US4865886A
Expired / Lapsed
US
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Process for preparation of water absorptive composite material
Assignee: Mitsubishi Chemical Corp
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Filing: 1987-08-24
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Granted: 1989-09-12
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Expires: 2007-08-24
Abstract
Abstract There is provided a process for preparing a water absorptive composite material, which comprises the combination of the following steps of: (A) applying an aqueous solution of a polymerizable monomer comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, to a prefabricated fibrous substrate; (B) polymerizing the polymerizable monomers applied to said fibrous substrate to form a composite of a polymer derived from said polymerizable monomer and said fibrous substrate; and (C) adding to said composite a crosslinking agent having two or more functional groups reactive with the carboxyl groups and/or carboxylate groups contained in the polymer to react therewith.
Inventors
- 👤 Kiichi Itoh
- 👤 Takeshi Shibano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:25
CPC Classifications
D; D06; D06M; D06M14/00; D06M14/02; D06M14/04; D06M14/08; D06M14/12; D06M14/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
115 words
A process for preparing a water absorptive composite material, which comprises the combination of the following steps of: (A) applying an aqueous solution of a polymerizable monomer comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, to a prefabricated fibrous substrate; (B) polymerizing the polymerizable monomers applied to said fibrous substrate to form a composite of a polymer derived from said polymerizable monomer and said fibrous substrate; and (C) adding to said composite a crosslinking agent having two or more functional groups reactive with the carboxyl group and/or carboxylate group contained in the polymer to react therewith.
Claim 2
Dependent Claim
115 words
A process for preparing a water absorptive composite material, which comprises the combination of the following steps of: (A) applying an aqueous solution of a polymerizable monomer comprising as a main component acrylic acid, of which 20% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt, to a prefabricated fibrous substrate; (B) polymerizing the polymerizable monomers applied to said fibrous substrate to form a composite of a polymer derived from said polymerizable monomer and said fibrous substrate; and (C) adding to said composite a crosslinking agent having two or more functional groups reactive with the carboxyl group and/or carboxylate group contained in the polymer to react therewith.
Claim 3
Dependent Claim
33 words
A process according to claim 1, wherein the polymerizable monomer comprises acrylic acid of which 50% or more of the carboxyl groups have been neutralized to its alkali metal salt or ammonium salt.
Claim 4
Dependent Claim
78 words
A process according to claim 1, wherein the polymerizable monomer contains up to 20 mol % of at least one of the monomers selected from the group consisting of 2-acrylamide-2-methylpropanesulfonic acid, 2acryloylethanesulfonic acid, 2-acryloylpropanesulfonic acid, methacrylic acid and alkali metal salts or ammonium salts thereof, acrylamide, methacrylamide, N,N-dimethylacrylamide, N,N-dimethylmethacrylamide, 2 -hydroxyethyl acrylamide, 2-hydroxyethyl methacrylamide, 2-vinylpyridine, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, polyethylene glycol monoacrylate, polyethylene glycol monomethacrylate, N,N'-methylenebisacrylamide, N,N'-methylenebismethacrylamide, polyethylene glycol diacrylate and polyethylene glycol dimethacrylate.
Claim 5
Dependent Claim
37 words
A process according to claim 1, wherein the fibrous substrate formed in step (A) comprises as a main component a fiber selected from the group consisting of a cellulose fiber, a polyester fiber and a mixture thereof.
Claim 6
Dependent Claim
34 words
A process according to claim 1, wherein the fibrous substrate is a pad of loose fabric, a carded web, an air-laid web, a paper, a nonwoven fabric, a woven fabric or a knitted fabric.
Claim 7
Dependent Claim
47 words
A process according to claim 1, wherein the stage of applying the aqueous solution of the polymerizable monomer in the step (A) to the prefabricated fibrous substrate comprises spraying of said aqueous solution to said fibrous substrate or impregnation of said fibrous substrate with said aqueous solution.
Claim 8
Dependent Claim
40 words
A process according to claim 1, wherein the amount of the polymerizable monomer applied to the fibrous substrate in the step (A) is in a proportion of 1-10,000 parts by weight per 100 parts by weight of the fibrous substrate.
Claim 9
Dependent Claim
25 words
A process according to claim 1, wherein the polymerization in the steps (B) is conducted by the action of a water soluble radical polymerization initiator.
Claim 10
Dependent Claim
66 words
A process according to claim 8, wherein the stage of polymerizing the polymerizable monomer in the step (B) by means of the water soluble radical polymerization initiator involves the decomposition of said polymerization initiator while it is previously dissolved in the aqueous solution of the monomer for polymerization, or the spraying of said polymerization initiator in a solution form to the fibrous substrate before decomposition thereof.
Claim 11
Dependent Claim
40 words
A process according to claim 1, wherein the composite to be treated in the step (C) contains water in a proportion of 0.01 to 10 parts by weight per part by weight of the polymer derived from the polymerizable monomer.
Claim 12
Dependent Claim
30 words
A process according to claim 1, wherein the crosslinking agent added in the step (C) has glycidyl groups as the functional groups reactive with the carboxyl group and/or carboxylate group.
Claim 13
Dependent Claim
17 words
A process according to claim 11, wherein the crosslinking agent having glycidyl groups is a polyglycidyl ether.
Claim 14
Dependent Claim
41 words
A process according to claim 12, wherein the polyglycidyl ether is an alkylene or polyalkylene glycol diglycidyl ether wherein the alkylene group has 2 to 4 carbon atoms and the degree of poly in the polyalkylene glycol is 2 to 3.
References Cited (Backward Citations)
US3056695A
Cited
US4008353A
Cited
US3995998A
Cited
US4072784A
Cited
US4304564A
Cited
US4541871A
Cited
US4647617A
Cited
GB2176815A
Cited
US4721647A
Cited
JPH116267A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |