Claims
- 1. A liquid absorption agent for water or organic solvents comprising a crosslinked N-vinylcarboxylic acid amide resin comprising repeating units of the formula shown below, crosslinked with a crosslinking agent: ##STR3## wherein R.sup.1, R.sup.2, and R.sup.3 independently represent a hydrogen atom or methyl;
- X represents a group --COOY, where Y represents a hydrogen atom, an alkali metal, a C.sub.1 -C.sub.6 alkyl, or a lower alkyl substituted with a hydroxyl, a dialkylamino or a quaternary ammonium group; a group --CONHZ, where Z represents a hydrogen atom or a lower alkyl substituted with a dialkylamino group, a quaternary ammonium group, a sulfonic acid or an alkali metal salt thereof; a cyano, a 2-ketopyrrolidinyl, a lower alkoxy, a lower acyl, a lower acyloxy or a lower alkyl substituted with sulfonic acid or an alkali metal salt thereof, with a proviso that when R.sup.3 is a methyl, X is not a cyano, a 2-ketopyrrolidinyl, a lower alkoxy, a lower acyl, a lower acyloxy and a lower alkyl substituted with sulfonic acid or a salt thereof;
- M represents a hydrogen atom or an alkali metal;
- p represents 0 or 1; and the molar ratio of m:n is 50-100:50-0,
- said crosslinking agent comprising, as an essential constituent, at least one compound selected from the group consisting of N,N'-.alpha.,.omega.-lower alkylenebis (N-vinylcarboxylic acid amides), N,N'-(diacetyl)-N,N'-(divinyl)-.alpha.,.omega.-diaminopolyethers and xylylene bis (N-vinylcarboxylic acid amides), the amount of the crosslinking agent being 2.times.10.sup.-4 mol % to 0.2 mol %, based on the (co)polymerized component.
- 2. A liquid absorption agent as claimed in claim 1, wherein the average polymerization degree is 100 to 500,000 and the crosslinking density is 1/1000 to 1/500,000.
- 3. A liquid absorption agent as claimed in claim 1, wherein the crosslinking agent is at least one compound selected from the group consisting of N,N'-1,4-butylenebis(N-vinylacetamide), N,N'-1,6-hexylenebis(N-vinylacetamide), N,N-1,10-decylenebis(N-vinylacetamide), N,N'-3-oxa-1,5-pentylenebis(N-vinylacetamide), N,N'-3,6-dioxa-1,8-octylenebis(N-vinylacetamide), N,N'-p-xylylenebis(N-vinylacetamide), and N,N'-diacetyl-N,N'-divinyl-1,4-bisaminomethylcyclohexane.
- 4. A liquid absorption agent as claimed in claim 1, wherein the organic solvent is a single solvent having a solvent polarity parameter E.sub.T of 45 or more on a solvent mixture of a solvent polarity parameter E.sub.T of 43 or more.
- 5. A liquid absorption agent as claimed in claim 1, for use as a water retention or supply agent in a vegetative soil or an artificial medium.
- 6. A liquid absorption agent as claimed in claim 1, for use as a body fluid absorbent in sanitary articles.
- 7. A liquid absorption agent as claimed in claim 1, for use as an absorbent for water having a high calcium component for a concrete curing agent, cement modifier, or humectant.
- 8. A liquid absorption agent as claimed in claim 1, for use as a dispersing agent of a metal salt solution or a complex forming agent with metal compound.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-230550 |
Sep 1990 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 07/701,911 filed May 17, 1991 now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0068159 |
May 1982 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
701911 |
May 1991 |
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