US PATENT SUBCLASS 528 / 67
.~.~ From two or more reactants containing -N=C=X groups

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
67.~.~ From two or more reactants containing -N=C=X groups

DEFINITION

Classification: 528/67

(under subclass 44) Subject matter wherein at least two reactants containing a -N=C=X (X is chalcogen) group are polymerized.

(1) Note. Excluded from this subclass are those conventional commercial compositions which are mixtures of toluene discoyanate (e.g., 2, 4 and 2, 6 TDi, 20/80 percent and 35/65 percent, etc.). However, mixtures of stereo and position isomers are included herein if proportions are recited.