US 12,030,331 B2
Print-medium paper and method
Federico Asensio Balet, Saragossa (ES); Alberto Mena Diaz De Corcuera, Saragossa (ES); and Diego Compaired Turlan, Saragossa (ES)
Assigned to SAICA, S.A. INDUSTRIAS CELULOSA ARAGONESA, Saragossa (ES)
Appl. No. 17/424,860
Filed by SAICA, S.A. INDUSTRIAS CELULOSA ARAGONESA, Saragossa (ES)
PCT Filed Jan. 24, 2020, PCT No. PCT/IB2020/000045
§ 371(c)(1), (2) Date Jul. 21, 2021,
PCT Pub. No. WO2020/152531, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 19382052 (EP), filed on Jan. 25, 2019.
Prior Publication US 2021/0348337 A1, Nov. 11, 2021
Int. Cl. B41M 5/52 (2006.01)
CPC B41M 5/5218 (2013.01) [B41M 5/52 (2013.01); B41M 5/5245 (2013.01); B41M 5/5254 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A print-medium paper suitable to be printed directly in a digital printer, without the need of the application of a primmer or a bonding agent prior to or on color printing or suitable to be printed in a flexographic printer without the need of a dryer on or after color printing devices comprising
a base paper (3) and
at least one external layer or top white side (4):
characterized in that the base paper (3) is containerboard grade made out of 60% to 100% recycled fibers suitable to be used in corrugated board products treated with styrene acrylate based product as a synthetic sizing agent, and in that the external layer or top white side (4) comprises
a first coating layer (2) that comprises
anionic ground calcium carbonate as a mineral particle with
a monomodal pore size distribution,
a volume defined pore size polydispersity expressed as full width at half maximum (FWHM) from 40 to 80 nm, and
a volume defined median pore diameter from 30 to 80 nm,
titanium dioxide as a mineral particle
styrene butadiene latex as a hydrophobic binder
non-ionic polyvinyl alcohol as a hydrophilic binder
at least one rheology modifier
at least one surfactant,
a second coating layer (1) applied once the first coating layer (2) is dried that comprises
anionic ground calcium carbonate comprising a dispersing agent
non-ionic polyvinyl alcohol as a first hydrophilic binder
carboxymethylcullose as second hydrophilic binder
styrene butadiene latex, comprising a dispersing agent, as a hydrophobic binder
polydiallyldimethylammonium chloride (PolyDadmac) as a cationic polymer
Calcium chloride as a wetting agent and viscosity modifier.