Methods for Biodegradable Derivatization of Cellulosic Surfaces
AssigneeYagna Limited
InventorGiussepe Trigiante
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Abstract
The present invention describes methods of treating cellulosic materials with a composition that provides increased hydrophobicity to such materials without sacrificing the biodegradability thereof. The methods as disclosed provide for esterification of available hydroxyl groups on cellulosic materials, where such hydroxyl groups are “masked” by bulky organic chains, including that the disclosure provides products made by such methods. The materials thus treated display higher hydrophobicity, barrier function, and mechanical properties, and may be used in any application where such features are desired.
Claims26
A method for treating a surface of a cellulose-containing material comprising:
- applying to said surface a composition comprising:
- an alkanoic acid derivative having the formula (I) or formula (II):
- R—CO—X Formula (I)
- X—CO—R—CO—X1(II) Formula (II),
- wherein R is a straight-chain, branched-chain, or cyclic aliphatic hydrocarbon radical having from 6 to 50 carbon atoms, and wherein X and X1 are independently Cl, Br, or O(CO)OR,
- a base, and
- a first solvent;
- heating the applied composition on said surface;
- rinsing said surface with a second solvent;
- and
- drying said rinsed surface,
- wherein said composition esterifies at least a portion of the hydroxyl groups available via the cellulose of the material.
A method for treating a surface of a cellulose-containing material comprising:
- applying to said surface a composition comprising:
- a derivatizing agent selected from the group consisting of acid chlorides, acid bromides, acid iodides, anhydrides, ketenes, diketenes, chlorocarbolic acid esters, carbonic acid diesters, 2,5-diketooxazolidines, isatinic anhydride, isocyanates, carbamoyl chlorides, thiocyanates, thiocarbamoyl chlorides, sulfonyl chlorides, sulfonic acid anhydrides, N-chlorosulfonamides, sulfinic acid chlorides, N-chlorosulfinamides, and combinations thereof;
- a base, and
- a first solvent;
- heating the applied composition on said surface;
- rinsing said surface with a second solvent;
- and
- drying said rinsed surface,
- wherein the resulting surface of the cellulose-based material exhibits a water contact angle of about 100°.
A method for treating a surface of a cellulose-containing material comprising:
- applying to said surface a composition comprising:
- an alkanoic acid derivative having the formula (I) or formula (II):
- R—CO—X Formula (I)
- X—CO—R—CO—X1 Formula (II),
- wherein R is a straight-chain, branched-chain, or cyclic aliphatic hydrocarbon radical having from 6 to 50 carbon atoms, and wherein X and X1 are independently Cl, Br, or O(CO)OR;
- a base, and
- a first solvent,
- heating the applied composition on said surface;
- rinsing said surface with a second solvent;
- and
- drying said rinsed surface,
- wherein the resulting treated cellulose-containing material exhibits properties selected from the group consisting of a water contact angle of about 100°, is stable up to at least about 200° C., an oxygen permeability of less than about 10 Barrer units, a water vapour permeability of less than about 20 Barrer units, contains hydroxyl groups esterified on the surface of the cellulose-containing material is greater than about 40%, and combinations thereof.
Dependencies are inferred from the claim text.