Composition containing modified cellulose fibers having modifying groups

Abstract

To provide a composition that maintains viscosity with a minimum amount of thickening agent. [Solution] A composition comprising the following components (A), (B), and (C): Component (A): Modified cellulose fiber having a modifying group; Component (B): An organic acid or its salt having an acid dissociation constant pKa of -5 or more and 6 or less in aqueous solution; Component (C): A non-aqueous liquid that is liquid at 25°C and 1 atm and has a dielectric constant of 30 or less at 25°C.

Description

[Technical Field]

[0001] The present invention relates to a composition containing modified cellulose fibers having a modifying group. [Background technology]

[0002] In recent years, electronic devices that handle high-speed, high-capacity information, such as digital home appliances, have become smaller, lighter, and thinner, leading to a growing demand for miniaturization and weight reduction in electronic devices. In such electronic material applications, non-aqueous solvents are used for bonding and coating components such as conductive and insulating pastes, from the viewpoint of coating properties and printability. These components are bonded and coated through high-temperature treatment, which involves the coalescence and sintering of inorganic particles or the hardening of binders. These components generally contain thickeners to improve the printability of confined wiring. Increasing the amount of thickener can increase the viscosity of the composition, but as the amount of thickener increases, the relative amount of solids other than the thickener in the composition decreases, which tends to degrade the composition's properties other than viscosity.

[0003] Modified cellulose fiber dispersions are expected to be used as thickeners that contribute to maintaining viscosity at high temperatures due to their high heat resistance. For example, Patent Document 1 describes an invention of a non-aqueous solvent thickener composition suitable for use at temperatures above 50°C, in which viscosity reduction is suppressed even at high temperatures. The modified cellulose fiber used in Patent Document 1 is one or more selected from the group consisting of (1) and (2) below: (1) A cellulose fiber having a type I crystalline structure, wherein a modifying group is bonded to the cellulose fiber, and the modifying group contains one or more selected from the group consisting of (a) a hydrocarbon group, (b) a silicone chain, and (c) an alkylene oxide chain; (2) An acid-type anionic modified cellulose fiber having a type I crystalline structure. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-001634 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Therefore, the present invention sought a composition that could achieve fine and precise printing of paste materials while maintaining viscosity with a minimum amount of thickening agent. [Means for solving the problem]

[0006] In other words, the present invention relates to the following [1] to

[14] . [1] A composition comprising the following components (A), (B), and (C). Component (A): Modified cellulose fiber having a modifying group Component (B): Organic acid or salt thereof having an acid dissociation constant pKa of -5 to 6 in aqueous solution. Component (C): A non-aqueous liquid that is liquid at 25°C and 1 atm, with a relative permittivity of 30 or less at 25°C. [2] The composition according to [1], wherein the modified cellulose fibers having a modifying group have the modifying group via ionic and / or covalent bonds. [3] The composition according to [1] or [2] above, wherein the amount of component (A) blended with 100 parts by mass of component (C) is 0.1 parts by mass or more and 100 parts by mass or less. [4] The composition according to any one of the above items [1] to [3], wherein the content of the glucose portion of component (A) per 100 parts by mass of component (C) is 0.01 parts by mass or more and 100 parts by mass or less. [5] The composition according to any one of the above items [1] to [4], wherein the amount of component (B) blended per 100 parts by mass of component (C) is 1 part by mass or more and 100 parts by mass or less. [6] The composition according to any one of the above items [1] to [5], wherein the amount of component (A) in the composition is 0.1% by mass or more and 20% by mass or less. [7] The composition according to any one of the above items [1] to [6], wherein the content of the glucose portion of component (A) in the composition is 0.01% by mass or more and 10% by mass or less. [8] The composition according to any one of the above items [1] to [7], wherein component (B) is an organic sulfonic acid or a salt thereof. [9] The composition according to any one of the above items [1] to [8], further comprising the following component (D). Component (D): Metal particles

[10] The composition according to [9], wherein the amount of component (D) in the composition is 50% by mass or more and 97% by mass or less.

[11] An ink comprising the following components (A), (B), (C), and (D). Component (A): Modified cellulose fiber having a modifying group Component (B): Compound with a melting point of 80°C or higher Component (C): Non-aqueous liquid that is liquid at 25°C and 1 atm. Component (D): Metal particles

[12] The ink according to

[11] , wherein the amount of component (D) in the ink is 50% by mass or more and 97% by mass or less.

[13] A conductive paste comprising the following components (A), (B), (C), and (D). Component (A): Modified cellulose fiber having a modifying group Component (B): Compound with a melting point of 80°C or higher Component (C): Non-aqueous liquid that is liquid at 25°C and 1 atm. Component (D): Metal particles

[14] The conductive paste according to

[13] , wherein the amount of component (D) in the conductive paste is 50% by mass or more and 97% by mass or less. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a composition that can maintain its thickening properties even with a minimal amount of thickening agent. By using this composition instead of conventional thickening agents, an improved printability effect can be expected, enabling fine and precise printing of paste materials in electronic devices.

Mode for Carrying Out the Invention

[0008] <Composition> [Composition] The composition of the present invention is obtained by blending the following components (A), component (B), and component (C). Component (A): Modified cellulose fiber having a modifying group Component (B): Organic acid having an acid dissociation constant pKa of -5 or more and 6 or less in an aqueous solution or a salt thereof Component (C): Non-aqueous liquid that is liquid at 25°C and 1 atm and has a relative permittivity of 30 or less at 25°C

[0009] As a result of investigations by the present inventors, it is presumed that when a modified cellulose fiber having a modifying group and a specific organic acid or a salt thereof coexist in component (C), the modifying group and the organic acid interact with each other to cause a thickening effect.

[0010] [Viscosity of Composition] The composition of the present invention preferably has a certain viscosity when used as a conductive paste. For example, the viscosity value at 30°C is preferably 1 Pa·s or more, more preferably 5 Pa·s or more, and still more preferably 10 Pa·s or more. On the other hand, from the viewpoint of production, it is preferably 1500 Pa·s or less, more preferably 1300 Pa·s or less, and still more preferably 1100 Pa·s or less. The viscosity of the composition of the present invention at 30°C is measured by the method described in the examples below.

[0011] [Component (A)] As the modified cellulose fiber having a modifying group of component (A), a modified cellulose fiber in which a modifying group is bonded to an anionic group of an anionic modified cellulose fiber is preferable. Modified cellulose fibers and anionic modified cellulose fibers having a modifying group have a cellulose I-type crystal structure due to the use of natural cellulose fibers as raw materials.

[0012] Cellulose type I refers to the crystalline form of natural cellulose, and the degree of crystallinity of cellulose type I refers to the proportion of crystalline material within the total cellulose.

[0013] In the present invention, the degree of crystallinity of modified cellulose fibers and anionically modified cellulose fibers having modifying groups is preferably 10% or more, more preferably 15% or more, and even more preferably 20% or more, from the viewpoint of increasing the thickness of the composition. Furthermore, from the viewpoint of raw material availability, it is preferably 90% or less, more preferably 85% or less, even more preferably 80% or less, and even more preferably 75% or less. In this specification, the degree of crystallinity of various cellulose fibers is the degree of cellulose type I crystallinity calculated from the diffraction intensity value by X-ray diffraction, and can be measured, for example, according to the method described in Japanese Patent Application Publication No. 2024-067274. Cellulose type I refers to the crystalline form of natural cellulose, and the degree of cellulose type I crystallinity means the proportion of the crystalline region in the total amount of cellulose fibers. The presence or absence of a cellulose type I crystalline structure can be determined by the presence of a peak at 2θ = 22.6° in X-ray diffraction measurement.

[0014] The average fiber diameter of anionically modified cellulose fibers is preferably 0.1 μm or more, more preferably 1 μm or more, even more preferably 10 μm or more, and even more preferably 30 μm or more, from the viewpoint of thickening non-aqueous liquids with modified cellulose fibers having modifying groups. Also, from the same viewpoint, it is preferably 100 μm or less, more preferably 70 μm or less, and even more preferably 50 μm or less. The average fiber diameter of various cellulose fibers, such as anionically modified cellulose fibers, can be measured by the method described in the examples.

[0015] The average fiber length of anionically modified cellulose fibers is preferably 1 μm or more, more preferably 10 μm or more, and even more preferably 100 μm or more, from the viewpoint of increasing the viscosity of the composition. From a similar viewpoint, it is preferably 10,000 μm or less, more preferably 5,000 μm or less, even more preferably 1,000 μm or less, and even more preferably 500 μm or less. The average fiber length of various cellulose fibers, such as anionically modified cellulose fibers, can be measured by the method described in the examples.

[0016] The average aspect ratio of anionically modified cellulose fibers, i.e., the fiber length / fiber diameter ratio, is preferably 1 or higher, more preferably 2 or higher, and even more preferably 3 or higher, from the viewpoint of increasing the viscosity of the composition. Similarly, it is preferably 250 or lower, more preferably 200 or lower, even more preferably 100 or lower, even more preferably 50 or lower, and even more preferably 30 or lower. The average aspect ratio of various cellulose fibers, such as anionically modified cellulose fibers, can be calculated from the average fiber diameter and average fiber length.

[0017] From the viewpoint of stable introduction of modifying groups, anionic modified cellulose fibers preferably have an anionic group content of 0.1 mmol / g or more, more preferably 0.4 mmol / g or more, and even more preferably 1.0 mmol / g or more. The upper limit is preferably 3.0 mmol / g or less, more preferably 2.0 mmol / g or less, and even more preferably 1.8 mmol / g or less. The anionic group content in anionic modified cellulose fibers can be measured by the method described in the examples.

[0018] Examples of anionic groups include carboxyl groups, sulfate groups, and phosphate groups, while examples of cationic groups include groups containing onium, such as ammonium, phosphonium, and sulfonium. From the viewpoint of efficient introduction into cellulose fibers, anionic groups are preferred as ionic groups, and carboxyl groups are more preferred as anionic groups. Furthermore, the ion paired with the anionic group (counterion) is preferably a proton.

[0019] The preferred ranges for the average fiber diameter, average fiber length, average aspect ratio, and degree of crystallinity of modified cellulose fibers having modifying groups are the same as those for anionically modified cellulose fibers.

[0020] From the viewpoint of increasing the viscosity of the composition, the amount of modifying groups attached to the modified cellulose fibers is preferably 0.01 mmol / g or more, more preferably 0.1 mmol / g or more, and even more preferably 0.2 mmol / g or more. Similarly, from the same viewpoint, it is preferably 3 mmol / g or less, more preferably 2 mmol / g or less, even more preferably 1 mmol / g or less, and even more preferably 0.5 mmol / g or less.

[0021] From the viewpoint of increasing the thickness of the composition, the rate of introduction of modifying groups in modified cellulose fibers having modifying groups is preferably 10 mol% or more, more preferably 30 mol% or more, and even more preferably 40 mol% or more. Similarly, from the same viewpoint, it is preferably 100 mol% or less, more preferably 70 mol% or less, and even more preferably 60 mol% or less.

[0022] The amount and introduction rate of modifying groups can be adjusted by the type and amount of modifying group added, the reaction temperature, the reaction time, the type of solvent, etc. The amount (mmol / g) and introduction rate (mol%) of modifying groups refer to the amount and percentage of modifying groups introduced (bound) to anionic groups in modified cellulose fibers having modifying groups. For example, when the anionic group is a carboxyl group, the amount and introduction rate of modifying groups in modified cellulose fibers having modifying groups can be calculated by the method described in the examples below.

[0023] The amount of component (A), i.e., the glucose portion in the modified cellulose fiber having a modifying group, is preferably 0.1% by mass or more, more preferably 10% by mass or more, and even more preferably 30% by mass or more, from the viewpoint of increasing the thickness of the composition, while from the viewpoint of handling during manufacturing, it is preferably 70% by mass or less, more preferably 60% by mass or less, and even more preferably 50% by mass or less of the composition.

[0024] In this specification, "glucose portion" refers to the portion consisting of glucose units in various types of cellulose fibers. In the case of unmodified cellulose fibers, it refers to the entire glucose unit; in the case of anionically modified cellulose fibers, it refers to the entire glucose unit including the anionic group attached to the glucose unit; and in the case of modified cellulose fibers having a modifying group, it refers to the entire glucose unit excluding the modifying group attached to the glucose unit. That is, in this specification, glucose units also include glucose units in which a hydroxymethyl group has been converted to a carboxyl group.

[0025] [Method for producing modified cellulose fibers having modifying groups] The method for producing modified cellulose fibers having a modifying group can be carried out by known methods without particular limitation, as long as the modifying group can be introduced into the anionically modified cellulose fibers described above.

[0026] A method for producing modified cellulose fibers having a modifying group includes, for example, a step of introducing anionic groups into raw cellulose fibers to obtain anionically modified cellulose fibers, and a step of introducing a modifying group into anionically modified cellulose fibers to obtain modified cellulose fibers having a modifying group.

[0027] From an environmental perspective, it is preferable to use natural cellulose fibers as raw materials. Examples of natural cellulose fibers include wood pulp such as coniferous pulp and hardwood pulp; cotton pulp such as cotton linters and cotton lint; non-wood pulp such as straw pulp and bagasse pulp; and bacterial cellulose. One of these can be used alone or in combination of two or more.

[0028] Examples of anionic groups introduced into the cellulose fibers used as raw materials include carboxyl groups, ()phosphorous groups, and sulfonic acid groups. Methods for introducing a carboxyl group as an anionic group into cellulose fibers include, for example, oxidizing the hydroxyl group of the cellulose fiber to convert it into a carboxyl group, or reacting the hydroxyl group of the cellulose fiber with at least one selected from the group consisting of compounds having a carboxyl group, acid anhydrides of compounds having a carboxyl group, and derivatives thereof.

[0029] One method for oxidizing the hydroxyl groups of cellulose fibers is described in Japanese Patent Publication No. 2015-143336 or Japanese Patent Publication No. 2015-143337, which involves reacting 2,2,6,6-tetramethyl-1-piperidine-N-oxyl (TEMPO) as a catalyst with an oxidizing agent such as sodium hypochlorite and a bromide such as sodium bromide, using cellulose fibers as a raw material. By oxidizing cellulose fibers using TEMPO as a catalyst, anionically modified cellulose fibers (referred to as "TEMPO-oxidized cellulose fibers") can be obtained in which the hydroxymethyl group at the C6 position of glucose in the cellulose fiber constituent unit is selectively converted to a carboxyl group.

[0030] Methods for introducing ()phosphorous groups as anionic groups into cellulose fibers include mixing powder or aqueous solution of ()phosphorous or ()phosphorous derivatives with dry or wet cellulose fibers, or adding aqueous solution of ()phosphorous or ()phosphorous derivatives to a dispersion of cellulose fibers. When these methods are employed, generally, after mixing or adding powder or aqueous solution of ()phosphorous or ()phosphorous derivatives), dehydration treatment and heat treatment are performed.

[0031] One method for introducing phosphate groups as anionic groups into cellulose fibers is described in Japanese Patent Publication No. 7196051, which involves impregnating raw cellulose fibers with a mixed aqueous solution of ammonium dihydrogen phosphate and urea to phosphate esterify the hydroxyl groups of the cellulose fibers. Methods for introducing sulfonic acid groups as anionic groups into cellulose fibers include adding sulfuric acid to the cellulose fibers and heating them.

[0032] The modifying group is introduced by the reaction of a compound for introducing the modifying group (referred to herein as the "modifying compound") with an anionically modified cellulose fiber. Thus, the modified cellulose fiber having the modifying group of component (A) will have the modifying group via ionic and / or covalent bonds. When the modifying group is attached to a hydroxyl group in an anionically modified cellulose fiber, the bonding between the modifying group and the anionically modified cellulose fiber is covalent, and examples include ether bonds, ester bonds, and carbonate bonds.

[0033] When the modifying group is bonded to an anionic group in an anionic-modified cellulose fiber, the bond between the modifying group and the anionic-modified cellulose fiber is either ionic or covalent. In the case of an ionic bond, the modifying compound having a cationic group bonds to the anionic group via electrostatic interaction. In the case of a covalent bond, the two are bonded via ester bonds, amide bonds, etc. In particular, when the anionic group is a carboxyl group, the bond is formed via ester bonds, amide bonds, carbonate bonds, urethane bonds, etc.

[0034] When the modifying group is bonded to an anionic group, one method is to bond the modifying group to the cellulose fiber by an ionic bond, which can be achieved by known methods. For example, the method described in Japanese Patent Application Publication No. 2015-143336 can be used, in which the modifying group and the anionic group are bonded by an ionic bond. When the anionic group is a carboxyl group, one method is to bond the modifying group to the cellulose fiber by covalent bonds, which can be achieved by known methods. For example, the method described in Japanese Patent Application Publication No. 2015-143337 can be used, in which the modifying group and the anionic group are bonded by an amide bond, which is a type of covalent bond.

[0035] Therefore, one embodiment in which the modifying group is bonded to an anionic group is that the modifying group in the modified cellulose fiber having the modifying group of component (A) is bonded to the glucose constituting the cellulose via ionic bonds and / or amide bonds.

[0036] [Modifying group] Examples of modifying groups include (a) hydrocarbon groups and (b) polymer groups.

[0037] (a) hydrocarbon group Examples of hydrocarbon groups include monovalent hydrocarbon groups, such as chain-type saturated hydrocarbon groups, chain-type unsaturated hydrocarbon groups, cyclic saturated hydrocarbon groups, and (heterocyclic) aromatic hydrocarbon groups. The hydrocarbon group has 1 or more carbon atoms, preferably 3 or more, more preferably 8 or more, and even more preferably 10 or more, while preferably 30 or less, more preferably 22 or less, and even more preferably 18 or less. The hydrocarbon group may have substituents as described later, and a portion of the hydrocarbon group may be substituted with hydrogen nitride groups.

[0038] Specific examples of chain-type saturated hydrocarbon groups include, for example, methyl group, ethyl group, propyl group, isopropyl group, butyl group, sec-butyl group, tert-butyl group, isobutyl group, pentyl group, tert-pentyl group, isopentyl group, hexyl group, isohexyl group, heptyl group, octyl group, 2-ethylhexyl group, nonyl group, decyl group, dodecyl group, tridecyl group, trioctyl group, tetradecyl group, octadecyl group, docosyl group, octacosanyl group, and the like.

[0039] Specific examples of chain-like unsaturated hydrocarbon groups include, for example, allyl group, propenyl group, ethylene group, propylene group, butene group, isobutene group, isoprene group, pentene group, hexene group, heptene group, octene group, nonene group, decene group, dodecene group, tridecene group, tetradecene group, and octadecene group.

[0040] Specific examples of cyclic saturated hydrocarbon groups include, for example, cyclopropane, cyclobutyl, cyclopentane, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cyclododecyl, cyclotridecyl, cyclotetradecyl, and cyclooctadecyl groups.

[0041] Aromatic hydrocarbon groups are selected from the group consisting of, for example, aryl groups and aralkyl groups.

[0042] Examples of aryl groups include phenyl, naphthyl, anthryl, phenanthryl, biphenyl, triphenyl, terphenyl groups, and groups in which these groups are substituted with substituents described later.

[0043] Examples of aralkyl groups include benzyl, dibenzyl, trityl, phenethyl, phenylpropyl, phenylpentyl, phenylhexyl, phenylheptyl, phenyloctyl, and groups in which the aromatic groups of these groups are further substituted with substituents.

[0044] (b) Polymer group A polymer group is a functional group containing a polymer structure. The molecular weight of the polymer group is preferably 100 or more, more preferably 200 or more, more preferably 300 or more, more preferably 400 or more, even more preferably 600 or more, even more preferably 1,000 or more, and even more preferably 1,500 or more, from the viewpoint of increasing the viscosity of the composition. From a similar viewpoint, it is preferably 10,000 or less, more preferably 7,000 or less, even more preferably 5,000 or less, even more preferably 4,000 or less, even more preferably 3,500 or less, and even more preferably 2,500 or less.

[0045] From the viewpoint of thickening the composition, the polymer group is preferably a functional group having a repeating structure linked by an oxygen atom, more preferably a functional group having a repeating structure linked by an oxygen atom, such as a polyoxyalkylene structure (alkylene oxide chain) or a polysiloxane structure (silicone chain), more preferably a functional group having a polyoxyalkylene structure, and even more preferably an alkoxypolyoxyalkylene group.

[0046] (b-1) Polysiloxane structure (silicone chain) A polysiloxane structure (silicone chain) is a structure in which siloxane bonds form the main chain, and which may also contain alkylene groups. The polysiloxane structure may also have substituents as described later.

[0047] (b-2) Polyoxyalkylene structure (alkylene oxide chain) From the viewpoint of thickening the composition, the polyoxyalkylene structure (alkylene oxide chain) is preferably a (co)polymer structure of one or more oxyalkylenes selected from oxyalkylenes having 2 to 8 carbon atoms, more preferably a (co)polymer structure of one or more oxyalkylenes selected from oxyalkylenes having 2 to 4 carbon atoms, even more preferably a (co)polymer structure of one or two oxyalkylenes selected from ethylene oxide (EO) and propylene oxide (PO), and even more preferably a copolymer structure (also called an (EO / PO) structure) in which ethylene oxide (EO) and propylene oxide (PO) are polymerized randomly or in blocks.

[0048] For example, a polyoxyalkylene structure can be represented by the following formula:

[0049] [ka]

[0050] (In the formula, R 1represents a hydrogen atom, a hydrocarbon group having 1 to 6 carbon atoms, or a -CH2CH(CH3)NH2 group. EO and PO are present randomly or in blocks, where a is 0 or a positive number representing the average number of moles of EO added, and b is 0 or a positive number representing the average number of moles of PO added. However, a and b cannot be 0 at the same time.) Examples of groups include those shown by ).

[0051] R 1 When is a linear or branched alkyl group having 1 to 6 carbon atoms, the alkyl group is preferably a methyl group, an ethyl group, an n-propyl group, and a sec-propyl group. 1 It may be a hydrogen atom.

[0052] From the viewpoint of thickening the composition, a is preferably 0 or more, more preferably 1 or more, even more preferably 3 or more, even more preferably 6 or more, even more preferably 11 or more, even more preferably 15 or more, even more preferably 20 or more, even more preferably 25 or more, and even more preferably 30 or more. From a similar viewpoint, it is preferably 100 or less, more preferably 70 or less, even more preferably 60 or less, even more preferably 50 or less, and even more preferably 40 or less.

[0053] From the viewpoint of thickening the composition, b is preferably 0 or more, more preferably 1 or more, even more preferably 3 or more, and still more preferably 5 or more. From a similar viewpoint, it is preferably 50 or less, more preferably 40 or less, even more preferably 30 or less, even more preferably 25 or less, even more preferably 20 or less, even more preferably 15 or less, and still more preferably 10 or less.

[0054] In the above formula, a+b represents the average number of moles added in total of EO and PO, and is preferably 4 or more, more preferably 6 or more, more preferably 8 or more, and from a similar viewpoint, preferably 100 or less, more preferably 70 or less.

[0055] Examples of the alkylene group having 1 to 3 carbon atoms include the methylene group, the ethylene group, and the propylene group.

[0056] The PO content (mol%) in the (EO / PO) chain can be calculated based on a and b above, specifically from b × 100 / (a ​​+ b). From the viewpoint of thickening the composition, the PO content is preferably 1 mol% or more, more preferably 5 mol% or more, even more preferably 7 mol% or more, and still more preferably 10 mol% or more. From a similar viewpoint, it is preferably 100 mol% or less, more preferably 90 mol% or less, even more preferably 85 mol% or less, even more preferably 75 mol% or less, even more preferably 60 mol% or less, even more preferably 50 mol% or less, even more preferably 40 mol% or less, and still more preferably 30 mol% or less.

[0057] From the viewpoint of thickening the composition, the formula weight (molecular weight) of the polyoxyalkylene structure is preferably 100 or more, more preferably 200 or more, even more preferably 300 or more, even more preferably 500 or more, even more preferably 1,000 or more, and even more preferably 1,500 or more. From a similar viewpoint, it is preferably 10,000 or less, more preferably 7,000 or less, even more preferably 5,000 or less, even more preferably 4,000 or less, even more preferably 3,500 or less, and even more preferably 2,500 or less.

[0058] (c) Further substituents The modifying group may have further substituents. Examples of substituents include alkoxy groups having 1 to 6 carbon atoms, such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, tert-butoxy, pentyloxy, isopentyloxy, and hexyloxy groups; methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl, and sec-butoxycarbonyl groups. Examples include alkoxy-carbonyl groups with 1 to 6 carbon atoms, such as tert-butoxycarbonyl, pentyloxycarbonyl, and isopentyloxycarbonyl groups; halogen atoms such as fluorine, chlorine, bromine, and iodine atoms; acyl groups with 1 to 6 carbon atoms, such as acetyl and propionyl groups; aralkyl groups; aralkyloxy groups; alkylamino groups with 1 to 6 carbon atoms; dialkylamino groups with 1 to 6 carbon atoms in the alkyl group; and hydroxyl groups.

[0059] [Modification compound] Modifying compounds include those having the above-mentioned modifying group and capable of binding to anionically modified cellulose fibers, from the viewpoint of increasing the thickness of the composition. When TEMPO-oxidized cellulose fibers are used as anionically modified cellulose fibers, preferred modifying compounds include compounds having a modifying group and a cationic group, and more preferably compounds having a modifying group and an amino group or a quaternary ammonium group. Preferred examples of modifying compounds include amine compounds having a modifying group and at least one amino group in the molecule, from the viewpoint of increasing the viscosity of the composition. More specifically, examples include amine compounds having a hydrocarbon group and polymer compounds having an amino group (e.g., amine compounds having a polysiloxane structure, amine compounds having a polyoxyalkylene structure, etc.).

[0060] Such amine compounds may be primary amines, secondary amines, tertiary amines, and quaternary ammonium compounds (i.e., quaternary ammonium cations or their salts). From the viewpoint of reactivity, the anionic component of the quaternary ammonium compound is preferably a halogen ion such as chloride ions or bromide ions, bisulfate ions, perchlorate ions, tetrafluoroborate ions, hexafluorophosphonate ions, trifluoromethanesulfonate ions, or hydroxy ions.

[0061] (a) Amine compounds having a hydrocarbon group Specific examples of amine compounds having a hydrocarbon group include primary to tertiary amines such as ethylamine, diethylamine, triethylamine, propylamine, dipropylamine, butylamine, dibutylamine, hexylamine, 2-ethylhexylamine, dihexylamine, trihexylamine, octylamine, dioctylamine, trioctylamine, dodecylamine, didodecylamine, stearylamine, distearylamine, monoethanolamine, diethanolamine, triethanolamine, oleylamine, aniline, octadecylamine, dimethylbehenylamine, benzylamine, dibenzylamine, tritylamine, naphthylamine, imidazole, 2-methylimidazole, 2-ethylimidazole, 2-phenylimidazole, 2-ethyl-4-methylimidazole, 2-phenyl-4-methylimidazole, and 1-(3-aminopropyl)imidazole.

[0062] Examples of quaternary ammonium compounds include tetramethylammonium hydroxide (TMAH), tetraethylammonium hydroxide (TEAH), tetraethylammonium chloride, tetrapropylammonium hydroxide (TPAH), tetrabutylammonium hydroxide (TBAH), tetrabutylammonium chloride, lauryltrimethylammonium chloride, dilauryldimethylammonium chloride, stearyltrimethylammonium chloride, distearyldimethylammonium chloride, cetyltrimethylammonium chloride, and alkylbenzyldimethylammonium chloride.

[0063] Amine compounds having hydrocarbon groups can be obtained using commercially available products or prepared according to known methods.

[0064] Furthermore, hydrocarbon compounds having cationic groups may also have substituents. Specific examples of substituents include those described in "(c) Further substituents" above.

[0065] (b-1) Amine compounds having a polysiloxane structure Examples of such amine compounds include those having a structure in which an amino group is bonded to a polysiloxane structure via an alkylene group or the like. In this specification, such amine compounds may be referred to as "amino-modified silicones." Amino-modified silicones can be used commercially or prepared according to known methods. One type of amino-modified silicone may be used, or two or more types may be used.

[0066] In terms of performance, amino-modified silicones include Momentive Performance Materials' TSF4703 (kinematic viscosity: 1000, amino equivalent: 1600) and TSF4708 (kinematic viscosity: 1000, amino equivalent: 2800), and Toray Dow Corning Silicone's SS-3551 (kinematic viscosity: 1000, amino equivalent: 1600), SF8457C (kinematic viscosity: 1200, amino equivalent: 1800), SF8417 (kinematic viscosity: 1200, amino equivalent: 1700), and BY16-209 (kinematic viscosity: 500, amino equivalent: 1800), B Preferred products include Y16-892 (kinematic viscosity: 1500, amino equivalent: 2000), BY16-898 (kinematic viscosity: 2000, amino equivalent: 2900), FZ-3760 (kinematic viscosity: 220, amino equivalent: 1600), KF8002 (kinematic viscosity: 1100, amino equivalent: 1700), KF867 (kinematic viscosity: 1300, amino equivalent: 1700), KF-864 (kinematic viscosity: 1700, amino equivalent: 3800), BY16-213 (kinematic viscosity: 55, amino equivalent: 2700), and BY16-853U (kinematic viscosity: 14, amino equivalent: 450) from Shin-Etsu Chemical Co., Ltd. (In parentheses, kinematic viscosity is measured at 25°C (unit: mm) 2 The value is expressed as ( / s), and the unit of amino equivalent is g / mol.

[0067] (b-2) Amine compounds having a polyoxyalkylene structure In amine compounds, it is preferable that the polyoxyalkylene structure and the nitrogen atom of the amine compound are bonded directly or via a linking group. The linking group is preferably a hydrocarbon group, and more preferably an alkylene group having 1 to 6 carbon atoms, and more preferably 1 to 3 carbon atoms. Examples of such alkylene groups include ethylene and propylene groups.

[0068] Examples of amine compounds having a polyoxyalkylene structure include the following formula (i):

[0069] [ka]

[0070] Examples of compounds are shown in formula (i). 1 a and b are R in the formula that shows an example of the polyoxyalkylene structure mentioned above. 1 , is the same as a and b. Amine compounds having a polyoxyalkylene structure are compounds for introducing modifying groups represented by the polyoxyalkylene structure, and can be prepared according to known methods. For example, ethylene oxide and propylene oxide can be added in desired amounts to a propylene glycol alkyl ether, and then the hydroxyl group terminus can be aminated. If necessary, the alkyl ether can be cleaved with an acid to form a hydrogen atom at the terminus. Methods for producing these compounds can be found in Japanese Patent Publication No. 3-181448, and details of such amine compounds are described, for example, in Japanese Patent No. 6105139.

[0071] Amine compounds having a polyoxyalkylene structure can preferably be commercially available, for example. Specific examples of amine compounds that may have a hydrocarbon group and are accompanied by the aforementioned EO chain or PO chain include SUNBRIGHT MEPA-10H, SUNBRIGHT MEPA-20H, SUNBRIGHT MEPA-50H, SUNBRIGHT MEPA-10T, SUNBRIGHT MEPA-12T, SUNBRIGHT MEPA-20T, SUNBRIGHT MEPA-30T, SUNBRIGHT MEPA-40T, etc., manufactured by NOF Corporation.

[0072] Specific examples of amine compounds (abbreviated as "EO / PO amines") that may have a hydrocarbon group and are associated with the aforementioned EO / PO chain include Jeffamine M-2070, Jeffamine M-2005, Jeffamine M-2095, Jeffamine M-1000, Jeffamine M-600, Surfoamine B200, Surfoamine L100, Surfoamine L200, Surfoamine L207, Surfoamine L300, Surfoamine B-100, XTJ-501, XTJ-506, XTJ-507, XTJ-508, M3000, Jeffamine ED-600, Jeffamine ED-900, Jeffamine ED-2003, Jeffamine D-230, Jeffamine D-400, Jeffamine D-2000, and Jeffamine, all manufactured by Huntsman. Examples include D-4000, XTJ-510, Jeffamine T-3000, Jeffamine T-5000, XTJ-502, XTJ-509, and XTJ-510. These may be used individually or in combination of two or more types.

[0073] After the introduction of the modifying group, post-treatment may be performed as appropriate to remove unreacted compounds, etc. Examples of post-treatment methods include filtration, centrifugation, and dialysis.

[0074] [Miniaturization process] By micronizing raw cellulose fibers, anionically modified cellulose fibers, or modified cellulose fibers having modifying groups, micrometer-scale cellulose fibers can be micronized to the nanometer scale. Reducing the average fiber diameter to nanometer size improves dispersibility, which is preferable.

[0075] The average fiber diameter of the micronized cellulose fibers, anionically modified cellulose fibers, or modified cellulose fibers having modifying groups (hereinafter referred to as micronized fibers) is preferably 0.1 nm or more from the viewpoint of increasing the viscosity of the composition. Furthermore, the average fiber diameter of the micronized fibers is preferably 100 nm or less from the viewpoint of enhancing the handling properties of the composition with modified cellulose fibers having modifying groups.

[0076] The average fiber length of the micronized fibers is preferably 150 nm or more from the viewpoint of increasing the viscosity of the composition. Furthermore, the average fiber length of the micronized fibers is preferably 1000 nm or less from the viewpoint of enhancing the handling properties of the composition with modified cellulose fibers having modifying groups.

[0077] The average aspect ratio of the micronized fibers is preferably 1 or greater from the viewpoint of increasing the viscosity of the composition. Furthermore, the average aspect ratio of the micronized fibers is preferably 250 or less from the viewpoint of enhancing the handling properties of the resin composition with modified cellulose fibers having modifying groups.

[0078] For the micronization process, known micronization methods can be employed. For example, to obtain modified cellulose fibers with a nanometer-sized average fiber diameter and modifying groups, a processing method using a grinder such as a muscoloider or a processing method using a high-pressure homogenizer in a medium can be implemented.

[0079] In addition to high-pressure homogenizers, other known dispersers are also suitably used in the micronization process. For example, dissociators, beaters, low-pressure homogenizers, grinders, mascolloiders, cutter mills, ball mills, jet mills, short-screw extruders, twin-screw extruders, ultrasonic stirrers, and household juicer mixers can be used. Furthermore, the solid content concentration of the modified cellulose fibers having modifying groups in the micronization process is preferably 50% by mass or less.

[0080] [Short fiber treatment] In the present invention, various cellulose fibers, namely raw cellulose fibers, anionically modified cellulose fibers, modified cellulose fibers having modifying groups, and modified cellulose fibers having finely milled modifying groups, may be subjected to a shortening treatment. By performing such a shortening treatment, the dispersibility of modified cellulose fibers having finely milled modifying groups can be improved. The short fiber treatment can be carried out by subjecting the target cellulose fibers to one or more treatment methods selected from the group consisting of (i) alkali treatment, (ii) acid treatment, (iii) heat treatment, ultraviolet treatment, electron beam treatment, mechanical treatment, and enzymatic treatment.

[0081] [Component (B)] Component (B) in this invention is an organic acid or a salt thereof having an acid dissociation constant pKa of -5 or more and 6 or less in aqueous solution. Here, in the case of a polyhydric organic acid, pKa1 is treated as the pKa. Note that the acid dissociation constant pKa was measured in water at 25°C. From the viewpoint of thickening effect, the acid dissociation constant pKa of the organic acid is 6 or less, preferably 5 or less, and more preferably 4 or less. On the other hand, from the viewpoint of availability, the pKa is -5 or higher, preferably -4 or higher, and more preferably -3 or higher.

[0082] Examples of organic acids include carboxylic acids, sulfonic acids, sulfinic acids, and (aromatic) sulfonamides. In addition, phenols, enols, thiophenols, and oximes can also be used as organic acids. Examples of carboxylic acids include saturated fatty acids, unsaturated fatty acids, and aromatic carboxylic acids. The number of carboxyl groups in a carboxylic acid is not limited, and it may be a monocarboxylic acid, dicarboxylic acid, or tricarboxylic acid. Examples of saturated fatty acids include acetic acid and stearic acid. Examples of unsaturated fatty acids include oleic acid. Examples of aromatic carboxylic acids include salicylic acid. Examples of dicarboxylic acids include adipic acid, sebacic acid, oxalic acid, succinic acid, and maleic acid. In addition, carboxylic acids such as hydroxy acids with substituents may also be used, such as citric acid, lactic acid, and malic acid. Examples of sulfonic acids include alkylbenzenesulfonic acids such as dodecylbenzenesulfonic acid, p-toluenesulfonic acid, and octyl-p-toluenesulfonic acid.

[0083] In the present invention, organic sulfonic acids or their salts are preferred from the viewpoint of thickening effect, and more preferably alkylbenzenesulfonic acids such as dodecylbenzenesulfonic acid, sulfonic acids such as p-toluenesulfonic acid, or salts thereof.

[0084] Examples of counterions for organic acids in salts of organic acids include monovalent cations such as lithium ions, potassium ions, sodium ions, and ammonium ions, divalent cations such as magnesium ions and calcium ions, and trivalent cations such as aluminum ions.

[0085] When an organic acid salt is included as component (B), the mass of component (B) shall be the mass of the organic acid salt including the counterion, not the mass of the organic acid itself.

[0086] [Component (C)] Component (C) in this invention is a non-aqueous liquid that is liquid at 25°C and 1 atm, and has a relative permittivity of 30 or less at 25°C. A non-aqueous liquid is a liquid other than water.

[0087] The relative permittivity of component (C) at 25°C is 30 or less, more preferably 25 or less, and even more preferably 20 or less. The relative permittivity can be measured using a dielectric meter (e.g., BI-871 (manufactured by Brookhaven Instruments)) at a frequency of 10 kHz.

[0088] Examples of non-aqueous liquids include non-aqueous resins and organic solvents. Non-aqueous liquids may be used alone or in combination of two or more types.

[0089] Specific examples of non-aqueous resins include epoxy resins, urethane resins, acrylic resins, vinyl chloride resins, phenoxy resins, phenolic resins, urea resins, melamine resins, polyimide resins, silicone resins, unsaturated polyester resins, diallyl phthalate resins, and rubber-based resins. Among these, epoxy resins, urethane resins, and acrylic resins are preferred from the viewpoint of availability. When incorporating non-aqueous resins, they are used as monomers and / or prepolymers.

[0090] Specific examples of organic solvents include alcohols such as methanol, ethanol, propanol, 2-methoxyethanol (methyl cellosolve), 2-ethoxyethanol (ethyl cellosolve), and 1-methoxy-2-propanol (PGME); tetrahydrofuran (THF), diethyl ether, ethylene glycol, and propylene glycol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; ethyl acetate, butyl acetate, ethylene glycol monoethyl ether acetate (ethyl cellosolve acetate), and diethylene glycol monomethyl ether acetate. Examples include esters such as tate (carbitol acetate) and propylene glycol monomethyl ether acetate (PGMEA); polyethylene glycol with an average molecular weight of 200 to 2000 (e.g., PEG200, PEG1000, etc.), saturated hydrocarbons, or unsaturated hydrocarbons; aromatic hydrocarbons such as benzene, toluene, and xylene; halogenated hydrocarbons such as methylene chloride and chloroform; lower alkyl ethers; and polar solvents such as N,N-dimethylformamide (DMF), N,N-dimethylacetamide, 1,3-dimethyl-2-imidazolidinone (DMI), and dimethyl sulfoxide. These can be used individually or in combination of two or more.

[0091] [Hardening agent] The composition may contain a curing agent. Depending on the type of non-aqueous resin used, a known curing agent can be selected and used.

[0092] When the non-aqueous resin is an epoxy resin, the curing agents used for epoxy resins include compounds that perform stoichiometric reactions, such as aliphatic polyamines, aromatic polyamines, dicyandiamides, polycarboxylic acids, polycarboxylic acid hydrazides, acid anhydrides, polymer captans, and polyphenols, as well as compounds that act catalytically, such as imidazoles, Lewis acid complexes, and onium salts. When compounds that perform stoichiometric reactions are used, curing accelerators such as various amines, imidazoles, Lewis acid complexes, onium salts, and phosphines can be used.

[0093] When the non-water-soluble resin is a urethane resin, examples of curing agents commonly used for urethane resins include aromatic isocyanates.

[0094] The amount of curing agent in this invention is not particularly limited, and an appropriate amount may be used depending on the type of curing agent.

[0095] [Component (D)] The composition of the present invention can be used as a conductive paste or ink by further incorporating metal particles as component (D). By applying the conductive paste or ink of the present invention onto a substrate and sintering the resulting coating film, it becomes possible to print narrow wiring on the substrate with a minimum amount of thickener.

[0096] Examples of metals (metal atoms) that constitute metal particles include Group 4 transition metals such as titanium and zirconium, Group 5 transition metals such as vanadium and niobium, Group 6 transition metals such as chromium, molybdenum, and tungsten, Group 7 transition metals such as manganese, technetium, and rhenium, Group 8 transition metals such as iron and ruthenium, Group 9 transition metals such as cobalt, rhodium, and iridium, Group 10 transition metals such as nickel, palladium, and platinum, Group 11 transition metals such as copper, silver, and gold, Group 12 transition metals such as zinc and cadmium, Group 13 metals such as aluminum, gallium, and indium, and Group 14 metals such as germanium, tin, and lead. The metals that constitute the metal particles may be used individually as single metals, or two or more may be used in combination as alloys. In particular, from the viewpoint of reducing the resistivity of the resulting metal film, the metal constituting the metal particles preferably includes at least one metal selected from the group consisting of metals from Group 4 to Group 14, in the 4th to 6th period.

[0097] More specifically, from the viewpoint of reducing the resistivity of the resulting metal film, the metal constituting the metal particles includes at least one selected from the group consisting of copper, silver, nickel, and tin.

[0098] The total content of metals from Groups 4 to 14 and Periods 4 to 6 in component (D) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more, from the viewpoint of reducing the resistivity of the resulting metal film.

[0099] The total content of at least one element selected from the group consisting of copper, silver, nickel, and tin in component (D) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more, from the viewpoint of reducing the resistivity of the resulting metal film.

[0100] The copper or silver content in component (D) is preferably 80% by mass or more, more preferably 90% by mass or more, even more preferably 95% by mass or more, even more preferably 98% by mass or more, and even more preferably 99% by mass or more, from the viewpoint of reducing the resistivity of the resulting metal film. The type of metal can be identified by high-frequency inductively coupled plasma atomic emission spectrometry.

[0101] The average particle size of component (D) is preferably 0.01 μm or larger, from the viewpoint of improving the dispersion stability of the metal particles and increasing the viscosity of the metal particle-containing composition, and preferably 10 μm or smaller, from the same viewpoint as above. The average particle size of component (D) is the particle size at 50% of the cumulative volume (D50), obtained by measuring the volume-based particle size distribution based on laser diffraction and scattering. Alternatively, when obtaining and using a product as component (D), the average particle size of component (D) may be based on the manufacturer's catalog value.

[0102] The particle size of component (D) can also be evaluated by measuring the amount that passes through a sieve. From the viewpoint of improving the dispersion stability of metal particles and increasing the viscosity of the metal particle-containing composition, the particle size of component (D) is preferably such that 95% or more passes through a sieve with a mesh size of 300 μm. In addition, when obtaining and using a product as component (D), the particle size of component (D) may be the value from the manufacturer's catalog or product specification.

[0103] The specific surface area of ​​component (D) is preferably 0.1 m² from the viewpoint of the conductivity of the resulting conductive member. 2 / g or more, and preferably 3.0m 2 It is less than / g. The specific surface area of ​​component (B) can be measured by the BET method. Alternatively, if a product is obtained and used as component (B), the specific surface area of ​​component (B) may be taken from the manufacturer's catalog value.

[0104] [Other ingredients] The composition may optionally contain known components such as pigments, dyes, polymerization initiators, plasticizers, stabilizers, and lubricants. The amount of such components is not particularly limited, and appropriate amounts may be used as needed.

[0105] [Method for manufacturing the composition] The composition of the present invention can be produced by mixing component (A), component (B), component (C), and optionally component (D), as well as other components. Accordingly, the composition of the present invention is composed of the above-mentioned components (A), component (B), component (C), and optionally component (D), as well as other components. Since component (C) can act as a medium for the composition of the present invention, it is preferable to manufacture the product in the following order: for example, by mixing component (A) and component (C), and then adding component (B) to the mixture.

[0106] The temperature at which each component is mixed may be room temperature, or it may be heated to a temperature above room temperature, preferably in the range of 50°C to 130°C, from the viewpoint of promoting dissolution in the medium.

[0107] [Composition of each component in the composition] [If ingredient (D) is not included in the composition] From the viewpoint of the thickening effect of modified cellulose fibers having modifying groups, the amount or content of component (A) in the composition is preferably 0.1% by mass or more, more preferably 1% by mass or more, even more preferably 3% by mass or more, and even more preferably 6% by mass or more. On the other hand, from the viewpoint of the handling properties of the composition, the amount or content of component (A) in the composition is preferably 20% by mass or less, more preferably 15% by mass or less, even more preferably 10% by mass or less, and even more preferably 8% by mass or less.

[0108] From the viewpoint of the thickening effect of modified cellulose fibers having modifying groups, the amount or content of component (A) in the composition is preferably 0.1 parts by mass or more, more preferably 1 part by mass or more, even more preferably 3 parts by mass or more, and even more preferably 5 parts by mass or more, per 100 parts by mass of component (C). On the other hand, from the viewpoint of enhancing the handling properties of the composition with modified cellulose fibers having modifying groups, the amount or content of component (A) in the composition is preferably 100 parts by mass or less, more preferably 50 parts by mass or less, even more preferably 30 parts by mass or less, even more preferably 20 parts by mass or less, and even more preferably 10 parts by mass or less, per 100 parts by mass of component (C).

[0109] The content of the glucose portion of component (A) in the composition is preferably 0.01% by mass or more, more preferably 0.1% by mass or more, even more preferably 1% by mass or more, and even more preferably 2% by mass or more, from the viewpoint of the thickening effect of the modified cellulose fibers having a modifying group. On the other hand, from the viewpoint of improving the dispersibility of the modified cellulose fibers having a modifying group, it is preferably 10% by mass or less, more preferably 8% by mass or less, even more preferably 6% by mass or less, and even more preferably 3% by mass or less, from the viewpoint of improving the dispersibility of the modified cellulose fibers having a modifying group.

[0110] From the viewpoint of improving the dispersibility of modified cellulose fibers having modifying groups, the content of the glucose portion of component (A) in the composition is preferably 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, even more preferably 1 part by mass or more, and even more preferably 3 parts by mass or more, per 100 parts by mass of component (C). On the other hand, from the viewpoint of handling during manufacturing, it is preferably 100 parts by mass or less, more preferably 40 parts by mass or less, even more preferably 30 parts by mass or less, and even more preferably 20 parts by mass or less, per 100 parts by mass of component (C).

[0111] The amount or content of component (B) in the composition is preferably 0.1 parts by mass or more, more preferably 0.5 parts by mass or more, even more preferably 1 part by mass or more, and even more preferably 5 parts by mass or more, per 100 parts by mass of component (C), from the viewpoint of interaction with modified cellulose fibers having modifying groups. On the other hand, from the viewpoint of handling during manufacturing, it is preferably 100 parts by mass or less, more preferably 50 parts by mass or less, even more preferably 40 parts by mass or less, and even more preferably 30 parts by mass or less, per 100 parts by mass of component (C).

[0112] From the viewpoint of the handling properties of the composition, the amount or content of component (C) in the composition is preferably 40% by mass or more, more preferably 50% by mass or more, even more preferably 60% by mass or more, and even more preferably 70 parts by mass or more. On the other hand, from the viewpoint of the thickening effect of the modified cellulose fibers having a modifying group, the amount or content of component (C) in the composition is preferably 95% by mass or less, more preferably 90% by mass or less.

[0113] The composition may contain water. From the viewpoint of mechanical strength when the composition is cured, it is preferable that the amount or content of water is small, preferably 5% by mass or less, more preferably 3% by mass or less, and even more preferably 1% by mass or less.

[0114] The content of each component can be calculated from the amount of each component included.

[0115] [When ingredient (D) is incorporated into the composition] When component (D) is incorporated into the composition, the amount or content of component (D) in the composition is preferably 50% by mass or more, more preferably 60% by mass or more, even more preferably 70% by mass or more, and even more preferably 75% by mass or more, from the viewpoint of obtaining low-resistance wiring, and preferably 97% by mass or less, more preferably 95% by mass or less, even more preferably 93% by mass or less, and even more preferably 91% by mass or less, from the viewpoint of dispersion stability of metal particles and increasing the viscosity of the metal particle-containing composition.

[0116] From the viewpoint of thickening by modified cellulose fibers having modifying groups, the amount or content of component (A) in the composition is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, even more preferably 0.05 parts by mass or more, and even more preferably 0.1 parts by mass or more, per 100 parts by mass of component (C). On the other hand, from the viewpoint of the handling properties of the composition, the amount or content of component (A) in the composition is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less.

[0117] The amount or content of component (B) in the composition is preferably 0.005 parts by mass or more, more preferably 0.01 parts by mass or more, even more preferably 0.02 parts by mass or more, and even more preferably 0.05 parts by mass or more, per 100 parts by mass of component (C), from the viewpoint of interaction with modified cellulose fibers having modifying groups. On the other hand, from the viewpoint of handling during manufacturing, it is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, even more preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less, per 100 parts by mass of component (C).

[0118] From the viewpoint of the handling properties of the composition, the amount or content of component (C) in the composition is preferably 1% by mass or more, more preferably 5% by mass or more, even more preferably 8% by mass or more, and even more preferably 10% by mass or more. On the other hand, from the viewpoint of the thickening effect of the modified cellulose fibers having a modifying group, the amount or content of component (C) in the composition is preferably 50% by mass or less, more preferably 40% by mass or less, and even more preferably 30% by mass or less.

[0119] In the composition of the present invention, the amount or content of component (C) relative to 100 parts by mass of component (D) is preferably 1 part by mass or more, more preferably 5 parts by mass or more, even more preferably 8 parts by mass or more, and even more preferably 10 parts by mass or more, from the viewpoint of improving the dispersion stability of the composition containing metal particles, and preferably 50 parts by mass or less, more preferably 45 parts by mass or less, and even more preferably 40 parts by mass or less, from the viewpoint of increasing the viscosity of the composition containing metal particles. More specifically, it is preferably 1 part by mass or more and 50 parts by mass or less, more preferably 5 parts by mass or more and 45 parts by mass or less, even more preferably 8 parts by mass or more and 40 parts by mass or less, and even more preferably 10 parts by mass or more and 35 parts by mass or less.

[0120] The composition may contain water. From the viewpoint of the mechanical strength when the composition is cured, it is preferable that the amount or content of water is small, preferably 5% by mass or less, more preferably 1% by mass or less, and even more preferably 0.1% by mass or less.

[0121] The content of each component can be calculated from the amount of each component included.

[0122] <Ink and conductive paste> The ink of the present invention is an ink comprising the above-mentioned components (A), (B), (C), and (D), and the conductive paste of the present invention is a conductive paste comprising the above-mentioned components (A), (B), (C), and (D). As described above, by further incorporating metal particles as component (D) into the above composition of the present invention, it can be used as a conductive paste or ink. By applying the ink or conductive paste of the present invention onto a substrate and sintering the resulting coating film, it becomes possible to print narrow wiring on the substrate. As described above, the composition of the present invention has a high viscosity-enhancing effect, and the ink or conductive paste of the present invention exhibits the same effect, making it suitable for application to electronic materials.

[0123] The ink or conductive paste of the present invention can be manufactured by mixing component (A), component (B), component (C), and component (D), as well as other components.

[0124] The preferred composition of each component in the ink or conductive paste of the present invention is the same as the preferred composition of each component described in "[When component (D) is incorporated into the composition]" in the above "[Composition of each component in the composition]". [Examples]

[0125] The present invention will be specifically described below with reference to examples. The following examples are merely illustrative of the present invention and do not imply any limitation. "Normal pressure" refers to a state without pressurization or depressurization, and "room temperature" refers to 25°C.

[0126] [Average fiber diameter and average fiber length of cellulose fibers and (shortened) anion-modified cellulose fibers] Deionized water was added to the cellulose fibers to be measured or a suspension containing the cellulose fibers to be measured to prepare a dispersion with a content of 0.01% by mass. This dispersion was measured using a wet dispersion type image analysis particle size distribution analyzer (Jusco International Co., Ltd., product name: IF-3200) under the following conditions: front lens: 2x, telecentric zoom lens: 1x, image resolution: 0.835 μm / pixel, syringe inner diameter: 6515 μm, spacer thickness: 500 μm, image recognition mode: ghost, threshold: 8, analysis sample volume: 1 mL, sampling: 15%. The length of the short axis when the cellulose fiber is approximated as a rectangle was defined as the fiber diameter, and the length of the long axis was defined as the fiber length. These values ​​were measured for 100 cellulose fibers, and the average value was calculated.

[0127] [Anionic group content of anionic-modified cellulose fibers] Take 0.5 g of the cellulose fiber to be measured with a dry mass into a beaker, add deionized water or a mixed solvent of methanol / deionized water = 2 / 1 (volume ratio) to make a total of 55 mL, and add 5 mL of 0.01 M aqueous sodium chloride solution thereto to prepare a dispersion. The dispersion was stirred until the cellulose fiber to be measured was sufficiently dispersed. 0.1 M hydrochloric acid was added to this dispersion to adjust the pH to 2.5 - 3, and using an automatic titrator (manufactured by TOA DK Kogyo Co., Ltd., AUT-701), 0.05 M aqueous sodium hydroxide solution was dropped into the dispersion under the condition of a waiting time of 60 seconds, and the values of conductivity and pH every 1 minute were measured. The measurement was continued until the pH reached about 11 to obtain a conductivity curve. The sodium hydroxide titration amount was determined from this conductivity curve, and the anionic group content of the cellulose fiber to be measured was calculated by the following formula. Anionic group content (mmol / g) = [Volume of aqueous sodium hydroxide solution titrated (mL) × Concentration of aqueous sodium hydroxide solution (0.05 M)] / [Mass of cellulose fiber to be measured (0.5 g)]

[0128] [Binding amount and introduction rate of modifying groups of modified cellulose fiber] The binding amount of the modifying group of the modified cellulose fiber was determined by the following IR measurement method, and its binding amount and introduction rate were calculated by the following formula. For the IR measurement, specifically, the infrared absorption spectrum of the dried cellulose fiber to be measured was measured by the ATR method using an infrared absorption spectrometer (IR) (manufactured by Thermo Fisher Scientific, Nicolet 6700), and the binding amount and introduction rate of the modifying group were calculated by Formula A. The following shows the case where the anionic group is a carboxyl group, that is, the case of oxidized cellulose fiber. The following "peak intensity at 1720 cm -1 " is the peak intensity derived from the carbonyl group. In the case of anionic groups other than carboxyl groups, the wavenumber value may be appropriately changed to calculate the binding amount and introduction rate of the modifying group. <Formula A> Binding amount of modifying group (mmol / g) = a × (b - c) ÷ b a: Carboxyl group content (mmol / g) of oxidized cellulose fiber b: Peak intensity at 1720 cm of oxidized cellulose fiber -1 c: Modified cellulose fiber 1720cm -1 Peak intensity <Formula B> Modification group introduction rate (mol%) = 100 × f / g f: Amount of modifying group attached (mmol / g) g: Carboxylate group content of oxidized cellulose fiber (mmol / g)

[0129] [Content of each ingredient] The content of each component other than water was calculated from the amount of each component used. The water content in the dispersions and suspensions was measured by Karl Fischer titration using a CA-200 machine manufactured by Mitsubishi Analytec Corporation. The solid content concentration in various cellulose fibers was calculated by measuring the water content in the sample using an infrared moisture meter (Shimadzu Corporation, MOC-120H) and taking the difference from 100% by mass. For 1 g of sample, the water content was measured every 30 seconds at a constant temperature of 150°C, and the value displayed when the mass decrease over 30 seconds was 0.1% or less was used.

[0130] [Glucose content] Regarding the glucose content, it was calculated by assuming that all the anionically modified cellulose fibers and modifying compounds blended during the preparation of the modified cellulose fibers were ionically bonded, and considering the mass of the anionically modified cellulose fibers contained in the blended modified cellulose fibers as the mass of the glucose portion.

[0131] [Measurement of electrical conductivity of filtrate] The electrical conductivity of the filtrate was measured using a compact electrical conductivity meter (LAQUAtwin EC-33B, manufactured by Horiba, Ltd.).

[0132] [Anionic modified cellulose fiber] As the raw material for component (A), anion-modified cellulose fiber 1 having the physical properties listed in Table 1 was used.

[0133] [Table 1]

[0134] Such anionically modified cellulose fibers 1 can be prepared, for example, by performing the following TEMPO oxidation treatment.

[0135] [TEMPO oxidation treatment] In a 2L PP beaker equipped with a mechanical stirrer and stirring blades, weigh out 20g of bleached kraft pulp fiber from coniferous trees (the raw material for natural cellulose fiber) and 1980g of deionized water, and stir at 25°C and 100rpm for 30 minutes. Next, add 0.26g of 2,2,6,6-tetramethyl-1-piperidine-N-oxyl (TEMPO), 2.6g of sodium bromide, and 70.0g of 10.5% by mass sodium hypochlorite aqueous solution to the 20g of pulp fiber in this order. Then, perform pH stat titration using an automatic titrator and add 0.5M sodium hydroxide aqueous solution dropwise to maintain the pH at 10.5. The reaction is carried out at 25°C for 120 minutes with a stirring speed of 100rpm. Next, while stirring, add 0.01M hydrochloric acid to adjust the pH of the suspension to 2. This hydrochloric acid treatment converts the anionic carboxyl group from the -COONa type to the -COOH type. Next, the solids are filtered off by suction filtration. The process of dispersing the solids in deionized water and filtering them off by suction filtration is repeated until the conductivity of the filtrate is 200 μS / cm or less. The resulting solids are then dehydrated to obtain anionic modified cellulose fibers.

[0136] Preparation Example 1 [Preparation of short-fiber anion-modified cellulose fibers 1] Anion-modified cellulose fiber 1 having the physical properties listed in Table 1 was subjected to a short-fiber treatment to obtain short-fiber anion-modified cellulose fiber 1 with an average fiber length of 183 μm. Specifically, 227 g (75 g solid content) of anionically modified cellulose fiber 1 cake was mixed with deionized water until the solid content concentration was reduced from the values ​​shown in Table 1 to 1% by mass. The resulting suspension was stirred at 95°C for 24 hours to obtain an aqueous suspension of short-fiber anionically modified cellulose fiber 1.

[0137] Preparation Example 2 [Preparation of Modified Cellulose Fiber 1] 1058.8g of 1-methoxy-2-propanol (PGME) and 655.2g of the above-mentioned short-fiber anionic modified cellulose fiber 1 aqueous suspension (solid content concentration: 1% by mass) were mixed, and 11.9g of EOPOamine was added to this mixture. The mixture was stirred at 25°C for 1 hour to obtain a mixture of modified cellulose fibers 1. The obtained mixture was dispersed three times at 150 MPa using a high-pressure homogenizer (NanoVeta L-ES, manufactured by Yoshida Machinery Industry Co., Ltd.). Furthermore, 200.0g of PEG200 was added to this mixture, and after stirring at 25°C for 30 minutes, the mixture was dispersed once at 150 MPa using a high-pressure homogenizer. Subsequently, water and PGME were removed using the evaporator described below to obtain a PEG200 dispersion of modified cellulose fiber 1. The mass ratio of PEG200, i.e., component (C), to modified cellulose fiber 1, i.e., component (A), in the obtained dispersion was 9.2 parts by mass of component (A) for every 100 parts by mass of component (C).

[0138] Evaporation conditions Water bath temperature: 85℃ Degree of pressure reduction (absolute pressure): 2-5 kPa Determination of distillation completion: This was determined when there was a mass reduction equivalent to the amount of water and organic solvent (PGME in this case) present.

[0139] Preparation Example 3 [Preparation of Modified Cellulose Fiber 2] An α-terpineol dispersion of modified cellulose fiber 2 was obtained using the same procedure as in Preparation Example 2, except that the amount of EOPO amine was doubled and the non-aqueous liquid was changed from PEG200 to α-terpineol. In the resulting dispersion, the mass ratio of α-terpineol, i.e., component (C), to modified cellulose fiber 2, i.e., component (A), was 12.3 parts by mass of component (A) for every 100 parts by mass of component (C).

[0140] Preparation Example 4 [Preparation of Modified Cellulose Fiber 3] An α-terpineol dispersion of modified cellulose fiber 3 was obtained using the same procedure as in Preparation Example 2, except that the non-aqueous liquid was changed from PEG200 to α-terpineol. In the obtained dispersion, the mass ratio of PEG200, i.e., component (C), to modified cellulose fiber 3, i.e., component (A), was 9.2 parts by mass of component (A) for every 100 parts by mass of component (C).

[0141] Table 2 shows the proportions of modified cellulose fibers 1-3. [Table 2]

[0142] Example 1 [Preparation of Composition] To 109.2 parts by mass of the PEG200 dispersion of modified cellulose fiber 1 obtained in Preparation Example 2, 5.7 parts by mass of p-toluenesulfonic acid was added and the mixture was stirred at 25°C for 10 minutes to obtain a composition containing components (A), (B), and (C). This composition was designated as the composition of Example 1.

[0143] Examples 2-5 [Preparation of Compositions] The compositions of Examples 2 to 5 were prepared in the same manner as in Example 1, except that the amount of p-toluenesulfonic acid added was changed to the amount shown in Table 3, or p-toluenesulfonic acid was replaced with dodecylbenzenesulfonic acid or oleic acid, and the amount added was further changed to the amount shown in Table 3.

[0144] Example 6 [Preparation of Composition] To 112.3 parts by mass of the α-terpineol dispersion of the modified cellulose fiber 2 obtained in Preparation Example 3, 25.0 parts by mass of dodecylbenzenesulfonic acid was added, and the mixture was stirred at 25°C for 10 minutes to obtain a composition containing components (A), (B), and (C). This composition was used as the composition for Example 6.

[0145] Examples 7-8 [Preparation of Composition] To 109.2 parts by mass of the α-terpineol dispersion of the modified cellulose fiber 3 obtained in Preparation Example 4, 1.6 parts by mass (Example 7) or 0.3 parts by mass (Example 8) of salicylic acid was added, and the mixture was stirred at 25°C for 10 minutes to obtain compositions containing components (A), (B), and (C). These compositions were designated as the composition of Example 7 and the composition of Example 8, respectively.

[0146] Reference Example 1 [Preparation of Composition] The PEG200 dispersion of modified cellulose fiber 1 obtained in Preparation Example 2 was used as the composition for Reference Example 1.

[0147] Reference Example 2 [Preparation of Composition] The α-terpineol dispersion of modified cellulose fiber 2 obtained in Preparation Example 3 was used as the composition for Reference Example 2.

[0148] Reference Example 3 [Preparation of Composition] The α-terpineol dispersion of modified cellulose fiber 3 obtained in Preparation Example 4 was used as the composition for Reference Example 3.

[0149] Comparative Example 1 [Preparation of Composition] To 121.8 g of the aqueous suspension of the short-fiber anionic modified cellulose fiber 1 obtained in Preparation Example 1, 211.8 g of PGME and 40 g of PEG200 were added, and the mixture was stirred at 25°C for 30 minutes. The mixture was then dispersed once at 150 MPa using a high-pressure homogenizer. Subsequently, water and PGME were removed by distillation under the above evaporator conditions to obtain a PEG200 dispersion of the short-fiber anionic modified cellulose fiber 1. In the obtained dispersion, the mass ratio of PEG200, i.e., component (C), to the short-fiber anionic modified cellulose fiber 1 was 3.1 parts by mass of short-fiber anionic modified cellulose fiber 1 per 100 parts by mass of component (C). Next, 5.4 parts by mass of p-toluenesulfonic acid were added to 103.1 parts by mass of the PEG200 dispersion, and the mixture was stirred at 25°C for 10 minutes to obtain the composition of Comparative Example 1.

[0150] Comparative Examples 2-3 [Preparation of Compositions] The composition of Comparative Example 2 or the composition of Comparative Example 3 was prepared in the same manner as in Comparative Example 1, except that the amount of p-toluenesulfonic acid added was changed to the amount shown in Table 4, or p-toluenesulfonic acid was replaced with dodecylbenzenesulfonic acid and the amount added was further changed to the amount shown in Table 4.

[0151] Reference Example 4 [Preparation of Composition] The PEG200 dispersion of the short-fiber anion-modified cellulose fiber 1 obtained in Comparative Example 1 was used as the composition for Reference Example 4.

[0152] Test Example 1 [Measurement of Viscosity of Composition] The viscosity of the composition was measured using a rheometer (Thermo Fisher Scientific, MARS40) and measuring fixtures ((top) P20 / Ti, P60 / Ti, (bottom) TMP20, TMP60) with the following program. Step 1: At 25°C, shear rate 0.01s -1 from 1000s -1 The shear rate was increased at a constant speed over a period of 90 seconds. Step 2: At 25°C, shear rate 1000s -1 from 0.01s -1 The shear rate was reduced at a constant speed over 90 seconds. Step 3: Increase the temperature from 25°C to 250°C at a rate of 15°C / min while maintaining a shear rate of 0.1s. -1 The viscosity was measured. In step 3, the shear viscosity at 30°C was measured.

[0153] In addition, when measuring the viscosity of each composition in the examples, comparative examples, and reference examples, each composition was prepared so that the amount of glucose portion in each composition was within a certain range, specifically, within the range of 3.2 ± 0.1 parts by mass of glucose portion per 100 parts by mass of component (C) in the composition. That is, the "glucose portion of component (A)" in Tables 3 to 4 is the value per 100 parts by mass of component (C).

[0154] The composition of each composition, the acid dissociation constant of component (B) in an aqueous solution at 25°C, and the measured viscosity are shown in Tables 3 and 4.

[0155] [Table 3]

[0156] [Table 4]

[0157] Please note that the quantities listed in the table refer to the amount of the active ingredient, not the quantity of the product itself. [Reagents and raw materials] In the examples, the following reagents and raw materials were used without special purification. ·Non-aqueous liquid PEG200 (manufactured by Fujifilm Wako Pure Chemical Industries, relative permittivity: 18.4) α-Terpineol (manufactured by Fujifilm Wako Pure Chemical Industries, relative permittivity: 4.0) Furthermore, both PEG200 and α-terpineol were liquid at 25°C and 1 atm. • Organic acids (Note that pKa is the acid dissociation constant in aqueous solution at 25°C.) p-Toluene sulfonic acid (pKa: -2.8, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) Dodecylbenzenesulfonic acid: Dodecylbenzenesulfonic acid (soft type) (mixture) (pKa: -0.5, manufactured by Tokyo Chemical Industry Co., Ltd.) Oleic acid (pKa: 5.4, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) Salicylic acid (pKa: 2.8, manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) ·others EO / PO amine: Methoxypoly(oxyethylene / oxypropylene)-2-propylamine (HUNTSMAN, Jeffermin M2070, Mw=2000, EO:PO=31:10) PGME: 1-Methoxy-2-propanol (manufactured by Daicel Corporation)

[0158] From the results of the above examples, the following became clear. When comparing Reference Example 1 and Examples 1-5, focusing on viscosity at 30°C, it was found that the viscosity of the compositions in Examples 1-5 increased compared to the viscosity of the composition in Reference Example 1. This was also true for Reference Example 2 and Example 6, which contained modified cellulose fiber 2, and for Reference Example 3 and Examples 7-8, which contained modified cellulose fiber 3. In particular, since the viscosity of the compositions in Examples 1-3 and 6 was in the range of 1030-1328 Pa·s, it was found that the thickening effect of the modified cellulose fiber with a modifying group was more strongly exhibited by component (B) with a smaller pKa value.

[0159] Comparing Reference Example 4 with Comparative Examples 1-3, it was found that in the case where the composition contained short-fiber anionic modified cellulose fibers instead of modified cellulose fibers with modifying groups, the viscosity actually decreased when the specified component (B) was added. This indicates that the thickening effect of component (B) is achieved not by anionically modified cellulose fibers, but by a combination with modified cellulose fibers that have modifying groups.

[0160] Furthermore, while Reference Example 4 showed good results in terms of viscosity, aggregates of several tens of micrometers were observed. The reason why the composition of Reference Example 4 became so viscous is presumed to be that the short-fiber anion-modified cellulose fibers were hydrophilic and therefore could not be nano-dispersed in PEG200, resulting in significant viscosity increase due to poor dispersion. If a large amount of aggregates derived from cellulose fibers remain in the composition, there is a high risk of causing a decrease in resistance when used as a conductive paste material, making it unsuitable for electronic material applications. Furthermore, comparative examples 1-3, like reference example 4, showed aggregates of several tens of micrometers in size, making them unsuitable for electronic material applications.

[0161] Examples 9-10, Comparative Examples 4-5, and Reference Example 5 [Preparation of Compositions Containing Metal Particles] The compositions prepared in Examples 1 and 7 and Reference Examples 1 and 3 were further enriched with copper particles as metal particles of component (D) and α-terpineol as a non-aqueous liquid of component (C) to prepare compositions with the formulations shown in Table 5. Specifically, each component listed in Table 5 was added to an agate mortar and kneaded until the metal particles were no longer visible, and the resulting mixture was transferred to a plastic container. The sealed plastic container was then stirred for 2000 min using a rotating and revolving agitator (Thinky Co., Ltd., Planetary Vacuum Mixer ARV-310). -1 The mixture was stirred at 2000 revolutions per minute for 5 minutes to obtain compositions containing the metal particles of Examples 9-10, Comparative Examples 4-5, and Reference Example 5.

[0162] The raw materials used in the preparation of the above composition are shown below. <Metal particles> • Copper particles (dried powder): Manufactured by Mitsui Mining & Smelting Co., Ltd., Variety: CH-0200L1 (Specific surface area: 4.2 m²) 2 / g, particle size distribution (D50): 0.21 μm (all values ​​are from the catalog.) <Non-aqueous liquid> • α-Terpineol: Manufactured by Fujifilm Wako Pure Chemical Industries, Ltd., special grade reagent.

[0163] The compositions obtained in Examples 9-10, Comparative Examples 4-5, and Reference Example 5 were evaluated in the same manner as in Test Example 1. The results are shown in Table 5. Note that the amounts listed in the table are the amounts of active ingredients, not the amounts of the product.

[0164] [Table 5]

[0165] The compositions of Examples 9 and 10 were found to have a higher viscosity-enhancing effect compared to the compositions of Comparative Examples 4 and 5. Therefore, it was found that the compositions of the present invention can exhibit a viscosity-enhancing effect even when metal particles are incorporated. Since such compositions contain metal particles, they can be expected to be used as conductive pastes or inks.

[0166] [Anionic modified cellulose fiber 2] The same effects as in the examples can be obtained by using an anionic modified cellulose fiber to which phosphoric acid has been introduced instead of the anionic modified cellulose fiber 1 to which a carboxyl group has been introduced. Such anionic modified cellulose fiber 2 can be prepared by the following phosphorylation treatment. [Phosphorication treatment] To 100 parts by mass of bleached kraft pulp fiber from coniferous trees, which is the raw material for natural cellulose fiber, an aqueous solution of ammonium dihydrogen phosphate and urea is impregnated, and the mixture is pressed to obtain chemically impregnated fiber with 56 parts by mass of ammonium dihydrogen phosphate and 150 parts by mass of urea. The chemically impregnated fiber is dried in a dryer at 105°C to evaporate the moisture. The dehydrated fiber is heated in a forced-air dryer set to 140°C for 4 minutes. To 100 parts by mass of the obtained fiber, 10,000 parts by mass of deionized water is added, and the fibers are dispersed by stirring, after which the solids are filtered off by suction filtration. To 100 parts by mass of the solids in the filtered cake, 10,000 parts by mass of deionized water is added, and the fibers are dispersed by stirring, after which the solids are filtered off by suction filtration. To the obtained cake, 10,000 parts by mass of deionized water are added, and while stirring, a 1N sodium hydroxide aqueous solution is added dropwise to obtain a slurry with a pH of 12-13. Next, while stirring, 0.01M hydrochloric acid is added to adjust the pH of the suspension to 2. Then, the solid components are filtered off by suction filtration. The cake is dispersed in deionized water, and the cake is filtered off by suction filtration. This process is repeated until the conductivity of the filtrate is 200 μS / cm or less. The resulting solid content is then dehydrated to obtain anionically modified cellulose fibers 2. [Industrial applicability]

[0167] The composition of the present invention has a thickening effect compared to conventional compositions, and therefore can be used in the field of electronic devices such as digital home appliances.

Claims

1. A composition comprising the following components (A), (B), and (C). Component (A): Modified cellulose fiber having a modifying group Component (B): Organic acid or salt thereof having an acid dissociation constant pKa of -5 or more and 6 or less in aqueous solution. Component (C): A non-aqueous liquid that is liquid at 25°C and 1 atm, with a relative permittivity of 30 or less at 25°C.

2. The composition according to claim 1, wherein the modified cellulose fibers having a modifying group have the modifying group via ionic and / or covalent bonds.

3. The composition according to claim 1, wherein the amount of component (A) blended with 100 parts by mass of component (C) is 0.1 parts by mass or more and 100 parts by mass or less.

4. The composition according to claim 1, wherein the content of the glucose portion of component (A) per 100 parts by mass of component (C) is 0.01 parts by mass or more and 100 parts by mass or less.

5. The composition according to claim 1, wherein the amount of component (B) blended with 100 parts by mass of component (C) is 1 part by mass or more and 100 parts by mass or less.

6. The composition according to claim 1, wherein the amount of component (A) in the composition is 0.1% by mass or more and 20% by mass or less.

7. The composition according to claim 1, wherein the content of the glucose portion of component (A) in the composition is 0.01% by mass or more and 10% by mass or less.

8. The composition according to claim 1, wherein component (B) is an organic sulfonic acid or a salt thereof.

9. The composition according to claim 1, further comprising the following component (D). Component (D): Metal particles

10. An ink comprising the following components (A), (B), (C), and (D). Component (A): Modified cellulose fiber having a modifying group Component (B): Compound with a melting point of 80°C or higher Component (C): Non-aqueous liquid that is liquid at 25°C and 1 atm. Component (D): Metal particles

11. A conductive paste comprising the following components (A), (B), (C), and (D). Component (A): Modified cellulose fiber having a modifying group Component (B): Compound with a melting point of 80°C or higher Component (C): Non-aqueous liquid that is liquid at 25°C and 1 atm. Component (D): Metal particles

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