WO2017209037A1 - ピッチコントロール剤およびピッチコントロール方法 - Google Patents
ピッチコントロール剤およびピッチコントロール方法 Download PDFInfo
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- WO2017209037A1 WO2017209037A1 PCT/JP2017/019879 JP2017019879W WO2017209037A1 WO 2017209037 A1 WO2017209037 A1 WO 2017209037A1 JP 2017019879 W JP2017019879 W JP 2017019879W WO 2017209037 A1 WO2017209037 A1 WO 2017209037A1
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- WIPO (PCT)
- Prior art keywords
- pitch control
- pitch
- meth
- control agent
- acrylamide
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/008—Prevention of corrosion or formation of deposits on pulp-treating equipment
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
- D21C9/086—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching with organic compounds or compositions comprising organic compounds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
- D21H17/375—Poly(meth)acrylamide
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
- D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
- D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
- D21H17/45—Nitrogen-containing groups
- D21H17/455—Nitrogen-containing groups comprising tertiary amine or being at least partially quaternised
Definitions
- the present invention relates to a pitch control agent for suppressing a pitch failure in a pulp and paper manufacturing process, and a pitch control method using the same.
- the paper manufacturing process is roughly divided into a pre-process for producing pulp from wood and waste paper (pulp forming process) and a post-process for obtaining sheet-like paper from pulp (paper making process).
- pulping process after the wood chips are cooked under strong alkali, the pulp is bleached with chlorine, hypochlorite, chlorine dioxide, oxygen, ozone, etc. to improve the whiteness. Done. Thereafter, the soil containing the decomposition products generated during bleaching is washed and removed by alkali extraction, and bleached pulp is obtained.
- the pulp is spread into a sheet shape by the wire part, and then dewatering by the press part and drying by the dryer part are performed.
- Wood the raw material for paper, contains fats and oils, fatty acids, terpenes, steroids, natural resins, gum-like substances, etc., and these substances are also in the micron order in the pulp obtained in the pulping process. It remains as a colloid. Those that are agglomerated and enlarged are called "pitch".
- a pitch-causing substance (micropitch) is adsorbed on a porous inorganic material such as talc or clay, and is made into paper and discharged out of the system.
- a porous inorganic material such as talc or clay
- these porous inorganic substances do not have sufficient micropitch adsorptive power and have low fixability on paper, which causes white water contamination and sludge accumulation.
- the porous inorganic substance can cause wear and damage of the papermaking wire.
- Patent Document 1 and Patent Document 2 disclose a method of adding a predetermined amphoteric polymer as a pitch control agent to a pulp slurry in a papermaking process of waste paper pulp.
- the amphoteric polymers described in Patent Document 1 and Patent Document 2 are pitch control agents mainly used in the papermaking process of waste paper pulp, and are mainly used in a neutral or acidic environment. Even if these amphoteric polymers are applied to a pulping process for producing pulp from wood chips, sufficient pitch controllability cannot be exhibited. Specifically, when a conventional polymer pitch control agent is used in a high pH environment such as a pulping process or when the pH is lowered from a high pH environment, the dispersibility of micropitch and the pulp The fixing property is low, and the applicable pH range is limited.
- an object of the present invention is to provide a pitch control agent that is hardly affected by the surrounding environment and has high pitch controllability in both the pulping process and the papermaking process. Furthermore, this invention aims at provision of the pitch control method using the said pitch control agent.
- the dispersibility of the pitch-causing substances in water and the fixability to pulp vary greatly depending on the surrounding environment, particularly from alkaline to neutral or acidic. It has been found that when the environment changes, the dispersibility is remarkably lowered and the pitch is likely to aggregate. As a result of further investigation focusing on such characteristics, by using an acrylamide amphoteric polymer having a predetermined monomer composition as a pitch control agent, even when the pH fluctuates greatly, the micropitch dispersibility and the pulp The present inventors have found that the fixing property can be maintained, and have reached the present invention.
- the pitch control agent of the present invention contains a (meth) acrylamide amphoteric polymer.
- the (meth) acrylamide-based amphoteric polymer contains 50 mol% or more (meth) acrylamide, 0.5 to 20 mol% diallyldialkylammonium salt, and 0.1 to 14 mol% anionic monomer as a copolymerization monomer component. Containing.
- anionic monomer ⁇ , ⁇ -unsaturated carboxylic acid or a salt thereof is preferably used, and among them, ⁇ , ⁇ -unsaturated dicarboxylic acid or a salt thereof is preferable, ⁇ , ⁇ -unsaturated dicarboxylic acid and ⁇ , ⁇ -It is particularly preferred to use in combination with an unsaturated monocarboxylic acid. Itaconic acid is preferred as the ⁇ , ⁇ -unsaturated dicarboxylic acid, and acrylic acid is preferred as the ⁇ , ⁇ -unsaturated monocarboxylic acid.
- the content of the diallyldialkylammonium salt (cationic monomer) in the copolymerization monomer component is preferably larger than the content of the anionic monomer.
- the content of diallyldialkylammonium salt is particularly preferably 1.4 or more in charge ratio with respect to the content of anionic monomer.
- a pitch control agent containing the (meth) acrylamide amphoteric polymer By adding a pitch control agent containing the (meth) acrylamide amphoteric polymer to the pulp slurry, the dispersibility of the micropitch and the fixability to the pulp can be improved.
- a pitch control agent is added to a pulp slurry having a pH of 9 or more.
- the addition of the pitch control agent is performed, for example, in a pulping process.
- the pitch control agent of the present invention can be dispersed in a micro pitch even when used in a high pH environment such as a pulping process or when the pH is lowered from a high pH environment (when a pH shock is applied). Maintains fixability to paper and pulp. Therefore, it has high pitch controllability not only in the paper making process but also in the pulping process.
- the pitch control agent of the present invention contains a (meth) acrylamide amphoteric polymer.
- the (meth) acrylamide amphoteric polymer has a (meth) acrylamide unit as a main skeleton, and contains a (meth) acrylamide unit, a cationic monomer unit, and an anionic monomer unit as a copolymerization monomer component.
- “(meth) acryl” means acryl and / or methacryl.
- the (meth) acrylamide amphoteric polymer is obtained by copolymerizing (meth) acrylamide, a cationic monomer and an anionic monomer.
- (meth) acrylamide examples include acrylamide and methacrylamide.
- (meth) acrylamide either acrylamide or methacrylamide may be used, or both may be used in combination.
- acrylamide is used alone.
- the amount of (meth) acrylamide used is 50 mol% or more, preferably 70 to 98 mol%, more preferably 75 to 97 mol%, based on the total amount of copolymerization monomer components constituting the (meth) acrylamide amphoteric polymer. More preferably, it is 80 to 95 mol%.
- the (meth) acrylamide amphoteric polymer contains a diallyldialkylammonium salt represented by the following formula as a cationic monomer component.
- R 2 and R 3 are each independently an alkyl group having 1 to 6 carbon atoms which may have a branch. Of these, diallyldimethylammonium salts in which R 2 and R 3 are both methyl groups are preferably used.
- X ⁇ include halogen anions such as fluorine, chlorine, bromine and iodine, and organic anions such as methyl sulfate anion (CH 3 O 4 S ⁇ ).
- X ⁇ is preferably a halogen anion. That is, the (meth) acrylamide amphoteric polymer preferably contains a diallyldimethylammonium halide such as diallyldimethylammonium chloride (DADMAC) as the cationic monomer component.
- DADMAC diallyldimethylammonium chloride
- a quaternary ammonium salt such as DADMAC has a function of neutralizing the negative charge of micropitch because it retains cationicity even under high pH conditions, and is
- the amount of diallyldialkylammonium salt used is 0.5 to 20 mol%, preferably 1 to 15 mol%, more preferably 2 to 2 mol%, based on the total amount of copolymerization monomer components constituting the (meth) acrylamide amphoteric polymer. It is 12 mol%, more preferably 3 to 10 mol%.
- the (meth) acrylamide amphoteric polymer contains an anionic monomer component.
- an anionic monomer component an acid monomer having an unsaturated double bond and an acidic group and salts thereof are preferably used.
- the acidic group include carboxylic acid and sulfonic acid.
- the salt of the acid monomer include sodium salt, potassium salt, ammonium salt and the like.
- Examples of the sulfonic acid monomer having an unsaturated double bond include vinyl sulfonic acid, styrene sulfonic acid, 2-acrylamido-2-methylpropane sulfonic acid, and salts thereof.
- Examples of the carboxylic acid monomer having a vinyl group include ⁇ , ⁇ -unsaturated carboxylic acids and salts thereof.
- ⁇ -unsaturated carboxylic acid As ⁇ , ⁇ -unsaturated carboxylic acid, ⁇ , ⁇ -unsaturated monocarboxylic acid such as (meth) acrylic acid and crotonic acid which are monovalent anionic monomers; and maleic acid which is divalent anionic monomer
- ⁇ , ⁇ -unsaturated dicarboxylic acids such as fumaric acid, itaconic acid, mesaconic acid and citraconic acid.
- anionic monomers may be used alone or in combination of two or more, or anionic monomers having different valences may be used in combination.
- the (meth) acrylamide amphoteric polymer preferably contains an ⁇ , ⁇ -unsaturated carboxylic acid as an anionic monomer component.
- ⁇ , ⁇ -unsaturated dicarboxylic acid is preferably contained, and both ⁇ , ⁇ -unsaturated dicarboxylic acid and ⁇ , ⁇ -unsaturated monocarboxylic acid are more preferably contained.
- Itaconic acid is particularly preferable as the ⁇ , ⁇ -unsaturated dicarboxylic acid
- acrylic acid is particularly preferable as the ⁇ , ⁇ -unsaturated monocarboxylic acid.
- the amount of the anionic monomer used is 0.1 to 14 mol%, preferably 0.5 to 10 mol%, more preferably 1 with respect to the total amount of copolymerization monomer components constituting the (meth) acrylamide amphoteric polymer. ⁇ 5 mol%.
- the (meth) acrylamide amphoteric polymer may contain monomer components other than those described above.
- Other monomer components include alkyl (meth) acrylate, hydroxyalkyl (meth) acrylate, diacetone acrylamide, styrene, ⁇ -methylstyrene, polyalkylene glycol (meth) acrylate, glycerol mono (meth) acrylate, vinyl pyrrolidone, vinyl Monofunctional monomers such as oxazoline, vinyl acetate, acryloylmorpholine, acrylonitrile; divinylbenzene, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, allyl (meth) acrylate, tri ( (Meth) acrylic acid pentaerythritol, trimethylolpropane (meth) acrylate, triacryl formal, triallyl iso
- the amount of these other monomer components used is 30 mol% or less, preferably 10 mol% or less, more preferably 5 mol% or less, based on the total amount of copolymerization monomer components constituting the (meth) acrylamide amphoteric polymer. is there.
- the (meth) acrylamide amphoteric polymer is represented, for example, by the following general formula (I).
- R 1 is a hydrogen atom or a methyl group.
- R 2 and R 3 are each independently an alkyl group having 1 to 6 carbon atoms which may have a branch, and preferably R 2 and R 3 are both methyl groups.
- X ⁇ is any anion, preferably a halide ion.
- R 4 is an arbitrary nonionic group or anionic group, preferably a hydrogen atom, an optionally branched alkyl group having 1 to 6 carbon atoms, or an optionally branched carbon.
- k, m, and n are the contents of (meth) acrylamide unit, cationic monomer unit (diallyldialkylammonium unit), and anionic monomer unit ( ⁇ , ⁇ -unsaturated carboxylic acid unit), respectively (total amount of monomer unit) Mol%).
- k + m + n is preferably 70 or more, more preferably 90 or more, and still more preferably 95 or more.
- K is 50 or more, preferably 70 to 98, more preferably 75 to 97, and still more preferably 80 to 95.
- m is 0.5 to 20, preferably 1 to 15, more preferably 2 to 12, and still more preferably 3 to 10.
- n is 0.1 to 14, preferably 0.5 to 10, and more preferably 1 to 5.
- the content m of the cationic monomer unit is preferably larger than the content n of the anionic monomer unit, and m is preferably at least twice as large as n.
- m + n is preferably 1 to 30, more preferably 2 to 25, and still more preferably 5 to 20.
- the content of diallyldialkylammonium salt which is a cationic monomer unit is preferably 1.4 times or more in terms of charge ratio with respect to the content of anionic monomer unit.
- the anionic monomer unit is a monovalent anion such as acrylic acid
- m is preferably 1.4 times or more of n.
- the anionic monomer unit is a divalent anion such as itaconic acid
- m is preferably at least 2.8 times n.
- the positive charge amount of the cationic monomer unit depends on the valence of the ions of each monomer unit.
- the upper limit of the charge ratio of the content of the cationic monomer unit to the content of the anionic monomer unit is not particularly limited, but is preferably 20 or less, and more preferably 10 or less.
- a (meth) acrylamide amphoteric polymer with a monomer component content within the above range as a pitch control agent, it is possible to disperse the micropitch and suppress agglomeration due to aggregation, and fix the micropitch to the pulp together with the polymer. Can be discharged out of the system.
- the content ratio of the monomer component is within the above range, it is not easily affected by changes in the surrounding environment such as pH and electrical conductivity, and exhibits excellent pitch controllability in both the pulping process and the papermaking process. it can.
- the arrangement of monomer components in the (meth) acrylamide amphoteric polymer may be random or block.
- the weight average molecular weight of the (meth) acrylamide amphoteric polymer is, for example, about 100,000 to 20 million, preferably 500,000 to 15 million, and more preferably 1 million to 10 million.
- the arrangement and weight average molecular weight of the monomer component in the polymer can be controlled by the type of the monomer component, the amount of the polymerization initiator or chain transfer agent used, the reaction conditions, and the like.
- a (meth) acrylamide amphoteric polymer is obtained.
- the polymerization method is not particularly limited, and various polymerization methods such as thermal polymerization and photopolymerization can be applied.
- a copolymer is obtained by charging a monomer and a solvent into a reaction vessel together with a polymerization initiator, a chain transfer agent, and the like as necessary, and allowing the polymerization to proceed by heating.
- the monomer components may be added all at once or dividedly in a plurality of times. Moreover, you may advance a polymerization reaction, dripping a polymerization initiator or a part or all of a chain transfer agent in a reaction container.
- the solvent is not particularly limited as long as it can dissolve the monomer component; water; ketones such as acetone and methyl ethyl ketone; alcohols such as methanol, ethanol, propanol, isopropanol, and butanol; ethylene glycol monoethyl ether, propylene glycol monomethyl Examples include glycol ethers such as ether; ester ethers such as propylene glycol monomethyl ether acetate, and the like. Among these, water is preferable. When tap water is used as the polymerization solvent, the metal may be removed using a chelating agent such as EDTA. The amount of solvent used may be adjusted so that the polymer concentration in the polymerization solution is about 10 to 50% by mass.
- thermal radical generators such as peroxide compounds, azo compounds, sulfides, sulfines, sulfinic acids and the like are preferable, and peroxide compounds are particularly preferable.
- the peroxide compound may be used as a redox polymerization initiator in combination with a reducing agent.
- peroxide compounds include organic peroxides and inorganic peroxides. Of these, persulfates such as sodium persulfate, potassium persulfate, and ammonium persulfate are preferable.
- the blending amount of the polymerization initiator is preferably 0.01 to 10 parts by mass, and more preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the total monomer components.
- the chain transfer agent has an action of receiving radicals from the growing polymer chain and stopping the extension of the polymer, and the chain transfer agent receiving the radicals attacks the monomer to start polymerization again.
- a chain transfer agent By using a chain transfer agent, an increase in the molecular weight of the polymer can be suppressed without reducing the radical concentration in the reaction system.
- the molecular weight distribution (Mw / Mn) tends to be small, and a polymer having excellent solubility and fluidity in a solvent even with a high molecular weight can be obtained.
- Chain transfer agents include (meth) allyl compounds, mercaptoethanol, thiourea, thioglycolic acid, mercaptopropionic acid, thiosalicylic acid, thiolactic acid, aminoethanethiol, thioglycerol, thiomalic acid and other mercaptos, isopropyl alcohol, etc. Is mentioned.
- the blending amount of the chain transfer agent is preferably 0.01 to 10 parts by mass with respect to 100 parts by mass of the total monomer components.
- Polymerization conditions vary depending on the types of monomer components, polymerization initiator, solvent, etc., but are preferably 30 to 110 ° C., more preferably 50 to 100 ° C.
- the polymerization time is, for example, 0.5 to 24 hours, and preferably 1 to 12 hours.
- the polymerization reaction may be stopped by adding a reducing agent such as sodium sulfite to the reaction system.
- the polymerized solution may be subjected to polymer purification, removal of unreacted monomers, concentration adjustment, or the like, if necessary, and may be used as it is as a pitch control agent.
- the pitch control agent is preferably provided in the form of a (meth) acrylamide amphoteric polymer solution.
- the solvent for the pitch control agent the same solvents as those exemplified as the polymerization solvent can be used. Since the pitch control agent is added to the pulp slurry and used, water is particularly preferable as the solvent.
- a (meth) acrylamide amphoteric polymer may be synthesized in water, and the resulting aqueous solution of the polymer may be used as it is as a pitch control agent.
- pitch control agents include pH adjusters, surfactants, viscosity adjusters, rust inhibitors, antioxidants, antistatic agents, antiseptics, antifoaming agents, etc.
- Optional components may be included.
- the polymer concentration in the pitch control agent is not particularly limited as long as the polymer can be dissolved in the solvent, and may be adjusted, for example, in the range of 1 to 50% by mass.
- pitch control method By adding the pitch control agent of the present invention (the (meth) acrylamide amphoteric polymer or a solution thereof) to the pulp slurry in the pulping process or papermaking process, pitch control (suppression of pitch failure) is performed.
- the location where the pitch control agent is added is not particularly limited, but it is preferable to add the pitch control agent to the pulp slurry at the location where the pitch failure occurs or upstream thereof.
- the addition amount of the pitch control agent may be appropriately determined according to the pulp raw material, the type of equipment, etc.
- the amount of the (meth) acrylamide amphoteric polymer with respect to 100 parts by mass of the pulp solid content is usually 0.001 to About 5 parts by mass, preferably about 0.005 to 1 part by mass.
- pitch control agent By adding a pit control agent to the pulp slurry, it is possible to disperse the micropitch and suppress the pitch failure due to aggregation.
- the reason why pitch aggregation can be prevented by the pitch control agent is that the negative charge of the micropitch is neutralized by the cationic group in the (meth) acrylamide amphoteric polymer.
- the (meth) acrylamide amphoteric polymer has an anionic group in addition to the cationic group, it can effectively neutralize the charge of various pitch-causing substances without depending on the pH environment. It is thought that it contributes to improvement of controllability.
- the content of the (meth) acrylamide component of the amphoteric polymer is large, a hydrophilic polyion complex is easily formed. It is thought that this polyion complex acts as a protective colloid that prevents aggregation of micropitch. Since the polyion complex is easily fixed (fixed) to the fiber surface of the pulp, the micropitch can be fixed to the pulp and discharged to the downstream side of the process together with the pulp. For this reason, the suppression of the increase in the micropitch concentration in the system is also considered to contribute to the suppression of pitch disturbance.
- Micropitch derived from wood such as fats and oils, fatty acids, terpenes, steroids, natural resins, gums, etc.
- a pitch control agent in an environment with high dispersibility of the micropitch, a protective colloid made of an amphoteric polymer is formed around the micropitch and the aggregation of the pitch is suppressed.
- the (meth) acrylamide amphoteric polymer contained in the pitch control agent of the present invention can maintain characteristics over a wide pH range. Therefore, once the protective colloid is formed by the pitch control agent, the protective colloid is maintained and the aggregation of the pitch is suppressed even when the environment changes to a low pitch dispersibility state due to pH shock or the like. Tend.
- the wood chips are cooked under strong alkaline conditions (generally about pH 10 to 13) with a pH of 9 or more, and a pulp slurry is obtained.
- strong alkaline conditions generally about pH 10 to 13
- a pulp slurry is obtained.
- the environment changes to neutral or acidic at pH 8.5 or less
- the dispersibility of the pitch is lowered, and thus pitch disturbance is more likely to occur.
- an alkaline environment with high pitch dispersibility for example, pH of 9 or more, preferably pH of 10 or more
- the micropitch dispersed in water is a protective colloid of amphoteric polymer. Covered.
- a pitch control agent to the pulp slurry under an alkaline environment such as a pulping step. Since the pitch control agent added in the pulping process is fixed to the pulp together with the micropitch, it is sent to the downstream side of the process together with the pulp slurry. Therefore, pitch control performance can be exhibited even downstream of the place where the pitch control agent is added.
- ammonium persulfate as a polymerization initiator was added until the viscosity reached about 10,000 mPa ⁇ s, and the reaction was continued at about 85 ° C. for 3 hours. Thereafter, sodium sulfite as a reducing agent and diluting water were added, and the reaction was stopped by cooling to obtain an aqueous solution of acrylamide polymer (solid content concentration: 21.9% by mass).
- Table 1 shows the composition of the pitch control agent (copolymerization monomer component) of each example and comparative example, the charge ratio of the cationic monomer content to the anionic monomer content, and the evaluation results.
- the pH in Table 1 is the pH when the pitch control agent was added, and for Example 2, Example 5 and Comparative Example 1, the results of the reference example with the pitch control agent added at pH 7 are also shown.
- each component is described by the following abbreviations.
- DADMAC diallyldimethylammonium chloride
- DMQ acryloyloxyethyltrimethylammonium chloride
- DMBC acryloyloxyethylbenzyldimethylammonium chloride
- AA acrylic acid IA: itaconic acid AM: acrylamide
- the polymer of Comparative Example 1 containing DADMAC, which is a cationic monomer, as a main component was added to a pH 7 pulp slurry (Reference Example)
- the dispersibility score was relatively good at 3, but the pH 11 pulp
- the polymer of Comparative Example 1 can be used as a pitch control agent in a neutral environment, but it can be used in a high pH environment such as a pulping process, or from an alkaline environment to a neutral or acidic environment. It turns out that it is not suitable for the use in the process in which pH change occurs.
- Comparative Example 2 having a large content of acrylic acid as an anionic monomer component, Comparative Example 3 not containing an anionic monomer component, Comparative Example 4 not containing a cationic monomer component, and comparison using different types of cationic monomers
- the polymer of Example 5 also had a dispersibility (five-step evaluation) score of 1 or 2 when the pH was lowered to 7 after being added to a pH 11 pulp slurry, and was inferior in pitch dispersibility.
- Examples 6 and 7 using acrylic acid which is an ⁇ , ⁇ -unsaturated monocarboxylic acid and itaconic acid which is an ⁇ , ⁇ -unsaturated dicarboxylic acid as an anionic monomer component are dispersibility and fixing. It was particularly excellent in properties and had high pitch control performance.
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Abstract
Description
本発明のピッチコントロール剤は、(メタ)アクリルアミド系両性ポリマーを含有する。(メタ)アクリルアミド系両性ポリマーは、(メタ)アクリルアミドユニットを主骨格とするものであり、共重合モノマー成分として、(メタ)アクリルアミドユニット、カチオン性モノマーユニット、およびアニオン性モノマーユニットを含有する。なお、本明細書において、「(メタ)アクリル」とは、アクリルおよび/またはメタクリルを意味する。(メタ)アクリルアミド系両性ポリマーは、(メタ)アクリルアミド、カチオン性モノマーおよびアニオン性モノマーを共重合することにより得られる。
(メタ)アクリルアミドとしては、アクリルアミドおよびメタクリルアミドが挙げられる。(メタ)アクリルアミドとして、アクリルアミドおよびメタクリルアミドのいずれか一方を用いてもよく、両者を併用してもよい。好ましくは、アクリルアミドが単独使用される。
(メタ)アクリルアミド系両性ポリマーは、カチオン性モノマー成分として、下記式で表されるジアリルジアルキルアンモニウム塩を含む。
(メタ)アクリルアミド系両性ポリマーは、アニオン性モノマー成分を含有する。アニオン性モノマー成分としては、不飽和二重結合と酸性基とを有する酸系モノマーおよびこれらの塩が好ましく用いられる。酸性基としては、カルボン酸、スルホン酸等が挙げられる。酸系モノマーの塩としては、ナトリウム塩、カリウム塩、アンモニウム塩等が挙げられる。
(メタ)アクリルアミド系両性ポリマーは、上記以外のモノマー成分を含んでいてもよい。他のモノマー成分としては、アルキル(メタ)アクリレート、ヒドロキシアルキル(メタ)アクリレート、ジアセトンアクリルアミド、スチレン、α‐メチルスチレン、ポリアルキレングリコール(メタ)アクリレート、グリセロールモノ(メタ)アクリレート、ビニルピロリドン、ビニルオキサゾリン、酢酸ビニル、アクリロイルモルホリン、アクリロニトリル等の単官能モノマー;ジビニルベンゼン、エチレングリコールジ(メタ)アクリレート、ジエチレングリコールジ(メタ)アクリレート、トリエチレングリコールジ(メタ)アクリレート、アリル(メタ)アクリレート、トリ(メタ)アクリル酸ペンタエリスリトール、トリメチロールプロバン(メタ)アクリレート、トリアクリルホルマール、トリアリルイソシアヌレート、テトラアリルオキシエタン、アルキレンビス(メタ)アクリルアミド、アリル(メタ)アクリルアミド、N‐置換アクリルアミド、ジ(メタ)アクリロイルイミド等の架橋性モノマー等が挙げられる。
(メタ)アクリルアミド系両性ポリマーは、例えば下記一般式(I)で表される。
上記のモノマー成分を共重合させることにより、(メタ)アクリルアミド系両性ポリマーが得られる。重合方法は特に限定されず、熱重合や光重合等の各種の重合法を適用できる。例えば、モノマーおよび溶媒を、必要に応じて重合開始剤や連鎖移動剤等とともに反応容器に仕込み、加熱により重合を進行させることにより、共重合体が得られる。モノマー成分は全量を一括で投入してもよく、複数回に分けて分割投入してもよい。また、重合開始剤や連鎖移動剤の一部または全部を反応容器中に滴下しながら、重合反応を進行させてもよい。
本発明のピッチコントロール剤(上記(メタ)アクリルアミド系両性ポリマーまたはその溶液)を、パルプ化工程または抄紙工程のパルプスラリーに添加することにより、ピッチコントロール(ピッチ障害の抑制)が実施される。ピッチコントロール剤を添加する場所は特に限定されないが、ピッチ障害の発生箇所またはその上流で、パルプスラリーにピッチコントロール剤を添加することが好ましい。特に、本発明では、パルプ化工程におけるピッチ障害発生箇所の上流で、パルプスラリーにピッチコントロール剤を添加することが好ましい。
表1に示すモノマー成分合計100質量部(モノマー成分全量の70質量%)、および連鎖移動剤としてメタリルスルホン酸ナトリウム1質量部を、濃度30質量%になるように水道水で希釈した。この水溶液を500mLのセパラブルフラスコに仕込み、硫酸を添加してpHを2.5に調整した。溶液中に窒素を吹き込み続けながら60℃に昇温し、重合開始剤として過硫酸アンモニウムを滴下し、重合させた。重合に伴う昇温により温度が95℃に到達してから5分後に、最初の仕込みと同一比率でモノマー成分合計43質量部(モノマー成分全量の30質量%)を滴下した。
<ピッチ含有パルプスラリー(pH11)の調製、およびピッチコントロール剤の添加>
水酸化ナトリウムおよび炭酸水素ナトリウムを用いて、pH11、電気伝導度4300μS/cmに調整した蒸留水300mLに、絶乾1gの晒しクラフトパルプを分散させ、0.33質量%のパルプスラリーを作製した。撹拌機にて十分にパルプを分散させたパルプスラリーに、トール油ピッチをテトラヒドロフランに溶解させた50質量%のピッチ溶液1.0g(対パルプで50質量%)を添加した。このピッチ含有パルプスラリーに、各実施例および比較例のピッチコントロール剤を固形で0.01g(パルプに対して0.01質量%)添加し、3分間攪拌した。その後、5質量%硫酸を加え、pH7に調整した。
実施例および比較例のピッチコントロール剤を添加したパルプスラリーを、No.5Aのろ紙(直径110mm)の上に流し込み、吸引濾過を行い、パルプと水を分離した。パルプが付着したろ紙を、105℃に調整したドラムドライヤーで3分間乾燥させて、評価用試料とし、以下の基準により、目視観察による分散性評価、および白色度計による定着性評価を行った。
評価用試料のろ紙上に残存している褐色の凝集物(ピッチ)の大きさを、目視観察により以下の基準で評価した。評価点が高い(凝集物のサイズが小さい)ほど、ピッチの分散性が優れている。
5:直径0.5mm以上の凝集物が確認されない
4:直径0.5~1mmの凝集物が確認される
3:直径1~2mmの凝集物が確認される
2:直径2~3mmの凝集物が確認される
1:直径3mmを超える凝集物が確認される
分光色彩・白度計(日本電色工業製 PF-10)を用いて評価用試料のISO白色度(L値)を測定し、3か所のL値の平均値を定着性の指標とした。評価点が高い(L値が小さい)ほどピッチの定着性が優れており、パルプに定着しているピッチの量が多く、水中に遊離しているピッチの量が少ないことを意味する。
3:L値が70未満
2:L値が70~80
1:L値が80を超える
炭酸水素ナトリウムおよび硫酸を用いて、pH7、電気伝導度4300μS/cmに調整した蒸留水を用いたこと以外は上記と同様にして、パルプスラリーの作製およびピッチ溶液の添加を行い、実施例2、実施例5および比較例1のピッチコントロール剤を添加して3分間撹拌した。その後、上記と同様に分散性および定着性の評価を実施した。
DADMAC:ジアリルジメチルアンモニウムクロリド
DMQ:アクリロイルオキシエチルトリメチルアンモニウムクロリド
DMBC:アクリロイルオキシエチルベンジルジメチルアンモニウムクロリド
AA:アクリル酸
IA:イタコン酸
AM:アクリルアミド
Claims (11)
- (メタ)アクリルアミド系両性ポリマーを含むピッチコントロール剤であって、
前記(メタ)アクリルアミド系両性ポリマーは、共重合モノマー成分として、50モル%以上の(メタ)アクリルアミド、0.5~20モル%のジアリルジアルキルアンモニウム塩、および0.1~14モル%のアニオン性モノマーを含有する、ピッチコントロール剤。 - 前記(メタ)アクリルアミド系両性ポリマーは、共重合モノマー成分中の前記ジアリルジアルキルアンモニウム塩の含有量が、前記アニオン性モノマーの含有量に対して、電荷比で1.4倍以上である、請求項1に記載のピッチコントロール剤。
- 前記アニオン性モノマーとして、α,β‐不飽和カルボン酸またはその塩を含む、請求項1または2に記載のピッチコントロール剤。
- 前記α,β‐不飽和カルボン酸として、α,β‐不飽和ジカルボン酸またはその塩を含む、請求項3に記載のピッチコントロール剤。
- 前記α,β‐不飽和ジカルボン酸がイタコン酸である、請求項4に記載のピッチコントロール剤。
- 前記α,β‐不飽和カルボン酸として、α,β‐不飽和モノカルボン酸またはその塩を含む、請求項3~5のいずれか1項に記載のピッチコントロール剤。
- 前記α,β‐不飽和モノカルボン酸がアクリル酸である、請求項6に記載のピッチコントロール剤。
- パルプスラリー中に、請求項1~7のいずれか1項に記載のピッチコントロール剤を添加することを特徴とする、ピッチコントロール方法。
- パルプ化工程において、前記ピッチコントロール剤を添加することを特徴とする、請求項8に記載のピッチコントロール方法。
- 前記パルプスラリーのpHが9以上である、請求項8または9に記載のピッチコントロール方法。
- パルプスラリー中に前記ピッチコントロール剤を添加した後、pH9以上の状態から、pHを8.5以下に低下させることを特徴とする、請求項8~10のいずれか1項に記載のピッチコントロール方法。
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP17806592.6A EP3467202B1 (en) | 2016-05-30 | 2017-05-29 | Pitch-controlling agent and pitch-controlling method |
| ES17806592T ES2867851T3 (es) | 2016-05-30 | 2017-05-29 | Agente de control de componentes resínicos y procedimiento de control de componentes resínicos |
| CA2992541A CA2992541C (en) | 2016-05-30 | 2017-05-29 | Pitch-controlling agent and pitch-controlling method |
| BR112018068470-8A BR112018068470B1 (pt) | 2016-05-30 | 2017-05-29 | agente de controle de pitch e método de controle de pitch |
| AU2017272665A AU2017272665B2 (en) | 2016-05-30 | 2017-05-29 | Pitch-controlling agent and pitch-controlling method |
| US15/749,891 US10240295B2 (en) | 2016-05-30 | 2017-05-29 | Pitch-controlling agent and pitch-controlling method |
| CN201780002083.XA CN107849820B (zh) | 2016-05-30 | 2017-05-29 | 树脂状物控制剂以及树脂状物控制方法 |
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| JP2016107578A JP6257700B2 (ja) | 2016-05-30 | 2016-05-30 | ピッチコントロール剤およびピッチコントロール方法 |
| JP2016-107578 | 2016-05-30 |
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| EP (1) | EP3467202B1 (ja) |
| JP (1) | JP6257700B2 (ja) |
| CN (1) | CN107849820B (ja) |
| AU (1) | AU2017272665B2 (ja) |
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| JP7445859B2 (ja) * | 2019-12-16 | 2024-03-08 | ハイモ株式会社 | 両性水溶性高分子からなるピッチコントロール剤 |
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- 2017-05-29 BR BR112018068470-8A patent/BR112018068470B1/pt active IP Right Grant
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| JPS57149592A (en) * | 1981-02-17 | 1982-09-16 | Calgon Corp | Reduction of precipitation of pitch like resin during papermaking |
| JPS6461596A (en) * | 1987-03-12 | 1989-03-08 | Sumitomo Chemical Co | Paper strength increasing method |
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| Publication number | Publication date |
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| EP3467202A4 (en) | 2019-08-14 |
| US20180230652A1 (en) | 2018-08-16 |
| ES2867851T3 (es) | 2021-10-21 |
| JP2017214669A (ja) | 2017-12-07 |
| BR112018068470B1 (pt) | 2021-01-19 |
| CN107849820B (zh) | 2019-06-28 |
| EP3467202B1 (en) | 2021-02-17 |
| AU2017272665A1 (en) | 2018-08-09 |
| US10240295B2 (en) | 2019-03-26 |
| AU2017272665B2 (en) | 2019-07-04 |
| BR112018068470A2 (pt) | 2019-01-22 |
| CA2992541C (en) | 2018-05-29 |
| JP6257700B2 (ja) | 2018-01-10 |
| EP3467202A1 (en) | 2019-04-10 |
| CA2992541A1 (en) | 2017-12-07 |
| CN107849820A (zh) | 2018-03-27 |
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