Layered body having porous layer, and inkjet paper

Patent metadata

Field	Value
Publication number	US-11701913-B2
Application number	US-202117923047-A
Country	US
Kind code	B2
Filing date	May 24, 2021
Priority date	May 25, 2020
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

Provided is a laminate having a porous layer that can ensure the drying property of a printing ink and can also be produced with less gum residue generated. A laminate comprising a substrate layer (A) and a porous layer (B), wherein the porous layer (B) comprises a thermoplastic resin and a filler, the filler comprises a filler having a hydrophobized surface, as a part thereof, and the porous layer (B) has a liquid-absorptive capacity of 10 to 40 cc/m2 as measured in accordance with JIS P 8140:1998 with a 70 mass % ethanol aqueous solution.

First claim

The invention claimed is:

1. A laminate comprising a substrate layer (A) and a porous layer (B), wherein
the porous layer (B) comprises a thermoplastic resin and a filler,
the filler comprises a filler having a hydrophobized surface, as a part thereof, and
the porous layer (B) has a liquid-absorptive capacity of 10 to 40 cc/m 2 as measured in accordance with JIS P 8140:1998 with a 70 mass % ethanol aqueous solution.

2. The laminate according to claim 1 , wherein the filler having a hydrophobized surface is inorganic particles or organic particles having a surface treated with paraffin or a fatty acid having 12 to 22 carbon atoms or a salt thereof.

3. The laminate according to claim 1 , wherein the porous layer (B) has a first porous sub-layer (B 1 ) and a second porous sub-layer (B 2 ),
the substrate layer (A), the second porous sub-layer (B 2 ), and the first porous sub-layer (B 1 ) are layered in this order,
a content of a whole of the filler in the first porous sub-layer (B 1 ), C W1 (mass %), and a content of the filler having a hydrophobized surface in the first porous sub-layer (B 1 ), C H1 (mass %), satisfy an expression (a1) and an expression (b1) below, and
a content of a whole of the filler in the second porous sub-layer (B 2 ), C W2 (mass %), and a content of the filler having a hydrophobized surface in the second porous sub-layer (B 2 ), C H2 (mass %), satisfy an expression (a2) and an expression (b2) below:
50≤ C W1 ≤75  (a1)

30≤ C H1 ≤75  (b1)

50≤ C W2 ≤75  (a2)

0≤ C H2 ≤15  (b2).

4. The laminate according to claim 3 , wherein the first porous sub-layer (B 1 ) has a grammage of 0.5 to 10 g/m 2 .

5. The laminate according to claim 3 , wherein the second porous sub-layer (B 2 ) has a grammage of 4 g/m 2 or more.

6. The laminate according to claim 3 , wherein the thermoplastic resin contained in the porous layer (B) comprises a propylene-based polymer.

7. The laminate according to claim 6 , wherein the thermoplastic resin contained in the porous layer (B) further comprises an ethylene-based polymer and an acid-modified polypropylene.

8. The laminate according to claim 3 , wherein the porous layer (B) further has a formation-supporting layer (B 3 ), and
the substrate layer (A), the formation-supporting layer (B 3 ), the second porous sub-layer (B 2 ), and the first porous sub-layer (B 1 ) are layered in this order.

9. The laminate according to claim 1 , wherein the porous layer (B) is a porous layer (B 4 ) satisfying expressions (a4), (b4), and (c4) below:
50< C W ≤75  (a4)

30≤ C H   (b4)

C H ≤4 C W /5  (c4)

wherein C W represents a content (mass %) of a whole of the filler in the porous layer (B 4 ), and C H represents a content (mass %) of the filler having a hydrophobized surface in the porous layer (B 4 ).

10. The laminate according to claim 9 , wherein the thermoplastic resin contained in the porous layer (B 4 ) comprises a propylene-based polymer.

11. The laminate according to claim 9 , wherein the thermoplastic resin contained in the porous layer (B 4 ) further comprises an ethylene-based polymer and an acid-modified polypropylene.

12. The laminate according to claim 1 , wherein the porous layer (B) is a layer formed through an extrusion process.

13. The laminate according to claim 1 , wherein the laminate has a coating layer comprising a cationic polymer on a surface of the porous layer (B).

14. Ink jet printable paper comprising the laminate according to claim 1 .

Assignees

• Yupo Corp

Inventors

• TAJIRI Hirokazu
• Kikuchi Daisuke
• Zama Takahiro

Classifications

• B41M5/5254 Primary

  characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers · CPC title

• B32B27/08

  of synthetic resin · CPC title

• B32B27/20

  using fillers, pigments, thixotroping agents · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B41M5/506

  Intermediate layers · CPC title