US PATENT SUBCLASS 252 / 182.22
.~.~.~.~.~ Urethane (-N-C(=O)-O-C-) group

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

182.11  DF  COMPOSITIONS CONTAINING A SINGLE CHEMICAL REACTANT OR PLURAL NONINTERACTIVE CHEMICAL REACTANTS; I.E., NOT VIS-A-VIS {2}
182.12  DF  .~ Organic reactant {4}
182.13  DF  .~.~ For subsequent solid polymer treatment or preparation; e.g., crosslinking, grafting, curing, hardening, vulcanizing, etc. {4}
182.2  DF  .~.~.~ Reactant contains isocyante (-N=C=O) or blocked isocyanate group {1}
182.21  DF  .~.~.~.~ Two or more reactants containing isocyanate or blocked isocyanate groups {1}
182.22.~.~.~.~.~ Urethane (-N-C(=O)-O-C-) group

DEFINITION

Classification: 252/182.22

Urethane (-N-C(=O)-O-C-) group:

(under subclass 182.21) Subject matter wherein the isocyanate compound in addition contains either a blocked isocyanate or urethane group.

(1) Note. Found here typically is a polyisocyanate treated with a polyol yielding an isocyanate terminated polyurethane.