Process for the alkaline saponification of crosslinked...

Details Process for the alkaline saponification of crosslinked... Process for the alkaline saponification of crosslinked...

2007-01-23

2007-01-23

Lipman, Bernard (Department: 1713)

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

Synthetic resins

Ion-exchange polymer or process of preparing

C525S329100, C525S329200, C525S329300, C525S369000

Reexamination Certificate

active

10830324

ABSTRACT:
The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature T1of from 70 to 120° C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature T2of from 120 to 180° C.

REFERENCES:
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A. Litmanovich, et al., “Alkaline Hydrolysis of Polyacrylonitrile. On the Reaction Mechanism”, Macromol., Chem. Phys., 2000, vol. 201, p. 2176-2180.

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