EP0055848A2
Expired / Lapsed
EP
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A water-absorbing rubber composition
Assignee: Kuraray Co Ltd
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Filing: 1981-12-23
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Granted: —
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Expires: 2001-12-23
Abstract
Abstract A water-absorbing rubber composition comprising (A) a 1,3-diene rubber with a crystal or glass region content as measured at an ordinary temperature of 5-50% and (B) a highly water-absorbing resin dispersed in the said rubber, the said highly water-absorbing resin being a product of crosslinking of a polymer which contains as monomer component thereof at least 40 mole percent of an a,p-unsaturated compound containing 1 or 2 groups each selected from the class consisting of a carboxyl group and a group convertible to a carboxyl group with at least one crosslinking agent selected from the class consisting of a polyfunctional epoxy compound and a polyamine, the resin being in the form of a powder capable of passing through a 20-mesh Tyler screen and absorbing 20-500 times its own weight of distilled water. The composition can absorb water rapidly and produce a high swelling pressure, and has good durability in the swollen state.
Inventors
- 👤 Yoshihiro Yoshioka
- 👤 Hiroshi Harima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 18:18
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C08; C08L; C08L21/00; C09K2003/1034; C09K2003/1046; C09K2200/00; C09K2200/06; C09K2200/0607; C09K2200/0645
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A water-absorbing rubber composition comprising (A) a 1,3-diene rubber with a crystal or glass region content as measured at an ordinary temperature' of 5-50%, and (B) a highly water-absorbing resin dispersed in the rubber, the said highly water-absorbing resin being a product of crosslinking of a polymer which contains as a monomer component therof at least 40 mole percent of an α,β-unsaturated compound containing 1 or 2 groups each selected from the class consisting of a carboxyl group and a group convertible to a carboxyl group with at least one crosslinking agent selected from the class consisting of a polyfunctional epoxy compound and a polyamine, the said resin being in the form of a powder capable of passing through a 20-mesh Tyler screen and absorbing 20-500 times its own weight of distilled water.
Claim 2
Dependent Claim
133 words
A water-absorbing rubber composition comprising (A) a 1,3-diene rubber with a crystal or glass region content as measured at an ordinary temperature' of 5-50%, and (B) a highly water-absorbing resin dispersed in the rubber, the said highly water-absorbing resin being a product of crosslinking of a polymer which contains as a monomer component therof at least 40 mole percent of an α,β-unsaturated compound containing 1 or 2 groups each selected from the class consisting of a carboxyl group and a group convertible to a carboxyl group with at least one crosslinking agent selected from the class consisting of a polyfunctional epoxy compound and a polyamine, the said resin being in the form of a powder capable of passing through a 20-mesh Tyler screen and absorbing 20-500 times its own weight of distilled water.
Claim 3
Dependent Claim
28 words
The water-absorbing rubber composition of Claim 1, wherein the said 1,3-diene rubber with a crystal region content as measured at an ordinary temperature of 5-50% is chloroprene rubber.
Claim 4
Dependent Claim
25 words
The water-absorbing rubber composition of Claim 2, wherein the said chloroprene rubber has a crystal region content as measured at an ordinary temperature of 15-35%.
Claim 5
Dependent Claim
92 words
The water-absorbing rubber composition of Claim 1, wherein the said 1,3-diene rubber with a glass region content as measured at an ordinary temperature of 5-50% is a block copolymer of the type A-B-A wherein A is a polymer segment composed of a monovinyl-substituted aromatic compound and having a glass transition temperature of at lowest 70°C and a degree of polymerization of 10-2,500 and B is a noncrystalline polymer segment composed of a 1,3-diene and having a degree of polymerization of 500-15,000, the A segments amounting to 5-50% of the whole rubber component.
Claim 6
Dependent Claim
36 words
The water-absorbing rubber composition according to any of claims 1 to 4 wherein the highly water-absorbing resin is a reaction product of a maleic anhydride-containing copolymer and a basic substance, crosslinked with a polyfunctional epoxy compound.
Claim 7
Dependent Claim
32 words
The water-absorbing rubber composition according to any of claims 1 to 4 wherein the highly water-absorbing resin is a polyamine crosslinked reaction product of a maleic anhydride-containing copolymer and a basic substance.
Claim 8
Dependent Claim
19 words
The water-absorbing rubber composition of claim 5 or 6, wherein the maleic anhydride-containing copolymer is an alpha-olefin-maleic anhydride copolymer.
Claim 9
Dependent Claim
23 words
The water-absorbing rubber composition of claim 5 or 6, wherein the alpha-olefin-maleic anhydride copolymer is an alternating copolymer of isobutylene and maleic anhydride.
Claim 10
Dependent Claim
45 words
The water-absorbing rubber composition of claim 5 or 6, wherein the maleic anhydride-containing copolymer is a copolymer of maleic anhydride and at least one comonomer selected from the group consisting of styrene, vinyl acetate, methyl vinyl ether, acrylic acid ester, methacrylic acid ester and acrylonitrile.
Claim 11
Dependent Claim
44 words
The water-absorbing rubber composition according to any of claims 1 to 4, wherein the highly water-absorbing resin is a polyacrylic acid alkali metal salt crosslinked with at least one crosslinking agent selected from the group consisting of a polyfunctional epoxy compound and a polyamine.
Claim 12
Dependent Claim
17 words
The water-absorbing rubber composition of claim 1, wherein the polyfunctional epoxy compound is a glycerol diglycidyl ether.
Claim 13
Dependent Claim
21 words
The water-absorbing rubber composition of claim 1, wherein the polyamine is polyethyleneimine having a molecular weight of not more than 5,000.
Claim 14
Dependent Claim
24 words
The water-absorbing rubber composition of claim 1, wherein the highly water-absorbing resin is capable of absorbing 50-300 times its own weight of distilled water.
Claim 15
Dependent Claim
52 words
The water-absorbing rubber composition according to any of claims 1 to 13, wherein the amount of the highly water-absorbing resin (B) is 10-300 parts by weight per 100 parts by weight of the 1,3-diene rubber (A) with a crystal or glass region content as measured at an ordinary temperature of 5-50 %.
Claim 16
Dependent Claim
16 words
A water leak stopper which is predominantly composed of the water-absorbing rubber composition of claim 1.
References Cited (Backward Citations)
No citation records indexed.
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