US PATENT SUBCLASS 524 / 589
.~.~.~ From -N=C=X reactant or blocked N=C=X reactant (X is chalcogen)

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
*  DD  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF (Class 523, subclass 1) {17}
1  DF  .~.~ Adding a NRM to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof {31}
589.~.~.~ From -N=C=X reactant or blocked N=C=X reactant (X is chalcogen) {1}
590  DF  .~.~.~.~> With reactant containing at least one C-OH, (C=O)-OH or -C-O-C- group {1}

DEFINITION

Classification: 524/589

From -N=C=X reactant or blocked N=C=X reactant (X is chalcogen):

(under subclass 1) Subject matter which involves the mixing of a nonreactant material with a solid polymer or SICP derived from at least one reactant containing a -N=C=X group wherein X is a chalcogen atom.

(1) Note. This subclass also provides for those functional derivatives of isocyanates which are generally known as blocked, masked, or hidden isocyanates. These materials are those which revert on heating to the -N=C=X group (e.g., urethanes or ureides of phenols, alkanols, etc.).