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
  • C09D11/00—Inks
  • C09D11/02—Printing inks
  • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
  • C09D11/033—Printing inks characterised by features other than the chemical nature of the binder characterised by the solvent
• • 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
  • C09D11/00—Inks
  • C09D11/02—Printing inks
  • C09D11/10—Printing inks based on artificial resins
  • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds

Definitions

• This disclosure relates to a resin composition for modifying ink, a modifier for gravure ink, and gravure ink.
• EVA ethylene-vinyl ester copolymers
• VA vinyl acetate
• PA ethylene-vinyl ester copolymers
• PA ethylene-vinyl ester copolymers
• PA ethylene-vinyl ester copolymers
• organic solvents for gravure inks but toluene is particularly inexpensive, has suitable drying properties during printing, and has high solubility for resins, additives, etc.
• the purpose of this disclosure is to provide an ink modifying resin composition and gravure ink that have excellent flowability when dissolved in an ester-based solvent.
• the content of the constituent units derived from vinyl acetate contained in the ethylene-vinyl acetate copolymer is 28% by mass to 48% by mass relative to the total mass of the ethylene-vinyl acetate copolymer.
• the melt mass flow rate of the ethylene-vinyl ester copolymer A measured in accordance with JIS K7210:1999 at 190 ° C. and a load of 2160 g is 0.1 g / 10 min to 800 g / 10 min.
• the ink modifying resin composition according to any one of ⁇ 1> to ⁇ 3>.
• ⁇ 5> The melt mass flow rate of the acrylic block copolymer B measured in accordance with JIS K7210:1999 at 190 ° C. and a load of 2160 g is 0.01 g / 10 min to 100 g / 10 min.
• ⁇ 6> The hardness of the acrylic block copolymer B measured in accordance with ISO 7619-1 (Type A) is 5 to 150.
• the acrylic block copolymer B is a copolymer 1 including a block chain consisting of a structural unit derived from methyl methacrylate and a block chain consisting of a structural unit derived from n-butyl acrylate, and a block chain consisting of a structural unit derived from methyl methacrylate, a block chain consisting of a structural unit derived from n-butyl acrylate, and a block chain consisting of a structural unit derived from 2-ethylhexyl acrylate.
• the ink modifying resin composition according to any one of ⁇ 1> to ⁇ 6>, which includes at least one selected from the group consisting of copolymer 2.
• ⁇ 8> The resin composition for modifying ink according to any one of ⁇ 1> to ⁇ 7>, wherein the acrylic block copolymer B has not been subjected to an anti-blocking treatment.
• ⁇ 9> The resin composition for modifying ink according to any one of ⁇ 1> to ⁇ 8>, wherein the solubility parameter of the acrylic block copolymer B is 8.5 or more.
• the melt mass flow rate of the ink modifying resin composition measured in accordance with JIS K7210:1999 at 190 ° C. and a load of 2160 g is 0.1 g / 10 min to 800 g / 10 min.
• the content of the constituent units derived from vinyl acetate contained in the ink modifying resin composition is 10% by mass to 48% by mass.
• a gravure ink modifier comprising the resin composition for modifying ink according to any one of ⁇ 1> to ⁇ 13>.
• ⁇ 15> A gravure ink comprising the resin composition for modifying ink according to any one of ⁇ 1> to ⁇ 13>.
• This disclosure makes it possible to provide an ink modifying resin composition and gravure ink that have excellent flowability when dissolved in an ester-based solvent.
• a numerical range indicated using “to” indicates a range that includes the numerical values before and after “to” as the minimum and maximum values, respectively.
• the amount of each component means the total amount of the multiple substances, unless otherwise specified.
• the upper or lower limit value described in a certain numerical range may be replaced by the upper or lower limit value of another numerical range described in stages, or may be replaced by a value shown in the examples.
• the resin composition for modifying ink includes an ethylene-vinyl ester copolymer A and an acrylic block copolymer B, and the total content of the ethylene-vinyl ester copolymer A and the acrylic block copolymer B is more than 70 mass% and not more than 100 mass% based on the total mass of the resin composition for modifying ink.
• An ink modifying resin composition containing ethylene-vinyl ester copolymer A and acrylic block copolymer B has superior fluidity when dissolved in an ester solvent compared to when ethylene-vinyl ester copolymer A is used alone.
• ethylene-vinyl ester copolymer A particularly ethylene-vinyl acetate copolymer
• ester-based solvents there is a method for increasing the content of structural units derived from vinyl esters (particularly vinyl acetate) in ethylene-vinyl ester copolymer A.
• the content of structural units derived from vinyl esters (particularly vinyl acetate) is increased, the tackiness of ethylene-vinyl ester copolymer A (particularly ethylene-vinyl acetate copolymer) also increases, which causes a problem that blocking is easily caused.
• the ink modifying resin composition disclosed herein uses an acrylic block copolymer B, so that solubility in ester-based solvents can be suitably ensured even when the content of constituent units derived from vinyl esters (particularly vinyl acetate) is reduced. Therefore, the ink modifying resin composition disclosed herein can easily achieve both solubility in ester-based solvents and inhibition of blocking. Furthermore, the amount of inorganic fillers, anti-blocking agents such as fine particle polymers, and the like used to inhibit blocking can be reduced, so that when the ink modifying resin composition is dissolved in an ester-based solvent, the decrease in transparency of the ink modifying resin composition can be suppressed.
• the total content of the ethylene-vinyl ester copolymer A and the acrylic block copolymer B is more than 70% by mass and not more than 100% by mass, preferably 80% by mass to 100% by mass, and more preferably 90% by mass to 100% by mass, based on the total mass of the ink modifying resin composition.
• the resin composition for modifying ink of the present disclosure contains ethylene-vinyl ester copolymer A.
• the ethylene-vinyl ester copolymer A is a polymer obtained by copolymerizing ethylene and a vinyl ester, and is not particularly limited as long as it is a polymer containing a structural unit derived from ethylene and a structural unit derived from a vinyl ester.
• the ethylene-vinyl ester copolymer A may be a random copolymer, a block copolymer, or an alternating copolymer.
• Examples of the ethylene-vinyl ester copolymer A include ethylene-vinyl acetate copolymer, ethylene-vinyl propionate copolymer, ethylene-vinyl butyrate copolymer, and ethylene-vinyl stearate copolymer.
• the ethylene-vinyl ester copolymer A may be used alone or in combination of two or more kinds.
• the content of structural units derived from ethylene is preferably 30% by mass to 95% by mass, more preferably 40% by mass to 94% by mass, more preferably 46% by mass to 84% by mass, more preferably 48% by mass to 80% by mass, more preferably 52% by mass to 72% by mass, more preferably 54% by mass to 68% by mass, and more preferably 56% by mass to 60% by mass, based on the total mass of ethylene-vinyl ester copolymer A.
• the content of the constituent units derived from vinyl ester (preferably the content of the constituent units derived from vinyl acetate) is preferably 5% by mass to 70% by mass, more preferably 6% by mass to 60% by mass, more preferably 14% by mass to 54% by mass, more preferably 20% by mass to 52% by mass, more preferably 28% by mass to 48% by mass, more preferably 32% by mass to 46% by mass, and more preferably 40% by mass to 44% by mass, based on the total mass of ethylene-vinyl ester copolymer A, from the viewpoint of solubility in an ester solvent.
• Ethylene-vinyl ester copolymer A may be a copolymer consisting only of structural units derived from ethylene and structural units derived from vinyl ester, or may further contain structural units derived from monomers other than ethylene and vinyl ester.
• ethylene and vinyl esters include, for example, unsaturated hydrocarbons such as propylene, butene, 1,3-butadiene, pentene, 1,3-pentadiene, and 1-hexene, oxides such as vinyl sulfate and vinyl nitrate, halogen compounds such as vinyl chloride and vinyl fluoride, primary and secondary amine compounds containing vinyl groups, carbon monoxide, and sulfur dioxide.
• unsaturated hydrocarbons such as propylene, butene, 1,3-butadiene, pentene, 1,3-pentadiene, and 1-hexene
• oxides such as vinyl sulfate and vinyl nitrate
• halogen compounds such as vinyl chloride and vinyl fluoride
• primary and secondary amine compounds containing vinyl groups carbon monoxide, and sulfur dioxide.
• the content of structural units derived from monomers other than ethylene and vinyl ester that may be contained in the ethylene-vinyl ester copolymer A may be 0% by mass to 10% by mass, or 0% by mass to 5% by mass, relative to the total mass of the ethylene-vinyl ester copolymer A.
• the method for producing ethylene-vinyl ester copolymer A is not particularly limited, and it can be produced by a known method. For example, it can be obtained by radical copolymerization of each polymerization component under high temperature and pressure. It can be produced by either the autoclave method or the tubular method. In addition, commercially available ethylene-vinyl ester copolymer A may be used.
• the melt mass flow rate (MFR) of the ethylene-vinyl ester copolymer A measured in accordance with JIS K7210:1999 at 190°C under a load of 2160 g is preferably 0.1 g/10 min to 800 g/10 min, more preferably 1 g/10 min to 300 g/10 min, more preferably 10 g/10 min to 200 g/10 min, more preferably 30 g/10 min to 150 g/10 min, more preferably 50 g/10 min to 100 g/10 min, and even more preferably 70 g/10 min to 90 g/10 min.
• the content of ethylene-vinyl ester copolymer A in the ink modifying resin composition is preferably 10% by mass to 90% by mass, more preferably 15% by mass to 85% by mass, and even more preferably 20% by mass to 80% by mass, based on the total mass of the resin components in the ink modifying resin composition.
• Ethylene-vinyl ester copolymer A preferably contains an ethylene-vinyl acetate copolymer.
• the content of the ethylene-vinyl acetate copolymer may be 50% by mass to 100% by mass, 70% by mass to 100% by mass, or 90% by mass to 100% by mass, based on the total mass of ethylene-vinyl ester copolymer A.
• the resin composition for modifying ink according to the present disclosure contains an acrylic block copolymer B.
• the acrylic block copolymer B is a block copolymer having a polymer block which is a soft segment and a polymer block which is a hard segment.
• the acrylic block copolymer B may be used alone or in combination of two or more kinds.
• Acrylic block copolymer B contains an acrylic monomer (a monomer having an acryloyl group or a methacryloyl group) as a monomer component constituting at least one of the polymer blocks of the soft segment and the hard segment.
• the acrylic monomer constituting the soft segment is preferably an acrylic acid ester. That is, the polymer block of the soft segment is preferably an acrylic acid ester polymer block (b1).
• the acrylic acid ester include acrylic acid esters having a hydrocarbon group that may have an alkoxy group (particularly, an acrylic acid alkyl ester that may have an alkoxy group), such as methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, sec-butyl acrylate, tert-butyl acrylate, n-pentyl acrylate, isopentyl acrylate, n-hexyl acrylate, cyclohexyl acrylate, 2-ethylhexyl acrylate, pentadecyl acrylate, dodecyl acrylate, isobornyl acrylate, phenyl acrylate, benzyl acrylate, phenoxyethyl acryl
• the hydrocarbon group in the acrylic acid ester may be any of an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group in which two or more of these are bonded.
• the acrylic monomers may be used alone or in combination of two or more.
• an acrylic ester having a hydrocarbon group with 1 to 22 carbon atoms (preferably 1 to 10, more preferably 1 to 4 carbon atoms) is preferred.
• the hydrocarbon group in the acrylic ester is preferably an aliphatic hydrocarbon. Therefore, as the acrylic ester, in particular, an alkyl acrylate is preferred, n-butyl acrylate and 2-ethylhexyl acrylate are more preferred, and n-butyl acrylate is even more preferred.
• the acrylic monomer constituting the acrylic ester polymer block (b1) may contain other acrylic monomers other than the acrylic ester having a hydrocarbon group which may have an alkoxy group.
• the other acrylic monomers include acrylic esters having a crosslinkable functional group such as 2-hydroxyethyl acrylate, glycidyl acrylate, and allyl acrylate; methacrylic esters constituting hard segments; and carboxyl group-containing monomers such as methacrylic acid and acrylic acid.
• the monomer components constituting the soft segments may further contain other monomers such as aromatic vinyl compounds; vinyl cyanide monomers such as acrylonitrile and methacrylonitrile; and olefins.
• the proportion of the acrylic ester having a hydrocarbon group which may have an alkoxy group in the acrylic ester polymer block (b1) is preferably 90% by mass or more, more preferably 95% by mass or more, based on the total mass of the monomer components constituting the acrylic ester polymer block (b1). There is no particular limit to the upper limit of the above proportion, as long as it is 100% by mass or less.
• the glass transition temperature of the acrylic acid ester polymer block (b1) is not particularly limited, but is preferably -100°C to 20°C, more preferably -80°C to 0°C, and even more preferably -60°C to -40°C.
• the acrylic monomer constituting the hard segment is preferably a methacrylic acid ester.
• the polymer block that is the hard segment is preferably a methacrylic acid ester polymer block (b2).
• the methacrylic acid ester include methacrylic acid esters having a hydrocarbon group that may have an alkoxy group (particularly methacrylic acid alkyl esters that may have an alkoxy group), such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, n-pentyl methacrylate, isopentyl methacrylate, n-hexyl methacrylate, cyclohexyl methacrylate, 2-ethylhexyl methacrylate, pentadecy
• the hydrocarbon group in the methacrylic acid ester may be any of an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, an aromatic hydrocarbon group, and a group in which two or more of these are bonded.
• the acrylic monomers may be used alone or in combination of two or more.
• a methacrylic acid ester having a hydrocarbon group with 1 to 22 carbon atoms preferably 1 to 10, more preferably 1 to 4
• the hydrocarbon group in the methacrylic acid ester is preferably an aliphatic hydrocarbon.
• an alkyl methacrylate is preferable, and methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, tert-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and isobornyl methacrylate are more preferable, and methyl methacrylate is particularly preferable.
• the acrylic monomer constituting the methacrylic acid ester polymer block (b2) may contain other acrylic monomers other than the methacrylic acid ester having a hydrocarbon group which may have an alkoxy group.
• the other acrylic monomers include methacrylic acid esters having a crosslinkable functional group such as 2-hydroxyethyl methacrylate, glycidyl methacrylate, and allyl methacrylate; acrylic acid esters constituting soft segments; and carboxyl group-containing monomers such as methacrylic acid and acrylic acid.
• the monomer components constituting the methacrylic acid ester polymer block (b2) may further contain other monomers such as aromatic vinyl compounds; vinyl cyanide monomers such as acrylonitrile and methacrylonitrile; and olefins.
• the proportion of the methacrylic acid ester having a hydrocarbon group which may have an alkoxy group in the methacrylic acid ester polymer block (b2) is preferably 90% by mass or more, more preferably 95% by mass or more, based on the total mass of the monomer components constituting the methacrylic acid ester polymer block (b2). There is no particular limitation on the upper limit of the above proportion, as long as it is 100% by mass or less.
• Acrylic block copolymer B preferably contains at least one selected from the group consisting of copolymer 1 containing a block chain made of structural units derived from methyl methacrylate and a block chain made of structural units derived from n-butyl acrylate, and copolymer 2 containing a block chain made of structural units derived from methyl methacrylate, a block chain made of structural units derived from n-butyl acrylate, and a block chain made of structural units derived from 2-ethylhexyl acrylate, and more preferably contains copolymer 1 containing a block chain made of structural units derived from methyl methacrylate and a block chain made of structural units derived from n-butyl acrylate.
• the glass transition temperature of the methacrylic acid ester polymer block (b2) is not particularly limited, but is preferably 30°C to 180°C, more preferably 60°C to 160°C, and even more preferably 100°C to 120°C.
• the acrylic block copolymer B may have other polymer blocks (b3) other than the acrylic acid ester polymer block (b1) and the methacrylic acid ester polymer block (b2).
• the other polymer blocks are composed of monomer components other than acrylic acid esters and methacrylic acid esters.
• Examples of monomers constituting the other polymer blocks include ⁇ -olefins such as ethylene, propylene, 1-butene, isobutylene, and 1-octene; conjugated dienes such as butadiene, isoprene, and myrcene; aromatic vinyl monomers such as styrene, ⁇ -methylstyrene, p-methylstyrene, and m-methylstyrene; vinyl acetate, vinylpyridine, acrylonitrile, methacrylonitrile, vinyl ketone, vinyl chloride, vinylidene chloride, vinylidene fluoride, acrylamide, methacrylamide, ⁇ -caprolactone, and valerolactone.
• ⁇ -olefins such as ethylene, propylene, 1-butene, isobutylene, and 1-octene
• conjugated dienes such as butadiene, isoprene, and myrcene
• aromatic vinyl monomers such as
• each polymer block constituting the acrylic block copolymer B is not particularly limited, and may be linear, branched, radial, etc.
• Examples of the bond form include linear structures such as ⁇ (b1)-(b2) ⁇ n structure, ⁇ (b1)-(b2) ⁇ n-(b1) structure, (b2)- ⁇ (b1)-(b2) ⁇ n structure, (b2)- ⁇ (b1)-(b2) ⁇ n-(b3) structure, (b3)-(b2)- ⁇ (b1)-(b2) ⁇ n-(b3) structure, and ⁇ (b1)-(b2) ⁇ nZ structure (n is a natural number, Z represents a coupling agent residue).
• a linear structure is preferred, and it is more preferred to use a triblock copolymer in which the methacrylic acid ester polymer block (b2) is bonded to both ends of the acrylic acid ester polymer block (b1).
• the weight average molecular weight of the acrylic block copolymer B is preferably 10,000 to 200,000, more preferably 15,000 to 150,000.
• the weight average molecular weight of the acrylic block copolymer B is 10,000 or more, the melt viscosity is appropriate and the melt-kneadability with the ethylene-vinyl ester copolymer A is good.
• the weight average molecular weight is 200,000 or less, an increase in melt viscosity can be suppressed.
• the weight average molecular weight of each of the acrylic acid ester polymer block (b1) and the methacrylic acid polymer block (b2) in the acrylic block copolymer B is preferably 2,000 to 100,000, more preferably 5,000 to 80,000.
• the total content of the acrylic acid ester polymer block (b1) in the acrylic block copolymer B is preferably 35% by mass to 95% by mass, more preferably 40% by mass to 95% by mass, and even more preferably 45% by mass to 90% by mass, based on the total mass of the acrylic block copolymer B.
• the content is 35% by mass or more, the flowability is improved.
• the content is 95% by mass or less, the ink modifying resin composition is less likely to stick.
• the total content of the methacrylic acid ester polymer block (b2) in the acrylic block copolymer B is preferably 5% by mass to 65% by mass, more preferably 5% by mass to 60% by mass, and even more preferably 10% by mass to 55% by mass, based on the total mass of the acrylic block copolymer B.
• the total content of the acrylic acid ester polymer block (b1) and the methacrylic acid ester polymer block (b2) in the acrylic block copolymer B is preferably 60% by mass or more, more preferably 80% by mass or more, even more preferably 90% by mass or more, and particularly preferably 95% by mass or more, based on the total mass of the acrylic block copolymer B. There is no particular upper limit to the aforementioned percentage, so long as it is 100% by mass or less.
• the molecular weight distribution (weight average molecular weight (Mw)/number average molecular weight (Mn)) of the acrylic block copolymer B is preferably 1.01 or more and less than 1.50, more preferably 1.01 to 1.35, and even more preferably 1.01 to 1.20.
• the hardness of the acrylic block copolymer B measured in accordance with ISO 7619-1 (Type A) is preferably 5 to 150, more preferably 10 to 120, and even more preferably 60 to 100.
• the melt mass flow rate (MFR) of the acrylic block copolymer B measured in accordance with JIS K7210:1999 at 190°C under a load of 2160 g is preferably 0.01 g/10 min to 100 g/10 min, more preferably 0.1 g/10 min to 60 g/10 min, even more preferably 1 g/10 min to 50 g/10 min, and even more preferably 1 g/10 min to 30 g/10 min.
• the content of acrylic block copolymer B in the ink modifying resin composition is preferably 10% by mass to 90% by mass, more preferably 15% by mass to 85% by mass, and even more preferably 20% by mass to 80% by mass, based on the total mass of the resin components in the ink modifying resin composition.
• Acrylic block copolymer B may have functional groups such as hydroxyl groups, carboxyl groups, acid anhydrides, and amino groups in the molecular chain or at the ends of the molecular chain, as necessary.
• the acrylic block copolymer B may or may not be subjected to an anti-blocking treatment. From the viewpoint of the transparency of the ink modifying resin composition when the ink modifying resin composition is dissolved in an ester solvent, it is preferable that the acrylic block copolymer B is not subjected to an anti-blocking treatment.
• the solubility parameter of the acrylic block copolymer B is preferably 8.5 or more, and more preferably 9.0 or more. There is no particular upper limit to the solubility parameter of the acrylic block copolymer B, and it may be, for example, 15.0 or less, or 12.0 or less.
• a commercially available product may be used as the acrylic block copolymer B.
• Commercially available products of the acrylic block copolymer B include Kuraray Co., Ltd.'s Clarity LA2140, LA2330, LA3320, LA2250, LA2270, LA4285, and LA1892.
• One of these commercially available products may be used alone, or two or more of them may be used in combination.
• the shape of the resin composition for modifying ink of the present disclosure is not particularly limited. From the viewpoints of ease of removal from a storage location, ease of supply to a molding device, etc., ease of transportation, ease of measurement, etc., it is preferable that the resin composition for modifying ink is in the form of pellets.
• the melt mass flow rate of the ink modifying resin composition measured in accordance with JIS K7210:1999 at 190°C under a load of 2160 g is preferably 0.1 g/10 min to 800 g/10 min, more preferably 0.5 g/10 min to 300 g/10 min, even more preferably 1 g/10 min to 100 g/10 min, and even more preferably 2 g/10 min to 80 g/10 min.
• the content of vinyl acetate-derived structural units contained in the ink modifying resin composition of the present disclosure may be 10% by mass to 48% by mass, or 10% by mass to 40% by mass.
• the ink modifying resin composition of the present disclosure when a mixture prepared by adding 20 parts by mass of the ink modifying resin composition to 80 parts by mass of a 1:1 (mass ratio) mixed solution of normal propyl acetate and ethyl acetate is shaken under conditions of 30° C. and 85 rpm, it is preferable that the time until the ink modifying resin composition is completely dissolved in the mixed solution (complete dissolution time) is less than 12 hours.
• the above-mentioned complete dissolution time may be less than 10 hours or less than 6 hours.
• ink modifying resin composition of the present disclosure a mixture prepared by adding 20 parts by mass of the ink modifying resin composition to 80 parts by mass of a 1:1 (mass ratio) mixed solution of normal propyl acetate and ethyl acetate is shaken at 30 ° C. and 85 rpm until the ink modifying resin composition is completely dissolved in the mixed solution, and then allowed to stand at 23 ° C. for 24 hours.
• the solution viscosity measured using a B-type viscometer shown below is preferably less than 8500 mPa s, more preferably 8000 mPa s or less, more preferably 4000 mPa s or less, more preferably less than 2000 mPa s, more preferably 1500 mPa s or less, even more preferably 1200 mPa s or less, and particularly preferably 1000 mPa s or less.
• the lower limit of the solution viscosity is not particularly limited, and may be, for example, 1 mPa ⁇ s or more, 5 mPa ⁇ s or more, 10 mPa ⁇ s or more, or 30 mPa ⁇ s or more.
• the ink modifying resin composition of the present disclosure may contain other components as necessary, such as liquid coating agents, powder coating agents such as inorganic fillers, pigments, dyes, antioxidants, lubricants, weather resistance agents, antiblocking agents other than the above-mentioned powder coating agents, heat stabilizers, UV stabilizers, flame retardants, flame retardant assistants, etc.
• powder coating agents such as inorganic fillers, pigments, dyes, antioxidants, lubricants, weather resistance agents, antiblocking agents other than the above-mentioned powder coating agents, heat stabilizers, UV stabilizers, flame retardants, flame retardant assistants, etc.
• the application of the ink modifying resin composition of the present disclosure is not particularly limited, and it is used, for example, as a gravure ink modifier.
• the gravure ink modifier is not particularly limited as long as it is prepared using the ink modifying resin composition described above.
• the gravure ink modifier may include, for example, an ink modifying resin composition that includes an ethylene-vinyl ester copolymer A, an acrylic block copolymer B, and other components as necessary.
• the gravure ink of the present disclosure includes the above-mentioned resin composition for modifying ink of the present disclosure.
• the gravure ink may include components contained in general gravure ink other than the above-mentioned resin composition for modifying ink of the present disclosure, for example, resin components other than the resin composition for modifying ink, solvents, colorants, other components, etc.
• the solvent examples include aliphatic cyclic hydrocarbon solvents, ketone-based solvents, ester-based solvents, alcohol-based solvents, and glycol ether-based solvents.
• a single type of solvent may be used alone, or two or more types may be used in combination.
• the solvent preferably includes an ester-based solvent, and examples of the ester-based solvent include methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, and butyl acetate.
• Colorants include pigments, dyes, etc.
• antioxidants include antioxidants, lubricants, weather resistance agents, antiblocking agents, heat stabilizers, UV stabilizers, flame retardants, flame retardant assistants, dispersants, antistatic agents, plasticizers, olefin wax, surfactants, etc.
• Examples 1 to 7 and Comparative Example 1 ⁇ Preparation of ink modifying resin composition P>
• the materials were mixed in advance in the proportions shown in Table 1, fed into a twin-screw extruder with a screw diameter of 30 mm, melt-kneaded, and granulated to prepare pellets of the ink modifying resin composition P.
• the blanks in Table 1 indicate that the materials were not mixed.
• the content of constituent units derived from vinyl acetate in the ink modifying resin composition P prepared above was calculated from the content of constituent units derived from vinyl acetate in the ethylene-vinyl ester copolymer A used as a raw material, and the content of ethylene-vinyl ester copolymer A when the entire ink modifying resin composition P was taken as 100 mass%.
• the MFR of the ink modifying resin composition P prepared above was measured at 190° C. under a load of 2160 g in accordance with JIS K 7210:1999. The results obtained are shown in Table 1.
• the ink modifying resin compositions P of Examples 1 to 3 were all excellent in transparency, hue, the presence or absence of suspended matter, the presence or absence of precipitate, and flowability.
• the ink modifying resin compositions P of Examples 4 to 7 were good in hue, presence or absence of suspended matter, presence or absence of sediment, and flowability, but were translucent.
• Comparative Example 1 the transparency, hue, the presence or absence of suspended matter, and the presence or absence of sediment were good, but the fluidity was poor.

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