US PATENT SUBCLASS 521 / 30
.~.~ Chemically treated solid polymer

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
25  DF  .~ ION-EXCHANGE POLYMER OR PROCESS OF PREPARING {7}
30.~.~ Chemically treated solid polymer {3}
31  DF  .~.~.~> Solid polymer derived from ethylenically unsaturated reactant only {2}
34  DF  .~.~.~> Solid polymer derived from at least one 1,2-epoxy containing reactant
35  DF  .~.~.~> Solid polymer derived from aldehyde or derivative {2}

DEFINITION

Classification: 521/30

(under subclass 25) Subject matter wherein a solid polymer is ionically modified by using a reactive chemical agent so as to form an ion-exchange polymer.

(1) Note. Included in this subclass are chemical modifications of a preformed ionic polymer by ionic interchange, as well as modifications of ionic polymers by oxidation, reduction, hydrolyzation, saponification and the like.

(2) Note. Patents are placed in this area on the basis of the original monomers that were reacted to produce a solid polymer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

31, for carboxylated polyacrylonitrile, an aftertreated product for which there is no specific indent subclass, because the original solid polymer (polyacrylonitrile) has been derived from only an ethylenically unsaturated reactant (acrylonitrile), and because the aftertreatment involved no nitrogen or sulphur reactant.

33, for those instances where a polymer is initially carboxylated and then reacted with a sulphur material. This subclass also provides for a carboxylated poly acrylonitrile which is further treated with a sulphur material.