Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D193/00—Coating compositions based on natural resins; Coating compositions based on derivatives thereof
  • C09D193/04—Rosin
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/02—Emulsion paints including aerosols
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/61—Additives non-macromolecular inorganic
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/60—Additives non-macromolecular
  • C09D7/63—Additives non-macromolecular organic
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
  • C09D7/40—Additives
  • C09D7/65—Additives macromolecular
• • 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
• • 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
• • 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
  • D21H19/46—Non-macromolecular organic compounds

Definitions

• the present invention provides a water-based emulsion moisture-proof coating agent, which has enhanced carbon neutrality by using rosins, which are biological components instead of fossil fuel-derived components, as main components, a method for producing moisture-proof paper using the same, and
• the present invention relates to paper having a moisture-proof coating agent as a coating layer.
• Laminated paper laminated with a polyolefin resin such as polyethylene has conventionally been widely used for paper and paperboard required to be moisture-proof because of its excellent moisture-proofness and low cost.
• laminated paper has a problem of low recyclability, there has been an increasing trend in recent years to provide moisture-proof performance by coating paper and paperboard with a resin as a method of improving this recyclability.
• Carboxyl group-containing styrene-acrylic copolymer as a moisture-proof resin composition that improves recyclability (disaggregation) by resin coating, increases biodegradability by coating consisting of biological components, and reduces environmental load.
• Patent Document 1 styrene-butadiene synthetic rubber latex
• Patent Document 2 a resin composition containing cellulose ester, shellac, rosin or cellulose ester, wax, and rosin.
• Patent Document 3 a paper straw using paper as a base material and rosin as a waterproof layer.
• a highly carbon-neutral resin composition and resin-coated barrier paper are also known that use rosins known as plant-derived materials and combine them with inorganic compounds.
• a paper sheet forming a biodegradable resin layer such as rosin mixed with a layered silicate compound (Patent Document 4), a cyclic olefin resin, an acid-modified low molecular weight compound such as an acid-modified rosin, and an interlayer ion.
• a barrier resin composition comprising an organic-inorganic composite in which an organic onium compound is intercalated in a layered silicate compound (Patent Document 5) is disclosed.
• JP-A-11-247094 Japanese Patent Publication No. 2016-504465 JP 2020-138014 A Japanese Patent Application Laid-Open No. 2003-13391 JP 2017-43691 A
• Patent Document 1 Although rosin, which is a biologically derived component, is contained in the composition solid content at a maximum of 30% by weight, the remaining 70% by weight or more is from a fossil fuel-derived component such as a styrene-acrylic copolymer. Become. As the resin layer is finely crushed, the possibility of large pieces being made into paper is reduced, and the recyclability of used paper is improved. It is discharged out of the papermaking system together with the waste water, and most of it is incinerated as paper sludge. Since 70% by mass or more of this resin layer is composed of fossil fuel-derived components, the carbon neutrality is still unsatisfactory.
• a fossil fuel-derived component such as a styrene-acrylic copolymer.
• Patent Document 2 compounds such as cellulose ester, shellac, and rosin, which are biological components, are used, but organic solvents, which are components derived from fossil fuels, are added to about 75% to about 80% of the coating liquid. It was dissolved by use, and the carbon neutrality as a coating liquid remained low.
• Patent Document 3 by impregnating or coating paper with rosin as an organic solvent solution, water resistance is improved while reducing the environmental load at the time of disposal of paper straws. It is used at 50 to 75% by mass in the coating liquid, and its carbon neutrality remains low. Moreover, the moisture resistance of paper is not studied at all.
• Patent Document 4 a thin film of inorganic oxide is provided on the biodegradable resin layer in order to improve gas barrier properties, which is not preferable from the viewpoint of recyclability.
• Patent Literature 5 relates to a melt-kneaded molded body, and does not mention water-based resin coating on paper.
• the present invention provides a water-based emulsion moisture-proof coating agent that is excellent in moisture resistance and carbon neutrality by minimizing the use of fossil fuel-derived components and using rosins, which are biological components, as the main component.
• the task is to provide
• a moisture-proof coating agent that is water-based and yet maintains moisture-proofness, is highly carbon-neutral, and has a low environmental impact because it is mainly composed of rosins, which are plant-derived components.
• the moisture-proof coating agent of the present invention contains rosins (a), a dispersant having an anionic group (b), a flat layered silicate mineral (c), a cationic resin (d), and water.
• Rosins (a) refer to raw rosins obtained from plants and/or rosins partially or wholly chemically modified by acid modification, esterification, or the like. Furthermore, those obtained by neutralizing some or all of the acid groups contained therein with an alkaline compound are included.
• rosins (a) include raw rosins such as gum rosin, wood rosin and tall oil rosin, hydrogenated rosins obtained by adding hydrogen to raw rosins, and ⁇ , ⁇ -unsaturated rosins such as maleic acid and fumaric acid. Acid-modified rosins obtained by addition reaction of dicarboxylic acids, and esterified rosins obtained by esterifying these rosins with hydroxy group-containing compounds such as ethanediol and pentaerythritol are exemplified.
• the production area of the raw material rosin is not particularly limited, and examples thereof include China, Vietnam, Indonesia, and Brazil.
• gum rosin, its acid-modified rosin, and esterified rosin are preferred.
• alkaline compounds used for neutralization include ammonia, alkylolamines such as ethanolamine and triethanolamine, alkylalkylolamines such as dimethylethanolamine and methyldiethanolamine, sodium hydroxide and potassium hydroxide.
• Alkali metal hydroxides are mentioned.
• ammonia is preferred. Ammonia easily evaporates from the acid group when the coating film is dried, and increases the hydrophobicity of the rosin, resulting in excellent moisture resistance of the coating film after drying.
• the mass ratio of the rosin (a) contained in the moisture-proof coating agent of the present invention preferably satisfies the following formula. Rosins (a) / (total amount of organic compounds in moisture-proof coating agent) ⁇ 100 ⁇ 70 (%) Within this range, even when disposed by incineration, etc., the concentration of carbon dioxide in the atmosphere is reduced compared to conventional technology due to carbon neutrality due to the fact that rosin, which is a plant-derived component, is the main component. and can contribute to curbing the rate of global warming. More preferably, the mass ratio is 80% or more.
• the organic compound refers to, among carbon compounds, simple carbon such as graphite and diamond, carbides such as silicon carbide and calcium carbide, oxides such as carbon monoxide and carbon dioxide, carbon disulfide and carbonyl sulfide, and the like.
• sulfides such as carbon nitride, carbonates such as sodium carbonate and calcium carbonate, hydrogen carbonates such as sodium hydrogen carbonate and calcium hydrogen carbonate, hydrogen cyanide, cyanates such as sodium cyanide and potassium cyanide, thiocyanic acid, Compounds excluding thiocyanates such as sodium thiocyanate and potassium thiocyanate, halides such as phosgene and carbon tetrachloride, metal carbonyls such as nickel carbonyl and cobalt carbonyl, and metal cyano complexes such as zinc cyano complexes and copper cyano complexes Point.
• Dispersant (b) having anionic group is used to stably disperse the rosin (a) in the water-based emulsion moisture-proof coating agent.
• the dispersant (b) containing an anionic group is roughly classified into an anionic dispersant and an amphoteric dispersant. Furthermore, each of them includes a synthetic dispersant such as a synthetic low-molecular-weight dispersant, a synthetic high-molecular-weight dispersant, a natural low-molecular-weight dispersant, a natural high-molecular-weight dispersant, and a modified natural high-molecular-weight dispersant. It is classified as a drug.
• anionic dispersants include anionic synthetic low-molecular-weight dispersants such as sodium alkylbenzenesulfonate, ammonium alkylsulfate or sodium dialkylsulfosuccinate, and anionic synthetic polymer dispersants such as styrene/acrylic polymer dispersants.
• anionic natural low-molecular dispersants such as surfactin or sophorolipid; and anionic modified natural high-molecular dispersants such as carboxymethylcellulose, octenylsuccinic anhydride-modified starch, and hydroxypropylxanthan gum.
• amphoteric dispersants include amphoteric synthetic low-molecular dispersants such as betaine alkyldimethylaminoacetate and monosodium alkylaminodiacetate, amphoteric natural polymer dispersants such as casein, lecithin (hydrogenated products, water including oxides) and amphoteric natural low-molecular-weight dispersants.
• an alkali compound such as ammonia
• synthetic polymer dispersants and/or natural polymer dispersants are preferable from the standpoint of availability and cost, and at least one selected from styrene/acrylic polymer dispersants, casein and lecithin. It is more preferable to have Casein is most preferable from the viewpoints of emulsifiability of rosins, dispersion stability of emulsions, and moisture resistance of coating films after drying.
• a preferred ratio of the dispersant (b) contained in the moisture-proof coating agent is 1 to 20% by mass relative to the rosin (a), and 1 to 10% by mass for a synthetic polymer dispersant, natural If it is a polymer dispersant, it is 3 to 20% by mass.
• the styrene-acrylic polymer dispersant in the present invention is a monomer having an anionic functional group, styrene, and acrylate as constituent units, as long as they contain 50% by mass or more of the constituent units of the polymer. It is preferable to have 70% by mass or more of a monomer having an anionic functional group, styrene, and acrylate as structural units of the polymer.
• the flat layered silicate mineral (c) is a layered silicate mineral that is a clay mineral and has an aspect ratio (ratio of diameter to thickness) exceeding 1.
• layered silicate minerals include kaolin, talc, pyrophyllite, hectorite, montmorillonite, saponite, vermiculite, mica, and synthetic mica.
• kaolin, montmorillonite, mica, or synthetic mica are preferred from the viewpoint of moisture resistance.
• synthetic mica is particularly preferable because it has fluorine atoms in its crystal structure and has a high aspect ratio, which works advantageously for improving moisture resistance.
• One or more of these can be used in combination.
• a flat layered silicate mineral having an average particle size of 5 ⁇ m or more and an aspect ratio of 50 or more is more preferable. Within this range, the moisture resistance of the coating film after drying is excellent.
• the flat layered silicate mineral (c) is contained in a ratio of 3 to 100 parts by mass with respect to 100 parts of the total mass of the rosin (a) and the dispersant (b) having an anionic group. It is preferable in expressing the performance.
• the cationic resin (d) is not particularly limited as long as it improves the dispersibility of the flat layered silicate mineral (c). Suitable for this application are those that, when mixed with the silicate mineral (c), do not cause excessive agglomeration or thickening to a level that makes coating difficult.
• Examples of the cationic resin (d) include polyamine resins, polyamide resins, polyamidepolyamine resins and derivatives thereof, polyallylamine resins, polydiallylamine resins, dicyandiamide condensates, and polyethyleneimine resins.
• a polyamide polyamine resin or the like may be reacted with epichlorohydrin, urea, glyoxal, formaldehyde or the like.
• the cationic resin (d) is preferably polyamide polyamine resins and derivatives thereof.
• Polyamide polyamine resin is a reaction product of polycarboxylic acid and / or polycarboxylic acid derivative and polyamipolyamine, for example, aliphatic dibasic carboxylic acid and / or derivative such as acid anhydride and polyalkylene polyamine are polymerized
• Polyamidepolyamine resin can be obtained by reacting the polyamidopolyamine resin with epihalohydrin to obtain polyamidopolyamine-epichlorohydrin resin, which is a derivative of polyamidopolyamine resin.
