US PATENT SUBCLASS 521 / 49
.~.~ Treating polyurethane, polyurea (excluding urea-formaldehyde polymers), polyisocyanurate or polycarbodiimide


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}
40  DF  .~ PROCESS OF TREATING SCRAP OR WASTE PRODUCT CONTAINING SOLID ORGANIC POLYMER TO RECOVER A SOLID POLYMER THEREFROM {5}
49.~.~ Treating polyurethane, polyurea (excluding urea-formaldehyde polymers), polyisocyanurate or polycarbodiimide {1}
49.5  DF  .~.~.~> Treating with alcohol or amine


DEFINITION

Classification: 521/49

Treating polyurethane, polyurea (excluding urea-formaldehyde polymers): polyisocyanurate or polycarbodimide:

(under subclass 40) Subject matter wherein the scrap or waste product contains either a polyurethane, polyurea, polylsocyanurate, or a polycarbodimide.

(1) Note. A polyurethane is defined to be a polymer containing the moiety, -N- - O -, and is generally prepared for a polyocyanate and a polyol or from a bishaloformate and a diamine.

(2) Note. A polyurea is defined to be a polymer containing the moiety, -NN-, and is generally prepared from either a diamine and a dilsocyanate, a diamine and urea, a diamine and phosgene or a bishaloformate and a diamine.

(3) Note. A polyisocyanurate is defined to be a polymer containing the cyclic moiety shown below, and is generally derived from a polyisocyanate. O

(4) Note. A polycarbodiimide is defined to be a polymer containing the moiety, -N=C=N-, and is generally defined from two or more polyisocyanates.

(5) Note. A mere disclosure of a polyurethane, polyurea, polyisocyanurate or polycarbodimide in which the method of making said polymer is not claimed or disclosed is presumed to lie within the definition of this subclass.