US PATENT SUBCLASS 524 / 557
.~.~.~.~.~ Polyvinyl alcohol or modified forms thereof

Current as of: June, 1999
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524 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {1}
*  DD  .~ PROCESSES OF PREPARING A DESIRED OR INTENTIONAL COMPOSITION OF AT LEAST ONE NONREACTANT MATERIAL AND AT LEAST ONE SOLID POLYMER OR SPECIFIED INTERMEDIATE CONDENSATION PRODUCT, OR PRODUCT THEREOF (Class 523, subclass 1) {17}
1  DF  .~.~ Adding a NRM to a preformed solid polymer or preformed specified intermediate condensation product, composition thereof; or process of treating or composition thereof {31}
543  DF  .~.~.~ Polymer derived from ethylenic reactants only {11}
556  DF  .~.~.~.~ From carboxylic acid or ester thereof monomer {5}
557.~.~.~.~.~ Polyvinyl alcohol or modified forms thereof

DEFINITION

Classification: 524/557

Polyvinyl alcohol or modified forms thereof:

(under subclass 556) Subject matter wherein the solid polymer derived from a carboxylic or derivative is modified so as to produce polyvinyl alcohol.

(1) Note. See Class 525, subclass 56 for a definition of the term "polyvinyl alcohol".

(2) Note. The polyvinyl alcohol may be added to the NRM or may be produced subsequently to the addition of the NRM to the solid polymer.