CA2164154A1 - Coating agent for paper surfaces - Google Patents
Coating agent for paper surfacesInfo
- Publication number
- CA2164154A1 CA2164154A1 CA002164154A CA2164154A CA2164154A1 CA 2164154 A1 CA2164154 A1 CA 2164154A1 CA 002164154 A CA002164154 A CA 002164154A CA 2164154 A CA2164154 A CA 2164154A CA 2164154 A1 CA2164154 A1 CA 2164154A1
- Authority
- CA
- Canada
- Prior art keywords
- coating agent
- agent according
- paper
- polymer
- coating
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- D21H19/02—Metal coatings
- D21H19/08—Metal coatings applied as vapour, e.g. in vacuum
-
- 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
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
The present invention relates to a coating agent for paper surfaces, in particular for paper which is aluminized. The coating agent comprises an aqueous polymer dispersion which comprises dispersed in aqueous phase a mixture of polymer particles having an average particle size of 0.2 to 5µm and particles having an average particle size of smaller than 0.1 µm. The mixing ratio of coarser polymer particles to the finer particles preferably amounts to 1 : 1 to 9 : 1. The coating agent according to the present invention is suitable not only to prepare an evaporation coating with metal, such as aluminum, but also as a primer layer which is applied after application of the metal layer, for example, to render the paper printable.
Description
t~ 3 I 216~1~4 _ _. A costing agent for paper sl~rface~
The present invention relates to a coatin~ agent for paper sur-faces.
Paper surfaces having an excellent smoothness and gloss as well as a reduced permeability rn~y be produced with coating a~ents.
It is known to co~t paper surfaces vvith coating agents made of polym~r dispersions whose dispers~ phases conslst of about 95%
polymer particles having a diarneter of lar~er than 0.003 ~nm.
Usually, these dispersions are mixed with pigrnents or other min-eral small-sized fillers or filler mixtures lexample$ thereof incl~de aerosil, chalk, carbonates, such as calcium carbonate, cl~, etc.), and then applied to the paper surface by ~neans of spread co~ting.
The thickness of the finished layer arnounts to abou~ 0.01 mm. A
surface thus coated is coated with a solution of polyrners in or-ganic solvents to obtain a further technical up~rading of papers used for packagin~. So far, this subsequent coatin~ with polymers dissolved in or~anic solYents has been necessary in parti~ular for th~se paper surfaces which are to be alu~ninized in vacuum. This techn~logy wherein, prior to vacuum met~llizing, solutions of or-ganic polyrners are used to apply a polymeric film on the paper surface cons~nnes lar~e amounts of organic solvents, that is about 5.5 ~ of solvent per m~ of paper, depending on the solids content of the p~lymer solution. With the ~sual operatin~ speed of ~00 m/min. and a width of 1.60 m this res~lts in abo~t 2.6 kg of va-porous solvents per m;nute. Although the solvent can be recov-ered, this involves cornparatively hi~h capital cost with respeet to both the required facitities and the runnin~ operational expenses therefor. The thermal rernoval ~f the solvent vapor is by far more cost-intensive. On the one hand, ~he high initial investrnent for re~oving the solvent is due to the fact that plant and devices 2 216~154 have to be explosion-proof and, on the other hand, that the operatin~ staff must be protected from toxic solvent vapor.
It is also known to coat paper surfaces from an aqueous disper-sion with polymer dispersions having a parti~le size of large~ than 0.01 mm and a dist~ibution rnaximum of about 0.05 mm on the speciflc distribution cllrve. ~lowever, these ~oatings ~re unsuitable for the en~raved roll-technology, i.e., ~hey cannot be used for this purpose. Owin~ to their parti~le size these coatings have corre-spondingly coarse surface structures. After the a~tual drying of the dispersin~ agent, the paper web ~nust additionally be heated under considerable thermal energy expenditure to form an opti-murn film; this in turn requires additional energy to cool the paper web prior to rolling it Up, in order to prevent the indivldual layers from sticking together when wound ~Ip. For this reason, speclal coaters had to be developed and constructed for this technolo~y to eliminate the inherent coagulation tendency of the dispersion systems. As compared to applyin~ the polymer coat from the so-lution in an organic solvent, the filrn thickness tolerance is also a disadvantage. i.e., the polymer film applied from or~anic solvents is n~ore uniform and has a more uniform thickness than the poly-mers applied from aqueous dispersion.
