WO2012043280A1 - 変性ポリビニルアルコール、変性ポリビニルアセタール及びセラミックスラリー組成物 - Google Patents
変性ポリビニルアルコール、変性ポリビニルアセタール及びセラミックスラリー組成物 Download PDFInfo
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- WO2012043280A1 WO2012043280A1 PCT/JP2011/071236 JP2011071236W WO2012043280A1 WO 2012043280 A1 WO2012043280 A1 WO 2012043280A1 JP 2011071236 W JP2011071236 W JP 2011071236W WO 2012043280 A1 WO2012043280 A1 WO 2012043280A1
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- polyvinyl alcohol
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- C08F8/00—Chemical modification by after-treatment
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- C08F116/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F116/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F116/04—Acyclic compounds
- C08F116/06—Polyvinyl alcohol ; Vinyl alcohol
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
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- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63416—Polyvinylalcohols [PVA]; Polyvinylacetates
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- C04B35/4682—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates based on titanates based on alkaline earth metal titanates based on barium titanates based on BaTiO3 perovskite phase
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- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/6342—Polyvinylacetals, e.g. polyvinylbutyral [PVB]
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F16/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F16/02—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F16/04—Acyclic compounds
- C08F16/06—Polyvinyl alcohol ; Vinyl alcohol
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- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/38—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an acetal or ketal radical
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- C08F8/00—Chemical modification by after-treatment
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- C08F8/00—Chemical modification by after-treatment
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- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5445—Particle size related information expressed by the size of the particles or aggregates thereof submicron sized, i.e. from 0,1 to 1 micron
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6025—Tape casting, e.g. with a doctor blade
Definitions
- the present invention relates to a modified polyvinyl alcohol capable of producing a polyvinyl acetal having a low degree of polymerization and excellent solubility in a solvent without causing any reaction inhibition, coloring or particle coarsening.
- the present invention also relates to a method for producing the modified polyvinyl alcohol.
- the present invention also relates to a modified polyvinyl acetal having a low degree of polymerization, excellent solubility in a solvent, and high elasticity, mechanical strength, and film forming property.
- the present invention relates to a method for producing the modified polyvinyl acetal, a polyvinyl acetal film using the modified polyvinyl acetal, a method for producing the polyvinyl acetal film, a ceramic slurry composition, a method for producing the ceramic slurry composition, and a ceramic green sheet.
- Polyvinyl acetal typified by polyvinyl butyral is used for various purposes in interlayer films for laminated glass, wash primer for metal treatment, various paints, adhesives, resin processing agents, ceramic binders, etc. Is expanding.
- the reason why polyvinyl acetal is used in various ways is that the characteristics of the resin can be adjusted by controlling the degree of polymerization and the degree of acetalization.
- polyvinyl acetal is produced by dehydrating condensation of polyvinyl alcohol and an aldehyde compound in the presence of an acid catalyst such as hydrochloric acid.
- the degree of polymerization of the polyvinyl acetal thus produced is substantially determined by the degree of polymerization of the starting polyvinyl alcohol. Therefore, in order to control the properties of the polyvinyl acetal, it is necessary to prepare a raw material polyvinyl alcohol that has been accurately adjusted so as to have the same degree of polymerization with respect to the target polyvinyl acetal.
- Polyvinyl alcohol is produced by saponifying polyvinyl acetate solution polymerized in methanol.
- polyvinyl alcohol produced by a known method is industrially manufacturable because of problems with productivity and quality, and is limited to those having a degree of polymerization of about 300 or more. It is difficult to obtain a polyvinyl acetal having a degree of polymerization.
- Patent Document 2 discloses a method of using a solvent having a high chain transfer constant for the polymerization of vinyl acetate
- Patent Document 3 discloses a chain transfer agent before polymerization and polymerization. A method of polymerizing vinyl acetate while being fed into is disclosed.
- Patent Document 4 discloses a method in which polyvinyl alcohol is subjected to main chain cleavage using an oxidizing agent such as hydrogen peroxide and reduced to reduce the degree of polymerization.
- an oxidizing agent such as hydrogen peroxide
- the polyvinyl acetal obtained after acetalization has a low degree of acetalization due to reaction inhibition, or the polyvinyl acetal particles are coarsened. There was a problem to do.
- the multilayer ceramic capacitor is also required to have a small size and large capacity, and attempts have been made to stack thin ceramic green sheets containing finer ceramic powder.
- thin ceramic green sheets it is very important to improve the performance such as mechanical strength and elasticity.
- the film forming property of the ceramic paste at the time of producing a ceramic green sheet is also required.
- the peelability from the support of the ceramic green sheet is low. The mechanical strength and elasticity sufficient to withstand peeling may not be obtained, and as a result, the ceramic green sheet may be torn or abnormally stretched.
- the present invention provides a modified polyvinyl alcohol capable of producing a polyvinyl acetal having a low degree of polymerization and excellent solubility in a solvent with almost no reaction inhibition, coloring, or particle coarsening, and a method for producing the modified polyvinyl alcohol The purpose is to do.
- Another object of the present invention is to provide a modified polyvinyl acetal having a low degree of polymerization, excellent solubility in a solvent, and high elasticity, mechanical strength, and film forming property.
- the present invention provides a method for producing the modified polyvinyl acetal, a polyvinyl acetal film using the modified polyvinyl acetal, a method for producing the polyvinyl acetal film, a ceramic slurry composition, a method for producing the ceramic slurry composition, and a ceramic green sheet.
- the purpose is to do.
- the present invention has at least one functional group selected from the group consisting of a hydroxyl group, an aldehyde group, a carboxyl group and a lactone ring group at the molecular end, and has a saponification degree of 99.95 mol% or more, This is a modified polyvinyl alcohol in which the amount of 2-glycol bond is 1.4 mol% or less.
- the present invention is described in detail below.
- the present inventors used a modified polyvinyl alcohol having a specific structure at the molecular end and having a saponification degree and a 1,2-glycol bond content within a predetermined range as a raw material for polyvinyl acetal.
- the present inventors have found that a polyvinyl acetal having a low polymerization degree and excellent solubility in a solvent can be produced with little reaction inhibition, coloring, and particle coarsening, and the present invention has been completed.
- the modified polyvinyl alcohol of the present invention has at least one functional group selected from the group consisting of a hydroxyl group, an aldehyde group, a carboxyl group and a lactone ring group at the molecular end.
- a functional group selected from the group consisting of a hydroxyl group, an aldehyde group, a carboxyl group and a lactone ring group at the molecular end.
- the lower limit of the degree of saponification of the modified polyvinyl alcohol of the present invention is 99.95 mol%.
- the saponification degree is less than 99.95 mol%, the remaining acetyl group inhibits intermolecular interaction due to the hydroxyl group of polyvinyl alcohol, and thus the polyvinyl acetal cannot be adjusted to a desired viscosity when acetalized.
- the preferable lower limit of the degree of polymerization of the modified polyvinyl alcohol of the present invention is 80, and the preferable upper limit is 4000.
- the degree of polymerization of the modified polyvinyl alcohol is less than 80, the amount of 1,2-glycol bonds present in the raw material polyvinyl alcohol does not decrease any more, the adjustment of the degree of polymerization becomes difficult, and the coloring is remarkable. May be.
- the average degree of polymerization of the polyvinyl alcohol exceeds 4000, it may be difficult to industrially obtain the raw material polyvinyl alcohol due to the chain polymerization rate constant of vinyl acetate.
- a more preferred lower limit is 100, and a more preferred upper limit is 3000.
- the upper limit of the content of 1,2-glycol bonds is 1.4 mol%.
- the content of the 1,2-glycol bond exceeds 1.4 mol%, the remaining 1,2-glycol bond inhibits intermolecular interaction due to the hydroxyl group of polyvinyl alcohol.
- the acetal cannot be adjusted to the desired viscosity.
- the preferable lower limit of the content of 1,2-glycol bonds in the modified polyvinyl alcohol is 0.55 mol%, and the preferable upper limit is 1.2 mol%.
- the content of the 1,2-glycol bond can be confirmed by using, for example, 1 H- and 13 C-NMR.
- the modified polyvinyl alcohol of the present invention can be produced, for example, by a method having a step of reducing the degree of polymerization by bringing polyvinyl alcohol into contact with hydrogen peroxide in a basic solution.
- a method for producing such modified polyvinyl alcohol is also one aspect of the present invention.
- modified polyvinyl alcohol In the method for producing modified polyvinyl alcohol, the present inventors have reduced the degree of polymerization by bringing it into contact with hydrogen peroxide in a basic solution, thereby causing little reaction inhibition, coloring, and particle coarsening. The inventors have found that a modified polyvinyl alcohol capable of producing a polyvinyl acetal having a low degree of polymerization and excellent solubility in a solvent can be obtained, and the present invention has been completed.
- the method for producing a modified polyvinyl alcohol of the present invention includes a step of reducing the degree of polymerization by bringing polyvinyl alcohol into contact with hydrogen peroxide in a basic solution (hereinafter also referred to as a step of reducing the degree of polymerization).
- Polyvinyl alcohol used as a raw material is not particularly limited, but for example, vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl laurate, vinyl stearate, vinyl benzoate, etc.
- Conventionally known polyvinyl alcohols such as resins produced by alkali or acid saponification of polyvinyl esters obtained by polymerization by solution polymerization, bulk polymerization, suspension polymerization, emulsion polymerization, or the like can be used. .
- the polyvinyl alcohol may be completely saponified, but it need not be completely saponified if at least one unit having a double hydroxyl group with respect to the meso and racemic positions in at least one position of the main chain, Partially saponified polyvinyl alcohol may be used.
- a saponified product of a copolymer of a vinyl ester and a monomer that can be copolymerized with a vinyl ester such as an ethylene-vinyl alcohol copolymer or a partially saponified ethylene-vinyl alcohol copolymer may be used. it can.
- the preferable lower limit of the concentration of polyvinyl alcohol in the basic solution when the polyvinyl alcohol is brought into contact with hydrogen peroxide is 1% by weight, and the preferable upper limit is 25% by weight.
- the concentration of the polyvinyl alcohol in the basic solution in the low polymerization degree step is less than 1% by weight, the reaction efficiency at the time of acetalization in the subsequent step may be deteriorated. If the concentration of polyvinyl alcohol in the basic solution in the step of reducing the degree of polymerization exceeds 25% by weight, the viscosity of the solution becomes too high to be stirred, and the degree of polymerization cannot be reduced uniformly. There is.
- the more preferred lower limit of the concentration of polyvinyl alcohol in the basic solution in the low polymerization degree step is 3% by weight, the more preferred upper limit is 20% by weight, the still more preferred lower limit is 5% by weight, and the still more preferred upper limit is 17% by weight. .
- the preferable lower limit of the OH ⁇ ion concentration of the basic solution when the polyvinyl alcohol is brought into contact with hydrogen peroxide is 0.01 mol / L, and the preferable upper limit is 1 mol / L. If the OH ⁇ ion concentration of the basic solution is less than 0.01 mol / L, the degree of polymerization of polyvinyl alcohol does not progress, and the desired degree of polymerization of polyvinyl acetal may not be obtained. If the OH ⁇ ion concentration of the basic solution exceeds 1 mol / L, the polyvinyl acetal obtained in the subsequent step contains a large amount of ionic components, which adversely affects the solubility in the solvent and makes the system acidic in step 2.
- a more preferable lower limit of the OH ⁇ ion concentration of the basic solution is 0.1 mol / L, and a more preferable upper limit is 0.5 mol / L.
- the basic substance used in the basic solution is not particularly limited, and alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, and alkaline earth metal waters such as calcium hydroxide.
- alkali metal hydroxides such as sodium hydroxide and potassium hydroxide
- alkaline earth metal waters such as calcium hydroxide.
- Oxides, silicates such as sodium orthosilicate, sodium metasilicate, sodium sesquisilicate, No. 1 sodium silicate, No. 2 sodium silicate, No.
- sodium silicate sodium dihydrogen phosphate, disodium hydrogen phosphate, phosphoric acid Phosphate salts such as trisodium, carbonates such as sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate, borate salts such as sodium borate, inorganic nitrogen compounds such as ammonia and hydroxyamine, and water Primary amines, secondary amines, tertiary amines and quaternary amines having an alkyl group bonded to the tertiary amine, etc. Amine, and the like. Of these, alkali metal hydroxides and alkaline earth metal hydroxides are preferred, and sodium hydroxide and potassium hydroxide are more preferred.
- the said basic substance may be used independently and may combine 2 or more types.
- the solvent contained in the basic solution is not limited as long as it dissolves polyvinyl alcohol, but is acetalized in order to eliminate the need for solvent substitution when acetating the modified polyvinyl alcohol having a reduced degree of polymerization. It is preferable to use the same solvent as this solvent. Specifically, an aqueous solvent is preferably used.
- the addition amount of the hydrogen peroxide can be changed according to the degree of polymerization of the target polyvinyl acetal, but the preferable upper limit of the hydrogen peroxide concentration (maximum concentration of hydrogen peroxide) in the basic solution is 0.1 mol / L.
- the hydrogen peroxide concentration in the basic solution exceeds 0.1 mol / L, hydrogen peroxide generates oxygen, and bubbles formed by the surface active function of polyvinyl alcohol may remain for a long time. May result in undissolved polyvinyl alcohol, and the resulting polyvinyl acetal may have poor solubility in a solvent.
- the hydrogen peroxide concentration in the basic solution exceeds 0.1 mol / L, the acetalization does not progress uniformly in the subsequent step, and the degree of acetalization and the size of the precipitated particles are varied, resulting in the obtained polyvinyl Acetal may be poor in solubility in a solvent.
- a more preferable upper limit of the hydrogen peroxide concentration in the basic solution is 0.05 mol / L.
- the hydrogen peroxide may be added all at once in the initial stage of the reaction, may be added in portions as the reaction proceeds, or may be added while dropping continuously.
- the concentration of the hydrogen peroxide concentration in the basic solution exceeds 0.1 mol / L when batch addition is performed, the concentration of the hydrogen peroxide concentration is reduced to 0.1 mol / L or less by divided addition or continuous dropwise addition. can do.
- the preferable lower limit of the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide is 30 ° C., and the preferable upper limit is 100 ° C. If the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide is less than 30 ° C., it may take a long time to reduce the degree of polymerization of the polyvinyl alcohol. When the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide exceeds 100 ° C., the solvent is volatilized and undissolved polyvinyl acetal is generated in the subsequent acetalization step, and the resulting polyvinyl acetal is dissolved in the solvent. May have adverse effects on sex. A more preferable lower limit of the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide is 40 ° C., and a more preferable upper limit is 95 ° C.
- the time for contacting the polyvinyl alcohol with hydrogen peroxide can be changed depending on the degree of polymerization of the target polyvinyl acetal.
- a modified polyvinyl alcohol having a reduced degree of polymerization can be obtained in the process.
- the modified polyvinyl acetal of the present invention has at least one functional group selected from the group consisting of a hydroxyl group, an aldehyde group, a carboxyl group and a lactone ring group at the molecular end, and has a saponification degree of 99.95 mol%.
- the modified polyvinyl alcohol having a 1,2-glycol bond content of 1.4 mol% or less is acetalized.
- the modified polyvinyl acetal of the present invention is described in detail below.
- the present inventors have provided a modified polyvinyl acetal obtained by acetalizing a modified polyvinyl alcohol having a specific structure at the molecular terminal and having a saponification degree and a 1,2-glycol bond content within a predetermined range. Since no reaction inhibition occurs, it has been found that it has a low degree of polymerization and excellent solubility in a solvent with little coloration or coarsening of particles. Moreover, it has been found that such a modified polyvinyl acetal can provide a green sheet having high elasticity and mechanical strength while having excellent film forming properties, and has completed the present invention.
- the modified polyvinyl alcohol has at least one functional group selected from the group consisting of a hydroxyl group, an aldehyde group, a carboxyl group, and a lactone ring group at the molecular end.
- the lower limit of the saponification degree of the modified polyvinyl alcohol is 99.95 mol%. If the degree of saponification is less than 99.95 mol%, the remaining acetyl group inhibits intermolecular interaction due to the hydroxyl group of polyvinyl alcohol, and thus a polyvinyl acetal having a desired viscosity may not be obtained in acetalization. is there.
- the preferable lower limit of the polymerization degree of the modified polyvinyl alcohol is 80, and the preferable upper limit is 4000. If the degree of polymerization of the modified polyvinyl alcohol is less than 80, acetalization may be difficult. If the degree of polymerization of the polyvinyl alcohol exceeds 4000, it may not be synthesized industrially due to a chain transfer reaction depending on the existing polymerization method. A more preferred lower limit is 100, and a more preferred upper limit is 3000.
- the upper limit of the content of 1,2-glycol bonds is 1.4 mol%.
- the content of the 1,2-glycol bond exceeds 1.4 mol%, the remaining 1,2-glycol bond inhibits intermolecular interaction due to the hydroxyl group of polyvinyl alcohol. May not be obtained.
- the preferable lower limit of the content of 1,2-glycol bonds in the modified polyvinyl alcohol is 0.55 mol%, and the preferable upper limit is 1.3 mol%. A more preferred upper limit is 1.2 mol%.
- the content of the 1,2-glycol bond can be confirmed by using, for example, 1 H- and 13 C-NMR.
- the modified polyvinyl acetal of the present invention is obtained by acetalizing the modified polyvinyl alcohol.
- this acetalization is also referred to as an acetalization step.
- the acetalization step include a method in which the modified polyvinyl alcohol is reacted with an aldehyde to acetal in a system that is in an acidic condition using an acid catalyst.
- a conventionally known method can be used as a method for obtaining a modified polyvinyl acetal by reacting the modified polyvinyl alcohol with an aldehyde to obtain an acetal.
- modified polyvinyl butyral an aqueous solution containing 1 to 25% by weight of polyvinyl alcohol having a degree of polymerization reduced by hydrogen peroxide is prepared, and an acid catalyst and butyraldehyde are added in a temperature range of ⁇ 5 to 60 ° C. The reaction is allowed to proceed for 20 minutes to 6 hours, and then the temperature is raised by 10 to 50 ° C. and further aged for 30 minutes to 5 hours to complete the reaction.
- the modified A method for washing polyvinyl butyral is mentioned.
- the acid catalyst is not particularly limited, hydrogen halide such as hydrochloric acid, mineral acid such as nitric acid and sulfuric acid, carboxylic acid such as formic acid, acetic acid and propionic acid, methanesulfonic acid, ethanesulfonic acid, benzenesulfonic acid, Examples thereof include sulfonic acids such as paratoluenesulfonic acid, phosphoric acid and the like. These acid catalysts may be used alone or in combination of two or more compounds. Of these, hydrochloric acid, nitric acid, and sulfuric acid are preferable, and hydrochloric acid is more preferable.
- aldehyde examples include linear, branched, cyclic saturated, cyclic unsaturated, or aromatic aldehydes having 1 to 19 carbon atoms. Specific examples include formaldehyde, acetaldehyde, propionyl aldehyde, n-butyraldehyde, isobutyraldehyde, tert-butyraldehyde, benzaldehyde, cyclohexyl aldehyde and the like.
- the aldehyde may be used alone or in combination of two or more.
- the aldehyde may be one obtained by substituting one or more hydrogen atoms with halogen or the like except formaldehyde.
- the degree of acetalization of the modified polyvinyl acetal of the present invention can be adjusted by appropriately changing the blending amount of the aldehyde with respect to the modified polyvinyl alcohol, but the preferable lower limit is 60 mol% and the preferable upper limit is 75 mol%. .
- the degree of acetalization is less than 60 mol%, due to the effect of the remaining hydroxyl group, it may take time to dissolve at the time of dissolving the solvent, or many insoluble resins may be formed.
- the remaining aldehyde forms an intermolecular acetal, and the viscosity of each lot may not be stably produced.
- the preferable lower limit of the hydroxyl group content of the modified polyvinyl acetal of the present invention is 25 mol%, and the preferable upper limit is 40 mol%.
- the amount of the hydroxyl group is less than 25 mol%, the remaining aldehyde may form an intermolecular acetal and the viscosity of each lot may not be stably produced.
- the amount exceeds 40 mol% it takes time to dissolve when dissolving the solvent. Or a large number of insoluble resins may be formed.
- the modified polyvinyl acetal of the present invention uses, for example, Step 1 for producing modified polyvinyl alcohol by bringing polyvinyl alcohol into contact with hydrogen peroxide in a basic solution to reduce the degree of polymerization, and using an acid catalyst.
- Step 1 for producing modified polyvinyl alcohol by bringing polyvinyl alcohol into contact with hydrogen peroxide in a basic solution to reduce the degree of polymerization, and using an acid catalyst.
- it can be produced by a method having a step 2 in which the modified polyvinyl alcohol having a reduced degree of polymerization in the step 1 is reacted with an aldehyde to acetalize.
- a method for producing such a modified polyvinyl acetal is also one aspect of the present invention.
- the present inventors contact hydrogen peroxide in a basic solution as polyvinyl alcohol to be reacted with aldehyde. It has been found that by using a modified polyvinyl alcohol having a low degree of polymerization by the above, it is possible to produce a modified polyvinyl acetal having a low degree of polymerization and excellent solubility in a solvent with almost no reaction inhibition, coloring or coarsening of particles.
- the present invention has been completed.
- the manufacturing method of the modified polyvinyl acetal of this invention has the process 1 which produces modified polyvinyl alcohol by making polyvinyl alcohol contact with hydrogen peroxide in a basic solution, and making it low-polymerization degree.
- the polyvinyl alcohol is not particularly limited, for example, vinyl formate, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl isobutyrate, vinyl pivalate, vinyl laurate, vinyl stearate, vinyl benzoate, etc.
- Conventionally known polyvinyl alcohol such as a resin produced by alkali or acid saponification of a polyvinyl ester obtained by polymerization by a bulk polymerization method, a suspension polymerization method, an emulsion polymerization method or the like can be used.
- the polyvinyl alcohol may be completely saponified, but it need not be completely saponified if at least one unit having a double hydroxyl group with respect to the meso and racemic positions in at least one position of the main chain, Partially saponified polyvinyl alcohol may be used.
- a saponified product of a copolymer of a vinyl ester and a monomer that can be copolymerized with a vinyl ester such as an ethylene-vinyl alcohol copolymer or a partially saponified ethylene-vinyl alcohol copolymer may be used. it can.
- the minimum with a preferable polymerization degree of the said polyvinyl alcohol is 200, a preferable upper limit is 4000, a more preferable minimum is 300, and a more preferable upper limit is 3000.
- the preferable lower limit of the concentration of polyvinyl alcohol in the basic solution when the polyvinyl alcohol is brought into contact with hydrogen peroxide is 1% by weight, and the preferable upper limit is 25% by weight.
- the concentration of the polyvinyl alcohol in the basic solution in Step 1 is less than 1% by weight, the reaction efficiency when acetalizing the obtained polyvinyl alcohol in Step 2 may be deteriorated. If the concentration of the polyvinyl alcohol in the basic solution in Step 1 exceeds 25% by weight, the viscosity of the solution becomes so high that it is difficult to stir and the degree of polymerization cannot be uniformly reduced.
- a more preferred lower limit of the concentration of polyvinyl alcohol in the basic solution in Step 1 is 3% by weight, a more preferred upper limit is 20% by weight, a still more preferred lower limit is 5% by weight, and a still more preferred upper limit is 17% by weight.
- OH basic solution upon contacting the polyvinyl alcohol with hydrogen peroxide - lower limit of the ion concentration is 0.01 mol / L
- the upper limit is preferably 1 mol / L. If the OH ⁇ ion concentration of the basic solution is less than 0.01 mol / L, the degree of polymerization of polyvinyl alcohol does not progress, and the desired degree of polymerization of polyvinyl acetal may not be obtained.
- the polyvinyl acetal obtained in Step 2 contains a large amount of ionic components, which adversely affects the solubility in the solvent.
- a more preferable lower limit of the OH ⁇ ion concentration of the basic solution is 0.1 mol / L, and a more preferable upper limit is 0.5 mol / L.
- the basic substance used in the basic solution is not particularly limited, and alkali metal hydroxides such as sodium hydroxide and potassium hydroxide, alkaline earth metal hydroxides such as calcium hydroxide, Sodium silicates such as sodium orthosilicate, sodium metasilicate, sodium sesquisilicate, No. 1 sodium silicate, No. 2 sodium silicate, No. 3 sodium silicate, sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, etc.
- alkali metal hydroxides such as sodium hydroxide and potassium hydroxide
- alkaline earth metal hydroxides such as calcium hydroxide
- Sodium silicates such as sodium orthosilicate, sodium metasilicate, sodium sesquisilicate, No. 1 sodium silicate, No. 2 sodium silicate, No. 3 sodium silicate, sodium dihydrogen phosphate, disodium hydrogen phosphate, trisodium phosphate, etc.
- Phosphates carbonates such as sodium carbonate, sodium hydrogen carbonate, potassium carbonate, potassium hydrogen carbonate, borate salts such as sodium borate, inorganic nitrogen compounds such as ammonia and hydroxyamine, A primary amine, a secondary amine, a tertiary amine, and a quaternary amine in which an alkyl group is bonded to the tertiary amine or the like. And the like.
- alkali metal hydroxides and alkaline earth metal hydroxides are preferred, and sodium hydroxide and potassium hydroxide are more preferred.
- the said basic substance may be used independently and may combine 2 or more types.
- the solvent contained in the basic solution is not particularly limited as long as it dissolves polyvinyl alcohol. However, in order to eliminate the need for solvent substitution when the obtained modified polyvinyl alcohol having a reduced polymerization degree is acetalized in Step 2. It is preferable to use the same solvent as the acetalization solvent. Specifically, an aqueous solvent is preferably used.
- the amount of hydrogen peroxide added can be changed according to the degree of polymerization of the target modified polyvinyl acetal, but the preferable upper limit of the hydrogen peroxide concentration (the maximum concentration of hydrogen peroxide) in the basic solution is 0.5 mol. / L.
- the hydrogen peroxide concentration in the basic solution exceeds 0.5 mol / L, hydrogen peroxide generates oxygen, and bubbles formed by the surface active function of polyvinyl alcohol may remain for a long time. May result in undissolved polyvinyl alcohol, and the modified polyvinyl acetal obtained in step 2 may have poor solubility in a solvent.
- the hydrogen peroxide concentration in the basic solution exceeds 0.5 mol / L, the acetalization in Step 2 does not proceed uniformly, and the degree of acetalization and the size of the precipitated particles vary, resulting in the modified polyvinyl alcohol obtained.
- Acetal may be poor in solubility in a solvent.
- a more preferable upper limit of the hydrogen peroxide concentration in the basic solution is 0.3 mol / L.
- the hydrogen peroxide may be added all at once in the initial stage of the reaction, may be added in portions as the reaction proceeds, or may be added while dropping continuously.
- the concentration of the hydrogen peroxide concentration in the basic solution exceeds 0.5 mol / L when batch addition is performed, the concentration of the hydrogen peroxide concentration is reduced to 0.5 mol / L or less by divided addition or continuous dropwise addition. can do.
- a preferable lower limit of the temperature when the polyvinyl alcohol is brought into contact with the hydrogen peroxide is 30 ° C., and a preferable upper limit is 100 ° C. If the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide is less than 30 ° C., it may take a long time to reduce the degree of polymerization of the polyvinyl alcohol. When the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide exceeds 100 ° C., the solvent volatilizes and undissolved polyvinyl acetal is generated in Step 2, and the solubility of the resulting polyvinyl acetal in the solvent is adversely affected. May appear.
- a more preferable lower limit of the temperature at which the polyvinyl alcohol is brought into contact with the hydrogen peroxide is 40 ° C., and a more preferable upper limit is 95 ° C.
- Step 1 the time for which the polyvinyl alcohol is brought into contact with hydrogen peroxide can be changed depending on the polymerization degree of the target modified polyvinyl acetal. A modified polyvinyl alcohol having a reduced degree of polymerization can be obtained.
- the method for producing a modified polyvinyl acetal according to the present invention includes a step 2 in which a modified polyvinyl alcohol having a reduced degree of polymerization in the step 1 is reacted with an aldehyde to acetalize in a system that is in an acidic condition using an acid catalyst.
- a conventionally known method can be used as the method for obtaining a modified polyvinyl acetal by reacting the modified polyvinyl alcohol having a reduced degree of polymerization with an aldehyde in the step 2 to obtain an acetal.
- a conventionally known method can be used.
- modified polyvinyl butyral an aqueous solution containing 1 to 25% by weight of modified polyvinyl alcohol whose degree of polymerization has been lowered by hydrogen peroxide is prepared, and an acid catalyst and butyraldehyde are prepared at a temperature range of ⁇ 5 to 30 ° C.
- reaction is allowed to proceed for 20 minutes to 6 hours, and then the temperature is increased by 10 to 50 ° C., and the reaction is further aged for 30 minutes to 5 hours to complete the reaction, preferably after passing through a cooling step.
- a method for washing the modified polyvinyl butyral is exemplified.
- the hydrogen peroxide concentration in the system when the acid catalyst is used for the acidic condition is preferably 0.1 mol / L or less.
- the hydrogen peroxide concentration of the system in the acidic condition using an acid catalyst exceeds 0.1 mol / L, the hydrogen peroxide concentration does not decrease, acetalization is inhibited, and the resulting modified polyvinyl acetal
- the degree of acetalization may be low, or the shape of the generated polyvinyl acetal may not be obtained with powder and become coarse particles, which may not be sufficiently washed and dried, which may adversely affect quality.
- the hydrogen peroxide concentration of the system when the modified polyvinyl alcohol having a reduced polymerization degree is reacted with an aldehyde is preferably 0.1 mol / L or less.
- the acetalization is inhibited by forming an adduct with hydrogen peroxide before the modified polyvinyl alcohol and aldehyde react with each other.
- the degree of acetalization of the modified polyvinyl acetal may be low, or the shape of the generated polyvinyl acetal may not be obtained in a powder form and become coarse particles, which may not be sufficiently washed and dried, which may adversely affect quality.
- the hydrogen peroxide concentration of the system when the acid catalyst is used for acidic conditions, and the hydrogen peroxide concentration of the system when the modified polyvinyl alcohol having a reduced degree of polymerization is reacted with an aldehyde is 0.1 mol / L or less.
- hydrogen peroxide is consumed by lowering the degree of polymerization of polyvinyl alcohol by appropriately adjusting the amount of hydrogen peroxide added in step 1 above, the time of step 1 and the temperature of step 1 as appropriate. Accordingly, the conditions of step 1 may be set so that the concentration range is within the above range.
- a compound that promotes the decomposition of hydrogen peroxide is added to adjust the hydrogen peroxide concentration.
- the hydrogen peroxide concentration can be adjusted within the above range also by the method of adjusting the hydrogen peroxide concentration by adding a compound that causes a redox reaction with hydrogen peroxide.
- the compound that promotes the decomposition of hydrogen peroxide include manganese dioxide and catalase.
- the compound that causes an oxidation-reduction reaction with hydrogen peroxide include potassium permanganate and potassium dichromate.
- the temperature at the time of making a modified polyvinyl alcohol and an aldehyde contact is below the boiling point of the aldehyde to be used.
- the temperature at which the aldehyde is added exceeds the boiling point of the aldehyde, the aldehyde volatilizes during the addition, and the acetalization reaction may not proceed sufficiently.
- the temperature at which the modified polyvinyl alcohol and aldehyde are brought into contact with each other is preferably 5 to 70 ° C.
- the modified polyvinyl alcohol forms a gel and leads to the formation of an undissolved material.
- the typical aldehyde used in the process may volatilize, and the acetalization reaction may not proceed sufficiently. More preferably, it is 10 to 65 ° C.
- a polyvinyl acetal film is obtained by forming the modified polyvinyl acetal of the present invention into a film. Such a polyvinyl acetal film is also one aspect of the present invention.
- the polyvinyl acetal film of this invention can be used as a highly elastic polyvinyl acetal film because the minimum of the saponification degree of modified polyvinyl acetal is 99.95 mol%.
- the lower limit of the saponification degree of the modified polyvinyl acetal is less than 99.95 mol%, the effect of hydrogen bonding derived from the hydroxyl group between the modified polyvinyl acetals is lowered, and the bonding force between the molecular chains is reduced. , The elastic modulus decreases.
- the polyvinyl acetal film of the present invention can be made into a polyvinyl acetal film having excellent flexibility when the upper limit of the 1,2-glycol bond content of the modified polyvinyl acetal is 1.4 mol%. If the content of 1,2-glycol bond exceeds 1.4 mol%, the remaining 1,2-glycol bond reduces the effect of hydrogen bonds derived from hydroxyl groups between polyvinyl acetals, and bonds between molecular chains. The power is reduced. As a result, the elastic modulus when formed into a film is lowered. In the modified polyvinyl acetal, the preferable lower limit of the content of 1,2-glycol bonds is 0.55 mol%.
- the polyvinyl acetal film of this invention is manufactured by the method which has the process of heat-dissolving the modified polyvinyl acetal of this invention above 40 degreeC, for example.
- the temperature of the heating and melting is less than 40 ° C.
- the hydrogen bonds between the molecular chains are not sufficiently loosened, and an undissolved product is generated, resulting in a decrease in the maximum point stress of the sheet strength. is there.
- the temperature at the time of melting by heating to 40 ° C. or higher, a polyvinyl acetal film having excellent flexibility can be obtained.
- a ceramic slurry composition is obtained by adding a ceramic powder and an organic solvent to the modified polyvinyl acetal of the present invention.
- Such a ceramic slurry composition is also one aspect of the present invention.
- the ceramic slurry composition of the present invention contains a ceramic powder.
- the ceramic powder is not particularly limited, and examples thereof include barium titanate, alumina, zirconia, and glass powder.
- a preferable minimum is 50 weight% with respect to the sum total of the said resin component and the said ceramic powder, and a preferable upper limit is 99 weight%. . If it is less than 50% by weight, a ceramic green sheet having sufficient sheet strength can be obtained, but the volume shrinkage of the sheet after degreasing firing may increase. Moreover, since it becomes easy to generate
- a more preferred lower limit is 80% by weight, a more preferred upper limit is 97% by weight, a still more preferred lower limit is 90% by weight, and a still more preferred upper limit is 95% by weight.
- the ceramic slurry composition of the present invention contains an organic solvent.
- the organic solvent is not particularly limited, and is not particularly limited as long as it can dissolve the polyvinyl acetal resin.
- ketones such as acetone, methyl ethyl ketone, dipropyl ketone, diisobutyl ketone, methanol, ethanol, isopropanol , Alcohols such as butanol, aromatic hydrocarbons such as toluene and xylene, methyl propionate, ethyl propionate, butyl propionate, methyl butanoate, ethyl butanoate, butyl butanoate, methyl pentanoate, ethyl pentanoate, Esters such as butyl pentanoate, methyl hexanoate, ethyl hexanoate, butyl hexanoate, 2-ethylhexyl acetate, 2-ethyl
- a dispersant an antioxidant, an ultraviolet absorber, a surfactant, a filler, etc. may be appropriately added to the ceramic slurry composition of the present invention.
- a small amount of resin may be added.
- the method for producing the ceramic slurry composition of the present invention is not particularly limited.
- the modified polyvinyl acetal resin, the ceramic powder, the organic solvent, and various additives to be added as necessary are ball mill, blender mill, 3
- the method of mixing using various mixers, such as a roll, is mentioned.
- the ceramic slurry composition of this invention it is preferable to perform the process which heat-dissolves modified polyvinyl acetal at 40 degreeC or more in the process of adding and mixing modified polyvinyl acetal resin.
- a ceramic slurry composition having excellent film forming properties can be obtained.
- a ceramic green sheet using the ceramic slurry composition of the present invention is also one aspect of the present invention.
- a ceramic slurry composition is coated on a release-treated polyester film so that the thickness after drying is appropriate and air-dried at room temperature for 1 hour. Subsequently, it is made to dry at 80 degreeC for 3 hours using a hot air dryer. Subsequently, it is dried at 120 ° C. for 2 hours. Then, in order to harden the said curable resin, the method of heating ultraviolet irradiation and / or the ceramic green sheet itself etc. are mentioned.
- the modified polyvinyl alcohol which can manufacture the polyvinyl acetal which is excellent in the solubility to a solvent with a low degree of polymerization hardly causing reaction inhibition, coloring, and particle coarsening can be provided. Moreover, according to this invention, the manufacturing method of this modified polyvinyl alcohol can be provided. Further, according to the present invention, it is possible to provide a modified polyvinyl acetal having a low degree of polymerization, excellent solubility in a solvent, and high elasticity, mechanical strength, and film forming property.
- the present invention also provides a method for producing the modified polyvinyl acetal, a polyvinyl acetal film using the modified polyvinyl acetal, a method for producing the polyvinyl acetal film, a ceramic slurry composition, a method for producing the ceramic slurry composition, and a ceramic green sheet. can do.
- Example 1 (Preparation of aqueous polyvinyl alcohol solution) A polyvinyl alcohol aqueous solution was obtained by heating and stirring 100 g of polyvinyl alcohol (saponification degree 99%, polymerization degree 1700) and ion-exchanged water 865 g in a 2 L separable flask at 95 ° C. for 1 hour at 150 rpm.
- Example 2 A modified polyvinyl alcohol was obtained in the same manner as in Example 1 except that the addition amount of the aqueous sodium hydroxide solution and the hydrogen peroxide solution was changed as shown in Table 1 in (Modification step) of Example 1.
- Example 1 A modified polyvinyl alcohol was obtained in the same manner as in Example 1 except that the aqueous sodium hydroxide solution was not added, only the hydrogen peroxide solution was added, and the mixture was heated at 60 ° C. for 2 hours. It was.
- Example 2 A modified polyvinyl alcohol was obtained in the same manner as in Example 1 except that in Example 1 (modification step), no hydrogen peroxide solution was added, only an aqueous sodium hydroxide solution was added, and the mixture was heated at 60 ° C. for 2 hours. It was.
- polyvinyl acetal (polyvinyl butyral) To a solution of polyvinyl alcohol obtained in Examples and Comparative Examples, 130 g of 25 wt% hydrochloric acid and 58 g of butyraldehyde were added and acetalized for 180 minutes. Thereafter, the temperature was raised to 40 ° C. over 60 minutes, and the reaction was further continued at that temperature for 120 minutes. After cooling to room temperature, the precipitated resin was collected by filtration, and the resin content was washed with ion-exchanged water. Next, the obtained resin was washed with an aqueous sodium carbonate solution, then washed again with water and dried to obtain polyvinyl butyral. The obtained polyvinyl butyral was subjected to the following evaluations (3-1) to (3-4).
- Resin particle diameter 0.1% by weight of a surfactant (manufactured by Kao Corporation: Emar) was added to a 4% by weight resin suspension of the obtained polyvinyl butyral, and the mixture was ultrasonically cleaned for 10 minutes.
- the average particle size was measured using a particle size distribution system (LA950V2 manufactured by Horiba, Ltd.) to obtain a resin particle size.
- Example 4 Preparation of aqueous polyvinyl alcohol solution
- a polyvinyl alcohol aqueous solution was obtained by heating and stirring 100 g of polyvinyl alcohol (saponification degree 99%, polymerization degree 1700) and ion-exchanged water 865 g in a 2 L separable flask at 95 ° C. for 1 hour at 150 rpm.
- Example 5 In Example 4 (acetalization step), a modified polyvinyl butyral was obtained in the same manner as in Example 4 except that the temperature when adding butyraldehyde was changed to 60 ° C.
- Example 6 In Example 4 (acetalization step), a modified polyvinyl butyral was obtained in the same manner as in Example 4 except that the temperature when adding butyraldehyde was changed to 15 ° C.
- Example 7 modified polyvinyl butyral was obtained in the same manner as in Example 4 except that the temperature when adding butyraldehyde was changed to 5 ° C.
- Comparative Example 3 A polyvinyl alcohol aqueous solution was obtained in the same manner as in Comparative Example 1. About the obtained polyvinyl alcohol aqueous solution, polyvinyl butyral was obtained by performing by the method similar to Example 4 (acetalization process).
- Comparative Example 4 In the (acetalization step) of Comparative Example 3, polyvinyl butyral was obtained in the same manner as in Example 4 except that the temperature when adding butyraldehyde was changed to 15 ° C.
- Comparative Example 6 In the (acetalization step) of Comparative Example 5, polyvinyl butyral was obtained in the same manner as in Example 4 except that the temperature when adding butyraldehyde was changed to 15 ° C.
- Example 8 Polyvinyl butyral was obtained in the same manner as in Example 4 except that hydrogen peroxide and sodium hydroxide were added so as to achieve the concentrations shown in Table 2.
- Example 9 In Example 8 (acetalization step), polyvinyl butyral was obtained in the same manner as in Example 4 except that the temperature when adding butyraldehyde was changed to 15 ° C.
- Solvent solubility 15 g of the obtained polyvinyl butyral was added to 135 g of a mixed solvent of ethanol and toluene (weight mixing ratio: 1: 1), shaken at room temperature for 2 hours, and then statically observed. “ ⁇ ” when there is no resin not dissolved in the solvent, “ ⁇ ” when there is a slight amount of resin not dissolved in the solvent, and “X” when there are many resins not dissolved in the solvent. As evaluated.
- Example 10 (Preparation of polyvinyl acetal film) 8 parts by weight of the modified polyvinyl acetal resin obtained in Example 4 was added to a mixed solvent of 50 parts by weight of toluene and 50 parts by weight of ethanol, and stirred and dissolved while heating at 50 ° C. The obtained resin solution was coated on a PET film subjected to a release treatment so that the thickness after drying was 20 ⁇ m using a coater. After air drying at room temperature for 10 minutes, the film was peeled from the PET film to obtain a polyvinyl acetal film.
- the obtained ceramic slurry composition was coated on a PET film that had been subjected to a release treatment so that the thickness after drying was 2 ⁇ m using a coater, air-dried at room temperature for 10 minutes, and then heated at 80 ° C. for 30 minutes. Thus, a ceramic green sheet was obtained.
- Example 11 A polyvinyl acetal film, a ceramic slurry composition and a ceramic green sheet were produced in the same manner as in Example 10 except that the modified polyvinyl acetal obtained in Examples 5 to 7 was used.
- Comparative Example 7 (Preparation of polyvinyl acetal film, ceramic slurry composition and ceramic green sheet) A polyvinyl acetal film, a ceramic slurry composition, and a ceramic green sheet were produced in the same manner as in Example 10 except that the polyvinyl butyral obtained in Comparative Example 3 was used.
- Comparative Example 9 (Preparation of polyvinyl acetal film, ceramic slurry composition and ceramic green sheet) A polyvinyl acetal film, a ceramic slurry composition, and a ceramic green sheet were produced in the same manner as in Example 10 except that the polyvinyl butyral obtained in Comparative Example 5 was used.
- Example 10 A polyvinyl acetal was obtained in the same manner as in Example 10 except that the modified polyvinyl acetal resin obtained in Comparative Example 5 was used and the temperature at which it was dissolved in (Preparation of a polyvinyl acetal film) and (Preparation of a ceramic slurry composition) was 15 ° C. A film, a ceramic slurry composition, and a ceramic green sheet were prepared.
- Comparative Example 11 (Preparation of polyvinyl acetal film, ceramic slurry composition and ceramic green sheet) A polyvinyl acetal film, a ceramic slurry composition, and a ceramic green sheet were produced in the same manner as in Example 10 except that the polyvinyl butyral obtained in Comparative Example 6 was used.
- Comparative Example 12 Using the modified polyvinyl acetal resin obtained in Comparative Example 6, and using the modified polyvinyl acetal resin in the same manner as in Example 10 except that the temperature for dissolution in (Preparation of polyvinyl acetal film) and (Preparation of ceramic slurry composition) was 15 ° C. A film, a ceramic slurry composition, and a ceramic green sheet were prepared.
- a modified polyvinyl alcohol capable of producing a polyvinyl acetal having a low degree of polymerization and excellent solubility in a solvent with almost no reaction inhibition, coloring or particle coarsening, and a method for producing the modified polyvinyl alcohol.
- a modified polyvinyl acetal having a low degree of polymerization, excellent solubility in a solvent, and high elasticity, mechanical strength, and film forming property.
- the present invention also provides a method for producing the modified polyvinyl acetal, a polyvinyl acetal film using the modified polyvinyl acetal, a method for producing the polyvinyl acetal film, a ceramic slurry composition, a method for producing the ceramic slurry composition, and a ceramic green sheet. can do.
- the modified polyvinyl acetal of the present invention can be used in various fields such as ceramic binders, ink paints and silver salt films.
Abstract
Description
また、本発明は、低重合度で溶剤への溶解性に優れ、高い弾性、機械的強度及び製膜性を有する変性ポリビニルアセタールに関する。
更に、本発明は、該変性ポリビニルアセタールの製造方法及び該変性ポリビニルアセタールを用いたポリビニルアセタールフィルム、ポリビニルアセタールフィルムの製造方法、セラミックスラリー組成物、セラミックスラリー組成物の製造方法及びセラミックグリーンシートに関する。
低重合度のポリビニルアルコールを得る方法として、特許文献2には酢酸ビニルの重合に鎖移動定数の高い溶剤を用いる方法が開示されており、特許文献3には連鎖移動剤を重合開始前及び重合中に供給しながら酢酸ビニルの重合を行う方法が開示されている。しかしながら、これらの方法では、けん化する際に溶剤を置換する必要があったり、残留した連鎖移動剤を回収する必要があったりするといった製造上の問題や、精製したポリビニルアルコールが着色したり、溶剤への溶解性に劣るものとなったりするという品質上の問題があった。また、特許文献4には、ポリビニルアルコールを過酸化水素等の酸化剤を用いて主鎖開裂し、還元処理して低重合度化する方法が開示されている。しかしながら、特許文献4に開示されている方法で低重合度化したポリビニルアルコールは、アセタール化後に得られるポリビニルアセタールが、反応阻害によりアセタール化度の低いものとなったり、ポリビニルアセタール粒子が粗大化したりするという問題があった。
薄層のセラミックグリーンシートにおいては、機械的強度、弾性等の性能を向上させることが非常に重要となる。また、セラミックグリーンシートを作製する際のセラミックペーストの製膜性も必要となる。
しかしながら、例えば、製膜性を向上させるために、アセタール化度が高いポリビニルアセタール樹脂、又は、平均重合度の低いポリビニルアセタール樹脂を用いた場合には、セラミックグリーンシートの支持体からの剥離性が低下したり、剥離に耐えうるだけの機械的強度や弾性が得られなかったりすることがあり、結果として、セラミックグリーンシートが破れてしまったり、異常に伸びてしまったりすることがあった。
また、本発明は、低重合度で溶剤への溶解性に優れ、高い弾性、機械的強度及び製膜性を有する変性ポリビニルアセタールを提供することを目的とする。更に、本発明は、該変性ポリビニルアセタールの製造方法及び該変性ポリビニルアセタールを用いたポリビニルアセタールフィルム、ポリビニルアセタールフィルムの製造方法、セラミックスラリー組成物、セラミックスラリー組成物の製造方法及びセラミックグリーンシートを提供することを目的とする。
以下に本発明を詳述する。
分子末端にこのような官能基を有することにより、末端の極性が変化し、従来のポリビニルアルコールと比較して、水への溶解性の向上、界面活性効果の向上が期待される。なお、分子末端に上述の官能基を有することは、例えば、1H-及び13C-NMR等を用いることで確認することができる。
上記ケン化度が99.95モル%未満であると、残存するアセチル基がポリビニルアルコールの水酸基による分子間相互作用を阻害するため、アセタール化する際に、ポリビニルアセタールを所望の粘度に調整できない。
より好ましい下限は100、より好ましい上限は3000である。
上記ポリビニルアルコールは、完全けん化されていてもよいが、少なくとも主鎖の1カ所にメソ、ラセミ位に対して2連の水酸基を有するユニットが最低1ユニットあれば完全けん化されている必要はなく、部分けん化ポリビニルアルコールであってもよい。また、上記ポリビニルアルコールとしては、エチレン-ビニルアルコール共重合体、部分けん化エチレン-ビニルアルコール共重合体等のビニルエステルと共重合可能なモノマーとビニルエステルとの共重合体のけん化物も用いることができる。
以下に本発明の変性ポリビニルアセタールを詳述する。
また、このような変性ポリビニルアセタールは、優れた製膜性を有しつつ、高い弾性、機械的強度を有するグリーンシートが得られることを見出し、本発明を完成させるに至った。
分子末端にこのような官能基を有することにより、極性の変化により、アセタール化における溶液の溶解性や、溶液の糸切れ性が向上する等の効果がある。なお、分子末端に上述の官能基を有することは、例えば、1H-及び13C-NMR等を用いることで確認することができる。
上記ケン化度が99.95モル%未満であると、残存するアセチル基がポリビニルアルコールの水酸基による分子間相互作用を阻害するため、アセタール化において、所望の粘度のポリビニルアセタールが得られないことがある。
なお、上記1,2-グリコール結合の含有量は、例えば、1H-及び13C-NMR等を用いることで確認することができる。
上記アセタール化工程としては、例えば、酸触媒を用いて酸性条件にした系において、上記変性ポリビニルアルコールをアルデヒドと反応させてアセタールする方法等が挙げられる。
上記ポリビニルアルコールは、完全けん化されていてもよいが、少なくとも主鎖の1カ所にメソ、ラセミ位に対して2連の水酸基を有するユニットが最低1ユニットあれば完全けん化されている必要はなく、部分けん化ポリビニルアルコールであってもよい。また、上記ポリビニルアルコールとしては、エチレン-ビニルアルコール共重合体、部分けん化エチレン-ビニルアルコール共重合体等のビニルエステルと共重合可能なモノマーとビニルエステルとの共重合体のけん化物も用いることができる。
なお、上記ポリビニルアルコールの重合度の好ましい下限は200、好ましい上限は4000であり、より好ましい下限は300、より好ましい上限は3000である。
上記過酸化水素の分解を促進する化合物としては、二酸化マンガンやカタラーゼ等が挙げられ、上記過酸化水素と酸化還元反応を起こす化合物としては、過マンガン酸カリウムや重クロム酸カリウム等が挙げられる。
上記温度範囲とすることで、原料であるポリビニルアルコールの重合度に依存せず、溶液の粘度を制御することが可能となる。
上記アルデヒドを添加する際の温度がアルデヒドの沸点を超えると、アルデヒドが添加時に揮発し、アセタール化反応が充分に進行しないことがある。
具体的には、上記変性ポリビニルアルコールとアルデヒドとを接触させる際の温度を5~70℃とすることが好ましい。5℃未満であると、変性ポリビニルアルコールがゲルを形成し、未溶解物の形成につながった結果、バインダーとしたときの製膜性を悪化させることがあり、70℃を超えると、ポリビニルアセタール合成に使用される代表的なアルデヒドが揮発してしまい、充分にアセタール化反応が進行しないことがある。より好ましくは10~65℃である。
上記変性ポリビニルアセタールのケン化度の下限が99.95モル%未満であると、変性ポリビニルアセタール間の水酸基に由来する水素結合の効果が低下し、分子鎖間の結合力が小さくなり、その結果、弾性率が低下する。
また、上記変性ポリビニルアセタールは、1,2-グリコール結合の含有量の好ましい下限が0.55モル%である。上記1,2-グリコール結合の含有量が0.55モル%未満であると、分子鎖同士が充分にほぐれず、溶解性が低下する。その結果、未溶解物が生成し、シート強度の最大点応力の低下につながることがある。
上記加熱溶解する際の温度を40℃以上とすることで、柔軟性に優れるポリビニルアセタールフィルムとすることができる。
上記セラミック粉末としては特に限定されず、例えば、チタン酸バリウム、アルミナ、ジルコニア、ガラス粉末等が挙げられる。
より好ましい下限は80重量%、より好ましい上限は97重量%であり、更に好ましい下限は90重量%、更に好ましい上限は95重量%である。
上記有機溶剤としては特に限定されず、例えば、上記ポリビニルアセタール樹脂を溶解できるものであれば特に限定されず、例えば、アセトン、メチルエチルケトン、ジプロピルケトン、ジイソブチルケトン等のケトン類、メタノール、エタノール、イソプロパノール、ブタノール等のアルコール類、トルエン、キシレン等の芳香族炭化水素類、プロピオン酸メチル、プロピオン酸エチル、プロピオン酸ブチル、ブタン酸メチル、ブタン酸エチル、ブタン酸ブチル、ペンタン酸メチル、ペンタン酸エチル、ペンタン酸ブチル、ヘキサン酸メチル、ヘキサン酸エチル、ヘキサン酸ブチル、酢酸2-エチルヘキシル、酪酸2-エチルヘキシル等のエステル類、メチルセルソルブ、エチルセルソルブ、ブチルセルソルブ、テルピネオール、ジヒドロテルピネオール、ブチルセルソルブアセテート、ブチルカルビトールアセテート、テルピネオールアセテート、ジヒドロテルピネオールアセテート等が挙げられる。特に、アルコール類、ケトン類、芳香族炭化水素類及びこれらの混合溶剤が塗工性、乾燥性の面から見て好ましい。
上記加熱溶解する際の温度を40℃以上とすることで、製膜性に優れるセラミックスラリー組成物とすることができる。
本発明のセラミックグリーンシートの製造方法としては、例えば、セラミックスラリー組成物を、離型処理したポリエステルフィルム上に、乾燥後の厚みが適当になるように塗工し常温で1時間風乾する。次いで熱風乾燥機を用いて80℃で3時間乾燥させる。続いて120℃で2時間乾燥させる。次いで上記硬化性樹脂を硬化させるために紫外線照射及び/又はセラミックグリーンシート自体を加熱する方法等が挙げられる。
また、本発明によれば、低重合度で溶剤への溶解性に優れ、高い弾性、機械的強度及び製膜性を有する変性ポリビニルアセタールを提供することができる。また、本発明は、該変性ポリビニルアセタールの製造方法及び該変性ポリビニルアセタールを用いたポリビニルアセタールフィルム、ポリビニルアセタールフィルムの製造方法、セラミックスラリー組成物、セラミックスラリー組成物の製造方法及びセラミックグリーンシートを提供することができる。
(ポリビニルアルコール水溶液の調製)
ポリビニルアルコール(ケン化度99%、重合度1700)100g、イオン交換水865gを2Lのセパラブルフラスコにて95℃で1時間、150rpmで加熱攪拌することで、ポリビニルアルコール水溶液を得た。
次いで、攪拌したまま温度を60℃とした後、20重量%の水酸化ナトリウム水溶液を投入して液中のOH-イオン濃度を0.1mol/Lとした。次いで、30重量%濃度の過酸化水素水5.6gを添加し、溶液中の過酸化水素濃度を0.025mol/Lとした。過酸化水素の添加終了後、さらに2時間反応させ、変性ポリビニルアルコールを得た。
実施例1の(変性工程)において、水酸化ナトリウム水溶液、過酸化水素水の添加量を表1に示すように変更した以外は、実施例1と同様にして、変性ポリビニルアルコールを得た。
実施例1の(変性工程)において、水酸化ナトリウム水溶液を添加せず、過酸化水素水のみを添加し、60℃で2時間加熱した以外は実施例1と同様にして、変性ポリビニルアルコールを得た。
実施例1の(変性工程)において、過酸化水素水を添加せず、水酸化ナトリウム水溶液のみを添加し、60℃で2時間加熱した以外は実施例1と同様にして、変性ポリビニルアルコールを得た。
実施例及び比較例で製造した変性ポリビニルアルコールについて、以下の評価を行った。結果を表1に示した。
エタノール25gに得られたポリビニルアルコール2gを加え、次いで、塩酸ヒドロキシルアミン15gをイオン交換水100gに溶解した溶液10mlと塩酸5mlとを加え、沸騰水浴中で3時間加熱した。冷却後、アンモニア水で中和してからメタノールを加えて樹脂を析出させ、更にメタノールで洗浄してから乾燥させた樹脂を水100gに加熱溶解させた。得られた溶液に対してJIS K6726に準拠して重合度を測定した。
得られたポリビニルアルコールの溶液を5重量%に希釈した後、5倍量の体積のアセトン中に再沈殿し、析出させた。析出させたポリビニルアルコールを回収した後、80℃、4時間で乾燥し、DMSO-d6に溶解させた。得られたポリビニルアルコール溶液について、1H-及び13C-NMR(日本電子社製、JNM-AL)を用いて、ケン化度及び1,2-グリコール結合の含有量を測定した。また、ポリビニルアルコールの分子末端の構造について解析した。
実施例及び比較例で得られたポリビニルアルコールの溶液に、25重量%の塩酸130gとブチルアルデヒド58gとを添加し180分間アセタール化反応させた。その後、60分かけて40℃にまで昇温し、その温度で更に120分反応させ、室温にまで冷却した後に析出した樹脂を濾過により回収し、樹脂分をイオン交換水で洗浄した。次いで、得られた樹脂を炭酸ナトリウム水溶液で洗浄した後、再度水洗し、乾燥させてポリビニルブチラールを得た。得られたポリビニルブチラールについて、以下の(3-1)~(3-4)の評価を行った。
得られたポリビニルブチラール10mgを重水素化ジメチルスルホキシド1.0gに溶解し、1H-NMR測定によりブチラール化度を測定した。
得られたポリビニルブチラールの4重量%の樹脂懸濁液に、0.1重量%の界面活性剤(花王社製:エマール)を加え、10分間超音波洗浄機により分散させ、粒度分布系(堀場製作所社製 LA950V2)を用いて平均粒子径を測定し樹脂粒子径とした。
得られたポリビニルブチラールの着色を目視にて評価した。白色である場合を「○」、わずかに黄変が見られる場合を「△」、黄又は茶色に着色している場合を「×」として評価した。
得られたポリビニルブチラール15gをエタノールとトルエンの混合溶剤(重量混合比1:1)135gに加え、室温にて2時間振とうした後に静止し、目視により観察した。溶剤に溶解していない樹脂が全く無い場合を「○」、溶剤に溶解していない樹脂がわずかに見られる場合を「△」、溶剤に溶解していない樹脂が多数存在する場合を「×」として評価した。
(ポリビニルアルコール水溶液の調製)
ポリビニルアルコール(ケン化度99%、重合度1700)100g、イオン交換水865gを2Lのセパラブルフラスコにて95℃で1時間、150rpmで加熱攪拌することで、ポリビニルアルコール水溶液を得た。
次いで、攪拌したまま温度を60℃とした後、20重量%の水酸化ナトリウム水溶液を投入して液中のOH-イオン濃度を0.1mol/Lとした。次いで、30重量%濃度の過酸化水素水5.6gを添加し、溶液中の過酸化水素濃度を0.05mol/Lとした。過酸化水素の添加終了後、さらに2時間反応させ、変性ポリビニルアルコールを含有する溶液を得た。
変性ポリビニルアルコールを含有する溶液を70℃に加熱した後、25重量%の塩酸130gとブチルアルデヒド58gとを添加し、徐々に3℃まで冷却しながら180分間アセタール化反応させた。その後、60分かけて40℃にまで昇温し、その温度で更に120分反応させ、室温にまで冷却した後に析出した樹脂を濾過により回収し、樹脂分をイオン交換水で洗浄した。次いで、得られた樹脂を炭酸ナトリウム水溶液で洗浄した後、再度水洗し、乾燥させて変性ポリビニルブチラールを得た。
実施例4の(アセタール化工程)において、ブチルアルデヒドを添加する際の温度を60℃に変更した以外は、実施例4と同様にして変性ポリビニルブチラールを得た。
実施例4の(アセタール化工程)において、ブチルアルデヒドを添加する際の温度を15℃に変更した以外は実施例4と同様にして変性ポリビニルブチラールを得た。
実施例4の(アセタール化工程)において、ブチルアルデヒドを添加する際の温度を5℃に変更した以外は実施例4と同様にして変性ポリビニルブチラールを得た。
比較例1と同様の方法でポリビニルアルコール水溶液を得た。
得られたポリビニルアルコール水溶液について、実施例4と同様の方法で(アセタール化工程)を行うことでポリビニルブチラールを得た。
比較例3の(アセタール化工程)において、ブチルアルデヒドを添加する際の温度を15℃に変更した以外は、実施例4と同様にしてポリビニルブチラールを得た。
(ポリビニルアルコール水溶液の調製)
ポリビニルアルコール(ケン化度98.2%、重合度500)100g、イオン交換水865gを2Lのセパラブルフラスコにて95℃で1時間、150rpmで加熱攪拌することで、ポリビニルアルコール水溶液を得た。
ポリビニルアルコールを含有する溶液を70℃に加熱した後、25重量%の塩酸130gとブチルアルデヒド55gとを60度の温度において添加し、冷却しながら180分間アセタール化反応させた。その後、60分かけて40℃にまで昇温し、その温度で更に120分反応させ、室温にまで冷却した後に析出した樹脂を濾過により回収し、樹脂分をイオン交換水で洗浄した。次いで、得られた樹脂を炭酸ナトリウム水溶液で洗浄した後、再度水洗し、乾燥させてポリビニルブチラールを得た。
比較例5の(アセタール化工程)において、ブチルアルデヒドを添加する際の温度を15℃に変更した以外は、実施例4と同様にしてポリビニルブチラールを得た。
表2に記載の濃度となるように、過酸化水素及び水酸化ナトリウムを添加した以外は、実施例4と同様にしてポリビニルブチラールを得た。
実施例8の(アセタール化工程)において、ブチルアルデヒドを添加する際の温度を15℃に変更した以外は、実施例4と同様にしてポリビニルブチラールを得た。
実施例4~9及び比較例3~6で使用したポリビニルアルコール、並びに、実施例4~9及び比較例3~6で製造したポリビニルブチラールについて、以下の評価を行った。結果を表2に示した。
実施例及び比較例で使用したポリビニルアルコールの溶液を5重量%に希釈した後、5倍量の体積のアセトン中に再沈殿し、析出させた。析出させたポリビニルアルコールを回収した後、80℃、4時間で乾燥し、DMSO-d6に溶解させた。得られたポリビニルアルコール溶液について、1H-及び13C-NMR(日本電子社製、JNM-AL)を用いて、ケン化度及び1,2-グリコール結合の含有量を測定した。また、ポリビニルアルコールの分子末端の構造について解析した。
エタノール25gに得られたポリビニルブチラール2gを加え、次いで、塩酸ヒドロキシルアミン15gをイオン交換水100gに溶解した溶液10mlと塩酸5mlとを加え、沸騰水浴中で3時間加熱した。冷却後、アンモニア水で中和してからメタノールを加えて樹脂を析出させ、更にメタノールで洗浄してから乾燥させた樹脂を水100gに加熱溶解させた。得られた溶液に対してJIS K 6726に準拠して重合度を測定した。
得られたポリビニルブチラール10mgを重水素化ジメチルスルホキシド1.0gに溶解し、1H-NMR測定によりブチラール化度を測定した。
得られたポリビニルブチラールをエタノールとトルエンとの1:1混合溶剤に溶解した10重量%溶液について、B型粘度計(Brookfield社製 DV-II+Pro)を用いて溶液温度20℃、10~120rpmの条件で溶液粘度を測定した。
得られたポリビニルブチラールの粒子形状を目開き1mmのふるいにかけて評価した。ほぼ全ての樹脂がふるいから落下した場合を「○」、半分程度落下した場合を「△」、ほとんど落下しなかった場合を「×」として評価した。
得られたポリビニルブチラールの着色を目視にて評価した。白色である場合を「○」、わずかに黄変が見られる場合を「△」、黄又は茶色に着色している場合を「×」として評価した。
得られたポリビニルブチラール15gをエタノールとトルエンの混合溶剤(重量混合比1:1)135gに加え、室温にて2時間振とうした後に静止し、目視により観察した。溶剤に溶解していない樹脂が全く無い場合を「○」、溶剤に溶解していない樹脂がわずかに見られる場合を「△」、溶剤に溶解していない樹脂が多数存在する場合を「×」として評価した。
(ポリビニルアセタールフィルムの作製)
実施例4で得られた変性ポリビニルアセタール樹脂8重量部を、トルエン50重量部とエタノール50重量部との混合溶剤に加え、50℃で加熱しながら攪拌溶解した。得られた樹脂溶液をコーターを用いて乾燥後の厚みが20μmとなるように、離形処理したPETフィルム上に塗工した。常温で10分間風乾した後、PETフィルムから剥離し、ポリビニルアセタールフィルムを得た。
得られた変性ポリビニルアセタール樹脂8重量部を、トルエン50重量部とエタノール50重量部との混合溶剤に加え、50℃で加熱しながら攪拌溶解し、可塑剤としてジブチルフタレート4重量部を加え、攪拌溶解した。得られた樹脂溶液に、セラミック粉末としてチタン酸バリウム(BT-03、平均粒径0.3μm、堺化学工業社製)100重量部を加え、ボールミルで48時間混合してセラミックスラリー組成物を得た。
得られたセラミックスラリー組成物を、コーターを用いて乾燥後の厚みが2μmとなるように離形処理したPETフィルム上に塗工し、常温で10分間風乾した後、80℃で30分間加熱することで、セラミックグリーンシートを得た。
実施例5~7で得られた変性ポリビニルアセタールを用いた以外は実施例10と同様にしてポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
実施例4~7で得られた変性ポリビニルアセタール樹脂を用い、(ポリビニルアセタールフィルムの作製)及び(セラミックスラリー組成物の作製)において溶解する温度を15℃とした以外は実施例10と同様にしてポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
(ポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートの作製)
比較例3で得られたポリビニルブチラールを用いた以外は、実施例10と同様にして、ポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
比較例3で得られた変性ポリビニルアセタール樹脂を用い、(ポリビニルアセタールフィルムの作製)及び(セラミックスラリー組成物の作製)において溶解する温度を15℃とした以外は実施例10と同様にしてポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
(ポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートの作製)
比較例5で得られたポリビニルブチラールを用いた以外は、実施例10と同様にして、ポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
比較例5で得られた変性ポリビニルアセタール樹脂を用い、(ポリビニルアセタールフィルムの作製)及び(セラミックスラリー組成物の作製)において溶解する温度を15℃とした以外は実施例10と同様にしてポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
(ポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートの作製)
比較例6で得られたポリビニルブチラールを用いた以外は、実施例10と同様にして、ポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
比較例6で得られた変性ポリビニルアセタール樹脂を用い、(ポリビニルアセタールフィルムの作製)及び(セラミックスラリー組成物の作製)において溶解する温度を15℃とした以外は実施例10と同様にしてポリビニルアセタールフィルム、セラミックスラリー組成物及びセラミックグリーンシートを作製した。
JIS K 7113に準拠した方法により、TENSILON(ORIENTEC社製)を用いて、ポリビニルアセタールフィルムの引張弾性率、最大点応力、破断点伸度を測定した。
なお、試験片としては、長さ50mm×幅20mmのものを使用し、試験速度は50mm/分で行った。
得られたセラミックグリーンシートの表面を、顕微鏡を用いて観測することで、セラミックスラリー組成物の製膜性を評価した。
平滑なセラミックグリーンシートを形成されており、未溶解物等は観測されなかった場合を「○」、セラミックグリーンシートの表面に多数の未溶解物が観測された場合を「×」とした。
JIS K 7113に準拠した方法により、TENSILON(ORIENTEC社製)を用いて、セラミックグリーンシート引張弾性率、最大点応力を測定した。
なお、試験片としては、長さ20mm×幅10mmのものを使用し、試験速度は50mm/分で行った。
また、本発明によれば、低重合度で溶剤への溶解性に優れ、高い弾性、機械的強度及び製膜性を有する変性ポリビニルアセタールを提供することができる。また、本発明は、該変性ポリビニルアセタールの製造方法及び該変性ポリビニルアセタールを用いたポリビニルアセタールフィルム、ポリビニルアセタールフィルムの製造方法、セラミックスラリー組成物、セラミックスラリー組成物の製造方法及びセラミックグリーンシートを提供することができる。
なお、本発明の変性ポリビニルアセタールは、セラミック用バインダー、インク塗料、銀塩フィルム等の種々の分野で使用することができる。
Claims (18)
- 分子末端に水酸基、アルデヒド基、カルボキシル基及びラクトン環基からなる群から選択される少なくとも1種の官能基を有し、かつ、ケン化度が99.95モル%以上、1,2-グリコール結合の含有量が1.4モル%以下である
ことを特徴とする変性ポリビニルアルコール。 - 請求項1記載の変性ポリビニルアルコールの製造方法であって、
塩基性溶液中にてポリビニルアルコールを過酸化水素と接触させて低重合度化する工程を有することを特徴とする変性ポリビニルアルコールの製造方法。 - 塩基性溶液のOH-イオン濃度が0.01~1mol/Lであることを特徴とする請求項2記載の変性ポリビニルアルコールの製造方法。
- ポリビニルアルコールの低重合度化は、ポリビニルアルコールの溶解とともに行うことを特徴とする請求項2又は3記載の変性ポリビニルアルコールの製造方法。
- ポリビニルアルコールを過酸化水素と接触させる際の塩基性溶液中の過酸化水素濃度が0.1mol/Lを超えないことを特徴とする請求項2、3又は4記載の変性ポリビニルアルコールの製造方法。
- 分子末端に水酸基、アルデヒド基、カルボキシル基及びラクトン環基からなる群から選択される少なくとも1種の官能基を有し、かつ、ケン化度が99.95モル%以上、1,2-グリコール結合の含有量が1.4モル%以下である変性ポリビニルアルコールをアセタール化してなることを特徴とする変性ポリビニルアセタール。
- 請求項6記載の変性ポリビニルアセタールの製造方法であって、
塩基性溶液中にてポリビニルアルコールを過酸化水素と接触させて低重合度化することで、変性ポリビニルアルコールを作製する工程1、及び、
酸触媒を用いて酸性条件にした系において、前記工程1で低重合度化した変性ポリビニルアルコールをアルデヒドと反応させてアセタール化する工程2を有する
ことを特徴とする変性ポリビニルアセタールの製造方法。 - 塩基性溶液のOH-イオン濃度が0.01~1mol/Lであることを特徴とする請求項7記載の変性ポリビニルアセタールの製造方法。
- 工程1において、ポリビニルアルコールの低重合度化は、ポリビニルアルコールの溶解とともに行うことを特徴とする請求項7又は8記載の変性ポリビニルアセタールの製造方法。
- 工程1において、ポリビニルアルコールを過酸化水素と接触させる際の塩基性溶液中の過酸化水素濃度が0.5mol/Lを超えないことを特徴とする請求項7、8又は9記載の変性ポリビニルアセタールの製造方法。
- 工程2において、酸触媒を用いて系を酸性条件にする際の系の過酸化水素濃度が0.1mol/L以下であることを特徴とする請求項7、8、9又は10記載の変性ポリビニルアセタールの製造方法。
- 工程2において、変性ポリビニルアルコールとアルデヒドとを接触させる際の系の過酸化水素濃度が0.1mol/L以下であることを特徴とする請求項7、8、9、10又は11記載の変性ポリビニルアセタールの製造方法。
- 工程2において、変性ポリビニルアルコールとアルデヒドとを接触させる際の温度を5~70℃とすることを特徴とする請求項7、8、9、10、11又は12記載の変性ポリビニルアセタールの製造方法。
- 請求項6記載の変性ポリビニルアセタールを用いてなることを特徴とするポリビニルアセタールフィルム。
- 請求項14記載のポリビニルアセタールフィルムの製造方法であって、請求項6記載の変性ポリビニルアセタールを40℃以上で加熱溶解する工程を有することを特徴とするポリビニルアセタールフィルムの製造方法。
- 請求項6記載の変性ポリビニルアセタール、セラミック粉末及び有機溶剤を含有することを特徴とするセラミックスラリー組成物。
- 請求項16記載のセラミックスラリー組成物の製造方法であって、請求項6記載の変性ポリビニルアセタールを40℃以上で加熱溶解する工程を有することを特徴とするセラミックスラリー組成物の製造方法。
- 請求項16記載のセラミックスラリー組成物を用いてなることを特徴とするセラミックグリーンシート。
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JPWO2018096937A1 (ja) * | 2016-11-24 | 2018-11-29 | デンカ株式会社 | 変性ビニルアルコール系重合体及びその製造方法 |
WO2018096937A1 (ja) * | 2016-11-24 | 2018-05-31 | デンカ株式会社 | 変性ビニルアルコール系重合体及びその製造方法 |
WO2019189625A1 (ja) * | 2018-03-30 | 2019-10-03 | 積水化学工業株式会社 | ポリ塩化ビニル懸濁重合用分散剤として用いるポリビニルアルコール、該ポリビニルアルコールを含む分散剤、及び該ポリビニルアルコールを用いたポリ塩化ビニルの製造方法 |
CN111918885A (zh) * | 2018-03-30 | 2020-11-10 | 积水化学工业株式会社 | 用作聚氯乙烯悬浮聚合用分散剂的聚乙烯醇、包含该聚乙烯醇的分散剂及使用了该聚乙烯醇的聚氯乙烯的制造方法 |
JPWO2019189625A1 (ja) * | 2018-03-30 | 2021-06-24 | 積水化学工業株式会社 | ポリ塩化ビニル懸濁重合用分散剤として用いるポリビニルアルコール、該ポリビニルアルコールを含む分散剤、及び該ポリビニルアルコールを用いたポリ塩化ビニルの製造方法 |
JP7023350B2 (ja) | 2018-03-30 | 2022-02-21 | 積水化学工業株式会社 | ポリ塩化ビニル懸濁重合用分散剤として用いるポリビニルアルコール、該ポリビニルアルコールを含む分散剤、及び該ポリビニルアルコールを用いたポリ塩化ビニルの製造方法 |
CN111918885B (zh) * | 2018-03-30 | 2023-06-06 | 积水化学工业株式会社 | 用作聚氯乙烯悬浮聚合用分散剂的聚乙烯醇、包含该聚乙烯醇的分散剂及使用了该聚乙烯醇的聚氯乙烯的制造方法 |
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TWI522371B (zh) | 2016-02-21 |
JP5555718B2 (ja) | 2014-07-23 |
JPWO2012043280A1 (ja) | 2014-02-06 |
EP2623524B1 (en) | 2017-01-11 |
EP2623524A4 (en) | 2014-07-16 |
KR101902025B1 (ko) | 2018-09-27 |
KR20130099115A (ko) | 2013-09-05 |
EP2623524A1 (en) | 2013-08-07 |
CN103124748B (zh) | 2014-10-29 |
CN103124748A (zh) | 2013-05-29 |
TW201223969A (en) | 2012-06-16 |
US20130197154A1 (en) | 2013-08-01 |
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