US3873487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substantially water-insoluble polymeric soil conditioner for improving the physical structure of soils
Assignee: Japan Exlan Co Ltd
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Filing: 1973-03-30
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Granted: 1975-03-25
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Expires: 1993-03-30
Abstract
Abstract A soil conditioner consisting substantially of a water-swellable or water-insoluble polymer obtained by flocculating an initial reaction product of a water-soluble polymer containing acid groups and trivalent or higher valent polycations with each other with an anionic high molecular weight flocculant, which is applied to soil to improve the water-retentivity and fertilizerretentivity.
Inventors
- 👤 Takashi Minato
- 👤 Shinsuke Takegami
- 👤 Soichiro Kishimoto
- 👤 Katsutoshi Kanetsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:12
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; C; C08; C08L; C08L33/00; C08L33/02; C08L79/00; C08L79/02; Y; Y10; Y10S; Y10S71/00; Y10S71/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
A SOIL CONDITIONER ESSENTIALLY OF A WATERSWELLABLE OR WATER-INSOLUBLE POLYMER OBTAINED BY A. ADDING A TRIVALENT OR HIGHER VALENT POLYCATION TO AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SYNTHETIC POLYMER CONTAINING AN ACID GROUP AND HAVING A MOLECULAR WEIGHT OF AT LEAST 500 TO PRODUCE AN INITIAL REACTION PRODUCT OF THE POLYMER AND POLYCATION, SAID WATER-SOLUBLE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF A HOMO- OR CO-POLYMER OF AN ACID GROUP-CONTAINING UNSATURATED MONOMER, A COPOLYMER OF AN ACID GROUP-CONTAINING UNSATURATED MONOMER AND ANOTHER NEUTRAL ETHYLENICALLY UNSATURATED MONOMER AND A HYDROLYZED HOMO- OR COPOLYMER OF AN UNSATURATED MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, ACRYLAMIDE, MALEATE AND ACRYLATE, AND, B. THEN FLOCCULATING SAID INITIAL REACTION PRODUCT WITH AN ANIONIC HIGH MOLECULAR WEIGHT FLOCCULANT, SAID FLOCCULANT BEING A SYNTHETIC ORGANIC POLYMER HAVING A MOLECULAR WEIGHT OF ABOUT 500,000 TO 10,000,000 CONTAINING CARBOXYL GROUPS OR SULFONIC ACID GROUPS AND SALTS THEREF AS THE ANIONIC MOIETY.
Claim 2
Dependent Claim
153 words
A SOIL CONDITIONER ESSENTIALLY OF A WATERSWELLABLE OR WATER-INSOLUBLE POLYMER OBTAINED BY A. ADDING A TRIVALENT OR HIGHER VALENT POLYCATION TO AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SYNTHETIC POLYMER CONTAINING AN ACID GROUP AND HAVING A MOLECULAR WEIGHT OF AT LEAST 500 TO PRODUCE AN INITIAL REACTION PRODUCT OF THE POLYMER AND POLYCATION, SAID WATER-SOLUBLE POLYMER BEING SELECTED FROM THE GROUP CONSISTING OF A HOMO- OR CO-POLYMER OF AN ACID GROUP-CONTAINING UNSATURATED MONOMER, A COPOLYMER OF AN ACID GROUP-CONTAINING UNSATURATED MONOMER AND ANOTHER NEUTRAL ETHYLENICALLY UNSATURATED MONOMER AND A HYDROLYZED HOMO- OR COPOLYMER OF AN UNSATURATED MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLONITRILE, ACRYLAMIDE, MALEATE AND ACRYLATE, AND, B. THEN FLOCCULATING SAID INITIAL REACTION PRODUCT WITH AN ANIONIC HIGH MOLECULAR WEIGHT FLOCCULANT, SAID FLOCCULANT BEING A SYNTHETIC ORGANIC POLYMER HAVING A MOLECULAR WEIGHT OF ABOUT 500,000 TO 10,000,000 CONTAINING CARBOXYL GROUPS OR SULFONIC ACID GROUPS AND SALTS THEREF AS THE ANIONIC MOIETY.
Claim 3
Dependent Claim
15 words
A soil conditioner according to claim 1 wherein said water-soluble synthetic polymer is sodium polyacrylate.
Claim 4
Dependent Claim
20 words
A soil Conditioner according to claim 1 wherein said water-soluble synthetic polymer is a copolymer of acrylamide and sodium acrylate.
Claim 5
Dependent Claim
22 words
A soil conditioner according to claim 1 wherein said water-soluble synthetic polymer is a hydrolyzed copolymer consisting of acrylonitrile and methyl acrylate.
Claim 6
Dependent Claim
20 words
A soil conditioner according to claim 1 wherein said water-soluble synthetic polymer is an acrylonitrile copolymer containing an acid group.
Claim 7
Dependent Claim
33 words
A soil conditioner according to claim 1 wherein said trivalent or higher valent polycation is at least one metallic cation selected from a group consisting of an aluminum ion and a ferric ion.
Claim 8
Dependent Claim
40 words
A soil conditioner according to claim 6 wherein said metallic cation is added in the form of a compound selected from a group consisting of a hydroxide, sulfate, nitrate, chloride and carbonate into the aqueous solution of the water-soluble polymer.
Claim 9
Dependent Claim
22 words
A soil conditioner according to claim 1 wherein said trivalent or higher valent polycation is a synthetic vinyl polymer containing basic groups.
Claim 10
Dependent Claim
17 words
A soil conditioner according to claim 1 wherein said trivalent or higher valent cation is a polyethyleneimine.
Claim 11
Dependent Claim
29 words
A soil conditioner according to claim 1 wherein said anionic high molecular flocculant is added in amounts of 0.1 to 10 percent by weight of the initial reaction product.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |