WO2006111184A1 - Water dispersible composition for treating paper - Google Patents

Water dispersible composition for treating paper

Info

Publication number
WO2006111184A1
WO2006111184A1 PCT/EP2005/004283 EP2005004283W WO2006111184A1 WO 2006111184 A1 WO2006111184 A1 WO 2006111184A1 EP 2005004283 W EP2005004283 W EP 2005004283W WO 2006111184 A1 WO2006111184 A1 WO 2006111184A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
paper
composition
invention
wt
emulsion
Prior art date
Application number
PCT/EP2005/004283
Other languages
French (fr)
Inventor
Eric JÖNSON
Original Assignee
Topchim N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUSE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS
    • C08K7/00Use of ingredients characterised by shape
    • C08K7/22Expanded, porous or hollow particles
    • C08K7/24Expanded, porous or hollow particles inorganic
    • C08K7/28Glass
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H19/00Coated paper; Coating material
    • D21H19/36Coatings with pigments
    • D21H19/44Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52Additives of definite length or shape
    • D21H21/54Additives of definite length or shape being spherical, e.g. microcapsules, beads

Abstract

A water-dispersible composition consisting of the components (A) to (B), in the following weight (wt) percentages comprising one or more compounds selected from the group consisting of: (A) 20 to 90 wt % of styrene butadiene latex (SBR), styrene acrylate latex and ethylene acrylate latex, (B) 10 to 80 wt % of spherical solid / hollow micro glass beads.

Description

WATER DISPERSIBLE COMPOSITION FOR TREATING PAPER

Field of the invention

The present invention relates to a water-dispersible composition, which when applied to paper, or cardboard gives a low permeability for grease, gas, moisture and has no tacky, sticky or abrasive behaviour with a high solid content and a low viscosity and no dilatant behaviour (in high shear area) made using the foregoing composition.

Background of the invention

Recently, form the standpoint of saving resources, a demand of collecting used paper and regenerating papers again after dissolving the papers in water has been increased.

It is required for the papers meeting the demand to have a so-called easily macerating property, that is, when the paper is dissolved in water the paper is easily macerated into fine fibrous forms. A composition for making an easily macerating moisture proof paper is known from WO- A.2004/022647.

The composition is based upon a mixture of polyvinyl butyral, styrene maleic imide and ethylene acrylate and possibly other components. As such satisfactory results have been obtained, but the use of polyvinyl butyral offers a number of disadvantages. As such this product is difficult to produce and always contains residue of solvent, which can lead to unwanted effects in the paper to be coated with the final composition. Furthermore polyvinyl butyral is difficult to bring into a suspension and depending upon the pH-value the emulsion may be unstable. Normally the pH should be at least 9. When lower pH-values are to be used polyvinyl butyral must be dispersed and therefore a solvent must be used.

Also a composition like this gives a high Tack (sticky behaviour) when coated (or treated by size or film press) on the paper. These compositions have also a low solid content with a high viscosity. Summary of the invention

The object of the present invention is to provide a composition, for making a water repellent paper with a low permeability for grease and moisture vapour, consisting of the components (A) to (B), in the following weight (wt) percentages comprising one or more compounds selected from the group consisting of :

• (A) 20-90 wt % styrene butadiene latex (SBR), styrene acrylate latex and ethylene acrylate latex • (B) 10-80 wt % spherical solid / hollow micro glass beads.

Detailed description of the invention

The present invention is described in detail below. The aqueous emulsion of the present invention contains the components (A), and (B) described above as the essential components.

Component (A) is 20 to 90 % by weight of SBR. If the content of the SBR in the composition of the present invention is below 20 wt %; the paper obtained with such emulsion has poor grease repulsive properties and a too high moisture permeability. A composition with more than 90 wt % of SBR has a too high tack (sticky behaviour).

A preferred composition comprises 20 to 90 wt % SBR. Paper treated with a composition according to the invention comprising less than 32 wt % of SBR can be macerated with a home mixer using a low mixing speed while a paper casted from a thus obtained pulp exhibits no sticky and agglomerated particles. Paper treated with a composition comprising at least 28 wt % of the SBR turned out to have an excellent resistance against penetration of solvents.

SBR generally is used as an emulsion in water. A suitable concentration of the SBR emulsion is about 50 wt %. A concentration above 50 wt % is hard to process due to its fast drying character. The emulsion comprises SBR particles with a preferred average particle size of between 5 and 1000 nm. In order to stabilize the SBR emulsion, the emulsion further comprise an emulsifier.