• a derivative of a polyamidepolyamine resin which is a derivative of a polyamidepolyamine resin
• a derivative of a polyamidepolyamine resin can be obtained by polymerizing a derivative such as an aliphatic dibasic carboxylic acid and/or an acid anhydride and then reacting it with urea.
• Aliphatic dibasic carboxylic acids include malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, etc. Industrially, adipic acid is preferred.
• derivatives of aliphatic dibasic carboxylic acids include acid anhydrides of the above acids and lower alcohol (methyl, ethyl, propyl) esters of the above acids.
• Esters, adipate methyl ester are preferred.
• Polyalkylenepolyamines include diethylenetriamine, triethylenetetramine, tetraethylenepentamine, iminobispropylamine and the like, but industrially, diethylenetriamine is preferred.
• the cationic resin (d) preferably has a degree of cationization at pH 3 of at least 0.5 meq/g ⁇ solids to 5.0 meq/g ⁇ solids. Within this range, when mixed with rosins (a), dispersants having anionic groups (b), and flat layered silicate minerals (c), there is no aggregation or extreme thickening, and high moisture resistance is achieved. Obtainable.
• the degree of cationization can be measured by a colloid titration method (titration with polyvinyl potassium sulfate (PVSK)).
• the cationic resin (d) has a weight-average molecular weight of 500 to 50,000, and is mixed with the rosins (a), the dispersant having an anionic group (b), and the flat layered silicate mineral (c). It is preferable because aggregation and thickening at the time are suppressed.
• the weight average molecular weight of the cationic resin (d) can be measured by the GPC-MALS method using a multi-angle light scattering detector connected to GPC under the following measurement conditions.
• GPC body Agilent Technologies LC1100 series Column: SHODEX SB806M HQ manufactured by Showa Denko K.K. Eluent: N/15 phosphate buffer containing N/10 sodium nitrate (pH 3)
• Detector 1 Wyatt Technology's multi-angle light scattering detector DAWN
• Detector 2 Suggestive refractive index detector RI-101 manufactured by Showa Denko Co., Ltd.
• the content of the cationic resin (d) is 1 to 25 parts by mass per 100 parts of the total mass of the rosin (a) and the dispersant (b) having an anionic group, and the flat layered silicate mineral (c) 10 to 50 parts by mass is preferable for 100 parts by mass.
• the rosins (a) dispersants having anionic groups (b), and flat layered silicate minerals (c)
• aggregation and intense thickening are unlikely to occur, and stable moisture-proof performance is achieved. It is preferable for performance.
• the water-based coating agent of the present invention can be appropriately used together with a film-forming aid (e) in order to improve moisture-proof performance by improving the film-forming property of the rosin (a).
• the film-forming aid (e) has a solubility in water at 25° C. of 1 g/100 g or more, a boiling point at 1 atm of higher than 100° C., and a hydroxy group, an ether group or an ester group in one molecule.
• alcohols such as 1-butanol (boiling point: 117° C., solubility: 7 g/100 g), benzyl alcohol (boiling point: 205° C., solubility: 4
• Glycols diethylene glycol monoethyl ether (boiling point: 196 ° C., solubility: optional), dipropylene glycol monomethyl ether (boiling point: 190 ° C., solubility: optional), 3-methoxy-1-butanol (boiling point: 161 ° C., solubility: optional) and other glycol monoethers; diethylene glycol dimethyl ether (boiling point: 162 ° C., solubility: optional), diethylene glycol diethyl ether (boiling point: 188 ° C., solubility: optional), dipropylene glycol dimethyl ether (boiling point: 175 ° C., solubility: 53 g / 100 g) and other glycol diethers; , 4-diacetoxybutane (boiling point: 232 ° C., solubility: 4 g/100 g) and other glycol diesters; diethylene glyco
• glycol ether esters such as propylene glycol monomethyl ether propionate (boiling point: 161° C., solubility: 5 g/100 g); e
• the film-forming aid (e) is concentrated during drying and then evaporated, and the film-forming effect of the film-forming aid (e) is enhanced. Since it is easy to express, the moisture resistance of the coating film after drying is excellent.
• glycol diesters carboxylic acid esters, and glycerin esters are preferable, and from the viewpoint of practicality, Substances.
• At least one selected from triethyl citrate, 1,2-diacetoxypropane, or glyceryl triacetate that is certified as an indirect food additive as a Generally Recognized as Safe substance or as a component of paper and paperboard that comes in contact with food is more preferred.
• the film-forming aid (e) is in the range of 0 to 20 parts by mass with respect to 100 total parts by mass of the rosin (a) and the dispersant (b) having an anionic group. Higher moisture-proof performance can be exhibited, and it is more preferably within the range of 3 to 10 parts by weight.
• the moisture-proof coating agent includes, in addition to the above components (a) to (e), a viscosity modifier, an antifoaming agent, an antiseptic, a surface modifier, a dye, and a surface tension adjuster, as long as the effect is not impaired.
• a viscosity modifier such as agents, lubricants, antiblocking agents, antioxidants and UV absorbers, can be used.
• known waxes can be used as lubricants, antiblocking agents, and the like.
• the mass ratio of the rosin (a), the anionic group-containing dispersant (b), the flat layered silicate mineral (c), and the cationic resin (d) is preferably 10% or less.
• the wax is preferably biodegradable by microorganisms.
• plant waxes such as wax wax, Urushi wax, carnauba wax, rice bran wax, montan wax, or candelilla wax
• animal waxes such as beeswax, shellac wax, or lanolin
• mineral waxes such as montan wax or ozokerite
• paraffin wax Petroleum wax
• Petroleum wax such as microcrystalline wax, Fischer-Tropsch wax, fatty acid ester wax, or synthetic wax such as fatty acid amide
• plant waxes or animal waxes derived from organisms are preferred.
• the method for producing the moisture-proof coating agent of the present invention is not limited, and each component constituting the moisture-proof coating agent described above may be mixed together or sequentially mixed.
• a method of mixing an emulsified liquid obtained by emulsifying with a dispersant (b) having an anionic group and a dispersion liquid in which the flat layered silicate mineral (c) is uniformly dispersed in water can be used.
• the cationic resin (d) and optional film-forming aid (e) can be added at any stage, and an emulsion obtained by emulsifying rosins (a) with a dispersant (b) having an anionic group.
• a dispersion of a flat layered silicate mineral (c), or an emulsion obtained by emulsifying a rosin (a) with a dispersant (b) having an anionic group and a flat layered silicate mineral (c ) may be added after mixing.
• the flat layered silicate mineral (c) may undergo secondary agglomeration in the dispersion.
• a method of performing a mechanical forced dispersion treatment using a device such as a homomixer, jet mill, kneader, sand mill, ball mill, three rolls, or the like, which is subjected to shear stress, is preferably used.
• a representative application form of the water-based emulsion moisture-proof coating agent of the present invention is coating on paper.
• the paper used in this mode of use means paper and/or paperboard, and general paper or paperboard containing biodegradable pulp as a main component can be used without particular limitation. Specific examples include woodfree paper, pure white roll paper, unbleached or bleached kraft paper, glassine paper, coated paper, liner base paper, paper tube base paper, white board, chip board, and the like.
• the coating amount of the aqueous emulsion moisture-proof coating agent is preferably such that the solid content of the coating layer is 0.1 to 15 g/m 2 , more preferably 1 to 10 g/m 2 .
• a coating layer for liquid absorption control, a coating layer for smoothing the surface of the paper, etc. may be provided.
• Any known method for drying the wet coating film can be used without limitation. Examples thereof include cylinder heating, steam heating, hot air heating, infrared heating, and high frequency heating.
• the paper coated with the moisture-proof coating agent of the present invention is suitable as a packaging material for foods, medical products, electronic parts, etc. as it is, laminated with various resins, laminated with various films, aluminum foil, etc. can be used.
• Example of dissolution of hydroxylated lecithin 400 parts of 50% hydroxylated lecithin (trade name: NIKKOL Recinol SH50, manufactured by Nikko Chemicals Co., Ltd.) and 600 parts of water are added to a four-necked separable flask equipped with a heating device, a stirrer, a condenser, and a thermometer. Then, it was dissolved at room temperature for 20 minutes to obtain a hydroxylated lecithin solution with a concentration of 20% (hereinafter sometimes abbreviated as 20% lecithin solution).
• Emsification example 1 1000 parts of the M rosin obtained in Production Example 1 of acid-modified rosin was added to a four-necked separable flask equipped with a heating device, a stirrer, a condenser, and a thermometer, and the temperature was raised to 150° C. to melt. With vigorous stirring, 29 parts of a 70% bis(2-ethylhexyl) sodium sulfosuccinate aqueous solution, which is the dispersant (b) having an anionic group, was gradually added, followed by the dispersant (b) having an anionic group.
• Flat layered silicate mineral dispersion (c-1) was prepared in the same manner as for the flat layered silicate mineral dispersion (c-1), except that the type and charge amount of the flat layered silicate mineral (c) were changed as shown in Table 2, and the flat layered silicate was prepared. Salt mineral dispersions (c-2) to (c-4) were obtained.
• a cationic resin aqueous solution (d-2) containing an epichloro-modified polyamide polyamine resin with a concentration of 25%, a viscosity of 25 mPa s and a pH of 3.3. rice field.
• the resulting cationic resin aqueous solution (d-2) had a degree of cationization at pH 3 of 3.7 meq/g ⁇ solids and a weight average molecular weight of 25,000.
• a cationic resin aqueous solution (d-3) containing a urea-modified polyamidepolyamine resin with a concentration of 60%, a pH of 8.5 and a viscosity of 110 mPa ⁇ s.
• the resulting cationic resin aqueous solution (d-3) had a degree of cationization at pH 3 of 1.1 meq/g ⁇ solids and a weight average molecular weight of 1,500.
• Moisture-proof coating agents 2 to 25 were obtained in the same manner as moisture-proof coating agent 1 except that the types and amounts of the components were changed as shown in Table 3.
• the moisture-proof coating agent coating conditions and the measurement method or evaluation method for each evaluation item were in accordance with the following methods.
• (Coating base paper) Single gloss bleached kraft paper: Basis weight 50 g/m 2
• Each moisture-proof coating agent was applied to the non-glossy surface of the base paper using a bar coater (Bar No. 20) and dried at 100° C. for 30 seconds using a warm air dryer. After that, humidity conditioning was performed at 23° C. and 50% RH for 24 hours.
• moisture permeability It was measured according to JIS Z0208 moisture permeability test method for moisture-proof packaging materials (cup method). Temperature and humidity conditions: B method (40°C/90%RH/24 hours) Orientation of test piece: coated side outside
• Example 1 Moisture-proof coating agent 1 was applied to one-glazed bleached kraft paper under the above conditions and dried to obtain moisture-proof coating agent-coated paper in which the solid content of moisture-proof coating agent 1 was 8 g/m 2 . After humidity conditioning, a circle with a diameter of 70 mm was cut out, and the moisture permeability was calculated by the moisture permeable cup method. The results are shown in Table 4.
• Example 1 (Examples 17 and 18, Comparative Example 7) Example 1 except that the moisture-proof coating agent was changed as shown in Table 4, and the bar number of the bar coater at the time of coating was changed from 20 to 14 to set the solid content coating amount of the moisture-proof coating agent to 12 g / m 2 .
• a moisture-proof coating agent-coated paper was obtained in the same manner as above. Furthermore, the moisture permeability was evaluated in the same manner as in Example 1. These results are shown in Table 4.
• Comparative Examples 1 and 3 Compared to Examples 1 and 6, Comparative Examples 1 and 3, in which the flat layered silicate mineral (c) and cationic resin (d) were not used, are inferior in moisture resistance of the paper.

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Paper (AREA)
• Paints Or Removers (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=86241298

Family Applications (1)

Country Status (2)

Citations (5)

• 2022
  • 2022-09-22 WO PCT/JP2022/035313 patent/WO2023079854A1/ja not_active Ceased
  • 2022-09-22 JP JP2023512082A patent/JP7284928B1/ja active Active

Patent Citations (5)

Also Published As

Similar Documents

Legal Events