US PATENT SUBCLASS 508 / 235
.~.~.~ An additional olefinic reactant is copolymerized with an unsaturated carboxylic acid anhydride so that the anhydride moiety forms part of the polymer backbone (i.e., addition polymerization)

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508 /   HD   SOLID ANTI-FRICTION DEVICES, MATERIALS THEREFOR, LUBRICANT OR SEPARATE COMPOSITIONS FOR MOVING SOLID SURFACES, AND MISCELLANEOUS MINERAL OIL COMPOSITIONS

110  DF  LUBRICANTS OR SEPARANTS FOR MOVING SOLID SURFACES AND MISCELLANEOUS MINERAL OIL COMPOSITIONS (E.G., WATER CONTAINING, ETC.) {53}
221  DF  .~ Compound of indeterminate structure, prepared by reacting a heterocyclic compound of known structure; a heterocyclic ring is one having as ring members only carbon and at least one hetero atom selected from nitrogen and chalcogen (oxygen, sulfur, selenium, or tellurium) {9}
232  DF  .~.~ The heterocyclic compound reactant contains a carboxylic acid anhydride ring {7}
235.~.~.~ An additional olefinic reactant is copolymerized with an unsaturated carboxylic acid anhydride so that the anhydride moiety forms part of the polymer backbone (i.e., addition polymerization)

DEFINITION

Classification: 508/235

An additional olefinic reactant is copolymerized with an unsaturated carboxylic acid anhydride so that the anhydride moiety forms part of the polymer backbone (i.e., addition polymerization):

(under subclass 232) Compositions wherein an unsaturated carboxylic acid anhydride is copolymerized by addition polymerization with an additional olefinic reactant so that the anhydride moiety forms part of the polymer backbone.

(1) Note. Maleic anhydride is the most common unsaturated carboxylic acid anhydride reactant provided for herein.

(2) Note. The additional olefinic reactant may be cycloolefinic.