WO2001055507A1 - Base paper, method to produce it and release paper - Google Patents

Base paper, method to produce it and release paper Download PDF

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Publication number
WO2001055507A1
WO2001055507A1 PCT/FI2001/000056 FI0100056W WO0155507A1 WO 2001055507 A1 WO2001055507 A1 WO 2001055507A1 FI 0100056 W FI0100056 W FI 0100056W WO 0155507 A1 WO0155507 A1 WO 0155507A1
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WO
WIPO (PCT)
Prior art keywords
base paper
pigment
mixture
paper
surface sizing
Prior art date
Application number
PCT/FI2001/000056
Other languages
French (fr)
Inventor
Kaj Koskinen
Petri Tani
Original Assignee
Upm-Kymmene Corporation
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
Application filed by Upm-Kymmene Corporation filed Critical Upm-Kymmene Corporation
Publication of WO2001055507A1 publication Critical patent/WO2001055507A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/001—Release paper
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/26—Presence of textile or fabric
    • C09J2400/263—Presence of textile or fabric in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2429/00—Presence of polyvinyl alcohol
    • C09J2429/005—Presence of polyvinyl alcohol in the release coating
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed

Definitions

  • the invention relates to a base paper for a release paper, the base paper comprising a body layer which is formed of a fibre raw material and whose surface which receives a release agent is provided with a surface sizing containing binder and pigment.
  • the invention also relates to a release paper whose base paper is of the above-mentioned type, as well as a method for the manufacture of such a base paper.
  • Release papers are used as backing papers for various adhesive labels, wherein they are provided, on the surface which will be positioned against the adhesive layer of the label, with a release agent which can be easily detached from the adhesive and is usually a layer formed of a material based on silicone polymers.
  • the functional demands on the base paper for the release paper are complex, due to the wide range of use and the difficult applications.
  • the essential properties of the base paper include: strength properties (also after thermal treatment), dimensional stability, high density, barrier properties, chemical suitability for siliconization, high transparency, low porosity, and good smoothness.
  • strength properties also after thermal treatment
  • dimensional stability high density
  • barrier properties chemical suitability for siliconization
  • high transparency low porosity
  • good smoothness good smoothness.
  • a well-functioning base paper is passed without breaks on a converting machine, requires little silicone for good silicone coverage, functions without problems in die cutting of a laminate, and does not cause problems in labelling.
  • US patent 4,859,511 presents a layer of an intrinsically hydrophobic polymer between the base paper and the release agent. It is also known to coat the base paper before applying the release agent with a mixture of a latex binder and a pigment, as disclosed in US patent 4,609,589 (example #47), to which corresponds EP application publication 150 772, in international application publication WO 96/31651 , and in Japanese application publication JP-6-264038.
  • the surface size contains 100 weight parts of pigment, 10 to 30 weight parts of styrene butadiene latex as a hydro- phobic binder, and 0.5 to 5 weight parts of oxidation modified starch and/or starch phosphate as a hydrophilic binder.
  • the quantity of application of the surface adhesive is typically about 3 g per square metre.
  • the mixture of polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) is a commonly used surface size for papers. This has also been used in the surface sizing formula for the base paper which receives a release agent. Provision of a closed surface, with either a well-sealing thin surface sizing layer or a large quantity of the surface size, will result in a release paper with good properties. However, it has been found that the PVA CMC mixture is not capable of filling pores of variable sizes on the surface of the paper.
  • the aim of the invention is to provide a new base paper which can, thanks to its surface sizing, be better siliconized, in the sense of reducing the quantity of silicone required for good silicone coverage.
  • the improved properties of the base paper to achieve this are low porosity and hydrophobicity of the paper.
  • the invention is primarily characterized in that the pigment-containing binder for the surface sizing contains at least polyvinyl alcohol (PVA) and latex dispersion in a mixture.
  • PVA polyvinyl alcohol
  • the adhesive also contains carboxymethyl cellulose (CMC), preferably 10 to 50 wt-%, more advantageously 15 to 25 wt-%, of the total quantity of PVA and CMC. Furthermore, with combinations based on the above adhesives, good results are achieved by applying relatively small quantities.
  • the quantity of the surface sizing, as dry substance is 2 g/m 2 at the most, advantageously 0.7 to 2.0 g/m 2 , preferably 0.7 to 1.5 g/m 2 , which increases the cost-effectiveness of the manufacture of the base paper, and the transparency remains good as well.
  • Fig. 1 shows, in a schematic cross-section, one possible adhesive label product, in which the release paper can be used, and
  • Fig. 2 shows the release paper in a schematic cross-section.
  • the adhesive label product consists of a base paper P having an adhesive layer 4, and a release paper R having a release agent layer 3 which is against the adhesive layer 4.
  • text and/or patterns can be printed by various printing methods.
  • Figure 2 shows the base paper 1 for the release paper R intended for the adhesive label product of Fig. 1.
  • the base paper 1 has a body layer 1a which is formed of a suitable fibre raw material, such as cellulose-based paper pulp.
  • a surface sizing 1 b is provided on the body layer 1a, at least on the side which will be provided with a layer of the release agent.
  • the surface paper of the label product and the base paper of the release paper are introduced as rolls with a fixed width and length to the production line.
  • the base paper is first coated in a roll coating unit with a silicone layer which is polymerized and cured at 140°C in an oven.
  • the quantity of silicone applied is about 1 g/m 2 .
  • a release paper is obtained whose surface is provided with a layer of the release agent.
  • the release paper is coated with an adhesive layer on its siliconized side.
  • the adhesive is normally an aqueous dispersion, from which extra water is evaporated in a dryer. After the drying, the web is passed through a wetting unit to achieve a suitable moisture level.
  • the back paper and the surface paper are laminated together by running them between rolls which press the layers together.
  • the ready laminate is collected on a roll.
  • the laminate can be reprocessed in a variety of ways, for example, printed with a printing machine. It is also possible to punch out labels of suitable size from the laminate after the printing.
  • the release paper provided with a release agent layer can also be introduced as a ready product to the production line and be combined there with the surface paper of the label product.
  • a known PVA/CMC surface size, a known barrier coating used for paper and board based packaging materials, and mixtures of these were used in surface sizing tests.
  • known surface size and coating compositions were tested separately, and in the second series, tests were made on mixtures of these compositions.
  • the known surface size (below: surface size) was a mixture of polyvinyl alcohol and carboxymethyl cellulose (PVA/CMC) dissolved in water, wherein the ratio between PVA and CMC was 80:20, based on weight parts.
  • PVA/CMC polyvinyl alcohol and carboxymethyl cellulose
  • the known barrier coating (below: barrier) was an aqueous pigment paste which is intended for paper and board packaging materials and provides barrier properties, and in which the main components are 2 weight parts of talc and 1 weight part of styrene-butadiene latex dispersion, based on the dry substance.
  • the additives and adjuvants were the same as those used in coating mixes for paper industry.
  • the surface sizings were made on a paper with a film size press, after which the sizing was dried and the paper was calendered.
  • the known barrier coating used in the reference tests had poorer results e.g. in Bekk porosity, in IGT stain length which correlates with the surface smoothness, and in Unger oil absorption, compared with the known surface size, at those coating quantities (less than 3 g/m 2 ) which can be used without losing the transparency.
  • Unger oil absorption means that too much silicone is absorbed in the paper.
  • Shirlastain test which is commonly used for testing the hydrophobicity of the surface of siliconized papers, based on the absorption of an aqueous test solution, a clear improvement was achieved with the known barrier coating, compared with the known surface size.
  • the results were better than with the known surface size when the ratios between the surface size and the barrier ranged between 40:60 and 60:40.
  • the content of pigment in the total surface sizing is about 20 to 45 wt-%, and the amount of latex in relation to the rest of the binder is 20 to 55 parts per 100 parts.
  • the components of the composition have a combined effect to achieve an optimal result in such a way that the PVA/CMC adhesive acts as a film former, the fine-grained pigment (average particle size preferably less than 2 ⁇ m expressed in equivalent diameter, e.s.d.) fills in the pores, and the styrene-butadiene latex binder increases the water repellence.
  • the fine-grained pigment average particle size preferably less than 2 ⁇ m expressed in equivalent diameter, e.s.d.
  • the pigment it is possible to use, instead of talc, also other fine mineral fillers or mixtures of mineral fillers.
  • the mineral filler is preferably intrinsically hydrophobic, which is typical of talc (e.g. US 5,229,094).
  • latex binder it is also possible to use other homo- and copolymer latex dispersions.
  • examples include acrylate, styrene-acrylate and polyvinyl acetate latexes.
  • the adhesive component can contain other binders, at a maximum of 10 wt-% of the total quantity of the binder.
  • the surface of the paper can be made tighter and more water-resistant by using only small quantities of the coating according to the invention, for example at a maximum of 2 g/m 2 . Only coating quantities of about 1 g/m 2 are sufficient to achieve sufficient surface properties of the base paper.
  • the surface sizing mixture can be applied as an aqueous composition in which the latex binder, the polyvinyl alcohol, possibly carboxymethyl cellulose, and the pigment are well mixed with each other, onto the body layer by suitable coating methods.
  • the body layer is preferably an uncoated paper made of chemical pulp, for example a mixture of softwood pulp and hardwood pulp.
  • the body layer can also be sized on the other side, to prevent curling.
  • the basis weight of the obtained base paper is usually from 50 to 90 g/m 2

