Process for producing improved super absorbent polymer
First Claim
1. A process for producing an improved super absorbent polymer comprising adding to a water-retained super absorbent polymer retaining 10 to 100 parts by weight of water per 100 parts by weight of the super absorbent polymer,(a) a hydrophilic polymer having two or more reactive groups selected from an amide group, a hydroxyl group, an amino group , an aldehyde group, a sulfo group and a carboxyl group, ora metallic compound of silicon, titanium or zirconium having two or more reactive groups selected from an alkoxyl group, a halogen group, an isocyanate group and an acyloxy group, in an amount of 0.005 to 5 parts by weight per 100 parts by weight of the super absorbent polymer, and(b) a crosslinking agent capable of reacting with the hydrophilic polymer or the metallic compound, provided that;
- the crosslinking agent for the hydrophilic polymer is at least one member selected from the group consisting of a polyglycidyl ether, a haloepoxy compound, a polyaldehyde, a polyol and a polyamine, andthe crosslinking agent for the metallic compound has two or more functional groups selected from a hydroxyl group, an epoxy group, a carboxyl group, an amino group and a thio group,at a weight ratio of the hydrophilic polymer or the metallic compound to the crosslinking agent of 0.1 to 30;
mixing; and
allowing the mixture to react by heating.
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Abstract
A process for producing an improved super absorbent polymer is disclosed. The process comprises adding to a water-retained super absorbent polymer retaining 10 to 100 parts by weight of water per 100 parts by weight of the super absorbent polymer, (a) a polyfunctional compound having two or more reactive groups and selected from a hydrophilic polymer or a metallic compound in an amount of 0.005 to 5 parts by weight per 100 parts by weight of the super absorbent polymer, and (b) a crosslinking agent having two or more functional groups capable of reacting with the polyfunctional compound at a weight ratio of the polyfunctional compound to the crosslinking agent of 0.1 to 30; mixing; and allowing the mixture to react by heating.
77 Citations
10 Claims
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1. A process for producing an improved super absorbent polymer comprising adding to a water-retained super absorbent polymer retaining 10 to 100 parts by weight of water per 100 parts by weight of the super absorbent polymer,
(a) a hydrophilic polymer having two or more reactive groups selected from an amide group, a hydroxyl group, an amino group , an aldehyde group, a sulfo group and a carboxyl group, or a metallic compound of silicon, titanium or zirconium having two or more reactive groups selected from an alkoxyl group, a halogen group, an isocyanate group and an acyloxy group, in an amount of 0.005 to 5 parts by weight per 100 parts by weight of the super absorbent polymer, and (b) a crosslinking agent capable of reacting with the hydrophilic polymer or the metallic compound, provided that; the crosslinking agent for the hydrophilic polymer is at least one member selected from the group consisting of a polyglycidyl ether, a haloepoxy compound, a polyaldehyde, a polyol and a polyamine, and the crosslinking agent for the metallic compound has two or more functional groups selected from a hydroxyl group, an epoxy group, a carboxyl group, an amino group and a thio group, at a weight ratio of the hydrophilic polymer or the metallic compound to the crosslinking agent of 0.1 to 30;
mixing; and
allowing the mixture to react by heating.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification
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- Resources
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Current AssigneeKAO Corporation
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Original AssigneeKAO Corporation
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InventorsWatanabe, Yoshihiko, Nambu, Hiromi, Igarashi, Tadashi, Umada, Akira, Amiya, Takayuki
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Primary Examiner(s)Marquis, Melvyn I.
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Assistant Examiner(s)AYLWARD, DAVID E
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Application NumberUS08/737,090Time in Patent Office867 DaysField of Search523/409, 523/408, 523/412, 524/400US Class Current523/412CPC Class CodesA61L 15/60 Liquid-swellable gel-formin...C08F 8/42 Introducing metal atoms or ...C08J 3/246 Intercrosslinking of at lea...
