Barrier-coated cellulose-based substrate

Barrier-coated cellulose-based substrate as claimed in any one of the preceding claims, wherein the ductile base layer pre-coating (12a;

• 12b) is made from an aqueous composition comprising a polymer binder material having inherent ductility properties selected from the group consisting of styrene-butadiene copolymer (SB) latex, styrene acrylate copolymer (SA) latex, other latexes of acrylate polymers and copolymers, such as vinyl acrylic copolymer latex and vinyl acetate acrylate copolymer latex, and of bio-based polymer materials.

Barrier-coated cellulose-based substrate as claimed in any one of the preceding claims, wherein the ductile base layer pre-coating (12a;

• 12b) is made from an aqueous composition comprising a bio-based polymer binder material having inherent ductility properties selected from the group comprising starch derivatives, polyisoprene, lignin-based polymers, alginates, gums, and soy-based proteins and latexes of one or more such bio-based polymer binder material.

Barrier-coated cellulose-based substrate as claimed claim 46, wherein the ductile base layer pre-coating (12a;

• 12b) comprises from 4 to 45 wt %, such as from 4 to 35 wt %, such as from 4 to 25 wt %, such as from 4 to 20 wt %, such as from 4 to 16 wt % of the polymer binder material having inherent ductility properties, and from 55 to 96 wt %, such as from 65 to 96 wt %, such as from 75 to 96 wt %, such as from 80 to 96 wt % of a filler material, dry weight, and optionally further compounds, such as thickening agents and crosslinking compounds, at additive amounts.

Barrier-coated cellulose-based substrate (10a;

• 10b) as claimed in any one of the preceding claims, wherein the cellulose-based substrate has a second ductile coating (15a;
• 15b) on its opposite side, such as of the same composition as the ductile base layer pre-coating (12a;
• 12b).

Barrier-coated cellulose-based substrate as claimed in any one of the preceding claims, wherein the cellulose-based substrate including the ductile base layer pre-coating (12a;12b), is calendered to an air permeance value lower than 100 nm/(Pa·s) which is the lower limit of applicability of the test method ISO 5636-5:2013, and further lower than 1 nm, such as from 40 to 900 pm/(Pa·s), such as from 40 to 800 pm/(Pa·s), such as from 100 to 700 pm/(Pa·s), such as from 200 to 500 pm/(Pa·s), as determined by SCAN-P 26:78.

Barrier-coated cellulose-based substrate (10a;

• 10b) as claimed in any one of the preceding claims, wherein the cellulose-based substrate including the ductile base layer pre-coating (12a;
• 12b) and the at least one gas barrier coating (13a, 14a;14b), has a PPS surface roughness lower than 3.0 μm, such as lower than 2.8 μm, such as lower than 2.5 μm, such as lower than 2.2 μm, such as lower than 2.0 μm, such as 1.8 μm or below, as measured according to TAPPI 555 om-15, being the same as ISO 8791-4.

Barrier-coated cellulose-based substrate as claimed in any one of the preceding claims, wherein the cellulose-based substrate comprises at least 50 wt %, such as from 60 to 100 wt %, such as from 70 to 100 wt % softwood cellulose, such as Kraft softwood cellulose.