Method
AssigneePa Knowledge Limited
InventorsRodney Edward SMITH, Craig Harvey NELSON, William Frank TYLDESLEY, Stuart Michael Ruan JONES
Life of this patent
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Abstract
A method of barrier coating a porous substrate, the method comprising: coating a surface of the substrate with an intermediate layer, said intermediate layer filling pores at the surface of the substrate; and coating the intermediate layer with a non-polymer barrier layer.
Claims25
A method of barrier coating a porous substrate, the method comprising:
- coating a surface of the substrate with an intermediate layer, said intermediate layer filling pores at the surface of the substrate;
- and
- coating the intermediate layer with a non-polymer barrier layer.
The method of any preceding claim, wherein the average pore size of the substrate is no more than 500 um and/or no less than 1 nm.
The method of any preceding claim, wherein the average pore size after coating the substrate with the intermediate layer is less than 100 nm.
The method of any preceding claim, further comprising treating the intermediate layer before coating with the barrier layer, said treatment configured to improve adhesion of the barrier layer.
The method of any preceding claim, wherein the intermediate layer has a thickness of no more than 100 um and/or no less than 10 nm.
The method of any preceding claim, wherein the intermediate layer is formed from a material substantially comprising at least one of:
- a biopolymer, such as PLA, PCL and PBS, a starch, PVOH, EVOH, Pullulan, BVOH, a natural wax, such as rape seed wax, a natural resin, such as pine resin, and a cellulosic material, such as microfibrous cellulose.
The method of any preceding claim, wherein the intermediate layer is applied to the substrate as a fluid.
The method of claim 16, wherein the fluid is an aqueous solution, suspension, gel, dispersion or colloid.
The method of any preceding claim, wherein the intermediate layer is applied to the substrate by at least one of:
- printing, dipping, spraying, blade-coating, vapour or gaseous coating and chemical vapour deposition.
The method of any preceding claim, wherein the barrier layer is substantially formed from at least one of:
- aluminium, aluminium oxide (AlOx), and silicon oxide (SiOx).
The method of any preceding claim wherein the barrier layer has a thickness of no more than 500 nm.
The method of any preceding claim wherein the barrier layer has a thickness of no more than 50 nm and/or no less than 5 nm.
The method of any preceding claim, wherein the barrier layer is applied by vacuum deposition, such as thermal evaporation, reactive thermal evaporation or sputtering.
A barrier material comprising:
- a porous substrate;
- intermediate layer coating the substrate and filling pores at the surface of the substrate;
- a non-polymer barrier layer coating the intermediate layer.
Dependencies are inferred from the claim text.