Process for producing fibrous material with antimicrobial properties
The application relates to a process for producing fibrous material with antimicrobial properties, wherein in the first step coniferous resin acid composition is emulsified into aqueous solution with emulsifier and wetting agent, and in the second step thus formed emulsion is transferred into fibrous material by impregnation. Further, the application relates to an aqueous antimicrobial composition for use as a water-soluble concentrate in the treatment of fibrous materials, and to a fibrous material with antimicrobial properties, and to its use in e.g. fabrics, fur, leather, clothes, canvas, tissues, plastics, webs, accessories, packaging materials, wallpapers, food-related products, household products, footwear, construction materials, insulating materials and medical products.
1. A process for producing fibrous material with antimicrobial properties, comprising the following steps:
I) emulsifying coniferous resin acid composition into aqueous solution with emulsifier and wetting agent, wherein
a) the emulsifier is selected from C10-C18 alpha olefins, and the coniferous resin acid composition is first dissolved in solvent selected from E-series glycol ethers, ethylene glycol monomethyl ether (2-methoxyethanol), ethylene glycol monoethyl ether (2-ethoxyethanol), ethylene glycol monopropyl ether (2-propoxyethanol), ethylene glycol monoisopropyl ether (2-isopropxyethanol), ethylene glycol monobutyl ether (2-butoxyethanol), ethylene glycol monophenyl ether (2-phenoxyethanol), ethylene glycol monobenzyl ether (2-benzyloxyethanol), diethylene glycol monomethyl ether (2-(2-methoxyethoxy)ethanol, (methyl carbitol), diethylene glycol monoethyl ether (2-(2-ethoxyethoxy)ethanol, carbitol cellosolve), diethylene glycol mono-n-butyl ether (2-(2-butoxyethoxy)ethanol, butyl carbitol), P-series glycol ethers, dipropylene glycol methyl ether, dipropylene glycol methyl ether acetate, dipropylene glycol n-butyl ether, dipropylene glycol n-propyl ether, propylene glycol diacetate, propylene glycol methyl ether, propylene glycol methyl ether acetate, propylene glycol n-butyl ether, propylene glycol n-propyl ether, propylene glycol phenyl ether, tripropylene glycol methyl ether, tripopylene glycol n-butyl ether, dipropylene glycol dimethyl ether or mixtures thereof, or
b) the emulsifier is selected from ethoxylated aliphatic amines having a degree of ethoxylation ranging from 2 to 15 moles, and the coniferous resin acid composition is first dissolved in isopropanol, and
II) transferring the thus formed emulsion into fibrous material by impregnation,
wherein the emulsion comprises coniferous resin acids in an amount of 4000 ppm to 40000 ppm, and
in a) the amount of emulsifier is 30 w-% to 70 w-% and the amount of solvent is 10 w-% to 30 w-%, or
in b) the amount of emulsifier is 0.5 w-% to 5 w-% and the amount of isopropanol is 8 w-% to 15 w-%.
2. The process according to claim 1 , wherein in step II) the impregnation comprises transferring the emulsion into fibrous material by immersion, spraying, coating, dipping or during air or wet laid web formation.
3. The process according to claim 1 , wherein the process further comprises step III) after-treating the fibrous material to form a finished product.
4. The process according to claim 3 , wherein in step III) the after-treating comprises evaporating the solvent by drying the fibrous material at ambient temperature or at 20 to 180° C. for 1 to 120 minutes and washing the fibrous material with water to remove the emulsifier.
5. The process according to claim 1 , wherein the emulsifier in step I) serves as both an emulsifier and a wetting agent.
6. The process according to claim 1 , wherein step I) comprises a wetting agent selected from amine oxides.
7. The process according to claim 1 , wherein a pH regulator is added in step I).
8. The process according to claim 1 , wherein in step I) the coniferous resin acid composition comprises at least 70-80 wt-% of resin/rosin acids, of which >90 wt-% are free resin/rosin acids.
9. The process according to claim 1 , wherein in step II) the impregnation is performed in a suitable solvent for a time sufficient to enable adhesion of the antimicrobial agent into fibrous material.
10. The process according to claim 1 , wherein in step I) the emulsifier is selected from C12-C16 alpha olefins.