US PATENT SUBCLASS 525 / 62
.~.~.~.~ Processes only of preparing polyvinyl alcohol

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}
62.~.~.~.~ Processes only of preparing polyvinyl alcohol

DEFINITION

Classification: 525/62

Processes only of preparing polyvinyl alcohol:

(under subclass 56) Subject matter wherein a nonvinyl alcohol unit precursor polymer is modified so as to prepare a vinyl alcohol-containing polymer therefrom.

(1) Note. For the most part the patents herein relate to subsequent aftertreatment of polymeric vinyl carboxylates.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61, for processes of chemically modifying a vinyl alcohol unit-containing polymer.