Back to results
US 12,269,242 B2Granted
Enhanced PVOH-based barrier layer composition, barrier layer and methods for its manufacture
AssigneeBillerudkorsnas AB
InventorAli Naderi
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeBillerudkorsnas AB
InventorAli Naderi
Estimating the term…
There is provided a packaging material comprising a fibre based substrate and a gas barrier layer based on a polyvinyl alcohol (PVOH), wherein said gas barrier layer comprises an interpolymer complex forming agent (IPCFA), which IPCFA is a water-soluble polymer exhibiting functional groups capable of forming hydrogen bonds with —OH groups of the PVOH. Said PVOH has a weight average molecular weight (Mw) measured according to ASTM D4001-13 in the range of about 80 kg/mol to 135 kg/mol, the proportion of said IPCFA to PVOH in said gas barrier layer is in the range of 0.5 to 7.0% (w/w) and said packaging material has an oxygen permeability (OP) below 14 ml μm/m2 day atm, which OP is obtained by multiplying the oxygen transmission rate (OTR) of the packaging material measured according to ASTM F1927-7 at a relative humidity (RH) of 80% and 23° C. by the thickness of the gas barrier layer.
A packaging material comprising a fiber based substrate and a gas barrier layer based on a polyvinyl alcohol (PVOH), wherein said gas barrier layer comprises an interpolymer complex forming agent (IPCFA), which IPCFA is a water-soluble polymer exhibiting functional groups capable of forming hydrogen bonds with —OH groups of the PVOH, wherein said PVOH has a weight average molecular weight (Mw) measured according to ASTM D4001-13 in a range of 80 kg/mol to 135 kg/mol, a proportion of said IPCFA to PVOH in said gas barrier layer is in a range of 0.5 to 7.0% (w/w) and said packaging material having an oxygen transmission rate and an oxygen permeability (OP) below 14 ml μm/m2 day atm, which OP is obtained by multiplying the oxygen transmission rate (OTR) of the packaging material measured according to ASTM F1927-7 at a relative humidity (RH) of 80% and 23° C. by the thickness of the gas barrier layer.
Dependencies are inferred from the claim text.