US PATENT SUBCLASS 525 / 54.22
.~.~.~.~ Previously formed solid polymer is derived from N=C=X reactant or contains N=C=X group wherein X is chalcogen

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
54.2  DF  .~.~ Previously formed solid polymer chemically reacted with carbohydrate or derivative {2}
54.21  DF  .~.~.~ Cellulose or derivative as chemical reactant {2}
54.22.~.~.~.~ Previously formed solid polymer is derived from N=C=X reactant or contains N=C=X group wherein X is chalcogen

DEFINITION

Classification: 525/54.22

Previously formed solid polymer is derived from N=C=X reactant or contains N=C=X group wherein X is chalcogen:

(under subclass 54.21) Subject matter wherein a N=C=X reactant is a precursor for the solid polymer or the solid polymer contains N=C=X groups, and wherein X is a chalcogen atom (i.e., oxygen, sulfur, selenium, or tellurium).

(1) Note. So-called "Blocked" isocyanates are included herein since presumably free N=C=X is regenerated prior to reaction.