US PATENT SUBCLASS 525 / 91
.~.~.~.~.~ Block derived from at least one saturated reactant containing a heterocycle

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}
88  DF  .~.~.~ Mixing of solid block or block-type copolymer with other solid polymer; mixing of said polymer mixture with a chemical treating agent; mixing of a block or block-type copolymer with SICP or with SPFI; or processes of forming or reacting; or the resultant product of any of the above operations {5}
90  DF  .~.~.~.~ Mixture contains solid block copolymer wherein at least one block is derived from ethylenic reactants only and at least one block is derived from at least one saturated reactant {1}
91.~.~.~.~.~ Block derived from at least one saturated reactant containing a heterocycle

DEFINITION

Classification: 525/91

Block derived from at least one saturated reactant containing a heterocycle:

(under subclass 90) Subject matter wherein block polymer from at least one saturated reactant is derived from a heterocyclic reactant, e.g., butadiene-butyolactone block copolymer, etc.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, the Glossary, for a definition of the term "heterocyclic".