Component (B) is 10 to 80 % by weight of spherical solid/hollow micro glass beads, spherical solid/hollow micro glass beads can be coated and uncoated (the coating act as a coupling agent between the spherical solid/hollow micro glass beads and the binder, and changing the surface activity of the composition). Preferable their diameter is between 5 nanometers and 50 micrometers.

The aqueous emulsion of the present invention can be produced by, for example, the following method. The SBR emulsion as the component (A) is placed in a vessel equipped with a stirrer and stirred to an extent of not forming bubbles. Component (B) is added and followed by stirring for mixing. The aqueous emulsion of the present invention can be thus obtained.

The invention further relates to an easily macerating grease-proof paper comprising a base paper being coated (or treated) on at least one surface thereof a layer of an aqueous emulsion comprising a water-dispersible composition according to the invention, wherein the solid content in the aqueous emulsion is from 10 to 85 % by weight. Preferably the solid content is from 25 to 75 % by weight. Within the range from 40 to 75 wt % the viscosity of the composition according to the invention is suitable for processing on a coating machine. The viscosity of a composition with 45 to 65 wt % of solid content allows processing on high speed paper coating machines. The easily macerating grease-proof paper/carboard of the present invention is obtained by coating (or other form of treatment) the aqueous emulsion on at least one surface of a base paper in an amount of from 1 to 75 g/m2. If the amount of the aqueous emulsion used is below 1 g/m2, the paper obtained has poor grease-proof property and water repellency by the formation of pinholes and the occurrence of fluffing of the fibers of the base paper, while if the amount of the aqueous emulsion is above 75 g/m2 no relevant improvement of the vapor transmission rate is obtained. A kraft paper, a wood free paper, a corrugated board base paper, etc., can be used as the base paper, but the base paper used in the present invention is not limited to those.

For obtaining the easily macerating grease-proof paper of the present invention, for example, the definite amount of the aqueous emulsion is coated (or other treatment) on a base paper with e.g. a blade, a rollercoater or an air-knife coater, and dried at a temperature of higher than about 125 °C. and up to 200 0C. In addition, when the drying temperature is too low, it sometimes happens that the easily macerating moisture-proof paper obtained is inferior in the grease-proof property.

The easily macerating moisture-proof paper of the present invention is most suitably used in a wide field, for example, as a wrapping paper, a water-resistant corrugated fibreboard paper, food packaging paper or carboard, petfood packaging paper or carboard, a wrapping paper for copying paper owing to the excellent characteristics.

An extra advantage of the present invention is that the composition according to the invention is free of halogens, has a high resistance against solvents and can be applied on-line on a paper production machine. A paper treated with the composition of the invention exhibits a high oxygen barrier, which makes it very suitable for the packaging of food.

Experimental

The present invention is explained in more detail by the examples I - Vl

I. Aqueous compositions were obtained with amount of the components (A) to (B) as shown in Table 1. For each of the compositions coated paper was made under the following coating condition : each coated paper was obtained by coating each aqueous emulsion on a kraft paper having a basis weight as given in table 1 with a roller coater at a coating amount as shown in table 1.

II. The coated paper was dried at 140 0C and items of the vapor transmission rate, the water repellency, the coefficient of friction, gloss and the grease resistance were evaluated as follows.

III. The tack was measured by measuring the gloss of the paper (less gloss means less tack )

IV. The water repellency was measured according to the Cobb method during 3 respectively 10 minutes with a kraft paper treated with 17 -18 g/m2 of a composition according to table 1.

V. The grease resistance is measured according to the Kitt test according to

3M.

Vl. The coefficient of friction (C. O. F.) was measured with a Incleanometer. The ratings were given as the angle between the slope and the horizontal plane. The results obtained are shown in table 2. The higher the angle the higher the C. O. F..

TABLE 1

TABLE 2

The measurement of the gloss was done by coating the paper with the different compositions and to coil the paper. During coiling the coated surface of the paper is contacting the rear surface of the paper/cardboard. If the two contacting surfaces are sticking to each other one or both of the surfaces may be damaged after decoiling. Measuring the gloss therefore can represents an indication of the sticking properties of the coated paper/cardboard. Based upon this measurement it has been found that the addition of spherical solid/hollow micro glass beads particles reducing the sticking tendency of the coated paper, as becomes evident from the values in the column C. O. F.

