groups attached to backbone sulfonyl radicals by covalent nitrogen-sulfur linkages which comprises
- (A) effecting reaction in the presence of base between
- (a) a halosulfonyl aromatic organic polymer and
- (b) a thioether of the formula ##STR8## to produce sulfonated aromatic organic polymer having aminoorganothioether groups attached to backbone sulfonyl radicals by covalent nitrogen-sulfur linkages,
- (B) contacting the resulting sulfonated aromatic organic polymer of (A) with an effective amount of a phenolic acceptor and a sulfonic acid containing ether cleaving catalyst to produce the corresponding covalently bonded aminoorganomercaptan groups, and
- (C) recovering the resulting aromatic organic polymer having covalently bonded aminoorganomercaptan groups from the mixture of (B),
- where R is selected from hydrogen and a C.sub.(1-8) alkyl radical, R.sup.1 is a divalent C.sub.(1-13) organic radical, R.sup.2 is a cleavable organic radical and Y is selected from hydrogen, carboxy and nitrile.
3 more elements
Dependencies are inferred from the claim text.