US PATENT SUBCLASS 525 / 267
.~.~.~.~ Including step of preparing a polymer in the presence of a specified material and in the absence of a preformed polymer derived from ethylenic reactant only

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}
267.~.~.~.~ Including step of preparing a polymer in the presence of a specified material and in the absence of a preformed polymer derived from ethylenic reactant only {3}
268  DF  .~.~.~.~.~> Specified material contains a transition metal atom {2}
271  DF  .~.~.~.~.~> Specified material contains a Group IA atom in elemental form or bonded to hydrogen or carbon {1}
273  DF  .~.~.~.~.~> Specified material contains a compound containing a peroxy group, i.e., -O O-

DEFINITION

Classification: 525/267

Including step of preparing a polymer in the presence of a specified material and in the absence of a preformed polymer derived from ethylenic reactant only:

(under subclass 242) Subject matter drawn to processes which include the step of initially preparing a polymer in the presence of a specified material.

(1) Note. This subclass excludes the presence of a preformed polymer derived from ethylenic reactants only. In the Class Definition of this class, see Lines With Other Classes and Within This Class, section II. B(3) for lines between this subclass and its indents.

(2) Note. The specified material must present at some time prior to the completion of the in situ polymerization of the initial polymer and may remain during the final reaction with the ethylenic reactant.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, the Glossary, for the definition of the term "specified material".