US PATENT SUBCLASS 525 / 56
.~.~.~ 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.~.~.~ Polyvinyl alcohol {6}
57  DF  .~.~.~.~> With solid polymer derived from ethylenic reactants only
58  DF  .~.~.~.~> With SICP, SPFI, or polymer thereof
59  DF  .~.~.~.~> With ethylenic reactant
60  DF  .~.~.~.~> Interpolymers
61  DF  .~.~.~.~> Chemical modification utilizing a chemical treating agent
62  DF  .~.~.~.~> Processes only of preparing polyvinyl alcohol

DEFINITION

Classification: 525/56

Polyvinyl alcohol:

(under subclass 55) Subject matter involves polymeric products containing vinyl alcohol units, processes of preparing wherein the final desired product is a polymer containing vinyl alcohol units; composition of a polymer containing vinyl alcohol units and a solid polymer, specified polymer-forming ingredients, a specified intermediate condensation product, chemically reactive material, or ethylenic reactant; or processes of preparing such a composition; composition of a precursor polymer and a reactive material which, under disclosed conditions, will prepare a vinyl alcohol polymer and processes of preparing such a composition.

(1) Note. A vinyl alcohol-containing polymer requires at least three CH2-H groups in the polymeric chain.

(2) Note. Vinyl alcohol polymers for the most part herein are prepared by the partial hydrolysis or saponification of polymers of vinyl esters, particularly homo- or interpolymeric-vinyl acetate. Any subsequent chemical treatment to polyvinyl alcohol will be assumed to have left unreacted alcohol groups. For this reason, polymers such as polyvinyl acetal, polyvinyl butyral, etc., will be found here.

(3) Note. Claims to a polymer admixed with a chemically reactive material or the process of preparing such a composition are classified in this area as if the actual process has gone to completion. As such, these types of claims are classified in the appropriate indented process area, rather than on the basis of the final treated product.

SEE OR SEARCH CLASS

526, Synthetic Resins or Natural Rubbers, and in particular,

202, for a process of polymerizing an ethylenic monomer in the presence of a vinyl alcohol polymer wherein there is no intent to react the vinyl alcohol polymer with the polymerizable monomer or to form a composition therewith.

528, Synthetic Resins or Natural Rubbers, 480+, for processes involving the treatment of a vinyl alcohol polymer-containing material, without destroying the integrity of the polymer.