US PATENT SUBCLASS 525 / 395
.~.~.~ Mixed with -N=C=X-containing reactant or polymer therefrom (X is chalcogen)

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {4}
50  DF  .~ MIXING OF TWO OR MORE SOLID POLYMERS; MIXING OF SOLID POLYMER OR SICP WITH SICP OR SPFI; MIXING OF SICP WITH AN ETHYLENIC AGENT; MIXING OF SOLID POLYMER WITH A CHEMICAL TREATING OR ETHYLENIC AGENT; OR PROCESSES OF FORMING OR REACTING; OR THE RESULTANT PRODUCT OF ANY OF THE ABOVE OPERATIONS {32}
390  DF  .~.~ Solid polymer derived solely from phenolic reactants wherein none of the reactants contains a plurality of methylol groups or derivatives thereof {6}
395.~.~.~ Mixed with -N=C=X-containing reactant or polymer therefrom (X is chalcogen)

DEFINITION

Classification: 525/395

Mixed with -N=C=X-containing reactant or polymer therefrom (X is chalcogen):

(under subclass 390) Subject matter wherein the solid phenolic polymer is mixed with a -N=C=X or blocked -N=C=X-containing reactant or polymer derived therefrom (X is a chalcogen).

(1) Note. Blocking a -N=C=X (masked, hidden, etc.) is utilized to render the -N=C=X group inert by conversion to an inactive group. The process of reactivation usually involves merely heating so as to revert the blocked reactant to a C-N=C=X-containing reactant. The usual mode of rendering the -N=C=X reactant inert is to convert it to the form of a NO- group.