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Paper (AREA)

Abstract

A base paper for a release paper comprises a body layer (1a) which is formed of a fibre raw material and whose surface is provided with a surface sizing (1b) containing binder and pigment, forming a surface to receive a release agent. The pigment-containing binder of the surface sizing (1b) contains at least polyvinyl alcohol (PVA) and a latex dispersion in a mixture.

Description

Base paper, method to produce it and release paper
The invention relates to a base paper for a release paper, the base paper comprising a body layer which is formed of a fibre raw material and whose surface which receives a release agent is provided with a surface sizing containing binder and pigment. The invention also relates to a release paper whose base paper is of the above-mentioned type, as well as a method for the manufacture of such a base paper.
Release papers are used as backing papers for various adhesive labels, wherein they are provided, on the surface which will be positioned against the adhesive layer of the label, with a release agent which can be easily detached from the adhesive and is usually a layer formed of a material based on silicone polymers.
Most of the base papers presently on the market are used for silicone coating with a solvent-free silicone system. As this method has become more common, the surface properties of the base paper of the release paper have become more significant in achieving a good siliconized surface quality. Due to the properties of silicone, the low porosity, low water and oil absorptivity, and high smoothness of the base paper have become more important.
The functional demands on the base paper for the release paper are complex, due to the wide range of use and the difficult applications. The essential properties of the base paper include: strength properties (also after thermal treatment), dimensional stability, high density, barrier properties, chemical suitability for siliconization, high transparency, low porosity, and good smoothness. A well-functioning base paper is passed without breaks on a converting machine, requires little silicone for good silicone coverage, functions without problems in die cutting of a laminate, and does not cause problems in labelling.
To improve the quality of the base paper, it is known to provide at least its surface which receives the release agent, with a suitable substance.
Consequently, US patent 4,859,511 presents a layer of an intrinsically hydrophobic polymer between the base paper and the release agent. It is also known to coat the base paper before applying the release agent with a mixture of a latex binder and a pigment, as disclosed in US patent 4,609,589 (example #47), to which corresponds EP application publication 150 772, in international application publication WO 96/31651 , and in Japanese application publication JP-6-264038. In the last mentioned publication, the surface size contains 100 weight parts of pigment, 10 to 30 weight parts of styrene butadiene latex as a hydro- phobic binder, and 0.5 to 5 weight parts of oxidation modified starch and/or starch phosphate as a hydrophilic binder. In prior art, the quantity of application of the surface adhesive is typically about 3 g per square metre.
The mixture of polyvinyl alcohol (PVA) and carboxymethyl cellulose (CMC) is a commonly used surface size for papers. This has also been used in the surface sizing formula for the base paper which receives a release agent. Provision of a closed surface, with either a well-sealing thin surface sizing layer or a large quantity of the surface size, will result in a release paper with good properties. However, it has been found that the PVA CMC mixture is not capable of filling pores of variable sizes on the surface of the paper.
The aim of the invention is to provide a new base paper which can, thanks to its surface sizing, be better siliconized, in the sense of reducing the quantity of silicone required for good silicone coverage. The improved properties of the base paper to achieve this are low porosity and hydrophobicity of the paper.
To achieve this aim, the invention is primarily characterized in that the pigment-containing binder for the surface sizing contains at least polyvinyl alcohol (PVA) and latex dispersion in a mixture. A mixture based on this, with suitable mutual ratios, has resulted in better values in many properties which are important in view of siliconization.
According to an advantageous embodiment, the adhesive also contains carboxymethyl cellulose (CMC), preferably 10 to 50 wt-%, more advantageously 15 to 25 wt-%, of the total quantity of PVA and CMC. Furthermore, with combinations based on the above adhesives, good results are achieved by applying relatively small quantities. According to an advantageous embodiment, the quantity of the surface sizing, as dry substance, is 2 g/m2 at the most, advantageously 0.7 to 2.0 g/m2, preferably 0.7 to 1.5 g/m2, which increases the cost-effectiveness of the manufacture of the base paper, and the transparency remains good as well.
In the following, the invention will be described with reference to the appended drawing, in which
Fig. 1 shows, in a schematic cross-section, one possible adhesive label product, in which the release paper can be used, and
Fig. 2 shows the release paper in a schematic cross-section.
The figures are presented to illustrate the field of use of the invention, and the relative sizes of their parts are not intended to show the real situation.
According to Fig. 1 , the adhesive label product consists of a base paper P having an adhesive layer 4, and a release paper R having a release agent layer 3 which is against the adhesive layer 4. On the other side of the surface paper 2, text and/or patterns can be printed by various printing methods.
Figure 2 shows the base paper 1 for the release paper R intended for the adhesive label product of Fig. 1. The base paper 1 has a body layer 1a which is formed of a suitable fibre raw material, such as cellulose-based paper pulp. A surface sizing 1 b is provided on the body layer 1a, at least on the side which will be provided with a layer of the release agent.
The following is a description of the method for the manufacture of the label product, as an example which does not restrict the invention.
In the manufacture of the adhesive label product, the surface paper of the label product and the base paper of the release paper are introduced as rolls with a fixed width and length to the production line. The base paper is first coated in a roll coating unit with a silicone layer which is polymerized and cured at 140°C in an oven. The quantity of silicone applied is about 1 g/m2. In this way, a release paper is obtained whose surface is provided with a layer of the release agent. Next, the release paper is coated with an adhesive layer on its siliconized side. The adhesive is normally an aqueous dispersion, from which extra water is evaporated in a dryer. After the drying, the web is passed through a wetting unit to achieve a suitable moisture level. The back paper and the surface paper are laminated together by running them between rolls which press the layers together. The ready laminate is collected on a roll. The laminate can be reprocessed in a variety of ways, for example, printed with a printing machine. It is also possible to punch out labels of suitable size from the laminate after the printing. The release paper provided with a release agent layer can also be introduced as a ready product to the production line and be combined there with the surface paper of the label product.
The following is a description of tests made on the invention, which do not restrict the scope of protection of the invention.
A known PVA/CMC surface size, a known barrier coating used for paper and board based packaging materials, and mixtures of these were used in surface sizing tests. In the first test series, known surface size and coating compositions were tested separately, and in the second series, tests were made on mixtures of these compositions.
The known surface size (below: surface size) was a mixture of polyvinyl alcohol and carboxymethyl cellulose (PVA/CMC) dissolved in water, wherein the ratio between PVA and CMC was 80:20, based on weight parts.
The known barrier coating (below: barrier) was an aqueous pigment paste which is intended for paper and board packaging materials and provides barrier properties, and in which the main components are 2 weight parts of talc and 1 weight part of styrene-butadiene latex dispersion, based on the dry substance. The additives and adjuvants were the same as those used in coating mixes for paper industry. The surface sizings were made on a paper with a film size press, after which the sizing was dried and the paper was calendered.
First tests