Recently papers have Increasingly been finishe~ in an ecologically beneficial manner in order to conserve natural resour~es and the environment, i.e., products used in finish;ng or production are re-used intelli~ently by recycling them; however, tO a~hieve a suffi-cient surface quality it has not been possible so far 1n the produc-tion of vacuum-metallized paper, in p~rtic~lar aluminized paper, to abstain from a co~ting using lar~e amounts of organic solvents.
It is ac¢ordingly the ~bj~ct of the present invention to provide a coating ag~nt, in particular for paper surfaces to be metallized in vacuum, under ~voidance of organic solvents. The coating agent 3. 216~
rnakes it possible to achieve fronl an aqueous dispersion ~oth a homogeneous coat aftelr elimination of the water and an even layer thickness; more~v~r, it rnay be applied by rneans of en-graved rolls or gravure printing. In particular, the use of engraved-rolls-technology is of importan¢~ because the coating may be rne-ter~d precisely. The oups of the en~raved rolls or also the print rolls clog up after a short operatin~ time. Even in case of a high degree of dilution vvith solids contents of about 13%, this plug-g~e after longer operation periods results in coagulation under the doctor blade.
According to the pressnt invention this object is achieved by a coatir-~ ~gent which comprises dispersed in the aqueous phase ~
n~ixture of polymer particles h~Ying an average particle size of 0.2 to 5 ,L/, preferably 0.3 to 2 ~, as well as particles o~ an average partlcl~ size of smaller than 0.1 ~nn, preferably s~Taller than 0.07 .Llrn.
The rnixing ratio of coarser polyrner particles, which may be cross-linked or ~Incrosslinked, to ~he finer polymer particles, which are present as a microdispersion or hydrosol, may vary within wide ranges, but prefer~bly amounts to 1: 1 ~50; 50) to 9: 1 (9: 1), preferably is in the rang~ of frorn 1.5: 1 ~60: 40) to 3: ~.
Usuall~, the ~queous dispersion cons[sting of polymer particles of larger diameter and of very srnall-sized polymers with hydrosol propefties has dispersin~ agents for the two polymer con~ponents, which advant~geously have different surface tensions. Suita~le dispersants include, for example, fatty al~ohol ethoxylates and/or carboxylic acid salts.
Suitable polymers fof both the ~oarser portion and the small sized micfodispersion or hydrosol in~lude the kno~n polymers applioable for paper coa~ing, preferably based on acrylic es~ers, such as ethyl . . .
acrylate, butyl a~rylate, 2-ethylhexyl acryla~e; as well as polymers ~ based on ethyl/vinyl acetate copolymers, polyurethane~, copoly-mers of acrylat~/vinyl-a&etate, as well as copolymers based on styren~ and ~crylates~
The solids content of the'coating agent accotding to the present invsntion is in the range of 70 ~o ~0% solids or po~ymer ~ontent;
hov~evel, depending on ~he application technolo~ical adjustment, the solids content n~ay vary to a greater extent.
The polymers used aocording to the presen~ invention are knov~n comm~rcial products.
The snnall-s;zed polymer's particle size is so small that the solu-tion appears to be nearly transp~rent and that in case of light transmission it can hardly be vis~Jally detected; ~hat is more, it has nea~ly the same refr~etive index as water. Such products may also be referred to as hydrosols~ The small-sized polymers are not cross-linked because of their hydrosol properties., The coating a~ent ac~o~ding to the present invention meets the hi~hest requirements with respect to quality, Moreover, the coat-ing agent accordin~ to the present invention stands out for ex-traordinary economic efficiency, because metering involving accu-rate adjustment of the layer thlcknesses may be effected by usin~
the engraved-rolls-method, The papers coated w;~h the coating agent acc~rdin~ to the present invention stand out for high homogeneity of the applied layer as well as for an only s~nall layer thickness.tolerance. Thi~ advanta-~eous result is achieved by ~eans of engraved rolls as well as by using the gravure coatin~ method.
~`~ s 216415~
~. .
The present invention will be illustra~ed in more detail w~th refer-ence ~o the follo~Ning dravvin~s.
Flgure 1 shows the distrib~tion of coarser polyme~ particle~ (5) and the finest p~rticles of the hydro~ol ~6); it can be seen that the interspace between the relatively large polyrner particies is filled ~Ip vvith the particles of th~ hydrosol (6) which ~re smaller by factor of up to ~0.
Figure 2 illustrat~s the penetration depth PE into the paper sur-face, the ~Jectof Ptg representing the particle size of the coating.
Figure 3 shows a section throu~h a coated p~per. The ac~ual pa-per layer (3) forn-ed b~ flberg is sealed to the top by the conven-tional paper coatin3 (2) and to the bottom by th~ back finish (4J.
The upper top coat l1 ) does not comprise any fibers of the base paper (value 0), whereas some fibers ~roject into the conventional paper coating ~2) and nlore of thern into the back finish ~4).
The co~tin~ agent accordin~ to the present invention offer~ the further advantage that each polymer component c~n be varied for special objects. For example, the finest component may be de-si~ned soft and flexible so that it penetrates deeper into the paper coat ~2), as is known from experience, (cf. diagram of Fi~ure Z), whereas the coarser dispersion p~icles, ~Nhich are de~ignated to form a scratGh-resistant surf~ce, arrange clo~er to the surf~ce.
In order to vary the su~face properties to an even greater extent, a third Gomponent may be used, e.g., very fine-emulsified syntheti~
wax or polyethylene; for example, to ob~ain hydrophobic surfaces.
The gas permeability may also be controlled. For exarnple, the re-quired high waterproofness may be obtained by a third compo-nent, e.~., prime coatin~ wi~h ethylene-acrylate copolymers to o~tain a ~ater vapo~ barrier. Also, the cap~bility of being : - 21641~ 4 . ..
co-nposted may be influenced by suitable additives, such as ni-trated water-solubie cellulose. It has been found that such an ad-dition may increase the ~pplication possibilities of putrefactive bacteria,resultin~ in sho~ter compostin~ periods of the paper thus coated The coatin~ agent according to the present invention with tvvo differen~ polymer phases is stlitable not only as a coating in prepa-rat;on for metal deposition, in particular in vacuo, but, in addition to that, it rnay also be used as a primer layer which is applied after application o~ the metal layer, ~or exanlple to render thP paper printable. Good adhesion of the printin~ color, such that is does not come off, has up to now only been achieved wlth polylner coatings of org~nic solvents. In the past il w~s fo~nd that the use of aqueous polymer dispersions, e.g., in the cleaning of beer bot-tles which are washed with ~ 2% Iye, resulted in detachrnent o~
the primer layer, i.e., the layer applied on the rnetal layer including the printing ink, ar~d contarnination of the cleaning bath.
It has been surprisingly found that when the coating a~ent accard-in~ to the present invention is applied as primer or prlnting primer on the aluminized surface there is no solubilization o~ primer andlor printing color, thus avoiding any contamina~ion of the washing Iye with substances already present on the paper surface.
The follovving example vvill illustrate the present invention in more detail, parts meaning parts ~y weight.
70 parts of an aqueous acrylic ester dispersion having a parti~le size of 0.5 to 2 ~m (type: ~efasol ~06* manufacturer: Lefatex-Chemie GmbH~ are mixed under s~irring with 30 parts of hydrosol having a particle size of 0.05 ll (type; Hydrosol 900, n~anufac-turer: Lefatex), resulting in a liquid ernulsion paint having a pol~-mer content of 37 (+ 2%~. This paint is applied on a label paper of *Trade mark - ~ 21641~
. . .
