WO2000003089A1 - Release liner paper - Google Patents

Release liner paper Download PDF

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Publication number
WO2000003089A1
WO2000003089A1 PCT/FI1999/000578 FI9900578W WO0003089A1 WO 2000003089 A1 WO2000003089 A1 WO 2000003089A1 FI 9900578 W FI9900578 W FI 9900578W WO 0003089 A1 WO0003089 A1 WO 0003089A1
Authority
WO
WIPO (PCT)
Prior art keywords
release liner
liner paper
fluorochemical
paper according
binders
Prior art date
Application number
PCT/FI1999/000578
Other languages
French (fr)
Inventor
Lars ÅSMUS
Rune SKÅTAR
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 WO2000003089A1 publication Critical patent/WO2000003089A1/en

Links

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
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/11—Halides
    • 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
    • D21H19/10—Coatings without pigments

Definitions

  • the present invention relates to a paper that is designed to be used as a release liner for industrial and consumer applications.
  • Release liners have low surface energy and have been produced before by treating the base paper with various silicone compounds, because these lower the surface energy efficiently.
  • silicone residues may cause damages.
  • the purpose of the invention is a release liner paper that contains no silicone chemicals as a release agent.
  • the purpose is achieved by using a water-soluble or water-dispersible organic fluorochemical as a constituent in the paper, either on the base paper surface and/or mixed with the fibrous raw material of the base paper. Both treatments on the same paper are also possible.
  • the organic fluorochemical contains at least one fluoroaliphatic group.
  • the fluoroaliphatic group is of relatively short chain length compared with e.g. fluorinated polymer chains such as PTFE.
  • the paper can be a kraft paper or similar that after the treatment gives the paper release properties to be used in the applications mentioned below.
  • the treatment can be done either on-line on a paper machine or off-line on a coater or a finishing apparatus.
  • the base paper for the release liner paper has a typical fibre construction of 40 — 100 % of soft wood kraft (pine and spruce a mixture of these varying from 100 spruce to 100 % pine) and 0 — 60 % hard wood kraft typically birch or eucalyptus.
  • the bleaching of the base paper raw material can be performed by so called ECF or TCF method.
  • An un- bleached paper is also usable.
  • the refining of the paper raw material is performed either by HCR (high consistency refining) at 20 — 35 % dry solids or LCR (low consistency refining) at 3 — 10 % solids.
  • HCR high consistency refining
  • LCR low consistency refining
  • the paper is treated with the fluorochemical either at the stage of the pulp via wet wend addition or with a surface treatment on a paper that already has undergone formation in the pa- permaking machine.
  • the fluorochemical can be one of the commercially available products under the trade names Scotchban FC 807, Scotchban FC 845, Asahi Guard 530, Asahi Guard 550, Zonyl RP Paper Fluoridizer, Foraperie and Baysynthol FCP.
  • the fluorochemical comprises water-soluble or water-dispersible organic fluoroaliphatic group containing compounds.
  • the property "water soluble” or “water dispersible” means that the compound can be spread along with a water-based carrier either on the surface of a fibrous web or within a fibrous network and will be permanently fixed on or within the fibrous web.
  • the compound has at least one fluoroaliphatic chain linked to a functional group, especially to an acid group capable of forming an anion.
  • a typical compound has the general formula (I)
  • R f is a perfluoroalkyl group
  • X is a divalent linking group containing an alkylene alone or together with one or several heteroatoms
  • A is a group of acid functionality, such as a carboxylic or phosphoric acid group, O representing the -OH group of the acid.
  • (R, — X) can be linked directly to a carbon of the carboxylic acid skeleton.
  • (R ( — X) can be linked to the phosphorus through a phosphoric acid ester bond.
  • M + is a monofunctional cation, preferably ammonium or amine.
  • the perfluoroalkyl group R f contains typically 3 to 18 carbon atoms, preferably 4 to 12, being of the type C n F n+1 , where n is 3 to 18, preferably 4 to 12.
  • Preferred products can be described as salts, particularly ammonium or amine salts, of perfluoroalkyl phosphates, e.g. mono and bis (1 H,1H,2H,2H-perfluoroalkyl)phosphates, especially their diethanol- amine salts, or salts of bis(N-ethyl-2-perfluoroalkylsulphonamido-ethyl) phosphates, especially their ammonium salts.
  • Typical of these compounds is that they contain no organopolysiloxane groups, and thus are free from silicone.
  • the paper can be treated on- or off- machine.
  • Usual surface treatment methods for applying a substance on the surface can be employed, such as size-press, film-press or the like.
  • the surface treatment with the fluorochemical can also involve natural polymer or natural polymer derivative binders, such as starch binders, typically native, oxidized or cationic starches or similar starch esters or ethers, or carboxymethyl cellulose.
  • the surface treatment can also involve mixtures of synthetic binders such as styrene butadiene latex, polyvinyl alcohols, polyvinyl acetates, acrylic latexes or their mixtures.
  • the viscosities of the surface treatment compositions can range from 15 — 1500 mPas at 50°C, measured with a Brookfield viscosimeter at 100 rpm.
  • a typical addition rate of the fluorochemical can vary from 1 to 10 g/m 2 of dry solids, calculated on the area of the base paper.
  • the mixture ratio of the chemicals can vary: Natural binder 0 — 90 %, fluorochemical 10 — 100 %, synthetic binder 0—90 %.
  • the total rate of the surface treatment composition including the binders can range from 1 to 20 g/m 2 .
  • the fluorochemical is added in the pulp before the paper formation, its addition rate can be from 1 to 10 g/m 2 of dry solids per each 100 g/m 2 of the basis weight of the final product.
  • the final release liner can be specified to have the typical values as described below: Test method
  • MD machine direction
  • CD cross-machine direction
  • the final product can have a grammage of 50 — 200 g/m 2 , especially 80 — 150 g/m 2 .
  • Tensile index can be in md 60 — 140 and in cd 40 — 60, and tear index both md and cd 6 — 13.
  • Air resistance can be 30 — 2000. Test methods and units are the same as described above.
  • the surface coating containing the fluorochemical as a release agent can extend uniformly over the entire area of the base paper, or the release liner product can have discrete areas of this coating.
  • the surface energy of the final product is typically in the range of 6 — 10 dyn/cm.
  • the paper can be produced on a single or double wire paper machine.
  • fluorochemical a single compound or a mixture of compounds of formula I can be used, many commercial products being mixtures of those compounds.
  • the release liner paper of the invention can be used in various applications where it is intended to lie against a surface of a different kind and to be released from this surface without difficulties so that no residues will be left on the surface.
  • Typical end use areas of the release liner paper of the invention are abrasive papers for the automotive industry, adhesive label release liners and adhesive tape release liners, but the invention is not exclusively limited to these end uses.

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  • Paper (AREA)

Abstract

A release liner paper contains a water-soluble or water-dispersible organic fluorochemical comprising a compound that contains at least one fluoroaliphatic group. The paper contains the fluorochemical as wet end addition in the pulp and/or as a surface treatment. The compound is for example a salt of perfluoroalkyl phosphate.

Description

Release liner paper
The present invention relates to a paper that is designed to be used as a release liner for industrial and consumer applications. Release liners have low surface energy and have been produced before by treating the base paper with various silicone compounds, because these lower the surface energy efficiently. However, in certain fields such as in automotive industry, silicone residues may cause damages.
The purpose of the invention is a release liner paper that contains no silicone chemicals as a release agent. The purpose is achieved by using a water-soluble or water-dispersible organic fluorochemical as a constituent in the paper, either on the base paper surface and/or mixed with the fibrous raw material of the base paper. Both treatments on the same paper are also possible. The organic fluorochemical contains at least one fluoroaliphatic group. The fluoroaliphatic group is of relatively short chain length compared with e.g. fluorinated polymer chains such as PTFE.
The paper can be a kraft paper or similar that after the treatment gives the paper release properties to be used in the applications mentioned below. The treatment can be done either on-line on a paper machine or off-line on a coater or a finishing apparatus.
The base paper for the release liner paper has a typical fibre construction of 40 — 100 % of soft wood kraft (pine and spruce a mixture of these varying from 100 spruce to 100 % pine) and 0 — 60 % hard wood kraft typically birch or eucalyptus. The bleaching of the base paper raw material can be performed by so called ECF or TCF method. An un- bleached paper is also usable. The refining of the paper raw material is performed either by HCR (high consistency refining) at 20 — 35 % dry solids or LCR (low consistency refining) at 3 — 10 % solids. However, the invention is not restricted to the pulp raw materials specified above.
According to the invention, the paper is treated with the fluorochemical either at the stage of the pulp via wet wend addition or with a surface treatment on a paper that already has undergone formation in the pa- permaking machine. The fluorochemical can be one of the commercially available products under the trade names Scotchban FC 807, Scotchban FC 845, Asahi Guard 530, Asahi Guard 550, Zonyl RP Paper Fluoridizer, Foraperie and Baysynthol FCP.
The fluorochemical comprises water-soluble or water-dispersible organic fluoroaliphatic group containing compounds. The property "water soluble" or "water dispersible" means that the compound can be spread along with a water-based carrier either on the surface of a fibrous web or within a fibrous network and will be permanently fixed on or within the fibrous web.
The compound has at least one fluoroaliphatic chain linked to a functional group, especially to an acid group capable of forming an anion.
A typical compound has the general formula (I)
(R, - X)ΛA(0-M*)m (I)
where Rf is a perfluoroalkyl group, X is a divalent linking group containing an alkylene alone or together with one or several heteroatoms, and A is a group of acid functionality, such as a carboxylic or phosphoric acid group, O representing the -OH group of the acid. In case of the carboxylic acid, (R, — X) can be linked directly to a carbon of the carboxylic acid skeleton. In case of the phosphoric acid , (R( — X) can be linked to the phosphorus through a phosphoric acid ester bond. In the formula, m is most typically 1 or 2 and n is 1 or 2, in Ihe case of A representing a phosphate m + n = 3. M+ is a monofunctional cation, preferably ammonium or amine.