Claims

1. A water-dispersible composition consisting of the components (A) to (B), in the following weight (wt) percentages comprising one or more compounds selected from the group consisting of :
• (A) 20 to 90 wt % of styrene butadiene latex (SBR), styrene acrylate latex and ethylene acrylate latex
• (B) 10 to 80 wt % of spherical solid / hollow micro glass beads
2. Composition according to claim 1 , wherein the amount of component (A) is at least 20 wt%.
3. Composition according to claim 1 and 2 wherein the amount of component (A) is at most 90 wt %.
4. Composition according to any one of the preceding claims wherein the average particle size of SBR is between 5 and 1000 nm.
5. composition according to any of the preceding claims, wherein the component (B) is at least 10 wt %.
6. Composition according to any one of the preceding claims, wherein the component (B) is at most 80 wt %.
7. Composition according to any one of the preceding claims, wherein spherical solid/hollow micro glass beads are coated or not coated.
8. Composition according to any one of the preceding claims, wherein the spherical solid/hollow micro glass beads have a diameter between 5 nanometers and 50 micrometers. 10. Aqueous emulsion according to claim 10, wherein the solid content is between 25 and 75 % by weight, preferably between 41 and 75 % by weight.
11.An easily macerating grease-proof material comprising a base cellulose material having coated (or treated) on at least one surface thereof a layer of the composition according to any of claims 1 to 6, in an amount of from 1 to 75 g/m2.
PCT/EP2005/004283 2005-04-21 2005-04-21 Water dispersible composition for treating paper WO2006111184A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/004283 WO2006111184A1 (en) 2005-04-21 2005-04-21 Water dispersible composition for treating paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2005/004283 WO2006111184A1 (en) 2005-04-21 2005-04-21 Water dispersible composition for treating paper

Publications (1)

Publication Number Publication Date
WO2006111184A1 true true WO2006111184A1 (en) 2006-10-26

Family

ID=35426959

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/004283 WO2006111184A1 (en) 2005-04-21 2005-04-21 Water dispersible composition for treating paper

Country Status (1)

Country Link
WO (1) WO2006111184A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102225982A (en) * 2011-05-06 2011-10-26 华南理工大学 Miniemulsion polymerization method of high-solid-content self-crosslinking type styrene-acrylate emulsion surface sizing agent

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360120A (en) * 1980-09-25 1982-11-23 W. R. Grace & Co. Sealing compositions
US4368828A (en) * 1980-09-25 1983-01-18 W. R. Grace & Co. Sealing compositions
JPS5964682A (en) * 1982-10-04 1984-04-12 Sumitomo Naugatuck Co Ltd Adhesive composition
GB2214186A (en) * 1988-01-05 1989-08-31 Wiggins Teape Group Ltd Release coatings
JPH10204794A (en) * 1997-01-14 1998-08-04 Oji Paper Co Ltd Moistureproof paper
US20030152724A1 (en) * 1997-02-26 2003-08-14 Fort James Corporation Coated paperboards and paperboard containers having improved tactile and bulk insulation properties

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4360120A (en) * 1980-09-25 1982-11-23 W. R. Grace & Co. Sealing compositions
US4368828A (en) * 1980-09-25 1983-01-18 W. R. Grace & Co. Sealing compositions
JPS5964682A (en) * 1982-10-04 1984-04-12 Sumitomo Naugatuck Co Ltd Adhesive composition
GB2214186A (en) * 1988-01-05 1989-08-31 Wiggins Teape Group Ltd Release coatings
JPH10204794A (en) * 1997-01-14 1998-08-04 Oji Paper Co Ltd Moistureproof paper
US20030152724A1 (en) * 1997-02-26 2003-08-14 Fort James Corporation Coated paperboards and paperboard containers having improved tactile and bulk insulation properties

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 198421, Derwent World Patents Index; Class A18, AN 1984-130206, XP002357360 *
DATABASE WPI Section Ch Week 199841, Derwent World Patents Index; Class A82, AN 1998-477332, XP002357359 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102225982A (en) * 2011-05-06 2011-10-26 华南理工大学 Miniemulsion polymerization method of high-solid-content self-crosslinking type styrene-acrylate emulsion surface sizing agent
CN102225982B (en) 2011-05-06 2013-08-28 华南理工大学 Miniemulsion polymerization method of high-solid-content self-crosslinking type styrene-acrylate emulsion surface sizing agent

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