Coating of hydroxylated surfaces by gas phase grafting
AssigneeCarlsberg A/S
InventorsMorten Meldal, Manat Renil, Steen Vesborg
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Abstract
A method of coating hydroxylated surfaces by gas phase grafting is described. Especially acyl groups, silyl groups and/or alkyl groups are located on the surface of materials by gas phase grafting. The grafting method is a dry process. The material to coat can be organic or inorganic materials. The produced surface coated material are strong and durable and material normally not water-proof can be water-proof due to the surface treating. Examples of items produced from surface treated material may be water-proof cardboard boxes, other containers, furniture, interior for cars and boats. Items produced from organic materials such as from plant parts are biodegradable.
Claims15
A method for coating a material with at least one acylation reagent to provide acyl group(s) at the surface of the material, wherein said method is a dry process and wherein said method comprises the steps of:
- a) providing a material consisting of milled plant fiber, wherein the milled plant fiber comprises lignin and hemicellulose,
- b) providing at least one acylation reagent, selected from the group consisting of compounds of the formula:
- wherein X is selected from the group consisting of
- a halogen,
- a mixed carbonic anhydride, and
- a mixed anhydride,
- wherein R1, R2 and R3 of the acylation reagent are H, C1-3-alkyl, or C1-3-alkenyl;
- and n=0-3,
- c) contacting said material consisting of milled plant fiber, wherein the milled plant fiber comprises lignin and hemicellulose with said acylation reagent, wherein said reagent is kept in gas phase, and
- d) obtaining a coated material which at the surface comprises covalently —O-linked residues comprising an acyl group.
Dependencies are inferred from the claim text.