US PATENT SUBCLASS 521 / 155
.~.~ Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
155.~.~ Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom {10}
156  DF  .~.~.~> With three-membered heterocyclic reactant containing two carbon atoms and a hetero atom (i.e., nitrogen or a chalcogen atom)
157  DF  .~.~.~> With a C-C(=X)-XH or C-C(=X)-X-C(=X)-C- reactant wherein X is a chalcogen atom, e.g., carboxylic acid or anhydride, etc.
158  DF  .~.~.~> With ketone, aldehyde, or aldehyde derivative
159  DF  .~.~.~> N=C=X reactant having at least two C-NH-C(=X)- groups, e.g., prepolymers, etc.
160  DF  .~.~.~> Two or more N=C=X reactants
161  DF  .~.~.~> N=C=X reactant contains a heterocyclic ring
162  DF  .~.~.~> N=C=X reactant contains atoms other than carbon and hydrogen and other than nitrogen and chalcogen as part of the N=C=X group
163  DF  .~.~.~> With nitrogen containing reactant {1}
168  DF  .~.~.~> With phosphorus containing reactant {1}
170  DF  .~.~.~> With -XH reactant wherein X is a chalcogen atom {3}

DEFINITION

Classification: 521/155

Cellular product derived from a -N=C=X containing reactant wherein X is a chalcogen atom:

(under subclass 50) Subject matter involving a cellular polymer derived form at least one reactant which contains a -N=C=X group (X is a chalcogen)or process of preparing; composition containing a polymer derived from a reactant containing a -N=C=X group or involving a polymerizable reactant containing a -N=C=X (X is a chalcogen)group and which composition is capable of preparing a cellular product or processes of preparing same; processes of treating a cellular polymer derived from a -N=C=X (X is a chalcogen)containing reactant with a material which neither reacts with the cellular polymer to change or modify chemical bonds therein or neither forms a desired composition with the cellular polymer or products of such a treatment; processes of treating a cellular polymer derived from a -N=C=X reactant without the addition of a material thereto whereby a physical

or chemical change in the polymer may be effected or products which are the result of such a treatment.

(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, lactams, oximes, etc.).

(2) Note. Where a -N=C=X group is produced by an in situ reaction or a decomposition reaction (other than blocked, masked, or hidden isocyanates), those patents have been placed as originals in the subclass which provides for the compound prior to its decomposition or on the basis of the reactants undergoing the in situ reaction, e.g., carbonates or oxalates, etc.

(3) Note. This subclass includes those compounds wherein the nitrogen (-N=C=X) may or may not be bonded to a carbon atom.

SEE OR SEARCH THIS CLASS, SUBCLASS:

53+, for a process of treating a cellular polymer with a material so as to modify or change chemical bonds in the cellular polymer or wherein a material is added to a cellular polymer to form a desired composition therewith, or for cellular products which are the result of such a treating operation.

SEE OR SEARCH CLASS 528, Synthetic Resins or Natural Rubbers,

44+, for a noncellular polymer derived from a -N=C=X containing reactant.