US PATENT SUBCLASS 525 / 280
.~.~.~.~.~ Block copolymer

Current as of: June, 1999
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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}
55  DF  .~.~ At least one solid polymer derived from ethylenic reactants only {25}
242  DF  .~.~.~ Polymer derived from ethylenic reactants only mixed with ethylenic reactant {21}
279  DF  .~.~.~.~ Ethylenic reactant contains nitrogen heterocycle, e.g., pyridine, diazines, etc. {4}
280.~.~.~.~.~ Block copolymer

DEFINITION

Classification: 525/280

Block copolymer:

(under subclass 279) Subject matter wherein the solid polymer is a block copolymer derived from an ethylenic reactant containing a nitrogen heterocycle, e.g., (poly-2-methyl-3-vinylpyridine-poly-styrene) block copolymer, etc.

(1) Note. Grafted poly-2-vinyl-pyridine onto (poly-styrene-poly-butadiene) block copolymer is not proper for this subclass but in subclass 279 since the block portion is devoid of a nitrogen reactant.