JPH05247307A - Water absorbing resin composition - Google Patents
Water absorbing resin compositionInfo
- Publication number
- JPH05247307A JPH05247307A JP4578892A JP4578892A JPH05247307A JP H05247307 A JPH05247307 A JP H05247307A JP 4578892 A JP4578892 A JP 4578892A JP 4578892 A JP4578892 A JP 4578892A JP H05247307 A JPH05247307 A JP H05247307A
- Authority
- JP
- Japan
- Prior art keywords
- water
- absorbent resin
- resin composition
- ascorbic acid
- weight
- 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.)
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、吸水性樹脂組成物に関
するものである。更に詳しくは、吸水後、適当な条件下
に放置することにより吸水性樹脂が水系溶媒に可溶化す
る吸水性樹脂組成物に関するものである。FIELD OF THE INVENTION The present invention relates to a water absorbent resin composition. More specifically, it relates to a water-absorbent resin composition in which a water-absorbent resin is solubilized in an aqueous solvent by allowing it to stand under appropriate conditions after absorbing water.
【０００２】[0002]
【従来の技術およびその課題】近年、使い捨ておむつ、
生理用ナプキン等のいわゆる使い捨ての吸収物品の体液
吸収剤として、いわゆる吸水性樹脂がさかんに使用され
てきている。使用後の吸収物品は焼却或は土中に埋める
等して廃棄されているが、土中に埋め廃棄する場合、使
用されている吸水性樹脂はほとんどのものが合成高分子
であるため、吸水後の吸水性樹脂は、分解し難く、長時
間土中に残る。この様な現象は、今後環境問題のクロー
ズアップにより重大な問題とされる可能性がある。2. Description of the Related Art In recent years, disposable diapers,
So-called water-absorbent resins have been widely used as body fluid absorbents for so-called disposable absorbent articles such as sanitary napkins. Absorbent articles after use are discarded by incineration or buried in the soil, but when buried in the soil and discarded, most of the water-absorbent resins used are synthetic polymers The subsequent water-absorbent resin is difficult to decompose and remains in the soil for a long time. Such a phenomenon may become a serious problem in the future due to close-up of environmental problems.
【０００３】この対応策として吸水後の吸水性樹脂を焼
却処理或はコンポストに再利用することが提案されてい
るが、焼却には設備費や人件費が多量に必要で、経済的
・エネルギー的に好ましくない等の問題が残されてい
る。また、設備費や人件費が少ないコンポストに際して
は、吸水性樹脂が可溶化する方が好ましい可能性があ
る。 本発明の目的は、通常、廃棄・分解・分離の困難
な吸水後の吸水性樹脂が、水系溶媒に可溶化する為に、
廃棄・分解・分離・再利用が容易な吸水性樹脂組成物を
提供することにある。As a countermeasure for this, it has been proposed to incinerate the water-absorbent resin after water absorption or reuse it for composting, but incineration requires a large amount of equipment and labor costs, which is economical and energy-intensive. There are still problems such as unfavorable conditions. Further, in composting with low equipment cost and labor cost, it may be preferable that the water absorbent resin is solubilized. The purpose of the present invention is usually because the water-absorbent resin after water absorption, which is difficult to dispose, decompose, and separate, is solubilized in an aqueous solvent,
It is to provide a water-absorbent resin composition that can be easily discarded, decomposed, separated, and reused.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決するために、鋭意検討をかさねた結果、特定組成
の吸水性樹脂組成物を見いだした。Means for Solving the Problems The inventors of the present invention have made extensive studies in order to solve the above problems, and as a result, found a water-absorbent resin composition having a specific composition.
【０００５】即ち本発明は、吸水性樹脂１重量部に対し
て、アスコルビン酸０．０１〜１重量部および水１〜１
０００重量部が配合されてなり、且つ、ｐＨが４〜７．
５の範囲にあることを特徴とする吸水性樹脂組成物に関
するものである。That is, in the present invention, 0.01 to 1 part by weight of ascorbic acid and 1 to 1 part of water are added to 1 part by weight of the water absorbent resin.
000 parts by weight is added, and the pH is 4 to 7.
The present invention relates to a water absorbent resin composition characterized by being in the range of 5.
【０００６】本発明において、吸水性樹脂とは、水不溶
性の物で、水中で多量の水を吸収して膨潤し、ヒドロゲ
ルを形成するものである。好ましくは、自重の１０〜１
０００倍の吸水能力を有するものであり、この様な吸水
性樹脂として、例えば、デンプンーアクリロニトリルグ
ラフト共重合体の加水分解物の架橋体、デンプンーアク
リル酸グラフト共重合体の中和物の架橋体、アクリル酸
エステル−酢酸ビニル共重合体のケン化物の架橋体、ア
クリルアミド重合体の加水分解物の架橋体、アクリル酸
重合体の部分中和物の架橋体、イソブチレン−マレイン
酸共重合体の架橋体等を挙げることが出来る。また、本
発明に於て、アスコルビン酸は、たとえば、Ｌ−アスコ
ルビン酸、イソアスコルビン酸などである。中でも最も
一般的であるＬ−アスコルビン酸が好ましい。In the present invention, the water-absorbent resin is a water-insoluble substance that absorbs a large amount of water in water and swells to form a hydrogel. Preferably, the weight is 10 to 1
It has a water absorption capacity of 000 times, and as such a water-absorbing resin, for example, a cross-linked product of a hydrolyzate of a starch-acrylonitrile graft copolymer or a neutralized product of a starch-acrylic acid graft copolymer Of acrylic acid ester-vinyl acetate copolymer saponified product, acrylamide polymer hydrolyzate crosslinked product, acrylic acid polymer partially neutralized product crosslinked product, isobutylene-maleic acid copolymer Examples include cross-linked products. Further, in the present invention, the ascorbic acid is, for example, L-ascorbic acid, isoascorbic acid or the like. Of these, L-ascorbic acid, which is the most common, is preferable.
【０００７】本発明におけるアスコルビン酸の量は、吸
水性樹脂１重量部に対して、０．０１重量部以上１重量
部以下である。アスコルビン酸の量が、０．０１未満の
場合は実質有効量とはならず、吸水性樹脂の可溶化効果
が低くなり、１重量部を越える多量としても、増量に見
合った効果が得られないばかりでなく、逆に吸水後の吸
水性樹脂が強酸性となりｐＨの調整に塩基性物質を多量
に必要とするためコスト面から好ましくない。The amount of ascorbic acid in the present invention is 0.01 part by weight or more and 1 part by weight or less with respect to 1 part by weight of the water absorbent resin. When the amount of ascorbic acid is less than 0.01, the effective amount is not obtained, the solubilizing effect of the water-absorbent resin is low, and even if the amount exceeds 1 part by weight, the effect corresponding to the increase is not obtained. Not only that, but on the contrary, the water-absorbent resin after water absorption becomes strongly acidic and a large amount of a basic substance is required for adjusting the pH, which is not preferable in terms of cost.
【０００８】本発明に於いて、水は本発明の目的を十分
達成する為に、吸水性樹脂１重量部に対して、１重量部
以上１,０００重量部以下の量で用いる。この場合、水
は、必ずしも純水である必要はなく、尿等の体液の如き
各種成分が溶解もしくは分散さた水であっても良い。ま
た水の添加前既に、吸水性樹脂が尿などの体液に含まれ
る種々の成分を含有しても何らさしつかえ無い。In the present invention, water is used in an amount of 1 part by weight or more and 1,000 parts by weight or less with respect to 1 part by weight of the water-absorbent resin in order to sufficiently achieve the object of the present invention. In this case, the water is not necessarily pure water, and may be water in which various components such as body fluids such as urine are dissolved or dispersed. Further, even before the addition of water, the water-absorbent resin may contain various components contained in body fluid such as urine.
【０００９】本発明における吸水性樹脂組成物のｐＨは
４以上７．５以下の範囲でなくてはならない。この範囲
を逸脱すると可溶化の効率が著しく減少し、殆ど可溶化
しない。従って吸水性樹脂組成物のｐＨが本発明に於て
特に重要である。この発明における吸水性樹脂組成物の
ｐＨを調節するにあたり、ｐＨ調整剤を併用することも
可能である。ｐＨ調整剤は、一般的な酸・塩基でその役
割を十分に果たし、たとえば、硫酸・塩酸・水酸化ナト
リウム（水溶液）・水酸化カリウム（水溶液）などが挙
げられる。The pH of the water-absorbent resin composition of the present invention must be in the range of 4 or more and 7.5 or less. If it deviates from this range, the efficiency of solubilization is remarkably reduced, and almost no solubilization occurs. Therefore, the pH of the water absorbent resin composition is particularly important in the present invention. When adjusting the pH of the water absorbent resin composition of the present invention, it is possible to use a pH adjuster together. The pH adjusting agent plays a sufficient role with general acids and bases, and examples thereof include sulfuric acid, hydrochloric acid, sodium hydroxide (aqueous solution) and potassium hydroxide (aqueous solution).
【００１０】本発明に於て、吸水性樹脂に対するアスコ
ルビン酸と水の量、また吸水性樹脂組成物のｐＨが前記
の範囲であるならば、吸水性樹脂組成物とする手順は特
に制限されず、例えば、アスコルビン酸を溶解させた水
溶液を吸水性樹脂に加える方法、吸水した吸水性樹脂に
アスコルビン酸（またはアスコルビン酸水溶液）を加え
る方法、吸水性樹脂とアスコルビン酸の混合物に水を加
える方法などがある。In the present invention, if the amount of ascorbic acid and water relative to the water absorbent resin and the pH of the water absorbent resin composition are within the above ranges, the procedure for preparing the water absorbent resin composition is not particularly limited. , For example, a method of adding an aqueous solution in which ascorbic acid is dissolved to a water-absorbent resin, a method of adding ascorbic acid (or an ascorbic acid aqueous solution) to a water-absorbent resin that has absorbed water, a method of adding water to a mixture of the water-absorbent resin and ascorbic acid, etc. There is.
【００１１】[0011]
【作用】吸水性樹脂１重量部に対して、アスコルビン酸
０．０１〜１重量部および水１〜１０００重量部が配合
されてなり、且つ、ｐＨが４〜７．５の範囲にある本発
明の吸水性樹脂組成物は、通常は組成物中の吸水性樹脂
が吸水してゲル状を呈した後、経時的にポリマ−鎖を切
断・低分子量化し、水系溶媒に可溶化する。但し、条件
によってはゲル状を呈する前に吸水性樹脂の表面部分か
ら可溶化することも予想される。According to the present invention, 0.01 to 1 part by weight of ascorbic acid and 1 to 1000 parts by weight of water are mixed with 1 part by weight of the water absorbent resin, and the pH is in the range of 4 to 7.5. In the water-absorbent resin composition, the water-absorbent resin in the composition usually absorbs water to form a gel, and then the polymer chain is cleaved / lowered in molecular weight over time to be solubilized in an aqueous solvent. However, depending on the conditions, it is expected that the surface of the water-absorbent resin will be solubilized before it becomes gel-like.
【００１２】本発明の吸水性樹脂組成物を可溶化するに
際し、条件の選択により可溶化速度が変化することがあ
る。例えば、アスコルビン酸は１５０度を越える高温で
は分解されるので１５０度以下、好ましくは１００度以
下がよい。また、吸水性樹脂が固化されない程度の温度
とするのも好適である。詳しくは、０度以上、好ましく
は１５度以上がよく、特に好ましいのは室温である。ま
た、第３の成分、たとえば、金属イオン、たとえば、銅
イオンなどの影響により、ラジカルの発生が活発化され
て自己可溶化が促進されることもある。また、そほかの
活性化法として撹拌などが挙げられる。When solubilizing the water absorbent resin composition of the present invention, the solubilization rate may change depending on the selection of conditions. For example, ascorbic acid is decomposed at a high temperature of more than 150 ° C., so 150 ° C. or less, preferably 100 ° C. or less. It is also preferable to set the temperature to a level at which the water absorbent resin is not solidified. Specifically, it is preferably 0 degrees or more, preferably 15 degrees or more, and particularly preferably room temperature. Further, the generation of radicals may be activated and self-solubilization may be promoted by the influence of the third component, for example, a metal ion, for example, a copper ion. In addition, other activation methods include stirring and the like.
【００１３】この様な可溶化は吸水性樹脂の低分子量化
に起因するものであるが、処理条件を選択する事によ
り、その可溶化物の分子量の制御も可能である。Such solubilization is caused by lowering the molecular weight of the water absorbent resin, but the molecular weight of the solubilized product can be controlled by selecting the treatment conditions.
【００１４】[0014]
【実施例】以下に、この発明の具体的な実施例および比
較例を示すが、この発明は下記の実施例に限定されな
い。尚、実施例に記載の吸水性樹脂の可溶化度合は下記
の試験方法に従って測定した。また、単なる「％」は
「重量％」を、「部」は「重量部」をそれぞれ意味す
る。EXAMPLES Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. The degree of solubilization of the water absorbent resin described in the examples was measured according to the following test method. Further, mere “%” means “weight%”, and “part” means “part by weight”.
【００１５】（１）水可溶分 吸水性樹脂０．５ｇを脱イオン水に分散した溶液を１０
００ｇ、所定の時間後、濾紙で濾過し、濾液中の固形分
量を滴定により測定して次式に従って水可溶分を求め
た。(1) Water-Soluble Component A solution prepared by dispersing 0.5 g of a water-absorbent resin in deionized water was added to 10
00 g, after a predetermined time, the mixture was filtered through a filter paper, the solid content in the filtrate was measured by titration, and the water-soluble content was determined according to the following formula.
【００１６】[0016]
【数１】 [Equation 1]
【００１７】（２）組成物の状態 目視により可溶化状態を次のように比較した。(2) State of Composition The solubilized states were visually compared as follows.
【００１８】○：組成物が流動性を有する。◯: The composition has fluidity.
【００１９】×：組成物が含水ゲル状となり、流動性を
有さない。X: The composition was in the form of hydrous gel and had no fluidity.
【００２０】−吸水性樹脂の合成例− アクリル酸ナトリウム７４．９５モル％、アクリル酸２
５モル％およびトリメチロールプロパントリアクリレー
ト０．０５モル％からなるアクリル酸塩系単量体の３７
％水溶液４０００部を過硫酸アンモニウム２．０部及び
Ｌ−アスコルビン酸０．０８部を用いて窒素雰囲気中３
０〜８０℃で重合を行い、ゲル状含水架橋重合体を得
た。得られた含水ゲル状架橋重合体を１５０℃の熱風乾
燥で乾燥後、ハンマーミルで粉砕し、２０メッシュ通過
物の吸水性樹脂Ａを得た。-Synthesis Example of Water-Absorbent Resin- Sodium acrylate 74.95 mol%, acrylic acid 2
37% of acrylate type monomer consisting of 5 mol% and 0.05 mol% of trimethylolpropane triacrylate
% Aqueous solution 4000 parts of ammonium persulfate 2.0 parts and L-ascorbic acid 0.08 parts under nitrogen atmosphere 3
Polymerization was performed at 0 to 80 ° C to obtain a gel-like water-containing crosslinked polymer. The obtained water-containing gelled crosslinked polymer was dried by hot air drying at 150 ° C. and then pulverized with a hammer mill to obtain a water-absorbent resin A which passed through 20 mesh.
【００２１】−実施例１− ０．９％塩化ナトリウム水溶液４９．５ｇとＬ−アスコ
ルビン酸０．５ｇからなる水溶液に水酸化ナトリウムの
粒を２粒を加えて撹拌溶解させた。このように調製され
たアスコルビン酸水溶液を吸水性樹脂（三洋化成製「Ｉ
Ｍ１０００」）２ｇに添加して吸水性樹脂組成物（１）
を得た。吸水性樹脂組成物（１）のｐＨを測定したとこ
ろそのゲルのｐＨは６．４であった。吸水性樹脂組成物
（１）を２０゜C１６時間放置した後の可溶化程度は、表
１に示した通りであった。Example 1 Two sodium hydroxide particles were added to an aqueous solution containing 49.5 g of a 0.9% sodium chloride aqueous solution and 0.5 g of L-ascorbic acid and dissolved by stirring. The ascorbic acid aqueous solution prepared in this way was used as a water absorbent resin (“Iyo
M1000 ") Water-absorbent resin composition (1) added to 2 g
Got When the pH of the water absorbent resin composition (1) was measured, the pH of the gel was 6.4. The degree of solubilization after leaving the water absorbent resin composition (1) at 20 ° C. for 16 hours was as shown in Table 1.
【００２２】−実施例２− ０．９％塩化ナトリウム水溶液２５ｇにＬ−アスコルビ
ン酸（片山化学工業株式会社製、特級試薬）０．１ｇを
撹拌溶解させた。このように調製されたアスコルビン酸
水溶液に吸水性樹脂Ａを１ｇ添加して吸水性樹脂組成物
（２）を得た。吸水性樹脂組成物（２）のｐＨを測定し
たところそのゲルのｐＨは５．５であった。吸水性樹脂
組成物（２）を、２０゜C１６時間放置した後の可溶化程
度は、表１に示した通りであった。Example 2-0.1 g of L-ascorbic acid (special grade reagent manufactured by Katayama Chemical Co., Ltd.) was dissolved in 25 g of 0.9% sodium chloride aqueous solution with stirring. 1 g of the water-absorbent resin A was added to the thus-prepared ascorbic acid aqueous solution to obtain a water-absorbent resin composition (2). When the pH of the water absorbent resin composition (2) was measured, the pH of the gel was 5.5. The degree of solubilization of the water absorbent resin composition (2) after standing at 20 ° C. for 16 hours was as shown in Table 1.
【００２３】−実施例３− 脱イオン水９７．５ｇに１／１０規定塩酸２．５ｇ、Ｌ
−アスコルビン酸（片山化学工業株式会社製、特級試
薬）０．２５ｇを撹拌溶解させた。このように調製され
たアスコルビン酸水溶液に吸水性樹脂Ａを０．５ｇ添加
して吸水性樹脂組成物（３）を得た。吸水性樹脂組成物
（３）のｐＨを測定したところそのゲルのｐＨは４．４
であった。吸水性樹脂組成物（３）を、２０゜C２４時間
撹拌した後の可溶化程度は、表１に示した通りであっ
た。Example 3-2.5 g of 1/10 normal hydrochloric acid in 97.5 g of deionized water, L
-0.25 g of ascorbic acid (Katayama Chemical Co., Ltd., special grade reagent) was dissolved by stirring. Water absorbing resin A (0.5 g) was added to the thus-prepared ascorbic acid aqueous solution to obtain a water absorbing resin composition (3). When the pH of the water absorbent resin composition (3) was measured, the pH of the gel was 4.4.
Met. The degree of solubilization of the water absorbent resin composition (3) after stirring at 20 ° C. for 24 hours was as shown in Table 1.
【００２４】−実施例４− 脱イオン水９８．５ｇに１／１０規定水酸化ナトリウム
水溶液１．５ｇ、Ｌ−アスコルビン酸０．２５ｇを撹拌
溶解させた溶液に、吸水性樹脂Ａを０．５ｇ添加して吸
水性樹脂組成物（４）を得た。吸水性樹脂組成物（４）
のｐＨを測定したところそのゲルのｐＨは７．０であっ
た。吸水性樹脂組成物（４）を、２０゜C１６時間放置し
た後の可溶化程度は、表１に示した通りであった。Example 4-0.5 g of water-absorbent resin A was added to a solution of 1.5 g of a 1/10 normal sodium hydroxide solution and 0.25 g of L-ascorbic acid dissolved in 98.5 g of deionized water with stirring. Water-absorbent resin composition (4) was obtained by adding. Water absorbent resin composition (4)
When the pH of the gel was measured, the pH of the gel was 7.0. The degree of solubilization of the water absorbent resin composition (4) after standing for 16 hours at 20 ° C. is as shown in Table 1.
【００２５】−比較例１− 脱イオン水９５ｇに１／１０規定水酸化ナトリウム水溶
液５ｇ、Ｌ−アスコルビン酸０．２５ｇを撹拌溶解させ
た溶液に、吸水性樹脂Ａを１ｇ添加して比較吸水性樹脂
組成物（１）を得た。比較吸水性樹脂組成物（１）のｐ
Ｈを測定したところそのゲルのｐＨは１２であった。比
較吸水性樹脂組成物（１）を、２０゜C１６時間放置した
後の可溶化程度は、表１に示した通りであった。-Comparative Example 1-Comparative water absorption by adding 1 g of water absorbent resin A to a solution prepared by dissolving 5 g of a 1/10 normal sodium hydroxide aqueous solution and 0.25 g of L-ascorbic acid in 95 g of deionized water with stirring. A resin composition (1) was obtained. P of the comparative water absorbent resin composition (1)
When H was measured, the pH of the gel was 12. The solubilization degree of the comparative water absorbent resin composition (1) after standing at 20 ° C. for 16 hours was as shown in Table 1.
【００２６】−比較例２− 脱イオン水９５ｇに１０分の１規定塩酸５ｇ、Ｌ−アス
コルビン酸０．２５ｇを撹拌溶解させた溶液に、吸水性
樹脂Ａを１ｇ添加して比較吸水性樹脂組成物（２）を得
た。比較吸水性樹脂組成物（２）のｐＨを測定したとこ
ろそのゲルのｐＨは３．７であった。比較吸水性樹脂組
成物（２）を、２０゜C１６時間放置した後の可溶化程度
は、表１に示した通りであった。Comparative Example 2-Comparative water-absorbent resin composition by adding 1 g of water-absorbent resin A to a solution prepared by dissolving 5 g of 1/10 normal hydrochloric acid and 0.25 g of L-ascorbic acid in 95 g of deionized water with stirring. The product (2) was obtained. When the pH of the comparative water absorbent resin composition (2) was measured, the pH of the gel was 3.7. The degree of solubilization of the comparative water absorbent resin composition (2) after standing at 20 ° C. for 16 hours was as shown in Table 1.
【００２７】−比較例３− 脱イオン水１００ｇに吸水性樹脂Ａを１ｇ添加して比較
吸水性樹脂組成物（３）を得た。比較吸水性樹脂組成物
（３）のｐＨを測定したところそのゲルのｐＨは７．４
であった。比較吸水性樹脂組成物（３）を、２０゜C６０
時間放置した後の可溶化程度は、表１に示した通りであ
った。Comparative Example 3 1 g of the water absorbent resin A was added to 100 g of deionized water to obtain a comparative water absorbent resin composition (3). When the pH of the comparative water absorbent resin composition (3) was measured, the pH of the gel was 7.4.
Met. Comparative water-absorbent resin composition (3) at 20 ° C 60
The degree of solubilization after leaving for a time was as shown in Table 1.
【００２８】−比較例４− ０．９％塩化ナトリウム水溶液４９．５ｇとＬ−アスコ
ルビン酸０．５ｇからなる水溶液に水酸化ナトリウム水
溶液の粒を４粒を加えて撹拌溶解させた。このように調
製されたアスコルビン酸水溶液に吸水性樹脂（三洋化成
製「ＩＭ１０００」）を２ｇ添加して比較吸水性樹脂組
成物（４）を得た。比較吸水性樹脂組成物（４）のｐＨ
を測定したところそのゲルのｐＨは１０．６であった。
比較吸水性樹脂組成物（４）を、２０゜C１６時間放置し
た後の可溶化程度は、表１に示した通りであった。-Comparative Example 4-To an aqueous solution containing 49.5 g of 0.9% sodium chloride aqueous solution and 0.5 g of L-ascorbic acid, 4 particles of an aqueous sodium hydroxide solution were added and dissolved by stirring. 2 g of a water-absorbent resin (“IM1000” manufactured by Sanyo Kasei) was added to the thus-prepared aqueous ascorbic acid solution to obtain a comparative water-absorbent resin composition (4). PH of comparative water absorbent resin composition (4)
Was measured, the pH of the gel was 10.6.
The degree of solubilization of the comparative water absorbent resin composition (4) after standing at 20 ° C. for 16 hours was as shown in Table 1.
【００２９】[0029]
【表１】 [Table 1]
【００３０】表１にみられるように、Ｌ−アスコルビン
酸を添加しない（比較例３）と可溶化は進まない。ま
た、実施例１から４は効率よく可溶化しており、ｐＨの
範囲は４以上７．５以下である。As shown in Table 1, solubilization does not proceed unless L-ascorbic acid is added (Comparative Example 3). Further, Examples 1 to 4 are efficiently solubilized, and the pH range is 4 or more and 7.5 or less.
【００３１】[0031]
【発明の効果】本発明の吸水性樹脂組成物は、特にエネ
ルギーを加えることなく、これまで廃棄・分解・分離の
困難であった吸水性樹脂が、水系溶媒に可溶化する。ま
た、本発明の吸水性樹脂は、吸水時に水を保持し、廃棄
状態に於て経時的に分解する様に設計することも可能で
ある。INDUSTRIAL APPLICABILITY The water-absorbent resin composition of the present invention solubilizes a water-absorbent resin, which has been difficult to dispose, decompose and separate up to now, in an aqueous solvent without particularly applying energy. The water-absorbent resin of the present invention can also be designed to retain water when absorbing water and decompose over time in the discarded state.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０８Ｌ 35/00 ＬＨＲ 7921−4Ｊ 51/02 ＬＫＵ 7142−4Ｊ (72)発明者 下村 忠生 大阪府吹田市西御旅町５番８号 株式会社 日本触媒中央研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical display location C08L 35/00 LHR 7921-4J 51/02 LKU 7142-4J (72) Inventor Tadashi Shimomura Osaka Suita, Osaka Prefecture 5-8 Nishimitabicho, Yokohama
Claims (2)
ビン酸０．０１〜１重量部及び水１〜１０００重量部が
配合されてなり、且つ、ｐＨが４〜７．５の範囲にある
ことを特徴とする吸水性樹脂組成物。1. Water-absorbent resin 1 part by weight, ascorbic acid 0.01-1 part by weight and water 1-1000 parts by weight are blended, and pH is in the range of 4-7.5. A water-absorbent resin composition comprising:
吸水能力を有してなる請求項１記載の吸水性樹脂組成
物。2. The water-absorbent resin composition according to claim 1, wherein the water-absorbent resin has a water-absorbing capacity 10 to 1000 times its own weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04578892A JP3146053B2 (en) | 1992-03-03 | 1992-03-03 | Water-absorbing resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04578892A JP3146053B2 (en) | 1992-03-03 | 1992-03-03 | Water-absorbing resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05247307A true JPH05247307A (en) | 1993-09-24 |
| JP3146053B2 JP3146053B2 (en) | 2001-03-12 |
Family
ID=12729024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04578892A Expired - Fee Related JP3146053B2 (en) | 1992-03-03 | 1992-03-03 | Water-absorbing resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3146053B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019074099A1 (en) * | 2017-10-12 | 2019-04-18 | 住友精化株式会社 | Water-absorbent resin and absorbent article |
| WO2022080342A1 (en) * | 2020-10-15 | 2022-04-21 | 三洋化成工業株式会社 | Method for producing water-absorbing resin particles |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023149573A1 (en) * | 2022-02-04 | 2023-08-10 | 株式会社日本触媒 | Method for recycling water absorbent resin and method for producing water absorbent resin |
-
1992
- 1992-03-03 JP JP04578892A patent/JP3146053B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019074099A1 (en) * | 2017-10-12 | 2019-04-18 | 住友精化株式会社 | Water-absorbent resin and absorbent article |
| CN111225928A (en) * | 2017-10-12 | 2020-06-02 | 住友精化株式会社 | Water-absorbent resin and absorbent article |
| JPWO2019074099A1 (en) * | 2017-10-12 | 2020-11-05 | 住友精化株式会社 | Water-absorbent resin and absorbent articles |
| EP3696199A4 (en) * | 2017-10-12 | 2021-07-14 | Sumitomo Seika Chemicals Co., Ltd. | Water-absorbent resin and absorbent article |
| US11401357B2 (en) * | 2017-10-12 | 2022-08-02 | Sumitomo Seika Chemicals Co., Ltd. | Water-absorbent resin and absorbent article |
| WO2022080342A1 (en) * | 2020-10-15 | 2022-04-21 | 三洋化成工業株式会社 | Method for producing water-absorbing resin particles |
| CN116194208A (en) * | 2020-10-15 | 2023-05-30 | 三洋化成工业株式会社 | Method for producing water-absorbent resin particles |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3146053B2 (en) | 2001-03-12 |
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