70 glm~ by n~eans of an en~raved roll an~ then dried. A ~lossy, contin~lous film remains on the paper, ~vhich can excellently be metallized. ~fter high-vacuum metal deposition using aluminum, th~ sensitive alurninum layer is protected with the primer which i~
applied by means of engraved ~olls and then dried.
In additi~n, the primer serves as a primer for possible fu~ther treatments, e.~., prints.
Another advantage o~ the coating agent according to the present invention is the high solids content ~vith usual service ~tiscosities.
The polynlers of ~he art dissolved in the organic solvent have a Yiscosity o~ ~out 18 to 22 seconds in the ~IN-be~ker at a solids content nf 20%. In the used en~raved roll technology vrith the required visc~sitie$, a solids content of 40% (polymer) nlay be achieved res~lting in ~ considerable cost reduction.
The present invention relates to a coatin~ agent for paper sur-faces.
Paper surfaces having an excellent smoothness and gloss as well as a reduced permeability rn~y be produced with coating a~ents.
It is known to co~t paper surfaces vvith coating agents made of polym~r dispersions whose dispers~ phases conslst of about 95%
polymer particles having a diarneter of lar~er than 0.003 ~nm.
Usually, these dispersions are mixed with pigrnents or other min-eral small-sized fillers or filler mixtures lexample$ thereof incl~de aerosil, chalk, carbonates, such as calcium carbonate, cl~, etc.), and then applied to the paper surface by ~neans of spread co~ting.
The thickness of the finished layer arnounts to abou~ 0.01 mm. A
surface thus coated is coated with a solution of polyrners in or-ganic solvents to obtain a further technical up~rading of papers used for packagin~. So far, this subsequent coatin~ with polymers dissolved in or~anic solYents has been necessary in parti~ular for th~se paper surfaces which are to be alu~ninized in vacuum. This techn~logy wherein, prior to vacuum met~llizing, solutions of or-ganic polyrners are used to apply a polymeric film on the paper surface cons~nnes lar~e amounts of organic solvents, that is about 5.5 ~ of solvent per m~ of paper, depending on the solids content of the p~lymer solution. With the ~sual operatin~ speed of ~00 m/min. and a width of 1.60 m this res~lts in abo~t 2.6 kg of va-porous solvents per m;nute. Although the solvent can be recov-ered, this involves cornparatively hi~h capital cost with respeet to both the required facitities and the runnin~ operational expenses therefor. The thermal rernoval ~f the solvent vapor is by far more cost-intensive. On the one hand, ~he high initial investrnent for re~oving the solvent is due to the fact that plant and devices 2 216~154 have to be explosion-proof and, on the other hand, that the operatin~ staff must be protected from toxic solvent vapor.
It is also known to coat paper surfaces from an aqueous disper-sion with polymer dispersions having a parti~le size of large~ than 0.01 mm and a dist~ibution rnaximum of about 0.05 mm on the speciflc distribution cllrve. ~lowever, these ~oatings ~re unsuitable for the en~raved roll-technology, i.e., ~hey cannot be used for this purpose. Owin~ to their parti~le size these coatings have corre-spondingly coarse surface structures. After the a~tual drying of the dispersin~ agent, the paper web ~nust additionally be heated under considerable thermal energy expenditure to form an opti-murn film; this in turn requires additional energy to cool the paper web prior to rolling it Up, in order to prevent the indivldual layers from sticking together when wound ~Ip. For this reason, speclal coaters had to be developed and constructed for this technolo~y to eliminate the inherent coagulation tendency of the dispersion systems. As compared to applyin~ the polymer coat from the so-lution in an organic solvent, the filrn thickness tolerance is also a disadvantage. i.e., the polymer film applied from or~anic solvents is n~ore uniform and has a more uniform thickness than the poly-mers applied from aqueous dispersion.
Recently papers have Increasingly been finishe~ in an ecologically beneficial manner in order to conserve natural resour~es and the environment, i.e., products used in finish;ng or production are re-used intelli~ently by recycling them; however, tO a~hieve a suffi-cient surface quality it has not been possible so far 1n the produc-tion of vacuum-metallized paper, in p~rtic~lar aluminized paper, to abstain from a co~ting using lar~e amounts of organic solvents.