The perfluoroalkyl group Rf contains typically 3 to 18 carbon atoms, preferably 4 to 12, being of the type CnF n+1 , where n is 3 to 18, preferably 4 to 12.
Preferred products can be described as salts, particularly ammonium or amine salts, of perfluoroalkyl phosphates, e.g. mono and bis (1 H,1H,2H,2H-perfluoroalkyl)phosphates, especially their diethanol- amine salts, or salts of bis(N-ethyl-2-perfluoroalkylsulphonamido-ethyl) phosphates, especially their ammonium salts. Typical of these compounds is that they contain no organopolysiloxane groups, and thus are free from silicone.
In case of the surface treatment, the paper can be treated on- or off- machine. Usual surface treatment methods for applying a substance on the surface can be employed, such as size-press, film-press or the like.
The surface treatment with the fluorochemical can also involve natural polymer or natural polymer derivative binders, such as starch binders, typically native, oxidized or cationic starches or similar starch esters or ethers, or carboxymethyl cellulose. The surface treatment can also involve mixtures of synthetic binders such as styrene butadiene latex, polyvinyl alcohols, polyvinyl acetates, acrylic latexes or their mixtures.
The viscosities of the surface treatment compositions can range from 15 — 1500 mPas at 50°C, measured with a Brookfield viscosimeter at 100 rpm.
In a surface treatment, a typical addition rate of the fluorochemical can vary from 1 to 10 g/m2 of dry solids, calculated on the area of the base paper. The mixture ratio of the chemicals can vary: Natural binder 0 — 90 %, fluorochemical 10 — 100 %, synthetic binder 0—90 %. The total rate of the surface treatment composition including the binders can range from 1 to 20 g/m2.
If the fluorochemical is added in the pulp before the paper formation, its addition rate can be from 1 to 10 g/m2 of dry solids per each 100 g/m2 of the basis weight of the final product.
It is also possible to add the fluorochemical both in the pulp before the paper formation and thereafter as surface application onto the same paper using a suitable combination of the above addition rates.
The final release liner can be specified to have the typical values as described below: Test method
Grammage (g/m2) 83 ISO 536
Tensile index
MD (Nm/g) 113 ISO 1924
CD (Nm/g) 50 ISO 1924
Tensile strength
MD (kN/m) 9,3 ISO 1924
CD (kN/m) 4,2 ISO 1924
Air resistance (s) 530 ISO 3687
Tear Index
MD (mNm2/g) 7,8 ISO 1974
CD (mNm2/g) 9,0 ISO 1974
Tear resistance
MD (mN) 650 ISO 1974
CD (mN) 750 ISO 1974
Burst Strength (kPa) 450 ISO 2758
Kit value ts 10 3M method ws 14
Brigthness value (%) 85 ISO 2470
Remarks: MD = machine direction, CD = cross-machine direction.
The final product can have a grammage of 50 — 200 g/m2, especially 80 — 150 g/m2. Tensile index can be in md 60 — 140 and in cd 40 — 60, and tear index both md and cd 6 — 13. Air resistance can be 30 — 2000. Test methods and units are the same as described above.
The surface coating containing the fluorochemical as a release agent can extend uniformly over the entire area of the base paper, or the release liner product can have discrete areas of this coating.
The surface energy of the final product is typically in the range of 6 — 10 dyn/cm.
The paper can be produced on a single or double wire paper machine. As the fluorochemical, a single compound or a mixture of compounds of formula I can be used, many commercial products being mixtures of those compounds.
All figures above are given as percent by weight (wt-%).
The invention is not restricted to the specific examples above, but it can vary within the scope determined by the appended claims.
The release liner paper of the invention can be used in various applications where it is intended to lie against a surface of a different kind and to be released from this surface without difficulties so that no residues will be left on the surface.
Typical end use areas of the release liner paper of the invention are abrasive papers for the automotive industry, adhesive label release liners and adhesive tape release liners, but the invention is not exclusively limited to these end uses.

