US PATENT SUBCLASS 525 / 300
.~.~.~.~.~ Oxygen atom is part of a ketone or ketene group

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}
298  DF  .~.~.~.~ Ethylenic reactant contains an oxygen atom {5}
300.~.~.~.~.~ Oxygen atom is part of a ketone or ketene group

DEFINITION

Classification: 525/300

Oxygen atom is part of a ketone or ketene group:

(under subclass 298) Subject matter wherein the oxygen atom is part of a ketone or ketene group, e.g., methyl vinyl ketone, etc.

(1) Note. Ketene readily forms a dimer known as diketene. Chemical studies indicate that diketene is composed mainly of vinylaceto-B-lactone (I) and B-crotonalactone (II). [figure] [figure]

SEE OR SEARCH THIS CLASS, SUBCLASS:

284, for use of ketene dimer as a reactant.