It is ac¢ordingly the ~bj~ct of the present invention to provide a coating ag~nt, in particular for paper surfaces to be metallized in vacuum, under ~voidance of organic solvents. The coating agent 3. 216~
rnakes it possible to achieve fronl an aqueous dispersion ~oth a homogeneous coat aftelr elimination of the water and an even layer thickness; more~v~r, it rnay be applied by rneans of en-graved rolls or gravure printing. In particular, the use of engraved-rolls-technology is of importan¢~ because the coating may be rne-ter~d precisely. The oups of the en~raved rolls or also the print rolls clog up after a short operatin~ time. Even in case of a high degree of dilution vvith solids contents of about 13%, this plug-g~e after longer operation periods results in coagulation under the doctor blade.
According to the pressnt invention this object is achieved by a coatir-~ ~gent which comprises dispersed in the aqueous phase ~
n~ixture of polymer particles h~Ying an average particle size of 0.2 to 5 ,L/, preferably 0.3 to 2 ~, as well as particles o~ an average partlcl~ size of smaller than 0.1 ~nn, preferably s~Taller than 0.07 .Llrn.
The rnixing ratio of coarser polyrner particles, which may be cross-linked or ~Incrosslinked, to ~he finer polymer particles, which are present as a microdispersion or hydrosol, may vary within wide ranges, but prefer~bly amounts to 1: 1 ~50; 50) to 9: 1 (9: 1), preferably is in the rang~ of frorn 1.5: 1 ~60: 40) to 3: ~.
Usuall~, the ~queous dispersion cons[sting of polymer particles of larger diameter and of very srnall-sized polymers with hydrosol propefties has dispersin~ agents for the two polymer con~ponents, which advant~geously have different surface tensions. Suita~le dispersants include, for example, fatty al~ohol ethoxylates and/or carboxylic acid salts.
Suitable polymers fof both the ~oarser portion and the small sized micfodispersion or hydrosol in~lude the kno~n polymers applioable for paper coa~ing, preferably based on acrylic es~ers, such as ethyl . . .
acrylate, butyl a~rylate, 2-ethylhexyl acryla~e; as well as polymers ~ based on ethyl/vinyl acetate copolymers, polyurethane~, copoly-mers of acrylat~/vinyl-a&etate, as well as copolymers based on styren~ and ~crylates~
The solids content of the'coating agent accotding to the present invsntion is in the range of 70 ~o ~0% solids or po~ymer ~ontent;
hov~evel, depending on ~he application technolo~ical adjustment, the solids content n~ay vary to a greater extent.
The polymers used aocording to the presen~ invention are knov~n comm~rcial products.
The snnall-s;zed polymer's particle size is so small that the solu-tion appears to be nearly transp~rent and that in case of light transmission it can hardly be vis~Jally detected; ~hat is more, it has nea~ly the same refr~etive index as water. Such products may also be referred to as hydrosols~ The small-sized polymers are not cross-linked because of their hydrosol properties., The coating a~ent ac~o~ding to the present invention meets the hi~hest requirements with respect to quality, Moreover, the coat-ing agent accordin~ to the present invention stands out for ex-traordinary economic efficiency, because metering involving accu-rate adjustment of the layer thlcknesses may be effected by usin~
the engraved-rolls-method, The papers coated w;~h the coating agent acc~rdin~ to the present invention stand out for high homogeneity of the applied layer as well as for an only s~nall layer thickness.tolerance. Thi~ advanta-~eous result is achieved by ~eans of engraved rolls as well as by using the gravure coatin~ method.
~`~ s 216415~
~. .
The present invention will be illustra~ed in more detail w~th refer-ence ~o the follo~Ning dravvin~s.
Flgure 1 shows the distrib~tion of coarser polyme~ particle~ (5) and the finest p~rticles of the hydro~ol ~6); it can be seen that the interspace between the relatively large polyrner particies is filled ~Ip vvith the particles of th~ hydrosol (6) which ~re smaller by factor of up to ~0.
