EP0072569A2
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Water absorbing composite
Assignee: Kuraray Co Ltd
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Filing: 1982-08-17
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Granted: —
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Expires: 2002-08-17
Abstract
Abstract A water absorbing composite comprises an inorganic powder, and a highly absorbent resin covering the whole surfaces of the individual particles of the inorganic powder. The resin is obtained by reacting with a basic substance a polymer containing as a monomeric constituent an a,p-unsaturated compound having in its molecule one or two carboxyl groups, or one or two other groups convertible to a carboxyl group or groups, and by crosslinking the reaction product with a polyamine. The composite is useful as a water retaining agent for agriculture and horticulture, or as a dehydrating agent for oil.
Inventors
- 👤 Tetsuo Murakami
- 👤 Hirotoshi Miyazaki
- 👤 Hiroshi Harima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 05:08
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/02; B01J20/04; B01J20/043; B01J20/045; B01J20/10; B01J20/103; B01J20/106; B01J20/12; B01J20/22; B01J20/26; B01J20/264; B01J20/265; B01J20/267; B01J20/3092; B01J20/3214; B01J20/3223; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/3276; B01J20/328; B01J20/3282; C; C08; C08F; C08F8/00; C08F8/44; C09; C09K; C09K17/00; C09K17/40; C09K17/42; C10; C10G; C10G33/00; C10G33/04; B01J2220/00; B01J2220/40; B01J2220/46; B01J2220/50; B01J2220/58; C08F2800/00; C08F2800/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A water absorbing composite comprising: a water-insoluble inorganic powder; and a highly absorbent resin covering the whole surfaces of the individual particles of said powder, said resin being obtained by reacting with a basic substance a polymer containing as a monomeric constituent at least 40 mol % of an a,S-unsaturated compound having in its molecule one or two carboxyl groups, or one or two other groups convertible to a carboxyl group or groups, and by crosslinking the reaction product with a polyamine.
Claim 2
Dependent Claim
82 words
A water absorbing composite comprising: a water-insoluble inorganic powder; and a highly absorbent resin covering the whole surfaces of the individual particles of said powder, said resin being obtained by reacting with a basic substance a polymer containing as a monomeric constituent at least 40 mol % of an a,S-unsaturated compound having in its molecule one or two carboxyl groups, or one or two other groups convertible to a carboxyl group or groups, and by crosslinking the reaction product with a polyamine.
Claim 3
Dependent Claim
43 words
A composite as set forth in claim 1, wherein said inorganic powder is the powder of at least one inorganic substance selected from the group consisting of white carbon, magnesium carbonate, magnesium silicate, calcium carbonate, clay, talc, vermiculite, pearlite, barium sulfate and mica.
Claim 4
Dependent Claim
34 words
A composite as set forth in claim 1, wherein said polymer is a maleic acid copolymer, especially a copolymer of an a-olefin and maleic anhydride, or an alternating copolymer of isobutylene and maleic anhydride.
Claim 5
Dependent Claim
45 words
A composite as set forth in claim 3, wherein said copolymer is a maleic acid copolymer composed of at least one kind of monomer selected from the group consisting of styrene, vinyl acetate, methyl vinyl ether, acrylic ester, methacrylic ester and acrylonitrile, and maleic anhydride.
Claim 6
Dependent Claim
19 words
A composite as set forth in claim 1, wherein said polymer is an acrylic polymer, especially a polyacrylic acid.
Claim 7
Dependent Claim
22 words
A composite as set forth in any of the claims 1 to 5, wherein said basic substance is an alkali metal hydroxide.
Claim 8
Dependent Claim
31 words
7 . A composite as set forth in claim 3 or 7, wherein said polyamine is an amine of the general formula: where n is an integer of at least 1.
Claim 9
Dependent Claim
37 words
A composite as set forth in claim 1, wherein said highly absorbent resin has a power of absorbing from 20 to 1,000 times of its own weight, especially from 20 to 800 times of its own weight.
Claim 10
Dependent Claim
34 words
A composite as set forth in claim 1, wherein the said composite contains from 3 to 500 parts by weight of the highly absorbent resin for 100 parts by weight of the inorganic powder.
Claim 11
Dependent Claim
33 words
A composite as set forth in claim 1, wherein a substantially equal water absorbing power is maintained for at least twelve months at a temperature of 70°C when said composite has absorbed water.
Claim 12
Dependent Claim
29 words
The use of a composite according to any of the claims 1 to 10 as water retaining agent for agriculture and horticulture or as a dehydrating agent for oil.
References Cited (Backward Citations)
No citation records indexed.
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