EP1242682A2 - Papierstreichmassen mit erhöhter wasserretention - Google Patents
Papierstreichmassen mit erhöhter wasserretentionInfo
- Publication number
- EP1242682A2 EP1242682A2 EP00990658A EP00990658A EP1242682A2 EP 1242682 A2 EP1242682 A2 EP 1242682A2 EP 00990658 A EP00990658 A EP 00990658A EP 00990658 A EP00990658 A EP 00990658A EP 1242682 A2 EP1242682 A2 EP 1242682A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- paper coating
- pva
- coating slip
- polyvinyl alcohol
- 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.)
- Granted
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
- D21H19/36—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
Definitions
- the invention relates to a paper coating slip comprising a polymer dispersed in water with polyvinyl alcohol as a protective colloid (in short PVA-dispersed polymer).
- Aqueous coating compositions are often used to coat water-absorbent (absorbent) substrates.
- Paper coating slips are e.g. applied to base paper or cardboard and the coating obtained dried. Too rapid absorption of water by the substrate is generally disadvantageous for the manufacturing process. It makes it difficult to evenly distribute the coating composition on the substrate and to form a homogeneous coating. In addition, water absorption which is too rapid leads to the paper web tearing off in the coating machine
- the ability of a coating compound to prevent water from being absorbed quickly by absorbent substrates is called water retention.
- a high water retention of the paper coating slip is particularly desirable in the continuous process of paper production.
- the coating of the base paper and the homogeneous distribution as well as the setting of the layer thickness, e.g. with the help of a squeegee, takes place under heavy mechanical stress on the paper web at various points in the continuous process. Premature drying of the coating not only has a negative impact on the quality of the end product, but also hinders a trouble-free and fast manufacturing process.
- EP-A-627450 polymers are already known which were produced in the presence of polyvinyl alcohol as protective colloid and are used as thickeners. Polymers stabilized with polyvinyl alcohol are also described in EP-A-863163. The use of polyvinyl alcohol as an additive to aqueous paper coating slips and to colorants for textiles is disclosed in EP-A-624687 and EP-A-44995.
- the object of the present invention was to improve the water retention of paper coating slips. Accordingly, the paper coating slip defined at the outset was found.
- the paper coating slip according to the invention contains a polymer dispersed with polyvinyl alcohol (PVA) as protective colloid (abbreviated as PVA-dispersed polymer).
- PVA is understood to mean a polymer which comprises at least 10% by weight, in particular at least 20% by weight, based on the polymer, of groups of the formula
- Polyvinyl alcohols are usually obtained by saponification of polyvinyl esters, in particular polyvinyl acetate.
- the PVA can therefore also contain non-saponified structural units derived from vinyl esters.
- the polyvinyl alcohol preferably has a viscosity of 0.1 to 100, in particular 0.1 to 30, particularly preferably 0.5 to 8 mPas, measured on a 4 wt. -% solution of the polyvinyl alcohol in water at 20 ° C (according to DIN 53015).
- the PVA-dispersed polymers can be prepared by polymerizing free-radically polymerizable starting compounds (monomers) in the aqueous phase in the presence of PVA.
- the polymerization is preferably carried out in the presence of at least 0.5 part by weight, particularly preferably at least 2 parts by weight, very particularly preferably at least 26 parts by weight of PVA, in particular at least 40 parts by weight of PVA, based on 100 Parts by weight of monomers.
- at least 0.5 part by weight particularly preferably at least 2 parts by weight, very particularly preferably at least 26 parts by weight of PVA, in particular at least 40 parts by weight of PVA, based on 100 Parts by weight of monomers.
- not more than 250 parts by weight preferably 150 parts by weight of PVA, particularly preferably not more than 100 parts by weight, based on 100 parts by weight of monomers, are used.
- the PVA is usually initially introduced in the aqueous phase.
- other protective colloids or emulsifiers can also be used.
- the polymerization can be carried out in accordance with the generally known method of emulsion polymerization.
- the monomers can be polymerized at from 30 to 140 ° C., as usual, in the presence of a water-soluble initiator, the PVA and, if appropriate, further protective colloids and emulsifiers.
