Coating color composition and paper or paperboard coated with it

Patent metadata

Field	Value
Publication number	US-9410289-B2
Application number	US-49362609-A
Country	US
Kind code	B2
Filing date	Jun 29, 2009
Priority date	Dec 18, 2008
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The invention relates to a coating color composition for paper and/or paperboard comprising a pigment, optionally known additives used in coating compositions, and a binder substitute comprising styrene acrylate copolymer having mean particle size ≦100 nm. The invention also relates to paper or paperboard coated with a coating color composition according to the invention.

First claim

The invention claimed is:

1. An aqueous color composition for paper and/or paperboard having a solids content of 60-74 wt. % and consisting of:
a pigment selected from the group consisting of calcium carbonate, kaolin, calcinated kaolin, talc, titanium dioxide, gypsum, chalk, satine white, barium sulphate, sodium aluminium silicate, aluminium hydroxide and any mixture thereof,
optionally starch and/or known additives used in coating compositions selected from the group consisting of preservatives, dispersing agents, defoaming agents, lubricants, hardeners, optical brighteners, and a combination thereof,- optionally a latex binder selected from the group consisting of styrene butadiene (SB), styrene acrylate (SA), polyvinyl acetate (PVAc) latex, and any combination thereof,
a binder substitute, wherein the binder substitute is a styrene acrylate copolymer comprising a starch having a mean particle size less than 80 nm and obtained by copolymerization of ethylenically unsaturated monomer in the presence of a starch having an amylopectin content >80 wt. % and an intrinsic viscosity from 0.05 to 0.12 dl/g, and
water.

2. The coating color composition according to claim 1 , wherein the mean particle size of the binder substitute is 40-70 nm.

3. The coating color composition according to claim 1 , wherein the latex binder is styrene butadiene latex.

4. The coating color composition according to claim 1 , wherein an amount of the pigment, latex binder, binder substitute and known additives is as follows:
100 parts of total pigment,
greater than 0 to 12 parts of the latex binder,
1.5- 9 parts of the binder substitute, and
0- 3 parts of known additives, provided that a total amount of the latex binder and the binder substitute is at least 5 parts.

5. The coating color composition according to claim 1 , wherein an amount of the pigment, starch, latex binder, styrene binder substitute and known additives is as follows :
100 parts of total pigment,
4- 12 parts of starch,
3- 6 parts of the latex binder,
2- 4 parts of the styrene binder substitute, and
0- 3 parts of known additives.

6. The coating color composition according to claim 1 , wherein an amount of the pigment, latex binder, binder substitute and known additives is as follows :
100 parts of total pigment,
4- 5 parts of the latex binder,
2- 3 parts of the binder substitute, and
0- 3 parts of known additives.

7. The coating color composition according to claim 1 , wherein the coating color composition has a solids content of 63-72 wt. %.

8. Paper or paperboard coated with a coating color composition according to claim 1 .

Assignees

• Ahlgren Jonni
• Matula Antti
• Turkki Tarja
• Kemira Oyj

Inventors

• Ahlgren Jonni
• Matula Antti
• Turkki Tarja

Classifications

• Y10T428/31906

  Ester, halide or nitrile of addition polymer · CPC title

• C09D125/14

  with unsaturated esters · CPC title

• D21H19/54

  Starch · CPC title

• D21H21/18

  Reinforcing agents · CPC title

• C09D103/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title