US PATENT SUBCLASS 536 / 85
.~.~.~.~ Subsequent treatment process

Current as of: June, 1999
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536 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1.11  DF  .~ Carbohydrates or derivatives {15}
56  DF  .~.~ Cellulose or derivative {4}
84  DF  .~.~.~ Ethers {7}
85.~.~.~.~ Subsequent treatment process {4}
86  DF  .~.~.~.~.~> Comminuting
87  DF  .~.~.~.~.~> Liquid interaction properties changed (e.g., solubility, absorbability, etc.)
88  DF  .~.~.~.~.~> Viscosity, degree of polymerization or heat stability changed (e.g., degrading, cross-linking, etc.)
89  DF  .~.~.~.~.~> Acid employed in subsequent treatment

DEFINITION

Classification: 536/85

(under subclass 84) Processes in which a cellulose ether is purified, recovered, separated, altered physically; or treated chemically wherein the primary intent is merely to modify a property of the cellulose ether.

(1) Note. The processes herein may combine producing the cellulose ether with a subsequent treatment or may merely treat an already formed cellulose ether.

(2) Note. This subclass does not generally provide for processes wherein the intent is to make a derivative of the cellulose ether. However, cross-linking processes are included here as well as processes wherein the purpose is merely to modify a property of the cellulose ether, even when some derivatizing occurs.

SEE OR SEARCH THIS CLASS, SUBCLASS:

43, for subsequent treatment of nitrogen containing cellulose ether derivatives.