- Suitable initiators are, for example, sodium, potassium and ammonium persulfate, tert. -Butyl hydroperoxides, water-soluble azo compounds or redox initiators, such as H 2 0 / ascorbic acid.
- Additional protective colloids and emulsifiers are e.g. Alkali salts of longer chain fatty acids, alkyl sulfates, alkyl sulfonates, alkylated aryl sulfonates, alkylated biphenyl ether sulfonates, longer chain fatty alcohols and the corresponding alkoxylated products of the sulfates, sulfonates and alcohols mentioned.
- the PVA-dispersed polymer is preferably composed of the following monomers.
- the weight data relate in each case to the total amount of the monomers from which the PVA-dispersed polymer is composed.
- the PVA-dispersed polymer can be used as a binder.
- the PVA-dispersed polymer preferably contains so-called main monomers as a binder, selected from C 1 to C 6 alkyl (meth) acrylates, vinyl aromatics with up to 20 C atoms, vinyl esters of carboxylic acids with 1 to 20 C atoms, vinyl halides, ethylenically unsaturated Nitrile, non-aromatic hydrocarbons with one or two conjugated double bonds or mixtures of these monomers.
- Examples include (meth) acrylic acid alkyl esters with a C 1 -C 8 -alkyl radical, such as methyl methacrylate, methyl acrylate, n-butyl acrylate, ethyl acrylate and 2-ethylhexyl acrylate.
- Suitable vinyl esters of carboxylic acids with 1 to 20 C atoms are, for example, vinyl laurate, stearate, vinyl propionate and inyl acetate.
- Suitable vinylaromatic compounds with up to 20 carbon atoms are vinyltoluene, ⁇ -butylstyrene, 4-n-butylstyrene, 4-n-decylstyrene and preferably styrene.
- Examples of ethylenically unsaturated nitriles are acrylonitrile and methacrylonitrile.
- Vinyl halides are ethylenically unsaturated compounds substituted with chlorine, fluorine or bromine, preferably vinyl chloride and vinylidene chloride.
- butadiene, isoprene and chloroprene and ethylene may be mentioned as non-aromatic hydrocarbons with one or two conjugated olefinic double bonds.
- the PVA stabilized polymer can also contain other monomers, e.g. Monomers containing hydroxy groups, such as hydroxyalkyl acrylates or monomers with Al oxy groups, as can be obtained by alkoxylation of monomers containing hydroxyl groups with alkoxides, in particular ethylene oxide or propylene oxide, monomers with acid or anhydride groups or their salts, e.g. Contain (meth) acrylic acid, maleic acid, vinyl sulfonic acid.
- monomers containing hydroxy groups such as hydroxyalkyl acrylates or monomers with Al oxy groups
- monomers with acid or anhydride groups or their salts e.g. Contain (meth) acrylic acid, maleic acid, vinyl sulfonic acid.
- the PVA-stabilized polymer preferably consists of at least 20% by weight of the main monomers, particularly preferably at least 35% by weight and very particularly preferably at least 50% by weight.
- the PVA-dispersed polymer can also be used as a thickener.
- the PVA preferably contains dispersed polymer in the
- the PVA-dispersed polymer contains not more than 80% by weight, in particular not more than 60% by weight, particularly preferably not more than 50% by weight, of the acid monomers.
- the polymer dispersed in PVA can, in addition to the acid monomers, in particular also contain the main monomers described above and further monomers.
- the acid groups of the PVA-dispersed polymer are preferably at least partially neutralized before later use. Preferably at least 30 mol%, particularly preferably 50 to 100% of the acid groups neutralized.
- Suitable bases are volatile bases such as ammonia or non-volatile bases such as alkali hydroxides.
- the PVA-dispersed polymer obtained after the polymerization can, if desired, be easily spray-dried.
- Free-flowing polymer powders with the above-mentioned PVA protective colloid content are obtained.
- the powders are readily redispersible in water and can therefore also be added to the paper coating slips as a powder.
- the paper coating slip can contain a fluorescent or phosphorescent dye.
- Fluorescent dyes in particular so-called optical brighteners, are preferred.
- Optical brighteners are fluorescent dyes that determine the degree of brightness, e.g. with white coated papers whiteness.
- Stilbene derivatives in particular are known as optical brighteners.