Claims

Claims:
1. A release liner paper that contains a release agent, characterized in that the paper contains a water-soluble or water-dispersible organic fluorochemical comprising a compound that contains at least one fluoroaliphatic group.
2. A release liner paper according to claim 1 , characterized in that the paper contains the fluorochemical as wet end addition in the pulp.
3. A release liner paper according to claim 1 or 2, characterized in that the paper contains the fluorochemical as a surface treatment.
4. A release liner paper according to claim 3, characterized in that the paper contains binders together with the fluorochemical as a surface treatment.
5. A release liner paper according to claim 4, characterized in that the binders are natural polymers or derivatives thereof, such as starch- based binders or carboxymethyl cellulose.
6. A release liner paper according to claim 4, characterized in that the binders are synthetic binders such as styrene-butadiene latex, polyvinyl alcohol, polyvinyl acetate, acrylic latex or mixtures thereof.
7. A release liner paper according to any of claims 1 to 6, characterized in that the fluoroaliphatic group contains a perfluoroalkyl group.
8. A release liner paper according to any of claims 1 to 7, characterized in that the fluoroaliphatic group is linked to a functional group, especially an acid group capable of forming a salt.
9. A release liner paper according to claim 8, characterized in that the fluorochemical comprises a salt of perfluoroalkyl phosphate.
10. A release liner paper according to any of claims 1 to 9, characterized in that the amount of the fluorochemical is 1 to 10 g/m2 of dry solids in a surface treatment and/or 1 to 10 g/m2 of dry solids per each 100 g/m2 of the final product basis weight.
11. A release liner paper according to any of claims 1 to 10, character¬ ized in that its grammage is 50 to 200 g/m2, especially 80 to 150 g/m2.
PCT/FI1999/000578 1998-07-08 1999-06-30 Release liner paper WO2000003089A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981576A FI105117B (en) 1998-07-08 1998-07-08 release Paper
FI981576 1998-07-08

Publications (1)

Publication Number Publication Date
WO2000003089A1 true WO2000003089A1 (en) 2000-01-20

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ID=8552166

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1999/000578 WO2000003089A1 (en) 1998-07-08 1999-06-30 Release liner paper

