Strong-acid cation exchange resins

Details Strong-acid cation exchange resins Strong-acid cation exchange resins

2011-08-02

2011-08-02

Bernshteyn, Michael M (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ion-exchange polymer or process of preparing

C521S025000

Reexamination Certificate

active

07989514

ABSTRACT:
A strong-acid cation exchange resin comprising a plurality of acid groups which are partially neutralized with a cation of formula (I); wherein R1at each occurrence independently is hydrogen or a Ci-4-alkyl group, R2at each occurrence independently is hydrogen, alkyl or aryl, R3at each occurrence independently is hydrogen or alkyl or two vicinal groups R3together form an aromatic ring, m is 1, 2, 3, 4, 5 or 6, n is 1, 2, 3 or 4, o is 1 or 2, and p is 1, 2 or 3, is useful in the production of bisphenols.

REFERENCES:
patent: 5212206 (1993-05-01), Rudolph et al.

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