US PATENT SUBCLASS 528 / 59
.~.~ From N=C=X reactant having at least two -C-NH-C(=X)- groups

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
59.~.~ From N=C=X reactant having at least two -C-NH-C(=X)- groups {3}
60  DF  .~.~.~> With reactant compound containing three or more XH, -C(=X)-XH, -NH, =NH, or HNH groups or combination thereof
61  DF  .~.~.~> With organic nitrogen reactant which contains two NH, =NH, or HNH groups {3}
65  DF  .~.~.~> With reactant having two -XH groups {1}

DEFINITION

Classification: 528/59

(under subclass 44) Subject matter wherein the -N=C=X (X is chalcogen) reactant contains at least two groups.

(1) Note. Patents for the most part herein are drawn to the after treatment of a liquid prepolymer having terminal -N=C=X groups.

(2) Note. The addition of materials to a prepolymer intermediate characterized by terms such as chain extenders, chain-lengthening material, cross-linking or curing agents, is not sufficient absent an amount of a material of chemical identity of added material (chemical identity is identical to what is required of a specified material).

(3) Note. For purposes of this subclass a carboxylic acid anhydride is considered as having two free carboxylic acid groups.

SEE OR SEARCH THIS CLASS, SUBCLASS:

67, through 85, for products and processes where a prepolymer is inherently prepared in an ongoing polymerization reaction and is subsequently modified, but where no intent has been made to recognize or identify the prepolymer intermediate.