Method for preparing cross-linked vinylaromatic polymers contain

Details Method for preparing cross-linked vinylaromatic polymers contain Method for preparing cross-linked vinylaromatic polymers contain

1977-02-28

1981-06-02

Henderson, C. A.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525327, 525336, 525344, 525367, C08F 830

Patent

active

042712769

ABSTRACT:
The method for preparing cross-linked vinylaromatic polymers containing nitro groups having the general formula ##STR1## where R' is H, NO.sub.2, COOH, SO.sub.3 H, P(O)(OH).sub.2, or P(O)H(OH), m is from 60 to 99 and n is from 40 to 1, consists in treatment of the starting cross-linked polymers having the general formula ##STR2## where R is H, COOH, SO.sub.3 H, P(O)(OH).sub.2, or P(O)(OH), m is from 60 to 99 and n is from 40 to 1, with a mixture of an alkali metal nitrate and an acid agent, at a temperature from -5.degree. to 95.degree. C. The quantity of the alkali metal nitrate in the nitrating mixture is from 0.1 to 8 moles per mole of the starting cross-linked polymer.
The method provides conditions for preparing cross-linked vinylaromatic polymers, containing nitro groups, having higher mechanical strength, high osmotic stability, and their volume in an ion-exchange column changes insignificantly as acid media are changed for alkaline, and vice versa.

REFERENCES:
Lenz, Organic Chemistry of Synthetic High Polymers, Interscience Publishers, (1967), pp. 688, 689.
Fettes, [Chemical Reactions of Polymers, Interscience Publishers, (1964), pp. 1, 2.
Groggins, P. H., Unit Processes in Organic Synthesis, McGraw-Hill, (N. Y.), 1952, pp. 23, 24, 2, 4.
Chem. Abst., 64, 12890(h), 1966.

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