Country Status (2)

Country Link
FI (1) FI105117B (en)
WO (1) WO2000003089A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005015876A1 (en) * 2005-04-06 2006-10-12 Tesa Ag Use of a high-density paper carrier containing wood pulp as a carrier web for non-adhesive release coating
US8025973B2 (en) 2005-07-22 2011-09-27 Internatonal Paper Company Paper substrate containing a fluorine containing compound and having enhanced grease-resistance and glueability
EP3059344A1 (en) * 2015-02-23 2016-08-24 UPM-Kymmene Corporation A method for manufacturing paper comprising bleached chemithermo-mechanical pulp suitable for a release liner and products and uses thereof
CN106192568A (en) * 2016-08-31 2016-12-07 广东联枫新材料科技有限公司 A kind of coating machine produces one side leaching membrane paper technique
CN108660854A (en) * 2018-05-03 2018-10-16 东莞运城制版有限公司 A kind of release paper matrixes for embossing and preparation method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736164A (en) * 1971-07-16 1973-05-29 Air Prod & Chem Organophobic and hydrophobic surface coatings
US3810772A (en) * 1971-07-16 1974-05-14 Air Prod & Chem Fluorochemical compositions for organophobic sizing of paper products
US5492599A (en) * 1994-05-18 1996-02-20 Minnesota Mining And Manufacturing Company Treated substrate having improved release properties
DE19518107A1 (en) * 1995-05-17 1996-11-21 Drescher Geschaeftsdrucke An easier-opening confidential single sheet letter-cum-envelope

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3736164A (en) * 1971-07-16 1973-05-29 Air Prod & Chem Organophobic and hydrophobic surface coatings
US3810772A (en) * 1971-07-16 1974-05-14 Air Prod & Chem Fluorochemical compositions for organophobic sizing of paper products
US5492599A (en) * 1994-05-18 1996-02-20 Minnesota Mining And Manufacturing Company Treated substrate having improved release properties
DE19518107A1 (en) * 1995-05-17 1996-11-21 Drescher Geschaeftsdrucke An easier-opening confidential single sheet letter-cum-envelope

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Volume 128, (1999), (Columbus, Ohio, USA), page 1, Abstract No. 155734; & JP 10018196 A (SUGIYAMA, KATSUHIKO et al) (20-01-1998). *
STN INTERNATIONAL, File CAPLUS, CAPLUS Accession No. 1977:141054, Document No. 86:141054, NITTO ELECTRIC INDUSTRIAL CO., LTD., "Releasing Agents for Adhesive Tapes"; & JP 52014635 A, 19770203. *
STN INTERNATIONAL, File CAPLUS, CAPLUS Accession No. 1977:172674, Document No. 86:172674, NITTO ELECTRIC INDUSTRIAL CO., LTD., "Releasing Agent"; & JP 52007883 A, 19770121. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005015876A1 (en) * 2005-04-06 2006-10-12 Tesa Ag Use of a high-density paper carrier containing wood pulp as a carrier web for non-adhesive release coating
US8025973B2 (en) 2005-07-22 2011-09-27 Internatonal Paper Company Paper substrate containing a fluorine containing compound and having enhanced grease-resistance and glueability
EP3059344A1 (en) * 2015-02-23 2016-08-24 UPM-Kymmene Corporation A method for manufacturing paper comprising bleached chemithermo-mechanical pulp suitable for a release liner and products and uses thereof
CN106192568A (en) * 2016-08-31 2016-12-07 广东联枫新材料科技有限公司 A kind of coating machine produces one side leaching membrane paper technique
CN108660854A (en) * 2018-05-03 2018-10-16 东莞运城制版有限公司 A kind of release paper matrixes for embossing and preparation method thereof
CN108660854B (en) * 2018-05-03 2021-04-02 东莞运城制版有限公司 Release paper embossing plate and manufacturing method thereof

Also Published As

Publication number Publication date
FI981576A (en) 2000-01-09
FI105117B (en) 2000-06-15
FI981576A0 (en) 1998-07-08

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