US PATENT SUBCLASS 544 / 193
.~.~.~.~ Trimerization process to form the triazine ring

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544 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
180  DF  .~.~.~ Triazines {11}
193.~.~.~.~ Trimerization process to form the triazine ring

DEFINITION

Classification: 544/193

(under subclass 180) Processes wherein the six-membered hetero ring is formed by a trimerization reaction of a monomer.

(1) Note. This subclass provides for homotrimerization processes only. Compounds produced by reactions other than homopolymerizations are classified with the product.

(2) Note. Examples of monomers employed in the trimerization reaction are isocyanates and nitriles.