US PATENT SUBCLASS 525 / 61
.~.~.~.~ Chemical modification utilizing a chemical treating agent

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}
56  DF  .~.~.~ Polyvinyl alcohol {6}
61.~.~.~.~ Chemical modification utilizing a chemical treating agent

DEFINITION

Classification: 525/61

Chemical modification utilizing a chemical treating agent:

(under subclass 56) Subject matter drawn to processes of chemically modifying homopolymers and copolymers of vinyl alcohol using a chemical treating agent, e.g., treating polyvinyl alcohol with aldehydes to give polyacetate or with

PC15 to substitute the hydroxyl group, with chlorine atoms, etc.