Process for preparing synthetic resins having anion exchanger pr

Details Process for preparing synthetic resins having anion exchanger pr Process for preparing synthetic resins having anion exchanger pr

1988-09-14

1990-08-28

Schoffer, Joseph L.

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

Synthetic resins

Ion-exchange polymer or process of preparing

525375, C08F 520, C08F 830, C08C 1922

Patent

active

049526081

ABSTRACT:
The invention relates to a process for preparing anion exchangers based on crosslinked, water-insoluble organic polymers containing aromatic nuclei, in which, in the first step, N-hydroxymethylphthalimide is produced by reaction of phthalimide with aqueous formaldehyde solution in swelling agents in the presence of bases; if desired, this N-hydroxymethylphthalimide is converted in a 2nd step to the bis)phthalimidomethyl)ether or an ester of N-hydroxymethylphthalimide; said polymers are aminomethylated wtih N-hydroxy-methylphthalimide, bis)phthalimidomethyl) ether or an ester of N-hydroxymethylphthalimide in the presence of Friedel-Craft catalysts and swelling agents and the amidomethylated polymers are finally saponified to form the aminomethylated polymers, wherein, in the first reaction step, the base used for producing N-hy-droxymethylphthalimide is sodium hydroxide solution and this sodium hydroxide solution is added in such an amount and at such a rate that the reaction of phthalimide with formaldehyde takes place in the pH range of 5 to 6.

REFERENCES:
patent: 3767671 (1973-10-01), Klebe et al.
patent: 3882053 (1975-05-01), Corte et al.
patent: 3925264 (1975-12-01), Corte et al.
patent: 4077918 (1978-03-01), Corte et al.
J. Eng. Chem. vol. 37, No. 3, 1972 pp. 391-394.

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