[특허]Water-absorbing agent and its production process

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-020/02
출원번호	UP-0373215 (2006-03-13)
등록번호	US-7750085 (2010-07-26)
우선권정보	JP-2005-071104(2005-03-14); JP-2006-031177(2006-02-08)
발명자 / 주소	Torii, Kazushi Kadonaga, Kenji Shibata, Hirofumi Iwamura, Taku Kimura, Kazuki Miyake, Koji Nogi, Kozo
출원인 / 주소	Nippon Shokubai Co., Ltd.
대리인 / 주소	Harness, Dickey & Pierce, P.L.C.
인용정보	피인용 횟수 : 7 인용 특허 : 30

초록 ▼

A water-absorbing agent according to the present invention includes water-absorbent resin particles having an internal cross-linked structure, wherein a vicinity of a surface of the water-absorbent resin particle is cross-linked with a surface cross-linking agent, and the water-absorbent resin parti

A water-absorbing agent according to the present invention includes water-absorbent resin particles having an internal cross-linked structure, wherein a vicinity of a surface of the water-absorbent resin particle is cross-linked with a surface cross-linking agent, and the water-absorbent resin particle has therein a sea-island structure having (i) part containing a first water-soluble multivalent metal salt such as aluminum sulfate and (ii) part not containing the first water-soluble multivalent metal salt. With this arrangement, it is possible to provide a water-absorbing agent having less water-soluble component content, more excellent liquid permeability, and more excellent water retention under pressure than the conventional water-absorbing agent.

대표청구항 ▼

What is claimed is: 1. A production process for a water-absorbing agent containing water-absorbent resin particles having an internal cross-linked structure obtained by polymerizing a water-soluble unsaturated monomer, the production process comprising the steps of: (A) forming non-surface-treated

What is claimed is: 1. A production process for a water-absorbing agent containing water-absorbent resin particles having an internal cross-linked structure obtained by polymerizing a water-soluble unsaturated monomer, the production process comprising the steps of: (A) forming non-surface-treated water-absorbent resin particles having an internal cross-linked structure obtained by polymerizing the water-soluble unsaturated monomer in the presence of a covalent bonding cross-linking agent; (B) obtaining surface treated water-absorbent resin fine particles by reacting resin fine particles in the presence of a surface-cross-linking agent; and (C) causing the surface-treated water-absorbent resin fine particles to be contained in the non-surface-treated water-absorbent resin particles. 2. The production process according to claim 1, wherein; a mass ratio of the non-surface-treated water-absorbent resin particles and the surface-treated water-absorbent resin fine particles ranges from 99:1 to 50:50. 3. A water-absorbing agent obtained in the production process for a water-absorbing agent according to claim 2. 4. The production process according to claim 1, further comprising the step of: (D) heating non-surface-treated water-absorbent resin particles having the surface-treated water-absorbent resin fine particles contained therein, or mixing water-absorbent resin particles having the surface-treated water-absorbent resin fine particles contained therein with a second surface cross-linking agent and then heating a resultant mixture, so as to cross-link vicinities of surfaces of the water-absorbent resin particles. 5. The production process according to claim 4, wherein: the step (D) is the following step (d): (d) heating water-absorbent resin particles having a first water-soluble multivalent metal salt contained therein, or mixing the water-absorbent resin particles having the first water-soluble multivalent metal salt contained therein with the second surface cross-linking agent and then heating a resultant mixture, so as to cross-link vicinities of surfaces of the water-absorbent resin particles. 6. The production process according to claim 5, further comprising the step of: (e) adding a second water-soluble multivalent metal salt to surfaces of the water-absorbent resin particles obtained in the step (d). 7. The production process according to claim 6, wherein: in the step (c), a content of the first water-soluble multivalent metal salt in the water-absorbent resin particles ranges from 0.001 to 1 mass %, with respect to 100 parts by mass of the water-absorbent resin particles; in the step (e), the amount of the second water-soluble multivalent metal salt added ranges from 0.001 to 4 mass %, with respect to 100 parts by mass of the water-absorbent resin particles; and the content of the first water-soluble multivalent metal salt is less than the amount of the second water-soluble multivalent metal salt added. 8. The production process according to claim 6, wherein: the first water-soluble multivalent metal salt and the second water-soluble multivalent metal salt each include aluminum. 9. The production process according to claim 5, wherein: the surface cross-linking agent used in the step (d) includes polyhydric alcohol. 10. The production process according to claim 1, wherein: the steps (A) and (C) are respectively the following steps (a) and (c): (a) step of forming water-absorbent resin particles not containing first water-soluble multivalent metal salt, the water-absorbent resin particles having an internal cross-linked structure and being obtained by polymerizing a water-soluble unsaturated monomer in the presence of a covalent bonding cross-linking agent; and (c) step of causing water-absorbent resin fine particles containing the first water-soluble multivalent metal salt to be contained in the water-absorbent resin particles not containing the first water-soluble multivalent metal salt. 11. The production process according to claim 10, wherein: the water-absorbent resin fine particles including the first water-soluble multivalent metal salt are so small in size as to pass through a sieve having a mesh size of 300 μm. 12. The production process according to claim 10, wherein: the step (c) is realized by agglomeration of the water-absorbent resin particles formed in the step (a) and the water-absorbent resin fine particles containing the first water-soluble multivalent metal salt. 13. The production process according to claim 12, wherein: the agglomeration is performed in the presence of water. 14. The production process according to claim 10, wherein: the step (a) and step (c) are a step of, by polymerizing a water-soluble unsaturated monomer in the presence of a covalent bonding cross-linking agent before and/or during the addition of the water-absorbent resin fine particles containing the first water-soluble multivalent metal salt, forming water-absorbent resin particles not containing the first water-soluble multivalent metal salt and having an internal cross-linked structure. 15. The production process according to claim 10, wherein: the step (c) is realized by mixing a hydrogel water-absorbent resin having a moisture content of not less than 20 mass % and the water-absorbent resin fine particles containing the first water-soluble multivalent metal salt. 16. A water-absorbing agent obtained in the production process for a water-absorbing agent according to claim 1.

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