Figure 2 illustrat~s the penetration depth PE into the paper sur-face, the ~Jectof Ptg representing the particle size of the coating.
Figure 3 shows a section throu~h a coated p~per. The ac~ual pa-per layer (3) forn-ed b~ flberg is sealed to the top by the conven-tional paper coatin3 (2) and to the bottom by th~ back finish (4J.
The upper top coat l1 ) does not comprise any fibers of the base paper (value 0), whereas some fibers ~roject into the conventional paper coating ~2) and nlore of thern into the back finish ~4).
The co~tin~ agent accordin~ to the present invention offer~ the further advantage that each polymer component c~n be varied for special objects. For example, the finest component may be de-si~ned soft and flexible so that it penetrates deeper into the paper coat ~2), as is known from experience, (cf. diagram of Fi~ure Z), whereas the coarser dispersion p~icles, ~Nhich are de~ignated to form a scratGh-resistant surf~ce, arrange clo~er to the surf~ce.
In order to vary the su~face properties to an even greater extent, a third Gomponent may be used, e.g., very fine-emulsified syntheti~
wax or polyethylene; for example, to ob~ain hydrophobic surfaces.
The gas permeability may also be controlled. For exarnple, the re-quired high waterproofness may be obtained by a third compo-nent, e.~., prime coatin~ wi~h ethylene-acrylate copolymers to o~tain a ~ater vapo~ barrier. Also, the cap~bility of being : - 21641~ 4 . ..
co-nposted may be influenced by suitable additives, such as ni-trated water-solubie cellulose. It has been found that such an ad-dition may increase the ~pplication possibilities of putrefactive bacteria,resultin~ in sho~ter compostin~ periods of the paper thus coated The coatin~ agent according to the present invention with tvvo differen~ polymer phases is stlitable not only as a coating in prepa-rat;on for metal deposition, in particular in vacuo, but, in addition to that, it rnay also be used as a primer layer which is applied after application o~ the metal layer, ~or exanlple to render thP paper printable. Good adhesion of the printin~ color, such that is does not come off, has up to now only been achieved wlth polylner coatings of org~nic solvents. In the past il w~s fo~nd that the use of aqueous polymer dispersions, e.g., in the cleaning of beer bot-tles which are washed with ~ 2% Iye, resulted in detachrnent o~
the primer layer, i.e., the layer applied on the rnetal layer including the printing ink, ar~d contarnination of the cleaning bath.
It has been surprisingly found that when the coating a~ent accard-in~ to the present invention is applied as primer or prlnting primer on the aluminized surface there is no solubilization o~ primer andlor printing color, thus avoiding any contamina~ion of the washing Iye with substances already present on the paper surface.
The follovving example vvill illustrate the present invention in more detail, parts meaning parts ~y weight.
70 parts of an aqueous acrylic ester dispersion having a parti~le size of 0.5 to 2 ~m (type: ~efasol ~06* manufacturer: Lefatex-Chemie GmbH~ are mixed under s~irring with 30 parts of hydrosol having a particle size of 0.05 ll (type; Hydrosol 900, n~anufac-turer: Lefatex), resulting in a liquid ernulsion paint having a pol~-mer content of 37 (+ 2%~. This paint is applied on a label paper of *Trade mark - ~ 21641~
. . .
70 glm~ by n~eans of an en~raved roll an~ then dried. A ~lossy, contin~lous film remains on the paper, ~vhich can excellently be metallized. ~fter high-vacuum metal deposition using aluminum, th~ sensitive alurninum layer is protected with the primer which i~
applied by means of engraved ~olls and then dried.
In additi~n, the primer serves as a primer for possible fu~ther treatments, e.~., prints.
Another advantage o~ the coating agent according to the present invention is the high solids content ~vith usual service ~tiscosities.
The polynlers of ~he art dissolved in the organic solvent have a Yiscosity o~ ~out 18 to 22 seconds in the ~IN-be~ker at a solids content nf 20%. In the used en~raved roll technology vrith the required visc~sitie$, a solids content of 40% (polymer) nlay be achieved res~lting in ~ considerable cost reduction.
