US PATENT SUBCLASS 525 / 332.2
.~.~.~.~.~.~ Divinyl benzene

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}
326.1  DF  .~.~.~ Chemically after treated solid polymers derived from ethylenically unsaturated monomers only {24}
331.9  DF  .~.~.~.~ Polymer derived from monomer containing at least two ethylenic groups or diene rubber {7}
332.1  DF  .~.~.~.~.~ Monomer contains non-conjugated diene group or at least one fused or bridged ring or at least one cycloaliphatic structure {1}
332.2.~.~.~.~.~.~ Divinyl benzene

DEFINITION

Classification: 525/332.2

Divinyl benzene:

(under subclass 332.1) Product wherein the nonconjugated ethylene monomer is divinyl benzene.

(1) Note. Divinyl benzene is often described as a cross-linking agent for a base polymer, e.g., polystyrene cross-linked with divinyl benzene, etc. Such systems will be presumed to have been prepared by interpolymerization of, e.g., styrene monomer with monomeric divinyl benzene in absence of specific disclosure that the divinyl benzene is reacted with the previously formed base polymer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

242+, for polymers derived from ethylenic reactants only mixed with ethylenic reactant.