In the first test series, the known barrier coating used in the reference tests had poorer results e.g. in Bekk porosity, in IGT stain length which correlates with the surface smoothness, and in Unger oil absorption, compared with the known surface size, at those coating quantities (less than 3 g/m2) which can be used without losing the transparency. The poor result of Unger oil absorption means that too much silicone is absorbed in the paper. On the other hand, in the Shirlastain test which is commonly used for testing the hydrophobicity of the surface of siliconized papers, based on the absorption of an aqueous test solution, a clear improvement was achieved with the known barrier coating, compared with the known surface size.
Second tests
Better results were achieved with a surface sizing composition in which the known surface size and the known barrier coating were mixed with each other in a ratio of equal quantities, calculated from the dry substance (below: "mixture").
Bekk porosity values (s/100 ml) with coating quantities of 1.5 g/m2: Surface size: about 190
Barrier: about 20
Mixture: about 900
Bekk porosity values (s/100 ml) with coating quantities of 0.7 g/m2: Surface size: about 210
Barrier: about 20
Mixture: about 280 Unger oil absorption values (g/m2) with coating quantities of 1.5 g/m2: Surface size: about 0.85
Barrier: about 2.5
Mixture: about 0.65
Absorption of silicone (g/m2, silicone test similar to the Unger test), coating quantities of 1.5 g/m2: Surface size: about 0.9
Mixture: about 0.7
coating quantities of 0.7 g/m2: Surface size: about 1.0
Mixture: about 0.8
Shirlastain test (absorption of solution, g/m2) with coating quantities of 1.5 g/m2:
Surface size: about 16
Barrier: about 12
Mixture: about 14
Shirlastain test (absorption of solution, g/m2) with coating quantities of 0.7 g/m2:
Surface size: about 18
Barrier: about 14 Mixture: about 15
IGT stain length (cm) with coating quantities of 1.5 g/m2: Surface size: about 13.7
Mixture: about 14.1
With the mixture of 50:50, a clear improvement was achieved in the oil absorption and a considerable improvement in the Bekk porosity, compared with both references. Similarly, the results in the absorption of the Shirlastain test fluid were better than with the known surface size.
Furthermore, the results were better than with the known surface size when the ratios between the surface size and the barrier ranged between 40:60 and 60:40. Considering the compositions of the above substances and the fact that good results, in at least some properties, can be achieved even beyond the above-mentioned limit values, the content of pigment in the total surface sizing is about 20 to 45 wt-%, and the amount of latex in relation to the rest of the binder is 20 to 55 parts per 100 parts.
It can be assumed that the components of the composition have a combined effect to achieve an optimal result in such a way that the PVA/CMC adhesive acts as a film former, the fine-grained pigment (average particle size preferably less than 2 μm expressed in equivalent diameter, e.s.d.) fills in the pores, and the styrene-butadiene latex binder increases the water repellence.
As the pigment, it is possible to use, instead of talc, also other fine mineral fillers or mixtures of mineral fillers. The mineral filler is preferably intrinsically hydrophobic, which is typical of talc (e.g. US 5,229,094).
As the latex binder, it is also possible to use other homo- and copolymer latex dispersions. Examples include acrylate, styrene-acrylate and polyvinyl acetate latexes.
In addition to the latex dispersion and the PVA or the PVA CMC mixture, the adhesive component can contain other binders, at a maximum of 10 wt-% of the total quantity of the binder.
The surface of the paper can be made tighter and more water-resistant by using only small quantities of the coating according to the invention, for example at a maximum of 2 g/m2. Only coating quantities of about 1 g/m2 are sufficient to achieve sufficient surface properties of the base paper.
The surface sizing mixture can be applied as an aqueous composition in which the latex binder, the polyvinyl alcohol, possibly carboxymethyl cellulose, and the pigment are well mixed with each other, onto the body layer by suitable coating methods. The body layer is preferably an uncoated paper made of chemical pulp, for example a mixture of softwood pulp and hardwood pulp. In connection with the surface sizing, the body layer can also be sized on the other side, to prevent curling. o
The basis weight of the obtained base paper is usually from 50 to 90 g/m2