Claims (9)
1. A coating agent for the coating of paper surfaces, in particular for paper to be aluminized, comprising an aqueous polymer dis-persion, characterized in that it comprises dispersed in aqueous phase a mixture of polymer particles having an average particle size of 0.2 to 5 µ, preferably 0.3 to 2 µ, and particles having an average particle size of smaller than 0.1 µm, preferably smaller than 0.07.
2. The coating agent according to claim 1 characterized in that the mixing ratio of coarser polymer particles to the finer particles is in the range of 1 : 1 to 9 : 1, preferably in the range of 1.5 : 1 to
3 : 1.
3. The coating agent according to claim 1 or 2 characterized in that it comprises different dispersing agents for the two polymer components with a different surface tension.
3. The coating agent according to claim 1 or 2 characterized in that it comprises different dispersing agents for the two polymer components with a different surface tension.
4. The coating agent according to claim 1 to 3 characterized in that the coating agent comprises thickeners, preferably based on cellulose.
5. The coating agent according to claim 1 to 4 characterized in that it comprises pigments with a physical barrier action, prefera-bly plate-like pigments based on mica, layered silicates, and/or clay.
6. The coating agent according to any one of claims 1 to 5 char-acterized in that at least one component is dyed with a water-soluble colorant.
7. The coating agent according to any one of claims 1 to 6 char-acterized in that it comprises a surface-active additive, preferably silicone oil, a fluorinated tenside and/or a smoothing agent, pref-erably wax or aluminum stearate.
8. The coating agent according to any one of claims 1 to 7 char-acterized in that the softening range of one polymer component is reduced by an additive, preferably of ethylene/vinyl-acetate co-polymers, to such an extent that the coating is heat sealable.
9. The coating agent according to any one of claims 1 to 8 char-acterized by a solids content of 20 to 50%, relative to the polymer content.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9419333U DE9419333U1 (en) | 1994-12-02 | 1994-12-02 | Coating agents for paper surfaces |
| DEG9419333.9 | 1994-12-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2164154A1 true CA2164154A1 (en) | 1996-06-03 |
Family
ID=6916896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002164154A Abandoned CA2164154A1 (en) | 1994-12-02 | 1995-11-30 | Coating agent for paper surfaces |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0715020B1 (en) |
| AT (1) | ATE195010T1 (en) |
| CA (1) | CA2164154A1 (en) |
| DE (2) | DE9419333U1 (en) |
| FI (1) | FI955796A (en) |
| SI (1) | SI0715020T1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7740914B2 (en) * | 2003-12-30 | 2010-06-22 | Sarriopapel Y Celulosa, S.A. | Method to manufacture metallized paper with curtain coating |
| CN104562841A (en) * | 2014-12-26 | 2015-04-29 | 上海维凯光电新材料有限公司 | Waterborne environment-friendly direct-plating beer bottle label base and surface paint with ink retaining performance |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9823499D0 (en) * | 1998-10-27 | 1998-12-23 | Proman Chem Ltd | Barrier coatings |
| ITUD20030221A1 (en) * | 2003-11-11 | 2005-05-12 | Metalpack Srl | PROCEDURE FOR THE PRODUCTION OF METALLIC PAPER AND METALLIC PAPER PRODUCED BY SUCH PROCEDURE. |
| CN105821706B (en) * | 2015-09-14 | 2017-07-07 | 上海洛法化工有限公司 | A kind of curtain coating dope viscosity modifier and its preparation technology |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3113888A (en) * | 1961-03-03 | 1963-12-10 | Nat Starch Chem Corp | Direct method for metalization of cast-coated paper |
