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US4590227A
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Water-swellable elastomer composition
Assignee: Sumitomo Seika Chemicals Co Ltd
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Filing: 1984-10-24
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Granted: 1986-05-20
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Expires: 2004-10-24
Abstract
Abstract Water-swellable elastomer composition consisting essentially of a homogeneous mixture of an elastomer, a water-absorbent resin and a water-soluble resin. Said composition exhibits a high degree of swelling and a high swelling rate when it is soaked in water. Also, said composition retains swellability even when it is put in contact with water for a long period of time.
Inventors
- 👤 Morio Nakamura
- 👤 Shigeji Obayashi
- 👤 Shinichi Takemori
- 👤 Hitoshi Tanaka
- 👤 Motomu Hirakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:57
CPC Classifications
C; C08; C08L; C08L21/00; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; A61L15/42; A61L15/60; C08L51/00; C08L51/02
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
75 words
A water-swellable elastomer composition consisting essentially of a homogeneous mixture of an elastomer 5-300 parts by weight of a water-absorbent resin per 100 parts by weight of the elastomer and wherein said water-absorbent resin absorbs water in an amount of at least 20 times the weight of the resin and has particle size of 400 μm or less, and 1-50 parts by weight of a water-soluble resin per 100 parts by weight of the elastomer.
Claim 2
Dependent Claim
75 words
A water-swellable elastomer composition consisting essentially of a homogeneous mixture of an elastomer 5-300 parts by weight of a water-absorbent resin per 100 parts by weight of the elastomer and wherein said water-absorbent resin absorbs water in an amount of at least 20 times the weight of the resin and has particle size of 400 μm or less, and 1-50 parts by weight of a water-soluble resin per 100 parts by weight of the elastomer.
Claim 3
Dependent Claim
18 words
The composition of claim 1 wherein the particle size of said water-soluble resin is 100 μm or less.
Claim 4
Dependent Claim
36 words
A composition according to claim 1, wherein the amounts of the water-absorbent resin and the water-soluble resin are, respectively, 10-200 parts by weight and 1-50 parts by weight per 100 parts by weight of the elastomer.
Claim 5
Dependent Claim
49 words
A composition according to claim 1, wherein the elastomer is a chloroprene rubber, a butadiene rubber, a styrene-butadiene rubber, an acrylonitrile-butadiene rubber, an isobutylene-isoprene rubber, a fluororubber, an ethylene-propylene rubber, a chlorosulfonated polyethylene, a silicone rubber, an urethane rubber, a polysulfide rubber, an acrylic rubber or a natural rubber.
Claim 6
Dependent Claim
13 words
A composition according to claim 1, wherein the elastomer is a chloroprene rubber.
Claim 7
Dependent Claim
13 words
A composition according to claim 1, wherein the elastomer is a styrene-butadiene rubber.
Claim 8
Dependent Claim
62 words
A composition according to claim 1, wherein the water-absorbent resin is a crosslinked product of polyacrylate, a crosslinked product of starch-acrylate graft copolymer, a crosslinked product of hydrolyzate of startch-acrylonitrile graft copolymer, a crosslinked product of carboxymethylcellulose, a crosslinked product of polyvinyl alcohol, a crosslinked product of hydrolyzate of methyl (meth)acrylate-vinyl acetate copolymer or a crosslinked product of cellulose-sodium acrylate graft copolymer.
Claim 9
Dependent Claim
16 words
A composition according to claim 1, wherein the water-absorbent resin is a crosslinked product of polyacrylate.
Claim 10
Dependent Claim
18 words
A composition according to claim 1, wherein the water-absorbent resin is a crosslinked product of starch-acrylate graft copolymer.
Claim 11
Dependent Claim
21 words
A composition according to claim 1, wherein the water-soluble resin is a polyethylene oxide, a polyvinylpyrrolidone, a hydroxyethylcellulose or a hydroxypropylcellulose.
Claim 12
Dependent Claim
14 words
A composition according to claim 1, wherein the water-soluble resin is a polyethylene oxide.
Claim 13
Dependent Claim
14 words
A composition according to claim 1, wherein the water-soluble resin is a polyvinyl pyrrolidone.
Claim 14
Dependent Claim
26 words
A composition according to claim 1, wherein the water-absorbent resin is in the form of a powder having a particle diameter of 100 μm or less.
Claim 15
Dependent Claim
20 words
A composition according to claim 1, wherein the water-absorbent resin and the water-soluble resin are homogeneously dispersed in the elastomer.
Claim 16
Dependent Claim
33 words
A composition according to claim 1, wherein the water-absorbent resin is a water-absorbent resin having previously absorbed therein 10-100 parts by weight of water per 100 parts by weight of the water-absorbent resin.
References Cited (Backward Citations)
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US4277582A
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US4476276A
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JPS5633032A
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US4367297A
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JPS57190065A
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