- optical brighteners with a water solubility of at least 1 g, in particular at least 5 g, per liter of water (at 20 ° C.) are preferred.
- the paper coating slip in addition to the PVA present as a protective colloid, also contains PVA which is dissolved in the aqueous phase.
- This additional PVA can e.g. be added to the aqueous phase at any time after the preparation of the PVA-dispersed polymer.
- the PVA contained in the paper coating slip is preferably 5 to 100% by weight, particularly preferably 20 to 100% by weight, very particularly preferably 30 to 100% by weight, of PVA as a protective colloid dispersed in the PVA Polymer and at 0 to 95 wt.%, Particularly preferred
- PVA 0 to 80% by weight and very particularly preferably 0 to 70% by weight of PVA additionally dissolved in water.
- more than 50% by weight of the total amount of PVA or the total amount of PVA can be present as a protective colloid.
- aqueous coating or impregnating composition in particular as a paper coating slip.
- the paper coating slip contains in particular: a) one or more binders
- Component b) is preferably contained. In a preferred embodiment, c) is also included if optical heating is desired.
- the binder a) is preferably a free-radically polymerized polymer, which in total is preferably at least 30% by weight, particularly preferably at least
- Paper coating slips are generally C 1 -C 6 -alkyl (meth) acrylates or their mixtures with vinyl aromatics, in particular styrene, or alternatively non-aromatic hydrocarbons with two conjugated double bonds,
- thickeners such as 35 hydroxymethyl cellulose or concrete are also suitable as thickeners b).
- the thickener or one of the cobinders is preferably the PVA-dispersed polymer.
- the pigment or filler d) is generally white pigment, e.g. Barium sulfate, calcium carbonate, calcium sulfoaluminate, kaolin, talc, titanium dioxide, zinc oxide, chalk or coating clay.
- the paper coating slip preferably has the following weight composition. Paper coating slip:
- binder solid, i.e. without water
- the total amount of the PVA contained in the paper coating slip is preferably 0.05 to 50 parts by weight, particularly preferably 0.1 to 5 parts by weight of PVA, based on 100 parts by weight of the total amount of constituents a) to d).
- the preferred distribution on PVA as a protective colloid and additionally dissolved PVA is as stated above.
- the amount of the PVA presented in the emulsion polymerization depends on whether the PVA-dispersed polymer obtained is used later as a binder or thickener.
- the amount of PVA desired in the later paper coating slip can be achieved with very small amounts of PVA protective colloid, since the amount of binder is much larger than usual amounts of thickener.
- the paper coating slips can contain further constituents.
- Flow aids for the pigments etc.
- the paper coating slips are aqueous paper coating slips.
- the water content can be adjusted depending on the desired viscosity or flow properties.
- the components can be mixed in a known manner.
- the paper coating slips are suitable for coating e.g. of paper or cardboard.
- the paper coating slip can then be applied to the papers or cardboard to be coated by customary methods.
- coated papers or cardboard boxes can be printed in conventional processes, for example offset, high-pressure or gravure printing processes. Good water retention can be observed with the paper coating slip. This prevents the water to be absorbed too quickly by the substrate to be coated, for example paper or cardboard. The optical brightening is also improved.
- a paper coating slip was made from the following ingredients:
- Acronal® S360D from BASF (50%), a binder based on acrylates and styrene
- Blankophor® PSG from Bayer AG, D-5090 Leverkusen 1 (45%), a stilbene derivative containing sulfonate and triazine groups
- the solids content was adjusted to 67% by weight with water and the pH to 8.9-9.1 with sodium hydroxide solution.
- Aerosol® B 37 D solid
- a polyacrylate from BASF a polyacrylate from BASF
- demineralized water demineralized water
- polyvinyl alcohol Moviol 4/88
- iron catalyst Dissolvine E-FE-13 (1%)
- reaction mixture is 15 min. stirred at 75 ° C and then brought to room temperature.
- room temperature 20 g of a 2.5% hydrogen peroxide solution with 20 g of a Lutavit C solution are metered in uniformly over a period of 1 hour.
- An aqueous polymer dispersion with a solids content of 25% is obtained.
