US4402725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fertilizers
Assignee: Bayer AG
•
Filing: 1981-03-06
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Granted: 1983-09-06
•
Expires: 2001-03-06
Abstract
Abstract A fertilizer for the long term and uniform supply of plants with nutrient ions comprising a covalently crosslinked hydrogel in which are embedded ion exchangers which are laden with plant nutrients; furthermore a process for the long term and uniform supply of plants with nutrient ions wherein a covalently crosslinked hydrogel in which are embedded ion exchangers which are laden with plant nutrients is applied to the plants or their environment.
Inventors
- 👤 Harold Heller
- 👤 Dietmar Schapel
- 👤 Claus Hentschel
- 👤 Manfred Dahm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
C; C05; C05D; C05D9/00; Y; Y10; Y10S; Y10S71/00; Y10S71/02; Y10S71/903; Y10S71/904
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
53 words
A fertiliser based on a hydrogel containing plant nutrients comprising a covalently crosslinked polyurethane-polyurea containing hydrogel or a modified polyurethane-polyurea containing hydrogel in which are embedded ion exchangers which are laden with plant nutrients, said polyurethane-polyurea prepared from a reaction mixture comprising prepolymer and/or semi-prepolymer gel-forming substances containing isocyanate groups, and cross-linking agents.
Claim 2
Dependent Claim
53 words
A fertiliser based on a hydrogel containing plant nutrients comprising a covalently crosslinked polyurethane-polyurea containing hydrogel or a modified polyurethane-polyurea containing hydrogel in which are embedded ion exchangers which are laden with plant nutrients, said polyurethane-polyurea prepared from a reaction mixture comprising prepolymer and/or semi-prepolymer gel-forming substances containing isocyanate groups, and cross-linking agents.
Claim 3
Dependent Claim
20 words
The fertiliser according to claim 1 wherein the ratio of plant nutrient-laden ion exchanger to hydrogel is 10:90 to 90:10.
Claim 4
Dependent Claim
20 words
The fertiliser according to claim 1 wherein the ratio of plant nutrient-laden ion exchanger to hydrogel is 30:70 to 70:30.
Claim 5
Dependent Claim
32 words
The fertiliser according to claim 1 wherein the content of said polyurethane-polyurea or modified polyurethane-polurea in the hydrogel is at least 5% by weight relative to the total weight of the hydrogel.
Claim 6
Dependent Claim
32 words
The fertiliser according to claim 1 wherein the content of said polyurethane-polyurea or modified polyurethane-polyurea in the hydrogel is 5 to 40% by weight relative to the total weight of the hydrogel.
Claim 7
Dependent Claim
27 words
The fertiliser according to claim 1 wherein the weight ratio of gel-forming substance to crosslinking agent in the said polyurethane-polyurea or modified polyurethane-polyurea is 1:0.01 to 0.5.
Claim 8
Dependent Claim
27 words
The fertiliser according to claim 1 wherein the weight ratio of gel-forming substance to crosslinking agent in the said polyurethane-polyurea or modified polyurethane-polyurea is 1:0.03 to 0.3.
Claim 9
Dependent Claim
32 words
The fertiliser according to claim 1 wherein the content of isocyanate groups in the prepolymer or semi-prepolymer is 2 to 10% by weight, relative to the weight of the prepolymer or semi-prepolymer.
Claim 10
Dependent Claim
30 words
The fertiliser according to claim 1 wherein the content of isocyanate groups in the prepolymer is 3 to 5% by weight, relative to the weight of the prepolymer or semi-prepolymer.
Claim 11
Dependent Claim
30 words
The fertiliser according to claim 1 wherein the ion exchangers laden with plant nutrients are mixtures of anion exchangers laden with nutrient anions and cation exchangers laden with nutrient cations.
Claim 12
Dependent Claim
30 words
The fertiliser according to claim 11 wherein the anion exchanger laden with nutrient anions is laden with anionic chelate complexes of micro-nutrient cations and with further macro-nutrient and micro-nutrient anions.
Claim 13
Dependent Claim
68 words
A process for the long term and uniform supply of plants with nutrient ions comprising applying to the plants or their environment as a fertiliser a covalently crosslinked polyurethane-polyurea containing hydrogel or a modified polyurethane-polyurea containing hydrogel in which are embedded ion exchangers which are laden with plant nutrients, said polyurethane-polyurea prepared from a reaction mixture comprising prepolymer and/or semi-prepolymer gel-forming substances containing isocyanate groups, and cross-linking agents.
Claim 14
Dependent Claim
68 words
A process for the long term and uniform supply of plants with nutrient ions comprising applying to the plants or their environment as a fertiliser a covalently crosslinked polyurethane-polyurea containing hydrogel or a modified polyurethane-polyurea containing hydrogel in which are embedded ion exchangers which are laden with plant nutrients, said polyurethane-polyurea prepared from a reaction mixture comprising prepolymer and/or semi-prepolymer gel-forming substances containing isocyanate groups, and cross-linking agents.
Claim 15
Dependent Claim
22 words
The process of claim 12 wherein in the fertiliser the ratio of plant nutrient-laden ion exchanger to hydrogel is 10:90 to 90:10.
Claim 16
Dependent Claim
22 words
The process of claim 12 wherein in the fertilizer the ratio of plant nutrient-laden ion exchanger to hydrogel is 30:70 to 70:30.
Claim 17
Dependent Claim
34 words
The process of claim 12 wherein in the fertilizer the content of said polyurethane-polyurea or modified polyurethane-polyurea in the hydrogel is 5 to 40% by weight relative to the total weight of the hydrogel.
Claim 18
Dependent Claim
28 words
The process of claim 12 wherein the fertilizer the weight ratio of gel-forming substance to crosslinking agent in the said polyurethane-polyurea or modified polyurethane-polyurea is 1:0.01 to 0.5.
Claim 19
Dependent Claim
29 words
The process of claim 12 wherein in the fertiliser the weight ratio of gel-forming substance to crosslinking agent in the said polyurethane-polyurea or modified polyurethane-polyurea is 1:0.03 to 0.3.
Claim 20
Dependent Claim
18 words
The process of claim 12 wherein in the fertiliser the covalently crosslinked hydrogel is a modified polyurethane-polyurea hydrogel.
Claim 21
Dependent Claim
34 words
Process according to claim 18 wherein in the fertiliser the content of isocyanate groups in the prepolymer or semi-prepolymer is 2 to 10% by weight, relative to the weight of the prepolymer or semi-prepolymer.
Claim 22
Dependent Claim
34 words
Process according to claim 18 wherein in the fertiliser the content of isocyanate groups in the prepolymer or semi-prepolymer is 3 to 5% by weight, relative to the weight of the prepolymer or semi-prepolymer.
Claim 23
Dependent Claim
32 words
The process of claim 12 wherein in the fertiliser the ion exchangers laden with plant nutrients are mixtures of anion exchangers laden with nutrient anions and cation exchangers laden with nutrient cations.
Claim 24
Dependent Claim
32 words
The process of claim 12 wherein in the fertiliser the anion exchanger laden with nutrient anions is laden with anionic chelate complexes of micro-nutrient cations and with further macro-nutrient and micro-nutrient anions.
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) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |