JP3146053B2 - Water-absorbing resin composition - Google Patents
Water-absorbing resin compositionInfo
- Publication number
- JP3146053B2 JP3146053B2 JP04578892A JP4578892A JP3146053B2 JP 3146053 B2 JP3146053 B2 JP 3146053B2 JP 04578892 A JP04578892 A JP 04578892A JP 4578892 A JP4578892 A JP 4578892A JP 3146053 B2 JP3146053 B2 JP 3146053B2
- 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.)
- Expired - Fee Related
Links
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。The present invention relates to a water-absorbing resin composition. More specifically, the present invention relates to a water-absorbent resin composition in which a water-absorbent resin is solubilized in an aqueous solvent when left 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 Recently, 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. After use, the absorbent articles are discarded by incineration or burying in the soil, but when buried in the soil, most of the water-absorbing resin used is a synthetic polymer. The later water-absorbent resin is hard to decompose and remains in the soil for a long time. Such a phenomenon may become a serious problem due to the close-up of environmental problems in the future.
【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, it has been proposed to recycle the water-absorbent resin after water absorption for incineration or composting. However, incineration requires a large amount of equipment and labor costs, and is economically and energy-efficient. However, problems such as unfavorable problems remain. In addition, in the case of compost with low equipment cost and labor cost, it may be preferable that the water-absorbing resin is solubilized. The purpose of the present invention is usually, the water-absorbent resin after water absorption is difficult to dispose, decompose and separate, solubilized in an aqueous solvent,
An object of the present invention is to provide a water-absorbent resin composition that is easy to dispose, decompose, separate and reuse.
【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 present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found a water-absorbing 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０．１〜１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の範囲にあることを特徴とする、吸水性樹脂可溶
化組成物（以下、本明細書ではこれを、単に「吸水性樹
脂組成物」と言うことが多い）である。That is, the present invention relates to 0.1 to 1 part by weight of ascorbic acid and 1 to 1 part by weight of a water-absorbent resin.
1000 parts by weight, and the pH is 4 to
Water -soluble resin -soluble , characterized by being in the range of 7.5
Of the composition (hereinafter, referred to herein as simply "water absorbent tree
Fat composition ") .
【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-absorbing resin is a water-insoluble substance that absorbs a large amount of water and swells in water to form a hydrogel. Preferably, 10 to 1 of its own weight
Such a water-absorbing resin is, for example, a crosslinked product of a hydrolyzate of a starch-acrylonitrile graft copolymer and a crosslinked product of a neutralized product of a starch-acrylic acid graft copolymer. , A crosslinked product of an acrylate-vinyl acetate copolymer, a crosslinked product of a hydrolyzate of an acrylamide polymer, a crosslinked product of a partially neutralized product of an acrylic acid polymer, and a crosslinked product of an isobutylene-maleic acid copolymer Crosslinked bodies and the like can be mentioned. In the present invention, the ascorbic acid is, for example, L-ascorbic acid, isoascorbic acid and the like. Among them, 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、０．１重量部以上１重量
部以下である。アスコルビン酸の量が、０．１重量部未
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。In the present invention, the amount of ascorbic acid is
0.1 part by weight or more and 1 part by weight or less based on 1 part by weight of the water absorbent resin. When the amount of ascorbic acid is less than 0.1 part by weight , it does not become a substantially effective amount, and the effect of solubilizing the water-absorbing resin is reduced. Not only is it not possible to obtain the appropriate effect, but also the water-absorbent resin after absorbing water 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 based on 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. Even before the addition of water, the water-absorbing resin may contain various components contained in body fluids 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。[0009] The pH of the water-absorbent resin composition of the present invention must be in the range of 4 to 7.5. Outside this range, the efficiency of solubilization is significantly reduced and little is solubilized. Therefore, the pH of the water absorbent resin composition is particularly important in the present invention. In adjusting the pH of the water-absorbent resin composition of the present invention, a pH adjuster may be used in combination. The pH adjuster is a common acid or base and sufficiently fulfills its role, 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 amounts 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 aqueous solution of ascorbic acid) to a water-absorbent resin, a method of adding water to a mixture of a water-absorbent resin and ascorbic acid, and the like. There is.
【００１１】 吸水性樹脂１重量部に対して、アスコル
ビン酸０．１〜１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可溶化組成物は、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
マー鎖が切断・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。[0011] The present invention wherein 0.1 to 1 part by weight of ascorbic acid and 1 to 1000 parts by weight of water are blended with respect to 1 part by weight of a water-absorbent resin, and the pH is in the range of 4 to 7.5. In the water-absorbent resin solubilizing composition, usually, after the water-absorbent resin in the composition absorbs water and assumes a gel state, the polymer chain is cut and has a low molecular weight over time, and is solubilized in an aqueous solvent.
However, depending on the conditions, it may be expected that the water-absorbent resin will be solubilized from the surface before it assumes a gel state.
【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。In 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 exceeding 150 ° C., so that the temperature should be 150 ° C. or less, preferably 100 ° C. or less. It is also preferable to set the temperature to such a degree that the water absorbent resin is not solidified. Specifically, it is 0 ° or more, preferably 15 ° or more, and particularly preferably room temperature. In addition, under the influence of a third component, for example, a metal ion, for example, a copper ion, the generation of radicals may be activated to promote self-solubilization. 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。[0013] Such solubilization is attributable to the reduction of the molecular weight of the water-absorbing resin, but the molecular weight of the solubilized product can be controlled by selecting the processing 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, “%” means “% by weight”, and “parts” means “parts 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 Content A solution prepared by dispersing 0.5 g of a water-absorbent resin in deionized water is added to 10
After 00 g for a predetermined time, the solution was filtered through filter paper, and the amount of solids in the filtrate was measured by titration to determine the water-soluble content 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 state was 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。×: The composition becomes a hydrogel and has 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-absorbing resin-74.95 mol% of sodium acrylate, acrylic acid 2
37% of an acrylate monomer composed of 5 mol% and 0.05 mol% of trimethylolpropane triacrylate
4000 parts of an aqueous solution containing 2.0 parts of ammonium persulfate and 0.08 parts of L-ascorbic acid in a nitrogen atmosphere.
Polymerization was carried out at 0 to 80 ° C. to obtain a gel-like water-containing crosslinked polymer. The obtained hydrogel crosslinked polymer was dried by hot-air drying at 150 ° C., and then pulverized by a hammer mill to obtain a water-absorbent resin A having passed through a 20-mesh 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 consisting of 49.5 g of a 0.9% aqueous sodium chloride solution and 0.5 g of L-ascorbic acid, and dissolved by stirring. The aqueous solution of ascorbic acid prepared as described above is mixed with a water-absorbing resin (“I
M1000 ") and water-absorbent resin composition (1)
I 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 of the water-absorbent resin composition (1) after standing 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 (Katayama Chemical Industry Co., Ltd., special grade reagent) was stirred and dissolved in 25 g of 0.9% aqueous sodium chloride solution. 1 g of the water-absorbing resin A was added to the aqueous solution of ascorbic acid prepared in this manner, to obtain a water-absorbing 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 Industry Co., Ltd., special grade reagent) was stirred and dissolved. 0.5 g of the water-absorbing resin A was added to the ascorbic acid aqueous solution thus prepared 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 found to be 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 prepared by stirring and dissolving 1.5 g of a 1/10 normal aqueous sodium hydroxide solution and 0.25 g of L-ascorbic acid in 98.5 g of deionized water. This was added to obtain a water absorbent resin composition (4). Water absorbent resin composition (4)
Was measured, and the pH of the gel was 7.0. The degree of solubilization of the water-absorbent resin composition (4) after standing at 20 ° C. for 16 hours was 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 1 g of a water-absorbing resin A was added to a solution prepared by stirring and dissolving 5 g of a 1/10 normal aqueous sodium hydroxide solution and 0.25 g of L-ascorbic acid in 95 g of deionized water. A resin composition (1) was obtained. P of comparative water-absorbent resin composition (1)
When the H was measured, the pH of the gel was 12. The degree of solubilization 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 was prepared by adding 1 g of water-absorbent resin A to a solution prepared by stirring and dissolving 5 g of 1/10 normal hydrochloric acid and 0.25 g of L-ascorbic acid in 95 g of deionized water. 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 A comparative water-absorbent resin composition (3) was obtained by adding 1 g of the water-absorbent resin A to 100 g of deionized water. When the pH of the comparative water absorbent resin composition (3) was measured, the pH of the gel was 7.4.
Met. The comparative water-absorbent resin composition (3) was prepared at 20 ° C.
The degree of solubilization after standing 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 Four particles of an aqueous sodium hydroxide solution were added to an aqueous solution consisting of 49.5 g of a 0.9% aqueous sodium chloride solution and 0.5 g of L-ascorbic acid, followed by stirring and dissolving. To the aqueous solution of ascorbic acid thus prepared, 2 g of a water-absorbent resin (“IM1000” manufactured by Sanyo Chemical Industries, Ltd.) was added to obtain a comparative water-absorbent resin composition (4). PH of comparative water absorbent resin composition (4)
Was measured, and 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。According to the water-absorbent resin composition of the present invention, a water-absorbent resin which has been difficult to dispose, decompose and separate before can be solubilized in an aqueous solvent without adding energy. Further, the water-absorbent resin of the present invention can be designed so that it retains water when absorbing water and decomposes with time in a discarded state.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０８Ｌ 35/00 Ｃ０８Ｌ 35/00 51/02 51/02 (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 (56)参考文献 特開 昭63−118375（ＪＰ，Ａ) 特開 平５−1199（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C08L 33/02 C08K 3/20 C08K 5/04 C08L 29/04 C08L 33/26 C08L 35/00 C08L 51/02 ────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. 7 Identification code FI C08L 35/00 C08L 35/00 51/02 51/02 (72) Inventor Tadao Shimomura 5-8 Nishiminaburicho, Suita-shi, Osaka (56) References JP-A-63-118375 (JP, A) JP-A-5-1199 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) ) C08L 33/02 C08K 3/20 C08K 5/04 C08L 29/04 C08L 33/26 C08L 35/00 C08L 51/02
Claims (2)
ビン酸０．１〜１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、
吸水性樹脂可溶化組成物。1. A mixture of 0.1 to 1 part by weight of ascorbic acid and 1 to 1000 parts by weight of water with respect to 1 part by weight of a water-absorbent resin, and the pH is in a range of 4 to 7.5. ,
A water-absorbing resin solubilizing composition.
吸水能力を有してなる、請求項１に記載の吸水性樹脂可
溶化組成物。2. A water-absorbent resin is a 10 to 1000 times the water absorption capacity of its own weight, the water-absorbing resin Friendly claim 1
Solubilized composition.
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 JPH05247307A (en) | 1993-09-24 |
| JP3146053B2 true 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 (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 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI687443B (en) * | 2017-10-12 | 2020-03-11 | 日商住友精化股份有限公司 | Water-absorbing resin and absorbent articles |
| 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 |
-
1992
- 1992-03-03 JP JP04578892A patent/JP3146053B2/en not_active Expired - Fee Related
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05247307A (en) | 1993-09-24 |
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