- the experimental setup corresponds to that under IIc. 730 g of demineralized water and 90 g of Rhodoviol R 4/20 (Rhône-Poulenc GmbH, 85 mPas, 10% / pH 5.3) are poured in and opened as a template
- a wood-free coating base paper from Scheufeien GmbH + Co. KG, D-73250 Lenningen, with a basis weight of 70 g / m 2 was used as the base paper.
- the paper coating slip was applied on one side with 12 g / m 2 dry film thickness on a laboratory coating machine
- the water retention was measured in the AA-GWR pressure filtration device from Abo Akademi-Gravimetric Water Retention, which was obtained from OY Gradek AB, Mariantie 9, SF-02700 Kauniainen, Finland.
- a polycarbonate membrane, 5.0 ⁇ m pore size, 47 mm was used as a filter
- the device was connected to a compressed air line and a pressure of 4 bar was set.
- Five stapled and weighed filters were placed on the rubber plate, taking care that the 5th filter is still dry after the measurement. If not, increase to 8 or 10.
- the plug was closed with the lever.
- a pressure of 0.5 bar was set by pulling out the pressure setting button.
- Approx. 5 ml of paper coating slip was placed in the metal cylinder. 0.5 bar pressure was applied for 60 seconds.
- the wet filter papers were weighed again. The moisture absorption was multiplied by 1250. The result is the amount of water released in g / m 2 .
- optical brightening was determined with the spectrophotometer Elrepho 2000 from Datacolor GmbH (D-45769 Mari).
- the papers to be checked were stacked at least four times. 5 measurements were carried out per paper sample.
- added dispersion is understood to mean the cobinder or thickener dispersion added to the basic formulation in Examples Ha to IV
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
- Paints Or Removers (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19960862A DE19960862A1 (de) | 1999-12-17 | 1999-12-17 | Papierstreichmassen mit erhöhter Wasserretention |
| DE19960862 | 1999-12-17 | ||
| PCT/EP2000/012274 WO2001044574A2 (de) | 1999-12-17 | 2000-12-06 | Papierstreichmassen mit erhöhter wasserretention |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1242682A2 true EP1242682A2 (de) | 2002-09-25 |
| EP1242682B1 EP1242682B1 (de) | 2004-03-17 |
Family
ID=7932998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00990658A Expired - Lifetime EP1242682B1 (de) | 1999-12-17 | 2000-12-06 | Papierstreichmassen mit erhöhter wasserretention |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US20030166766A1 (de) |
| EP (1) | EP1242682B1 (de) |
| AT (1) | ATE262081T1 (de) |
| CA (1) | CA2394114C (de) |
| DE (2) | DE19960862A1 (de) |
| WO (1) | WO2001044574A2 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE321079T1 (de) | 1999-12-21 | 2006-04-15 | Omnova Solutions Inc | Polyvinylalkoholcopolymerzusammensetzung |
| BRPI0715395A2 (pt) * | 2003-08-08 | 2013-06-25 | Clariant Finance Bvi Ltd | soluÇÕes aquosas de alvejantes àpticos |
| ITRM20040129A1 (it) * | 2004-03-11 | 2004-06-11 | Wittsun Sa | Additivo per patina e relativo processo di produzione. |
| EP1712677A1 (de) * | 2005-04-08 | 2006-10-18 | Clariant International Ltd. | Wässerige Lösungen von optischen Aufhellern |
| EP2054549A1 (de) * | 2006-08-14 | 2009-05-06 | Basf Se | Papierstreichmassen, enthaltend silicasole |
| US20110045313A1 (en) * | 2008-05-01 | 2011-02-24 | Akzo Nobel N.V. | Paper coating compositions |
| CN110878494B (zh) * | 2019-12-03 | 2022-09-13 | 佛山市长盛兴隆装饰材料有限公司 | 一种金属粉水性乳液及制备方法和三聚氰胺木纹纸 |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2460998A (en) * | 1944-03-20 | 1949-02-08 | Stein Hall & Co Inc | Method of coating paper |