Claims

Claims:
1. A base paper for a release paper, comprising a body layer (1a) which is formed of a fibre raw material and whose surface is provided with a surface sizing (1 b) containing a binder and pigment and forming a surface to receive a release agent, characterized in that the pigment-containing binder of the surface sizing contains at least polyvinyl alcohol (PVA) and a latex dispersion in a mixture.
2. The base paper according to claim 1 , characterized in that the binder also contains carboxymethyl cellulose (CMC).
3. The base paper according to claim 2, characterized in that the ratio between the polyvinyl alcohol and the CMC, based on weight parts, is between 50:50 and 90:10, preferably between 75:25 and 85:15.
4. The base paper according to any of the preceding claims, characterized in that the pigment is talc.
5. The base paper according to any of the preceding claims, characterized in that the amount of pigment is 10 to 50 wt-%, preferably 25 to 40 wt-% of the dry matter of the surface sizing (1 b).
6. The base paper according to claim 5, characterized in that the amount of pigment is 30 to 37 wt-%.
7. The base paper according to any of the preceding claims, characterized in that the ratio between the latex dispersion and the polyvinyl alcohol or, if the adhesive contains CMC, the mixture of PVA and CMC, is between 20:100 and 55:100.
8. The base paper according to claim 7, characterized in that the ratio is between 30:100 and 40:100.
9. The base paper according to any of the preceding claims, characterized in that the quantity of the surface sizing (1 b) is less than 2 g/m2, preferably from 0.7 to 1.5 g/m2.
10. The base paper according to any of the preceding claims, characterized in that the body layer (1a) is of chemical pulp, for example a mixture of softwood pulp and hardwood pulp.
11. The base paper according to any of the preceding claims, characterized in that its basis weight is 50 to 90 g/m2.
12. A method for manufacturing a base paper for a release paper (R), in which a body layer (1a) which is formed of a fibre raw material is provided with a surface sizing containing binder and pigment, characterized in that the binder of the surface size contains at least polyvinyl alcohol (PVA) and a latex dispersion in a mixture.
13. The method according to claim 12, characterized in that the surface sizing is made by mixing an aqueous mixture of a latex dispersion and pigment, and an aqueous solution of polyvinyl alcohol which possibly also contains carboxymethyl cellulose, with each other.
14. The method according to claim 12 or 13, characterized in that the surface sizing is applied onto the body layer (1a) in an amount of 2 g/m2 at the most, preferably 7 to 1.5 g/m2.
15. A release paper which is equipped, on its surface which comes against the adhesive layer of an adhesive label product, with a release agent layer (3) applied onto a base paper (1 ), characterized in that the release agent layer (3) is applied onto a surface sizing (1b) according to any of the preceding claims 1 to 11.
PCT/FI2001/000056 2000-01-26 2001-01-23 Base paper, method to produce it and release paper WO2001055507A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20000151A FI116087B (en) 2000-01-26 2000-01-26 Base paper, process for its preparation and release paper
FI20000151 2000-01-26

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1231322A3 (en) * 2001-02-13 2003-07-30 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Self-cleaning anti-adhesive papers and paper materials, and process for making the same
WO2004111336A1 (en) * 2003-06-17 2004-12-23 Upm-Kymmene Corporation Surface sized paper
WO2005001201A1 (en) * 2003-06-30 2005-01-06 M-Real Oyj Coated base paper and a method for manufacturing coated base paper
WO2009147283A1 (en) * 2008-06-03 2009-12-10 Upm-Kymmene Corporation A release liner composition, a base material and a method of producing a base material, and a surface treating agent for a base material and a use of a surface treating agent
DE102018118271A1 (en) * 2018-07-27 2020-01-30 Delfortgroup Ag LIGHT RELEASE BASE PAPER
CN113652894A (en) * 2021-07-15 2021-11-16 桂林奇峰纸业有限公司 Cake holds in palm antiseized processing apparatus of paper

Citations (6)

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EP1231322A3 (en) * 2001-02-13 2003-07-30 Papierfabrik Schoeller & Hoesch Gmbh & Co. Kg Self-cleaning anti-adhesive papers and paper materials, and process for making the same
WO2004111336A1 (en) * 2003-06-17 2004-12-23 Upm-Kymmene Corporation Surface sized paper
WO2005001201A1 (en) * 2003-06-30 2005-01-06 M-Real Oyj Coated base paper and a method for manufacturing coated base paper
WO2009147283A1 (en) * 2008-06-03 2009-12-10 Upm-Kymmene Corporation A release liner composition, a base material and a method of producing a base material, and a surface treating agent for a base material and a use of a surface treating agent
EP2574643A1 (en) * 2008-06-03 2013-04-03 UPM-Kymmene Corporation A release liner composition, a base material and a method of producing a base material, and a surface treating agent for a base material and a use of a surface treating agent
EP2574644A1 (en) * 2008-06-03 2013-04-03 UPM-Kymmene Corporation A release liner composition, a base material and a method of producing a base material, and a surface treating agent for a base material and a use of a surface treating agent
EP3009483A1 (en) * 2008-06-03 2016-04-20 UPM-Kymmene Corporation A release liner, a base material and a method of producing a base material and a use of a surface treating agent
DE102018118271A1 (en) * 2018-07-27 2020-01-30 Delfortgroup Ag LIGHT RELEASE BASE PAPER
CN113652894A (en) * 2021-07-15 2021-11-16 桂林奇峰纸业有限公司 Cake holds in palm antiseized processing apparatus of paper

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