| US3779800A (en) * | 1968-05-27 | 1973-12-18 | Dow Chemical Co | Coatings containing plastic pigments |
| AU5961680A (en) * | 1979-06-29 | 1981-01-08 | Mitsui Petrochemical Industries, Ltd. | Metallised paper |
| DE3017543A1 (en) * | 1980-05-08 | 1981-11-26 | Bayer Ag, 5090 Leverkusen | AQUEOUS DISPERSIONS BASED ON (METH) ACRYLIC ACID ALKYLESTER POLYMERISATES WITH TWO EXCELLENT, PRACTICALLY NOT OVERLAPPING MAXIMAS IN PARTICLE SIZE DISTRIBUTION WITHIN SPECIFIC PARTICLE LARGE RANGE |
| DE3036969A1 (en) * | 1980-10-01 | 1982-05-13 | Hoechst Ag, 6000 Frankfurt | PROTECTIVE COLLOID-FREE PLASTIC DISPERSIONS WITH BIMODAL PARTICLE SIZE DISTRIBUTION |
| DE3225658C1 (en) * | 1982-07-09 | 1984-01-05 | Zanders Feinpapiere AG, 5060 Bergisch Gladbach | Metallized paper and process for making and using same |
| JPS6028463A (en) * | 1983-07-26 | 1985-02-13 | Nippon Paint Co Ltd | Aqueous coating composition |
| DE3405651A1 (en) * | 1984-02-17 | 1985-08-22 | Röhm GmbH, 6100 Darmstadt | POWDERED EMULSION POLYMERISATES AND METHOD FOR THE PRODUCTION THEREOF |
| AU557547B2 (en) * | 1984-08-29 | 1986-12-24 | National Starch & Chemical Corporation | Aqueous coating for meatllised paper |
| US4824877A (en) * | 1988-02-02 | 1989-04-25 | Dow Corning Corporation | High polymer content silicone emulsions |
| US5258424A (en) * | 1988-06-15 | 1993-11-02 | Nippon Paint Co., Ltd. | Aqueous coating composition capable of forming a coating with improved moisture permeability |
| DE4029491A1 (en) * | 1990-09-18 | 1992-03-19 | Feldmuehle Ag | Paper with satinised overcoat and top coat on one side - contg. synthetic resin binder, natural binder and opt. pigment, useful for label |
| DE59104971D1 (en) * | 1991-05-31 | 1995-04-20 | Sellotape Ag | Self-adhesive acrylate copolymers, processes for their preparation, and self-adhesive fabrics containing them. |
| JPH05195487A (en) * | 1992-01-14 | 1993-08-03 | Kanzaki Paper Mfg Co Ltd | Metallic deposited paper |
| FR2712296B1 (en) * | 1993-11-10 | 1996-01-12 | Rhone Poulenc Chimie | Latex binder for coating composition. |
| DE4340943A1 (en) * | 1993-12-01 | 1995-06-08 | Hoechst Ag | Aqueous dispersion of fluoropolymers, their production and use for coatings |
-
1994
- 1994-12-02 DE DE9419333U patent/DE9419333U1/en not_active Expired - Lifetime
-
1995
- 1995-11-29 DE DE59508600T patent/DE59508600D1/en not_active Expired - Fee Related
- 1995-11-29 EP EP95118737A patent/EP0715020B1/en not_active Expired - Lifetime
- 1995-11-29 AT AT95118737T patent/ATE195010T1/en not_active IP Right Cessation
- 1995-11-29 SI SI9530423T patent/SI0715020T1/en unknown
- 1995-11-30 CA CA002164154A patent/CA2164154A1/en not_active Abandoned
- 1995-12-01 FI FI955796A patent/FI955796A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7740914B2 (en) * | 2003-12-30 | 2010-06-22 | Sarriopapel Y Celulosa, S.A. | Method to manufacture metallized paper with curtain coating |
| CN104562841A (en) * | 2014-12-26 | 2015-04-29 | 上海维凯光电新材料有限公司 | Waterborne environment-friendly direct-plating beer bottle label base and surface paint with ink retaining performance |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0715020A1 (en) | 1996-06-05 |
| FI955796A (en) | 1996-06-03 |
| DE9419333U1 (en) | 1995-01-26 |
| SI0715020T1 (en) | 2000-10-31 |
| ATE195010T1 (en) | 2000-08-15 |
| EP0715020B1 (en) | 2000-07-26 |
| FI955796A0 (en) | 1995-12-01 |
| DE59508600D1 (en) | 2000-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |