JPH08239423A - Production of poly(sodium acrylate) - Google Patents
Production of poly(sodium acrylate)Info
- Publication number
- JPH08239423A JPH08239423A JP4385595A JP4385595A JPH08239423A JP H08239423 A JPH08239423 A JP H08239423A JP 4385595 A JP4385595 A JP 4385595A JP 4385595 A JP4385595 A JP 4385595A JP H08239423 A JPH08239423 A JP H08239423A
- Authority
- JP
- Japan
- Prior art keywords
- sodium polyacrylate
- acrylic acid
- polymerization
- aqueous solution
- solvent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- C08F20/00—Homopolymers and 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
- C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
- C08F20/04—Acids, Metal salts or ammonium salts thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は炭酸カルシウム製造の際
の分散剤等として好適に用いられるポリアクリル酸ソー
ダの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing sodium polyacrylate, which is preferably used as a dispersant in producing calcium carbonate.
【０００２】[0002]
【従来の技術】ポリアクリル酸ソーダは、分散剤、スケ
ール防止剤、金属イオン封鎖剤、洗浄用ビルダー等とし
て広く用いられている。2. Description of the Related Art Sodium polyacrylate is widely used as a dispersant, scale inhibitor, sequestering agent, builder for cleaning, and the like.
【０００３】従来ポリアクリル酸ソーダの製造方法とし
ては、有機あるいは無機系の連鎖移動剤の存在下に水溶
媒中で重合する方法、又は連鎖移動剤の存在下に低級ア
ルコールを溶媒として重合する方法が知られている。As a conventional method for producing sodium polyacrylate, a method of polymerizing in an aqueous solvent in the presence of an organic or inorganic chain transfer agent, or a method of polymerizing a lower alcohol in the presence of a chain transfer agent as a solvent It has been known.
【０００４】このポリアクリル酸ソーダを炭酸カルシウ
ムスラリー製造用の分散剤として使用する用途はポリア
クリル酸ソーダの重要な用途の一つであるが、分散剤と
して使用した場合に、炭酸カルシウムスラリーの粘度を
低下させる性能に優れたポリアクリル酸ソーダが得られ
れば、分散剤の使用量を削減することができ望ましい。The use of this sodium polyacrylate as a dispersant for producing a calcium carbonate slurry is one of the important uses of the sodium polyacrylate, but when it is used as a dispersant, the viscosity of the calcium carbonate slurry is increased. It is desirable to obtain a poly (sodium acrylate) excellent in the ability to reduce the use amount of the dispersant because the amount of the dispersant used can be reduced.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、炭酸カルシ
ウムスラリー製造用の分散剤として使用した場合に、炭
酸カルシウムスラリー粘度を低下させる性能に優れ、分
散剤の使用量の削減が可能な分散性に優れたポリアクリ
ル酸ソーダの製造方法を提供することを目的とする。The present invention, when used as a dispersant for producing a calcium carbonate slurry, has an excellent performance of lowering the viscosity of the calcium carbonate slurry and is capable of reducing the amount of the dispersant used. It is an object of the present invention to provide a method for producing excellent sodium polyacrylate.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、前記目的
を達成するために鋭意研究を重ねた結果、アクリル酸を
重合する際、重合開始剤の総量の特定割合をあらかじめ
重合溶媒中に仕込んでおき、残量をアクリル酸と共に重
合溶媒中に滴下させて重合を行うことにより、分散性能
に優れたポリアクリル酸ソーダを得ることができること
を見出し、この知見に基づいて本発明を完成するに至っ
た。Means for Solving the Problems As a result of intensive studies for achieving the above-mentioned object, the present inventors have found that when acrylic acid is polymerized, a specific ratio of the total amount of the polymerization initiator is set in advance in a polymerization solvent. It was found that it is possible to obtain a sodium polyacrylate having excellent dispersion performance by carrying out polymerization by dropping the remaining amount together with acrylic acid into a polymerization solvent, and complete the present invention based on this finding. Came to.
【０００７】すなわち、本発明は、アクリル酸を重合溶
媒中で重合開始剤の存在下重合させる際、重合開始剤の
総量の４０〜８５重量％を重合溶媒中にあらかじめ仕込
んでおき、重合開始剤の残量をアクリル酸と共に重合溶
媒中に滴下して重合させ、実質的に重合が完了したのち
水酸化ナトリウムで中和することを特徴とするポリアク
リル酸ソーダの製造方法を提供するものである。That is, according to the present invention, when acrylic acid is polymerized in a polymerization solvent in the presence of a polymerization initiator, 40 to 85% by weight of the total amount of the polymerization initiator is charged in advance in the polymerization solvent. The present invention provides a method for producing sodium polyacrylate, characterized in that the remaining amount of is polymerized by dropping it in a polymerization solvent together with acrylic acid, and is neutralized with sodium hydroxide after the polymerization is substantially completed. .
【０００８】本発明において重合溶媒としては、通常、
水系溶媒が用いられ、好ましくは水と低級アルコールの
混合物が用いられれる。低級アルコールとしては、メタ
ノール、エタノール、イソプロパノール、ｔ−ブタノー
ル等が用いられる。In the present invention, the polymerization solvent is usually
An aqueous solvent is used, and preferably a mixture of water and a lower alcohol is used. As the lower alcohol, methanol, ethanol, isopropanol, t-butanol and the like are used.
【０００９】水と低級アルコールの混合比、すなわち、
水／低級アルコール比（重量比）は１０／９０〜９０／
１０とすることが好ましい。特に好ましい範囲は４０／
６０〜６０／４０である。また、重合溶媒は、通常、ア
クリル酸の１〜５倍量（重量）、好ましくは１．２〜
３．０倍量（重量）用いられる。The mixing ratio of water and lower alcohol, that is,
Water / lower alcohol ratio (weight ratio) is 10/90 to 90 /
It is preferably 10. Particularly preferred range is 40 /
60 to 60/40. The polymerization solvent is usually 1 to 5 times (weight) of acrylic acid, preferably 1.2 to
3.0 times the amount (weight) is used.
【００１０】本発明において重合開始剤としては、通
常、ラジカル開始剤が用いられ、好ましくは過硫酸塩、
過酸化物が用いられる。過硫酸塩としては、過硫酸ナト
リウム、過硫酸カリウム、過硫酸アンモニウム等が、過
酸化物としては、クメンハイドロパーオキサイド等のハ
イドロパーオキサイド化合物、１−ブチルパーオキシ−
２−エチルヘキサネート等のアルキルパーエステル化合
物、過酸化水素等が用いられる。これらの重合開始剤は
単独で用いてもよいし、併用して用いてもよい。In the present invention, a radical initiator is usually used as the polymerization initiator, preferably a persulfate,
Peroxide is used. Examples of the persulfate include sodium persulfate, potassium persulfate and ammonium persulfate, and examples of the peroxide include hydroperoxide compounds such as cumene hydroperoxide and 1-butylperoxy-
An alkyl perester compound such as 2-ethylhexanate, hydrogen peroxide and the like are used. These polymerization initiators may be used alone or in combination.
【００１１】本発明の特徴とするところは、使用する重
合開始剤の総量の４０〜８５重量％、好ましくは４５〜
６０重量％をあらかじめ重合溶媒中に仕込んでおき、そ
の中にアクリル酸と残量の重合開始剤を滴下して重合反
応を行うことである。アクリル酸と重合開始剤とは混合
して滴下してもよいし、別々に滴下してもよいが、別々
に滴下することが好ましい。重合開始剤は総量で、アク
リル酸に対し、通常０．１〜１０重量％、好ましくは１
〜５重量％用いられる。A feature of the present invention is that the total amount of the polymerization initiator used is 40 to 85% by weight, preferably 45 to 85% by weight.
It means that 60% by weight is charged in advance in a polymerization solvent, and acrylic acid and the remaining amount of a polymerization initiator are dropped therein to carry out a polymerization reaction. The acrylic acid and the polymerization initiator may be mixed and added dropwise, or may be added separately, but it is preferable to add them separately. The total amount of the polymerization initiator is usually 0.1 to 10% by weight, preferably 1 based on acrylic acid.
~ 5 wt% is used.
【００１２】重合反応は、通常、６０〜１２０℃、好ま
しくは７５〜８５℃の温度で、通常、常圧〜１０ｋｇ／
ｃｍ2Ｇ、好ましくは常圧〜１ｋｇ／ｃｍ2Ｇの圧力で行
われる。The polymerization reaction is usually carried out at a temperature of 60 to 120 ° C., preferably 75 to 85 ° C. and usually atmospheric pressure to 10 kg /
It is carried out at a pressure of cm 2 G, preferably atmospheric pressure to 1 kg / cm 2 G.
【００１３】アクリル酸と重合開始剤の滴下は通常、１
〜６時間、好ましくは３．５〜４．５時間かけて行い、
滴下終了後、通常１〜２時間の熟成を行うことが好まし
い。この時、本発明の効果を阻害しない範囲内でアクリ
ル酸と共に、メタクリル酸、アクリル酸メチルなどのア
クリル酸エステル、アクリロニトリル、アクリル酸アミ
ドなどのアクリル酸と共重合可能なエチレン性不飽和化
合物をコモノマーとして使用してもよい。The addition of acrylic acid and the polymerization initiator is usually 1
~ 6 hours, preferably 3.5-4.5 hours,
After completion of the dropping, it is usually preferable to perform aging for 1 to 2 hours. At this time, an acrylic acid such as methacrylic acid and methyl acrylate, an acrylonitrile, and an acrylic acid such as acrylic acid amide can be copolymerized with acrylic acid within a range that does not impair the effects of the present invention. May be used as.
【００１４】重合反応終了後、ＮａＯＨ水溶液により反
応系を中和してｐＨ８〜１２（好ましくは９〜１１）に
すると目的とするポリアクリル酸ソーダが得られる。中
和前、中和後に必要に応じ、低級アルコール若しくは低
級アルコールと水の留去を行い、ポリアクリル酸ソーダ
の３０〜５０重量％水溶液とする。After the completion of the polymerization reaction, the reaction system is neutralized with an aqueous NaOH solution to a pH of 8 to 12 (preferably 9 to 11) to obtain the desired sodium polyacrylate. Before and after neutralization, if necessary, a lower alcohol or lower alcohol and water are distilled off to obtain a 30 to 50 wt% aqueous solution of sodium polyacrylate.
【００１５】得られたポリアクリル酸ソーダ水溶液は分
散性に優れており、炭酸カルシウムスラリーの分散剤と
して優れた分散性能を有している。The obtained aqueous solution of sodium polyacrylate is excellent in dispersibility and has excellent dispersibility as a dispersant for a calcium carbonate slurry.
【００１６】[0016]
【実施例】以下、本発明の実施例及びその比較例によっ
て本発明を更に具体的に説明するが、本発明はこれらの
実施例に限定されるものではない。The present invention will be described in more detail below with reference to examples of the present invention and comparative examples thereof, but the present invention is not limited to these examples.
【００１７】実施例１ 攪拌機、温度計、還流冷却管を取付けた３００ｍｌフラ
スコにイソプロパノール（以下、ＩＰＡと略する。）５
５ｇ、純水４２ｇ、過硫酸アンモニウム（以下ＡＰＳと
略する。）１．１ｇを仕込み攪拌しながら８０℃に加熱
した。ここにアクリル酸９０ｇ、１０重量％ＡＰＳ水溶
液１１．０ｇを各々独立に、かつ同時に４時間かけて滴
下した。滴下終了後、８０℃で１時間熟成を行い、熟成
後ＩＰＡ及び水を系内より共沸留去した。留去量は７０
ｇで、このときフラスコ中のＩＰＡ濃度は０．５重量％
以下となった。冷却後、４０重量％のＮａＯＨ水溶液１
２５ｇを加え、中和し、更に系内ｐＨが１０になるよう
に４０重量％のＮａＯＨ水溶液を添加した。そののち４
５ｇの水を加え、４０重量％ポリアクリル酸ソーダ水溶
液を得た。Example 1 Isopropanol (hereinafter abbreviated as IPA) 5 in a 300 ml flask equipped with a stirrer, a thermometer, and a reflux condenser.
5 g, pure water 42 g, and ammonium persulfate (hereinafter abbreviated as APS) 1.1 g were charged and heated to 80 ° C. with stirring. 90 g of acrylic acid and 11.0 g of a 10 wt% APS aqueous solution were added dropwise independently and simultaneously over 4 hours. After completion of the dropping, aging was carried out at 80 ° C. for 1 hour, and IPA and water were azeotropically distilled from the system after aging. Distillation amount is 70
g, at this time, the IPA concentration in the flask was 0.5% by weight.
It was as follows. After cooling, 40 wt% NaOH aqueous solution 1
25 g was added and neutralized, and a 40 wt% NaOH aqueous solution was added so that the system pH would be 10. After that 4
5 g of water was added to obtain a 40 wt% sodium polyacrylate aqueous solution.
【００１８】実施例２ 実施例１において、フラスコに仕込むＡＰＳを０．９
ｇ、滴下する１０重量％ＡＰＳ水溶液を１３ｇとした以
外は全く同様の方法で４０重量％ポリアクリル酸ソーダ
水溶液を得た。Example 2 In Example 1, the APS charged in the flask was set to 0.9.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in exactly the same manner except that the 10 wt% APS aqueous solution to be dropped was 13 g.
【００１９】実施例３ 実施例１において、フラスコに仕込むＡＰＳを１．０
ｇ、滴下する１０重量％ＡＰＳ水溶液を１０ｇとした以
外は全く同様の方法で４０重量％ポリアクリル酸ソーダ
水溶液を得た。Example 3 In Example 1, 1.0 APS charged in the flask was used.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in exactly the same manner except that the 10 wt% APS aqueous solution to be dropped was 10 g.
【００２０】実施例４ 実施例１において、フラスコに仕込むＡＰＳを１．３
ｇ、滴下する１０重量％ＡＰＳ水溶液を９ｇとした以外
は全く同様の方法で４０重量％ポリアクリル酸ソーダ水
溶液を得た。Example 4 In Example 1, the APS charged in the flask was 1.3%.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in the same manner except that the 10 wt% APS aqueous solution to be dropped was 9 g.
【００２１】実施例５ 実施例１において、フラスコに仕込むＡＰＳを１．６５
ｇ、滴下する１０重量％ＡＰＳ水溶液を５．５ｇとした
以外は全く同様の方法で４０重量％ポリアクリル酸ソー
ダ水溶液を得た。Example 5 In Example 1, the APS charged in the flask was 1.65.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in exactly the same manner except that the 10 wt% APS aqueous solution to be dropped was 5.5 g.
【００２２】実施例６ 実施例１において、フラスコに仕込むＡＰＳを１．９
ｇ、滴下する１０重量％ＡＰＳ水溶液を３ｇとした以外
は全く同様の方法で４０重量％ポリアクリル酸ソーダ水
溶液を得た。Example 6 In Example 1, the APS charged in the flask was 1.9.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in the same manner except that the 10 wt% APS aqueous solution to be dropped was 3 g.
【００２３】比較例１ 実施例１において、フラスコに仕込むＡＰＳを０．５５
ｇ、滴下する１０重量％ＡＰＳ水溶液を１６．５ｇとし
た以外は全く同様の方法で４０重量％ポリアクリル酸ソ
ーダ水溶液を得た。Comparative Example 1 In Example 1, 0.55 APS was charged in the flask.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in exactly the same manner except that the 10 wt% APS aqueous solution to be dropped was 16.5 g.
【００２４】比較例２ 実施例１において、フラスコに仕込むＡＰＳを０．８
ｇ、滴下する１０重量％ＡＰＳ水溶液を１４ｇとした以
外は全く同様の方法で４０重量％ポリアクリル酸ソーダ
水溶液を得た。Comparative Example 2 In Example 1, the APS charged in the flask was 0.8.
g, a 40 wt% sodium polyacrylate aqueous solution was obtained in the same manner except that the 10 wt% APS aqueous solution to be dropped was 14 g.
【００２５】比較例３ 実施例１において、フラスコに仕込むＡＰＳを２．２
ｇ、１０重量％ＡＰＳ水溶液を滴下しないこと以外は全
く同様の方法で４０重量％ポリアクリル酸ソーダ水溶液
を得た。Comparative Example 3 In Example 1, 2.2 APS was charged in the flask.
A 40 wt% sodium polyacrylate aqueous solution was obtained in exactly the same manner except that the 10 wt% APS aqueous solution was not added dropwise.
【００２６】比較例４ 実施例１において、フラスコにＡＰＳを仕込まず、滴下
する１０重量％ＡＰＳ水溶液を２２ｇとした以外は全く
同様の方法で４０重量％ポリアクリル酸ソーダ水溶液を
得た。Comparative Example 4 A 40 wt% sodium polyacrylate aqueous solution was obtained in the same manner as in Example 1 except that the flask was not charged with APS and 22 g of the 10 wt% APS aqueous solution was added dropwise.
【００２７】参考例１ 東亜合成化学製分散剤Ｔ−４０を標品として用いた。 評価方法 上記実施例１〜６、比較例１〜４、参考例１で得られた
分散剤を用いて性能を下記のようにして評価した。結果
を表１に示す。 初期分散性能 ７５重量％炭酸カルシウムスラリーになるように蒸留水
を計量し、これに分散剤を炭酸カルシウムに対して所定
量添加し、ホモジナイザーをゆっくり回転させながら炭
酸カルシウム（平均粒径０．６７μｍ）を入れ、全量投
入後、３０００ｒｐｍで１５分間分散させた。次いで、
２５℃恒温槽内で１時間静置後、Ｂ型粘度計にて粘度を
測定した。 長期分散安定性能 と同様にして炭酸カルシウムを分散させ、次いで２５
℃恒温槽内で４週間静置した。次いで、測定前に振盪機
で５分間振盪させた後、Ｂ型粘度計にて粘度を測定し
た。Reference Example 1 Dispersant T-40 manufactured by Toagosei Kagaku was used as a standard. Evaluation method Using the dispersants obtained in Examples 1 to 6, Comparative Examples 1 to 4 and Reference Example 1, the performance was evaluated as follows. The results are shown in Table 1. Initial Dispersion Performance Distilled water was weighed so as to form a 75 wt% calcium carbonate slurry, a predetermined amount of a dispersant was added to the calcium carbonate, and calcium carbonate (average particle size 0.67 μm) was added while slowly rotating the homogenizer. After adding the whole amount, the mixture was dispersed at 3000 rpm for 15 minutes. Then
After standing still in a thermostat at 25 ° C for 1 hour, the viscosity was measured with a B-type viscometer. Disperse calcium carbonate in the same manner as long-term dispersion stability, and then 25
It was left to stand in a thermostat bath at ℃ for 4 weeks. Next, before the measurement, it was shaken for 5 minutes with a shaker, and then the viscosity was measured with a B-type viscometer.
【００２８】[0028]
【表１】 評価結果 初期分散性能は表１からわかるように、開始剤分割量と
ともに性能が向上し、２５％で標品と同等になり、４５
〜５５％で極大値を示し、実施例１では性能が１５％向
上している。[Table 1] Evaluation results As shown in Table 1, the initial dispersion performance was improved with the amount of the initiator divided, and at 25%, the performance was equivalent to that of the standard product.
The maximum value is exhibited at ˜55%, and the performance is improved by 15% in Example 1.
【００２９】また、添加量を減じるに従い性能は低下す
るが、本発明の分散剤は添加量３０％減でも標品と同等
の性能を示した。The performance of the dispersant of the present invention decreased as the addition amount was decreased, but the dispersant of the present invention showed the same performance as the standard product even when the addition amount was decreased by 30%.
【００３０】また、長期安定性に関しても本発明の分散
剤は標品と同等の性能を示した。Further, with respect to long-term stability, the dispersant of the present invention showed performance equivalent to that of the standard product.
【００３１】[0031]
【発明の効果】本発明により、炭酸カルシウムスラリー
製造用の分散剤として使用した場合に、炭酸カルシウム
スラリー粘度をさせる性能に優れ、分散剤の使用量の削
減が可能な分散性に優れたポリアクリル酸ソーダを製造
することができ、その工業的価値は極めて大である。INDUSTRIAL APPLICABILITY According to the present invention, when used as a dispersant for producing a calcium carbonate slurry, a polyacryl having excellent dispersibility capable of reducing the viscosity of the calcium carbonate slurry and reducing the amount of the dispersant used. Acid soda can be produced and its industrial value is extremely high.
Claims (3)
存在下で重合させる際、重合開始剤の総量の４０〜８５
重量％を重合溶媒中にあらかじめ仕込んでおき、重合開
始剤の残量をアクリル酸と共に重合溶媒中に滴下して重
合させ、実質的に重合が完了したのち水酸化ナトリウム
で中和することを特徴とするポリアクリル酸ソーダの製
造方法。1. When polymerizing acrylic acid in a polymerization solvent in the presence of a polymerization initiator, the total amount of the polymerization initiator is 40 to 85.
It is characterized by preliminarily charging wt% in a polymerization solvent, and dropping the remaining amount of the polymerization initiator together with acrylic acid into the polymerization solvent to polymerize, and neutralizing with sodium hydroxide after the polymerization is substantially completed. And a method for producing sodium polyacrylate.
物である請求項１記載のポリアクリル酸ソーダの製造方
法。2. The method for producing sodium polyacrylate according to claim 1, wherein the polymerization initiator is a persulfate and / or a peroxide.
である請求項１又は２記載のポリアクリル酸ソーダの製
造方法。3. The method for producing sodium polyacrylate according to claim 1, wherein the polymerization solvent is a mixture of water and a lower alcohol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04385595A JP3658032B2 (en) | 1995-03-03 | 1995-03-03 | Method for producing sodium polyacrylate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04385595A JP3658032B2 (en) | 1995-03-03 | 1995-03-03 | Method for producing sodium polyacrylate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08239423A true JPH08239423A (en) | 1996-09-17 |
| JP3658032B2 JP3658032B2 (en) | 2005-06-08 |
Family
ID=12675329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04385595A Expired - Fee Related JP3658032B2 (en) | 1995-03-03 | 1995-03-03 | Method for producing sodium polyacrylate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3658032B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020084907A (en) * | 2000-10-11 | 2002-11-16 | 신영화성공업 주식회사 | Manufacturing method of dispersant for preparing calcium carbonate slurry |
| WO2011136237A1 (en) | 2010-04-26 | 2011-11-03 | 株式会社日本触媒 | Polyacrylic acid (salt), polyacrylic acid (salt)-based water-absorbing resin, and process for producing same |
| WO2011136238A1 (en) | 2010-04-26 | 2011-11-03 | 株式会社日本触媒 | Polyacrylate (salt), polyacrylate (salt) water-absorbent resin, and manufacturing method for same |
| CN112300317A (en) * | 2020-11-18 | 2021-02-02 | 常熟聚和化学有限公司 | Synthesis method of high molecular weight sodium polyacrylate dispersant |
| CN112409529A (en) * | 2020-11-12 | 2021-02-26 | 常熟聚和化学有限公司 | Method for preparing sodium polyacrylate based on acrylic acid/dimethyl diallyl ammonium chloride and application |
-
1995
- 1995-03-03 JP JP04385595A patent/JP3658032B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020084907A (en) * | 2000-10-11 | 2002-11-16 | 신영화성공업 주식회사 | Manufacturing method of dispersant for preparing calcium carbonate slurry |
| WO2011136237A1 (en) | 2010-04-26 | 2011-11-03 | 株式会社日本触媒 | Polyacrylic acid (salt), polyacrylic acid (salt)-based water-absorbing resin, and process for producing same |
| WO2011136238A1 (en) | 2010-04-26 | 2011-11-03 | 株式会社日本触媒 | Polyacrylate (salt), polyacrylate (salt) water-absorbent resin, and manufacturing method for same |
| CN112409529A (en) * | 2020-11-12 | 2021-02-26 | 常熟聚和化学有限公司 | Method for preparing sodium polyacrylate based on acrylic acid/dimethyl diallyl ammonium chloride and application |
| CN112300317A (en) * | 2020-11-18 | 2021-02-02 | 常熟聚和化学有限公司 | Synthesis method of high molecular weight sodium polyacrylate dispersant |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3658032B2 (en) | 2005-06-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH07504452A (en) | Method for producing copolymer of acid group-containing monoethylenically unsaturated monomer and N-vinyl lactam | |
| US5395903A (en) | Conjugated diene chain-transfer agents for polymerization of olefinically unsaturated (co)monomers | |
| EP0108909A1 (en) | Process for producing polymaleate | |
| JPH06287231A (en) | Amine - thiol chain transfer agent | |
| JP3650724B2 (en) | (Meth) acrylic acid copolymer and method for producing the same | |
| JPH08239423A (en) | Production of poly(sodium acrylate) | |
| JPS5867706A (en) | Manufacture of copolymer from monoethylenically unsaturated mono- and dicarboxylic acid | |
| GB2123013A (en) | Production of acrylamide polymers | |
| JP3580397B2 (en) | Method for producing aqueous dispersion of water-soluble cationic polymer | |
| GB2058801A (en) | Process for the preparation of aqueous solutions of low molecular weight polyacrylic acids or their salts | |
| JPH06263803A (en) | Production and use of water-soluble (meth)acrylic acid polymer | |
| JPH0597931A (en) | Production of n-vinylcarboxylic acid amide polymer | |
| JP2605330B2 (en) | Paper Strengthening Method | |
| JPS63159366A (en) | Peresters, production thereof and use thereof as polymerization initiator | |
| JPS60212410A (en) | Preparation of maleate copolymer | |
| JPS62243607A (en) | Soap-free emulsion polymerization of vinyl monomer containing basic nitrogen atom | |
| US3476717A (en) | Process for the production of polymers | |
| JPS6156169B2 (en) | ||
| JPS595201B2 (en) | Emulsion polymerization method using oligomers | |
| JPS6050809B2 (en) | Method for producing acrylamide polymer | |
| JPS6043847B2 (en) | Method for producing acrylic aqueous resin dispersion | |
| JPH06502142A (en) | Allyl peroxyketal chain transfer agent | |
| JP2005015697A (en) | Method for producing aqueous emulsion composition | |
| JPH051287B2 (en) | ||
| JPH0215568B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A711 | Notification of change in applicant |
Effective date: 20041012 Free format text: JAPANESE INTERMEDIATE CODE: A712 |
|
| RD02 | Notification of acceptance of power of attorney |
Free format text: JAPANESE INTERMEDIATE CODE: A7422 Effective date: 20041012 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050222 |
|
| A61 | First payment of annual fees (during grant procedure) |
Effective date: 20050311 Free format text: JAPANESE INTERMEDIATE CODE: A61 |
|
| R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| LAPS | Cancellation because of no payment of annual fees |