EP0083022A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Water-absorbent resin having improved water-absorbency and improved water-dispersibility and process for producing same
Assignee: Sumitomo Seika Chemicals Co Ltd
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Filing: 1982-12-14
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Granted: —
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Expires: 2002-12-14
Abstract
Abstract Water-absorbent resins having improved water-absorbency, water-absorption rate and water-dispersibility can be produced by crosslinking a water-absorbent resin comprising a carboxylate as a constituent of the resin with a crosslinking agent having at least two functional groups in the presence of water in a proportion of 0.01 to 1.3 parts by weight per part by weight of the resin in an inert solvent.
Inventors
- 👤 Shigeji Obayashi
- 👤 Morio Nakamura
- 👤 Takushi Yamamoto
- 👤 Masato Fujikake
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 13:06
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/02; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08L63/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
64 words
1 . A process for producing a water-absorbent resin having an improved water-absorbency, characterized by crosslinking a water-absorbent resin comprising a carboxylate as a constituent of the resin with a crosslinking agent having at least two functional groups in the presence of water in a proportion of 0.01 to 1.3 parts by weight per part by weight of the resin in an inert solvent.
Claim 2
Dependent Claim
64 words
1 . A process for producing a water-absorbent resin having an improved water-absorbency, characterized by crosslinking a water-absorbent resin comprising a carboxylate as a constituent of the resin with a crosslinking agent having at least two functional groups in the presence of water in a proportion of 0.01 to 1.3 parts by weight per part by weight of the resin in an inert solvent.
Claim 3
Dependent Claim
22 words
A process according to Claim 1, wherein the water-absorbent resin is a polymer comprising an alkali acrylate or methacrylate as a constituent.
Claim 4
Dependent Claim
29 words
A process according to Claim 1, wherein the water is present in a proportion of 0.05 to 1.0 parts by weight per part by weight of the water-absorbent resin.
Claim 5
Dependent Claim
22 words
A process according to Claim 1, wherein the water-absorbent resin comprises a carboxylate and a hydroxyl group as constituents of the resin.
Claim 6
Dependent Claim
30 words
A process according to Claim 1, wherein the inert solvent is used in a proportion of 0.2 to 20 parts by weight per part by weight of the water-absorbent resin.
Claim 7
Dependent Claim
12 words
A process according to Claim 1, wherein the inert solvent is methanol.
Claim 8
Dependent Claim
12 words
A process according to Claim 1, wherein the inert solvent is cyclohexane.
Claim 9
Dependent Claim
12 words
A process according to Claim 1, wherein the inert solvent is n-heptane.
Claim 10
Dependent Claim
17 words
9 . A process according to Claim 1, wherein the crosslinking agent is a diglycidyl ether compound.
Claim 11
Dependent Claim
31 words
A process according to Claim 9, wherein the crosslinking agent is ethylene glycol diglycidyl ether. ll. A water-absorbent resin having an improved water-absorbency obtained by the process according to Claim 1.
References Cited (Backward Citations)
No citation records indexed.
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