US PATENT SUBCLASS 521 / 141
.~.~ Cellular vinyl alcohol polymer

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
141.~.~ Cellular vinyl alcohol polymer

DEFINITION

Classification: 521/141

Cellular vinyl alcohol polymer:

(under subclass 50) Subject matter involving a cellular polymer derived from vinyl alcohol or process of preparing; composition containing a vinyl alcohol polymer and which composition is capable of forming a cellular product or processes of preparing same; processes of treating a cellular polymer derived from a vinyl alcohol polymer with a material which neither reacts with the cellular polymer to change or modify chemical bonds therein or neither forms a desired composition with the cellular polymer; or products of such a treatment; processes of treating a cellular polymer derived from a vinyl alcohol containing polymer without the addition of a material thereto whereby a physical or chemical change in the polymer may be effected or products which are the result of such treatment.

(1) Note. A vinyl alcohol containing polymer requires at least 3 () groups in the polymeric molecule.

(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 interpolymerized vinyl acetate).

SEE OR SEARCH THIS CLASS, SUBCLASS:

53+, for a process of treating a cellular polymer with a material so as to modify or change chemical bonds in the cellular polymer or wherein a material is added to a cellular polymer to form a derived composition therewith, or for cellular products which are the result of such a treating process.