US6130304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-absorbent or water-retention material and production method thereof
Assignee: Sanyo Chemical Industries Ltd
•
Filing: 1997-05-13
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Granted: 2000-10-10
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Expires: 2017-05-13
Abstract
Abstract The present invention can provide a water-absorbent or water-retention material comprising water-absorbent resin derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl alkyl (meth)acrylate, 1 to 60 wt. % of (meth)acrylic acid and/or alkali metal salt thereof and 0.00001 to 3 wt. % of crosslinking agent; and a water-absorbent or water-retention material comprising water-swellable polymer which is obtained by further thermally crosslinking a particles of partially alkaline neutralized product of a copolymer of 20 to 99 mol % of acrylamide and 1 to 80 mol % of acrylic acid. The water-absorbent or water-retention material of the present invention is not readily subject to an influence of salts, and the absorbency does not deteriorate with respect to an aqueous solution containing a great amount of metallic ion of salts.
Inventors
- 👤 Takashi Sumiya
- 👤 Masami Koike
- 👤 Yoji Fujiura
- 👤 Mihoko Nomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:58
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/04; C08F220/06; C08F220/10; C08F220/26; C08F220/28; C08F220/285; C08F220/286; C09; C09K; C09K17/00; C09K17/14; C09K17/18; C09K17/20; C09K17/22
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
91 words
A water-absorbent or water-retention material comprising a water-absorbent resin (A) obtained by an aqueous solution polymerization or by a reverse phase suspension polymerization and derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c); wherein at least a part of the (b) unit is neutralized.
Claim 2
Dependent Claim
91 words
A water-absorbent or water-retention material comprising a water-absorbent resin (A) obtained by an aqueous solution polymerization or by a reverse phase suspension polymerization and derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c); wherein at least a part of the (b) unit is neutralized.
Claim 3
Dependent Claim
32 words
A water-absorbent or water-retention material according to claim 1, wherein the monomer unit components further comprise another water soluble ethylenically unsaturated monomer in an amount of not more than 10% by weight.
Claim 4
Dependent Claim
89 words
The water-absorbent or water-retention material according to claim 1, wherein said water-absorbent resin (A) is a water-absorbent resin derived from monomer unit components comprising 60 to 95 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 5 to 40 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); 0.0001 to 1 wt. % of crosslinking agent (c); and optionally not more than 10 wt. % of another water soluble ethylenically unsaturated monomer (d).
Claim 5
Dependent Claim
29 words
The water-absorbent or water-retention material according to claim 1, wherein said hydroxyl group-containing water soluble mono-(meth)acrylate (a) is hydroxy alkyl (meth)acrylate having 2-3 carbon atoms in the alkyl group.
Claim 6
Dependent Claim
31 words
The water-absorbent or water-retention material according to claim 1, wherein the neutralization degree of the monomer (b) unit in said water-absorbent resin (A) is in the range from 60 to 100%.
Claim 7
Dependent Claim
77 words
A water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c); wherein said water-absorbent resin (A) has a hydrolysis resistant crosslinking structure.
Claim 8
Dependent Claim
77 words
A water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c); wherein said water-absorbent resin (A) has a hydrolysis resistant crosslinking structure.
Claim 9
Dependent Claim
32 words
A water-absorbent or water-retention material according to claim 6, wherein the monomer unit components further comprise another water soluble ethylenically unsaturated monomer in an amount of not more than 10% by weight.
Claim 10
Dependent Claim
18 words
The water-absorbent or water-retention material according to claim 6, wherein said crosslinking agent is a polyallyl ether compound.
Claim 11
Dependent Claim
50 words
The water-absorbent or water-retention material according to claim 1, wherein the absorbency of the water-absorbent resin (A) for 10 wt. % concentrated aqueous solution of calcium chloride is not less than 10 g/g and the gel elasticity of the water-absorbent resin (A) is not less than 50000 dyne/cm 2 .
Claim 12
Dependent Claim
76 words
A water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c); wherein the surface of the water-absorbent resin (A) is crosslinked.
Claim 13
Dependent Claim
76 words
A water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c); wherein the surface of the water-absorbent resin (A) is crosslinked.
Claim 14
Dependent Claim
32 words
A water-absorbent or water-retention material according to claim 10, wherein the monomer unit components further comprise another water soluble ethylenically unsaturated monomer in an amount of not more than 10% by weight.
Claim 15
Dependent Claim
77 words
A composition which comprises an aqueous liquid of polyvalent metal, and a water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c).
Claim 16
Dependent Claim
77 words
A composition which comprises an aqueous liquid of polyvalent metal, and a water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c).
Claim 17
Dependent Claim
32 words
A water-absorbent or water-retention material according to claim 12, wherein the monomer unit components further comprise another water soluble ethylenically unsaturated monomer in an amount of not more than 10% by weight.
Claim 18
Dependent Claim
14 words
A composition according to claim 12, wherein said aqueous liquid is a cement slurry.
Claim 19
Dependent Claim
25 words
An extrusion molded article comprising a water-absorbent resin and a cement, wherein said article is produced by extrusion molding of a composition of claim 12.
Claim 20
Dependent Claim
76 words
A composition which comprises rubber or rubber-like base material, and a water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c).
Claim 21
Dependent Claim
76 words
A composition which comprises rubber or rubber-like base material, and a water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); and 0.00001 to 3 wt. % of crosslinking agent (c).
Claim 22
Dependent Claim
32 words
A water-absorbent or water-retention material according to claim 16, wherein the monomer unit components further comprise another water soluble ethylenically unsaturated monomer in an amount of not more than 10% by weight.
Claim 23
Independent Claim
74 words
A method of retaining water, comprising adding to soil a water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); 0.00001 to 3 wt. % of crosslinking agent (c).
Claim 24
Independent Claim
74 words
A method of retaining water, comprising adding to soil a water-absorbent or water-retention material comprising a water-absorbent resin (A) derived from monomer unit components comprising 40 to 99 wt. % of hydroxyl group-containing water soluble mono-(meth)acrylate (a); 1 to 60 wt. % of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, alkali metal acrylate, and alkali metal methacrylate (b); 0.00001 to 3 wt. % of crosslinking agent (c).
Claim 25
Dependent Claim
32 words
A water-absorbent or water-retention material according to claim 18, wherein the monomer unit components further comprise another water soluble ethylenically unsaturated monomer in an amount of not more than 10% by weight.
References Cited (Backward Citations)
US3985697A
Cited
GB1534607A
Cited
JPS53104691A
Cited
JPS56161412A
Cited
JPS6136309A
Cited
JPH0445850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-10-10 | 2004-04-10 | 2004-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-10 | 2008-04-10 | 2008-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-10 | 2012-04-10 | 2012-10-10 | $7700.00 | Window Closed / Lapsed |