Fluorocarbon-free and bio-derived oil and water barrier materials containing polymer electrolyte composites

Abstract

To provide compositions of hydrophilic biomaterials that can form several layers on fiber-based materials so that the layers can act synergistically to improve both oil and water barrier capacity of the material with its applied layers.SOLUTION: There is provided an aqueous polyelectrolyte (PEC) composition for application to a fiber-based material for the use of obtaining a barrier coating resistant to oil and water, wherein the composition comprises: (a) from 0.1 to 20% (w / w) of carboxymethyl cellulose (CMC) and from 0.1 to 20% of cationic starch (CS); (b) from 1 to 20% (w / w) of a plasticizer; and (c) from 1 to 15% (w / w) of a pH adjusting agent selected from an acid, a buffering system and a base, and the composition has charge ratio that is equal to or less than 1.SELECTED DRAWING: None

Claims

1. (a) A polymer electrolyte complex (PEC) with a charge ratio of 1 or less, comprising 1-5% (weight / weight) carboxymethylcellulose (CMC) and 5-20% cationic starch (CS), (b) 1-20% (by weight / by weight) of plasticizer, (c) an aqueous polymer electrolyte composite composition for application to fibrous materials, comprising 1-15% (by weight / by weight) of a pH adjusting agent which is a buffer system consisting of an acid-base pair, for use in obtaining an oil and water resistant barrier coating.

2. The composition according to claim 1, wherein the plasticizer is sorbitol.

3. The composition according to claim 1, wherein the acid-base pair is a corresponding acid-base pair derived from an organic acid.

4. The composition according to claim 1, wherein the buffer system is selected from citric acid and the corresponding salt of citric acid, and lactic acid and the corresponding salt of lactic acid.

5. The composition according to claim 1, comprising equal amounts (by weight / by weight) of citric acid and tribasic citrate.

6. The composition according to claim 1, wherein the pH value is 3 to 6.

7. Ammonium zirconium carbonate; preservative; antifoaming agent; foaming agent; wetting agent; coalescent agents; catalyst; surfactant; emulsifier; crosslinking agent; rheological modifier; filler The composition according to claim 1, comprising an additive selected from at least one of: a nonionic polymer; dyes and pigments.

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