Inkjet ink receptive coating comprising esterified or etherified starch and laponite

Patent metadata

Field	Value
Publication number	US-11396199-B2
Application number	US-201615560242-A
Country	US
Kind code	B2
Filing date	Mar 23, 2016
Priority date	Mar 23, 2015
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

A method of manufacturing a paper or paperboard with improved printing properties, which method comprises the steps of, providing a paper or paperboard substrate, comprising cellulosic fibres, providing a coating composition comprising a mixture of an esterified or etherified starch and a inorganic mineral; and coating at least one surface of said substrate with at least one layer of said coating composition.

First claim

The invention claimed is:

1. A method of manufacturing a paper or paperboard with improved printing properties, which method comprises the steps of;
providing a paper or paperboard substrate, comprising cellulosic fibres;
providing a coating composition consisting of a solvent, an esterified or etherified starch, and an inorganic mineral wherein the inorganic mineral comprises Laponite, wherein the esterified or etherified starch is selected from the group consisting of hydroxypropylated starch, hydroxyethyl starch, or combinations or modifications of any of these; and
forming an ink receptive coating on said substrate by coating at least one surface of said substrate with at least one layer of said coating composition,
wherein a proportion of said Laponite in said coating composition, relative to the esterified or etherified starch, is less than 50% (pph).

2. The method according to claim 1 , wherein the esterified or etherified starch is hydroxypropylated starch.

3. The method according to claim 1 , wherein the coating is applied as a single layer coating or multiple layer coating.

4. The method according to claim 3 , wherein when the coating is applied as multiple layer coating the coating layers may be the same or different.

5. The method according to claim 1 , wherein the coat weight of the at least one coating layer is in the range of 3 to 12 g/m 2 .

6. A packaging or paper product produced according to the method of claim 1 .

7. A packaging or paper product according to claim 6 , wherein the product is suitable for ink jet printing.

8. The method according to claim 1 , wherein the coat weight of the at least one coating layer is in the range of 5 to 10 g/m 2 .

9. The method according to claim 1 , wherein the proportion of said Laponite is less than 30% (pph) of the esterified or etherified starch.

Assignees

• Stora Enso Oyj

Inventors

• Backfolk Kaj
• Mielonen Katriina
• Ovaska Sami

Classifications

• D21H19/80

  Paper comprising more than one coating (D21H19/02 takes precedence) · CPC title

• D21H17/68

  siliceous, e.g. clays · CPC title

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title

• D21H27/10

  Packing paper (packaging materials of special type or form B65D65/38) · CPC title

• B41M5/508

  Supports · CPC title