| US2710285A (en) * | 1951-08-11 | 1955-06-07 | Davics Young Soap Company | Paper coating composition containing an optical brightener |
| US2851423A (en) * | 1951-08-17 | 1958-09-09 | Switzer Brothers Inc | Fluorescent compositions |
| GB1039540A (en) * | 1963-11-25 | 1966-08-17 | Reed Paper Group Ltd | Improvements in or relating to coating methods |
| US3400008A (en) * | 1964-06-30 | 1968-09-03 | Grace W R & Co | Paper article coated with a novel slip composition |
| US3726820A (en) * | 1964-06-30 | 1973-04-10 | Grace W R & Co | Slip agent composition for spiral-wound paper cans |
| US3532534A (en) * | 1967-02-09 | 1970-10-06 | Us Plywood Champ Papers Inc | Method of making a waterproof polyvinyl alcohol coated paper |
| GB1337983A (en) * | 1970-05-13 | 1973-11-21 | British Aluminium Co Ltd | Stabilised zirconium salts |
| GB1429648A (en) * | 1972-06-20 | 1976-03-24 | Cassio Photographic Paper Co L | Coated photographic paper base |
| CH632117B (de) * | 1977-12-29 | Ciba Geigy Ag | Waessrige praeparate von in wasser schwerloeslichen farbstoffen oder optischen aufhellern. | |
| DE3027829A1 (de) | 1980-07-23 | 1982-03-04 | Cassella Ag, 6000 Frankfurt | Dispersionen optischer aufheller enthaltend pfropfpolymere des pva und die neuen pfropfpolymeren |
| JPS5943069B2 (ja) * | 1980-09-26 | 1984-10-19 | 日本合成化学工業株式会社 | 木材用接着剤 |
| US4926190A (en) * | 1987-02-18 | 1990-05-15 | Ciba-Geigy Corporation | Ink jet recording process using certain benzotriazole derivatives as light stabilizers |
| GB2277749B (en) * | 1993-05-08 | 1996-12-04 | Ciba Geigy Ag | Fluorescent whitening of paper |
| US5705553A (en) * | 1993-05-29 | 1998-01-06 | Hoechst Aktiengesellschaft | Copolymers containing carboxyl groups in aqueous dispersion form or redispersible powder form and their water-soluble salts, processes for their preparation and their use as thickeners in aqueous formulations |
| GB9422280D0 (en) * | 1994-11-04 | 1994-12-21 | Ciba Geigy Ag | Fluorescent whitening agent formulation |
| SE505397C2 (sv) * | 1995-11-09 | 1997-08-18 | Mo Och Domsjoe Ab | Ytbehandlat säkerhethetspapper och förfarande samt anordning för framställning av ytbehandlat säkerhetspapper |
| SE506674C2 (sv) * | 1996-06-05 | 1998-01-26 | Akzo Nobel Surface Chem | Komposition, användning av en cellulosaeter som förtjockare och framställning av en belagd cellulosabaserad ytformad produkt |
| AU5289598A (en) | 1997-03-03 | 1998-09-03 | Rohm And Haas Company | Polymer emulsions and polymer powders therefrom |
-
1999
- 1999-12-17 DE DE19960862A patent/DE19960862A1/de not_active Withdrawn
-
2000
- 2000-12-06 WO PCT/EP2000/012274 patent/WO2001044574A2/de not_active Ceased
- 2000-12-06 AT AT00990658T patent/ATE262081T1/de not_active IP Right Cessation
- 2000-12-06 DE DE50005740T patent/DE50005740D1/de not_active Expired - Lifetime
- 2000-12-06 CA CA002394114A patent/CA2394114C/en not_active Expired - Fee Related
- 2000-12-06 US US10/168,073 patent/US20030166766A1/en not_active Abandoned
- 2000-12-06 EP EP00990658A patent/EP1242682B1/de not_active Expired - Lifetime
-
2004
- 2004-05-19 US US10/847,865 patent/US6964993B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0144574A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19960862A1 (de) | 2001-06-28 |
| ATE262081T1 (de) | 2004-04-15 |
| EP1242682B1 (de) | 2004-03-17 |
| US20030166766A1 (en) | 2003-09-04 |
| DE50005740D1 (de) | 2004-04-22 |
| US6964993B2 (en) | 2005-11-15 |
| CA2394114A1 (en) | 2001-06-21 |
| US20040214941A1 (en) | 2004-10-28 |
| CA2394114C (en) | 2009-05-12 |
| WO2001044574A3 (de) | 2001-12-20 |
| WO2001044574A2 (de) | 2001-06-21 |
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