US PATENT SUBCLASS 525 / 243
.~.~.~.~ Reactions with ethylenic reactants in two or more diverse phases, e.g., bulk, emulsion, melt, solution, etc.

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}
243.~.~.~.~ Reactions with ethylenic reactants in two or more diverse phases, e.g., bulk, emulsion, melt, solution, etc.

DEFINITION

Classification: 525/243

Reactions with ethylenic reactants in two or more diverse phases, e.g., bulk, emulsion, melt, solution, etc.:

(under subclass 242) Subject matter wherein one or more polymerization reactions occur in two or more distinct phases.

(1) Note. This subclass typically covers those manipulative processes involving multiphase preparation of modified polymers, notably graft copolymers, e.g., prepolymerizing by mass polymerization of polybutadiene dissolved in styrene and then dispersing the mixture in an aqueous solution containing a suspending agent and finally polymerizing the suspended prepolymer mixture until substantially all the reactant has been polymerized to afford the final product, etc.