Water resistant and repulpable compositions
Disclosed herein is a printable paper comprising a cellulose-based substrate having a first surface and a second surface opposite the first surface, wherein the printable paper has a 2-minute Cobb sizing value of less than 20 g/m 2 , and wherein the first surface, the second surface, or both has a surface energy of greater than 37 dynes/cm. Further disclosed herein are shipping mailers, such as those derived from the printable papers, and recyclable flexible packaging containers, such as those comprising the printable papers. A method of making a recyclable flexible packaging container is also disclosed herein.
1 . A printable paper, comprising:
a cellulose-based substrate having a first surface and a second surface opposite the first surface,
a printable barrier coating on the first surface of the cellulose-based substrate, the printable barrier coating derived from an aqueous-based polymer comprising an acrylic homopolymer, an acrylic copolymer, a polyester acrylic copolymer, a vinyl acrylic copolymer, a wax emulsion, or a combination thereof, wherein the printable barrier coating has been surface treated with a high energy discharge; and
a backside coating on the second surface of the cellulose-based substrate that is different than the printable barrier coating comprising a film-forming polymer,
wherein the printable paper has a 2-minute Cobb Sizing value of less than 20 g/m 2 , and
wherein the first surface has a surface energy of greater than 37 dynes/cm.
2 . The printable paper of claim 1 , exhibiting a tensile strength (MD) of at least 45 lb f /in, as determined by TAPPI T 494.
3 . The printable paper of claim 1 , having a basis weight of from 60 lbs/3000 ft 2 to 120 lbs/3000 ft 2 .
4 . The printable paper of claim 1 , wherein the printable paper has a 2-minute Cobb Sizing value of less than 15 g/m 2 .
5 . The printable paper of claim 1 , wherein the first surface, the second surface, or both has a surface energy of from 40 dynes/cm to 45 dynes/cm.
6 . The printable paper according to claim 1 , wherein the printable paper exhibits a tensile energy absorption (MD) of at least 200 J/m 2 , as determined by TAPPI T 494.
7 . The printable paper according to claim 1 , wherein the printable paper exhibits a tear resistance (MD) of at least 170 gf, as determined by TAPPI T 414.
8 . The printable paper according to claim 1 , wherein the printable barrier coating has been surface treated using corona treatment.
9 . The printable paper according to claim 1 , wherein the printable barrier coating has a coating weight from 2 g/m 2 to 20 g/m 2 .
10 . The printable paper according to claim 1 , wherein the tensile index (MD) as defined by dividing the tensile strength in N/m by the basis weight in g/m 2 is from 70 to 95 Nm/g.
11 . The printable paper according to claim 1 , wherein the film-forming polymer in the backside coating comprises polyvinyl alcohol (PVOH), polyvinylamine, alginate, a polyester elastomer, a natural-based polymer, or a mixture thereof.
12 . The printable paper of claim 1 , exhibiting a tensile strength (MD) of at least 70 lb f /in, as determined by TAPPI T 494.
13 . The printable paper according to claim 1 , wherein the cellulose-based substrate includes dry strength additives.
14 . The printable paper according to claim 13 , wherein the dry strength additives include a cationic starch and a polyacrylamide resin.
15 . The printable paper according to claim 1 , wherein the printable barrier coating further comprises an inorganic particle.
16 . The printable paper according to claim 15 , wherein the inorganic particle is surface treated.
17 . The printable paper according to claim 15 , wherein the inorganic particle includes silica.